Anti-vibration device

Abstract

To provide a vibration isolating device capable of ensuring a large cross-sectional area of an elastic shaft portion while avoiding the contact of the elastic shaft portion and an attaching member.SOLUTION: A vibration isolating device 1A comprises: a bracket 2 that has a fixing portion 21 and a hanging-over portion 22 forming an opening A with the fixing portion 21; an attaching member 3 that is attached to the opening A formed on the bracket 2; and an elastic shaft portion 41 that is attached to the attaching member 3 and extends in an axial direction inside the opening A. The attaching member 3 has a peripheral wall portion 31 surrounding the elastic shaft portion 41 in a circumferential direction. The peripheral wall portion 31 has a recessed portion extending in the axial direction in at least one place in the circumferential direction.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates to an anti-vibration device. [Background technology]

[0002] In some conventional vibration isolation devices, a mounting member is press-fitted into an opening formed in a bracket via an elastic body, and the mounting member and the bracket are connected by an elastic shaft (see, for example, Patent Document 1). This ensures spring characteristics in the press-fit direction of the mounting member (extension direction of the opening). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-169289 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional vibration-damping device, the elastic shaft portion is provided in a recess formed in the mounting member, and therefore, in the conventional vibration-damping device, when an attempt is made to improve the spring characteristics in the press-fitting direction by, for example, ensuring a large cross-sectional area of ​​the elastic shaft portion, there is a problem that the elastic shaft portion is likely to come into contact with the inner wall surface of the recess when there is relative movement between the bracket and the mounting member, for example, when the vehicle is traveling.

[0005] An object of the present invention is to provide an anti-vibration device capable of ensuring a large cross-sectional area of ​​an elastic shaft portion while avoiding contact between the elastic shaft portion and a mounting member. [Means for solving the problem]

[0006] The anti-vibration device according to the present invention comprises a bracket having a fixing part that can be fixed to either a vibration generating part or a vibration receiving part and a bridge part that forms an opening together with the fixing part, a mounting member that can be attached to the other of the vibration generating part or the vibration receiving part and is attached to the opening formed in the bracket, and an elastic shaft part that is attached to the mounting member and extends in the axial direction inside the opening, the mounting member having a peripheral wall part that surrounds the elastic shaft part in the circumferential direction, and the peripheral wall part has a recess extending in the axial direction in at least one place in the circumferential direction. The anti-vibration device according to the present invention can ensure a large cross-sectional area of ​​the elastic shaft part while avoiding contact between the elastic shaft part and the mounting member.

[0007] In the vibration-damping device according to the present invention, the recess may be formed so as to divide the peripheral wall portion in the circumferential direction, thereby more effectively preventing contact between the elastic shaft portion and the peripheral wall portion of the mounting member.

[0008] In the vibration-damping device according to the present invention, the recess may be formed so that the peripheral wall portion is continuous in the circumferential direction. In this case, the rigidity of the peripheral wall portion can be adjusted by adjusting the axial length of the recess while avoiding contact between the elastic shaft portion and the peripheral wall portion of the mounting member.

[0009] In the vibration-proof device according to the present invention, the recesses are disposed at two positions facing each other across the elastic shaft in the extending direction of the fixing part of the bracket, thereby making it possible to avoid contact between the elastic shaft and the peripheral wall of the mounting member in the extending direction of the mounting part of the bracket.

[0010] In the vibration-damping device according to the present invention, the recess may be disposed at a position facing the fixed portion of the bracket across the elastic shaft portion, in which case contact between the elastic shaft portion and a peripheral wall portion of the mounting member can be avoided at a position facing the mounting portion of the bracket across the elastic shaft portion.

