JP2008144899A - Vibration isolating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct a relative positional deviation between an inner tube fitting and an upper bracket without substantially changing a shape of the upper bracket, and also without adversely affecting stopper performance or deteriorating durability. <P>SOLUTION: A rubber elastic body 8 is arranged between the inner tube fitting 6 and an outer tube fitting 7, and the upper bracket 15 regulating movement of the inner tube fitting of a predetermined amount or more is also arranged in a neighborhood of the inner tube fitting. A fluid lubricant 20 is interposed between abutting faces of an outer circumference rubber layer 11 attached to the inner tube fitting and the upper bracket 15. Since frictional force between the outer circumference rubber layer 11 and the upper bracket 15 is small, even if the outer circumference rubber layer 11 and the upper bracket 15 are deviated from initial setting positions, the positional deviations are automatically corrected by elastic force of the rubber elastic body 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator used for mounting a vibration generating unit such as an automobile engine.

2. Description of the Related Art Conventionally, various types of vibration isolators that support an automobile engine on the vehicle body side with vibrations attenuated to some extent have been used.
For example, a first mounting member connected to one of the vehicle body and the engine, a second mounting member connected to the other of the vehicle body and the engine, a first mounting member, and a second mounting member. In addition to the vibration isolator main body provided with the elastic rubber body to be elastically connected, the first mounting member is disposed in the vicinity of the first mounting member, for example, the second mounting member with a support load when supporting the engine When the first mounting member is about to move in the direction opposite to the displacement direction, a rebound stopper member is provided that contacts the first mounting member and restricts further movement of the first mounting member. There is something.

  This type of vibration isolator equipped with a rebound stopper member is assembled in advance in the form of an assembly by assembling an engine side bracket connected to the engine or a vehicle body side bracket connected to the vehicle body to the vibration isolator body. Sometimes it is transported to the line where it is assembled to the car body along with the engine.

  Here, in the anti-vibration device in the form of an assembly before being assembled into the vehicle body, since the supporting load by the engine is not applied, the first mounting member is strongly against the reband stopper member by the biasing force of the rubber elastic body. It is being pressed. For example, a pressing force is applied to the engine-side bracket or the like for some reason such as during conveyance, causing a positional deviation or an angular deviation between the first mounting member and the rebound stopper member that are incorporated in the initial setting state in advance. Sometimes. Thus, when a relative positional shift or the like occurs between the first mounting member and the rebound stopper member, the engine side bracket connected to the first mounting member and the vehicle body side connected to the rebound stopper member Positional displacement occurs with the bracket, which hinders assembly work on the vehicle body. In other words, the bolt insertion holes that are formed in advance on the engine side bracket and the car body side bracket do not match the screw receiving parts on the car body side and the engine side, and the assembly work to the car body and the engine in the car body assembly line, especially automatic assembly using a robot It interferes with work.

  By the way, when a positional deviation or the like occurs between the first mounting member and the rebound stopper member, it may be possible to manually restore the original setting position. However, as described above, the biasing force of the rubber elastic body Thus, the first mounting member is strongly pressed against the reband stopper member, so that it cannot be easily restored.

As a countermeasure for such a problem, Patent Document 1 discloses a first rubber that is attached to the first attachment member or the rebound stopper member (a stopper rubber) and a first attachment that comes into contact with the buffer rubber. Proposed is to provide an uneven portion that engages with each other between the contact surfaces of the member or the rebound stopper member, thereby preventing relative displacement between the first mounting member and the rebound stopper member. Yes.
Japanese Patent No. 3517549

In the vibration isolator described in Patent Document 1, in order to provide an engagement uneven portion on the buffer rubber and the rebound stopper member, the shape of the mold for forming the buffer rubber and the rebound stopper member is formed. Since it needs to be changed, the cost is significantly increased compared to the conventional product. Further, if the engaging concave and convex portions are too small, the position shift prevention function cannot be exhibited. On the other hand, if the concave and convex portions for engagement are too large, there is a problem that the stopper performance is adversely affected or the durability is inferior.
That is, for example, in the actual operating state after the engine is supported, there is no guarantee that the bumps and bumps corresponding to each other of the buffer rubber and the rebound stopper member will always come into contact with each other. May hit. At this time, the tip of the convex portion hits the other side first, and then the opposing surfaces abut over the front surface with some time thereafter, changing the characteristics as a stopper. In addition, when bumping in a misaligned state or bumping while misaligning, the protrusion formed on the rebound stopper member may give a shearing force to the shock absorbing rubber and damage the shock absorbing rubber. The problem comes out in terms of.

