Vibration damping structure, and device incorporating the vibration damping structure

Abstract

To provide a vibration damping structure for performing a high vibration damping function, and a device incorporating the vibration damping structure.SOLUTION: This vibration damping structure comprises a first support member, a second support member, and one or more vibration damping units. One or more vibration damping units are connected between the first support member and the second support member, so as to restrain vibration in a first direction acting on the first support member and the second support member. Each of one or more vibration damping units includes a first vibration damping core unit connected to the first support member via a hinge, and a second vibration damping core unit connected to the second support member via a hinge. The first and second vibration damping core units are connected via hinges. Also, each of the first and second vibration damping core units has four rotation members, and each rotation members is connected to the other member via the hinge whose position when seen from the first direction is appropriately defined. The position of the hinge is appropriately defined, so that each rotation member can be rotated when the vibration in the first direction is applied.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration damping structure applicable to vibration damping and an apparatus incorporating the vibration damping structure.

Background Art

[0002] In daily life, vibrations occur very close at hand, for example, from vehicles such as trains and cars, vibrating tools such as chain saws and lawn mowers, and music instruments such as radios and musical instruments. For example, vibrations may be transmitted directly from vehicles or vibrating tools, or may be transmitted by sound waves.

[0003] Generally, the vibration frequency (frequency) transmitted through solids is said to be in the range of 20 to 1000 Hz, and for example, vibrations (physical effects) are generated on buildings, furniture, etc. Due to such vibrations, problems often occur such as the device being strongly shaken and broken, or misalignment occurring in fine operations such as printing and processing.

[0004] Vibrations often have a direct impact on the physical and mental health of humans as well as on objects and operations (physiological effects). For example, depending on the time period when vibrations occur, they can affect sleep, and if exposed to those vibrations for a long time, the psychological effects also become greater. Thus, vibrations are a major factor in the environment in human life, and suppressing vibrations is very important in creating a comfortable and trouble-free environment.

[0005] Examples of vibration damping methods include using a damping mechanism (vibration damping structure) such as a damper using a spring, or using a damping material such as sponge or rubber.

[0006] In recent years, research on members having a fine periodic structure with a directly controllable scale called metamaterials has been actively conducted. In such a metamaterial structure, it is possible to exhibit characteristics that cannot be exhibited only by the inherent characteristics of the material due to the fine periodic structure.

[0007] It is also being considered that such metamaterial structures can be used to control the propagation of sound waves and vibrations, and these are also called acoustic metamaterials. By changing the fine periodic structure, it becomes possible to absorb specific frequencies or attenuate the propagation of sound waves and vibrations.

[0008] Patent Document 1 discloses a vibration damping structure equipped with a dynamic vibration absorber. This dynamic vibration absorber is characterized by having a fine periodic structure having a rod-shaped support part extending from the frame at one end and a vibrating part connected to the other end of the support part and extending beyond the support part, thereby dispersing the resonant frequency of the object to be damped and suppressing the vibration energy.

[0009] Patent Document 2 discloses a sound-insulating material made of an acoustic metamaterial that can be placed in a partition wall and can be integrally molded. This sound-insulating material has a plurality of resonant parts including a weight portion, and vibrations are attenuated because the resonant parts generate vibrations different from the vibrations transmitted to the sound-insulating material. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2020-3059 [Patent Document 2] Japanese Patent Publication No. 2021-152584 [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] There is a need for vibration-damping structures that can exhibit such high vibration damping capabilities.

[0012] In view of the above circumstances, the object of the present invention is to provide a vibration damping structure capable of exhibiting high vibration damping function, and a device incorporating the vibration damping structure. [Means for solving the problem]

[0013] To achieve the above objective, a vibration damping structure according to one embodiment of the present invention comprises a first support member, a second support member, and one or more vibration damping units. The second support member is positioned opposite the first support member along the first direction. The one or more vibration damping units are connected between the first support member and the second support member, and suppress vibrations acting on the first support member and the second support member in the first direction. Furthermore, each of the one or more vibration damping units includes a first vibration damping core unit and a second vibration damping core unit. The first vibration damping core unit is A first rotating member connected to the first support member via a first hinge, A second rotating member connected to the first support member via a second hinge, A third rotating member is connected to the first rotating member via a third hinge positioned differently from the first hinge when viewed from the first direction, A fourth rotating member is connected to the second rotating member via a fourth hinge, which is positioned differently from the second hinge when viewed from the first direction. It holds. The second vibration damping core unit is A fifth rotating member connected to the second support member via a fifth hinge, A sixth rotating member connected to the second support member via a sixth hinge, A seventh rotating member is connected to the fifth rotating member via a seventh hinge, which is positioned differently from the fifth hinge when viewed from the first direction, When viewed from the first direction, the eighth rotating member is connected to the sixth rotating member via an eighth hinge which is positioned differently from the sixth hinge. It holds. The first vibration damping core unit and the second vibration damping core unit are, A ninth hinge, which is positioned differently from the third hinge when viewed from the first direction and connected to the third rotating member, A tenth hinge, which is positioned differently from the fourth hinge when viewed from the first direction and connected to the fourth rotating member, An eleventh hinge, which is positioned differently from the seventh hinge when viewed from the first direction and connected to the seventh rotating member, A 12th hinge, which is positioned differently from the 8th hinge when viewed from the first direction and connected to the 8th rotating member, They are connected to each other via [a certain mechanism].

[0014] In this vibration damping structure, one or more vibration damping units are connected between a first support member and a second support member. Each of the one or more vibration damping units includes a first vibration damping core unit and a second vibration damping core unit. The first vibration-damping core unit is connected to the first support member via the first and second hinges, and the second vibration-damping core unit is connected to the second support member via the fifth and sixth hinges. Furthermore, the first vibration-damping core unit and the second vibration-damping core unit are connected to each other via the ninth to twelfth hinges. The first vibration-damping core unit has first to fourth rotating members. Of these, the first rotating member and the third rotating member are connected to each other via a third hinge. The second rotating member and the fourth rotating member are also connected to each other via a fourth hinge. The second vibration-damping core unit has fifth to eighth rotating members. Of these, the fifth rotating member and the seventh rotating member are connected to each other via the seventh hinge. Also, the sixth rotating member and the eighth rotating member are connected to each other via the eighth hinge. The positions of the first to twelfth hinges are appropriately set when viewed from the first direction, as described above. When vibrations in the first direction act on the first support member and the second support member, each rotating member rotates about the hinge. The connection portion between the first vibration damping core unit and the second vibration damping core unit is displaced in a direction that cancels out the vibrations in the first direction acting on the first support member and the second support member. Thereby, it becomes possible to suppress the vibrations acting on the first support member and the second support member. As a result, it becomes possible to exhibit a high vibration damping function.

[0015] Each of the one or more vibration damping units may include a vibration damping drive member connected to the third rotating member via the ninth hinge, connected to the fourth rotating member via the tenth hinge, connected to the seventh rotating member via the eleventh hinge, and connected to the eighth rotating member via the twelfth hinge.

[0016] Regarding the displacement of the first support member and the second support member in the first direction to the first direction caused by the action of the vibration in the first direction as the first vibration displacement, and the displacement of the first support member and the second support member in the second direction opposite to the first direction in the first direction as the second vibration displacement, the first vibration damping core unit may be configured to be elastically deformed in the first direction in response to the first vibration displacement and to be compressed and deformed along the first direction in response to the second vibration displacement. In this case, the second vibration damping core unit may be configured to be compressed and deformed along the first direction in response to the first vibration displacement and to be elastically deformed along the first direction in response to the second vibration displacement.

[0017] The vibration damping drive member may be configured to be displaced in the second direction in response to the first vibration displacement and to be displaced in the first direction in response to the second vibration displacement.

[0018] Each of the one or more vibration damping units may have a resonance frequency set based on the frequency of the vibration in the first direction to be vibration-damped.

[0019] The frequency of the vibration in the direction 1 that is to be damped may be within the range of 20 Hz to 1000 Hz.

[0020] Each of the one or more vibration damping units may be connected between the first support member and the second support member with reference to a first connection reference position set on the first support member and a second connection reference position set on the second support member which is at the same position as the first connection reference position when viewed from the first direction.

[0021] Each of the one or more vibration damping units may be configured symmetrically with respect to a reference line extending in the first direction that connects the first connection reference position and the second connection reference position.

[0022] In each of the one or more vibration damping units, the first rotating member, the second rotating member, the third rotating member, and the fourth rotating member may be arranged symmetrically with respect to the center of the first vibration damping core unit. In this case, the fifth rotating member, the sixth rotating member, the seventh rotating member, and the eighth rotating member may be arranged symmetrically with respect to the center of the second vibration damping core unit.

[0023] When viewed from the first direction, the first hinge, the fifth hinge, the ninth hinge, and the eleventh hinge may be positioned in the same location. In this case, when viewed from the first direction, the second hinge, the sixth hinge, the tenth hinge, and the twelfth hinge may be positioned in the same location. Also, when viewed from the first direction, the third hinge and the seventh hinge may be positioned in the same location. Also, when viewed from the first direction, the fourth hinge and the eighth hinge may be positioned in the same location.

[0024] Each of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth hinges may be made of a thin-walled member that extends in the first direction and has a relatively small cross-sectional size perpendicular to the first direction.

[0025] Each of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth hinges may be set to a cross-sectional size perpendicular to the first direction, with reference to the frequency of the vibration in the first direction that is to be damped.

[0026] At least one of the first hinge, the second hinge, the third hinge, the fourth hinge, the fifth hinge, the sixth hinge, the seventh hinge, the eighth hinge, the ninth hinge, the tenth hinge, the eleventh hinge, and the twelfth hinge may have an R-chamfered portion at the connection point with other members.

[0027] The radius of the R-chamfered portion may be 1 mm or more.

[0028] Each of the one or more vibration damping units may be fitted with one or more weights.

[0029] The one or more weights may include a first weight positioned on the first rotating member of the first vibration-damping core unit, a second weight positioned on the second rotating member, a third weight positioned on the third rotating member, and a fourth weight positioned on the fourth rotating member, as well as a fifth weight positioned on the fifth rotating member of the second vibration-damping core unit, a sixth weight positioned on the sixth rotating member, a seventh weight positioned on the seventh rotating member, and an eighth weight positioned on the eighth rotating member.

[0030] The first, second, third, and fourth weights may be arranged symmetrically with respect to the center of the first vibration-damping core unit. In this case, the fourth, fifth, sixth, and seventh weights may be arranged symmetrically with respect to the center of the second vibration-damping core unit.

[0031] The number, weight, shape, and placement position of the one or more weights may be determined based on the frequency of the vibration in the first direction that is to be damped.

[0032] The vibration damping structure may further include reinforcing members connected between the first support member and the second support member so as to surround the one or more vibration damping units, thereby reinforcing the rigidity of the vibration damping structure.

[0033] A gap of at least 1 mm may be provided between each of the one or more vibration damping units and the reinforcing member.

[0034] The reinforcing member may include a pair of oblique frame members connected to either the first support member or the second support member, and extending obliquely with respect to the first direction so as to be symmetrical with respect to the reference line.

[0035] The reinforcing member may be constructed in the form of a truss structure.

[0036] The reinforcing member may be constructed by topology optimization.

[0037] The reinforcing member may be composed of a plate-shaped member positioned in the area surrounding the one or more vibration damping units between the first support member and the second support member.

[0038] The reinforcing member has a plurality of frame members, including a diagonal brace member extending diagonally with respect to the first direction, and an R-chamfered portion may be provided at least one of the connection portions between the first support member and the plurality of frame members, the connection portions between the second support member and the plurality of frame members, and the connection portions between the frame members included in the plurality of frame members.

[0039] The reinforcing member may have the R-chamfered portion formed at the connection point between the bracing members.

[0040] The reinforcing member may have a rounded chamfer at at least one of the following: the connection portion between the first support member and the plate-shaped member, the connection portion between the second support member and the plate-shaped member, and the corner portion formed on the end face of the plate-shaped member.

[0041] The reinforcing member may have the R-chamfered portion formed at the corner of the opposing surface facing each of the one or more vibration damping units.

[0042] The radius of the R-chamfered portion may be 2 mm or more.

[0043] The first vibration-damping core unit may have at least one of a first internal reinforcing member connecting the first rotating member and the second rotating member to each other, and a second internal reinforcing member connecting the third rotating member and the fourth rotating member to each other. In this case, the second vibration-damping core unit may have at least one of a third internal reinforcing member connecting the fifth rotating member and the sixth rotating member to each other, and a fourth internal reinforcing member connecting the seventh rotating member and the eighth rotating member to each other.

[0044] A vibration input point may be set at a predetermined position on the first support member.

[0045] A vibration output point may be set at a position on the first support member that is spaced apart from the vibration input point.

[0046] The one or more vibration damping units may be a plurality of vibration damping units arranged in a line along a second direction perpendicular to the first direction.

[0047] The vibration input point may be set at the position of one end of the first support member in the second direction.

[0048] The vibration input point may be set at the central position of the first support member in the second direction.

[0049] The vibration damping structure may be configured such that the first direction is aligned with the vertical direction, and the first support member is positioned above the second support member.

[0050] The vibration damping structure may be configured as a metamaterial structure.

[0051] An apparatus incorporating a vibration damping structure according to one embodiment of the present invention comprises one or more vibration damping structures connected between a first member and a second member. Each of the one or more vibration damping structures is the vibration damping structure described in claim 1, wherein the first support member is connected to the first member such that a predetermined position of the first support member becomes a first vibration application point, and the first support member is connected to the second member such that a position spaced apart from the first vibration application point becomes a second vibration application point.

[0052] The device incorporating the vibration damping structure may further include a first connection mechanism and a second connection mechanism. The first connecting mechanism connects the first member to each of the one or more vibration damping structures such that when vibration is generated from the first member in the first direction, the vibration generated from the first member is input to the first point of vibration application. The second connection mechanism connects the second member to each of the one or more vibration damping structures such that when vibration is generated from the second member in the first direction, the vibration generated from the second member is input to the second vibration application point.

[0053] Each of the one or more vibration damping structures may have a plurality of vibration damping units arranged in a line along a second direction perpendicular to the first direction, as one or more vibration damping units. In this case, each of the one or more vibration damping structures may be connected to the first member such that the position of one end of the first support member in the second direction becomes the first point of vibration application. Alternatively, each of the one or more vibration damping structures may be connected to the second member such that the position of the other end of the first support member in the second direction becomes the second point of vibration application.

[0054] The one or more vibration damping structures may be a plurality of vibration damping structures arranged along a third direction perpendicular to each of the first and second directions, and such that when viewed from the third direction, the positions of the two ends in the second direction are aligned. In this case, the plurality of vibration damping structures may be arranged alternately along the third direction, with a first vibration damping structure connected to a first member such that the position of the first side end becomes the first point of vibration application when viewed from the third direction, and a second vibration damping structure connected to a second member such that the position of the second side end becomes the first point of vibration application, and a second vibration damping structure connected to a first member such that the position of the second side end becomes the first point of vibration application, and a second member such that the position of the first side end becomes the second point of vibration application.

[0055] Each of the one or more vibration damping structures may have a plurality of vibration damping units arranged in a line along a second direction perpendicular to the first direction, as one or more vibration damping units. In this case, each of the one or more vibration damping structures may be connected to the first member such that the central position of the first support member in the second direction becomes the first point of vibration application. Alternatively, each of the one or more vibration damping structures may be connected to the second support member such that the position of at least one end of the first member in the second direction becomes the second point of vibration application. [Effects of the Invention]

[0056] As described above, the present invention makes it possible to achieve high vibration damping functionality. However, the effects described herein are not necessarily limited, and any of the effects described in this disclosure may be present. [Brief explanation of the drawing]

[0057] [Figure 1] This is a schematic diagram of a vibration damping structure according to one embodiment of the present invention, viewed along the depth direction (Y direction). [Figure 2] This diagram illustrates a portion of the vibration damping structure shown in Figure 1. [Figure 3] This is a schematic diagram showing the vibration damping unit located at the far left of the three vibration damping units. [Figure 4] This is a schematic diagram illustrating how vibrations in the vertical direction (Z direction) are damped by a vibration damping structure (first vibration displacement). [Figure 5] This is a schematic diagram showing how vibration damping units reduce vibrations in the vertical direction (Z direction) (second vibration displacement). [Figure 6] This is a schematic diagram illustrating how vibrations in the vertical direction (Z direction) are damped by a vibration damping structure (first vibration displacement). [Figure 7] This is a schematic diagram showing how vibrations in the vertical direction (Z direction) are dampened by the vibration unit (second vibration displacement). [Figure 8] This is a schematic diagram showing an example of weight placement relative to a vibration damping unit. [Figure 9] This is a schematic diagram showing an example of weight placement relative to a vibration damping unit. [Figure 10] This is a schematic diagram showing an example of weight placement relative to a vibration damping unit. [Figure 11] Figures 8 to 10 show graphs illustrating the vibration damping with respect to frequency of vertical (Z-direction) vibrations when using the vibration damping units shown. [Figure 12] This is a schematic diagram showing other examples of weight placement relative to the vibration damping unit. [Figure 13]This is a schematic diagram showing other examples of weight placement relative to the vibration damping unit. [Figure 14] This is a schematic diagram showing other examples of weight placement relative to the vibration damping unit. [Figure 15] This is a schematic diagram showing other examples of weight placement relative to the vibration damping unit. [Figure 16] This graph shows the vibration damping with respect to the vibration frequency in the vertical direction (Z direction) when the size of the 1st to 12th hinges is changed in the horizontal direction (X direction). [Figure 17] This is a schematic diagram showing other configuration examples of reinforcing members. [Figure 18] This is a schematic diagram showing other configuration examples of reinforcing members. [Figure 19] This is a schematic diagram showing other configuration examples of vibration damping units. [Figure 20] This is a schematic diagram showing other configuration examples of reinforcing members. [Figure 21] This is a schematic diagram showing other configuration examples of reinforcing members. [Figure 22] This is a schematic diagram showing a general configuration example of a vibration damping device according to one embodiment of the present invention. [Figure 23] This is a schematic diagram (perspective view) showing another example of a vibration damping device configuration. [Figure 24] This is a schematic diagram (front view) showing another example of a vibration damping device configuration. [Figure 25] This is a schematic diagram (side view) showing another example of a vibration damping device configuration. [Figure 26] This is a schematic diagram (front view) showing another example of a vibration damping device configuration. [Figure 27] This is a schematic diagram showing an example of the installation of multiple vibration damping devices. [Figure 28] This is a schematic diagram showing other configuration examples of vibration damping structures. [Figure 29] This is a schematic diagram showing other configuration examples of vibration damping structures. [Figure 30] This is a schematic diagram showing other configuration examples of vibration damping structures. [Figure 31] This is a magnified view showing a close-up of the third hinge section. [Modes for carrying out the invention]

[0058] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0059] [Configuration of vibration damping structure] Referring to Figures 1 to 3, the configuration of a vibration damping structure according to one embodiment of the present invention will be described. The vibration damping structure can also be called a vibration damping mechanism.

[0060] To facilitate understanding of the following explanation, the left-right, depth, and up-down directions will be conveniently defined for vibration damping structure 1. Specifically, the X direction in the diagram will be the left-right direction (the positive side of the X axis is the right side, and the negative side is the left side), and the Y direction in the diagram will be the depth direction (the positive side of the Y axis is the back side, and the negative side is the front side). The Z direction in the diagram will be the up-down direction (the positive side of the Z axis is the up side, and the negative side is the down side).