[0011] In the vibration-isolating device according to the present invention, it is preferable that the vibration-isolating device further includes an elastic body that is integrally formed with the elastic shaft and covers the peripheral wall and the recess, and the bracket and the mounting member are fitted together via the elastic body. In this case, while simplifying the overall configuration of the vibration-isolating device, it is possible to reduce the impact of contact between the elastic shaft and the peripheral wall of the mounting member when, for example, an excessive load is input. Effect of the Invention

[0012] According to the present invention, it is possible to provide a vibration-proof device that can ensure a large cross-sectional area of ​​the elastic shaft portion while avoiding contact between the elastic shaft portion and the mounting member. [Brief description of the drawings]

[0013] [Figure 1A] 1 is a perspective view showing a schematic configuration of a vibration isolation device according to a first embodiment of the present invention; [Figure 1B] 2 is a perspective view showing the vibration isolation device of FIG. 1 in a disassembled state into a bracket and a mounting member with an elastic body. FIG. [Figure 2A] FIG. 11 is a perspective view showing a schematic view of a mounting member with an elastic body of a vibration-proof device according to a second embodiment of the present invention. [Figure 2B] FIG. 2B is a perspective view showing the elastic body of FIG. 2A. [Figure 2C] FIG. 2B is a perspective view showing the mounting member of FIG. 2A. [Figure 2D] 2B is a side view showing the elastic body-attaching member of FIG. 2A. FIG. [Figure 2E] XX cross-sectional view of FIG. 2D. [Figure 2F] FIG. 2B is a cross-sectional view of FIG. 2D taken along the line YY. [Figure 3A] FIG. 11 is a perspective view showing a schematic view of a mounting member with an elastic body of a vibration-proof device according to a third embodiment of the present invention. [Figure 3B] FIG. 3B is a perspective view showing the elastic body of FIG. 3A. [Figure 3C] FIG. 3B is a perspective view showing the mounting member of FIG. 3A. [Figure 3D] 3B is a side view showing the elastic body-attaching member of FIG. 3A. FIG. [Figure 3E] XX cross-sectional view of FIG. 3D. [Figure 3F] FIG. 3D is a cross-sectional view taken along the line YY. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, vibration isolation devices according to various embodiments of the present invention will be described.

[0015] In this embodiment, the vibration-proof device 1 includes a bracket 2. The bracket 2 includes a fixing portion 21 that can be fixed to either the vibration generating portion or the vibration receiving portion, and a bridging portion 22 that forms an opening A together with the fixing portion 21. The vibration-proof device 1 also includes a mounting member 3. The mounting member 3 can be attached to the other of the vibration generating portion or the vibration receiving portion, and is attached to the opening A formed in the bracket 2. The vibration-proof device 1 also includes an elastic shaft portion 41. The elastic shaft portion 41 is attached to the mounting member 3 and extends in the axial direction inside the opening A. That is, the vibration-proof device 1 basically includes the bracket 2, the mounting member 3, and the elastic shaft portion 41. Furthermore, in the vibration-proof device 1, the mounting member 3 includes 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 that extends in the axial direction at least at one location in the circumferential direction.

[0016] In this embodiment, the vibration isolation device 1 is an engine mount disposed between an engine (not shown) and a vehicle body. In this embodiment, the engine corresponds to either the vibration generating part or the vibration receiving part. In addition, in this embodiment, the vehicle body corresponds to the other of the vibration generating part and the vibration receiving part.

[0017] In the following description, the "axial direction" refers to the extension direction of the opening A formed in the bracket 2. In this embodiment, the central axis O of the vibration isolation device 1 passes through the opening A formed in the bracket 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.

[0018] In this embodiment, the vibration isolation device 1 is disposed so that the central axis O is parallel to the left-right direction of the vehicle when mounted on the vehicle. Therefore, in the following description, the axial direction is also referred to as the left-right direction when mounted on the vehicle.

[0019] Moreover, in this embodiment, the fixing portion 21 of the bracket 2 is formed in a rectangular shape in a plan view. The fixing portion 21 extends in the longitudinal direction. Therefore, the extension direction of the fixing portion 21 (hereinafter, the "fixing portion extension direction") is the longitudinal direction of the fixing portion 21. Furthermore, in this embodiment, the vibration isolation device 1 is disposed such that the fixing portion 21 of the bracket 2 extends in the fore-and-aft direction of the vehicle when mounted on the vehicle. Therefore, in the following description, the fixing portion extension direction is also referred to as the fore-and-aft direction when mounted on the vehicle.

