JP2020097985A - Vibration-proofing device - Google Patents

Abstract

To provide a vibration-proofing device capable of making a slope of a load-deflection curve gentle when a stopper starts to regulate deflection in a rebound direction.SOLUTION: A vibration-proofing device regulates displacement of a first member in a rebound direction with respect to a second member with a stopper intervening between the first member and a contact face of a contact member. The stopper has: a first section and a second section which are compressed in between a first face and the contact face and in between the first face and the contact face respectively when the first member is displaced with respect to the second member; and a third section which is formed either on a section positioned opposite to a second face and between the first and second sections or on the second face. In a state before the first member is displaced with respect to the second member, the thickness of the second section is larger than the same of the first section. The third section is not compressed in between the second face and the contact face even with the first section compressed in between the first face and the contact face.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vibration damping device, and more particularly to a vibration damping device including a stopper that regulates displacement in a rebound direction.

BACKGROUND ART As a vibration isolation device used for an automobile, Patent Document 1 includes a first member and a second member that are arranged at a distance from each other, and an elastic body that connects the first member and the second member. A vibration-damping device including a vibration-damping base, a stopper made of an elastic body provided on the first member, and a contact member attached to the second member is disclosed. In this vibration isolator, a vibration isolation base is arranged between a vibration source side member such as a power unit and a vehicle body frame via a first member and a second member. In the vibration control device, when the first member is displaced with respect to the second member, the stopper comes into contact with the contact surface of the contact member to restrict the displacement in the rebound direction.

JP, 2005-106138, A

In this type of vibration damping device, there is a demand for a technique for reducing the inclination of the load deflection curve when the stopper starts to regulate the displacement in the rebound direction.

The present invention has been made in order to meet this demand, and an object of the present invention is to provide a vibration control device capable of reducing the inclination of a load deflection curve when the stopper starts to regulate the displacement in the rebound direction.

In order to achieve this object, a vibration isolator according to the present invention comprises a first member and a second member which are spaced apart from each other and an elastic body which connects the first member and the second member. A vibration base, a contact member attached to the second member, and a stopper made of an elastic body provided on at least one of the first member and the contact member, and the first member is displaced with respect to the second member. At this time, a stopper is interposed between the first member and the contact surface of the contact member to regulate the displacement in the rebound direction. In the state before the first member is displaced with respect to the second member, the first member has a first surface facing the contact surface, and the contact surface is larger than the distance between the first surface and the contact surface. A second surface having a long distance between the stopper and the stopper, the stopper compresses the first surface and the contact surface when the first member is displaced with respect to the second member, and A second portion that is compressed by the second surface and the contact surface when the first member is displaced with respect to the two members, and a portion that is between the first portion and the second portion and that faces the second surface Or a third portion provided on the second surface, and in a state before the first member is displaced with respect to the second member, the thickness of the second portion is thicker than the thickness of the first portion. The portion is not compressed by the second surface and the contact surface even when the first portion is compressed by the first surface and the contact surface.

According to the vibration isolator according to claim 1, in the state before the first member is displaced with respect to the second member to which the contact member is attached, between the second surface and the contact surface of the first member. Is longer than the distance between the first surface and the contact surface of the first member. The stopper includes a first portion that is compressed into the first surface and the contact surface when the first member is displaced with respect to the second member, and a second portion when the first member is displaced with respect to the second member. A second portion that is compressed into a surface and an abutting surface, and the thickness of the second portion is thicker than the thickness of the first portion in a state before the first member is displaced with respect to the second member. .. Therefore, the second portion begins to regulate the displacement in the rebound direction before the first portion. The third portion provided between the first portion and the second portion and facing the second surface or on the second surface is in a state where the first portion is compressed by the first surface and the contact surface. Even if there is, the spring constant of the second portion can be made smaller than the spring constant of the first portion because the second surface and the contact surface are not compressed. Therefore, the inclination of the load deflection curve when the stopper starts to regulate the displacement in the rebound direction can be reduced.

According to the vibration isolator according to claim 2, since the area of the second facing surface is smaller than the area of the first facing surface, the second portion is more likely to be deformed than when the first portion abutting the abutting member is deformed. Can be deformed with a small load. Therefore, in addition to the effect of claim 1, the inclination of the load deflection curve when the stopper starts to regulate the displacement in the rebound direction can be made smaller.

