JP2008106927A - Vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve both the damping performance and durability of a vibration damper for supporting a compressor unit of an air suspension against a vehicle body. <P>SOLUTION: An upper bush 20 is secured to a bracket 10 of the compressor unit, and a lower bush 22 is abutted against a panel member of a vehicle body through a washer 21. A coil spring 23 is interposed between the upper and lower bushes 20, 22. A pipe member 24 is inserted through the upper and lower bushes and the coil spring. A bolt is inserted through the pipe member 24 and screwed into the panel member of the vehicle body. The compressor unit is resiliently supported floatingly by the coil spring 23. Vibration of the compressor unit is damped by friction generated by sliding contact between raised portions 30 of the upper bush 20 and the pipe member 24. When the vibration amplitude is large, the projection 27 of the upper bush 20 abuts against the projection 31 of the lower bush 22 to suppress the vibration while absorbing impact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator for suppressing transmission of vibration from a vibration source such as a compressor to a mounting portion of a vehicle body, for example, when a vehicle height adjustment compressor unit of an air suspension device of an automobile is attached to the vehicle body. It is about.

There is an air suspension device that can adjust the vehicle height by supplying and discharging compressed air to and from an air spring by a compressor. In the air suspension device, a vibration isolating device is provided so that vibration during operation of the compressor is not transmitted to the vehicle body. A conventional vibration isolator provided in an air suspension device suppresses transmission of vibration from a vibration source such as a compressor to a vehicle body by interposing a rubber or a coil spring between the vibration source such as a compressor and the vehicle body. I am doing so. For example, Patent Document 1 describes an example in which vibration transmission is suppressed by rubber.
JP 2004-60524 A

However, the conventional vibration isolator has the following problems. If rubber is used, vibration-proof performance can be improved by using soft rubber. However, since durability is reduced, it is actually necessary to use hard rubber in consideration of durability. Therefore, sufficient vibration isolation performance cannot be obtained. In addition, when the amplitude increases due to the start, stop, and load fluctuation of the compressor, a soft rubber may not provide a sufficient damping effect. On the other hand, with the use of a coil spring, high vibration isolation performance and durability can be obtained, but vibration on the compressor side cannot be damped, so pipes, hoses, electric wires, etc. connected to the compressor are always connected. There is a problem that deterioration is likely to occur due to the influence of vibration, and there is a possibility that the apparatus may be adversely affected by vibration.
In addition, the above-mentioned problems include in-vehicle fluids such as a pump that supplies hydraulic pressure to a brake mounted on an automobile, a vacuum pump that supplies negative pressure to a brake booster, and a hydraulic pump that supplies hydraulic pressure to a power steering. This is a problem common to devices having a pump.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vibration isolator having high vibration isolation performance and excellent durability.

In order to solve the above-mentioned problem, a vibration isolator according to the invention of claim 1 is a vibration isolator interposed between a first member and a second member to be damped, wherein the first An elastic member attached to the member, a support means for supporting the first member and the second member with a spring property via the elastic member, and attached to each of the first and second members. And a pair of friction members that slide with each other by vibration.
A vibration isolator according to a second aspect of the present invention is the vibration isolator according to the first aspect, wherein the elastic member has an annular shape, and the friction member on the first member side is constituted by an inner peripheral portion of the elastic member. The friction member of the second member is a rod member that is slidably inserted into the inner peripheral portion of the elastic member and attached to the second member.
A vibration isolator according to a third aspect of the present invention is the vibration isolator according to the second aspect, wherein a plurality of protrusions extending in the axial direction in contact with the bar member are formed on the inner periphery of the elastic member. It is characterized by that.
A vibration isolator according to a fourth aspect of the present invention is the vibration isolator according to the second aspect, wherein a projection extending in the circumferential direction is formed on the inner periphery of the elastic member so as to contact the rod member. It is characterized by.
A vibration isolator according to a fifth aspect of the present invention is the vibration isolator according to any one of the first to fourth aspects, wherein the elastic member is in contact with the second member side, and the first member and the first member A restricting portion for restricting relative movement between the two members is provided.

