Liquid-filled vibration isolation device and method for manufacturing the same

Abstract

The present invention provides a liquid-filled vibration isolation device and a method for manufacturing the same, which can efficiently contain liquids regardless of their viscosity and reduce the labor required for liquid containment. [Solution] The liquid-filled vibration isolation device 1 comprises a first member 2 having a first surface 10A and a second member 3 having a second surface 50A facing the first surface 10A. The first surface 10A of the first member 2 is provided with a accommodating recess 40 capable of accommodating liquid 41 and a fitting recess 25 formed on the surface side of the accommodating recess 40 and continuous with the accommodating recess 40. The second surface 50A of the second member 3 is provided with a fitting portion 55 that fits into the fitting recess 25.

Description

Technical Field

[0001] The present invention relates to a liquid-filled vibration isolator and a method for manufacturing the same.

Background Art

[0002] Conventionally, a liquid-filled vibration isolator having a space capable of accommodating a liquid is known. As a technique for accommodating a liquid in the space, Patent Document 1 discloses a technique of evacuating the space to a negative pressure in advance using a vacuum pump and then injecting the liquid into the space.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above conventional technology, since it is necessary to evacuate the space to a negative pressure in advance, there is a possibility that the man-hours required for liquid accommodation increase. Further, when accommodating a liquid having a high viscosity (i.e., a liquid having poor fluidity) in the space, there is a possibility that the liquid cannot be efficiently accommodated in the space.

[0005] In view of the above background, an aspect of the present invention is to provide a liquid-filled vibration isolator and a method for manufacturing the same that can efficiently accommodate a liquid regardless of the viscosity of the liquid and can reduce the man-hours required for liquid accommodation.

Means for Solving the Problems

[0006] To solve the above problems, one aspect of the present invention is a liquid-filled vibration isolation device comprising a first member having a first surface and a second member having a second surface facing the first surface, wherein the first surface of the first member is provided with a accommodating recess capable of accommodating liquid and a fitting recess formed on the surface side of the accommodating recess and continuous with the accommodating recess, and the second surface of the second member is provided with a fitting portion that fits into the fitting recess.

[0007] To solve the above problems, another aspect of the present invention is a method for manufacturing the above-described liquid-filled vibration damping device, comprising a filling step of filling the receiving recess and the fitting recess with the liquid, and a fitting step of fitting the fitting part into the fitting recess, wherein vacuum degassing of the liquid is started after the completion of the filling step and during the execution of the fitting step.

[0008] To solve the above problems, another aspect of the present invention is a method for manufacturing the above-described liquid-filled vibration damping device, comprising: a filling step of filling the housing recess and the fitting recess with the liquid; and a fitting step of fitting the fitting part into the fitting recess, thereby causing the liquid filled in the fitting recess to overflow and degassing the liquid under vacuum. [Effects of the Invention]

[0009] According to the above embodiments, it is possible to provide a liquid-filled vibration isolation device and a method for manufacturing the same that can efficiently contain liquids regardless of the viscosity of the liquid and reduce the man-hours required for liquid containment. [Brief explanation of the drawing]

[0010] [Figure 1] Cross-sectional view showing a liquid-filled vibration isolation device according to one embodiment of the present invention. [Figure 2] Perspective view showing the first component according to one embodiment of the present invention [Figure 3] Partially cut-out perspective cross-sectional view showing the first member according to one embodiment of the present invention. [Figure 4] Perspective view showing a second member according to one embodiment of the present invention. [Figure 5]In a method for manufacturing a liquid-filled vibration isolation device according to one embodiment of the present invention, (A) an explanatory diagram showing the filling process and (B) an explanatory diagram showing the vacuuming process. [Figure 6] In a method for manufacturing a liquid-filled vibration isolation device according to one embodiment of the present invention, (A) an explanatory diagram showing the start of the fitting process and (B) an explanatory diagram showing the completion of the fitting process. [Figure 7] Underside view of a vehicle to which a liquid-filled vibration damping device according to one embodiment of the present invention is applied. [Figure 8] Side cross-sectional view showing a mounting member and its surroundings in a vehicle to which a liquid-filled vibration damping device according to one embodiment of the present invention is applied. [Figure 9] Cross-sectional view showing a liquid-sealed vibration damping device according to another embodiment of the present invention. [Modes for carrying out the invention]

[0011] The following describes embodiments of a liquid-filled vibration isolation device and its manufacturing method, with reference to the drawings.

[0012] <Liquid-filled vibration isolation device 1> First, let's describe the liquid-filled vibration isolation device 1 (hereinafter abbreviated as "vibration isolation device 1"). For the sake of convenience, the following explanation will use terms indicating directions such as upward and downward, based on the orientation of vibration isolation device 1 in Figure 1 (i.e., the orientation at the time of completion of manufacturing). However, the orientation of vibration isolation device 1 during actual use is not limited to the orientation of vibration isolation device 1 in Figure 1, and can be freely changed according to the layout of vibration isolation device 1, etc.