According to the vibration isolator of claim 3, in the state before the first member is displaced with respect to the second member, the thickness of the third portion is smaller than the thickness of the first portion. The spring constant of the second part can be reduced regardless of the existence. Therefore, in addition to the effect of claim 1 or 2, the inclination of the load deflection curve can be further reduced.

According to the vibration isolator of claim 4, the side surface of the first member that intersects the first surface and the second surface is located farther from the contact surface than the first surface, and the connecting portion of the stopper is the third surface. And a fourth portion provided on the side surface of the base. Since the connection portion is arranged at a position farther from the contact surface than the first portion, when the first portion contacts the contact member, the third portion, the fourth portion, the connection portion, and the contact surface. It is possible to prevent air from being enclosed between and. Therefore, in addition to the effect according to any one of claims 1 to 3, it is possible to suppress the generation of abnormal noise due to the air enclosed between the stopper and the contact member.

It is sectional drawing of the vibration isolator in one embodiment. It is a perspective view of a compact. FIG. 3 is a partially enlarged view of a vibration isolation device in which a portion indicated by III in FIG. 1 is enlarged. (A) is sectional drawing of a vibration isolator when the 2nd part of a stopper contact|abuts on an abutting member, (b) is a vibration isolator when the 1st part of a stopper abuts on an abutting member. FIG. It is a load deflection curve of a stopper.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a vibration isolation device 10 according to an embodiment. FIG. 1 shows a vibration isolator 10 in an unloaded state. In FIG. 1, a part of the contact member 40 is not shown.

The vibration isolation device 10 is a device that elastically supports a power unit such as an engine of an automobile. The vibration isolation device 10 includes a first member 11 and a second member 20 that are separated from each other in the direction of the axis O (axial direction), and a vibration isolation substrate 30 that connects the first member 11 and the second member 20. The contact member 40 attached to the second member 20. In the present embodiment, the first member 11 is attached to a power unit (not shown) that is a vibration source, and the second member 20 is attached to a vehicle body frame (not shown) via the contact member 40. In the present embodiment, the axis O of the shaft 13 (described later) of the first member 11 and the vertical line coincide with each other. In FIG. 1, the lower side of the paper surface is the lower side in the axial direction of the vibration isolation device 10, and the upper side of the paper surface is the upper side in the axial direction (the same applies to FIGS. 2 to 4B).

The first member 11 is a member integrally formed of an iron-based material, an aluminum alloy, or the like, and has a disk-shaped base 12 to which the vibration isolation base 30 is connected, and an axial line O protruding from the center of the base 12 to the upper side in the axial direction. A shaft 13 extending along the shaft 13 and a mounting portion 14 provided at an end of the shaft 13 are provided. The attachment portion 14 is attached to the power unit by a bolt (not shown) attached to the screw hole 15.

The second member 20 is a cylindrical metal member having an inner diameter larger than the outer diameter of the base 12 of the first member 11, and has openings 21 and 22 formed at both ends in the axial direction. The first member 11 is disposed so as to be spaced apart from the base member 12 toward the opening 21 side and axially above the second member 20. The first member 11 and the second member 20 are connected to each other by the vibration isolating substrate 30.

The vibration-proof base 30 is made of an elastic body such as rubber or thermoplastic elastomer, and is formed in a substantially truncated cone shape having a small diameter portion 31 on the upper side in the axial direction and a large diameter portion 32 on the lower side in the axial direction. The small diameter portion 31 is a portion to which the base 12 of the first member 11 is attached. The large diameter portion 32 is a portion having a larger outer diameter than the small diameter portion 31, and the outer peripheral surface of the large diameter portion 32 is bonded to the inner peripheral surface of the second member 20 on the opening 21 side. In this embodiment, the vibration-proof substrate 30 is made of rubber and is vulcanized and bonded to the first member 11 and the second member 20.

The anti-vibration substrate 30 is formed with a recess 33 that opens downward in the axial direction of the large diameter portion 32. The recess 33 has a substantially mortar shape that gradually decreases in diameter toward the upper side in the axial direction. The vibration-proof substrate 30 is provided with the seal layer 34 over the entire outer peripheral edge of the large-diameter portion 32. The seal layer 34 is a cylindrical portion extending downward in the axial direction, and covers the inner peripheral surface of the second member 20.