[0061] Of course, the application of this technology is not limited to the orientation in which the vibration damping structure 1 is positioned. Nor is it limited to which parts of the vibration damping structure 1 are considered the front side and which parts are considered the side side.

[0062] Figure 1 is a schematic diagram of the vibration damping structure 1 as viewed from the depth direction (Y direction). Figure 2 is a diagram illustrating only specific parts of the vibration damping structure 1 shown in Figure 1. Specifically, Figure 2 shows the first support member 2, the second support member 3, and the three vibration damping units 4 (4a to 4c) of the vibration damping structure 1. Figure 3 is a schematic diagram showing the vibration damping unit 4a located at the leftmost end of the three vibration damping units 4.

[0063] In this embodiment, the vertical direction (Z direction) corresponds to one embodiment of the first direction according to this technology. The left-right direction (X direction) corresponds to one embodiment of the second direction which is orthogonal to the first direction. The depth direction (Y direction) corresponds to one embodiment of the third direction which is orthogonal to both the first and second directions. The three vibration damping units 4a to 4c correspond to one or more embodiments of vibration damping units related to this technology.

[0064] As shown in Figures 1 and 2, the vibration damping structure 1 includes a first support member 2, a second support member 3, three vibration damping units 4a to 4c, a reinforcing member 5, an upper skin member 6, and a lower skin member 7. The first support member 2 is a plate-shaped member that extends in the X direction. The second support member 3 is a plate-shaped member that extends in the X direction with the same length as the first support member 2, and is positioned opposite the first support member 2 along the Z direction. The first support member 2 and the second support member 3 have the same shape as each other.

[0065] The first support member 2 and the second support member 3 are configured such that equal plate-shaped members are arranged facing each other along the Z direction and parallel to each other along the X direction.

[0066] The size (thickness) of the first support member 2 and the second support member 3 in the depth direction (Y direction) is not limited and can be designed arbitrarily. In this embodiment, the vibration damping structure 1 shown in Figure 1 is constructed with a thickness of about 1 / 8 of its size in the vertical direction (Z direction). Therefore, the approximate outer shape of the vibration damping structure 1 is that of a plate-shaped member.

[0067] This is not the only option; the thickness of the vibration damping structure 1 (size in the Y direction) can also be designed to be approximately the same as its size in the vertical direction (Z direction). In this case, the approximate outer shape of the vibration damping structure 1 will be a rectangular parallelepiped (block shape).

[0068] The three vibration damping units 4a to 4c are positioned between the first support member 2 and the second support member 3, and suppress vertical (Z-direction) vibrations acting on the first support member 2 and the second support member 3. For example, suppose that the first support member 2 and the second support member 3 vibrate at a predetermined frequency along the vertical direction (Z direction) due to an external force or the like. The three vibration damping units 4a to 4c can deform in response to the vertical vibration (Z direction) of the first support member 2 and the second support member 3, and can dampen the vertical vibration (Z direction).

[0069] In this embodiment, the thickness (size in the Y direction) of the three vibration damping units 4a to 4c is designed to be the same as the thickness of the first support member 2 and the second support member 3. Of course, the thickness of the vibration damping unit 4 may be designed to be different from the thickness of the first support member 2 and the second support member 3.

[0070] The reinforcing member 5 is connected between the first support member 2 and the second support member 3, surrounding the three vibration damping units 4a to 4c, thereby reinforcing the rigidity of the vibration damping structure 1. The reinforcing member 5 can also be referred to as the outer wall. As shown in Figures 1 and 3, in this embodiment, the reinforcing member 5 is constructed as a truss structure. A truss structure is a type of structural form based on structural mechanics, and it is a structure that reduces stress caused by external forces by forming triangles in the structure.

[0071] In this embodiment, the thickness (size in the Y direction) of the reinforcing member 5 is designed to be the same as that of the first support member 2 and the second support member 3. Of course, the thickness of the reinforcing member 5 may also be designed to be different from that of the first support member 2 and the second support member 3. For example, it is possible to design the first support member 2, the second support member 3, the vibration damping unit 4, and the reinforcing member 5 to have different thicknesses.

[0072] The upper skin member 6 is made of a plate-shaped member and is connected to the upper side of the first support member 2. The lower skin member 7 is made of a plate-shaped member and is connected to the lower side of the second support member 3. By attaching the upper skin member 6 and the lower skin member 7 to the upper and lower parts of the vibration damping structure 1, the rigidity of the vibration damping structure 1 can be reinforced.

[0073] [First support member 2 and second support member 3] As shown in Figures 1 and 2, in this embodiment, the position of the left end 2a of the first support member 2 and the position of the left end 3a of the second support member 3 are aligned in the left-right direction (X direction). Also, in the X direction, the position of the right end 2b of the first support member 2 and the position of the right end 3b of the second support member 3 are aligned.

[0074] When the vibration damping structure 1 is viewed from the vertical direction (Z direction), the left end 2a of the first support member 2 and the left end 3a of the second support member 3 are at the same position. Also, when viewed from the vertical direction (Z direction), the right end 2b of the first support member 2 and the right end 3b of the second support member 3 are at the same position.

[0075] The first support member 2 is provided with three first connection reference positions 9 (9a to 9c) that serve as a reference when connecting the three vibration damping units 4a to 4c. In this embodiment, the first connection reference positions 9a to 9c are set to be equally spaced from the left end 2a of the first support member 2.

[0076] The first connection reference position 9a, located at the far left end, serves as the reference position for connecting the vibration damping unit 4a, also located at the far left end. The first connection reference position 9b, located in the center, serves as the reference position for connecting the vibration damping unit 4b, also located in the center. The first connection reference position 9c, located at the far right end, serves as the reference position for connecting the vibration damping unit 4c, also located at the far right end.

[0077] In this disclosure, "connection" between components is not limited to direct connection to the components to be connected, but also includes connection via other physical components. For example, the connection between component A and component B includes a form in which component A and component B are connected via other components such as a hinge. In other words, it includes connection forms in which other components such as a hinge are interposed between component A and component B. Furthermore, "connection" includes not only forms in which components are fixed to each other via adhesives, screws, etc., but also contact and abutment between components, such as when one component is placed on top of another component.

[0078] The second support member 3 is provided with three second connection reference positions 10 (10a to 10c) that serve as a reference when connecting the three vibration damping units 4a to 4c. In this embodiment, the second connection reference positions 10a to 10c are set to be equally spaced from the left end 3a of the second support member 3.

[0079] The second connection reference position 10a, located at the far left end, serves as the reference position for connecting the vibration damping unit 4a, also located at the far left end. The second connection reference position 10b, located in the center, serves as the reference position for connecting the vibration damping unit 4b, also located in the center. The first connection reference position 10c, located at the far right end, serves as the reference position for connecting the vibration damping unit 4c, also located at the far right end.

[0080] As shown in Figures 1 to 3, in the left-right direction (X direction), the first connection reference position 9a and the second connection reference position 10a are at the same position. Also, in the left-right direction (X direction), the first connection reference position 9b and the second connection reference position 10b are at the same position. In the left-right direction (X direction), the first connection reference position 9c and the second connection reference position 10c are at the same position.

[0081] When the vibration damping structure 1 is viewed from the vertical direction (Z direction), each pair of (first connection reference position 9a, second connection reference position 10a), (first connection reference position 9b, second connection reference position 10b), and (first connection reference position 9c, second connection reference position 10c) are at the same position as each other.

[0082] As shown in Figures 1 to 3, the virtual lines connecting each pair of (first connection reference position 9a, second connection reference position 10a), (first connection reference position 9b, second connection reference position 10b), and (first connection reference position 9c, second connection reference position 10c) are called reference lines RLa to RLc. Each of the reference lines RLa to RLc is a line that extends in the vertical direction (Z direction).

[0083] [Three vibration damping units 4a~4c] As shown in Figures 1 and 2, the three vibration damping units 4a to 4c are arranged side by side in the left-right direction (X direction) perpendicular to the vertical direction (Z direction). In this embodiment, the three vibration damping units 4a to 4c have the same shape as each other. Hereinafter, the vibration damping unit 4a, located at the leftmost end, will be described as a representative of the three vibration damping units 4a to 4c. The description of vibration damping unit 4a below also applies to each of the three vibration damping units 4a to 4c.

[0084] As shown in Figures 2 and 3, in this embodiment, the vibration damping unit 4a is configured to be symmetrical with respect to the reference line RLa. That is, the vibration damping unit 4a is configured to be symmetrical with respect to the reference line RLa.

[0085] As shown in Figures 2 and 3, the vibration damping unit 4a includes a first vibration damping core unit 12, a second vibration damping core unit 13, and a vibration damping drive member 14.

[0086] The first vibration damping core unit 12 and the second vibration damping core unit 13 have the same shape as each other. The vibration damping drive member 14 is positioned between the first vibration damping core unit 12 and the second vibration damping core unit 13 and is connected to each of the first vibration damping core unit 12 and the second vibration damping core unit 13. As shown in Figures 1 to 3, the vibration damping drive member 14 is positioned at the center of the vibration damping structure 1 in the vertical direction (Z direction) (the position of the virtual center line CL).

[0087] [First vibration damping core unit 12] As shown in Figure 3, the first vibration damping core unit 12 has an approximate rhombus shape when viewed from the depth direction (Y direction), with the vertical direction (Z direction) as the long axis and the horizontal direction (X direction) as the short axis. The first vibration damping core unit 12 is also composed of four rotating members 15 (the first to fourth rotating members 15a to 15d). The first to fourth rotating members 15a to 15d are arranged symmetrically with respect to the center CP1 of the first vibration damping core unit 12.

[0088] As shown in Figure 3, each of the first to fourth rotating members 15a to 15d has an approximate outer shape that is close to a trapezoid when viewed from the depth direction (Y direction). Each of the first to fourth rotating members 15a to 15d has the same shape as the others, and their orientations in the up, down, left, and right directions are set as appropriate, and they are arranged symmetrically with respect to the center CP1.

[0089] As shown in Figure 3, the first rotating member 15a is positioned in the upper right when viewed from the depth direction (Y direction). The first rotating member 15a has a first side portion 16a-1 extending in the left-right direction (X direction) and a second side portion 16b-1 that also extends in the left-right direction (X direction) and faces the first side portion 16a-1 along the vertical direction (Z direction). The first side portion 16a-1 is the upper side portion of the first vibration damping core unit 12.

[0090] The first side 16a-1 and the second side 16b-1 are positioned such that their left ends are in the same position in the left-right direction (X direction). The right end of the second side 16b-1 is located to the right of the right end of the first side 16a-1.

[0091] The first rotating member 15a also has a third side portion 16c-1 that extends along the vertical direction (Z direction) and connects the left end of the first side portion 16a-1 with the left end of the second side portion 16b-1. The first rotating member 15a also has a fourth side portion 16d-1 that connects the right end of the first side portion 16a-1 with the right end of the second side portion 16b-1 and extends diagonally to the lower right.

[0092] When the first rotating member 15a is viewed along the depth direction (Y direction), the first side 16a-1 corresponds to the top side of the trapezoid, and the second side 16b-1 corresponds to the bottom side. The third side 16c-1 corresponds to the left side of the trapezoid, and the fourth side 16d-1 corresponds to the right side.

[0093] The second rotating member 15b has the same configuration as the first rotating member 15a when its left and right sides are reversed and it is translated to the left.

[0094] The first side portion 16a-2 of the second rotating member 15b extends in the left-right direction (X direction) and is located in the same straight line as the first side portion 16a-1 of the first rotating member 15a. Therefore, the first side portion 16a-2 of the second rotating member 15b also becomes the upper side portion of the first vibration damping core unit 12. The second side portion 16b-2 of the second rotating member 15b extends in the left-right direction (X direction) and is located in the same straight line as the second side portion 16b-1 of the first rotating member 15a.

[0095] The third edge portion 16c-2 of the second rotating member 15b extends in the vertical direction (Z direction) and is positioned opposite the third edge portion 16c-1 of the first rotating member 15 with a predetermined distance (clearance) between them along the left-right direction (X direction). The third side 16c-2 is positioned symmetrically to the third side 16c-1 with respect to the reference line Rla. Therefore, in the left-right direction (X direction), the distance from the third side 16c-1 to the reference line RLa and the distance from the third side 16c-2 to the reference line RLa are equal.

[0096] The fourth side portion 16d-2 of the second rotating member 15b connects the left end of the first side portion 16a-2 and the left end of the second side portion 16b-2, and extends diagonally downward to the left.

[0097] When the second rotating member 15b is viewed along the depth direction (Y direction), the first side portion 16a-2 corresponds to the top side of the trapezoid, and the second side portion 16b-2 corresponds to the bottom side. The third side portion 16c-2 corresponds to the right side of the trapezoid, and the fourth side portion 16d-2 corresponds to the left side.

[0098] The third rotating member 15c has the same configuration as when the first rotating member 15a is inverted vertically and moved parallel to the downward side.

[0099] The first edge portion 16a-3 of the third rotating member 15c extends in the left-right direction (X direction) and forms the lower edge portion of the first vibration damping core unit 12. The second edge portion 16b-3 of the third rotating member 15c extends in the left-right direction (X direction) and is positioned opposite the second edge portion 16b-1 of the first rotating member 15a at a predetermined distance apart along the up-down direction (Z direction). The second side portion 16b-3 is positioned symmetrically to the second side portion 16b-1 with respect to a hypothetical line (not shown in the diagram) that extends in the left-right direction (X direction) through the center CP1 of the first vibration-damping core unit 12.

[0100] The third side portion 16c-3 of the third rotating member 15c extends in the vertical direction (Z direction) and is located in the same straight line as the third side portion 16c-1 of the first rotating member 15a. The fourth side portion 16d-3 of the third rotating member 15c connects the right end of the first side portion 16a-3 and the right end of the second side portion 16b-3 and extends diagonally to the upper right.

[0101] When the third rotating member 15c is viewed along the depth direction (Y direction), the first side portion 16a-3 corresponds to the bottom side of the trapezoid, and the second side portion 16b-3 corresponds to the top side. The third side portion 16c-3 corresponds to the left side of the trapezoid, and the fourth side portion 16d-3 corresponds to the right side.

[0102] The fourth rotating member 15d has the same configuration as the third rotating member 15c when its left and right sides are reversed and it is translated to the left.

[0103] The first edge 16a-4 of the fourth rotating member 15d extends in the left-right direction (X direction) and is located in the same straight line as the first edge 16a-3 of the third rotating member 15c. The first edge 16a-1 of the fourth rotating member 15d also forms the lower edge of the first vibration damping core unit 12.

[0104] The second edge 16b-4 of the fourth rotating member 15d extends in the left-right direction (X direction) and is located in the same straight line as the second edge 16b-3 of the third rotating member 15c. The second edge 16b-4 of the fourth rotating member 15d is also positioned opposite the second edge 16b-2 of the second rotating member 15b, with a gap in the vertical direction (Z direction). The distance between the second edge 16b-4 of the fourth rotating member 15d and the second edge 16b-2 of the second rotating member 15b is equal to the distance between the second edge 16b-1 of the first rotating member 15a and the second edge 16b-3 of the third rotating member 15c.

[0105] The third edge 16c-4 of the fourth rotating member 15d extends in the vertical direction (Z direction) and is positioned opposite the third edge 16c-3 of the third rotating member 15c, with a gap in the left-right direction (X direction). The third edge 16c-4 of the fourth rotating member 15d is also aligned in the same straight line as the third edge 16c-2 of the second rotating member 15b. The distance between the third edge 16c-4 of the fourth rotating member 15d and the third edge 16c-2 of the third rotating member 15c is equal to the distance between the third edge 16c-1 of the first rotating member 15a and the second edge 16b-2 of the second rotating member 15b.

[0106] The fourth side portion 16d-4 of the fourth rotating member 15d connects the left end of the first side portion 16a-4 and the left end of the second side portion 16b-4, and extends diagonally to the upper left.

[0107] When the fourth rotating member 15d is viewed along the depth direction (Y direction), the first side portion 16a-4 corresponds to the bottom side of the trapezoid, and the second side portion 16b-4 corresponds to the top side. The third side portion 16c-4 corresponds to the right side of the trapezoid, and the fourth side portion 16d-4 corresponds to the left side.

[0108] [Second vibration damping core unit 13] The second vibration damping core unit 13 according to this embodiment has the same shape as the first vibration damping core unit 12 and is composed of four rotating members 17 (the fifth to eighth rotating members 17a to 17d). The fifth to eighth rotating members 17a to 17d are arranged symmetrically with respect to the center CP2 of the second vibration damping core unit 13.

[0109] The second vibration damping core unit 13 has the same configuration as when the first vibration damping core unit 12 is moved downward in parallel.

[0110] As shown in Figure 3, assuming that the first vibration-damping core unit 12 is moved downward in parallel, the first rotating member 15a of the first vibration-damping core unit 12 corresponds to the seventh rotating member 17c of the second vibration-damping core unit 13. The second rotating member 15b of the first vibration-damping core unit 12 corresponds to the eighth rotating member 17d of the second vibration-damping core unit 13.

[0111] Furthermore, the third rotating member 15c of the first vibration damping core unit 12 corresponds to the fifth rotating member 17a of the second vibration damping core unit 13. The fourth rotating member 15d of the first vibration damping core unit 12 corresponds to the sixth rotating member 17b of the second vibration damping core unit 13.

[0112] The first edge 18a-7 of the seventh rotating member 17c and the first edge 18a-8 of the eighth rotating member 17d form the upper edge of the second vibration-damping core unit 13. The first edge 18a-5 of the fifth rotating member 17a and the first edge 18a-6 of the sixth rotating member 17b form the lower edge of the second vibration-damping core unit 13.

[0113] The first vibration damping core unit 12 and the second vibration damping core unit 13 are positioned symmetrically with respect to the central position (the position of a virtual center line CL) in the vertical direction (Z direction) of the vibration damping structure 1. Therefore, the vibration damping drive member 14 is positioned midway between the lower edge (first edge portions 16a-3 and 16a-4) of the first vibration damping core unit 12 and the upper edge (first edge portions 18a-7 and 18a-8) of the second vibration damping core unit 13. In other words, the distance between the lower edge (first edge portions 16a-3 and 16a-4) of the first vibration damping core unit 12 and the vibration damping drive member 14 is equal to the distance between the upper edge (first edge portions 18a-7 and 18a-8) of the second vibration damping core unit 13 and the vibration damping drive member 14.

[0114] [Hinge mechanism] As shown in Figure 3, the first vibration damping core unit 12 and the second vibration damping core unit 13 are connected to other members via a hinge mechanism. Specifically, the first vibration damping core unit 12 is connected between the first support member 2 and the vibration damping drive member 14 via a hinge mechanism. The second vibration damping core unit 13 is also connected between the second support member 3 and the vibration damping drive member 14 via a hinge mechanism.

[0115] Therefore, the vibration damping structure 1 shown in Figure 3 has a configuration in which the first vibration damping core unit 12 and the second vibration damping core unit 13 are connected to each other via a vibration damping drive member 14 and a hinge mechanism.

[0116] In this embodiment, the hinge mechanism is composed of 12 hinges 20 (the first to twelfth hinges 20a to 20l).