[0020] Furthermore, in this embodiment, the vibration isolation device 1 is disposed so that the fixing portion 21 of the bracket 2 is on the lower side (the bridging portion 22 of the bracket 2 is on the upper side). Therefore, in the following description, the direction perpendicular to the axial direction and the extending direction of the fixing portion is also referred to as the up-down direction when mounted on a vehicle.

[0021] In Fig. 1A, reference symbol 1A denotes an anti-vibration device according to a first embodiment of the present invention. Referring to Fig. 1A, the anti-vibration device 1A includes an elastic body 4. The elastic body 4 is formed, for example, from rubber, and is provided on a mounting member 3. The elastic body 4 can be, for example, injection molded into the mounting member 3, with the mounting member 3 serving as an insert part. The elastic body 4 is disposed in an opening A formed in a bracket 2. In this embodiment, the bracket 2 and the mounting member 3 are fitted together via the elastic body 4.

[0022] In this embodiment, the bracket 2 and the mounting member 3 are connected via an elastic shaft portion 41. In this embodiment, the elastic shaft portion 41 is formed integrally with the elastic body 4. In this embodiment, the elastic shaft portion 41 is connected to the mounting member 3 as a part of the elastic body 4.

[0023] 1B, a connecting portion 8 is provided at the tip of the elastic shaft portion 41. In this embodiment, the connecting portion 8 has a plate-shaped fixing portion 8a and a connecting portion main body 8b formed integrally with the fixing portion 8a. In this embodiment, the connecting portion main body 8b is formed by a screw. The connecting portion 8 can be formed integrally with the elastic body 4, for example, by injection molding the connecting portion 8.

[0024] Meanwhile, the bracket 2 can be formed of, for example, resin (e.g., fiber-reinforced plastic), metal, etc. Referring to Fig. 1B, an opening A of the bracket 2 is formed by a fixing portion 21 and a bridging portion 22. In this embodiment, the fixing portion 21 has a bottom portion 21a that defines the opening A together with the bridging portion 22, and two flange portions 21b that extend outward beyond the bottom portion 21a. In this embodiment, a fixing hole 21c is formed in the flange portion 21b.

[0025] In this embodiment, the bracket 2 has two side walls 23. The two side walls 23 are arranged with a gap between them in the axial direction. The side walls 23 are fixed to the fixing part 21 and the bridging part 22, respectively. In this embodiment, a window 23a is formed in the side wall 23. In this embodiment, the window 23a has a smaller cross-sectional area than the opening A. In addition, the side wall 23 is formed with a connection hole 23b for passing the connection part main body 8b therethrough.

[0026] The mounting member 3 can be made of, for example, a metal (aluminum alloy). Referring back to FIG. 1A, in this embodiment, the mounting member 3 is connected to the bracket 2 by passing the connecting portion 8 provided on the elastic shaft portion 41 through the connecting hole 23b and using a connecting member 9. In this embodiment, the connecting member 9 is a flanged nut. In this case, the mounting member 3 can be connected to the bracket 2 by screwing the connecting member 9 into the connecting portion main body 8b passed through the connecting hole 23b. This makes it possible for the vibration-proof device 1A to improve the spring characteristics in the left-right direction when mounted on a vehicle. In this embodiment, the connecting hole 23b is an elongated hole, but it can be a round hole.

[0027] Furthermore, in this embodiment, the elastic body 4 has two legs 44. In this embodiment, the two legs 44 extend in the up-down direction when attached to the vehicle. As shown in FIG. 1A, the two legs 44 are in contact with the side wall portion 23 when the elastic body 4 is disposed in the opening A of the bracket 2. Therefore, the legs 44 of the elastic body 4 also ensure the spring characteristics in the left-right direction when attached to the vehicle.