A diaphragm 23, which is arranged to face the recess 33 of the vibration-proof base 30, is attached to the opening 22 of the second member 20. The diaphragm 23 is a substantially circular flexible film made of an elastic material such as rubber or thermoplastic elastomer, and the fixing metal member 24 is adhered to the outer peripheral edge thereof. The fixing metal fitting 24 is formed in a substantially annular shape. The inner peripheral surface of the fixing member 24 is fixed to the outer peripheral surface of the diaphragm 23 over the entire circumference. The diaphragm 23 is fixed to the second member 20 through the fixing metal fitting 24 by reducing the diameter of the second member 20 after the fixing metal fitting 24 is inserted into the second member 20 through the opening 22.

A liquid (a non-compressible fluid such as water) is enclosed in a closed space defined by the second member 20, the vibration-proof substrate 30, and the diaphragm 23 to form a liquid chamber. The liquid chamber is partitioned by the partition member 25 into a pressure receiving chamber 26 in which the vibration isolating base 30 constitutes a part of the chamber wall, and an equilibrium chamber 27 in which the diaphragm 23 constitutes a part of the chamber wall. The partition member 25 is a substantially circular member for partitioning the liquid chamber into the pressure receiving chamber 26 and the equilibrium chamber 27 and forming an orifice 28 that connects the pressure receiving chamber 26 and the equilibrium chamber 27 to each other.

The contact member 40 includes a holding portion 41 that holds the second member 20 that is press-fitted, and a disc-shaped contact portion 42 that is arranged on the axially upper side of the base 12. The holding portion 41, the contact portion 42, and the mounting portion (not shown) of the contact member 40 are integrally formed of a metal material such as an aluminum alloy. The attachment portion of the contact member 40 is attached to the vehicle body frame. A hole 43 through which the shaft 13 of the first member 11 is inserted is formed in the center of the contact portion 42. The inner diameter of the hole 43 is smaller than the outer diameter of the base 12. The contact surface 44 of the contact portion 42 is flat and faces downward in the axial direction.

A stopper 50 is provided on the base 12 and the shaft 13 of the first member 11. The stopper 50 is made of an elastic body such as rubber or thermoplastic elastomer. In the present embodiment, the stopper 50 is made of rubber integrally molded with the vibration-proof substrate 30, and is vulcanized and bonded to the first member 11.

The stopper 50 includes a first stopper 51 provided on the outer circumference of the shaft 13 and a second stopper 52 provided on the base 12 and arranged axially below the contact portion 42. .. The first stopper 51 prevents generation of abnormal noise due to the collision between the shaft 13 of the first member 11 and the contact member 40. When the first member 11 is displaced with respect to the second member 20 in the rebound direction (upper side in the axial direction in the present embodiment) with respect to the second member 20, the second stopper 52 comes into contact with the contact surface 44 of the contact member 40 to be displaced. regulate. The second stopper 52 suppresses the tensile stress acting on the vibration isolating substrate 30 to ensure the durability of the vibration isolating substrate 30, suppresses the negative pressure generated in the pressure receiving chamber 26, and causes cavitation that causes abnormal noise. Suppress.

FIG. 2 is a perspective view of a molded body 100 in which the first member 11 and the second member 20 are integrated with the vibration-proof substrate 30. The molded body 100 is the one before the second member 20 is press-fitted into the holding portion 41 of the contact member 40 (see FIG. 1) and assembled. The second stopper 52 is interposed between the first portion 53 extending outward in the direction perpendicular to the axis of the first stopper 51, the second portion 55 extending in the axial direction, and the second portion 55 and the first portion 53. The third part 57, a fourth part 59 adjacent to the first part 53, and a connecting part 60 located between the fourth part 59 and the third part 57 are provided. The first part 53, the second part 55, the third part 57, the fourth part 59 and the connecting part 60 are integrally molded.

The first portion 53 is formed in a substantially annular shape. The second portion 55 is formed in a truncated cone shape whose diameter decreases toward the upper side in the axial direction. The fourth portion 59 is formed in a substantially cylindrical shape. The first portion 53 includes a substantially annular first facing surface 54 that faces upward in the axial direction. The second portion 55 is provided in a portion where the first facing surface 54 and the fourth portion 59 are partially cut out. The second facing surface 56, which faces the upper side in the axial direction of the second portion 55, is located axially above the first facing surface 54. The area of the second facing surface 56 is smaller than the area of the first facing surface 54.