[0013] Referring to Figure 1, the vibration isolation device 1 is an annular shape with a central axis C. Hereinafter, the side approaching the central axis C will be referred to as the inner circumference side, and the side moving away from the central axis C will be referred to as the outer circumference side. Hereinafter, when simply referred to as "radial direction," it refers to the radial direction with respect to the central axis C, and when simply referred to as "circumferential direction," it refers to the circumferential direction with respect to the central axis C. The vibration isolation device 1 comprises a first member 2 and a second member 3 attached to the first member 2.

[0014] <First component 2> Referring to FIGS. 1 to 3, the first member 2 includes a first annular portion 10 having an annular shape centered on the central axis C, a first cylindrical portion 11 protruding downward from an end portion on the inner peripheral side of the first annular portion 10 and having a cylindrical shape centered on the central axis C, and an inner peripheral wall portion 12 protruding from the lower end portion of the first cylindrical portion 11 toward the inner peripheral side and having an annular shape centered on the central axis C.

[0015] The first annular portion 10 of the first member 2 includes a base member 15, a membrane 16 (an example of an elastic member) attached to the base member 15, and a ring member 17. The base member 15, the membrane 16, and the ring member 17 are provided separately from each other.

[0016] The base member 15 of the first annular portion 10 has an annular shape centered on the central axis C. A plurality of openings 20 are provided in the base member 15 at intervals in the circumferential direction. Each opening 20 penetrates from the upper surface 21 to the lower surface 22 of the base member 15. The base member 15 is formed of, for example, a metal such as iron.

[0017] The membrane 16 of the first annular portion 10 has an annular shape centered on the central axis C. The membrane 16 covers a part of the upper surface 21 of the base member 15, a part of the lower surface 22 of the base member 15, and the plurality of openings 20 of the base member 15. The membrane 16 is formed of, for example, an elastic material such as rubber. The rigidity of the membrane 16 is lower than that of the base member 15.

[0018] The ring member 17 of the first annular portion 10 has an annular shape centered on the central axis C. The ring member 17 is attached to an end portion on the outer peripheral side of the upper surface 21 of the base member 15. The ring member 具有 an annular shape centered on the central axis C. The ring member 17 is disposed on the outer peripheral side of the membrane 16.

[0019] A fitting recess 25 is provided on the upper surface 10A of the first annular portion 10 (an example of the first surface of the first member). The fitting recess 25 is an annular shape centered on the central axis C. The fitting recess 25 is formed continuously with the receiving recess 40 on the upper side (an example of the surface side) of the receiving recess 40, which will be described later. The fitting recess 25 is formed by a membrane 16. Annular protrusions 29 are provided on the outer circumferential portion 27 and inner circumferential portion 28 of the bottom surface 25A of the fitting recess 25, respectively, facing upward. Annular projections 30 and 31 are provided on the outer circumferential surface 25B and inner circumferential surface 25C of the fitting recess 25, respectively, facing laterally.

[0020] An outer peripheral projection 35 is provided on the outer peripheral side of the fitting recess 25 on the upper surface 10A of the first annular portion 10. The outer peripheral projection 35 is provided continuously with the fitting recess 25. The inner peripheral surface of the outer peripheral projection 35 defines the outer peripheral surface 25B of the fitting recess 25. The outer peripheral projection 35 protrudes perpendicularly to the upper surface 10A of the first annular portion 10. The outer peripheral projection 35 forms an annular shape with a central axis C. The outer peripheral projection 35 is formed by the base member 15 and the membrane 16.

[0021] An inner circumferential projection 36 is provided on the upper surface 10A of the first annular portion 10, on the inner circumferential side of the fitting recess 25. The inner circumferential projection 36 is provided continuously with the fitting recess 25. The outer circumferential surface of the inner circumferential projection 36 defines the inner circumferential surface 25C of the fitting recess 25. The inner circumferential projection 36 protrudes perpendicularly to the upper surface 10A of the first annular portion 10. The inner circumferential projection 36 forms an annular shape with a central axis C. The inner circumferential projection 36 is formed by the base member 15 and the membrane 16.