A vibration isolator according to a sixth aspect of the present invention is the vibration isolator according to any one of the second to fifth aspects, wherein a space is provided around the inner peripheral portion of the elastic member, and the shaft of the inner peripheral portion is provided. It is characterized by improved swingability.
A vibration isolator according to a seventh aspect of the present invention is the vibration isolator according to any one of the first to sixth aspects, wherein a cover that covers the sliding portions of the pair of friction members is provided. .
The vibration isolator according to an eighth aspect of the present invention is the vibration isolator according to the seventh aspect, wherein the cover is formed integrally with the elastic member.
The vibration isolator according to the invention of claim 9 is the vibration isolator according to claim 7 or 8, wherein the cover is provided with a communication port.
A vibration isolator according to claim 10 is the vibration isolator according to claim 9, wherein at least two communication ports are provided, and only one of the communication ports is allowed to flow from the inside to the outside of the cover. A check valve is provided, and the other communication port is provided with a check valve that allows only flow from the outside to the inside of the cover.
An anti-vibration device according to an invention of claim 11 is the anti-vibration device according to claim 9 or 10, wherein at least two communication ports are provided, and the two communication ports are attached with the anti-vibration device attached to the cover. It is provided above the lower end side and the communication port on the lower end side.
A vibration isolator according to a twelfth aspect of the present invention is the vibration isolator according to any one of the second to eleventh aspects, wherein the rod member includes a bolt for fixing the rod-shaped member to the second member. A through-hole extending in the axial direction into which is inserted is provided.
A vibration isolator according to a thirteenth aspect of the present invention is an anti-vibration device interposed between a first member and a second member to be damped, and is fitted in a mounting hole provided in the first member. A cylindrical elastic member attached together, a rod member having one end fixed to the second member side and the other end inserted slidably into the elastic member with friction, and one end side of the rod member One end side flange member fixed to the outer periphery of the rod member, one end abutting on the elastic member and the other end abutting on the one end side flange member, and a spring acting in a direction to separate the two members A vibration isolator comprising a through hole for inserting a bolt provided in the rod-like member.
A vibration isolator according to a fourteenth aspect of the present invention is the vibration isolator according to any one of the first to thirteenth aspects, wherein the first member is a mounting bracket for an in-vehicle fluid pump, and the second member is a body of an automobile. It is characterized by being.

According to the vibration isolator of the first aspect of the invention, the first and second members can be elastically supported by the supporting means to absorb vibrations, and the friction generated by the sliding of the pair of friction members. Vibration can be damped by force. Furthermore, the elastic member can exhibit an anti-vibration effect against vibrations other than the axial direction.
According to the vibration isolator of the invention of claim 2, the elastic member becomes a friction member, and the effect of claim 1 can be obtained with a simple structure at low cost.
According to the vibration isolator of the third aspect of the invention, the frictional force can be set by the shape of the protrusion, and even if a force in the swinging direction is applied, there is a clearance between the protrusions. Can be prevented from becoming too high.
According to the vibration isolator of the fourth aspect of the present invention, it is possible to set the frictional force depending on the shape of the protrusion, and it is also possible to set the frictional force according to the moving direction in the axial direction.
According to the vibration isolator of the fifth aspect of the present invention, excessive vibration is prevented by the elastic member coming into contact with the second member side with respect to a large amplitude, and after contact, vibration is caused by the elasticity of the elastic member. Can be suppressed.
According to the vibration isolator of the sixth aspect of the present invention, even if a force in the swing direction is applied to the periphery of the inner peripheral portion by the gap, the swing can be effectively absorbed.