FIG. 3 is a partially enlarged view of the vibration isolation device 10 in which the portion indicated by III in FIG. The base 12 of the first member 11 is a flat first surface 15 and a second surface 16 facing the contact surface 44 of the contact member 40, and a cylindrical side surface intersecting the first surface 15 and the second surface 16. It is equipped with 17. The first surface 15 and the second surface 16 are arranged substantially parallel to the contact surface 44. The second surface 16 is located axially below the first surface 15. The area of the first surface 15 is larger than the area of the second surface 16. The distance between the first surface 15 and the contact surface 44 is shorter than the distance between the second surface 16 and the contact surface 44.

The first portion 53 of the second stopper 52 is provided on the first surface 15 of the base 12, and the second portion 55 and the third portion 57 are provided on the second surface 16 of the base 12. The fourth portion 59 is provided on the side surface 17 of the base 12. The connecting portion 60 is provided at a portion where the side surface 17 of the base 12 and the second surface 16 intersect. In the unloaded state before the first member 11 is displaced with respect to the second member 20, the first distance D1 between the first facing surface 54 of the first portion 53 and the contact surface 44 is equal to the second portion 55. Is longer than the second distance D2 between the second facing surface 56 and the contact surface 44, and between the third facing surface 58 and the contact surface 44 of the third portion 57 facing the contact surface 44. The third distance D3 is longer than the first distance D1.

The thickness of the second portion 55 from the second surface 16 to the second facing surface 56 is larger than the thickness of the first portion 53 from the first surface 15 to the first facing surface 54. The thickness of the third portion 57 from the second surface 16 to the third facing surface 58 is smaller than the thickness of the first portion 53 from the first surface 15 to the first facing surface 54. The connecting portion 60 is arranged at a position farther from the contact surface 44 than the first portion 53.

The operation of the second stopper 52 when the first member 11 is displaced in the rebound direction with respect to the second member 20 will be described with reference to FIGS. 4 and 5. 4A is a cross-sectional view of the vibration isolator 10 when the second portion of the second stopper 52 contacts the contact member 40, and FIG. 4B is the first portion 53 of the second stopper 52. FIG. 6 is a cross-sectional view of the vibration damping device 10 when the abutting member abuts on the abutting member 40. 4A and 4B, a part of the vibration isolator 10 is shown. FIG. 5 is a load deflection curve of the second stopper 52. The horizontal axis of FIG. 5 is the axial displacement (mm) of the first member 11 with respect to the second member 20, and the vertical axis is the load (N).

Displacement 0 shown in FIG. 5 indicates an unloaded state before the first member 11 is displaced with respect to the second member 20. At the displacement A, the second facing surface 56 of the second portion 55 contacts the contact surface 44 (see FIG. 4A). Between the displacement 0 and the displacement A is a linear section due to the deformation of the vibration isolating base 30 until the second portion 55, which is separated from the contact surface 44 and the second opposing surface 56, contacts the contact surface 44. is there. At the displacement B, the first facing surface 54 of the first portion 53 contacts the contact surface 44 (see FIG. 4B). Between the displacement A and the displacement B is a non-linear section in which the second portion 55 sandwiched between the contact surface 44 and the second surface 16 is compressed.

Between the displacement B and the displacement C, the first portion 53 sandwiched between the contact surface 44 and the first surface 15 is compressed and sandwiched between the contact surface 44 and the second surface 16. The non-linear section in which the compressed second portion 55 is compressed. In the displacement C, the first portion 53 restricts further displacement of the first member 11 with respect to the second member 20. Even in the displacement C in which the first portion 53 and the second portion 55 are compressed, the third portion 57 is not compressed.

In the vibration isolator 10, in a state before the first member 11 is displaced with respect to the second member 20, the first distance D1 between the first facing surface 54 of the first portion 53 and the contact surface 44 is It is longer than the second distance D2 between the second facing surface 56 of the second portion 55 and the contact surface 44. Therefore, in the displacement A, the second portion 55 comes into contact with the contact surface 44 before the first portion 53, and starts to regulate the displacement in the rebound direction.