[0022] A receiving recess 40 is provided on the upper surface 10A of the first annular portion 10. The receiving recess 40 is an annular shape centered on the central axis C. The receiving recess 40 is recessed downward from the radial center of the bottom surface 25A of the fitting recess 25. The receiving recess 40 is provided to accommodate a magnetic fluid 41 (an example of a liquid). In other embodiments, the receiving recess 40 may be provided to accommodate a non-magnetic fluid. The outer circumferential surface 40A and the inner circumferential surface 40B of the receiving recess 40 are formed by a membrane 16. The bottom surface 40C of the receiving recess 40 has a plurality of rigid parts 42 formed by the base member 15 and a plurality of elastic parts 43 formed by the membrane 16. The plurality of rigid parts 42 and the plurality of elastic parts 43 are arranged alternately in the circumferential direction. A portion of each elastic part 43 is housed in each opening 20 of the base member 15. A groove 44 is provided in a portion of each elastic part 43 (i.e., the portion that is housed in each opening 20 of the base member 15) that extends downward. The bottom surface 44A of the groove 44 has an uneven shape.

[0023] The first cylindrical portion 11 and the inner circumferential wall portion 12 of the first member 2 are provided integrally with the base member 15 of the first annular portion 10. The first cylindrical portion 11 and the inner circumferential wall portion 12 are provided separately from the membrane 16 and ring member 17 of the first annular portion 10.

[0024] <Second component 3> Referring to Figures 1 and 4, the second member 3 comprises a second annular portion 50 that forms an annular shape with a central axis C, a second cylindrical portion 51 that protrudes downward from the inner circumference end of the second annular portion 50 and forms a cylindrical shape with a central axis C, a connector 52 attached to the second annular portion 50 and the second cylindrical portion 51, and a coil 53 held by the connector 52.

[0025] The lower surface 50A of the second annular portion 50 of the second member 3 (an example of the second surface of the second member) faces the upper surface 10A of the first annular portion 10. The second annular portion 50 is not in contact with the base member 15 of the first annular portion 10, but is in contact with the membrane 16 and ring member 17 of the first annular portion 10.

[0026] A fitting portion 55 is provided on the lower surface 50A of the second annular portion 50. The fitting portion 55 is an annular shape centered on the central axis C. The lower surface 55A of the fitting portion 55 abuts against the bottom surface 25A of the fitting recess 25 of the first member 2 so as to cover the upper surface (an example of a surface) of the receiving recess 40 of the first member 2. The lower surface 55A of the fitting portion 55 abuts against a raised portion 29 provided on the bottom surface 25A of the fitting recess 25, thereby elastically deforming the raised portion 29. The outer circumferential surface 55B of the fitting portion 55 fits onto the outer circumferential surface 25B of the fitting recess 25. The outer circumferential surface 55B of the fitting portion 55 abuts against a projection 30 provided on the outer circumferential surface 25B of the fitting recess 25, thereby elastically deforming the projection 30. The inner circumferential surface 55C of the fitting portion 55 is fitted into the inner circumferential surface 25C of the fitting recess 25. The inner circumferential surface 55C of the fitting portion 55 abuts against the projection 31 provided on the inner circumferential surface 25C of the fitting recess 25, thereby causing the projection 31 to elastically deform.

[0027] An outer peripheral recess 56 is provided on the lower surface 50A of the second annular portion 50 on the outer peripheral side of the fitting portion 55. The outer peripheral recess 56 is provided continuously with the fitting portion 55. The outer peripheral recess 56 forms an annular shape with the central axis C as the center. The outer peripheral projection 35 of the first member 2 is fitted into the outer peripheral recess 56.

[0028] An inner circumferential recess 57 is provided on the lower surface 50A of the second annular portion 50, on the inner circumferential side of the fitting portion 55. The inner circumferential recess 57 is provided continuously with the fitting portion 55. The inner circumferential recess 57 forms an annular shape with the central axis C as the center. The inner circumferential projection 36 of the first member 2 is fitted into the inner circumferential recess 57.

[0029] A through hole 60 is provided in the radial center of the second annular portion 50. The through hole 60 penetrates from the lower surface 50A to the upper surface 50B (an example of the surface opposite to the second surface of the second member) of the second annular portion 50. The lower end of the through hole 60 (the end on the second surface side) opens into the receiving recess 40 of the first member 2. The through hole 60 is closed by a plug member 61. The plug member 61 is made of, for example, a screw or a ball. A connecting hole 62 is provided at the inner circumference end of the second annular portion 50. The connecting hole 62 penetrates from the lower surface 50A to the upper surface 50B of the second annular portion 50.

[0030] The second cylindrical portion 51 of the second member 3 is provided integrally with the second annular portion 50. The outer circumferential surface of the second cylindrical portion 51 is fitted into the inner circumferential wall portion 12 of the first member 2. The inner circumferential surface of the second cylindrical portion 51 defines a central hole 4.

[0031] The connector 52 of the second member 3 has a main body portion 65 provided along the upper surface 50B of the second annular portion 50, a coil holding portion 66 provided on the outer circumference of the second cylindrical portion 51, and a connecting portion 67 that penetrates the connection hole 62 of the second annular portion 50 and connects the main body portion 65 and the coil holding portion 66. The main body portion 65 is provided with a fitting groove 68 into which a power supply terminal (not shown) can be fitted. The fitting groove 68 is provided with a power receiving terminal 69 that can be connected to the power supply terminal.