  The present invention has been made in view of the above-described problems, and does not require a significant change in the shape of the rebound stopper member, and does not adversely affect the stopper performance or deteriorate the durability. The relative displacement between one mounting member and the rebound stopper can be corrected automatically, or even if it cannot be corrected automatically, the relative position can be reduced by applying a slight force manually. An object of the present invention is to provide a vibration isolator capable of easily correcting a deviation.

The present invention employs the following means in order to solve the above problems.
The vibration isolator according to the present invention includes a first attachment member connected to one of the vibration generator and the vibration receiver, and a second attachment connected to the other of the vibration generator and the vibration receiver. A rubber elastic body disposed between the first mounting member and the second mounting member and elastically connecting the first mounting member and the second mounting member; When the first mounting member is disposed in the vicinity of the first mounting member, and the first mounting member tries to move in a direction opposite to the displacement direction of the first mounting member relative to the second mounting member due to a support load by a predetermined amount or more. A rebound stopper member that abuts on the first attachment member and restricts further movement of the first attachment member, and the opposing surfaces of the first attachment member and the rebound stopper member Stopper rubber is attached to either one of Characterized in that the lubricity enhancing material between the contact surface of the other of the stopper rubber and the first mounting member and the rebound stopper member is interposed.

  According to the present invention, since the lubricity improving material is interposed between the contact surfaces of the stopper rubber and the first mounting member and the other of the rebound stopper member, for example, before the assembly to the vehicle body, Even when the stopper rubber and the other one of the first mounting member and the rebound stopper member are in strong contact with each other by the biasing force of the rubber elastic body when no support load is applied, the frictional force between them is reduced. it can.

  For this reason, when transported in a state of being assembled in the form of an assembly, for example, a pressing force is applied to the first mounting member via the engine side bracket, and a torsional force or a lateral force acts, Even if the relative position between the stopper rubber and the other of the first mounting member and the rebound stopper member is deviated, when the pressing force is subsequently removed, the restoring force of the rubber elastic body causes the stopper rubber to The relative position of the attachment member and the other of the rebound stopper member automatically returns to the original set position. Or, even when the relative position between the stopper rubber and the other of the first mounting member and the rebound stopper member does not return to the original setting position when the pressing force is removed, only a slight force is applied manually. Thus, the relative position between the stopper rubber and the other of the first attachment member and the rebound stopper member can be returned to the original set position.

In the vibration isolator according to the present invention, it is preferable that the lubricity improving material is composed of a fluid lubricant.
In this case, a fluid lubricant can be interposed at a required location by a simple means such as application or injection.

In the vibration isolator according to the present invention, it is preferable that the lubricity improving material is composed of a solid lubricant.
In this case, the lubricant can be interposed at a required location simply by sandwiching a solid lubricant between the stopper rubber and the other one of the attachment member and the rebound stopper member.

In the vibration isolator according to the present invention, a lubricant holding groove for holding the fluid lubricant is formed on a contact surface of the first mounting member and the rebound stopper member with the other stopper rubber. It is preferable.
In this case, for example, in order to apply the fluid lubricant, the lubricant holding groove can be used as a guide, and the workability of the lubricant application is improved. Further, the applied lubricant can be held at a required place for a long time, and the frictional force between the stopper rubber and the other of the first mounting member and the rebound stopper member can be reduced over a long period of time.

In the vibration isolator according to the present invention, it is preferable that the lubricity improving material is composed of self-lubricating rubber in which a lubricant is mixed in rubber.
In this case, since the rubber itself has lubricity, the lubricity can be exhibited even in an actual operating state after the engine is supported without being limited to, for example, during transportation. Generation of abnormal noise caused by friction between the other of the rebound stopper members and the stopper rubber can be prevented.

