Vibration isolation device

Abstract

The present invention aims to provide a vibration isolation device capable of avoiding contact of an elastic shaft portion with a mounting member and ensuring a large cross-sectional area of the elastic shaft portion. The vibration isolation device includes a bracket (2) having a fixed portion (21) and a spanning portion (22) forming an opening (A) together with the fixed portion (21); a mounting member (3) mounted to the opening (A) formed in the bracket (2); and an elastic shaft portion (41) mounted to the mounting member (3) and extending along an axial direction inside the opening (A). The mounting member (3) has a peripheral wall portion (31) surrounding the elastic shaft portion (41) in a peripheral direction. The peripheral wall portion (31) has a recess (32) extending in the axial direction at at least one point in the peripheral direction.

Description

Technical Field

[0001] This invention relates to a vibration isolation device. Background Technology

[0002] Conventional vibration isolation devices contain a structure in which a mounting member is pressed into an opening formed in a bracket by means of an elastic body, and the mounting member is connected to the bracket by an elastic shaft (see, for example, Patent Document 1). This ensures spring characteristics with respect to the pressing direction of the mounting member (the extension direction of the opening).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-169289 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] However, in the aforementioned conventional vibration isolation devices, the elastic shaft portion is disposed in the recess formed in the mounting member. Therefore, the aforementioned conventional vibration isolation devices, for example, when it is desired to ensure a large cross-sectional area of ​​the elastic shaft portion to improve the spring characteristics in the compression direction, have the following problem: when the bracket and the mounting member move relative to each other during vehicle movement, the elastic shaft portion easily comes into contact with the inner wall surface of the recess.

[0008] The purpose of this invention is to provide a vibration isolation device that can prevent contact between the elastic shaft and the mounting member, and can ensure a large cross-sectional area of ​​the elastic shaft.

[0009] Solution for solving the problem

[0010] The vibration isolation device of the present invention comprises: a bracket having a fixing portion capable of being fixed to either a vibration generating portion or a vibration receiving portion, and a mounting portion forming an opening together with the fixing portion; a mounting member capable of being mounted to the other of the vibration generating portion and the vibration receiving portion and mounted in the opening formed in the bracket; and an elastic shaft portion mounted to the mounting member and extending along an axial direction inside the opening, the mounting member having a peripheral wall portion surrounding the elastic shaft portion in the circumferential direction, the peripheral wall portion having a recess extending in the axial direction at at least one location in the circumferential direction. The vibration isolation device of the present invention can prevent contact between the elastic shaft portion and the mounting member, and can ensure a large cross-sectional area of ​​the elastic shaft portion.

[0011] In the vibration isolation device of the present invention, the recess can be formed such that the peripheral wall portion is broken in the circumferential direction. In this case, contact between the elastic shaft portion and the peripheral wall portion of the mounting member can be more effectively avoided.

[0012] In the vibration isolation device of the present invention, the recess can be configured such that the peripheral wall portions are connected in the circumferential direction. In this case, contact between the elastic shaft portion and the peripheral wall portion of the mounting member can be avoided, and the stiffness of the peripheral wall portion can be adjusted by adjusting the length of the recess in the axial direction.

[0013] In the vibration isolation device of the present invention, the recesses are disposed at two locations opposite each other, separated by the elastic shaft portion, in the extending direction of the fixing portion of the bracket. In this case, contact between the elastic shaft portion and the peripheral wall portion of the mounting member can be avoided in the extending direction of the mounting portion of the bracket.

[0014] In the vibration isolation device of the present invention, the recess can be positioned opposite the fixing portion of the bracket, separated from the elastic shaft portion. In this case, contact between the elastic shaft portion and the peripheral wall of the mounting member can be avoided at the position opposite the mounting portion of the bracket, separated from the elastic shaft portion.