According to the vibration isolator of the seventh aspect of the invention, it is possible to prevent foreign matter from entering the sliding portion of the friction member by the cover, and it is possible to prevent fluctuation of sliding friction due to the foreign matter. Further, it is possible to improve the durability by preventing the sliding portion from being deteriorated by the foreign matter.
According to the vibration isolator of the invention of claim 8, the number of parts can be reduced by integrating the cover with the elastic member.
According to the vibration isolator which concerns on invention of Claim 9, the water | moisture content which penetrate | invaded into the inside of a cover can be discharged | emitted.
According to the vibration isolator of the invention of claim 10, moisture that has entered the cover from the communication port on the lower end side of the cover can be discharged, air can be sucked from the communication port above the cover, Can be prevented immediately.
According to the vibration isolator of the invention of claim 11, the inside of the cover can be ventilated by circulating air between the inside and the outside of the cover.
According to the vibration isolator of the invention of claim 12, since the function as the friction member on the second component side and the function for attachment can be configured with one bar member, the number of parts can be reduced and the size can be reduced. Is possible.
According to the vibration isolator of the invention of claim 13, the first and second members can be elastically supported by the spring to absorb the vibration, and the frictional force generated by the sliding of the pair of friction members The vibration can be damped. Further, the elastic member can exhibit an anti-vibration effect against vibrations other than the axial direction of the spring.
According to the vibration isolator of the fourteenth aspect, it is possible to prevent vibration from being transmitted to the body of the automobile.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
An automobile air suspension apparatus to which the vibration isolator according to the present embodiment is applied will be described with reference to FIG. As shown in FIG. 3, the air suspension device 1 includes a spring suspension, an unsprung portion, that is, an air suspension 2 interposed between a suspension member supporting a wheel and a vehicle body, and compressed air to the air suspension 2. And a compressor unit 3 (first member) for supplying and discharging.

  The air suspension 2 is obtained by integrating an air spring 4 and a shock absorber 5. The air spring 4 is a suspension spring that supports the vehicle body by its spring force, and the vehicle height can be adjusted by supplying and discharging compressed air by the compressor unit 3. The shock absorber 5 attenuates vibration between the sprung and unsprung parts.

The compressor unit 3 controls the compressor 6, a motor 7 that drives the compressor 6, an air dryer 16 that is connected to a discharge port of the compressor 6 and adsorbs moisture of the compressed air, and supply / discharge of the compressed air from the air spring 4. A supply / discharge control valve 8 is provided, and these are integrally connected. Three brackets 9 are attached to the compressor unit 3, and the bracket 9 is coupled to a vehicle body side panel member 12 (second member) via a vibration isolator 11 by a bolt 10.
In addition, the coupling | bonding by the volt | bolt 10 may provide a female screw in the panel member 12, and may be screwed together, and may be couple | bonded using a nut.

  A suction port of the compressor 6 is connected to an intake filter 14 attached to the panel member 12 by a flexible intake tube 13. A lead wire 15 for power feeding is connected to the motor 7, and the lead wire 15 is clamped to the panel member 12 by a clamp 18A. The air dryer 16 is connected to the air spring 4 of the air suspension 2 by a flexible air line 17, and the air line 17 is clamped to the panel member 12 by a clamp 18B.

Next, the vibration isolator 11 will be described mainly with reference to FIGS. As shown in FIGS. 1 and 2, the vibration isolator 11 includes an upper bush 20 (elastic member) that fits into the mounting hole 19 of the bracket 9, and a lower bush 22 that abuts against the panel member 12 via a washer 21. The coil spring 23 interposed between the upper bush 20 and the lower bush 22 and the upper bush 20 and the lower bush 22 are inserted into the washer 21 (one end side flange member) and brought into contact with the panel member 12 by the bolt 10. And a pipe member 24 (second member side friction member, bar member) fixed to the head.
The inside of the pipe member 24 forms a through hole of the present invention, and the bolt 10 is inserted into the through hole. At that time, it is desirable to provide the washer 36 having a large diameter described in the second embodiment to be described later on the head side of the bolt, and the movement range of the upper bush 20 can be regulated by this washer.
The pipe member 24 may be fixed to the washer 21 by welding or the like.