  The vibration isolator according to the present invention includes a first attachment member connected to one of the vibration generator and the vibration receiver, and a second attachment connected to the other of the vibration generator and the vibration receiver. A rubber elastic body disposed between the first mounting member and the second mounting member and elastically connecting the first mounting member and the second mounting member; When the first mounting member is disposed in the vicinity of the first mounting member, and the first mounting member tries to move in a direction opposite to the displacement direction of the first mounting member relative to the second mounting member due to a support load by a predetermined amount or more. A rebound stopper member that abuts on the first attachment member and restricts further movement of the first attachment member, and the opposing surfaces of the first attachment member and the rebound stopper member A stopper rubber is interposed between the Rubber characterized in that it is constituted by a self-lubricating rubber lubricant is mixed.

  According to the present invention, since the stopper rubber is made of self-lubricating rubber mixed with a lubricant, the number of parts is not increased and the number of work steps is increased as compared with the conventional vibration isolator. It can be implemented with only a slight increase in cost. Further, since the rubber itself has lubricity, the lubricity can be exhibited even in an actual operation state after the engine is supported, and the stopper rubber, the first mounting member, and the other of the rebound stopper member Generation of abnormal noise caused by friction between the two can be prevented.

  According to the present invention, the first mounting member and the rebound stopper member do not require a significant change in the shape of the rebound stopper member, and do not adversely affect the stopper performance or deteriorate the durability. It is possible to automatically correct the relative positional deviation with respect to. Alternatively, even if it cannot be automatically corrected, the relative displacement can be easily corrected by applying a slight force manually.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to the drawings.
1 is an exploded perspective view of a part of the vibration isolator, FIG. 2 is a sectional view taken along the line II-II when the vibration isolator shown in FIG. 1 is assembled as an assembly, and FIG. 3 is a diagram of the vibration isolator. 2 is a cross-sectional view taken from a direction different from 90 degrees.

  In FIG. 1, reference numeral 1 is an engine side bracket attached to an engine which is an example of a vibration generating unit, 2 is a vibration isolator body that supports the engine in a state where vibration is attenuated via the engine side bracket 1, and 3 is an anti-vibration unit. A vehicle body side bracket for attaching the vibration device main body 2 to a vehicle body which is an example of a vibration receiving portion is shown.

As shown in FIG. 2, the vibration isolator body 2 includes an inner cylindrical metal fitting (first attachment member) 6 at the head, an outer cylindrical metal fitting (second attachment member) 7 at the bottom, and the inner cylindrical metal fitting 6 and the outside. This is a basic configuration provided with a rubber elastic body 8 which is integrally formed on the tube fitting 7 by vulcanization adhesion.
The rubber elastic body 8 is housed in a state in which two liquid chambers are connected to each other via an orifice. For example, when vibration of the engine is input from the inner tube fitting 6 via the engine side bracket 1. A configuration in which liquid column resonance is generated by vibrating the liquid in the liquid chamber in the orifice, and thereby the vibration is attenuated to some extent, and transmitted to the outer cylindrical fitting 7 at the bottom is used. In addition, as the rubber elastic body 8, one constituted only by a rubber material without having a liquid chamber may be used as necessary.

  As shown in FIG. 2, the outer shape of the inner cylindrical metal fitting 6 is formed in a substantially rectangular parallelepiped shape, and a bracket insertion hole 9 is formed in a substantially central portion so as to penetrate a square shape. Is formed with a projecting portion 10 having a substantially arc-shaped cross section projecting downward in the drawing. The inner cylinder fitting 6 is made of aluminum or an aluminum alloy.

  As shown in FIG. 3, the bracket insertion hole 9 is disposed offset from the center of the attachment portion of the inner cylindrical metal fitting 6 to the rubber elastic body 8, that is, the center L of the overhang portion 10 toward the engine side bracket 1. . Further, the bracket insertion hole 9 is arranged offset to the engine side bracket 1 side along the central axis M thereof.

  A part of the rubber elastic body 8 interposed between the outer cylinder fitting 7 and the outer circumference and inner circumference of the inner cylinder fitting 6 wraps around the outer rubber layer (stopper rubber) 11 and the inner circumference. The rubber layer 12 is formed. As shown in FIG. 1, a plurality of grooves 12 a extending along the central axis M of the bracket insertion hole 9 are formed at predetermined intervals in the inner rubber layer 12. Thereby, irregularities are formed on the inner surface of the rubber layer 12. The thickness of the rubber layer 12 on the inner periphery and the size of the irregularities are appropriately set in consideration of the tightening allowance when the insertion portion 18 of the engine bra bracket 1 and the bracket insertion hole 9 of the inner cylinder fitting 6 are fitted. The