[0015] Preferably, in the vibration isolation device of the present invention, the vibration isolation device further comprises an elastic body, the elastic body being integrally formed with the elastic shaft portion and covering the peripheral wall portion and the recess, wherein the bracket and the mounting member are interlocked by means of the elastic body. In this case, the overall structure of the vibration isolation device can be simplified, and, for example, the impact at the contact point can be mitigated even when the elastic shaft portion contacts the peripheral wall portion of the mounting member under excessive load input.

[0016] The effects of the invention

[0017] According to the present invention, a vibration isolation device can be provided that can avoid contact between the elastic shaft portion and the mounting member, and can ensure a large cross-sectional area of ​​the elastic shaft portion. Attached Figure Description

[0018] Figure 1A This is a perspective view that schematically illustrates the vibration isolation device according to the first embodiment of the present invention.

[0019] Figure 1B Therefore, Figure 1A The vibration isolation device is broken down into the state of the support frame and the mounting components with elastic bodies. Figure 1A A three-dimensional diagram representing the vibration isolation device.

[0020] Figure 2A This is a perspective view of the mounting member with an elastic body of the vibration isolation device according to the second embodiment of the present invention.

[0021] Figure 2B It means Figure 2A A three-dimensional diagram of an elastic body.

[0022] Figure 2C It means Figure 2A A three-dimensional view of the installation components.

[0023] Figure 2D It is a general representation Figure 2A Side view of the mounting component with an elastomer.

[0024] Figure 2E yes Figure 2D XX sectional view.

[0025] Figure 2F yes Figure 2D YY sectional view.

[0026] Figure 3A This is a perspective view of the mounting member with an elastic body of the vibration isolation device according to the third embodiment of the present invention.

[0027] Figure 3B It means Figure 3A A three-dimensional diagram of an elastic body.

[0028] Figure 3C It means Figure 3A A three-dimensional view of the installation components.

[0029] Figure 3D It is a general representation Figure 3A Side view of the mounting component with an elastomer.

[0030] Figure 3E yes Figure 3D XX sectional view.

[0031] Figure 3F yes Figure 3D YY sectional view. Detailed Implementation

[0032] Hereinafter, vibration isolation devices according to various embodiments of the present invention will be described.

[0033] In this embodiment, the vibration isolation device 1 includes a bracket 2. The bracket 2 has a fixing portion 21, which can be fixed to either the vibration generating portion or the vibration receiving portion; and a mounting portion 22, which, together with the fixing portion 21, forms an opening A. Additionally, the vibration isolation device 1 includes a mounting member 3. The mounting member 3 can be mounted to the other of the vibration generating portion and the vibration receiving portion, and is mounted in the opening A formed in the bracket 2. Furthermore, the vibration isolation device 1 includes an elastic shaft portion 41. The elastic shaft portion 41 is mounted to the mounting member 3 and extends along the axial direction inside the opening A. That is, the vibration isolation device 1 essentially includes the bracket 2, the mounting member 3, and the elastic shaft portion 41. Moreover, in the vibration isolation device 1, the mounting member 3 has a peripheral wall portion 31 that surrounds the elastic shaft portion 41 in the circumferential direction. The peripheral wall portion 31 has a recess 32 extending in the axial direction at at least one location in the circumferential direction.

[0034] In this embodiment, the vibration isolation device 1 is an engine mount disposed between the engine (not shown) and the vehicle body. In this embodiment, the engine corresponds to either the vibration generating part or the vibration receiving part. Alternatively, in this embodiment, the vehicle body corresponds to the other of the vibration generating part and the vibration receiving part.

[0035] In the following description, "axial direction" refers to the extending direction of the opening A formed in the support 2. In this embodiment, the central axis O of the vibration isolation device 1 passes through the opening A formed in the support 2, and the opening A extends parallel to the central axis O. That is, in this embodiment, the "axial direction" extends parallel to the central axis O.

[0036] In this embodiment, the vibration isolation device 1 is configured such that its central axis O is parallel to the left-right direction of the vehicle when it is installed in the vehicle. Therefore, in the following description, the axis direction is also referred to as the left-right direction when the vehicle is installed.