[0028] 1B, the mounting member 3 has a peripheral wall portion 31 that circumferentially surrounds the elastic shaft portion 41. In this embodiment, the peripheral wall portion 31 has a base end 31a that is continuous with the axial side flat portion 33 of the mounting member 3. The peripheral wall portion 31 extends from the base end 31a of the peripheral wall portion 31 to the bracket side in the axial direction.

[0029] Furthermore, in this embodiment, the peripheral wall portion 31 is covered by the 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 leg portion 44 is formed integrally with the peripheral wall covering portion 42. In this embodiment, the upper surface 42f of the peripheral wall covering portion 42 presses the inner surface of the bridging portion 22 of the bracket 2 when the elastic body 4 is placed in the opening A of the bracket 2. Also, in this embodiment, the lower surface 44f of the leg portion 44 presses the bottom portion 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 placed in a state of being pressed into the opening A of the bracket 2. As a result, according to the vibration isolation device 1A, it is possible to improve the spring characteristics in the vertical direction when mounted on a vehicle.

[0030] Furthermore, in this embodiment, the peripheral wall portion 31 of the mounting member 3 has a recessed portion 32 extending in the axial direction at least at one location in the circumferential direction. In this case, when the bracket 2 and the mounting member 3 move relative to each other, such as when the vehicle is traveling, contact between the elastic shaft portion 41 and the peripheral wall portion 31 can be avoided in the portion where the recessed portion 32 is formed.

[0031] For example, when attempting to improve the spring characteristics in the axial direction by ensuring a large cross-sectional area of ​​the elastic shaft portion 41 in the direction perpendicular to the axis, the gap between the elastic shaft portion 41 and the peripheral wall portion 31 becomes smaller as the cross-sectional area of ​​the elastic shaft portion 41 increases. In this case, the possibility of contact between the elastic shaft portion 41 and the peripheral wall portion 31 increases. Contact between the elastic shaft portion 41 and the peripheral wall portion 31 is preferably avoided because it changes the spring characteristics.

[0032] In contrast, as in this embodiment, by forming a recess 32 extending in the axial direction in at least one location on the peripheral wall portion 31 of the mounting member 3, it is possible to ensure a large cross-sectional area of ​​the elastic shaft portion 41 while avoiding contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3. Therefore, according to this embodiment, by ensuring a large cross-sectional area of ​​the elastic shaft portion 41, it is possible to improve the spring characteristics in the axial direction, while ensuring large movement of the elastic shaft portion 41 and avoid contact with the mounting member.

[0033] In this embodiment, the recess 32 is formed so as to be continuous in the circumferential direction with the peripheral wall portion 31. In this case, the rigidity of the peripheral wall portion 31 can be adjusted by adjusting the axial length L32 of the recess 32 while avoiding contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3.

[0034] In this embodiment, the peripheral wall portion 31 has a portion in which the recess 32 is formed and a portion in which the recess 32 is not formed in the peripheral direction. In this embodiment, the tip 31b of the peripheral wall portion 31 in the portion in which the recess 32 is not formed (the axial bracket side end) of the tip of the peripheral wall portion 31 is located closer to the bracket in the axial direction than the tip (bottom surface of the recess 32) 31c of the peripheral wall portion 31 in the portion in which the recess 32 is formed. In other words, in this embodiment, the axial length Lb between the base end 31a and the tip 31b of the peripheral wall portion 31 is longer than the axial length Lc between the base end 31a and the tip 31c of the peripheral wall portion 31. In this case, the rigidity of the peripheral wall portion 31 can be adjusted by adjusting the axial length L32 of the recess 32 while avoiding contact between the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3.

[0035] In addition, in this embodiment, the recess 32 is disposed at a position facing the fixed portion 21 of the bracket 2 across 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 a position facing the fixed portion 21 of the bracket 2 across the elastic shaft portion 41. In this embodiment, when the vibration isolation device 1A is mounted on a vehicle, the recess 32 is disposed at a position in the upward direction when mounted on the vehicle. 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 a position in the upward direction when mounted on the vehicle.