  As shown in FIG. 1, the vehicle body side bracket 3 is fitted to the outer periphery of the upper portion of the outer cylinder fitting 7, and a lower bracket 14 for fixing the outer cylinder fitting 7 to the vehicle body side, and screwing or the like to the lower bracket 14 as appropriate. The upper bracket 15 is fixed by an appropriate fixing means such as an upper bracket (rebound stopper member) 15 that is fixed by a fixing means and restricts the movement of the inner cylindrical fitting 6 beyond a predetermined amount, and is fixed to the lower bracket 14 by screws or the like. A side bracket 16 for restricting movement of the insertion portion 18 of the side bracket 1 along the insertion direction.

As shown in FIG. 1, the upper bracket 15 has an upper plate portion 15a and left and right side plate portions 15b and 15c, and is formed in a substantially U shape as a whole. The upper bracket 15 is fixed to the lower bracket 14 so that the upper plate portion 15a and the side plate portions 15b and 15c are arranged at appropriate intervals on the upper surface and the left and right side surfaces of the inner tube fitting 6, respectively. When the cylinder fitting 6 is about to move by a predetermined amount or more, the engine-side bracket is brought into contact with the inner cylinder fitting 6 via the rubber layer 11 on the outer periphery, and is thereby inserted and fitted into the inner cylinder fitting 6 and the inner cylinder fitting. Regulate the movement of 1.
In particular, the upper plate portion 15a is inward in a direction (direction indicated by Xb in FIG. 2) opposite to the displacement direction (direction indicated by arrow Xa in FIG. 2) of the inner cylinder fitting 6 with respect to the outer cylinder fitting 7 due to the engine support load. This is a portion that abuts against the inner cylinder fitting 6 to restrict further movement of the inner cylinder fitting 6 when the cylinder fitting 6 tries to move more than a predetermined amount.

  2 and 3 show the vibration isolator in an assembled state before the engine is supported, in which the engine side bracket 1 and the vehicle body side bracket 3 are assembled to the vibration isolator main body 2, respectively. Here, the inner cylindrical metal fitting 6 is strongly pressed against the lower surface 15aa of the upper plate portion 15a of the upper bracket 15 via the outer rubber layer 11 by the urging force of the rubber elastic body 8. When the engine is assembled and a load accompanying the weight of the engine is applied, the rubber elastic body 8 is compressed, and there is a gap between the upper plate portion 15a and the rubber layer 11 on the outer periphery of the upper side of the inner tube fitting 6. It is formed.

Between the upper surface 11a of the outer peripheral rubber layers 11 and the lower surface 15aa of the upper plate portion 15a, a lubricant 20 having fluidity such as grease is interposed. Further, as shown in FIG. 4, a lubricant holding groove 21 that holds the lubricant 20 is formed on the lower surface 15aa of the upper plate portion 15a. For example, as shown in FIG. 4, the lubricant holding groove 21 may be configured by a plurality of ring-shaped grooves 21 a having different diameters, or a predetermined surface having a shallow groove knurled surface. It may be constituted by a ring-shaped groove having a single width. Further, as shown in FIG. 5, a ring-shaped groove 21a and a plurality of radial grooves 21b extending radially from the center of the ring-shaped groove 21a may be combined. In the case where the ring-shaped groove 21a and the radial groove 21b are combined in this way, the ring-shaped groove 21a is formed in the ring-shaped groove 21a by using the injection means 22 such as an injection needle in a process after the vibration isolator is assembled in the form of an assembly. It is possible to inject the lubricant 20 having fluidity.
The application or injection of the lubricant 20 may be performed when the vibration isolator is assembled in the form of an assembly, or at an appropriate process thereafter.

The engine-side bracket 1 is inserted into a bracket main body 17 having a plurality of bolt insertion holes 17a to be attached to the engine, and a bracket insertion hole 9 of the inner cylinder fitting 6 of the vibration isolator main body 2 extending from the bracket main body 17. The insertion part 18 is provided.
The insertion portion 18 is formed in a quadrangular shape whose outer shape is slightly smaller than that of the bracket insertion hole 9 so as to correspond to the bracket insertion hole 9 of the inner cylindrical metal fitting 6.
The vehicle body side bracket 3 and the engine side bracket 1 are each made of, for example, aluminum or an aluminum alloy in order to reduce the weight.