[0037] Furthermore, in this embodiment, the fixing portion 21 of the bracket 2 is rectangular in shape when viewed from above. The fixing portion 21 extends in the longitudinal direction. Therefore, the extending direction of the fixing portion 21 (hereinafter referred to as the "fixing portion extending direction") is the longitudinal direction of the fixing portion 21. Moreover, in this embodiment, the vibration isolation device 1 is configured such that the fixing portion 21 of the bracket 2 extends in the longitudinal direction of the vehicle when it is installed in the vehicle. Therefore, in the following description, the fixing portion extending direction is also referred to as the longitudinal direction when the vehicle is installed.

[0038] Furthermore, in this embodiment, the vibration isolation device 1 is configured such that the fixing part 21 of the bracket 2 is provided on the lower side (the mounting part 22 of the bracket 2 is provided on the upper side). Therefore, in the following description, the direction orthogonal to the axial direction and the extension direction of the fixing part is also referred to as the vertical direction when installing on the vehicle.

[0039] exist Figure 1AIn the accompanying drawing, reference numeral 1A indicates a vibration isolation device according to the first embodiment of the present invention. (See also...) Figure 1A The vibration isolation device 1A includes an elastic body 4. The elastic body 4 is formed of rubber, for example, and is disposed on the mounting member 3. The elastic body 4 can be injection molded relative to the mounting member 3, for example, with the mounting member 3 as an insert. The elastic body 4 is disposed in the opening A formed in the bracket 2. In this embodiment, the bracket 2 and the mounting member 3 are fitted together by means of the elastic body 4.

[0040] In this embodiment, the bracket 2 and the mounting member 3 are connected by an elastic shaft portion 41. In this embodiment, the elastic shaft portion 41 is integrally formed with the elastic body 4. In this embodiment, the elastic shaft portion 41 is connected to the mounting member 3 as part of the elastic body 4.

[0041] Additionally, refer to Figure 1B A connecting portion 8 is provided at the front end of the elastic shaft portion 41. In this embodiment, the connecting portion 8 has a plate-shaped fixing portion 8a and a connecting portion body 8b integrally formed with the fixing portion 8a. In this embodiment, the connecting portion body 8b is composed of a threaded member. The connecting portion 8 can be integrally formed with the elastic body 4, for example, by injection molding the elastic body 4 relative to the connecting portion 8.

[0042] On the other hand, the scaffold 2 can be formed from, for example, resin (e.g., fiber-reinforced plastic), metal, etc. (See reference...) Figure 1B The opening A of the bracket 2 is formed by a fixing part 21 and a mounting part 22. In this embodiment, the fixing part 21 has: a bottom 21a, which together with the mounting part 22 divides to form the opening A; and two flange parts 21b, which extend outward relative to the bottom 21a. In this embodiment, a fixing hole 21c is formed in the flange part 21b.

[0043] In this embodiment, the bracket 2 has two sidewall portions 23. The two sidewall portions 23 are arranged at a distance from each other in the axial direction. The sidewall portions 23 are respectively fixed to the fixing portion 21 and the mounting portion 22. In this embodiment, a window 23a is formed in the sidewall portion 23. In this embodiment, the cross-sectional area of ​​the window 23a is smaller than the cross-sectional area of ​​the opening A. Furthermore, a connecting hole 23b is formed in the sidewall portion 23 for the connecting body 8b to pass through.

[0044] Mounting component 3 can be formed from, for example, metal (aluminum alloy). (Refer back to previous section) Figure 1AIn this embodiment, for the mounting member 3, the connecting portion 8 provided on the elastic shaft portion 41 passes through the connecting hole 23b, and the mounting member 3 is connected to the bracket 2 using a connecting member 9. In this embodiment, the connecting member 9 is a flanged nut. In this case, by threading the connecting member 9 into the connecting portion body 8b that passes through the connecting hole 23b, the mounting member 3 can be connected to the bracket 2. Thus, according to the vibration isolation device 1A, the spring characteristics in the left and right directions can be improved when the vehicle is installed. In this embodiment, the connecting hole 23b is an elongated hole, but it can be made into a round hole.