[0032] The coil 53 of the second member 3 is cylindrical in shape with a central axis C. The coil 53 is provided coaxially with the first cylindrical portion 11 of the first member 2 and the second cylindrical portion 51 of the second member 3. The coil 53 is positioned on the inner circumference side of the first cylindrical portion 11 and on the outer circumference side of the second cylindrical portion 51. The coil 53 is held in the coil holding portion 66 of the connector 52. The coil 53 and the housing recess 40 of the first member 2 are aligned radially.

[0033] The coil 53 is connected to the power receiving terminal 69 of the connector 52 via the wiring 70. When current is supplied to the coil 53 from the power receiving terminal 69 via the wiring 70, the coil 53 generates a magnetic field. This applies a magnetic field to the magnetic fluid 41 in the housing recess 40, and the metal powder in the magnetic fluid 41 is aligned in the direction of the magnetic field. This increases the viscous resistance of the magnetic fluid 41 in the direction perpendicular to the direction of the magnetic field, thereby increasing the rigidity of the vibration isolation device 1.

[0034] <Manufacturing method for vibration isolation device 1> Next, we will explain how to manufacture the vibration isolation device 1 configured as described above.

[0035] Referring to Figure 5(A), the operator first performs the filling process. In the filling process, the operator fills the housing recess 40 and the fitting recess 25 of the first member 2 with magnetic fluid 41 using the filling device 71. By filling the housing recess 40 and the fitting recess 25 with magnetic fluid 41 in this way, the first member 2 can be filled with a volume of magnetic fluid 41 that is larger than the volume of the housing recess 40.

[0036] Referring to Figure 5(B), the operator performs a vacuuming process after the completion of the filling process. In the vacuuming process, the operator places the first member 2 in a sealed space S and performs a vacuum on the sealed space S. This increases the buoyancy of the bubbles in the magnetic fluid 41, causing the bubbles in the magnetic fluid 41 to be released from the upper surface of the magnetic fluid 41. In other words, the magnetic fluid 41 is degassed.

[0037] Referring to Figures 6(A) and 6(B), the operator performs the fitting process after the vacuuming process is completed. In the fitting process, the operator connects the discharge pipe 72 to the through hole 60 of the second member 3. Furthermore, the operator positions the second member 3 above the first member 2 and pushes the second member 3 downward toward the first member 2, thereby fitting the fitting portion 55 of the second member 3 into the fitting recess 25 of the first member 2 from above. When the fitting portion 55 is fitted into the fitting recess 25 in this way, the magnetic fluid 41 filled in the fitting recess 25 overflows and is discharged into the discharge pipe 72 through the through hole 60. Consequently, air bubbles in the magnetic fluid 41 are released from the upper surface of the magnetic fluid 41 inside the discharge pipe 72. In other words, the magnetic fluid 41 is degassed.

[0038] In this embodiment, between the start of the fitting process (see Figure 6(A)) and the completion of the fitting process (see Figure 6(B)), the operator starts vacuum suction of the magnetic fluid 41 using a suction device (not shown) connected to the discharge pipe 72. In other words, in this embodiment, after the completion of the filling process and during the execution of the fitting process, the operator starts vacuum degassing of the magnetic fluid 41. As a result, the space defined by the receiving recess 40, the fitting recess 25, and the fitting portion 55 (i.e., the space that contains the magnetic fluid 41) becomes negative pressure, generating a force that pulls the fitting portion 55 downwards (towards the receiving recess 40). Therefore, the fitting recess 25 and the fitting portion 55 can be fitted with less force.

[0039] Referring to Figure 1, once the fitting process is complete, the worker removes the discharge pipe 72 from the through hole 60 and closes the through hole 60 with the plug member 61. This completes the manufacturing of the vibration isolation device 1. In other embodiments, some or all of the above-described manufacturing method of the vibration isolation device 1 may be automatically performed by a manufacturing apparatus equipped with a computer.

[0040] <Effects> The volume of the liquid chamber between the first member 2 and the second member 3 at the start of the fitting process (i.e., the total volume of the receiving recess 40 and the fitting recess 25: see Figure 6(A)) is greater than the volume of the liquid chamber between the first member 2 and the second member 3 at the completion of the fitting process (i.e., the volume of the receiving recess 40: see Figure 6(B)). Therefore, when the fitting process is performed, a portion of the magnetic fluid 41 contained in the liquid chamber between the first member 2 and the second member 3 overflows. This allows for efficient degassing of the magnetic fluid 41.