[0117] As shown in Figure 3, each of the first hinge 20a, second hinge 20b, third hinge 20c, fourth hinge 20d, fifth hinge 20e, sixth hinge 20f, seventh hinge 20g, eighth hinge 20h, ninth hinge 20i, tenth hinge 20j, eleventh hinge 20k, and twelfth hinge 20l is made of a thin-walled member that extends in the vertical direction (Z direction) and has a relatively small cross-sectional area (cross-section when cut in the XY plane) perpendicular to the vertical direction (Z direction).

[0118] As shown in Figure 3, the first rotating member 15a of the first vibration damping core unit 12 is connected to the first support member 2 via the first hinge 20a. The second rotating member 15b is also connected to the first support member 2 via the second hinge 20b.

[0119] The first hinge 20a and the second hinge 20b are connected to each other at positions close to each other, with respect to the first connection reference position 9a. Specifically, the first hinge 20a and the second hinge 20b are connected in the vicinity of the first connection reference position 9a (position of reference line RLa) such that the first connection reference position 9a is in the middle.

[0120] The first hinge 20a is connected to the right of the first connection reference position 9a, and the second hinge 20b is connected to the left of the first connection reference position 9b. The first hinge 20a and the second hinge 20b are connected at positions symmetrical to each other with respect to the first connection reference position 9a.

[0121] In this embodiment, a connecting member 21a is constructed below the first connection reference position 9a of the first support member 2. Therefore, it can be said that the first hinge 20a and the second hinge 20b are connected to the first support member 2 via the connecting member 21a. Of course, it is also possible to consider the connecting member 21a as a component included in the first support member 2.

[0122] The first hinge 20a is connected to the left end of the first side portion 16a-1 of the first rotating member 15a. The second hinge 20b is connected to the right end of the first side portion 16a-2 of the second rotating member 15b.

[0123] The third rotating member 15c is connected to the first rotating member 15a via a third hinge 20c which is positioned differently from the first hinge 20a when viewed from the vertical direction (Z direction). The third hinge 20c is connected between a position near the right end of the second side portion 16b-1 of the first rotating member 15a and a position near the right end of the second side portion 16b-3 of the third rotating member 15c.

[0124] In this embodiment, the first hinge 20a and the third hinge 20c are positioned differently from each other in the left-right direction (X direction). Specifically, the third hinge 20c is positioned to the right of the first hinge 20a.

[0125] The fourth rotating member 15d is connected to the second rotating member 15b via a fourth hinge 20d which is positioned differently from the second hinge 20b when viewed from the vertical direction (Z direction). The fourth hinge 20d is connected between a position near the left end of the second side portion 16b-2 of the second rotating member 15b and a position near the left end of the second side portion 16b-4 of the fourth rotating member 15d.

[0126] In this embodiment, the second hinge 20b and the fourth hinge 20d are positioned differently from each other in the left-right direction (X direction). Specifically, the fourth hinge 20d is positioned to the left of the second hinge 20b. Furthermore, the third hinge 20c and the fourth hinge 20d are positioned symmetrically with respect to the first connection reference position 9a (the position of the reference line CLa).

[0127] A ninth hinge 20i is connected to the third rotating member 15c, which is positioned differently from the third hinge 20c when viewed from the vertical direction (Z direction). The third rotating member 15c is connected to the vibration-damping drive member 14 via the ninth hinge 20i.

[0128] As shown in Figure 3, the ninth hinge 20i is connected to the left end of the first side portion 16a-3 of the third rotating member 15c. In other words, the ninth hinge 20i is positioned differently from the third hinge 20c in the left-right direction (X direction). On the other hand, the ninth hinge 20i is positioned in the same location as the first hinge 20a in the left-right direction (X direction). In other words, when viewed from the up-down direction (Z direction), the ninth hinge 20i is positioned in the same location as the first hinge 20a.

[0129] A tenth hinge 20j is connected to the fourth rotating member 15d, which is positioned differently from the fourth hinge 20c when viewed from the vertical direction (Z direction). The fourth rotating member 15d is connected to the vibration-damping drive member 14 via the tenth hinge 20j.

[0130] As shown in Figure 3, the tenth hinge 20j is connected to the right end of the first side portion 16a-4 of the fourth rotating member 15d. That is, the tenth hinge 20j is positioned differently from the fourth hinge 20c in the left-right direction (X direction). On the other hand, the tenth hinge 20j is positioned in the same location as the second hinge 20b in the left-right direction (X direction). That is, when viewed from the up-down direction (Z direction), the tenth hinge 20j is positioned in the same location as the second hinge 20b.

[0131] Therefore, the ninth hinge 20i and the tenth hinge 20j are positioned symmetrically with respect to the first connection reference position 9a (the position of the reference line CLa).

[0132] As shown in Figure 3, the fifth rotating member 17a of the second vibration damping core unit 13 is connected to the second support member 3 via the fifth hinge 20e. The sixth rotating member 17b is also connected to the second support member 3 via the sixth hinge 20f.

[0133] The fifth hinge 20e and the sixth hinge 20f are connected to each other at positions close to each other, with reference to the second connection reference position 10a (position of reference line CLa). Specifically, the fifth hinge 20e and the sixth hinge 20f are connected in the vicinity of the second connection reference position 10a (position of reference line CL) such that the second connection reference position 10a is in the middle.

[0134] The fifth hinge 20e is connected to the right of the second connection reference position 10a, and the sixth hinge 20f is connected to the left of the second connection reference position. The fifth hinge 20e and the sixth hinge 20f are connected at positions symmetrical to each other with respect to the second connection reference position 10a.

[0135] Furthermore, the fifth hinge 20e is positioned in the same location as the first hinge 20a and the ninth hinge 20i when viewed from the vertical direction (Z direction). Furthermore, the sixth hinge 20f is positioned in the same location as the second hinge 20b and the tenth hinge 20j when viewed from the vertical direction (Z direction).

[0136] In this embodiment, the connecting member 21b is constructed above the second connection reference position 10a of the second support member 3. Therefore, it can be said that the fifth hinge 20e and the sixth hinge 20f are connected to the second support member 3 via the connecting member 21b. Of course, it is also possible to consider the connecting member 21b as a component included in the second support member 3.

[0137] The fifth hinge 20e is connected to the left end of the first edge 18a-5 of the fifth rotating member 17a. The sixth hinge 20f is connected to the right end of the first edge 18a-6 of the sixth rotating member 17b.

[0138] The seventh rotating member 17c is connected to the fifth rotating member 17a via a seventh hinge 20g, which is positioned differently from the fifth hinge 20e when viewed from the vertical direction (Z direction). The seventh hinge 20g is connected between a position near the right end of the second edge 18b-5 of the fifth rotating member 17a and a position near the right end of the second edge 18b-7 of the seventh rotating member 17c.

[0139] In this embodiment, the fifth hinge 20e and the seventh hinge 20g are positioned differently from each other in the left-right direction (X direction). Specifically, the seventh hinge 20g is positioned to the right of the fifth hinge 20e. Furthermore, when viewed from the up-down direction (Z direction), the seventh hinge 20g is positioned at the same location as the third hinge 20c.

[0140] The eighth rotating member 17d is connected to the sixth rotating member 17b via an eighth hinge 20h, which is positioned differently from the sixth hinge 20f when viewed from the vertical direction (Z direction). The eighth hinge 20h is connected between a position near the left end of the second side portion 18b-6 of the sixth rotating member 17b and a position near the left end of the second side portion 18b-8 of the eighth rotating member 17d.

[0141] In this embodiment, the sixth hinge 20f and the eighth hinge 20h are positioned differently from each other in the left-right direction (X direction). Specifically, the eighth hinge 20h is positioned to the left of the sixth hinge 20f. Furthermore, when viewed from the up-down direction (Z direction), the eighth hinge 20h is positioned at the same location as the fourth hinge 20c.

[0142] Furthermore, the seventh hinge 20g and the eighth hinge 20h are positioned symmetrically with respect to the second connection reference position 10a (the position of the reference line CLa).

[0143] The seventh rotating member 17c is connected to an eleventh hinge 20k, which is positioned differently from the seventh hinge 20g when viewed from the vertical direction (Z direction). The seventh rotating member 17c is connected to the vibration-damping drive member 14 via the eleventh hinge 20k.

[0144] As shown in Figure 3, the 11th hinge 20k is connected to the left end of the first side portion 18a-7 of the 7th rotating member 17c. That is, the 11th hinge 20k is positioned differently from the 7th hinge 20g in the left-right direction (X direction). On the other hand, the 11th hinge 20k is positioned in the same location as the 5th hinge 20e in the left-right direction (X direction). In other words, when viewed from the up-down direction (Z direction), the 11th hinge 20k is positioned in the same location as the 5th hinge 20e.

[0145] The eighth rotating member 17d is connected to a twelfth hinge 20l, which is positioned differently from the eighth hinge 20h when viewed from the vertical direction (Z direction). The eighth rotating member 17d is connected to the vibration-damping drive member 14 via the twelfth hinge 20l.

[0146] As shown in Figure 3, the 12th hinge 20l is connected to the right end of the first side portion 18a-8 of the 8th rotating member 17d. That is, the 12th hinge 20l is positioned differently from the 8th hinge 20h in the left-right direction (X direction). On the other hand, the 12th hinge 20l is positioned in the same location as the 6th hinge 20f in the left-right direction (X direction). In other words, the 12th hinge 20l is positioned in the same location as the 6th hinge 20f when viewed from the up-down direction (Z direction).

[0147] Therefore, the 11th hinge 20k and the 12th hinge 20j are positioned symmetrically with respect to the second connection reference position 10a (position of reference line CLa).

[0148] The vibration damping drive member 14 is a plate-shaped member that extends in the left-right direction (X direction), and is positioned such that the first connection reference position 9a and the second connection reference position 10a (position of the reference line CLa) are at the center.

[0149] A ninth hinge 20i is connected to the upper right end of the vibration-damping drive member 14, and an eleventh hinge 20k is connected to the lower right end. A tenth hinge 20j is connected to the upper side of the left end of the vibration-damping drive member 14, and a twelfth hinge 20l is connected to the lower side of the left end.

[0150] The first vibration-damping core unit 12 and the second vibration-damping core unit 13 are connected to each other via the ninth and tenth hinges 20i and 20j, the vibration-damping drive member 14, and the eleventh and twelfth hinges 20k and 20l.

[0151] As shown in Figure 3, an opening (cavity) 22a extending in the left-right direction (X direction) is formed between the third hinge 20c and the fourth hinge 20d of the first vibration damping core unit 12. In addition, in the first vibration damping core unit 12, an opening 22b extending in the up-down direction (Z direction) is formed between the first connection reference position 9a (connecting member 21a) and the vibration damping drive member 14. The openings 22a and 22b intersect at a right angle at the center CP1 of the first vibration-damping core unit 12. Therefore, a cross-shaped opening is formed in the inner region of the first vibration-damping core unit 12.

[0152] As shown in Figure 3, an opening 23a extending in the left-right direction (X direction) is formed between the seventh hinge 20g and the eighth hinge 20h of the second vibration damping core unit 13. In addition, in the second vibration damping core unit 13, an opening 23b extending in the up-down direction (Z direction) is formed between the second connection reference position 10a (connecting member 21b) and the vibration damping drive member 14. The openings 23a and 23b intersect at a right angle at the center CP2 of the second vibration damping core unit 13. Therefore, a cross-shaped opening is formed in the inner region of the second vibration damping core unit 13.

[0153] In this embodiment, the vibration damping unit 4a is configured symmetrically with respect to a reference line CLa that extends in the vertical direction (Z direction). Furthermore, when viewed from the vertical direction (Z direction), the first hinge 20a, the fifth hinge 20e, the ninth hinge 20i, and the eleventh hinge 20k are positioned in the same location. Furthermore, when viewed from the vertical direction (Z direction), the second hinge 20b, the sixth hinge 20f, the tenth hinge 20j, and the twelfth hinge 20l are positioned in the same location. Furthermore, when viewed from the vertical direction (Z direction), the third hinge 20c and the seventh hinge 20g are positioned in the same location. Furthermore, when viewed from the vertical direction (Z direction), the fourth hinge 20d and the eighth hinge 20h are positioned in the same location.

[0154] In this way, by configuring the vibration damping unit 4a to be symmetrical with respect to the central reference line CLa, it is possible to simplify the structure and easily create the vibration damping unit 4a.

[0155] [Reinforcement members] The reinforcing member 5 is connected between the first support member 2 and the second support member 3, surrounding the three vibration damping units 4a to 4c, thereby reinforcing the rigidity of the vibration damping structure 1. As shown in Figures 1 and 3, in this embodiment, the reinforcing member 5 is configured as a truss structure.

[0156] In this embodiment, the reinforcing member 5 includes a vertical frame member 25 extending in the vertical direction (Z direction), a horizontal frame member 26 extending in the left-right direction (Z direction), and diagonal frame members (bracing members) 27 for forming triangles in the truss structure.

[0157] The vertical frame member 25 includes a left frame member 25a that connects the left end 2a of the first support member 2 to the left end 3a of the second support member 3, and a right frame member 25b that connects the right end 2b of the first support member 2 to the right end 3b of the second support member 3.

[0158] Furthermore, the vertical frame member 25 has intermediate frame members 25c and 25d positioned between the vibration damping units 4 which are arranged along the left-right direction (X direction). The intermediate frame member 25c is positioned between the vibration damping units 4a and 4b. The intermediate frame member 25d is positioned between the vibration damping units 4b and 4c.

[0159] As shown in Figure 1, in the vertical direction (Z direction), reference points RP1 for forming the triangles of the truss structure are set at the center of the four vertical frame members 25 and at a position approximately 1 / 4 of the length away. Furthermore, a reference point RP2 for forming the triangle of the truss structure is set at a predetermined distance from the left and right sides of the vibration damping drive member 14 of each vibration damping unit 4, on the central position in the vertical direction (Z direction) (the position of the virtual center line CL).

[0160] Furthermore, reference points RP3 are set on the first support member 2 and the second support member 3, at positions to the left and right of the first connection reference position 9 (second connection reference position 10). When viewed from the vertical direction (Z direction), the reference points RP2 set to the left and right of the vibration damping drive member 14 and the reference points RP3 set to the left and right of the first connection reference position 9 (second connection reference position 10) are at the same position. The horizontal frame members 26 and diagonal frame members 27 are positioned so that these reference points RP1 to RP3 become the vertices of the triangle of the truss structure, and are connected to the vertical frame members 25.

[0161] As shown in Figure 3, the reinforcing members 5 (truss structure) that are formed in the left and right regions of one vibration damping unit 4 are configured to be symmetrical in the left-right direction (X direction) with respect to a reference line CL that passes through the center of the vibration damping unit 4. By constructing the reinforcing member 5 using a truss structure, it is possible to reduce the weight while maintaining the rigidity of the vibration-damping structure 1.

[0162] For the materials of the first support member 2, the second support member 3, the vibration damping unit 4, the hinge 20, and the reinforcing member 5, it is possible to use resin materials such as epoxy resin (EP), acrylic resin (PMMA), urethane resin, polycarbonate (PC), nylon resin, polyetheretherketone (PEEK), ABS resin, polytetrafluoroethylene (PTFE), phenolic resin (PF), polypropylene (PP), polystyrene, glass fiber composite, and carbon fiber composite.

[0163] Using these resin materials, it is also possible to create the first support member 2, the second support member 3, the vibration damping unit 4, the hinge 20, and the reinforcing member 5 by resin molding such as injection molding or extrusion molding. Each of these elements may be made from a different material in a separate process, or they may be made integrally from the same material in a single process. Furthermore, it is possible to create the first support member 2, the second support member 3, the vibration damping unit 4, the hinge 20, and the reinforcing member 5 using a 3D printer. These are not the only options; other materials and other manufacturing methods may be used.

[0164] The materials used for the upper skin member 6 and lower skin member 7 shown in Figure 1 are materials capable of exhibiting high rigidity. For example, carbon fiber reinforced plastic (CFPR) can be used. Of course, it is not limited to this, and any other material may be used.

[0165] In the example shown in Figure 1, a configuration is illustrated in which three vibration damping units 4a to 4c are arranged. The number of vibration damping units 4 arranged in the vibration damping structure 1 is not limited, and more vibration damping units 4 may be arranged. By forming a fine peripheral structure using multiple vibration damping units 4 (a first vibration damping core unit 12 and a second vibration damping core unit 13), it is also possible to construct a vibration damping structure 1 related to this technology as a metamaterial structure. Of course, a vibration damping structure 1 including three vibration damping units 4a to 4c, as shown in Figure 1, can also be included in the metamaterial structure.

[0166] [Vibration damping mechanism] The vibration control mechanism of vibration control structure 1 will be explained.

[0167] As described above, in the vibration damping structure 1 according to this embodiment, vibration damping units 4a to 4c make it possible to suppress vertical (Z-direction) vibrations acting on the first support member 2 and the second support member 3.

[0168] For example, suppose that vibrations in the vertical direction (Z direction) are input to the first support member 2 and the second support member 3 at any position in the left-right direction (X direction) of the vibration damping structure 1 shown in Figure 1. Regardless of the position in the left-right direction (X direction) of the vibration damping structure 1 where the vertical vibrations (Z direction) are input, the vibration damping structure can still function.

[0169] Various configurations are possible for inputting vertical (Z-direction) vibrations to the first support member 2 and the second support member 3. For example, a vibration source is connected to the first support member 2, and vertical (Z-direction) vibrations are input from the connection point. As a result, the first support member 2 and the second support member 3 vibrate vertically (Z-direction).

[0170] Alternatively, a vibration source is connected to the second support member 3, and vibrations in the vertical direction (Z direction) are input from the connection point. As a result, the first support member 2 and the second support member 3 vibrate in the vertical direction (Z direction).

[0171] Alternatively, vibration sources may be connected to both the first support member 2 and the second support member 3, and vertical vibrations (in the Z direction) may be input to both the first support member 2 and the second support member 3.

[0172] Furthermore, it is possible that vertical vibrations (in the Z-direction) may be input to the left end of the vibration-damping structure 1 shown in Figure 1. In this case, for example, a vibration source is connected to any position on the left frame member 25a (including the left ends 2a and 3a), and vertical vibrations (in the Z-direction) are input to the first support member 2 and the second support member 3. Of course, it is also possible that the vibration source is connected to the entire left frame member 25a.

[0173] Furthermore, it is possible that vertical vibrations (in the Z direction) may be input to the right end of the vibration-damping structure 1 shown in Figure 1. In this case, for example, a vibration source is connected to any position on the right frame member 25b (including the right end portions 2b and 3b), and vertical vibrations (in the Z direction) are input to the first support member 2 and the second support member 3. Of course, it is also possible that the vibration source is connected to the entire right frame member 25b.

[0174] Furthermore, vibrations in the vertical direction (Z direction) may be input to the first support member 2 and the second support member 3 via sound waves (vibrations of air, etc.). Even in this case, it is possible to exert a vibration damping function against the vertical direction (Z direction) vibrations of the first support member 2 and the second support member 3.

[0175] Hereinafter, the position where vertical vibration (Z-direction) is applied to the first support member 2 and the second support member 3 will be referred to as the vibration input point VI. For example, the vibration input point VI can be defined as the position where the displacement (amplitude) of the vertical vibration (Z-direction) acting on the first support member 2 and the second support member 3 is maximum. The vibration input point VI can also be said to be the position where the vibration energy of the vertical vibration (Z-direction) is maximum.

[0176] The vibration input point VI is a parameter set at the same position relative to the first support member 2 and the second support member 3 in the vertical direction (Z direction). In the following, the vibration input point VI will be described as a position defined with respect to the first support member 2.