[0045] Furthermore, in this embodiment, the elastomer 4 has two support legs 44. In this embodiment, the two support legs 44 extend vertically when mounted on a vehicle. Figure 1A As shown, the two support legs 44 contact the side wall portion 23 when the elastic body 4 is placed in the opening A of the bracket 2. Therefore, the support legs 44 of the elastic body 4 also ensure the spring characteristics in the left and right directions when the vehicle is installed.

[0046] On the other hand, refer to Figure 1B The mounting member 3 has a peripheral wall portion 31 that surrounds the elastic shaft portion 41 in the circumferential direction. In this embodiment, the peripheral wall portion 31 has a base end 31a that is connected to the axial side plane portion 33 of the mounting member 3. The peripheral wall portion 31 extends from the base end 31a of the peripheral wall portion 31 toward the support side in the axial direction.

[0047] Furthermore, in this embodiment, the peripheral wall portion 31 is covered by an elastic body 4. In this embodiment, the elastic body 4 has a peripheral wall covering portion 42 that covers the peripheral wall portion 31. In this embodiment, the support leg portion 44 is integrally formed with the peripheral wall covering portion 42. In this embodiment, the upper surface 42f of the peripheral wall covering portion 42 presses against the inner surface of the mounting portion 22 of the bracket 2 when the elastic body 4 is placed in the opening A of the bracket 2. In addition, in this embodiment, the lower surface 44f of the support leg portion 44 presses against the bottom 21a of the fixing portion 21 of the bracket 2 when the elastic body 4 is placed in the opening A of the bracket 2. That is, the elastic body 4 is arranged in a state where it is pressed into the opening A of the bracket 2. As a result, according to the vibration isolation device 1A, the spring characteristics in the vertical direction can be improved when the vehicle is installed.

[0048] Furthermore, in this embodiment, the peripheral wall portion 31 of the mounting member 3 has a recess 32 extending in the axial direction at at least one location in the circumferential direction. In this case, when the bracket 2 and the mounting member 3 move relative to each other during vehicle travel or other times, contact between the elastic shaft portion 41 and the peripheral wall portion 31 can be avoided at the portion where the recess 32 is formed.

[0049] For example, if the goal is to improve the spring characteristics in the axial direction by ensuring a larger cross-sectional area of ​​the elastic shaft portion 41 in the direction perpendicular to the axial direction, the gap between the elastic shaft portion 41 and the peripheral wall portion 31 will decrease by an amount corresponding to the increase in the cross-sectional area of ​​the elastic shaft portion 41. In this case, the possibility of contact between the elastic shaft portion 41 and the peripheral wall portion 31 increases. Since contact between the elastic shaft portion 41 and the peripheral wall portion 31 will change the spring characteristics, it is preferable to avoid it.

[0050] In contrast, as in this embodiment, by forming a recess 32 extending in the axial direction at at least one location on the peripheral wall portion 31 of the mounting member 3, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided, and the cross-sectional area of ​​the elastic shaft portion 41 can be ensured to be large. Therefore, according to this embodiment, by ensuring a large cross-sectional area of ​​the elastic shaft portion 41, the spring characteristics in the axial direction can be improved, and the movement of the elastic shaft portion 41 can be ensured to a large extent while avoiding contact with the mounting member.

[0051] In this embodiment, the recess 32 is formed by connecting the peripheral wall portions 31 in the circumferential direction. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided, and the rigidity of the peripheral wall portion 31 can be adjusted by adjusting the length L32 in the axial direction of the recess 32.

[0052] In this embodiment, the peripheral wall portion 31 has a portion with a recess 32 and a portion without the recess 32 in the circumferential direction. In this embodiment, the front end 31b of the peripheral wall portion 31 at the portion without the recess 32 is located closer to the support side in the axial direction than the front end (bottom surface of the recess 32) 31c of the peripheral wall portion 31 at the portion with the recess 32. In other words, in this embodiment, the axial length Lb between the base end 31a and the front end 31b of the peripheral wall portion 31 is longer than the axial length Lc between the base end 31a and the front end 31c of the peripheral wall portion 31. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided, and the stiffness of the peripheral wall portion 31 can be adjusted by adjusting the axial length L32 of the recess 32.