[0041] Incidentally, one possible method for filling the receiving recess 40 and the fitting recess 25 with magnetic fluid 41 is to attach the second member 3 to the first member 2 within the magnetic fluid 41. However, if such a method is adopted, the magnetic fluid 41 will adhere to the entire vibration isolation device 1, making the cleaning of the vibration isolation device 1 complicated if the viscosity of the magnetic fluid 41 is high. In contrast, in this embodiment, the magnetic fluid 41 is locally filled only into the receiving recess 40 and the fitting recess 25 (see Figure 5(A)), so the magnetic fluid 41 does not adhere to the entire vibration isolation device 1. Therefore, even if the viscosity of the magnetic fluid 41 is high, the cleaning of the vibration isolation device 1 becomes easier.

[0042] <Examples of application of vibration isolation device 1> Next, referring to Figures 7 and 8, we will describe a vehicle 80 to which the vibration isolation device 1 is applied as an example of its application. The arrow Fr in Figure 7 indicates the front of the vehicle 80.

[0043] Referring to Figure 7, the vehicle 80 comprises a body 81 extending in the longitudinal direction, a subframe 82 positioned along the lower rear surface 81A of the body 81, left and right rear wheels 83 positioned on both sides of the subframe 82, left and right arm members 84 connecting the subframe 82 and the left and right rear wheels 83, left and right suspensions 85 positioned between the left and right arm members 84 and the body 81, and four mounting members 86 attached to the four corners of the subframe 82, front and rear, left and right.

[0044] Referring to Figure 8, the subframe 82 is positioned at a distance from the lower rear surface 81A of the vehicle body 81. Mounting holes 88 are provided in the subframe 82 along the vertical direction. The mounting holes 88 are cylindrical in shape with a central axis C.

[0045] Referring to Figure 8, the mounting member 86 is positioned between the vehicle body 81 and the subframe 82. The mounting member 86 comprises an inner cylinder 90, an outer cylinder 91 positioned on the outer circumference of the inner cylinder 90, an elastic body 92 positioned between the inner cylinder 90 and the outer cylinder 91, the aforementioned vibration damping device 1 attached to the lower ends of the inner cylinder 90 and the elastic body 92, and a cover 93 positioned on the outer circumference of the vibration damping device 1. Note that in Figure 8, the vibration damping device 1 is positioned in an inverted orientation compared to the orientation in Figure 1 (i.e., the orientation at the time of manufacture).

[0046] The inner cylinder 90 is cylindrical with a central axis C at its center. The inner circumferential surface of the inner cylinder 90 defines an axle hole 94. The axle hole 94 is located above the central hole 4 of the second cylindrical portion 51 of the second member 3, and is coaxial with the central hole 4. The inner cylinder 90 and the second cylindrical portion 51 are fastened to the vehicle body 81 by bolts 95 and nuts 96 that pass through the axle hole 94 and the central hole 4.

[0047] The outer cylinder 91 is cylindrical in shape with a central axis C. The outer surface of the outer cylinder 91 is fitted into the inner surface of the mounting hole 88 of the subframe 82. In this way, the outer cylinder 91 is attached to the subframe 82.

[0048] The elastic body 92 is cylindrical with a central axis C. The elastic body 92 is made of an elastic material such as rubber. A main fluid chamber 97 is defined inside the elastic body 92. The main fluid chamber 97 is cylindrical with a central axis C. The main fluid chamber 97 is partitioned from the housing recess 40 of the vibration isolation device 1 by the membrane 16. The main fluid chamber 97 is provided to accommodate mounting fluid 98. The main fluid chamber 97 communicates with inlets (not shown) provided in the second member 3 and the membrane 16, respectively, and the mounting fluid 98 can be injected into the main fluid chamber 97 through these inlets.

[0049] <Other variations> Referring to Figure 1, in the above embodiment, the radial length of the receiving recess 40 is shorter than the radial length of the fitting recess 25, and a step is created between the receiving recess 40 and the fitting recess 25. Referring to Figure 9, in another embodiment, the radial length of the receiving recess 40 is the same as the radial length of the fitting recess 25, and a step is not required between the receiving recess 40 and the fitting recess 25.

[0050] In the above embodiment, the second member 3 is equipped with a coil 53. In other embodiments, the first member 2 may be equipped with a coil 53.

[0051] In the above embodiment, projections 30 and 31 are provided on both the outer circumferential surface 25B and the inner circumferential surface 25C of the fitting recess 25. In other embodiments, projections may be provided on only one of the outer circumferential surface 25B and the inner circumferential surface 25C of the fitting recess 25.

[0052] In the above embodiment, the mounting member 86 equipped with the vibration damping device 1 is positioned between the vehicle body 81 and the subframe 82. In other embodiments, the mounting member 86 equipped with the vibration damping device 1 may be positioned at a location other than those mentioned above on the vehicle 80 (for example, the left and right suspensions 85, engine mount, or motor mount), or on a structure other than the vehicle 80.