[0177] Of course, the following explanation also holds true when the vibration input point VI is defined as a position relative to the second support member 3. Furthermore, the following explanation also holds true when the vibration input point VI is defined at the same position in the vertical direction (Z direction) of both the first support member 2 and the second support member 3.

[0178] Therefore, in the following explanation, setting a vibration input point VI at a predetermined position on the first support member 2 is equivalent to setting a vibration input point VI on the second support member 3, and setting a vibration input point VI on both the first support member 2 and the second support member 3. Of course, the set vibration input point VI will be at the same position in the vertical direction (Z direction).

[0179] Figures 4 to 7 are schematic diagrams illustrating how vibration damping structure 1 attenuates vibrations in the vertical direction (Z direction). Here, the position of the left end of vibration damping structure 1, i.e., the position of the left end 2a of the first support member 2, is set as the vibration input point VI to which vibrations in the vertical direction (Z direction) are input. Furthermore, the upper skin member 6 and the lower skin member 7 are not shown in Figures 4 to 7.

[0180] Figures 4 and 6 show the case when the first support member 2 and the second support member 3 are displaced upward in the vertical direction (Z direction) due to vibration in the vertical direction (Z direction). This upward displacement of the first support member 2 and the second support member 3 in the vertical direction (Z direction) caused by vibration in the vertical direction (Z direction) is called the first vibration displacement.

[0181] Figures 5 and 7 show the case when the first support member 2 and the second support member 3 are displaced downward in the vertical direction (Z direction) due to vibration in the vertical direction (Z direction). This downward displacement of the first support member 2 and the second support member 3 in the vertical direction (Z direction) caused by vibration in the vertical direction (Z direction) is called the second vibration displacement.

[0182] Furthermore, in Figures 4 to 7, the shades from white to black represent the amount of displacement at each position (part) of the vibration damping structure 1. The closer the color is to black from white, the greater the displacement in that area. In other words, the larger the displacement, the darker the black color in that area is depicted.

[0183] In each vibration damping unit 4, if the first vibration damping core unit 12 (second vibration damping core unit 13) contains a large amount of dark black areas, it indicates that the first vibration damping core unit 12 (second vibration damping core unit 13) is significantly deformed due to vibration in the vertical direction (Z direction). The displacement amounts shown in Figures 4 to 7 were calculated by computer simulation.

[0184] Let us focus on the vibration damping unit 4a, which is located at the position closest to the vibration input point VI, i.e., at the leftmost end. As shown in Figures 4 and 6, when a first vibration displacement occurs due to vibration in the vertical direction (Z direction), the first vibration damping core unit 12 of the vibration damping unit 4a is deformed by extension along the vertical direction (Z direction) and by compression along the left-right direction (X direction) in accordance with the first vibration displacement. The first vibration damping core unit 12 has such modes of deformation in accordance with the first vibration displacement.

[0185] As shown in Figure 6, when viewed from the depth direction (Y direction), the first rotating member 15a of the first vibration damping core unit 12 rotates clockwise with respect to the first hinge 20a and the third hinge 20c. The second rotating member 15b rotates counterclockwise with respect to the second hinge 20b and the fourth hinge 20d. The third rotating member 15c rotates counterclockwise with respect to the third hinge 20c and the ninth hinge 20i. The fourth rotating member 15d rotates clockwise with respect to the fourth hinge 20d and the tenth hinge 20j.

[0186] When comparing the amount of rotation (displacement) of the first rotating member 15a and the second rotating member 15b with the amount of rotation of the third rotating member 15c and the fourth rotating member 15d, the amount of rotation of the third rotating member 15c and the fourth rotating member 15d, which are closer to the vibration damping drive member 14, is larger.

[0187] The opening 22a of the first vibration-damping core unit 12, which extends in the left-right direction (X direction), deforms to widen along the up-down direction (Z direction). The opening 22b of the first vibration-damping core unit 12, which extends in the up-down direction (Z direction), deforms to narrow along the left-right direction (X direction). In other words, the opening 22a deforms to open, and the opening 22b deforms to close.

[0188] As shown in Figures 4 and 6, when a first vibration displacement occurs due to vibration in the vertical direction (Z direction), the second vibration damping core unit 13 of the vibration damping unit 4a is compressed along the vertical direction (Z direction) and stretched along the horizontal direction (X direction) in response to the first vibration displacement. The second vibration damping core unit 13 has such modes of deformation in response to the first vibration displacement.

[0189] As shown in Figure 6, when viewed from the depth direction (Y direction), the fifth rotating member 17a of the second vibration damping core unit 13 rotates clockwise with respect to the fifth hinge 20e and the seventh hinge 20g. The sixth rotating member 17b rotates counterclockwise with respect to the sixth hinge 20f and the eighth hinge 20h. The seventh rotating member 17c rotates counterclockwise with respect to the seventh hinge 20g and the eleventh hinge 20k. The eighth rotating member 17d rotates clockwise with respect to the eighth hinge 20h and the twelfth hinge 20l.

[0190] When comparing the amount of rotation (displacement) of the fifth rotating member 17a and the sixth rotating member 17b with the amount of rotation of the seventh rotating member 17c and the eighth rotating member 17d, the amount of rotation of the seventh rotating member 17c and the eighth rotating member 17d, which are closer to the vibration damping drive member 14, is larger.

[0191] The opening 23a of the second vibration-damping core unit 13, which extends in the left-right direction (X direction), deforms to narrow along the up-down direction (Z direction). The opening 23b of the second vibration-damping core unit 13, which extends in the up-down direction (Z direction), deforms to widen along the left-right direction (X direction). In other words, opening 23a deforms to close, and opening 23b deforms to open.

[0192] As shown in Figures 4 and 6, the vibration damping drive member 14 is displaced downward in the vertical direction (Z direction) in response to the first vibration displacement. That is, when the first support member 2 and the second support member 3 are displaced upward, the vibration damping drive member 14 is displaced downward to counteract that upward displacement.

[0193] As shown in Figures 5 and 7, when a second vibration displacement occurs due to vibration in the vertical direction (Z direction), the first vibration damping core unit 12 of the vibration damping unit 4a is compressed along the vertical direction (Z direction) and stretched along the horizontal direction (X direction) in response to the second vibration displacement. The first vibration damping core unit 12 has such modes of deformation in response to the second vibration displacement.

[0194] As shown in Figure 7, when viewed from the depth direction (Y direction), the first rotating member 15a of the first vibration damping core unit 12 rotates counterclockwise with respect to the first hinge 20a and the third hinge 20c. The second rotating member 15b rotates clockwise with respect to the second hinge 20b and the fourth hinge 20d. The third rotating member 15c rotates clockwise with respect to the third hinge 20c and the ninth hinge 20i. The fourth rotating member 15d rotates counterclockwise with respect to the fourth hinge 20d and the tenth hinge 20j.

[0195] When comparing the amount of rotation (displacement) of the first rotating member 15a and the second rotating member 15b with the amount of rotation of the third rotating member 15c and the fourth rotating member 15d, the amount of rotation of the third rotating member 15c and the fourth rotating member 15d, which are closer to the vibration damping drive member 14, is larger.

[0196] The opening 22a of the first vibration-damping core unit 12, which extends in the left-right direction (X direction), deforms to narrow along the up-down direction (Z direction). The opening 22b of the first vibration-damping core unit 12, which extends in the up-down direction (Z direction), deforms to widen along the left-right direction (X direction). In other words, the opening 22a deforms to close, and the opening 22b deforms to open.

[0197] As shown in Figures 5 and 7, when a second vibration displacement occurs due to vibration in the vertical direction (Z direction), the second vibration damping core unit 13 of the vibration damping unit 4a is deformed by extension along the vertical direction (Z direction) and by compression along the left-right direction (X direction) in response to the second vibration displacement. The second vibration damping core unit 13 has such modes of deformation depending on the second vibration displacement.

[0198] As shown in Figure 7, when viewed from the depth direction (Y direction), the fifth rotating member 17a of the second vibration damping core unit 13 rotates counterclockwise with respect to the fifth hinge 20e and the seventh hinge 20g. The sixth rotating member 17b rotates clockwise with respect to the sixth hinge 20f and the eighth hinge 20h. The seventh rotating member 17c rotates clockwise with respect to the seventh hinge 20g and the eleventh hinge 20k. The eighth rotating member 17d rotates counterclockwise with respect to the eighth hinge 20h and the twelfth hinge 20l.

[0199] When comparing the amount of rotation (displacement) of the fifth rotating member 17a and the sixth rotating member 17b with the amount of rotation of the seventh rotating member 17c and the eighth rotating member 17d, the amount of rotation of the seventh rotating member 17c and the eighth rotating member 17d, which are closer to the vibration damping drive member 14, is larger.

[0200] The opening 23a of the second vibration-damping core unit 13, which extends in the left-right direction (X direction), deforms to widen along the up-down direction (Z direction). The opening 23b of the second vibration-damping core unit 13, which extends in the up-down direction (Z direction), deforms to narrow along the left-right direction (X direction). In other words, opening 23a deforms to open, and opening 23b deforms to close.

[0201] As shown in Figures 5 and 7, the vibration damping drive member 14 is displaced upward in the vertical direction (Z direction) in response to the second vibration displacement. That is, when the first support member 2 and the second support member 3 are displaced downward, the vibration damping drive member 14 is displaced upward to counteract that downward displacement.

[0202] In the vibration damping structure 1 according to this embodiment, when the first support member 2 and the second support member 3 vibrate in the vertical direction (Z direction), the first vibration damping core unit 12 and the second vibration damping core unit 13 undergo complementary deformations.

[0203] Specifically, in response to the vertical vibration (Z-direction) of the first support member 2 and the second support member 3, the first vibration-damping core unit 12 and the second vibration-damping core unit 13 each undergo repeated tensile and compressive deformation along the vertical direction (Z-direction).

[0204] When the first vibration damping core unit 12 undergoes tensile deformation along the vertical direction (Z direction), the second vibration damping core unit 13 undergoes compressive deformation along the vertical direction (Z direction). When the first vibration damping core unit 12 undergoes compressive deformation along the vertical direction (Z direction), the second vibration damping core unit 13 undergoes tensile deformation along the vertical direction (Z direction).

[0205] Furthermore, the extensional and compressive deformation of the first vibration-damping core unit 12 is achieved by the rotation of the first to fourth rotating members 15a to 15d. The extensional and compressive deformation of the second vibration-damping core unit 13 is achieved by the rotation of the fifth to eighth rotating members 17a to 17d.

[0206] Furthermore, the vibration damping drive member 14, positioned between the first vibration damping core unit 12 and the second vibration damping core unit 13, is displaced in a direction that cancels out the vertical (Z-direction) vibrations of the first support member 2 and the second support member 3.

[0207] The complementary deformation of the first vibration-damping core unit 12 and the second vibration-damping core unit 13, the rotation of each rotating member (the first to eighth rotating members 15a to 15 and 17a to 17d), and the displacement of the vibration-damping drive member 14 make it possible to efficiently suppress vibrations acting on the first support member 2 and the second support member 3.

[0208] When vibrations in the vertical direction (Z direction) are applied to the first support member 2 and the second support member 3, the vibration damping unit 4 (first vibration damping core unit 12, second vibration damping core unit 13, and vibration damping drive member 14) resonates locally in a specific frequency band. From an energy perspective, the excitation energy is used for this resonance, and from a force perspective, the locally resonating core generates a force that cancels out the displacement of the adjacent core.

[0209] In the following, the deformation of the vibration damping unit 4, which dampens vibrations in the vertical direction (Z direction), may be referred to as vibration damping operation. Vibration damping operation can be considered as the vibration of the vibration damping unit 4 corresponding to the frequency of vibrations in the vertical direction (Z direction).

[0210] As shown in Figures 4 and 5, the vibration damping unit 4b located in the center and the vibration damping unit 4d located at the far right also perform the vibration damping operation shown in Figures 6 and 7 in accordance with the first and second vibration displacements of the first support member 2 and the second support member 3.

[0211] On the other hand, as shown in Figures 4 and 5, the displacement of each part of the first vibration damping core unit 12 and the second vibration damping core unit 13 of the vibration damping unit 4b located in the center is smaller than that of the vibration damping unit 4a at the left end. Furthermore, the displacement of each part of the vibration damping unit 4c at the right end is even smaller.

[0212] As a result, vertical vibrations (in the Z-direction) input to the left end of the vibration damping structure 1 are damped from left to right by the vibration damping action of the three vibration damping units 4a to 4c. Then, at the right end of the vibration damping structure 1, i.e., the right frame member 25b, vertical vibrations (in the Z-direction) are sufficiently suppressed.

[0213] As shown in Figures 4 and 5, the vibration damping unit 4a closest to the vibration input point VI deforms the most in response to the vertical (Z-direction) displacement of the first support member 2 and the second support member 3 caused by the vertical (Z-direction) vibration. Furthermore, the further away from the vibration input point VI is along the left-right direction (X-direction), the more the vertical (Z-direction) vibration is attenuated. Therefore, the further away a vibration damping unit 4 is positioned along the left-right direction (X-direction) from the vibration input point VI, the less it deforms.

[0214] For example, a vibration input point VI can be set at any position in the left-right direction (X direction). As shown in Figure 3, the vibration input point VI may be set at one end of the first support member 3 in the left-right direction (X direction). However, it is not limited to this, and the vibration input point VI may be set at the center of the first support member 3 in the left-right direction (X direction).

[0215] The vibration damping operation is performed so that the vibration damping unit 4 closest to the set vibration input point VI deforms the most. The further away from the vibration input point VI in the left-right direction (X direction), the greater the damping of vibrations in the up-down direction (Z direction).

[0216] For example, a vibration input point VI is set at a predetermined position on the first support member 2. A vibration output point is set at a position spaced apart from the vibration input point VI on the first support member 2. For example, in the examples shown in Figures 4 and 5, the position of the right end 2b of the first support member 2 is set as the vibration output point VO. At this vibration output point VO, vibrations in the vertical direction (Z direction) are sufficiently attenuated.

[0217] Setting a vibration output point VO on the first support member 2 is equivalent to setting a vibration output point VO on the second support member 3, and also equivalent to setting a vibration output point VO on both the first support member 2 and the second support member 3. Of course, the set vibration output point VO will be at the same position in the vertical direction (Z direction).

[0218] [Adjusting the resonant frequency] The vibration damping operation shown in Figures 4 to 7 occurs when the frequency of vertical (Z-direction) vibrations acting on the first support member 2 and the second support member 3 reaches a predetermined value, causing the deformation of the first vibration damping core unit 12 and the second vibration damping core unit 13 to be maximized, and the vibration damping effect to peak. The frequency of the vertical (Z-direction) vibration that occurs at the deformation amount with the greatest vibration damping effect is defined as the resonant frequency of the vibration damping unit 4. By adjusting the resonant frequency of the vibration damping unit 4, it is possible to appropriately change the vertical (Z-direction) vibration that is the target of vibration damping.

[0219] For example, the resonant frequency of the vibration damping unit is set based on the frequency of the vertical (Z-direction) vibration that is to be damped. This makes it possible to sufficiently suppress the vertical (Z-direction) vibration that is to be damped.

[0220] For example, the resonant frequency of each of the multiple vibration damping units 4 shown in Figure 1, etc., is matched to the frequency of the vertical (Z-direction) vibration to be damped. This makes it possible to sufficiently suppress the vertical (Z-direction) vibration to be damped.

[0221] Alternatively, it is possible to design the resonant frequencies of each of the multiple vibration damping units 4 to be slightly offset. This makes it possible to increase the amplitude of vibrations in the vertical direction (Z direction) that can be damped. In other words, it makes it possible to broaden the frequency band of vibrations in the vertical direction (Z direction) that can be damped. In addition, any method may be used to set the resonant frequency of the vibration damping unit 4, based on the frequency of the vertical (Z-direction) vibration that is to be damped.

[0222] For example, by increasing the moment of inertia of the vibration damping unit 4, it becomes possible to set the resonant frequency of the vibration damping unit 4 lower, thereby lowering the frequency of vibrations in the vertical direction (Z direction) that are to be damped. For example, it is possible to configure the vibration damping unit 4 to dampen vertical (Z-direction) vibrations that fall within the frequency range of 20Hz to 1000Hz. In other words, by applying this technology, it becomes possible to achieve sufficient vibration damping effects against vibrations with frequencies below 100Hz, which are considered low frequencies.

[0223] Various methods can be used to adjust the resonant frequency of the vibration damping unit 4.

[0224] [Installation of weights (mass)] By placing one or more weights in each of the one or more vibration damping units 4 arranged in the vibration damping structure 1, it is possible to adjust the resonant frequency of the vibration damping units 4.

[0225] Since weight is necessary for it to function as a counterweight, it is preferable to use a metal with a high specific gravity. However, it is possible to use relatively high-density and readily available metal materials such as iron or tungsten. The materials are not limited to these; depending on the desired resonant frequency, relatively light metals such as aluminum may also be used. Furthermore, counterweights made of any other material may be used.

[0226] Figures 8 to 10 are schematic diagrams showing examples of the arrangement of weights 29 relative to the vibration damping unit 4. In the examples shown in Figures 8 to 10, the first to eighth weights 29a to 29h are arranged as one or more weights 29.

[0227] The first to fourth weights 29a to 29d are placed in the first vibration damping core unit 12. Specifically, they are arranged as follows. The first weight 29a is positioned on the first rotating member 15a. The second weight 29b is positioned on the second rotating member 15b. The third weight 29c is positioned on the third rotating member 15c. The fourth weight 29d is positioned on the fourth rotating member 15d.

[0228] The fifth to eighth weights 29e to 29h are placed in the second vibration damping core unit 13. Specifically, they are arranged as follows. The fifth weight 29e is positioned on the fifth rotating member 17a. The sixth weight 29f is positioned on the sixth rotating member 17b. The seventh weight, 29g, is placed on the seventh rotating member, 17c. The eighth weight 29h is positioned on the eighth rotating member 17d.

[0229] In the examples shown in Figures 8 to 10, the first to eighth weights 29a to 29h are made of the same material and have the same shape. Specifically, when viewed from the depth direction (Y direction), the first to eighth weights 29a to 29h have a circular shape.

[0230] To lower the resonant frequency and thus the attenuating frequency, it is advantageous to increase the total weight of the weights 29 within the vibration damping unit 4. Therefore, as shown in Figures 8 to 10, arranging multiple weights 29 is effective.

[0231] In the examples shown in Figures 8 to 10, the first weight 29a, the second weight 29b, the third weight 29c, and the fourth weight 29d are arranged symmetrically with respect to the center CP1 of the first vibration-damping core unit 12. The fourth weight 29e, the fifth weight 29f, the sixth weight 29g, and the seventh weight 29h are arranged symmetrically with respect to the center CP2 of the second vibration-damping core unit 13.

[0232] In the example shown in Figure 8, the first to fourth weights 29a to 29d are positioned close to the center CP1 of the first vibration-damping core unit 12. That is, each of the first to fourth weights 29a to 29d is positioned near the vertex between the second edge 16b (see Figure 3) and the third edge 16c (see Figure 3) of the first to fourth rotating members 15a to 15d.

[0233] In the example shown in Figure 8, the fifth to eighth weights 29e to 29h are positioned close to the center CP2 of the second vibration-damping core unit 13. That is, each of the fifth to eighth weights 29e to 29h is positioned near the vertex between the second edge 18b (see Figure 3) and the third edge 18c (see Figure 3) of the fifth to eighth rotating members 17a to 17d.