[0036] In this embodiment, the vibration-proof device 1A further includes an elastic body 4. In this embodiment, the elastic shaft portion 41 is integrally formed with the elastic body 4. The elastic body 4 covers the peripheral wall portion 31 and the recessed portion 32 of the mounting member 3. In this embodiment, the bracket 2 and the mounting member 3 are fitted to each other via the elastic body 4. In this case, the elastic shaft portion 41 is formed in the elastic body 4 fitted between the bracket 2 and the mounting member 3, so that the overall configuration of the vibration-proof device 1A can be simplified. In this case, the peripheral wall portion 31 and the recessed portion 32 of the mounting member 3 are covered by the elastic body 4, so that even when the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 come into contact with each other, the impact of the contact can be alleviated. Therefore, in this case, while simplifying the overall configuration of the vibration-proof device 1A, even when the elastic shaft portion 41 and the peripheral wall portion 31 of the mounting member 3 come into contact with each other when an excessive load is input, for example, the impact of the contact can be alleviated.

[0037] In this embodiment, the peripheral wall portion 31 and the recessed portion 32 of the mounting member 3 are covered by the peripheral wall covering portion 42 of the elastic body 4. Also, in this embodiment, the axis side flat portion 33 of the mounting member 3 is covered by the axis side flat surface covering portion 43 of the elastic body 4. Furthermore, in this embodiment, the peripheral wall covering portion 42 is formed integrally with the elastic shaft portion 41 via the axis side flat surface covering portion 43. Also, in this embodiment, the peripheral wall covering portion 42 is formed integrally with the leg portion 44. Also, in this embodiment, the bracket 2 and the mounting member 3 are firmly fitted together via the elastic body 4 by pressing the elastic body 4 into the opening A of the bracket 2.

[0038] 2A is a perspective view that shows a schematic view of an elastic-body-attached mounting member 3 of an anti-vibration device 1B according to a second embodiment of the present invention. In the following description, the bracket 2 is omitted. As the bracket 2 according to this embodiment, a bracket similar to that of the anti-vibration device 1A can be used.

[0039] Fig. 2A shows a mounting member 3 integrally formed with an elastic body 4. In this embodiment, the elastic body 4 can be formed integrally with the mounting member 3, similar to the vibration isolation device 1A. Alternatively, the mounting member 3 and the elastic body 4 can be formed separately and then assembled together. Fig. 2B shows the elastic body 4 according to this embodiment. Fig. 2C shows the mounting member 3 according to this embodiment.

[0040] In this embodiment, similar to the vibration-proof device 1A, the recess 32 is disposed at a position facing the fixed part 21 of the bracket 2 across the elastic shaft part 41. That is, similar to the vibration-proof device 1A, this embodiment also makes it possible to avoid contact between the elastic shaft part 41 and the peripheral wall part of the mounting member 3 at an upward position when mounted on a vehicle.

[0041] Furthermore, in the mounting member 3 according to this embodiment, the recess 32 is formed so as to divide the peripheral wall portion 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 more effectively avoided.

[0042] 2C, in the mounting member 3, the bottom surface 31c of the recess 32 coincides with the axis-side flat portion 33. In this case, the peripheral wall portion 31 extending from the axis-side flat portion 33 is completely divided at 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.

[0043] Fig. 2D is a side view showing Fig. 2A in a schematic manner. That is, Fig. 2D is a view showing Fig. 2A from the left and right direction when the vibration isolation device 1B is installed on a vehicle. Fig. 2E is a cross-sectional view taken along line XX in Fig. 2D. Fig. 2F is a cross-sectional view taken along line YY in Fig. 2D.

[0044] 2E, when the elastic shaft portion 41 moves (inclines) from the mounting member 3 in the direction in which the fixed portion of the vibration isolator 1B extends, the peripheral wall portion 31 can maintain a stopper function against the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolator 1B is mounted on a vehicle, the peripheral wall portion 31 can function as a stopper for the elastic shaft portion 41 in the front-rear direction when mounted on the vehicle.

