JP5277101B2 - Vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely position an elastic body and a second mounting member at a predetermined position in the direction of opening inside the accommodation cavity of a first mounting member. <P>SOLUTION: A rebound stopper 18 contacts the inner surface of the accommodation cavity 11. On the tip ends 17a and press-fit grooves 16 of feet 17 and the rebound stopper 18 and the accommodation cavity 11, engaging parts 20, 21, 22, 23 are separately formed that restrict the relative movement of the first mounting member 12 and the elastic body 14 in the direction of opening of the accommodation cavity 11. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vibration isolator.

Conventionally, for example, as shown in Patent Document 1 below, the first mounting member is connected to one of the vibration generating portion and the vibration receiving portion and has a receiving hole, and the other is connected to the other. A cylindrical second mounting member disposed in the housing hole; and an elastic body having an inner peripheral side portion joined to the second mounting member, and the second mounting member on the outer peripheral side portion of the elastic body. A state in which a gap is formed between the leg portion projecting from the side toward the inner surface side of the accommodation hole and the tip portion thereof being press-fitted into a press-fitting groove formed on the inner surface of the accommodation hole, and the inner surface of the accommodation hole There is known a vibration isolator provided with a rebound stopper portion that receives a rebound load that is disposed on and acts on the vibration isolator.
By the way, in recent years, in order to suppress relative displacement of the first mounting member and the second mounting member, there has been proposed a vibration isolator in which the rebound stopper portion of the elastic body is brought into contact with the inner surface of the accommodation hole.
The vibration isolator is configured to slidably contact the tip of the leg with the inner surface of the press-fitting groove while compressively deforming at least the tip of the elastic body, and slidably contact the rebound stopper with the inner surface of the receiving hole. The elastic body is pushed into the accommodation hole together with the second attachment member.

JP 2003-74630 A

However, in the conventional vibration isolator, it is difficult to position the elastic body and the second attachment member at a predetermined position along the opening direction in the accommodation hole of the first attachment member during the production thereof. There was a problem.
In addition, if the positions of the elastic body and the second attachment member in the opening direction in the accommodation hole are deviated, it may take time to assemble the vibration isolator to the vibration generating portion and the vibration receiving portion. is there.

  The present invention has been made in consideration of such circumstances, and the elastic body and the second mounting member are reliably positioned at predetermined positions along the opening direction in the accommodation hole of the first mounting member. An object of the present invention is to provide an anti-vibration device capable of performing the above.

  In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention is connected to either one of the vibration generating portion and the vibration receiving portion and has a receiving hole formed therein. 1 attachment member, and a cylindrical second attachment member connected to the other and disposed in the accommodation hole, and an elastic body having an inner peripheral portion joined to the second attachment member, A leg portion projecting from the second mounting member side toward the inner surface side of the accommodation hole on the outer peripheral side portion of the elastic body, and a tip portion of which is press-fitted into a press-fitting groove formed on the inner surface of the accommodation hole; A rebound stopper that receives a rebound load that acts on the vibration isolator, the rebound stopper being in contact with the inner surface of the receiving hole, and the tip of the leg and the press-fitting groove , And rebound stopper and Each of the receiving holes is formed with an engaging portion for restricting movement of the first mounting member and the elastic body along the opening direction of the relative receiving holes by engaging with each other. And

According to this invention, when manufacturing the vibration isolator, the elastic body is pushed into the accommodation hole together with the second attachment member, and the elastic body and the second attachment member are moved to a predetermined position along the opening direction in the accommodation hole. When reaching, the engaging portions formed in the tip portion of the leg portion and the press-fitting groove engage with each other, and the engaging portions formed in the rebound stopper portion and the receiving hole engage with each other. As a result, the elastic body and the second attachment member can be reliably positioned at a predetermined position along the opening direction in the accommodation hole.
Further, since the movement of the first attachment member and the elastic body along the relative opening direction is restricted by the engagement of the engaging portions described above, the vibration isolator is used as the vibration generating portion. Further, it is possible to suppress the displacement of the elastic body and the second mounting member in the opening direction with respect to the first mounting member due to the external force applied to the vibration isolator when the vibration receiving unit is assembled. .

  Here, the engaging portions respectively formed in the receiving hole and the press-fitting groove are disposed at the same position along the opening direction, and the receiving hole and the press-fitting groove are respectively in the opening direction. The diameter may be gradually increased from the position where the engagement portion is formed along the opening direction.