[0234] In the example shown in Figure 9, the first to fourth weights 29a to 29d are positioned on the left and right end sides of the first vibration-damping core unit 12. That is, each of the first to fourth weights 29a to 29d is positioned near the vertex between the second side 16b (see Figure 3) and the fourth side 16d (see Figure 3) of the first to fourth rotating members 15a to 15d.

[0235] In the example shown in Figure 9, the fifth to eighth weights 29e to 29h are positioned on the left and right end sides of the second vibration-damping core unit 13. That is, each of the fifth to eighth weights 29e to 29h is positioned near the vertex between the second edge 18b (see Figure 3) and the fourth edge 18d (see Figure 3) of the fifth to eighth rotating members 17a to 17d.

[0236] In the example shown in Figure 10, the first to fourth weights 29a to 29d are positioned on the upper and lower end sides of the first vibration-damping core unit 12. That is, each of the first to fourth weights 29a to 29d is positioned near the vertex between the first edge 16a (see Figure 3) and the third edge 16c (see Figure 3) of the first to fourth rotating members 15a to 15d.

[0237] Also, in the example shown in FIG. 10, the fifth to eighth weights 29e to 29h are arranged on the upper and lower end sides of the second vibration damping core unit 13. That is, each of the fifth to eighth weights 29e to 29h is arranged at a position near the vertex between the first side portion 18a (see FIG. 3) and the third side portion 18c (see FIG. 3) of the fifth to eighth rotating members 17a to 17d.

[0238] FIG. 11 is a graph showing vibration damping with respect to the frequency of vibration in the vertical direction (Z direction) when the vibration damping unit 4 shown in FIGS. 8 to 10 is used.

[0239] The solid line described as "centered" in the figure is a graph when the vibration damping unit 4 shown in FIG. 8 is used. The wavy line described as "shifted left and right" in the figure is a graph when the vibration damping unit shown in FIG. 9 is used. The wavy line described as "shifted up and down" in the figure is a graph when the vibration damping unit shown in FIG. 10 is arranged.

[0240] As shown in FIG. 11, it is possible to vary the frequency at which the most attenuation can occur according to the arrangement positions of the first to eighth weights 29a to 29h. That is, it is possible to adjust the resonance frequency of the vibration damping unit 4.

[0241] The "centered" configuration shown in FIG. 8 can set the resonance frequency to be the lowest. The "shifted left and right" configuration shown in FIG. 9 can set the resonance frequency higher than the "centered" configuration. The "shifted up and down" configuration shown in FIG. 10 can set the resonance frequency even higher.

[0242] Thus, by adjusting the position of the weight 29, it is possible to easily adjust the resonance frequency of the vibration damping unit 4. As described above, it is considered that there is a correlation between the resonance frequency and the moment of inertia. For example, by focusing on the distance between each hinge 20 and the weight 29, it is possible to adjust the moment of inertia, that is, to adjust the resonance frequency.

[0243] The further the weight 29 is moved from the hinge 20, which serves as the reference point for the rotation of each rotating member 15(17), the greater the moment of inertia of the rotating member 15(17). Therefore, by positioning the weight 29 further away from the hinge 20, it is possible to lower the resonant frequency of the vibration damping unit 4. Of course, if it is desired to increase the frequency of the damped vibration, it is also possible to design the unit so that the weight 29 is closer to the hinge 20.

[0244] Furthermore, as shown in Figure 11, there are frequencies at which the damping effect decreases for vibrations in the vertical direction (Z direction). As can be seen from this point, it is important to appropriately set the resonance frequency of the vibration damping unit 4 based on the frequency of the vertical direction (Z direction) vibration that is to be damped.

[0245] Figures 12 to 15 are schematic diagrams showing other examples of the arrangement of the weight 29 relative to the vibration damping unit 4. In the example shown in Figure 12, when viewed from the depth direction (Y direction), three small circular weights 31 are arranged as a set on each rotating member 15 (17). The set of three weights 31 is placed on the left and right ends of the first vibration damping core unit 12 and the second vibration damping core unit 13. It is also possible to consider the set of three weights 31 as the first to eighth weights.

[0246] In the example shown in Figure 13, when viewed from the depth direction (Y direction), oval-shaped weights 29 are placed on each rotating member 15 (17). A virtual line L is drawn from the vertex of each rotating member 15 (17) closest to the center CP1 (CP2) at a 45-degree angle to the vertical direction (Z direction), toward the fourth side 16d (18d) (see Figure 3). Each weight 29 is positioned such that the major axis of its long side lies on this virtual line L.

[0247] In the example shown in Figure 14, when viewed from the depth direction (Y direction), the weight 29, which has a regular hexagonal shape, is positioned in the center of each rotating member 15 (17). In the example shown in Figure 15, when viewed from the depth direction (Y direction), a star-shaped weight 29 is positioned in the center of each rotating member 15 (17).

[0248] The number, weight, shape, and placement of the one or more weights 29 placed on the vibration damping unit 4 are not limited and can be set arbitrarily. For example, the number, weight, shape, and placement of the one or more weights 29 can be set based on the frequency of the vertical vibration (Z direction) to be damped. Only one of these parameters may be set.

[0249] The shape of the weight 29 when viewed from the depth direction (Y direction) can be adapted to a wide variety of shapes with a high degree of freedom. For example, shapes suitable for mass production, such as circles, rectangles, and star shapes, can be adopted. In addition, shapes such as rectangles with long sides, ellipses with long axes, arc shapes, and sector shapes with various angles can be adopted.

[0250] A weight 29 may be placed on any one of the first to fourth rotating members 15a to 15d of the first vibration damping core unit 12. A weight 29 may also be placed on any one of the fifth to eighth rotating members 17a to 17d of the second vibration damping core unit 12.

[0251] When viewed from the depth direction (Y direction), multiple weights 29 of different shapes or multiple weights 29 of different materials may be arranged. In addition, the weights 29 may be arranged at positions that are not symmetrical with respect to the center CP1 (CP2) of the first vibration damping core unit 12 (second vibration damping core unit 13).

[0252] In the depth direction (Y direction), a weight 29 larger in size (thickness) than each rotating member 15 (17) may be placed. For example, through holes may be formed in each rotating member 15 (17), and the weight 29 may be inserted into these through holes. In this case, both ends of the weight 29 in the depth direction (Y direction) are designed to be larger in size than the through holes. This makes it possible to achieve a configuration in which the weight 29 does not easily come out of the through holes. Furthermore, since the total weight of the weight 29 can be increased, it is easy to lower the frequency of the vibrations to be damped.

[0253] Typically, the vibration damping unit 4 is designed so that the resonant frequencies of each rotating member 15 (17) are aligned. Also typically, the vibration damping unit 4 is designed so that the resonant frequencies of the first vibration damping core unit 12 and the second vibration damping core unit 13 are aligned. On the other hand, the vibration damping unit 4 may be designed with different resonant frequencies for each of the rotating members 15 (17). The vibration damping unit 4 may also be designed with different resonant frequencies for the first vibration damping core unit 12 and the second vibration damping core unit 13.

[0254] [Adjusting the size of each hinge 20 (thin-walled member)] The resonant frequency of the vibration damping unit 4 can be adjusted by adjusting the thickness of the first to twelfth hinges 20a to 20l, which are made of thin-walled material.

[0255] For example, for each of the first hinge 20a, second hinge 20b, third hinge 20c, fourth hinge 20d, fifth hinge 20e, sixth hinge 20f, seventh hinge 20g, eighth hinge 20h, ninth hinge 20i, tenth hinge 20j, eleventh hinge 20k, and twelfth hinge 20l shown in Figure 3, it is possible to set the size of the cross section (cross section when cut in the XY plane) perpendicular to the vertical direction (Z direction) based on the frequency of the vertical vibration (Z direction) that is to be damped.

[0256] Figure 16 is a graph showing the vibration damping with respect to the frequency of vibration in the vertical direction (Z direction) for hinges 20a to 20l, 1.1 mm, 1.3 mm, 1.4 mm, and 1.5 mm in the left-right direction (X direction).

[0257] As shown in FIG. 16, the smaller the cross-sectional areas of the first to twelfth hinges 20a to 20l are, the lower the resonance frequency can be set, and the frequency of the vertically (Z-direction) vibration that can be attenuated can be lowered. In this example, by changing the size in the left-right direction (X-direction) from 1.1 mm to 1.5 mm, the frequency in the region where the vibration attenuation is less than -40 dB could be changed from about 44 Hz to about 64 Hz.

[0258] This is considered to be due to the difference in the spring forces acting on the first vibration damping core unit 12 and the second vibration damping core unit 13 from each hinge 20 in response to the vertical (Z-direction) vibration of the first support member 2 and the second support member 3.

[0259] By adjusting the cross-sectional area of the hinge 20 in this way, it is possible to easily adjust the resonance frequency of the vibration damping unit 4.

[0260] Note that the configuration of the hinge 20 is not limited, and a hinge or the like using a torsion spring may be used. Even in this case, it is possible to adjust the resonance frequency of the vibration damping unit 4 by adjusting the spring constant or the like of the torsion spring.

[0261] In addition, it is possible to adjust the resonance frequency of the vibration damping unit 4 by adjusting the material, shape, size, etc. of the vibration damping unit 4. Also, it is possible to adjust the resonance frequency of the vibration damping unit 4 by adjusting the material, shape, size, etc. of the reinforcing member configured around the vibration damping unit 4.

[0262] [Variations of the Reinforcing Member] FIG. 17 is a schematic diagram showing another configuration example of the reinforcing member 5. In the example shown in FIG. 17, the regions around the three vibration damping units 4a to 4c between the first support member 2 and the second support member 3 are constituted by a plate-like member 33. The plate-like member 33 is used as the reinforcing member 5.

[0263] In the example shown in Figure 17, the first support member 2, the second support member 3, and the plate-shaped member 33 are integrally constructed. Of course, the first support member 2, the second support member 3, and the plate-shaped reinforcing member 5(33) may be manufactured separately and then connected.

[0264] As a method for creating the vibration damping structure 1 shown in Figure 17, a rectangular plate member is prepared with the vertical direction (Z direction) as the shorter side and the horizontal direction (X direction) as the longer side. First connection reference positions 9a to 9c are set on the first longer side portion 35a of the plate member, and second connection reference positions 10a to 10c are set on the second longer side portion 35b. Furthermore, the first long side portion 35a functions as the first support member 2, and the second long side portion 35b functions as the second support member 3.

[0265] An opening 36 (36a to 36c) is created in the region between a first connection reference position 9 and a second connection reference position 10 that are opposite to each other in the vertical direction (Z direction) for arranging the vibration damping unit 4. The vibration damping unit 4 is placed inside the opening 36 and connected to the first connection reference position 9 and the second connection reference position 10 via a hinge mechanism (first hinge 20a, second hinge 20b, fifth hinge 20e, sixth hinge 20f).

[0266] In the vibration damping structure 1 shown in Figure 17, a left-side opening 37a is formed on the left side of each vibration damping unit 4, providing clearance (gap) between it and the reinforcing member 5. A right-side opening 37b is also formed on the right side of each vibration damping unit 4, providing clearance between it and the reinforcing member 5. The left-side opening 37a and the right-side opening 37b are formed symmetrically with respect to the reference line CL.

[0267] For example, the left opening 37a, the right opening 37b, the openings 22a and 22b of the first vibration damping core unit 12, and the openings 23a and 23b of the second vibration damping core unit 13 are cut out from a rectangular plate member. This makes it possible to create the vibration damping structure 1 integrally from the plate member.

[0268] Figure 18 is a schematic diagram showing another configuration example of the reinforcing member 5. The vibration damping unit 4 is not shown in Figure 18.

[0269] In the example shown in Figure 18, the shape of the reinforcing member 5 is calculated by topology optimization. The goal is to improve rigidity by adding appropriate reinforcement to the empty space between adjacent vibration damping units 4 while suppressing the mass increase of the vibration damping structure 1. To meet the requirement of maximizing rigidity with a limited volume of material, topology optimization was performed that could be applied to the vibration damping structure 1. The optimization was performed to satisfy two conditions: the need for an opening in which the vibration damping units 4 are placed, and the fact that the optimal solution for the configuration of the reinforcing member 5 is a periodic structure from the viewpoint of vibration damping performance. Topology optimization makes it possible to realize a reinforcing member 5 that is advantageous in terms of weight reduction and rigidity. Furthermore, the optimization algorithm is not limited, and any optimization algorithm can be adopted.

[0270] In order for one or more vibration damping units 4 to appropriately dampen vibrations in response to vertical vibrations of the first support member 2 and the second support member 3, a gap (clearance) is provided between each of the one or more vibration damping units 4 and the reinforcing member 5. In this embodiment, a gap of at least 1 mm is provided between each of the one or more vibration damping units 4 and the reinforcing member 5.

[0271] In other words, the size of the gap between each of the one or more vibration damping units 4 and the reinforcing member 5 at the closest point is designed to be at least 1 mm. In the example shown in Figures 1 to 3, the gap between the fourth side portion 16d (18d) of the rotating member 15 (17) and the oblique frame member 27 is designed to be at least 1 mm.

[0272] Similarly, in the example shown in Figure 17, the gap between the fourth edge portion 16d (18d) of the rotating member 15 (17) (see Figure 3) and the end face of the opposing plate-shaped member 33 is designed to be at least 1 mm. This allows one or more vibration damping units 4 to perform vibration damping operations appropriately, making it possible to appropriately suppress vibrations in the vertical direction (Z direction).

[0273] A gap of 2 mm or more is provided between each of the one or more vibration damping units 4 and the reinforcing member 5. This further prevents contact between the one or more vibration damping units 4 and the reinforcing member 5. As a result, the vibration damping function of the one or more vibration damping units 4 through vibration damping action can be fully utilized.

[0274] The following points can be noted as features of the reinforcing member 5, which is constructed using the truss structure shown in Figure 1, and the reinforcing member 5, which is constructed using topology optimization as shown in Figure 18. In other words, the reinforcing member 5 shown in Figures 1 and 18 is connected to either the first support member 2 or the second support member 3 and includes a pair of two oblique frame members that extend obliquely with respect to the vertical direction (Z direction) so as to be symmetrical with respect to the reference line RL.

[0275] In the reinforcing member 5, which is composed of a truss structure as shown in Figure 1, pairs of two diagonal frame members 27 are configured to extend diagonally downward from the left and right positions of the first connection reference position 9a, so as to be symmetrical with respect to the reference line RLa. Similarly, for each of the first connection reference positions 9b and 9c, pairs of two diagonal frame members 27 are configured to extend diagonally downward, so as to be symmetrical with respect to the reference lines RLb and RLcc, respectively.

[0276] Furthermore, in the reinforcing member 5 shown in Figure 1, pairs of diagonal frame members 27 are configured to extend diagonally upward from the left and right positions of the second connection reference position 10a, so as to be symmetrical with respect to the reference line RLa. Similarly, for each of the second connection reference positions 10b and 10c, pairs of diagonal frame members 27 are configured to extend diagonally upward so as to be symmetrical with respect to the reference lines RLb and RLc, respectively.

[0277] The reinforcing member 5, configured by topology optimization as shown in Figure 18, consists of a left frame member 25a, a right frame member 25b, and three intermediate frame members 25c to 25e.

[0278] Reinforcement members 5 are configured symmetrically with respect to each of the reference lines RLa to RLd in the region between the left frame member 25a and the left intermediate frame member 25c, the region between the left intermediate frame member 25c and the central intermediate frame member 25d, the region between the central intermediate frame member 25d and the right intermediate frame member 25e, and the region between the right intermediate frame member 25e and the right frame member 25b.

[0279] Focusing on the portion of the reinforcing member 5 that is connected to the first support member 2 and the third support member 3 in each of the said regions, it can be seen that there are pairs of diagonal frame members that extend diagonally with respect to the vertical direction (Z direction) so as to be symmetrical with respect to the reference line RL.

[0280] For example, consider the regions 44a and 44b circled in Figure 18. The portion of the reinforcing member 5 within region 44a and the portion within region 44b are configured to be symmetrical with respect to the reference line RLa. Therefore, for each frame member included in region 44a, there exists a frame member in region 44b that is symmetrical with respect to the reference line RLa. These pairs of frame members are connected to either the first support member 2 or the second support member 3, and correspond to a pair of diagonal frame members that extend diagonally with respect to the vertical direction (Z direction) so as to be symmetrical with respect to the reference line RL.

[0281] A truss structure may be realized with a configuration different from that shown in Figure 1. Furthermore, topology optimization may result in a configuration different from that shown in Figure 18. In any case, if there is at least one pair of diagonal frame members connected to either the first support member 2 or the second support member 3, and extending diagonally with respect to the vertical direction (Z direction) so as to be symmetrical with respect to the reference line RL, then the reinforcing member 5 can be said to possess one of the features of the present invention. Of course, this feature is merely one feature and is not an essential component for constructing the reinforcing member 5 according to the present invention.

[0282] [Internal reinforcing member] Figure 19 is a schematic diagram showing another configuration example of the vibration damping unit 4. In the vibration damping unit 4 shown in Figure 19, internal reinforcing members 39 are provided for each of the first vibration damping core unit 12 and the second vibration damping core unit 13. The internal reinforcing members 39 are members that connect adjacent rotating members 15(17).

[0283] In the example shown in Figure 19, the first vibration-damping core unit 12 is equipped with a first internal reinforcing member 39a that connects the first rotating member 15a and the second rotating member 15b to each other, and a second internal reinforcing member 39b that connects the third rotating member 15c and the fourth rotating member 15d to each other.

[0284] In the example shown in Figure 19, the second vibration-damping core unit 13 is equipped with a third internal reinforcing member 39c that connects the fifth rotating member 17 and the sixth rotating member 17b to each other, and a fourth internal reinforcing member 39d that connects the seventh rotating member 17c and the eighth rotating member 17d to each other.

[0285] When viewed from the depth direction (Y direction), each of the first to fourth internal reinforcing members 39a to 39d has a crank shape.

[0286] The first internal reinforcing member 39a has a first base portion 40a extending in the left-right direction (X direction) from the position of the lower end of the third side portion 16c-1 of the first rotating member 15a, a second base portion 40b extending in the left-right direction (X direction) from the position of the upper end of the third side portion 16c-2 of the second rotating member 15b, and a connecting portion 40c extending in the up-down direction (Z direction) and connecting the first base portion 40a and the second base portion 40b.

[0287] The fourth internal reinforcing member 39d, positioned between the seventh rotating member 17c and the eighth rotating member 17d of the second vibration damping core unit 13, has the same configuration as the first internal reinforcing member 39a and includes a first base portion 40a, a second base portion 40b, and a connecting portion 40c.

[0288] The second internal reinforcing member 39b has a third base portion 40d extending in the left-right direction (X direction) from the position of the upper end of the third side portion 16c-3 of the third rotating member 15c, a fourth base portion 40e extending in the left-right direction (X direction) from the position of the lower end of the third side portion 16c-4 of the fourth rotating member 15d, and a connecting portion 40f extending in the up-down direction (Z direction) and connecting the third base portion 40d and the fourth base portion 40e.

[0289] The third internal reinforcing member 39c, positioned between the fifth rotating member 17a and the sixth rotating member 17b of the second vibration damping core unit 13, has the same configuration as the second internal reinforcing member 39b and includes a third base portion 40d, a fourth base portion 40e, and a connecting portion f.