The third distance D3 between the third facing surface 58 of the third portion 57 provided on the second surface 16 and the contact surface 44 is longer than the first distance D1, and further the first portion 53 is provided. The distance between the contact surface 44 and the second surface 16 where the second portion 55 and the third portion 57 are provided is longer than the distance between the surface 15 and the contact surface 44. As a result, the third part 57 can be prevented from exerting a large influence on the characteristics of the second part 55, and thus the spring constant of the second part 55 can be made smaller than the spring constant of the first part 53. Therefore, the inclination of the load deflection curve when the second stopper 52 starts to regulate the displacement in the rebound direction can be reduced.

On the other hand, in the case where the second portion 55 is not provided, as shown by the broken line in FIG. 5, there is a linear section between the displacement 0 and the displacement B due to the deformation of the vibration isolating base 30. At displacement B, the first facing surface 54 of the first portion 53 contacts the contact surface 44, and when the displacement B is exceeded, the first portion 53 is compressed and the load rapidly increases. The load deflection curve without the second portion 55 intersects the load deflection curve of the vibration isolator 10 at point D. Therefore, the vibration isolator 10 makes the slope of the load deflection curve from the displacement A to the point D smaller than the slope of the load deflection curve from the displacement B to the point D when the second portion 55 is not provided (broken line in FIG. 5). it can.

Since the vibration isolator 10 has the second portion 55, when the load is smaller than the load at the point D (see FIG. 5 ), the displacement can be made smaller than when the second portion 55 is not provided (broken line in FIG. 5 ). When the load is the same, it is possible to suppress the tensile stress generated in the vibration isolating substrate 30 between the displacement 0 and the point D, as compared with the case where the second portion 55 is not provided. Therefore, the durability of the vibration-proof substrate 30 can be improved.

Since the third portion 57 provided between the first portion 53 and the second portion 55 is arranged on the second surface 16, the second portion 55 generated when the second portion 55 is axially compressed. The increase in the cross-sectional area of the can be prevented by the third portion 57. Therefore, the spring constant in the axial direction of the second portion 55 when the second portion 55 is compressed can be kept small.

Since the area of the second facing surface 56 is smaller than the area of the first facing surface 54, the second portion 55 can be deformed with a smaller load than when the first portion 53 contacting the contact surface 44 is deformed. Therefore, the inclination of the load deflection curve when the second stopper 52 starts to regulate the displacement in the rebound direction can be made smaller.

Since the thickness of the third portion 57 from the second surface 16 to the third facing surface 58 is smaller than the thickness of the first portion 53 from the first surface 15 to the first facing surface 54, from the third facing surface 58 The thickness of the second portion 55 up to the second facing surface 56 of the second portion 55 can be secured. As a result, the spring constant of the second portion 55 can be further reduced, so that the inclination of the load deflection curve when the second stopper 52 starts to regulate the displacement in the rebound direction can be further reduced.

The side surface 17 of the base 12 that intersects the first surface 15 and the second surface 16 is located farther from the contact surface 44 than the first surface 15, and the connecting portion 60 is the fourth portion 59 and the fourth portion 59 provided on the side surface 17. Adjacent to the third part 57. Since the connecting portion 60 is located farther from the contact surface 44 than the first portion 53, when the first portion 53 contacts the contact surface 44 (see FIG. 4B), Air can be prevented from being enclosed between the third portion 57, the fourth portion 59, the connecting portion 60 and the contact surface 44. Therefore, it is possible to suppress the generation of abnormal noise due to the air enclosed between the second stopper 52 and the contact surface 44.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments, and various improvements and modifications are possible without departing from the spirit of the present invention. It can be easily guessed.

In the embodiment, the case where the contact member 40 fixed to the second member 20 is attached to the vehicle body frame has been described, but the embodiment is not necessarily limited to this. For example, it is naturally possible to use a fixing member (not shown) that connects the body frame and the second member 20. In this case, the attachment portion (not shown) of the contact member 40 is omitted, and instead, the fixing member (not shown) is provided with a portion to be attached to the vehicle body frame. As a result, the second member 20 is fixed to the vehicle body frame via the fixing member. The contact member 40 is attached to the second member 20 via a fixing member (not shown), or directly attached to the second member 20.