[0053] <Summary of Embodiments> The liquid-filled vibration isolation device 1 comprises a first member 2 having a first surface 10A and a second member 3 having a second surface 50A facing the first surface 10A. The first surface 10A of the first member 2 is provided with a accommodating recess 40 capable of accommodating liquid 41 and a fitting recess 25 formed on the surface side of the accommodating recess 40 and continuous with the accommodating recess 40. The second surface 50A of the second member 3 is provided with a fitting portion 55 that fits into the fitting recess 25.

[0054] According to this embodiment, after filling the receiving recess 40 with liquid 41, the fitting portion 55 is fitted into the fitting recess 25, thereby efficiently containing the liquid 41 within the receiving recess 40 regardless of its viscosity. Furthermore, since the liquid 41 can be contained within the receiving recess 40 without pre-depressurizing the inside of the receiving recess 40 using a vacuum pump, the amount of work required to contain the liquid 41 can be reduced.

[0055] The fitting recess 25 and the fitting portion 55 are annular in shape, and at least one of the outer circumferential surface 25B and inner circumferential surface 25C of the fitting recess 25 is provided with projections 30 and 31, and the fitting portion 55 may abut against the projections 30 and 31.

[0056] According to this embodiment, when the fitting recess 25 and the fitting portion 55 are fitted together, it is possible to prevent the liquid 41 from leaking from between the fitting recess 25 and the fitting portion 55.

[0057] The fitting recess 25 and the fitting portion 55 are annular in shape, and the first surface 10A of the first member 2 is provided with an outer peripheral projection 35 on the outer circumference of the fitting recess 25, and the second surface 50A of the second member 3 is provided with an outer peripheral recess 56 on the outer circumference of the fitting portion 55, and the outer peripheral projection 35 may be fitted into the outer peripheral recess 56.

[0058] According to this embodiment, in addition to the fitting recess 25 and the fitting portion 55 fitting together, the fitting of the outer peripheral projection 35 and the outer peripheral recess 56 allows the first member 2 and the second member 3 to be fixed more firmly. Furthermore, by providing an additional fitting structure between the outer peripheral projection 35 and the outer peripheral recess 56 near the receiving recess 40, it is possible to prevent the liquid 41 from leaking from between the fitting recess 25 and the fitting portion 55 when the fitting recess 25 and the fitting portion 55 are fitted together.

[0059] The fitting recess 25 and the fitting portion 55 are annular in shape, and the first surface 10A of the first member 2 is provided with an inner circumferential projection 36 on the inner circumference of the fitting recess 25, and the second surface 50A of the second member 3 is provided with an inner circumferential recess 57 on the inner circumference of the fitting portion 55, and the inner circumferential projection 36 may be fitted into the inner circumferential recess 57.

[0060] According to this embodiment, in addition to the fitting recess 25 and the fitting portion 55 fitting together, the inner circumferential projection 36 and the inner circumferential recess 57 fitting together allows the first member 2 and the second member 3 to be fixed more firmly. Furthermore, by providing an additional fitting structure between the inner circumferential projection 36 and the inner circumferential recess 57 near the receiving recess 40, it is possible to prevent the liquid 41 from leaking from between the fitting recess 25 and the fitting portion 55 when the fitting recess 25 and the fitting portion 55 are fitted together.

[0061] The first member 2 comprises a first annular portion 10 forming an annular shape with respect to a central axis C, and a first cylindrical portion 11 protruding from the first annular portion 10 and forming a cylindrical shape with respect to the central axis C, with the receiving recess 40 and the fitting recess 25 provided in the first annular portion 10. The second member 3 comprises a second annular portion 50 forming an annular shape with respect to a central axis C, and a second cylindrical portion 51 protruding from the second annular portion 50 and forming a cylindrical shape with respect to the central axis C, with the fitting portion 55 potentially provided in the second annular portion 50.

[0062] According to this embodiment, the receiving recess 40 can be formed in an annular shape with respect to the central axis C. Therefore, the liquid 41 contained in the receiving recess 40 can efficiently dampen vibrations over the entire circumferential region.

[0063] The receiving recess 40 is provided to accommodate the magnetic fluid as the liquid 41, and either the first member 2 or the second member 3 is provided with a coil 53 that is cylindrical with respect to the central axis C, and the coil 53 and the receiving recess 40 may be aligned radially with respect to the central axis C.

[0064] In this embodiment, the coil 53 and the magnetic fluid 41 can be arranged side by side in the radial direction centered on the central axis C. With this arrangement, when an electric current is passed through the coil 53, the magnetic field formed around the coil 53 is applied to the magnetic fluid 41, changing the viscosity and rigidity of the magnetic fluid 41. As a result, the damping force of the vibration isolation device 1 can be controlled by the electric current flowing through the coil 53, thereby efficiently damping vibrations.