  The upper bush 20 is an annular member made of a soft elastic body such as rubber or synthetic resin, and an outer peripheral groove 25 that fits into the mounting hole 19 of the bracket 9 is formed on the outer peripheral portion. The upper end side of the upper bush 20 is formed in a taper shape, and an annular groove 26 (gap) is formed on the upper end surface thereof, and the bottom portion of the annular groove 26 extends to the vicinity of the bottom portion of the outer peripheral groove 25. The lower end side of the outer peripheral groove 25 of the upper bush 20 has a larger diameter than the tapered upper end side, and a cylindrical convex portion 27 projects from the lower end surface. An annular spring receiving groove 28 into which the upper end portion of the coil spring 23 (support means) is fitted is formed on the outer peripheral portion of the convex portion 27 (regulating portion).

  A plurality of protrusions 30 (first member side friction members) extending along the axial direction are formed on the inner peripheral surface of the opening 29 of the upper bush 20. The protrusion 30 is pressed against the pipe member 24 inserted through the opening 29 and applies a frictional force to the sliding of the pipe member 24. The projecting portions 30 are provided at three or more locations on the inner peripheral surface of the opening 29, and preferably the pipe members 24 can be stably supported by providing the odd-numbered locations at equal intervals. It is provided in five places.

  The lower bush 22 is an annular member made of a soft elastic body such as rubber or synthetic resin, like the upper bush 20, and a cylindrical convex portion 31 facing the convex portion 27 of the upper bush 20 protrudes from the upper end surface. ing. An annular spring receiving groove 32 into which the lower end portion of the coil spring 23 is fitted is formed on the outer peripheral portion of the convex portion 31.

  Then, the upper bush 20 is fitted into the opening 19 of the bracket 10, and the lower bush 22 is brought into contact with the panel member 12 via the washer 21. The upper end portion of the coil spring 23 is fitted into the spring receiving groove 28 of the upper bush 20, the lower end portion is fitted into the spring receiving groove 32 of the lower bush 22, and the pipe member 24 is inserted into the upper bush 20 and the lower bush 22. The one end is brought into contact with the washer 21. In this state, the compressor unit 3 is attached to the panel member 12 by inserting the bolt 10 through the pipe member 24 and screwing it onto the panel member 12. At this time, a gap is normally formed between the convex portion 27 of the upper bush 20 and the convex portion 31 of the lower bush 22, and the pipe member 24 projects from the upper end surface of the upper bush 20 and By forming a gap between the upper end surface of the upper bush 20, the upper bush 20 can move between the lower bush 22 and the head of the bolt 10, and is elastically supported by the coil spring 23. Is done.

The operation of the present embodiment configured as described above will be described next.
The vehicle height can be raised by setting the supply / discharge control valve 8 to the supply position, operating the compressor 6 by the motor 7 and supplying compressed air to the air spring 4 of the air suspension 2 via the air dryer 7 and the air line 17. The vehicle height can be maintained by stopping the motor 7 and closing the supply / exhaust control valve 8 to seal the air spring 4, and switching the supply / exhaust control valve 8 to the exhaust position from the air spring 4. The vehicle height can be lowered by discharging the compressed air.

  The vibration isolator 11 normally elastically supports the compressor unit 3 by a coil spring 23, and transmits vibration from the compressor unit 3 to the panel member 12 by the elasticity of the coil spring 23 and the upper bush 20 and the lower bush 22. Suppress. At this time, the vibration can be attenuated by the frictional force generated by sliding between the protrusion 30 of the upper bush 20 and the pipe member 24. In this way, vibration suppression and damping are performed by the elasticity of the coil spring 23 and the friction between the protrusion 30 and the pipe member 24, thereby maintaining the durability of the upper bush 20 and the lower bush 22, while maintaining vibration resistance. Therefore, it is possible to achieve both vibration isolation performance and durability. Moreover, since the vibration of the compressor unit 3 can be damped, deterioration due to vibration of the intake tube 13, the lead wire 15 and the air line 17 can be reduced, and their durability can be enhanced.