Next, the operation of the vibration isolator having the above configuration will be described.
The engine is provided with a plurality of vibration isolators as described above, and is thus supported in a state in which vibration is damped with respect to the vehicle body.
For example, when vibration is generated from the engine, the vibration is transmitted from the insertion portion 18 of the engine-side bracket 1 to the inner tubular fitting 6 of the vibration isolator body 2 through the inner rubber layer 12. In the vibration isolator body 2, the liquid in the two liquid chambers formed in the vibration isolator body 2 vibrates in the orifice connecting the liquid chambers, thereby generating liquid column resonance. Thereby, the vibration of the inner cylinder fitting 6 is transmitted to the outer cylinder fitting 7 at the bottom in a state where the vibration is attenuated to some extent. As a result, engine vibration can be reduced.

  As shown in FIGS. 2 and 3, the vibration isolator having the above-described structure is constructed by assembling the engine side bracket 1 and the vehicle body side bracket 3 to the vibration isolation device main body 2 to form a vehicle assembly line or the like. Be transported. In this state, the engine support load is not applied, and the inner cylinder fitting 6 is strongly pressed against the lower surface 15aa of the upper plate portion 15a of the upper bracket 15 through the outer rubber layer 11 by the urging force of the rubber elastic body 8. It has been applied.

  Here, a fluid lubricant 20 is interposed between the upper surface 11a of the outer peripheral rubber layer 11 and the lower surface 15aa of the upper plate portion 15a which are strongly pressed against each other. For this reason, the frictional force between the outer peripheral rubber layer 11 and the upper plate portion 15a of the upper bracket 15 is small.

  Therefore, when the vibration isolator is conveyed in the state of being assembled in the form of an assembly, for example, a pressing force is applied to the inner cylinder fitting 6 via the engine-side bracket 1, and a torsional force or a lateral force is generated. Even if the relative position between the rubber layer 11 on the outer periphery of the inner cylinder fitting 6 and the upper plate portion 15a of the upper bracket 15 shifts due to the action, the rubber elastic body 8 is restored when the pressing force is removed thereafter. Due to the force, the relative position between the rubber layer 11 on the outer periphery of the inner cylinder fitting 6 and the upper plate portion 15a of the upper bracket 15 automatically returns to the initial setting position. Alternatively, even if the relative position between the rubber layer 11 on the outer periphery of the inner cylinder fitting 6 and the upper plate portion 15a of the upper bracket 15 does not automatically return to the initial setting position when the pressing force is removed, By simply applying a slight force, the relative position of the two can be returned to the original initial setting position.

Further, according to the vibration isolator having the above-described configuration, since the lubricant retaining groove 21 is formed on the lower surface 15aa of the upper plate portion 15a of the upper bracket 15, for example, the lubricant 20 having fluidity is added to the upper plate portion 15a. When applying to a required portion of the lower surface 15aa, the lubricant holding groove 21 can be applied as a guide, and the workability of applying the lubricant is improved.
Further, the applied lubricant can be held at a required place for a long time, and the frictional force between the rubber layer 11 on the outer periphery of the inner cylindrical metal fitting 6 and the upper bracket 15 can be reduced over a long period of time.

The present invention is not limited to the above-described embodiment, and can be appropriately changed in design without departing from the spirit of the invention.
For example, in the above-described embodiment, the fluid lubricant 20 is interposed between the outer peripheral rubber layer 11 and the upper bracket 15 attached to the outer side of the inner cylindrical fitting 6, but the present invention is not limited to this. As shown in FIG. 6, a lubricant 23 made of a solid material having a small friction coefficient such as hexafluoroethylene resin may be interposed between the outer rubber layer 11 and the upper bracket 15a. Further, a plate-like self-lubricating rubber having lubricity itself by appropriately mixing a lubricant (for example, oleic acid, stearic acid, etc.) may be interposed.
Moreover, you may comprise the rubber layer 11 of an outer periphery with the said self-lubricating rubber.