[0065] The second member 3 further comprises a connector 52 having a power receiving terminal 69, the connector 52 comprises a coil holding portion 66 provided on the outer circumference of the second cylindrical portion 51, and the coil 53 may be held in the coil holding portion 66.

[0066] According to this embodiment, the coil 53 can be mounted on the vibration isolation device 1 by fixing the first member 2 and the second member 3. Therefore, the number of steps required can be reduced compared to the case where the step of mounting the coil 53 on the vibration isolation device 1 is performed separately from the step of fixing the first member 2 and the second member 3.

[0067] The first member 2 further comprises an inner circumferential wall portion 12 that protrudes inward from the first cylindrical portion 11, and the outer circumferential surface of the second cylindrical portion 51 may be fitted into the inner circumferential wall portion 12.

[0068] According to this embodiment, in addition to the fitting recess 25 and the fitting portion 55 fitting together, the inner circumferential wall portion 12 and the outer circumferential surface of the second cylindrical portion 51 also fitting together, thereby enabling the first member 2 and the second member 3 to be fixed more firmly.

[0069] The first annular portion 10 comprises a base member 15 formed integrally with the first cylindrical portion 11 and an elastic member 16 attached to the base member 15, and the fitting recess 25 may be formed by the elastic member 16.

[0070] According to this embodiment, when the fitting recess 25 and the fitting portion 55 are fitted together, the fitting recess 25 and the fitting portion 55 can be made to fit together more tightly. Therefore, when the fitting recess 25 and the fitting portion 55 are fitted together, it is possible to prevent the liquid 41 from leaking from between the fitting recess 25 and the fitting portion 55.

[0071] The receiving recess 40 is recessed from a part of the bottom surface 25A of the fitting recess 25, and the fitting portion 55 may abut against the bottom surface 25A of the fitting recess 25 so as to cover the surface of the receiving recess 40.

[0072] According to this embodiment, by bringing the fitting portion 55 into contact with the bottom surface 25A of the fitting recess 25, it is possible to prevent the liquid 41 from leaking from between the fitting recess 25 and the fitting portion 55.

[0073] The second member 3 has a through hole 60 that penetrates from the second surface 50A to the surface 50B opposite to the second surface 50A, and the end of the through hole 60 on the second surface 50A side may open into the receiving recess 40.

[0074] According to this embodiment, when the fitting recess 25 and the fitting portion 55 are fitted together, the liquid 41 can be degassed by allowing it to overflow from the through hole 60.

[0075] Another embodiment is a method for manufacturing a liquid-filled vibration-damping device 1, comprising a filling step of filling the receiving recess 40 and the fitting recess 25 with the liquid 41, and a fitting step of fitting the fitting portion 55 into the fitting recess 25, wherein vacuum degassing of the liquid 41 is started after the completion of the filling step and during the execution of the fitting step.

[0076] According to this embodiment, vacuum degassing of the liquid 41 creates a negative pressure in the space formed by the receiving recess 40, the fitting recess 25, and the fitting portion 55 (i.e., the space that contains the liquid 41), generating a force that pulls the fitting portion 55 toward the receiving recess 40. Therefore, the fitting recess 25 and the fitting portion 55 can be fitted together with less force.

[0077] Another embodiment is a method for manufacturing a liquid-filled vibration damping device 1, comprising a filling step of filling the receiving recess 40 and the fitting recess 25 with the liquid 41, and a fitting step of fitting the fitting portion 55 into the fitting recess 25 to cause the liquid 41 filled in the fitting recess 25 to overflow and degas the liquid 41.

[0078] According to this embodiment, the liquid 41 can be degassed at the same time as the liquid 41 overflows.

[0079] After the completion of the filling process and before the start of the fitting process, the liquid 41 may be degassed by evacuating the sealed space S in which the first member 2 is placed.

[0080] According to this embodiment, by degassing the liquid 41 in advance prior to degassing the liquid 41 in the fitting process, the liquid 41 can be degassed more reliably. In addition, the degassing time in the fitting process can be shortened.