[0053] Furthermore, in this embodiment, the recess 32 is positioned opposite the fixing portion 21 of the bracket 2, separated by the elastic shaft portion 41. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided at the position opposite the fixing portion 21 of the bracket 2, separated by the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1A is installed in a vehicle, the recess 32 is positioned in the upward direction when the vehicle is installed. Therefore, in this embodiment, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided at the upward position when the vehicle is installed.

[0054] In this embodiment, the vibration isolation device 1A also includes an elastic body 4. In this embodiment, the elastic shaft portion 41 is integrally formed with the elastic body 4. Furthermore, the elastic body 4 covers the peripheral wall portion 31 and the recess 32 of the mounting member 3. In this embodiment, the bracket 2 and the mounting member 3 are interlocked by the elastic body 4. In this case, the elastic shaft portion 41 is formed within the elastic body 4 that interlocks between the bracket 2 and the mounting member 3, thus simplifying the overall structure of the vibration isolation device 1A. Furthermore, in this case, the peripheral wall portion 31 and the recess 32 of the mounting member 3 are covered by the elastic body 4, thus mitigating the impact of contact even when the elastic shaft portion 41 contacts the peripheral wall portion 31 of the mounting member 3. Therefore, in this case, the overall structure of the vibration isolation device 1A can be simplified, and, for example, even under excessive load input, the impact of contact can be mitigated even when the elastic shaft portion 41 contacts the peripheral wall portion 31 of the mounting member 3.

[0055] In this embodiment, the peripheral wall portion 31 and the recess 32 of the mounting member 3 are covered by the peripheral wall covering portion 42 of the elastic body 4. Furthermore, in this embodiment, the axial side plane portion 33 of the mounting member 3 is covered by the axial side plane covering portion 43 of the elastic body 4. Moreover, in this embodiment, the peripheral wall covering portion 42 is integrally formed with the elastic shaft portion 41 by means of the axial side plane covering portion 43. Additionally, in this embodiment, the peripheral wall covering portion 42 is integrally formed with the support leg portion 44. Furthermore, in this embodiment, the bracket 2 and the mounting member 3 are securely fitted together by means of the elastic body 4 by pressing the elastic body 4 into the opening A of the bracket 2.

[0056] Figure 2A This is a perspective view schematically showing the mounting member 3 with an elastic body of the vibration isolation device 1B according to the second embodiment of the present invention. The bracket 2 is omitted in the following description. As the bracket 2 of this embodiment, the same bracket as the bracket of the vibration isolation device 1A can be used.

[0057] exist Figure 2AThe image shows a mounting member 3 in which the elastic body 4 is integrally formed. In this embodiment, the elastic body 4 can be integrally formed with the mounting member 3 in the same way as the vibration isolation device 1A. Alternatively, the mounting member 3 and the elastic body 4 can be formed separately and then assembled together. Figure 2B The elastomer 4 of this embodiment is shown. Figure 2C The mounting component 3 of this embodiment is shown.

[0058] In this embodiment, the recess 32 is positioned opposite the fixing portion 21 of the bracket 2, separated from the vibration isolation device 1A by the elastic shaft portion 41. That is, this embodiment, like the vibration isolation device 1A, also prevents the elastic shaft portion 41 from contacting the peripheral wall of the mounting member 3 at an upward position when the vehicle is installed.

[0059] Furthermore, in the mounting member 3 of this embodiment, the recess 32 is formed such that the peripheral wall portion 31 is broken in the circumferential direction. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be more effectively avoided.

[0060] Reference Figure 2C In the mounting member 3, the bottom surface 31c of the recess 32 coincides with the axial side plane portion 33. In this case, the peripheral wall portion 31 extending from the axial side plane portion 33 is completely disconnected at a portion of the recess 32. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be more effectively avoided.