[0045] 2F, when the elastic shaft portion 41 moves (tilts) to one side from the mounting member 3 in a direction perpendicular to the axial direction of the vibration isolator 1B and the direction in which the fixed portion extends, the peripheral wall portion 31 can maintain a stopper function against the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolator 1B is mounted on a vehicle, the peripheral wall portion 31 can function as a stopper for the elastic shaft portion 41 in the downward direction when mounted on the vehicle.

[0046] 2F, when the elastic shaft portion 41 moves (tilts) from the mounting member 3 to the other side in a direction perpendicular to the axial direction of the vibration-proof device 1B and the direction in which the fixed portion extends, the recess 32 does not impede the movement of the elastic shaft portion 41. In this embodiment, the recess 32 is located in an upward direction when the vibration-proof device 1B is mounted on a vehicle. This allows the elastic shaft portion 41 to move in the upward direction when mounted on the vehicle without being interfered with by the peripheral wall portion 31 when the vibration-proof device 1B is mounted on a vehicle.

[0047] Therefore, similar to the vibration-proof device 1A, the vibration-proof device 1B can ensure a large cross-sectional area of ​​the elastic shaft portion 41 while avoiding contact between the elastic shaft portion 41 and the mounting member 3. In particular, according to this embodiment, the recess 32 is formed so that the peripheral wall portion 31 is divided 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.

[0048] In this embodiment, the axial side flat portion 33 of the mounting member 3 has a protruding portion 33p that protrudes in the axial direction. The elastic shaft portion 41 is disposed on the protruding portion 33p. However, the axial side flat portion 33 can be configured as a flat surface. In this embodiment, the elastic shaft portion 41 is formed so that its tip (the connecting portion 8 side) is inclined toward the upward direction when mounted on the vehicle. However, the inclination direction of the elastic shaft portion 41 can be determined, for example, according to the static load received from the engine when the vibration isolator 1B is mounted on the vehicle. In addition, the elastic shaft portion 41 can be disposed parallel to the axial direction. In addition, the peripheral wall covering portion 42 can be locally discontinuous as shown in FIG. 2F.

[0049] 3A is a perspective view that shows a schematic view of an elastic-body-attached mounting member 3 of an anti-vibration device 1C according to a third embodiment of the present invention. In the following description, the bracket 2 is omitted, as in the case of the anti-vibration device 1B.

[0050] Fig. 3A shows a mounting member 3 with which an elastic body 4 is integrally formed. In this embodiment, the elastic body 4 can be formed integrally with the mounting member 3, similar to the vibration isolation device 1A. Alternatively, the mounting member 3 and the elastic body 4 can be formed separately and then assembled together. Fig. 3B shows the elastic body 4 according to this embodiment. Fig. 3C shows the mounting member 3 according to this embodiment.

[0051] In this embodiment, similar to the vibration isolating device 1A, the recess 32 is formed so that the peripheral wall portion 31 is continuous in the circumferential direction. That is, in this embodiment, the peripheral wall portion 31 is formed in an annular shape over the entire circumferential direction, similar to the vibration isolating device 1A.

[0052] In this embodiment, similar to the vibration-proof device 1A, the recess 32 is disposed at a position facing the fixed part 21 of the bracket 2 across the elastic shaft part 41. That is, similar to the vibration-proof device 1A, this embodiment also makes it possible to avoid contact between the elastic shaft part 41 and the peripheral wall part 31 of the mounting member 3 at an upward position when mounted on a vehicle.

[0053] 3A, in this embodiment, the recesses 32 are arranged at two positions facing each other across the elastic shaft portion 41 in the fixing portion extending direction 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 mounting portion extending direction of the bracket 2. In this embodiment, when the vibration isolator 1C is mounted on a vehicle, the recesses 32 are arranged at positions in the front-rear direction when mounted on the vehicle, in addition to the position in the upward direction when mounted on the vehicle. 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 even in the position in the front-rear direction when mounted on the vehicle.