[0081] This concludes the description of specific embodiments, but the present invention is not limited to the above embodiments or modifications and can be broadly modified and implemented. [Explanation of Symbols]

[0082] 1: Liquid-filled vibration isolation device 2: First member 3: Second member 10: First Ring Section 10A: Top surface (an example of the first surface of the first member) 11: First cylindrical part 12: Inner peripheral wall 15: Base component 16: Membrane (an example of an elastic member) 25: Fitting recess 25A: Bottom 25B: Outer surface 25C: Inner surface 30:Protrusion 31:Protrusion 35: Outer protrusion 36: Inner circumferential projection 40: Recessed recess 41: Magnetic fluid (an example of a liquid) 50: Second Ring Section 50A: Bottom surface (an example of the second surface of the second member) 50B: Top surface (an example of the surface opposite to the second surface of the second member) 51: Second cylindrical part 52: Connector 53: Coil 55: Mating part 56: Outer periphery recess 57: Inner circumferential recess 60: Through hole 66: Coil holding part 69: Power receiving terminal C: Central axis

Claims

1. A liquid-filled vibration isolation device, A first member having a first surface, A second member having a second surface facing the first surface, The first surface of the first member is provided with a liquid-containing recess and a fitting recess formed continuously with the liquid-containing recess on the surface side of the liquid-containing recess. A liquid-filled vibration isolation device is provided on the second surface of the second member, which has a fitting portion that fits into the fitting recess.

2. The aforementioned fitting recess and fitting portion are annular in shape. A projection is provided on at least one of the inner and outer circumferential surfaces of the fitting recess. The liquid-filled vibration isolation device according to claim 1, wherein the fitting portion is in contact with the projection portion.

3. The aforementioned fitting recess and fitting portion are annular in shape. The first surface of the first member is provided with an outer peripheral projection on the outer circumference of the fitting recess, The second surface of the second member is provided with an outer peripheral recess on the outer circumference of the fitting portion, The liquid-filled vibration isolation device according to claim 1, wherein the outer peripheral projection is fitted into the outer peripheral recess.

4. The aforementioned fitting recess and fitting portion are annular in shape. On the first surface of the first member, an inner circumferential projection is provided on the inner circumference of the fitting recess. The second surface of the second member is provided with an inner circumferential recess on the inner circumference of the fitting portion. The liquid-filled vibration isolation device according to claim 1, wherein the inner circumferential projection is fitted into the inner circumferential recess.

5. The first member is, A first annular section forming a ring around the central axis, It comprises a first cylindrical portion that protrudes from the first annular portion and forms a cylindrical shape with respect to the central axis, The receiving recess and the fitting recess are provided in the first annular portion, The second member is, A second annular portion forming an annular shape with respect to the aforementioned central axis, It comprises a second cylindrical portion that protrudes from the second annular portion and forms a cylindrical shape with respect to the central axis, The fitting portion is provided on the second annular portion, as described in any one of claims 1 to 4.

6. The aforementioned receiving recess is provided so as to be able to accommodate the magnetic fluid as the liquid, Either the first member or the second member is provided with a coil that is cylindrical in shape with respect to the central axis, The liquid-filled vibration isolation device according to claim 5, wherein the coil and the housing recess are arranged radially with respect to the central axis.

7. The second member further comprises a connector having a power receiving terminal, The connector includes a coil holding portion provided on the outer circumference of the second cylindrical portion, The liquid-filled vibration isolation device according to claim 6, wherein the coil is held in the coil holding portion.

8. The first member further comprises an inner circumferential wall portion that protrudes toward the inner circumference from the first cylindrical portion, The liquid-filled vibration isolation device according to claim 5, wherein the outer circumferential surface of the second cylindrical portion is fitted to the inner circumferential wall portion.

9. The first annular portion is, A base member formed integrally with the first cylindrical portion, The system comprises an elastic member attached to the base member, The liquid-filled vibration isolation device according to claim 5, wherein the fitting recess is formed by the elastic member.

10. The receiving recess is recessed from a part of the bottom surface of the fitting recess, The liquid-filled vibration isolation device according to any one of claims 1 to 4, wherein the fitting portion abuts against the bottom surface of the fitting recess so as to cover the surface of the receiving recess.

11. The second member has a through hole that penetrates from the second surface to the surface opposite to the second surface, The liquid-filled vibration isolation device according to any one of claims 1 to 4, wherein the end of the through hole on the second surface side opens into the receiving recess.

12. A method for manufacturing a liquid-filled vibration isolation device according to claim 1, A filling step of filling the aforementioned receiving recess and the aforementioned fitting recess with the liquid, The fitting step includes fitting the fitting portion into the fitting recess, A method for manufacturing a liquid-filled vibration-damping device, wherein vacuum degassing of the liquid is initiated after the completion of the filling step and during the execution of the fitting step.

13. A method for manufacturing a liquid-filled vibration isolation device according to claim 1, A filling step of filling the aforementioned receiving recess and the aforementioned fitting recess with the liquid, A method for manufacturing a liquid-filled vibration-damping device, comprising a fitting step of fitting the fitting portion into the fitting recess, thereby causing the liquid filled in the fitting recess to overflow and degas the liquid.

14. A method for manufacturing a liquid-filled vibration damping device according to claim 12 or 13, wherein the liquid is degassed by performing a vacuum on the sealed space in which the first member is placed after the completion of the filling step and before the start of the fitting step.

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