  Further, a rotational force is generated such as when the motor 7 is started, and the bracket 9 swings. When the bracket 9 swings, the swinging can be absorbed by elastic deformation of the upper bush 20. In particular, in the present embodiment, since the annular groove 26 is provided, the swingability is enhanced. In addition, a squeezing force is generated in the upper bush 20 and the pipe member 24 during this swinging, but since the pipe member 24 is in contact with the projecting portion 30, there are reliefs on both sides of the projecting portion 30, so that the frictional force Can be prevented from becoming too large.

  When the amplitude of the compressor unit 1 becomes excessively large due to starting, stopping, load fluctuation, etc. of the motor 7 and the compressor 6, the convex portion 27 of the upper bush 20 and the convex portion of the lower bush 22 which are elastic bodies By colliding with each other, vibrations can be suppressed by the elasticity of the upper bush 20 while absorbing an impact.

  Since the number of protrusions 30, the shape, the diameter of the pipe member 24, and the like can be changed, the friction force (damping force) between the protrusions 30 and the pipe member 24 can be adjusted. The characteristics can be easily adjusted as necessary.

In the above embodiment, the example in which the first member of the present invention is the compressor unit 3 and the second member is the panel member 12 is shown. However, the present invention is not limited to this, and by attaching the vibration isolator 11 in reverse, The compressor unit 3 may be the second member, and the panel member 12 may be the first member.
Further, in the present embodiment, an example in which the lower bush 22 is an elastic body is shown, but a rigid body may be used.

  Next, a second embodiment of the present invention will be described with reference to FIGS. The first embodiment will be described in detail only with the same reference numerals assigned to the same parts and different parts.

  As shown in FIG. 4, in the vibration isolator 33 according to this embodiment, the upper portion of the outer bush 25 extends upward in a cylindrical shape to cover the tapered portion of the upper bush 20. A thin upper cover 34 (cover) is integrally formed. An inner peripheral groove 35 is formed at the upper end portion of the upper cover 34, and the inner peripheral groove 35 is fitted to the outer peripheral portion of a washer 36 attached to the upper end portion of the pipe member 24 by the bolt 10. Is coupled to the washer 36. The upper cover 34 is curved so as to bulge outward in the radial direction and has flexibility, so that the upper bush 20 can slide along the pipe member 24. In the lower part of the upper cover 34, holes 37 are provided at several locations for draining when water enters the inside.

  In addition, a thin lower cover 38 (cover) is integrally formed on the upper bush 20 so that the lower portion of the outer peripheral groove 25 extends downward in a cylindrical shape and covers the pipe member 24 and the lower bush 22. A lower end portion of the lower cover 38 is fitted to an outer peripheral portion of a washer 21 formed integrally with a lower end portion of the pipe member 24, and the lower cover 38 is coupled to the washer 21. The lower cover 38 is curved so as to bulge outward in the radial direction and has flexibility, so that the upper bush 20 can slide along the pipe member 24. In the lower end portion of the lower cover 38, drainage ports 39 (communication ports) are provided at several locations for draining water when it enters the interior.

  In the vibration isolator 33 of the present embodiment, the washer 21 is integrally formed at the lower end portion of the pipe member 24, and the lower bush 22 is attached to the pipe member 24 and the washer 21.

  With this configuration, the upper cover 34 and the lower cover 38 cover the sliding portion between the upper bush 20 and the pipe member 24 and prevent foreign matter from entering the sliding portion. Variations in sliding friction can be prevented. Further, it is possible to improve the durability by preventing the sliding portion from being deteriorated by the foreign matter.

  Next, a modification of the present embodiment will be described with reference to FIGS. In addition, with respect to what is shown in FIG. 4, the same reference numerals are given to the same parts, and only different parts will be described in detail.