[0054] Fig. 3D is a side view showing Fig. 3A in a schematic manner. That is, Fig. 3D is a view showing Fig. 3A from the left and right direction when the vibration isolator 1C is mounted on a vehicle. Fig. 3E is a cross-sectional view taken along line XX in Fig. 3D. Fig. 3F is a cross-sectional view taken along line YY in Fig. 3D.

[0055] 3E, when the elastic shaft portion 41 moves (inclines) from the mounting member 3 in the direction in which the fixed portion of the vibration-proof device 1C extends, the recess 32 does not impede the movement of the elastic shaft portion 41. In this embodiment, when the vibration-proof device 1C is mounted on a vehicle, the elastic shaft portion 41 can move upward without being interfered with by the peripheral wall portion 31.

[0056] 3F, even when the elastic shaft portion 41 moves (tilts) to one side from the mounting member 3 in a direction perpendicular to the axial direction of the vibration-proof device 1C and the direction in which the fixed portion extends, the recess 32 does not impede the movement of the elastic shaft portion 41. In this embodiment, when the vibration-proof device 1C is mounted on a vehicle, the elastic shaft portion 41 can move upward without being interfered with by the peripheral wall portion 31.

[0057] In contrast, in a portion where the recess 32 does not exist (for example, a portion on the other side in the direction perpendicular to the axial direction of the vibration isolating device 1C and the direction in which the fixed portion extends), the peripheral wall portion 31 can maintain a stopper function against the movement of the elastic shaft portion 41. In this embodiment, when the vibration isolating device 1C is mounted on a vehicle, the movement of the elastic shaft portion 41 is restricted in the downward direction when mounted on the vehicle.

[0058] Therefore, according to the vibration isolating device 1B, like the vibration isolating device 1A, contact between the elastic shaft portion 41 and the mounting member 3 can be avoided while ensuring that the cross-sectional area of ​​the elastic shaft portion 41 is large.

[0059] 3E, in this embodiment, the tip (bottom surface of the recess 32) 31c of the peripheral wall 31 in the front-rear direction when mounted on the vehicle is indicated by the reference symbol 31c2. Also, in this embodiment, the tip (bottom surface of the recess 32) 31c of the peripheral wall 31 in the upward direction when mounted on the vehicle is indicated by the reference symbol 31c1. Comparing FIG. 3E and FIG. 3F, in this embodiment, the length L32 of the recess 32 in the front-rear direction when mounted on the vehicle is longer than the length L32 of the recess 32 in the upward direction when mounted on the vehicle. This is a configuration that prioritizes movement in the front-rear direction of the vehicle (e.g., sudden start and sudden deceleration). However, when there are multiple recesses 32, the magnitude relationship of the lengths L32 of the recesses 32 can be set appropriately. Also, when there are multiple recesses 32, the lengths L32 of the recesses 32 may be the same. That is, when there are multiple recesses 32, the lengths L32 of the recesses 32 can be set appropriately. Furthermore, the axis-side flat surface portion 33 of the mounting member 3 is configured as a flat surface, but like the vibration isolator 1B, a protrusion 33p can be formed on the axis-side flat surface portion 33.

[0060] As described above, according to each embodiment of the present invention, it is possible to provide a vibration-proof device that can ensure a large cross-sectional area of ​​the elastic shaft portion 41 while avoiding contact between the elastic shaft portion 41 and the mounting member 3.