[0290] By arranging the crank-shaped internal reinforcing member 39 in this manner, it is possible to improve the rigidity of the vibration damping structure 1. In particular, it is possible to improve the rigidity of the first vibration damping core unit 12 and the third vibration damping core unit 13.

[0291] The configuration shown in Figure 19 can also be described as a configuration in which reinforcing members are placed within the opening 22b extending in the vertical direction (Z direction) of the first vibration damping core unit 12 and within the opening 23b extending in the vertical direction (Z direction) of the second vibration damping core unit 13.

[0292] This improves the rigidity of the vibration-damping structure 1 in the vertical direction (Z direction). For example, the vibration-damping structure 1 may be used in situations where a load acts on the lower side in the vertical direction (Z direction). For example, the vibration-damping structure 1 may be used as a beam in the underfloor or ceiling, and positioned to support the load in the vertical direction (Z direction).

[0293] In such cases, a crank-shaped internal reinforcing member 39, as illustrated in Figure 19, is constructed within the openings 22b and 23b. This effectively prevents the vibration-damping structure 1 from bending or twisting due to loads from above. As a result, it can fully perform its function as a beam.

[0294] Furthermore, the crank-shaped internal reinforcing member 39 is advantageous in improving the rigidity of the vibration damping unit 4 without affecting the vibration damping mechanism caused by the vibration damping operation of the vibration damping unit 4. Of course, a shape other than the crank shape may be used for the internal reinforcing member 39.

[0295] Of course, internal reinforcing members may be configured within the opening 22a extending in the left-right direction (X direction) of the first vibration damping core unit 12, and within the opening 23a extending in the left-right direction (X direction) of the second vibration damping core unit 13. This makes it possible to improve rigidity in the left-right direction (X direction).

[0296] [R-chamfering (filleting)] Figures 20 and 21 are schematic diagrams showing other configuration examples of the reinforcing member 5. In the vibration damping unit 4 shown in Figures 20 and 21, R-chamfered portions (filleted portions) 46 are formed at the connection points between the first support member 2 and the second support member 3 and the reinforcing member 5, as well as within the reinforcing member 5. The R-chamfered portions 46 are formed by performing R-chamfering (filleting).

[0297] In the example shown in Figure 20, the reinforcing member 5 is constructed as a truss structure. Specifically, the reinforcing member 5 has multiple frame members, including diagonal frame members 27 (bracing members) that extend diagonally with respect to the vertical direction (Z direction). More specifically, the multiple frame members include vertical frame members 25 (left frame member 25a, intermediate frame member 25c) extending in the vertical direction (Z direction), horizontal frame members 26 (26a, 26b) extending in the left-right direction (X direction), and diagonal frame members 27 (27a to 27h).

[0298] The R-chamfered portion 46 is configured as the connection portion between the first support member 2 and the plurality of frame members, the connection portion between the second support member 3 and the plurality of frame members, and the connection portion between frame members included in the plurality of frame members.

[0299] In the example shown in Figure 20, four R-chamfered sections 46a are formed at the connection point between the first support member 2 and the diagonal frame members 27 (27a and 27b). Additionally, two R-chamfered sections 46b are formed at the connection point between the first support member 2 and the vertical frame members 25 (left frame member 25a, intermediate frame member 25c).

[0300] Four rounded chamfered sections 46c are formed at the connection point between the second support member 3 and the diagonal frame members 27 (27g and 27h). Additionally, two rounded chamfered sections 46d are formed at the connection point between the second support member 3 and the vertical frame members 25 (left frame member 25a, intermediate frame member 25c).

[0301] Four rounded chamfered sections 46e are formed at the connection point between the left frame member 25a and the diagonal frame members 27 (27a, 27c, 27e, 27g). Additionally, four rounded chamfered sections 46f are formed at the connection point between the intermediate frame member 25c and the diagonal frame members 27 (27b, 27d, 27f, 27h).

[0302] Four rounded chamfers 46g are formed at the connection points between the horizontal frame members 26 (26a and 26b) and the vertical frame members 25 (left frame member 25a, intermediate frame member 25c). Additionally, four rounded chamfers 46h are formed at the connection points between the horizontal frame members 26 (26a and 26b) and the diagonal frame members 27 (27c to 27f).

[0303] Four R-chamfered sections 46i are formed at the connection points between the diagonal frame members 27 (the connection points between 27a and 27c, 27b and 27d, 27e and 27g, and 27f and 27h).

[0304] In the example shown in Figure 21, the reinforcing member 5 is composed of a plate-shaped member 33. The R-chamfered portion 46 is made up of at least one of the connection portion between the first support member 2 and the plate-shaped member 33, the connection portion between the second support member 3 and the plate-shaped member 33, and the corner portion formed on the end face (side surface) of the plate-shaped member 33.

[0305] In the example shown in Figure 21, two R-chamfered portions 46j are formed at the connection point between the first support member 2 and the plate-shaped member 33. Additionally, two R-chamfered portions 46k are formed at the connection point between the second support member 3 and the plate-shaped member 33.

[0306] Four rounded chamfered portions 46l are formed at the corners of the end faces of the plate-shaped member 33, which are the opposing surfaces 47a and 47b facing the vibration damping unit 4.

[0307] As illustrated in Figures 20 and 21, by forming R-chamfered portions 46 at the connection points of each member and at the corners of the end faces of plate-shaped members, stress concentration can be suppressed, and damage to the members can be prevented. Therefore, the rigidity of the vibration-damping structure 1 can be improved.

[0308] All of the R-chamfered portions 46 shown in Figures 20 and 21 may be formed, or only some of the chamfered portions 46 may be formed. For example, it is possible to form an R-chamfered portion 46 in only one place.

[0309] In Figures 1, 17, 20, and 21, etc., the area surrounding one or more vibration damping units 4 between the first support member 2 and the second support member 3, i.e., the area that constitutes the reinforcing member 5, is defined as the reinforcement target area. Along the vertical direction (Z direction), greater stress is generated in parts where the size of the cross section (cross section when cut in the XY plane) perpendicular to the vertical direction (Z direction) of the reinforcement target area changes significantly.

[0310] In the examples shown in Figures 20 and 21, the portion of the reinforcing member 5 that is at the same position as the center CP1 (CP2) of the first vibration-damping core unit 12 (second vibration-damping core unit 13) in the vertical direction (Z direction) is a portion where the change in the size of the cross-section perpendicular to the vertical direction (Z direction) is large, resulting in large stresses. Therefore, constructing the R-chamfered portion 46i shown in Figure 20 and the R-chamfered portion 46l shown in Figure 21 is advantageous in preventing damage due to stress concentration.

[0311] In this embodiment, the radius of the R-chamfered portion 46 is designed to be 2 mm or more. This makes it possible to sufficiently suppress stress concentration. However, the R-chamfered portion 46 may be configured to have a radius smaller than 2 mm, although this value is not limited to this.

[0312] In the vibration damping structure 1 according to this embodiment, one or more vibration damping units 4 are connected between the first support member 2 and the second support member 3. Each of the one or more vibration damping units 4 includes a first vibration damping core unit 12 and a second vibration damping core unit 13.

[0313] The first vibration-damping core unit 12 is connected to the first support member 2 via the first and second hinges 20a and 20b, and the second vibration-damping core unit 13 is connected to the second support member 3 via the fifth and sixth hinges 20e and 20f. Furthermore, the first vibration-damping core unit 12 and the second vibration-damping core unit 13 are connected to each other via the ninth to twelfth hinges 20i to 20l.

[0314] The first vibration-damping core unit 12 has first to fourth rotating members 15a to 15d. Of these, the first rotating member 15a and the third rotating member 15c are connected to each other via a third hinge 20c. The second rotating member 15b and the fourth rotating member 15d are connected to each other via a fourth hinge 20d.

[0315] The second vibration-damping core unit 13 has fifth to eighth rotating members 17a to 17d. Of these, the fifth rotating member 17a and the seventh rotating member 17c are connected to each other via the seventh hinge 20g. The sixth rotating member 17b and the eighth rotating member 17d are connected to each other via the eighth hinge 20h.

[0316] The positions of the first to twelfth hinges 20a to 20l are appropriately set when viewed from the vertical direction (Z direction), as described above.

[0317] When vertical vibrations (in the Z-direction) act on the first support member 2 and the second support member 3, each rotating member 15 (17) rotates around the hinge 20. The connection between the first vibration-damping core unit 12 and the second vibration-damping core unit 13 is displaced in a direction that cancels out the vertical vibrations (in the Z-direction) acting on the first support member 2 and the second support member 3. This makes it possible to suppress the vibrations acting on the first support member 2 and the second support member 3. As a result, a high vibration-damping function can be achieved.

[0318] This paper examines vibration damping methods, such as those employing damping mechanisms like dampers or using damping materials like sponges. For example, adding a damping mechanism often leads to an increase in mass, making the object to be vibration-damped heavier. Furthermore, since damping materials are porous or have a structure where the molecules constituting the material are not sufficiently bonded but merely entangled, there is a problem of reduced strength in the parts where damping materials are used. In other words, achieving both lightweight construction and high strength while providing vibration damping functionality is a difficult challenge to solve.

[0319] For example, the technology described in Patent Document 1 above is based on a cantilever beam structure, in which the vibrating beam is supported only on one side, making the dynamic vibration absorber itself brittle, and because the beam is suspended in a hollow structure, it does not contribute to the rigidity of the member.

[0320] The technology described in Patent Document 2 has a structure in which the resonant part containing the weight floats hollow away from the member, and therefore does not contribute to the rigidity of the member. Furthermore, since the resonant part that does not contribute to rigidity occupies more than half the volume of the member, the rigidity of the sound insulation material becomes low.

[0321] In the vibration damping structure 1 related to this technology, a vibration damping unit 4 that performs vibration suspension is positioned between the first support member 2 and the second support member 3. Therefore, it is not a so-called one-handed structure, but rather the vibration damping unit 4 is supported on both sides, resulting in high rigidity of the vibration damping structure 1.

[0322] By constructing the reinforcing member 5 using a truss structure or by topology optimization, it is possible to realize a reinforcing member 5 that is advantageous in terms of weight reduction and rigidity of the vibration damping structure 1.

[0323] Furthermore, since the resonance frequency of the vibration damping unit 4 can be easily adjusted in this vibration damping structure 1, the frequency attenuated can be easily controlled. For example, it is possible to easily realize a vibration damping structure 1 that can dampen low-frequency vibrations of 100 Hz or less.

[0324] [Vibration damping device] A vibration damping device having a vibration damping structure 1 according to the present invention will be described. The vibration damping device corresponds to one embodiment of a device incorporating the vibration damping structure according to the present invention.

[0325] Figure 22 is a schematic diagram showing a general configuration example of a vibration damping device 50 according to one embodiment of the present invention. In Figure 22, the internal configuration of the vibration damping structure 1 is simplified, and the vibration damping unit 4 (first vibration damping core unit 12, second vibration damping core unit 13, hinge 20) is shown in a simplified manner.

[0326] The vibration damping device 50 comprises one or more vibration damping structures 1 and is connected between a first member 51 and a second member 52. The first member 51 and the second member 52 are connected directly or indirectly to each of the one or more vibration damping structures 1 via other members.

[0327] Each of the one or more vibration damping structures 1 is connected to a first member 51 such that a predetermined position of the first support member 2 becomes a first vibration application point VA1, and is connected to a second member 52 such that a position of the first support member 2 spaced apart from the first vibration application point VA1 becomes a second vibration application point VA2.

[0328] The first vibration application point VA1 is the position where vertical vibration (in the Z direction) is input when vertical vibration (in the Z direction) occurs from the first member 51. In other words, the position that becomes the vibration input point VI (see Figure 4, etc.) when the first member 51 vibrates vertically (in the Z direction) becomes the first vibration application point VA1.

[0329] The first member 51 is connected to the vibration damping structure 1 such that a predetermined position of the first support member 2 becomes the first vibration application point VA1, that is, when vibration occurs from the first member 51 in the vertical direction (Z direction), that position becomes the vibration input point VI.

[0330] The second vibration application point VA2 is the position where vertical vibration (in the Z direction) is input when vertical vibration (in the Z direction) occurs from the second member 52. In other words, the position that becomes the vibration input point VI (see Figure 4, etc.) when the second member 52 vibrates vertically (in the Z direction) becomes the second vibration application point VA2.

[0331] The second member 52 is connected to the vibration damping structure 1 such that the second vibration point VA2 is located at a position spaced apart from the first vibration point VA1 of the first support member 2, that is, when vibration occurs in the vertical direction (Z direction) from the second member 52, the vibration input point VI is located at a position spaced apart from the first vibration point VA1.

[0332] In the example shown in Figure 22, the vibration damping device 50 is further provided with a first connecting mechanism 53 and a second connecting mechanism 54. The first connecting mechanism 53 connects the first member 51 to each of the one or more vibration damping structures 1 so that when vibration occurs in the vertical direction (Z direction) from the first member 51, the vibration generated from the first member 51 is input to the first vibration application point VA1. The second connecting mechanism 54 connects the second member 52 to each of the one or more vibration damping structures 1 so that when vibration occurs in the vertical direction (Z direction) from the second member 52, the vibration generated from the second member 52 is input to the second vibration application point VA2. The specific configurations of the first connection mechanism 53 and the second connection mechanism 54 are not limited, and any configuration may be adopted.

[0333] In the example shown in Figure 22, the vibration damping structure 1 and the first member 51 are connected such that the left end 2a of the first support member 2 becomes the first vibration application point VA1. The vibration damping structure 1 and the second member 52 are connected such that the right end 2b of the first support member 2 becomes the second vibration application point VA2.

[0334] Setting a first vibration point VA1 and a second vibration point VA2 for the first support member 2 is equivalent to setting a first vibration point VA1 and a second vibration point VA2 for the second support member 3, and setting a first vibration point VA1 and a second vibration point VA2 for both the first support member 2 and the second support member 3.

[0335] As shown in Figure 22, when the first member 51 acts as a vibration source and vibrates in the vertical direction (Z direction), the vertical vibration (Z direction) is input to the first vibration application point VA1. As the input vibration acts on the first support member 2 and the second support member 3, the four vibration damping units 4 perform vibration damping operations. As a result, the vertical vibration (Z direction) is damped, and the vertical vibration (Z direction) is sufficiently suppressed at the second vibration application point VA2. As a result, it is possible to sufficiently suppress the transmission of the vertical vibration (Z direction) generated in the first member 51 to the second member 52. In this case, the second vibration application point VA2 can also be considered as the vibration output point VO (see Figure 4, etc.).

[0336] When the second member 52 acts as a vibration source and vibrates in the vertical direction (Z direction), the vertical vibration (Z direction) is input to the second vibration application point VA2. As the input vibration acts on the first support member 2 and the second support member 3, the four vibration damping units 4 perform vibration damping operations. As a result, the vertical vibration (Z direction) is damped, and the vertical vibration (Z direction) is sufficiently suppressed at the first vibration application point VA1. As a result, it is possible to sufficiently suppress the transmission of vertical vibration (Z direction) generated in the second member 52 to the first member 52. In this case, the first vibration application point VA1 can also be considered as the vibration output point VO (see Figure 4, etc.).

[0337] By arranging the vibration damping device 50 in this manner, it becomes possible to sufficiently suppress the transmission of vibrations in the vertical direction (Z direction) between the first member 51 and the second member 52, thereby exhibiting a high vibration damping function. One way to use the vibration damping device 50 is to place it between a member that is a vibration source and a member to which it is not desirable to transmit vibrations generated by that vibration source. However, it is not limited to this, and another method is to place the vibration damping device 50 between two members, each of which could be a vibration source, in such a way that vibrations generated by each member are not transmitted.

[0338] Furthermore, the vibration damping device 50 is not limited to being placed between two members, but can also be placed for three or more members. In this case, each vibration damping structure 1 should be connected to at least two of the three or more members such that the positions of the first support member 2 spaced apart from each other become the first vibration application point VA1 and the second vibration application point VA2. Such a method of connecting the vibration damping structure 1 to the first member 51 and the second member 52 can also be called the connection method according to this technology. Of course, the connection method according to this technology may also be implemented for any two of the three or more members.

[0339] Figures 23 to 25 are schematic diagrams showing other configuration examples of the vibration damping device 50. Figure 23 is a perspective view of the vibration damping device 50, taken from the upper right of the front side at an oblique angle. Figure 24 shows the vibration damping device 50 as viewed from the depth direction (Y direction). Figure 25 is a side view of the vibration damping device 50 as seen from the left side (negative side of the X-axis).

[0340] The vibration damping device 50 includes four vibration damping structures 1, an upper surface member 55, a lower surface member 56, upper column members 57 (57a to 57d), lower column members 58 (58a to 58d), and a support leg member 59.

[0341] The upper member 55 is a plate-shaped member that has a rectangular shape when viewed from the vertical direction (Z direction), and is positioned perpendicular to the vertical direction (Z direction). The lower member 56 is a plate-shaped member having a shape substantially the same as that of the upper member 55, and is positioned opposite the upper member 55 along the vertical direction (Z direction). When viewed from the vertical direction (Z direction), the upper members 55 are positioned in a positional relationship where they overlap each other. The support leg members 59 are positioned at the four lower corners of the lower surface member 56 and contact the installation surface to support the vibration damping device 50.

[0342] In this embodiment, the first object is connected to the upper member 55. Therefore, the upper member 55 functions as part of the first connecting mechanism 53. More specifically, the first connecting mechanism 53 is composed of the upper member 55, the upper column member 57, and the connecting member 60 connected to the upper column member 57.

[0343] In this embodiment, the mounting surface that contacts the support leg member 59 corresponds to the second object. Therefore, the lower surface member 56 and the support leg member 59 function as part of the second connecting mechanism 54. More specifically, the second connecting mechanism 54 is composed of the lower surface member 56, the lower side column member 58, and the connecting member 60 connected to the lower side column member 58. Note that another object different from the mounting surface may be connected to the lower surface member 56 as the second object.

[0344] The vibration damping device 50 according to this embodiment makes it possible to sufficiently suppress the transmission of vibrations in the vertical direction (Z direction) between an object placed on the upper surface member 55 and the installation surface.

[0345] The four vibration damping structures 1 are arranged in the space between the upper member 55 and the lower member 56, in a positional relationship that overlaps along the depth direction (Y direction). As shown in Figure 24, when viewed from the depth direction (Y direction), the left frame member 25a of each vibration damping structure 1 is positioned so as to overlap each other on the left side of the space between the upper member 55 and the lower member 56. The right frame member 25b of each vibration damping structure 1 is positioned so as to overlap each other on the right side of the space between the upper member 55 and the lower member 56. Of course, when viewed from the depth direction (Y direction), the first support member 2, the second support member 3, and each vibration damping unit 4 of each vibration damping structure 1 are also arranged to overlap each other.

[0346] The upper column member 57 is a plate-shaped member with its longer side oriented in the vertical direction (Z direction), and its upper end is connected to the upper surface member 55. As shown in Figure 25, the lower end of the upper column member 57 is not connected to the lower surface member 56, and a gap is formed between the upper column member 57 and the lower surface member 56.

[0347] The lower column member 58 is a plate-shaped member having a shape substantially the same as the upper column member 57, and its lower end is connected to the lower surface member 56. As shown in Figure 25, the upper end of the lower column member 58 is not connected to the upper surface member 55, and a gap is formed between the lower column member 58 and the upper surface member 55.