[0061] Figure 2D It is a general representation Figure 2A The side view. That is, Figure 2D When vibration isolation device 1B is installed on a vehicle, it is positioned from the left and right sides of the vehicle during installation. Figure 2A The diagram is used for representation. Additionally, Figure 2E yes Figure 2D A sectional view of XX. Furthermore... Figure 2F yes Figure 2D YY sectional view.

[0062] Reference Figure 2E When the elastic shaft portion 41 moves (tilts) along the extension direction of the fixed portion of the vibration isolation device 1B with the mounting member 3 as the starting point, the peripheral wall portion 31 can maintain a stopping function for the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1B is installed in a vehicle, the peripheral wall portion 31 can function as a stopping member for the elastic shaft portion 41 in the longitudinal direction relative to the vehicle installation.

[0063] On the other hand, refer to Figure 2FWhen the elastic shaft portion 41 moves (tilts) to one side in a direction orthogonal to the axial direction of the vibration isolation device 1B and the extension direction of the fixing portion, starting from the mounting member 3, the peripheral wall portion 31 can maintain a stopping function for the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1B is installed in a vehicle, the peripheral wall portion 31 can function as a stopping member for the elastic shaft portion 41 in the downward direction relative to the vehicle installation.

[0064] In contrast, refer to Figure 2F When the elastic shaft portion 41 moves (tilts) to the other side from the mounting member 3 in a direction orthogonal to the axial direction of the vibration isolation device 1B and the extending direction of the fixing portion, the recess 32 does not obstruct the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1B is installed in the vehicle, the recess 32 is located in the upward direction when the vehicle is installed. Therefore, when the vibration isolation device 1B is installed in the vehicle, the elastic shaft portion 41 can move without interfering with the peripheral wall portion 31 relative to the upward direction when the vehicle is installed.

[0065] Therefore, according to the vibration isolation device 1B, contact between the elastic shaft portion 41 and the mounting member 3 can be avoided in the same way as with the vibration isolation device 1A, and the cross-sectional area of ​​the elastic shaft portion 41 can be ensured to be large. In particular, according to this embodiment, the recess 32 is formed such that the peripheral wall portion 31 is broken in the circumferential direction. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided more effectively.

[0066] Furthermore, in this embodiment, the axial-side planar portion 33 of the mounting member 3 has a protrusion 33p protruding in the axial direction. The elastic shaft portion 41 is disposed on the protrusion 33p. However, the axial-side planar portion 33 can be formed as a plane. Additionally, in this embodiment, the elastic shaft portion 41 is formed such that its front end (connecting portion 8 side) is inclined upwards towards the vehicle. However, the orientation of the inclination of the elastic shaft portion 41 can be determined, for example, based on the static load received from the engine when the vibration isolation device 1B is assembled into the vehicle. Furthermore, the elastic shaft portion 41 can be arranged parallel to the axial direction. Additionally, as... Figure 2F As shown, the peripheral wall covering portion 42 can be made locally discontinuous.

[0067] Figure 3A This is a perspective view schematically showing the mounting member 3 with an elastic body of the vibration isolation device 1C according to the third embodiment of the present invention. In the following description, the bracket 2 is also omitted, similar to that of the vibration isolation device 1B.

[0068] exist Figure 3A The image shows a mounting member 3 in which the elastic body 4 is integrally formed. In this embodiment, the elastic body 4 can be integrally formed with the mounting member 3 in the same way as the vibration isolation device 1A. Alternatively, the mounting member 3 and the elastic body 4 can be formed separately and then assembled together. Figure 3B The elastomer 4 of this embodiment is shown. Figure 3C The mounting component 3 of this embodiment is shown.

[0069] In this embodiment, the recess 32 is configured similarly to the vibration isolation device 1A to connect the peripheral wall portion 31 in the circumferential direction. That is, in this embodiment, the peripheral wall portion 31 is formed in a ring shape along the entire circumference, just like the vibration isolation device 1A.