Although the case where the first member 11 is attached to the vibration source such as the power unit and the second member 20 is attached to the vehicle body frame has been described in the embodiment, the present invention is not limited to this. On the contrary, it is naturally possible to attach the second member 20 to the vibration source and the first member 11 to the vehicle body frame.

In the embodiment, the case of the liquid filled type vibration damping device in which the liquid is sealed between the vibration damping substrate 30 and the diaphragm 23 has been described, but the present invention is not limited to this. It is of course possible to omit the diaphragm 23 and the partition member 25 and apply the stopper 50 to a non-liquid-filled type vibration damping device that uses only the vibration damping base 30 (characteristics of the elastic body).

In the embodiment, the case where the second portion 55 is formed in a truncated cone shape has been described, but the present invention is not limited to this. Various shapes such as a cylindrical shape and a prismatic shape are appropriately set for the second portion 55.

In the embodiment, the case where the vibration-proof substrate 30 and the second stopper 52 are integrally molded has been described, but the invention is not necessarily limited to this. Of course, the material of the elastic body of the second stopper 52 may be different from the material of the elastic body of the vibration-proof substrate 30. In this case, the second stopper 52 is formed separately from the vibration isolation base 30.

In the embodiment, the case where all of the first portion 53, the second portion 55, and the third portion 57 of the second stopper 52 are provided on the first surface 15 and the second surface 16 of the first member 11 has been described. It is not limited to this. It is naturally possible to provide all of the first portion 53, the second portion 55, and the third portion 57 on the contact surface 42 of the contact member 40. Even when the contact surface 42 of the contact member 40 is provided with the first portion 53, the second portion 55, and the third portion 57, the first portion 53 is compressed into the contact surface 42 and the first surface 15, The second portion 55 is compressed into the contact surface 42 and the second surface 16. The third portion 57 is provided at a portion of the contact surface 42 facing the second surface 16. Further, it is naturally possible to provide the contact surface 42 of the contact member 40 with one of the first portion 53 and the second portion 55, and provide the first member 11 with the other of the first portion 53 and the second portion 55. is there.

Although the case where the second stopper 52 is bonded to the first member 11 has been described in the embodiment, the present invention is not limited to this. It is naturally possible to attach the second stopper 52 to the first member 11 or the contact member 40 without adhering the second stopper 52 to the first member 11 or the contact member 40.

10 Vibration proof device 11 1st member 15 1st surface 16 2nd surface 17 Side surface 20 2nd member 30 Vibration proof base 40 Contact member 42 Contact surface 50 Stopper 53 1st part 55 2nd part 57 3rd part 59th 4 parts 60 connection parts

Claims (4)

A first member and a second member spaced apart from each other;
A vibration-damping base made of an elastic body that connects the first member and the second member,
An abutting member attached to the second member,
A stopper made of an elastic body provided on at least one of the first member and the abutting member,
When the first member is displaced with respect to the second member, the stopper is interposed between the contact surface of the contact member and the first member to restrict displacement in the rebound direction. And
In a state before the first member is displaced with respect to the second member, the first member has a first surface facing the contact surface, and a first surface between the first surface and the contact surface. A second surface whose distance from the contact surface is longer than the distance,
The stopper includes a first portion that is compressed into the first surface and the contact surface when the first member is displaced with respect to the second member, and the first member with respect to the second member. A second part that is compressed by the second surface and the abutting surface when displaced, and a part between the first part and the second part that faces the second surface or the second part. A third part provided on two sides,
In a state before the first member is displaced with respect to the second member, the thickness of the second portion is larger than the thickness of the first portion,
The vibration isolator in which the third portion is not compressed by the second surface and the contact surface even when the first portion is compressed by the first surface and the contact surface. The vibration isolator according to claim 1, wherein the area of the second facing surface is smaller than the area of the first facing surface. The vibration isolation device according to claim 1, wherein the thickness of the third portion is thinner than the thickness of the first portion in a state before the first member is displaced with respect to the second member. The first member includes a side surface that intersects with the first surface and the second surface and that is located further from the contact surface than the first surface,
The stopper is provided on the first member, and includes a fourth portion provided on the side surface, and a connecting portion adjacent to the fourth portion and the third portion,
The vibration isolator according to any one of claims 1 to 3, wherein the connecting portion is arranged at a position farther from the contact surface than the first portion.

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