[0348] As shown in Figures 23 to 25, each of the four vibration damping structures 1 is connected to the left frame member 25a by either the upper column member 57 or the lower column member 58. The other of the upper column member 57 or the lower column member 58 is connected to the right frame member 25b. In other words, each of the four vibration damping structures 1 is connected by a pair of (upper column member 57, lower column member 58) sandwiching it from both sides. In this embodiment, the upper column member 57 and the lower column member 58 are connected to the vibration damping structure 1 via the connecting member 60.

[0349] The four vibration damping structures 1 are described as vibration damping structures 1a to 1d, in order from the front. In this embodiment, the upper column member 57a is connected to the left frame member 25a of vibration damping structure 1a, which is located on the frontmost side (negative side of the Y-axis) in the depth direction (Y-direction). The lower column member 58a is connected to the right frame member 25b.

[0350] Accordingly, as shown in Figure 24, the vibration damping structure 1a is connected to the upper member 55 via the upper column member 57a such that the position of the left end 2a of the first support member 2 becomes the first vibration application point VA1. The vibration damping structure 1a is also connected to the lower member 56 via the lower column member 58a such that the position of the right end 2b of the first support member 2 becomes the second vibration application point VA2.

[0351] The lower column member 58b is connected to the left frame member 25a of the vibration damping structure 1b, which is positioned second from the front in the depth direction (Y direction). The upper column member 57b is connected to the right frame member 25b.

[0352] Therefore, the vibration damping structure 1b is connected to the lower surface member 56 via the lower side column member 58b such that the position of the left end 2a of the first support member 2 becomes the second vibration application point VA2. In addition, the vibration damping structure 1b is connected to the upper surface member 55 via the upper side column member 57b such that the position of the right end 2b of the first support member 2 becomes the first vibration application point VA1.

[0353] The upper column member 57c is connected to the left frame member 25a of the vibration damping structure 1c, which is the third structure from the front in the depth direction (Y direction). The lower column member 58c is connected to the right frame member 25b.

[0354] Therefore, the vibration damping structure 1c is connected to the upper member 55 via the upper column member 57c such that the position of the left end 2a of the first support member 2 becomes the first vibration application point VA1. The vibration damping structure 1c is also connected to the lower member 56 via the lower column member 58c such that the position of the right end 2b of the first support member 2 becomes the second vibration application point VA2.

[0355] The lower column member 58d is connected to the left frame member 25a of the vibration damping structure 1d, which is located at the innermost part in the depth direction (Y direction). The upper column member 57d is connected to the right frame member 25b.

[0356] Therefore, the vibration damping structure 1d is connected to the lower surface member 56 via the lower side column member 58d such that the position of the left end 2a of the first support member 2 becomes the second vibration application point VA1. In addition, the vibration damping structure 1d is connected to the upper surface member 55 via the upper side column member 57d such that the position of the right end 2b of the first support member 2 becomes the first vibration application point VA1.

[0357] Therefore, in this vibration damping device 50, when viewed from the depth direction (Y direction), vibration damping structures 1 (1a and 1c) are arranged alternately along the depth direction (Y direction): one is connected to the upper member 55 such that the position of the left end 2a of the first support member 2 becomes the first vibration application point VA1, and the other is connected to the lower member 56 such that the position of the right end 2b opposite to the left end 2a becomes the second vibration application point VA2; and the other is connected to the upper member 55 such that the position of the right end 2b of the first support member 2 becomes the first vibration application point VA1, and the other is connected to the lower member 56 such that the position of the left end 2a becomes the second vibration application point VA2.

[0358] As shown in Figure 25, on the left side of the vibration damping device 50, the upper column member 57a is positioned first from the front, with the upper column member 57 and the lower column member 58 arranged alternately. As shown in Figure 23, on the right side of the vibration damping device 50, the lower column member 58a is positioned first from the front, with the lower column member 58 and the upper column member 57 arranged alternately.

[0359] When vertical vibrations (in the Z direction) generated from the first member act on the upper member 55, vertical vibrations (in the Z direction) are input to the left frame member 25a of the nearest vibration damping structure 1a, the right frame member 25b of the second vibration damping structure 1b, the left frame member 25a of the third vibration damping structure 1c, and the right frame member 25b of the furthest vibration damping structure 1d, via the upper column member 57a.

[0360] The three vibration damping units 4 of each vibration damping structure 1 perform vibration damping operations, thereby damping vibrations in the vertical direction (Z direction). Therefore, vibrations in the vertical direction (Z direction) are sufficiently suppressed in the right frame member 25b of the nearest vibration damping structure 1a, the left frame member 25a of the second vibration damping structure 1b, the right frame member 25b of the third vibration damping structure 1c, and the left frame member 25a of the furthest vibration damping structure 1d.

[0361] Therefore, vertical vibrations (in the Z-direction) acting on the lower surface member 56, which is connected via the lower column member 58, are sufficiently suppressed for the right frame member 25b of the nearest vibration damping structure 1a, the left frame member 25a of the second vibration damping structure 1b, the right frame member 25b of the third vibration damping structure 1c, and the left frame member 25a of the furthest vibration damping structure 1d. As a result, vertical vibrations (in the Z-direction) acting on the installation surface in contact with the four support leg members 59 connected below the lower surface member 56 are sufficiently suppressed.

[0362] This vibration damping device 50 makes it possible to sufficiently suppress the transmission of vertical (Z-direction) vibrations acting on the upper member 55 to the lower member 56, thereby exhibiting a high vibration damping function. As a result, it is possible to sufficiently suppress the transmission of vertical (Z-direction) vibrations generated from the vibration source connected to the upper member 55 to the mounting surface of the lower member 56 that abuts against the support leg member 59 on which it is installed.

[0363] Furthermore, even when vertical vibrations (in the Z direction) originating from the installation surface act on the lower surface member 56 via the support leg member 59, a high vibration damping function can be achieved, and it is possible to sufficiently suppress the transmission of vertical vibrations (in the Z direction) to objects connected to the upper surface member 55.

[0364] When the upper member 55 or the lower member 56 vibrates in the vertical direction (Z direction), the vibration damping structure 1 that receives vibration input from the left side and the vibration damping structure 1 that receives vibration input from the right side are arranged alternately along the depth direction (Y direction), making it possible to dampen vibrations in a balanced and stable manner.

[0365] In the vibration damping device 50 shown in Figures 23 to 25, the three vibration damping units 4 of each of the four vibration damping structures 1 correspond to one embodiment of multiple vibration damping units arranged in a line along the left-right direction (X direction) perpendicular to the vertical direction (Z direction).

[0366] The four vibration damping structures 1 correspond to one embodiment of multiple vibration damping structures arranged so as to be aligned along the depth direction (Y direction) which is perpendicular to the vertical direction (Z direction) and the left-right direction (X direction), and so as to be aligned when viewed from the depth direction (Y direction) in the left-right direction (X direction) with the positions of the two ends (left end 2a and right end 2b) aligned.

[0367] The vibration damping structures 1a and 1c are vibration damping structures connected to an upper member 55 such that one end (left end 2a) of the first support member 2 in the left-right direction (X direction) becomes the first vibration application point VA1, and the other end (right end 2b) of the first support member 2 in the left-right direction (X direction) becomes the second vibration application point VA2, and correspond to one embodiment of the "first vibration damping structure". The left end 2a corresponds to one embodiment of the "end on the first side", and the right end 2b corresponds to one embodiment of the "second end on the opposite side from the first side".

[0368] The vibration damping structures 1b and 1d are vibration damping structures connected to an upper member 55 such that one end (right end 2b) of the first support member 2 in the left-right direction (X direction) becomes the first vibration application point VA1, and the other end (left end 2a) of the first support member 2 in the left-right direction (X direction) becomes the second vibration application point VA2, and correspond to one embodiment of the "second vibration damping structure". The left end 2a corresponds to one embodiment of the "end on the first side", and the right end 2b corresponds to one embodiment of the "second end on the opposite side from the first side".

[0369] Figures 26 and 27 are schematic diagrams showing other configuration examples of the vibration damping device 50. Figure 26 shows the vibration damping device 50 as viewed from the depth direction (Y direction). Figure 27 is a schematic diagram showing an example of the installation of multiple vibration damping devices 50.

[0370] As shown in Figure 26, the vibration damping device 50 according to this embodiment includes a vibration damping structure 1, an upper support member 62, a connecting member 63, and a support leg member 64.

[0371] As shown in Figure 27, the vibration damping structure 1 is composed of block shapes with a large size in the depth direction (Y direction). Therefore, when viewed from the vertical direction (Z direction), the first support member 2 and the second support member 3 are rectangular plate-shaped members. In addition, eight vibration damping units 4 are arranged in a row between the first support member 2 and the second support member 3, along the left-right direction (X direction).

[0372] As shown in Figure 27, the connecting member 63 is an elongated plate-shaped member extending along the depth direction (Y direction) and is positioned at the center of the upper surface of the first support member 2 in the left-right direction (X direction). The upper support member 62 is a plate-shaped member that is rectangular when viewed from the up-down direction (Z direction) and is connected above the connecting member 63. When viewed from the up-down direction (Z direction), the center positions of the first support member 2, the connecting member 63, and the upper support member 62 in the left-right direction (X direction) coincide with each other.

[0373] As shown in Figure 27, vibration damping devices 50 are arranged at regular intervals along both the left-right direction (X direction) and the depth direction (Y direction). In this embodiment, 6 vibration damping devices 50 are arranged along the left-right direction (X direction) and 6 along the depth direction (Y direction), for a total of 36 devices. Of course, the number of vibration damping devices 50 to be arranged is not limited.

[0374] The 36 vibration damping devices 50 are arranged inside the double-floor structure, and the floor member 66 is positioned on the upper support member 62. In each vibration damping device 50, the floor member 66 corresponds to the first member. Therefore, the connecting member 63 and the upper support member 62 function as the first connecting mechanism 54.

[0375] The support leg members 64 are positioned at the four lower corners of the second support member 3 and contact the base member of the double floor structure to support the vibration damping device 50. In this embodiment, the base member that contacts the support leg members 64 corresponds to the second object. Therefore, the support leg members 64 function as part of the second connecting mechanism 54.

[0376] As shown in Figure 26, the vibration damping structure 1 is connected to the floor member 66 by a first connecting mechanism 53 such that the central position of the first support member 2 in the left-right direction (X direction) becomes the first vibration application point VA1. The vibration damping structure 1 is also connected to the base member via a second connecting mechanism 54 such that the positions of both ends (left end 2a and right end 2b) of the first support member 2 in the left-right direction (X direction) become the second vibration application point VA2. Furthermore, the vibration damping structure 1 and the base member may be connected such that at least one end of the left end 2a and the right end 2b becomes the second vibration application point VA2.

[0377] When the floor member 66 vibrates in the vertical direction (Z direction), vertical vibrations are input to the first vibration application point VA1 of the vibration damping structure 1. The vibration suppression action of the four vibration damping units 4 on the left side of the vibration damping structure 1 sufficiently suppresses vertical vibrations in the vertical direction (Z direction) acting at the second vibration application point VA2 at the left end of the vibration damping structure 1. In addition, the vibration suppression action of the four vibration damping units 4 on the right side of the vibration damping structure 1 sufficiently suppresses vertical vibrations in the vertical direction (Z direction) acting at the second vibration application point VA2 at the right end of the vibration damping structure 1.

[0378] Therefore, vertical vibrations (in the Z-direction) acting on the base member that is in contact with the four support leg members 64 connected to the left and right ends of the second support member 3 of the vibration damping structure 1 are sufficiently suppressed.

[0379] This vibration damping device 50 makes it possible to sufficiently suppress the transmission of vertical (Z-direction) vibrations generated from the upper floor member 66 to the lower base member in a double-floor structure, thereby exhibiting a high vibration damping function. Furthermore, even when vertical (Z-direction) vibrations are generated from the lower base member, a high vibration damping function can be exhibited, and it is possible to sufficiently suppress the transmission of vertical (Z-direction) vibrations to the upper floor member 66.

[0380] For example, in apartment buildings and other multi-unit dwellings, low-frequency vibrations such as 60Hz often pose a problem regarding vibrations (sound) originating from upper floors. Applying this vibration damping device 50 is highly effective in suppressing low-frequency vibrations.

[0381] <Other Embodiments> The present invention is not limited to the embodiments described above, and various other embodiments can be realized.

[0382] Figures 28 to 30 are schematic diagrams showing other configuration examples of the vibration damping structure 1. Figures 28 to 30 illustrate the first support member 2 as viewed from above in the vertical direction (Z direction). The vibration damping unit 4 is configured in the region FA demarcated by the dashed lines in the figures, extending towards the back of the page. The second support member 3 is designed to have the same shape as the first support member 2.

[0383] In the example shown in Figure 28, the first support member 2 is composed of six linear members 70 (70a to 70f) that extend radially from the center CP3 with the same length when viewed from the vertical direction (Z direction). The six linear members 70 are connected to each other at the center CP3.

[0384] The linear members 70a and 70d extend in opposite directions from the center CP3 along the depth direction (Y direction). The linear members 70b and 70e extend in opposite directions from the center CP3 along a direction that intersects the depth direction (Y direction) at a 60-degree counterclockwise angle. The linear members 70c and 70f extend in opposite directions from the center CP3 along a direction that intersects the depth direction (Y direction) at a 60-degree clockwise angle. Thus, the six linear members 70 are arranged at equal intervals with the center CP3 at a 60-degree angle. This shape can also be called an asterisk shape.

[0385] Three vibration damping units 4 are arranged along the vertical direction (Z direction) for each linear member 70. Therefore, in the vibration damping structure 1 shown in Figure 28, a total of 18 vibration damping units 4 are arranged.

[0386] In the example shown in Figure 29, the first support member 3 is composed of a circular member 71 that has a substantially circular shape when viewed from the vertical direction (Z direction). In the vibration damping structure 1 shown in Figure 29, twelve vibration damping units 4 are arranged along the vertical direction (Z direction).

[0387] In the example shown in Figure 30, the first support member 3 has a shape in which, when viewed from the vertical direction (Z direction), a straight member 72a extending in a direction that intersects the horizontal direction (X direction) at a 45-degree angle toward the rear, and a straight member 72b extending in a direction that intersects the horizontal direction (X direction) at a 45-degree angle toward the front, are alternately connected along the horizontal direction (X direction). The shape of the first support member 2 when viewed from the vertical direction (Z direction) can also be called a V-shaped concave-concave shape.

[0388] One vibration damping unit 4 is positioned along the vertical direction (Z direction) for each of the linear members 72a and 72b. Therefore, in the vibration damping structure 1 shown in Figure 30, a total of eight vibration damping units 4 are arranged.

[0389] In the vibration damping structure 1 shown in Figures 28 to 30, the first member 51 and the second member 52 are connected such that their positions are spaced apart from each other, becoming the first vibration application point VA1 and the second vibration application point VA2. This makes it possible to sufficiently suppress the transmission of vibrations in the vertical direction (Z direction) between the first member 51 and the second member 52.

[0390] For example, in the configuration shown in Figure 28, the first member 51 is connected from above so that the position of the center CP3 becomes the first vibration point V1. Then, the second object is connected from below so that the positions of the ends of the six linear members become the second vibration point VA2. Such a configuration can be adopted. Alternatively, the six second objects may be connected so that the positions of the ends of the six linear members become the second vibration point VA2.

[0391] Furthermore, when adjusting the resonant frequency of the vibration damping unit 4 based on the frequency of the vertical vibration (Z direction) to be damped, it may be advantageous to increase the number of vibration damping units 4 or to increase the size of each vibration damping unit 4. Also, it may be advantageous to increase the length (total length) of the first support member 3 when viewed from the vertical direction (Z direction).

[0392] On the other hand, there may be cases where the design of the vibration damping structure 1 is constrained, such as when the size of the space in which the vibration damping structure 1 is to be placed is limited. The vibration damping structure 1 according to this technology can be made into various shapes, as illustrated in Figures 28 and 29. Therefore, it is possible to respond flexibly to design constraints.

[0393] Furthermore, since the vibration damping structure 1 related to this technology can adopt various shapes, it is possible to flexibly accommodate various arrangement relationships between the first member (which may be multiple) and the second member (which may also be multiple).

[0394] Figure 31 is an enlarged view showing a magnified portion of the third hinge 20c. In the example shown in Figure 31, the third hinge 20c has a rounded chamfer 74 at the connection point with other members. Specifically, the rounded chamfer 74 is formed at the connection point of the third hinge 20c with the first rotating member 15a and at the connection point of the third hinge 20c with the third rotating member 15c.

[0395] This makes it possible to suppress stress concentration at the connection point between the third hinge 20c and the other members (first rotating member 15a, third rotating member 15c), thereby preventing damage. Consequently, it becomes possible to improve the rigidity of the vibration-damping structure 1.

[0396] For example, for each of the first hinge 20a, second hinge 20b, third hinge 20c, fourth hinge 20d, fifth hinge 20e, sixth hinge 20f, seventh hinge 20g, eighth hinge 20h, ninth hinge 20i, tenth hinge 20j, eleventh hinge 20k, and twelfth hinge 20l shown in Figure 3, an R-chamfered portion 74 may be provided at the connection point with other members. In other words, an R-chamfered portion 74 may be provided at the connection point with other members for all hinges.

[0397] The R-chamfered portion 74 may be provided only on hinges arbitrarily selected from the first to twelfth hinges 20a to 20l. Of course, the R-chamfered portion 74 may be provided on only one hinge. That is, the R-chamfered portion 74 may be provided on at least one of the first to twelfth hinges 20a to 20l.

[0398] Furthermore, in each hinge, the R-chamfered portion 74 may be formed on all connection parts with other members (for example, both ends in the vertical direction (Z direction)). However, it is not limited to this, and the R-chamfered portion 74 may be formed on only a part of the connection part with other members (for example, only one location).

[0399] For example, a hinge to which rotating members 15 (17) are connected at both ends may have an R-chamfered portion 74. Specifically, R-chamfered portions 74 may be provided at the connection portion of the third hinge 20c to the first rotating member 15a, the connection portion of the third hinge 20c to the third rotating member 15c, the connection portion of the fourth hinge 20d to the second rotating member 15b, the connection portion of the fourth hinge 20d to the fourth rotating member 15d, the connection portion of the seventh hinge 20g to the fifth rotating member 17a, the connection portion of the seventh hinge 20g to the seventh rotating member 17c, the connection portion of the eighth hinge 20h to the sixth rotating member 17b, and the connection portion of the eighth hinge 20h to the eighth rotating member 17d.

[0400] Of course, the first hinge 20a and the second hinge 20b connected to the first support member 2 may also be provided with R-chamfered portions 74. In other words, R-chamfered portions 74 may be provided at the connection portion of the first hinge 20a to the first support member 2 (connecting member 21a), the connection portion of the first hinge 20a to the first rotating member 15a, the connection portion of the second hinge 20b to the first support member 2 (connecting member 21a), and the connection portion of the second hinge 20b to the second rotating member 15b.

[0401] Furthermore, the fifth hinge 20e and the sixth hinge 20f connected to the second support member 2 may be provided with R-chamfered portions 74. In other words, R-chamfered portions 74 may be provided at the connection portion of the fifth hinge 20e to the second support member 3 (connecting member 21b), the connection portion of the fifth hinge 20e to the fifth rotating member 17a, the connection portion of the sixth hinge 20f to the second support member 3 (connecting member 21b), and the connection portion of the sixth hinge 20f to the sixth rotating member 17b.