[0070] In this embodiment, the recess 32 is positioned opposite the fixing portion 21 of the bracket 2, separated from the vibration isolation device 1A by the elastic shaft portion 41. That is, in this embodiment, similar to the vibration isolation device 1A, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 is avoided at the upward position when the vehicle is installed.

[0071] Moreover, refer to Figure 3A In this embodiment, the recesses 32 are disposed at two locations opposite each other, separated by the elastic shaft portion 41, in the extending direction of the fixing portion of the bracket 2. In this case, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can be avoided in the extending direction of the mounting portion of the bracket 2. In this embodiment, when the vibration isolation device 1C is installed in a vehicle, the recesses 32 are disposed not only at the position in the upward direction when the vehicle is installed, but also at respective positions in the longitudinal direction when the vehicle is installed. Therefore, in this embodiment, contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 can also be avoided at the positions in the longitudinal direction when the vehicle is installed.

[0072] Figure 3D It is a general representation Figure 3A The side view. That is, Figure 3D When installing the vibration isolation device 1C on a vehicle, it is aligned with the vehicle from the left and right directions during installation. Figure 3A The diagram is used for representation. Additionally, Figure 3E yes Figure 3D A sectional view of XX. Furthermore... Figure 3F yes Figure 3D YY sectional view.

[0073] Reference Figure 3E When the elastic shaft portion 41 moves (tilts) along the extension direction of the fixed portion of the vibration isolation device 1C with the mounting member 3 as the starting point, the recess 32 does not obstruct the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1C is installed on a vehicle, the elastic shaft portion 41 can move without interfering with the peripheral wall portion 31 in the upward direction relative to the vehicle installation.

[0074] Additionally, refer to Figure 3FWhen the elastic shaft portion 41 moves (tilts) to one side from the mounting member 3 in a direction orthogonal to the axial direction of the vibration isolation device 1C and the extension direction of the fixing portion, the recess 32 will not obstruct the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1C is installed on the vehicle, the elastic shaft portion 41 can move without interfering with the peripheral wall portion 31 in the upward direction relative to the vehicle installation.

[0075] In contrast, in areas where the recess 32 is absent (e.g., the area on the other side of the direction orthogonal to the axial direction of the vibration isolation device 1C and the extending direction of the fixing portion), the peripheral wall portion 31 can maintain a stopping function against the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1C is installed in a vehicle, the movement of the elastic shaft portion 41 is restricted in the downward direction during vehicle installation.

[0076] Therefore, according to the vibration isolation device 1B, the contact between the elastic shaft portion 41 and the mounting member 3 can be avoided in the same way as the vibration isolation device 1A, and the cross-sectional area of ​​the elastic shaft portion 41 can be ensured to be large.

[0077] In addition, refer to Figure 3E In this embodiment, reference numeral 31c2 indicates the front end (bottom surface of the recess 32) of the peripheral wall portion 31 in the front-rear direction when mounted on a vehicle. Additionally, refer to... Figure 3F In this embodiment, reference numeral 31c1 indicates the front end (bottom surface of the recess 32) of the peripheral wall portion 31 in the upward direction when installed on the vehicle. (Comparison) Figure 3E and Figure 3F In this embodiment, the length L32 of the recess 32 in the front-rear direction when installed on the vehicle is longer than the length L32 of the recess 32 in the upward direction when installed on the vehicle. This is a structure that prioritizes the movement of the vehicle in the front-rear direction (e.g., emergency start, emergency deceleration). However, when there are multiple recesses 32, the size relationship of the lengths L32 of the recesses 32 can be appropriately set. In addition, when there are multiple recesses 32, the lengths L32 of the recesses 32 can also be the same. That is, when there are multiple recesses 32, the length L32 of each recess 32 can be appropriately set. Furthermore, the axial side plane portion 33 of the mounting member 3 is composed of a plane, but a protrusion 33p can be formed on the axial side plane portion 33 as in the vibration isolation device 1B.