In the above embodiment, the stopper rubber (outer rubber layer 11) for reducing the impact at the time of the collision between the upper bracket 15 and the inner cylinder fitting 6 is attached to the inner cylinder fitting 6 side. Alternatively, a stopper rubber may be attached to the upper bracket 15 side. In this case, the fluid lubricant 20 is interposed between the stopper rubber attached to the upper bracket side and the inner cylinder fitting 6.
The same applies to the case where the lubricant 23 made of the solid material or the plate-like self-lubricating rubber is used.

Further, in the embodiment, in order to assemble the engine side bracket 1 to the inner cylinder fitting 6, the insertion section 18 is provided in the engine side bracket 1, and the insertion section 18 is inserted into the bracket insertion hole 9 of the inner cylinder fitting 6. However, the present invention is not limited to this, and both may be assembled using fastening means such as bolts or nuts.
In the above embodiment, the inner cylinder fitting 6 is connected to the engine side and the outer cylinder fitting 7 is connected to the vehicle body side. However, the present invention is not limited to this. In addition, the outer cylinder fitting 7 may be connected to the vehicle body side.
Further, in the above embodiment, the upper bracket 15 that restricts the movement of the inner cylinder fitting 6 by a predetermined amount or more is fixed to the lower bracket 14, but the upper bracket 15 is not limited to this and is attached to the outer cylinder fitting 7. It may be attached directly.

It is the perspective view which decomposed | disassembled one part which shows the vibration isolator of embodiment of this invention. It is sectional drawing which follows the II-II line when the vibration isolator is assembled | attached as an assembly. It is sectional drawing cut | disconnected from the direction different from FIG. 2 of the vibration isolator 90 degree | times. It is the perspective view seen from the diagonal lower part of the upper bracket. It is a perspective view which shows the modification of an upper bracket. It is sectional drawing which shows the modification of a vibration isolator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine side bracket 2 Anti-vibration apparatus main body 3 Car body side bracket 6 Inner cylinder metal fitting (1st attachment member)
7 Outer cylinder fitting (second mounting member)
8 Rubber elastic body 9 Bracket insertion hole 11 Outer rubber layer (stopper rubber)
12 Inner rubber layer 14 Lower bracket 15 Upper bracket (Rebound stopper)
16 Side bracket 17 Bracket body 18 Engine bracket insertion part 20 Lubricant (lubricant improver)
21 Lubricant holding groove 23 Lubricant made of a solid material (lubricant improving material)

Claims (6)

A first attachment member coupled to either one of the vibration generator and the vibration receiver;
A second attachment member coupled to the other of the vibration generating portion and the vibration receiving portion;
A rubber elastic body disposed between the first mounting member and the second mounting member to elastically connect the first mounting member and the second mounting member;
The first mounting member is disposed in the vicinity of the first mounting member, and the first mounting member tends to move a predetermined amount or more in a direction opposite to the displacement direction of the first mounting member relative to the second mounting member due to a support load. A rebound stopper member that contacts the first mounting member and restricts further movement of the first mounting member;
A stopper rubber is attached to either one of the opposing surfaces of the first attachment member and the rebound stopper member,
A vibration isolator comprising a lubricity improving material interposed between contact surfaces of the stopper rubber and the other of the first attachment member and the rebound stopper member.   The vibration isolator according to claim 1, wherein the lubricity improving material is composed of a fluid lubricant.   The vibration isolator according to claim 1, wherein the lubricity improving material is made of a solid lubricant.   The lubricant holding groove for holding the fluid lubricant is formed on the contact surface of the first attachment member and the rebound stopper member with the other stopper rubber. 2. The vibration isolator according to 2.   2. The vibration isolator according to claim 1, wherein the lubricity improving material is made of self-lubricating rubber in which a lubricant is mixed in rubber. A first attachment member coupled to either one of the vibration generator and the vibration receiver;
A second attachment member coupled to the other of the vibration generating portion and the vibration receiving portion;
A rubber elastic body disposed between the first mounting member and the second mounting member to elastically connect the first mounting member and the second mounting member;
The first mounting member is disposed in the vicinity of the first mounting member, and the first mounting member tends to move a predetermined amount or more in a direction opposite to the displacement direction of the first mounting member relative to the second mounting member due to a support load. A rebound stopper member that contacts the first mounting member and restricts further movement of the first mounting member;
A stopper rubber is interposed between the opposing surfaces of the first mounting member and the rebound stopper member,
A vibration isolator comprising the stopper rubber made of self-lubricating rubber mixed with a lubricant.

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