[0402] By providing an R-chamfered portion 74 at the connection point between each hinge and other components, stress concentration can be suppressed, thereby preventing damage to the hinges. Consequently, the rigidity of the vibration-damping structure 1 can be improved. In this embodiment, the radius of the R-chamfered portion 74 is designed to be 1 mm or more. This makes it possible to sufficiently suppress stress concentration. However, the R-chamfered portion 74 may be configured to have a radius smaller than 1 mm, although this value is not limited to this.

[0403] In the above, a configuration in which a vibration damping drive member 14 is arranged as a vibration damping unit 4 has been described, as shown in Figure 3, etc. On the other hand, the vibration damping drive member 14 may not be arranged, and the ninth hinge 20i and the eleventh hinge 20k may be directly connected, and the tenth hinge 20j and the twelfth hinge 20l may be directly connected. Even in this case, it is possible to exert a vibration damping function by vibration damping operation in response to the vertical (Z direction) vibration of the first support member 2 and the second support member 3.

[0404] The configuration of the vibration damping unit 4 can be designed arbitrarily, as long as it is possible to perform vibration damping operations in response to the vertical (Z-direction) vibrations of the first support member 2 and the second support member 3. In other words, the shape of each rotating member 15(18) can be designed arbitrarily, as long as each rotating member 15(17) can perform rotational movements in response to the vertical (Z-direction) vibrations of the first support member 2 and the second support member 3 to exert a vibration damping function. For example, the shapes of each rotating member 15(17) may all be different.

[0405] Furthermore, the position of each hinge 20 when viewed from the vertical direction (Z direction) can also be arbitrarily designed. In the example shown in Figure 3, a configuration in which the hinges 20 are positioned at different locations in the left-right direction (X direction) is described as an example of arranging the hinges 20 at different locations when viewed from the vertical direction (Z direction). However, it is not limited to this, and a configuration in which the hinges 20 are positioned at different locations in the depth direction (Y direction) may also be adopted. In other words, any configuration can be adopted in which the two hinges connected to each rotating member 15 (17) are at different locations from each other when viewed from the vertical direction (Z direction).

[0406] As shown in Figure 2, it is also possible to achieve vibration damping functionality even in a configuration without reinforcing member 5. A configuration in which the first support member 2 and the third support member are connected is also possible. For example, the upper semicircular portion of a circular frame may function as the first support member 2, and the lower semicircular portion may function as the second support member 3. A single vibration damping unit 4 may have three or more vibration damping core units. That is, in addition to the first vibration damping core unit 12 and the second vibration damping core unit 13, a third vibration damping core unit, a fourth vibration damping core unit, and so on may be arranged in a single vibration damping unit 4. In this case, the first vibration damping core unit 12 may be connected to the first support member 2 via other vibration damping core units, or the second vibration damping core unit 13 may be connected to the second support member 3 via other vibration damping core units.

[0407] In the vibration damping device 50 shown in Figures 22 to 27, the vibration damping structure 1 is configured such that the vertical direction corresponding to the "first direction" is aligned with the vertical direction, and the first support member 2 is positioned above the second support member 3. However, it is not limited to this configuration, and the vibration damping structure 1 may be arranged so that the vertical direction corresponding to the "first direction" is aligned with any direction. For example, the vibration damping structure 1 may be positioned horizontally so that its vertical direction aligns with the horizontal direction. For example, four vibration damping structures 1 positioned horizontally may be connected to the support columns of a vibration isolation table positioned vertically, from four mutually orthogonal directions along the horizontal direction. This makes it possible to suppress the transmission of vibrations along the horizontal direction to the vibration isolation table, enabling highly accurate and precise work such as fine motor tasks and microscopic observations without any misalignment.

[0408] The vibration mechanism, first support member, second support member, vibration damping unit, first and second vibration damping core units, rotating member, hinge, reinforcing member, vibration damping device, and other components described with reference to the drawings are merely embodiments and can be arbitrarily modified without departing from the spirit of this technology. In other words, any other configuration for implementing this technology may be adopted.

[0409] In this disclosure, words such as "abbreviated," "almost," and "approximately" are used as appropriate to facilitate understanding of the explanation. However, there is no clear distinction defined between using and not using these words. In other words, in this disclosure, concepts that define shape, size, positional relationships, state, etc., such as "center," "central," "uniform," "equal," "same," "orthogonal," "parallel," "symmetrical," "extending," "axial," "cylindrical," "cylindrical shape," "ring shape," and "annular shape," include concepts such as "substantially centered," "substantially central," "substantially uniform," "substantially equal," "substantially the same," "substantially orthogonal," "substantially parallel," "substantially symmetrical," "substantially extending," "substantially axial," "substantially cylindrical," "substantially cylindrical shape," "substantially ring shape," and "substantially annular shape." For example, this includes states that fall within a predetermined range (e.g., a range of ±10%) based on criteria such as "perfectly centered," "perfectly central," "perfectly uniform," "perfectly equal," "perfectly the same," "perfectly orthogonal," "perfectly parallel," "perfectly symmetrical," "perfectly extending," "perfectly axial," "perfectly cylindrical," "perfectly cylindrical shape," "perfectly ring shape," and "perfectly annular shape." Therefore, even if words like "abbreviated," "almost," or "approximately" are not added, the concept may still include what could be expressed by adding such words. Conversely, when a state is expressed with words like "abbreviated," "almost," or "approximately," it does not necessarily mean that a complete state is excluded.

[0410] In this disclosure, expressions using "greater than A" such as "greater than A" and "less than A" are expressions that comprehensively include both concepts that include cases where something is equivalent to A and concepts that do not include cases where something is equivalent to A. For example, "greater than A" is not limited to cases where something is not equivalent to A, but also includes "greater than or equal to A". Similarly, "less than A" is not limited to "less than A", but also includes "less than or equal to A". When implementing this technology, you should appropriately adopt specific settings and other elements from the concepts included in "greater than A" and "less than A" so that the effects described above are achieved.

[0411] It is also possible to combine at least two of the feature features of the present technology described above. In other words, the various feature features described in each embodiment may be combined arbitrarily, regardless of the specific embodiment. Furthermore, the various effects described above are merely examples and not limiting, and other effects may also be exhibited. [Explanation of symbols]

[0412] CL1…The center of the first vibration damping core unit CL2…The center of the second vibration damping core unit RL…Reference line VA1…First point of application of vibration VA2...First point of application of vibration VI…Vibration input point VO... Vibration output point 2…First support member 3…Second support member 4…Vibration damping unit 5…Reinforcement member 9…First connection reference position 10...Second connection reference position 12…First vibration damping core unit 13…Second vibration damping core unit 14…Vibration damping drive member 15a~15d...1st to 4th rotating members 17a~17d...5th to 8th rotating members 20a~20l...1st to 12th hinges 27…Diagonal frame members (bracing members) 29... Weight (masu) 33... Plate-shaped member 39…Internal reinforcing member 46, 74...R chamfered section 47a, 47b... Opposing surfaces of plate-shaped members 50…Vibration damping device 51...First component 52...Second component 53...First connection mechanism 54...Second connection mechanism

Claims

1. First support member and A second support member is positioned opposite to the first support member along a first direction, One or more vibration damping units connected between the first support member and the second support member to suppress vibrations acting on the first support member and the second support member in the first direction, It is equipped with, Each of the one or more vibration damping units is A first rotating member connected to the first support member via a first hinge, A second rotating member connected to the first support member via a second hinge, A third rotating member is connected to the first rotating member via a third hinge positioned differently from the first hinge when viewed from the first direction, When viewed from the first direction, the fourth rotating member is connected to the second rotating member via a fourth hinge which is positioned differently from the second hinge. A first vibration-damping core unit having, A fifth rotating member connected to the second support member via a fifth hinge, A sixth rotating member connected to the second support member via a sixth hinge, A seventh rotating member is connected to the fifth rotating member via a seventh hinge, which is positioned differently from the fifth hinge when viewed from the first direction, When viewed from the first direction, the eighth rotating member is connected to the sixth rotating member via an eighth hinge which is positioned differently from the sixth hinge. A second vibration-damping core unit having Includes, The first vibration damping core unit and the second vibration damping core unit are, A ninth hinge, which is positioned differently from the third hinge when viewed from the first direction and connected to the third rotating member, A tenth hinge, which is positioned differently from the fourth hinge when viewed from the first direction and connected to the fourth rotating member, An eleventh hinge, which is positioned differently from the seventh hinge when viewed from the first direction and connected to the seventh rotating member, A 12th hinge, which is positioned differently from the 8th hinge when viewed from the first direction and connected to the 8th rotating member, They are connected to each other via Vibration-damping structure.

2. A vibration damping structure according to claim 1, Each of the one or more vibration damping units includes a vibration damping drive member connected to the third rotating member via the ninth hinge, the fourth rotating member via the tenth hinge, the seventh rotating member via the eleventh hinge, and the eighth rotating member via the twelfth hinge. Vibration-damping structure.

3. A vibration damping structure according to claim 2, If the displacement of the first support member and the second support member in the first direction in the first direction, caused by the vibration in the first direction, is defined as the first vibration displacement, and the displacement of the first support member and the second support member in the first direction in the second direction opposite to the first direction is defined as the second vibration displacement, The first vibration damping core unit is configured to be stretched in the first direction in response to the first vibration displacement, and to be compressed along the first direction in response to the second vibration displacement. The second vibration damping core unit is configured to be compressively deformed along the first direction in response to the first vibration displacement, and to be elongated along the first direction in response to the second vibration displacement. Vibration-damping structure.

4. A vibration damping structure according to claim 3, The vibration damping drive member is configured to be displaced in the second direction in response to the first vibration displacement, and to be displaced in the first direction in response to the second vibration displacement. Vibration-damping structure.

5. A vibration damping structure according to claim 1, Each of the one or more vibration damping units has a resonant frequency set with reference to the frequency of the vibration in the first direction that is to be damped. Vibration-damping structure.

6. A vibration damping structure according to claim 5, The frequency of the vibration in the first direction that is to be damped falls within the range of 20 Hz to 1000 Hz. Vibration-damping structure.

7. A vibration damping structure according to claim 1, Each of the one or more vibration damping units is connected between the first support member and the second support member, with reference to a first connection reference position set on the first support member and a second connection reference position set on the second support member, which is at the same position as the first connection reference position when viewed from the first direction. Vibration-damping structure.

8. A vibration damping structure according to claim 7, Each of the one or more vibration damping units is configured symmetrically with respect to a reference line extending in the first direction connecting the first connection reference position and the second connection reference position. Vibration-damping structure.

9. A vibration damping structure according to claim 1, In each of the one or more vibration damping units, The first rotating member, the second rotating member, the third rotating member, and the fourth rotating member are arranged symmetrically with respect to the center of the first vibration damping core unit. The fifth, sixth, seventh, and eighth rotating members are arranged symmetrically with respect to the center of the second vibration-damping core unit. Vibration-damping structure.

10. A vibration damping structure according to claim 1, When viewed from the first direction, the first hinge, the fifth hinge, the ninth hinge, and the eleventh hinge are positioned in the same location. When viewed from the first direction, the second hinge, the sixth hinge, the tenth hinge, and the twelfth hinge are positioned in the same location. When viewed from the first direction, the third hinge and the seventh hinge are positioned in the same location. When viewed from the first direction, the fourth hinge and the eighth hinge are positioned in the same location. Vibration-damping structure.

11. A vibration damping structure according to claim 1, Each of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth hinges is made of a thin-walled member that extends in the first direction and has a relatively small cross-sectional area perpendicular to the first direction. Vibration-damping structure.

12. A vibration damping structure according to claim 11, Each of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth hinges has a cross-sectional size perpendicular to the first direction, with reference to the frequency of the vibration in the first direction that is to be damped. Vibration-damping structure.

13. A vibration damping structure according to claim 11, At least one of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth hinges has a rounded chamfer at the connection point with other members. Vibration-damping structure.

14. A vibration damping structure according to claim 13, The radius of the R-chamfered portion is 1 mm or more. Vibration-damping structure.

15. A vibration damping structure according to claim 1, Each of the one or more vibration damping units is provided with one or more weights. Vibration-damping structure.

16. A vibration damping structure according to claim 15, The one or more weights mentioned above are The first vibration damping core unit comprises a first weight positioned on the first rotating member, a second weight positioned on the second rotating member, a third weight positioned on the third rotating member, and a fourth weight positioned on the fourth rotating member, The fifth weight positioned on the fifth rotating member of the second vibration damping core unit, the sixth weight positioned on the sixth rotating member, the seventh weight positioned on the seventh rotating member, and the eighth weight positioned on the eighth rotating member including Vibration-damping structure.

17. A vibration damping structure according to claim 16, The first weight, the second weight, the third weight, and the fourth weight are arranged symmetrically with respect to the center of the first vibration-damping core unit. The fifth weight, the sixth weight, the seventh weight, and the eighth weight are arranged symmetrically with respect to the center of the second vibration-damping core unit. Vibration-damping structure.

18. A vibration damping structure according to claim 15, The number, weight, shape, and placement of the one or more weights are determined based on the frequency of the vibration in the first direction that is to be damped. Vibration-damping structure.

19. A vibration damping structure according to claim 1, further, The first support member and the second support member are connected so as to surround the one or more vibration damping units, and the reinforcing member is provided to reinforce the rigidity of the vibration damping structure. Vibration-damping structure.

20. A vibration damping structure according to claim 19, A gap of at least 1 mm is provided between each of the one or more vibration damping units and the reinforcing member. Vibration-damping structure.

21. A vibration damping structure according to claim 19, Each of the one or more vibration damping units is connected between the first support member and the second support member, with reference to a first connection reference position set on the first support member and a second connection reference position set on the second support member which is at the same position as the first connection reference position when viewed from the first direction. The reinforcing member includes a pair of two oblique frame members connected to either the first support member or the second support member, and extending obliquely to the first direction so as to be symmetrical with respect to a reference line extending in the first direction that connects the first connection reference position and the second connection reference position. Vibration-damping structure.

22. A vibration damping structure according to claim 19, The reinforcing member is constructed with a truss structure. Vibration-damping structure.

23. A vibration damping structure according to claim 19, The reinforcing member is configured by topology optimization. Vibration-damping structure.

24. A vibration damping structure according to claim 19, The reinforcing member is composed of a plate-shaped member positioned in the area surrounding the one or more vibration damping units between the first support member and the second support member. Vibration-damping structure.

25. A vibration damping structure according to claim 22, The reinforcing member has a plurality of frame members, including a diagonal brace member extending diagonally with respect to the first direction, and an R-chamfered portion is formed at least one of the connection portion between the first support member and the plurality of frame members, the connection portion between the second support member and the plurality of frame members, and the connection portion between frame members included in the plurality of frame members. Vibration-damping structure.

26. A vibration damping structure according to claim 25, The reinforcing member has the R-shaped chamfered portion formed at the connection point between the bracing members. Vibration-damping structure.

27. A vibration damping structure according to claim 24, The reinforcing member has a rounded chamfer at at least one of the following: the connection portion between the first support member and the plate-shaped member, the connection portion between the second support member and the plate-shaped member, and the corner portion formed on the end face of the plate-shaped member. Vibration-damping structure.

28. A vibration damping structure according to claim 27, The reinforcing member has the R-chamfered portion formed at the corners of the opposing surfaces facing each of the one or more vibration damping units. Vibration-damping structure.

29. A vibration damping structure according to claim 25, The radius of the R-chamfered portion is 2 mm or more. Vibration-damping structure.

30. A vibration damping structure according to claim 1, The first vibration damping core unit includes at least one of a first internal reinforcing member connecting the first rotating member and the second rotating member to each other, and a second internal reinforcing member connecting the third rotating member and the fourth rotating member to each other. The second vibration-damping core unit has at least one of a third internal reinforcing member connecting the fifth rotating member and the sixth rotating member to each other, and a fourth internal reinforcing member connecting the seventh rotating member and the eighth rotating member to each other. Vibration-damping structure.

31. A vibration damping structure according to claim 1, A vibration input point is set at a predetermined position on the first support member. Vibration-damping structure.

32. A vibration damping structure according to claim 31, The vibration output point is set at a position on the first support member that is spaced apart from the vibration input point. Vibration-damping structure.

33. A vibration damping structure according to claim 1, The one or more vibration damping units are a plurality of vibration damping units arranged in a line along a second direction perpendicular to the first direction. Vibration-damping structure.

34. A vibration damping structure according to claim 33, A vibration input point is set at a predetermined position on the first support member. The vibration input point is set at the position of one end of the first support member in the second direction. Vibration-damping structure.

35. A vibration damping structure according to claim 33, A vibration input point is set at a predetermined position on the first support member. The vibration input point is set at the central position of the first support member in the second direction. Vibration-damping structure.

36. A vibration damping structure according to claim 1, The first direction is configured to be aligned with the vertical direction, and the first support member is positioned above the second support member. Vibration-damping structure.

37. A vibration damping structure according to claim 1, It is constructed as a metamaterial structure. Vibration-damping structure.

38. A device comprising one or more vibration damping structures, the device incorporating a vibration damping structure connected between a first member and a second member, Each of the one or more vibration damping structures is the vibration damping structure described in claim 1, wherein the first support member is connected to the first member such that a predetermined position of the first support member becomes a first vibration application point, and the first support member is connected to the second member such that a position spaced apart from the first vibration application point becomes a second vibration application point. A device incorporating a vibration-damping structure.

39. A device incorporating the vibration damping structure described in claim 38, further, A first connecting mechanism connects the first member to each of the one or more vibration damping structures so that when vibration is generated from the first member in the first direction, the vibration generated from the first member is input to the first point of vibration application, A second connecting mechanism connects the second member to each of the one or more vibration damping structures so that when vibration in the first direction is generated from the second member, the vibration generated from the second member is input to the second vibration application point. A device incorporating a vibration-damping structure equipped with the following features.

40. A device incorporating the vibration damping structure described in claim 38, Each of the one or more vibration damping structures is: The one or more vibration damping units include a plurality of vibration damping units arranged in a line along a second direction perpendicular to the first direction, The first support member is connected to the first member such that the position of one end of the first support member in the second direction becomes the first point of vibration, The second member is connected to the first support member such that the position of the other end of the first support member in the second direction becomes the second point of vibration. A device incorporating a vibration-damping structure.

41. A device incorporating the vibration damping structure described in claim 40, The one or more vibration damping structures are a plurality of vibration damping structures arranged so as to be aligned along a third direction perpendicular to each of the first and second directions, and such that when viewed from the third direction, the positions of the two ends in the second direction are aligned. The plurality of vibration damping structures are arranged alternately along the third direction, with a first vibration damping structure connected to the first member such that the end on the first side becomes the first point of vibration application when viewed from the third direction, and a second vibration damping structure connected to the second member such that the end on the second side opposite to the first side becomes the second point of vibration application, and a second vibration damping structure connected to the first member such that the end on the second side becomes the first point of vibration application, and a second vibration damping structure connected to the second member such that the end on the first side becomes the second point of vibration application. A device incorporating a vibration-damping structure.

42. A device incorporating the vibration damping structure described in claim 38, Each of the one or more vibration damping structures is: The one or more vibration damping units include a plurality of vibration damping units arranged in a line along a second direction perpendicular to the first direction, The first support member is connected to the first member such that the central position of the first support member in the second direction becomes the first point of vibration application. The first member is connected to the second support member such that the position of at least one end of the first member in the second direction becomes the second point of vibration. A device incorporating a vibration-damping structure.

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