[0078] As described above, according to various embodiments of the present invention, a vibration isolation device can be provided that can prevent the elastic shaft portion 41 from contacting the mounting member 3 and can ensure a large cross-sectional area of ​​the elastic shaft portion 41.

[0079] The above description merely illustrates one embodiment of the present invention, and various modifications can be made according to the claims. For example, in the above embodiments, the recess 32 is provided with the peripheral wall portion 31 in the downward direction when the vehicle is installed as a base point. This is because, in the above embodiments, the mounting member 3 is supported by the support portion 44 of the elastic body 4. However, according to the present invention, the recess 32 can be formed in the peripheral wall portion 31 in the downward direction when the vehicle is installed. In addition, the recess 32 can be formed in any of the four directions, namely the front-rear direction and the left-right direction, when the vehicle is installed. Moreover, the recess 32 can be formed in a direction other than any of the four directions mentioned above. Furthermore, according to the present invention, when there are multiple recesses 32, at least one of the recesses 32 can be formed such that the peripheral wall portion 31 is broken in the circumferential direction, and at least one of the other recesses 32 can be formed such that the peripheral wall portion 31 is connected in the circumferential direction. Furthermore, the above embodiments have been described using the example of the peripheral wall portion 31 and the recess 32 being covered by the elastic body 4, but the peripheral wall portion 31 and the recess 32 may also not be covered by the elastic body 4. In addition, in this invention, the peripheral wall portion 31 includes an annular peripheral wall portion that surrounds the elastic shaft portion 41 along the entire circumference and a plurality of (peripheral) wall portions that intermittently surround the elastic shaft portion 41 in the circumferential direction. The plurality of (peripheral) wall portions are arranged at intervals in the circumferential direction. Furthermore, the various structures employed in the above embodiments can be appropriately interchanged or combined.

[0080] Explanation of reference numerals in the attached figures

[0081] 1A~1C, Vibration isolation device; 2, Support; 21, Fixing part; 22, Erection part; 3, Mounting component; 31, Peripheral wall part; 31a, Front end of peripheral wall part; 31b, Base end of peripheral wall part; 32, Recess; 33, Axis side plane part; 4, Elastic body; 41, Elastic shaft part; 42, Peripheral wall covering part; 43, Axis side plane covering part; 44, Support leg part; A, Opening; O, Axis of the extension direction of the opening.

Claims

1. A vibration isolation device, wherein, This vibration isolation device has the following features: A bracket having a fixing part that can be fixed to either a vibration generating part or a vibration receiving part, and a mounting part that forms an opening together with the fixing part; A mounting component, which can be mounted on the other of the vibration generating part and the vibration bearing part and is mounted on the opening formed in the bracket; and A flexible shaft portion, which is mounted on the mounting member and extends along the axial direction inside the opening, The mounting member has a peripheral wall portion that surrounds the elastic shaft portion in the circumferential direction. The peripheral wall portion has a recess extending in the axial direction at least at one location in the circumferential direction. The recess is located at two positions: one opposite to the fixing part of the bracket, separated by the elastic shaft, and the other opposite to each other, separated by the elastic shaft, in the extending direction of the fixing part of the bracket. The length of the recess in the axial direction at the position opposite to the fixing part of the bracket, which is separated by the elastic shaft, and the length of the recess in the axial direction at two positions opposite to each other, which are separated by the elastic shaft, in the extending direction of the fixing part of the bracket are not the same.

2. The vibration isolation device according to claim 1, wherein, The recess is formed such that the peripheral wall portion is broken in the circumferential direction.

3. The vibration isolation device according to claim 1, wherein, The recess is formed such that the peripheral wall portions are connected in the circumferential direction.

4. The vibration isolation device according to any one of claims 1 to 3, wherein, The vibration isolation device further comprises an elastic body, which integrally forms the elastic shaft portion and covers the peripheral wall portion and the recess. The bracket and the mounting component are interlocked by means of the elastomer.

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