[0061] The above is merely an example of one embodiment of the present invention, and various modifications are possible within the scope of the claims. For example, in each of the above-mentioned embodiments, the recess 32 is set based on the peripheral wall portion 31 in the downward direction when mounted on the vehicle. This is because, in each of the above-mentioned embodiments, the mounting member 3 is supported via the leg 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 mounted on the vehicle. Also, the recess 32 can be formed in a position in any one of four directions among the front-rear direction and the left-right direction when mounted on the vehicle. Furthermore, the recess 32 can be formed in a position in a direction other than any one of the above-mentioned four directions. Also, according to the present invention, when there are a plurality of recesses 32, at least one of the recesses 32 can be formed so that the peripheral wall portion 31 is divided in the circumferential direction, and at least one of the other recesses 32 can be formed so that the peripheral wall portion 31 is continuous in the circumferential direction. In addition, in each of the above-mentioned embodiments, the peripheral wall portion 31 and the recessed portion 32 are covered by the elastic body 4, but the peripheral wall portion 31 and the recessed portion 32 do not have to be covered by the elastic body 4. In the present invention, the peripheral wall portion 31 includes an annular peripheral wall portion that surrounds the elastic shaft portion 41 over the entire circumference in the circumferential direction, and a plurality of (peripheral) wall portions that surround the elastic shaft portion 41 intermittently in the circumferential direction. Here, the multiple (peripheral) wall portions are arranged at intervals in the circumferential direction. Furthermore, the various configurations adopted in each of the above-mentioned embodiments can be appropriately replaced with each other or combined. [Explanation of symbols]

[0062] 1A to 1C: vibration isolation device, 2: bracket, 21: fixed portion, 22: bridge portion, 3: mounting member, 31: peripheral wall portion, 31a: tip end of peripheral wall portion, 31b: base end of peripheral wall portion, 32: recess, 33: axial side flat portion, 4: elastic body, 41: elastic shaft portion, 42: peripheral wall covering portion, 43: axial side flat covering portion, 44: leg portion, A: opening, O: axis in extension direction of opening,

Claims

1. a bracket having a fixing portion that can be fixed to either one of the vibration generating portion or the vibration receiving portion, and a bridge portion that forms an opening together with the fixing portion; a mounting member that can be attached to the other of the vibration generating portion and the vibration receiving portion and that is attached to the opening formed in the bracket; a resilient shaft portion attached to the mounting member and extending axially inside the opening, The mounting member has a peripheral wall portion that circumferentially surrounds the elastic shaft portion, The peripheral wall portion has a recess extending in an axial direction at at least one location in a circumferential direction. The vibration isolation device further includes an elastic body with which the elastic shaft portion is integrally formed, the bracket and the mounting member are fitted to each other via the elastic body by the elastic body being press-fitted into the opening of the bracket, The recess is formed so that the peripheral wall portion is continuous in the circumferential direction, and the peripheral wall portion has, in the circumferential direction, a portion where the recess is formed and a portion where the recess is not formed, and the recesses include a first recess disposed at two positions facing each other across the elastic shaft portion in an extension direction of the fixing portion of the bracket, and a second recess disposed at a position facing the fixing portion of the bracket across the elastic shaft portion, a bottom surface of the first recess and a bottom surface of the second recess are each a tip end of the peripheral wall portion, A vibration-damping device in which, when the tip of the peripheral wall portion of a portion where the recess is not formed is used as a reference, the length to the bottom surface of the first recess in the axial direction of the first recess and the length to the bottom surface of the second recess in the axial direction of the second recess are different from each other.

2. The vibration isolation device according to claim 1 , wherein the recess is formed so as to divide the peripheral wall portion in the circumferential direction.

3. 3. The vibration isolation device according to claim 1, wherein an axial length of the first recess is longer than an axial length of the second recess.

4. The vibration-isolating device according to claim 1 , wherein the elastic body covers the peripheral wall and the recess.

5. The elastic body has two legs extending toward the fixed portion in a direction perpendicular to the axial direction, 5. An anti-vibration device as described in any one of claims 1 to 4, wherein the bracket and the mounting member are fitted to each other via the elastic body by pressing the two legs of the elastic body into the opening of the bracket.

6. A connecting portion is provided at a tip end of the elastic shaft portion in an axial direction, A connection hole is provided at the axial end of the bracket, 6. The vibration-proof device according to claim 1, wherein the bracket and the mounting member are connected to each other by screwing the connecting portion into the connecting hole.

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