In the modification shown in FIG. 5, a recess 40 is formed in the outer peripheral edge of the lower surface of the washer 21 at the lower end of the pipe member 24, and the tip of the lower cover 38 is fitted into the recess 40 so that the washer 21 and the panel member 12 are fitted. Is sandwiched between. Thereby, the lower cover 38 can be reliably connected to the washer 21, and the sealing performance can be improved.
In addition, a vent 39A (communication port) is provided at the upper part of the drain port 39, and the vent 39A can breathe. It should be noted that the total passage area of the vent 39A is set larger than the total area of the drain 39 so as not to suck water from the drain 39 as much as possible.

  In the modification shown in FIG. 6, in addition to the structure of the modification shown in FIG. 5, vent holes 41 (communication openings) are further provided at several locations on the lower cover 38. The drain port 39 and the vent port 41 are provided with check valves 42 and 43, respectively. The check valve 42 of the drain port 39 is integrally formed with a lip portion that contacts the outside of the wall portion of the lower cover 38 and opens and closes the drain port 39, and allows only flow from the inside of the lower cover 38 to the outside. To do. Further, the check valve 43 of the vent 41 is formed integrally with a lip portion that contacts the inside of the wall portion of the lower cover 38 and opens and closes the vent 41, and only flows from the outside to the inside of the lower cover 38. Is acceptable.

  As a result, when the upper bush 20 moves along the pipe member 24, the volume inside the lower cover 38 changes, so that air is sucked from the vent 41 and discharged from the drain 39. By circulating air between the inside and the outside, the inside of the lower cover 38 can be ventilated, and condensation and the like can be prevented. Similarly, the upper cover 34 may be provided with a vent and a check valve.

  In the modification shown in FIG. 7, the lower end outer peripheral portion of the convex portion 27 disposed on the inner peripheral side of the coil spring 23 of the upper bush 20 is extended downward, and a thin lower cover 44 is integrated so as to cover the pipe member 24. Is formed. A lower end portion of the lower cover 44 is fitted into an annular groove 45 formed between the inner peripheral edge portion of the upper end of the lower bush 22 and the outer peripheral portion of the pipe member 24 and is coupled to the lower bush 22. The lower cover 44 is formed in a tapered shape and has flexibility, so that the upper bush 20 can slide along the pipe member 24. At the lower end of the lower cover 44, drainage ports (not shown) are provided at several locations for draining when water enters inside. Moreover, you may provide a vent hole and a non-return valve in the lower cover 44 similarly to the modification shown in FIG. Thereby, there can exist an effect | action similar to the modification shown in FIG. 4 thru | or FIG.

  Next, in the modification shown in FIG. 8, instead of the plurality of protrusions 30 (first member side friction members) extending along the axial direction formed in the opening 29 of the upper bush 20 of the first embodiment, In this example, two protrusions 51 in the circumferential direction are used. The protrusion 51 provided on the upper bush 50 has a lip shape with the tip extending upward in the drawing. By changing the lip shape in this way, it is possible to change the frictional force when the first member and the second member are approaching and separating. In addition, although the said circumferential protrusion 51 is circular, by forming it in a spiral, the effects of both the first embodiment and the modified example can be enjoyed, and the upper bush is pulled out from the mold at the time of creation. It is also easy.

  In each of the above embodiments, the inner peripheral surface of the upper bush is used as a friction member, but another member may be baked on the inner peripheral surface to form the friction member. Moreover, the inner peripheral surface of the upper bush may be a flat surface, and the outer periphery of the pipe member 24 as a rod member may be uneven.

  Moreover, in each said embodiment, although the example using the coil spring 23 was shown as a support member of this invention, it has not only this but a spring property, such as a cylindrical elastomer, a disc spring, and an air spring. Anything is acceptable. However, the coil spring is the most desirable form because of its soft spring force and durability.

  In the above embodiment, the example in which the vibration isolator of the present invention is used in a compressor unit for an air suspension is described. However, the present invention is not limited to this, and a pump unit or a brake that supplies hydraulic pressure to a brake mounted on an automobile. You may use for the apparatus which has a vehicle-mounted fluid pump, such as a vacuum pump unit which supplies negative pressure to a power booster, and a hydraulic pump unit which supplies hydraulic pressure to power steering.

It is a longitudinal cross-sectional view which shows the vibration isolator which concerns on 1st Embodiment of this invention. It is a top view of the vibration isolator shown in FIG. It is a side view which shows the structure of the air suspension apparatus of the motor vehicle which applied the vibration isolator shown in FIG. It is a longitudinal cross-sectional view which shows the vibration isolator which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the modification of the vibration isolator shown in FIG. It is a longitudinal cross-sectional view which shows the other modification of the vibration isolator shown in FIG. It is a longitudinal cross-sectional view which shows another modification of the vibration isolator shown in FIG. It is a longitudinal cross-sectional view which shows the modification of the upper bush of 1st Embodiment shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Vibration isolator, 3 Compressor unit (1st member), 12 Panel member (2nd member), 20 Upper bush (elastic member), 22 Lower bush (elastic member), 23 Coil spring, 24 Pipe member (friction member, Bar member), 25 convex portion, 30 protruding portion (friction member), 31 convex portion

Claims (14)

An anti-vibration device interposed between a first member to be damped and a second member, an elastic member attached to the first member, and the first member and the second through the elastic member A prevention means comprising: a supporting means for supporting the member with a spring property; and a pair of friction members attached to each of the first and second members and sliding with each other by vibration. Shaker. The elastic member has an annular shape, the friction member on the first member side is configured by the inner peripheral portion of the elastic member, and the friction member of the second member is slidably inserted into the inner peripheral portion of the elastic member. The anti-vibration device according to claim 1, further comprising a bar member attached to the second member. The vibration isolator according to claim 2, wherein a plurality of axially extending protrusions that contact the rod member are formed on an inner periphery of the elastic member. The vibration isolator according to claim 2, wherein a projecting portion extending in a circumferential direction contacting the rod member is formed on an inner periphery of the elastic member. The elastic member is provided with a restricting portion that abuts against the second member side and restricts relative movement between the first member and the second member. The vibration isolator described in 1. The vibration isolator according to any one of claims 2 to 5, wherein a gap is provided around the inner peripheral portion of the elastic member to improve the swingability of the shaft of the inner peripheral portion. The vibration isolator according to any one of claims 1 to 6, further comprising a cover that covers a sliding portion of the pair of friction members. The vibration isolator according to claim 7, wherein the cover is formed integrally with the elastic member. The vibration isolator according to claim 7 or 8, wherein a communication port is provided in the cover. At least two communication ports are provided, one of the communication ports is provided with a check valve that allows only the flow from the inside of the cover to the outside, and the other communication port is provided with a flow from the outside to the inside of the cover. The anti-vibration device according to claim 9, further comprising a check valve that allows only the non-return valve. The at least two communication ports are provided, and the two communication ports are provided on the lower end side of the cover and above the communication port on the lower end side with a vibration isolator attached. 10. The vibration isolator according to 10. The through-hole extending in the axial direction in which the bolt for fixing this rod-shaped member to the said 2nd member is inserted is provided in the said rod member, The Claim 1 thru | or 11 characterized by the above-mentioned. Anti-vibration device. A vibration isolator interposed between the first member and the second member to be damped, and a cylindrical elastic member fitted and attached to an attachment hole provided in the first member; A rod member having one end fixed to the second member side and the other end slidably inserted into the elastic member with friction; and provided on the other end side of the rod member; A fixed one end side flange member, a spring that is provided on one end of the outer periphery of the bar member in contact with the elastic member, the other end in contact with the one end side flange member, and acting in a direction to separate the two members; A vibration isolator comprising a through hole for inserting a bolt provided in the rod-like member. The vibration isolator according to any one of claims 1 to 13, wherein the first member is a mounting bracket of an in-vehicle fluid pump, and the second member is an automobile body.

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