In this case, since the accommodating hole and the press-fitting groove gradually increase in diameter as they move away from the formation position of the engaging portion along the opening direction along the opening direction, the elastic body is placed in the accommodating hole together with the second mounting member. It is possible to gradually increase the amount of compressive deformation of the elastic body during the process of pushing into the elastic body. Accordingly, the elastic body and the second mounting member can be pushed into the housing hole with little resistance, and the elastic body and the second mounting member can be easily and reliably placed at predetermined positions along the opening direction in the housing hole. Can be positioned.
In addition, you may form the said engaging part in the center part of the said opening direction in each of the said accommodation hole and a press-fit groove | channel.

  Further, a plurality of the leg portions are disposed on the one side half of the outer peripheral side portion of the elastic body at intervals in the circumferential direction, and the rebound stopper portion is an outer peripheral side portion of the elastic body, You may arrange | position in the other side half.

  In this case, of the outer peripheral side portion of the elastic body, the leg portion is disposed on one half and the rebound stopper portion is disposed on the other half, so that the damping performance is effectively applied to the vibration isolator. It can be demonstrated.

  According to this invention, the elastic body and the second mounting member can be reliably positioned at a predetermined position along the opening direction in the accommodation hole of the first mounting member.

It is a principal part longitudinal cross-sectional view of the vibration isolator shown as one Embodiment which concerns on this invention. It is AA arrow sectional drawing of the vibration isolator shown in FIG. FIG. 3 is a cross-sectional view of the vibration isolator shown in FIG.

Hereinafter, an embodiment of a vibration isolator 1 according to the present invention will be described with reference to FIGS. 1 to 3.
The vibration isolator 1 is connected to one of the vibration generating portion and the vibration receiving portion and is connected to the first mounting member 12 in which the receiving hole 11 is formed, and is connected to the other and in the receiving hole 11. A cylindrical second mounting member 13 disposed and an elastic body 14 having an inner peripheral side portion joined to the second mounting member 13 are provided.
In the present embodiment, the vibration isolator 1 is used as an example in which the first mounting member 12 is connected to the vehicle body as the vibration receiving portion and the second mounting member 13 is connected to the engine as the vibration generating portion. explain.

  In FIG. 1, the lower side is the direction in which a static load is naturally input to the vibration isolator 1 in a state assembled to the vibration generating unit and the vibration receiving unit, that is, the bounce side, and the upper side is the rebound side. In addition, the direction perpendicular to the paper surface, that is, the direction along the opening direction of the accommodation hole 11 is the vehicle left-right direction X. The orthogonal direction is the vehicle longitudinal direction Z.

The second attachment member 13 is formed in a cylindrical shape, for example, of a metal material or a synthetic resin material, and extends along the vehicle left-right direction X.
The elastic body 14 is formed of a rubber material, and an inner peripheral side portion thereof is vulcanized and bonded to the outer peripheral surface of the second mounting member 13. The elastic body 14 protrudes from the second attachment member 13 side toward the inner surface side of the accommodation hole 11 on the outer peripheral side portion of the elastic body 14, and the distal end portion 17 a is press-fitted into a press-fit groove 16 formed on the inner surface of the accommodation hole 11. Leg portion 17 and a rebound stopper portion 18 that receives a rebound load that acts on the vibration isolator 1 are provided.

A plurality of the leg portions 17 are arranged in the lower half of the outer peripheral side portion of the elastic body 14 at intervals in the circumferential direction, in the illustrated example, in the vehicle longitudinal direction Z. Further, two leg portions 17 are disposed, and gradually extend toward the outside in the vehicle longitudinal direction Z from the upper side on the second mounting member 13 side toward the lower side on the inner surface side of the accommodation hole 11. Yes.
Here, in the longitudinal sectional view along the direction orthogonal to the vehicle left-right direction X as shown in FIG. 1, the tip 17 a of the leg 17 protrudes from the other part 17 b of the leg 17. It overhangs in a direction that intersects the direction. Further, the shape of the distal end portion 17a of the leg portion 17 in the longitudinal sectional view is a substantially square shape. The front end portion 17a of the leg portion 17 is an upper surface extending from the outer portion of the other portion 17b in the vehicle front-rear direction Z toward the outer side of the vehicle front-rear direction Z, and facing the upper side. An outer surface extending from the end toward the lower side and facing outward in the vehicle longitudinal direction Z, and extending from the inner portion of the vehicle longitudinal direction Z in the other portion 17b toward the lower side and extending inward of the vehicle longitudinal direction Z An inner surface facing the vehicle, a lower surface extending from the lower end of the inner surface toward the outside in the vehicle longitudinal direction Z and facing the lower side, and a corner surface formed by chamfering a corner formed by the inner surface and the outer surface. .

  The rebound stopper portion 18 is disposed in the upper half of the outer peripheral side portion of the elastic body 14 and is in contact with the inner surface of the accommodation hole 11. In the present embodiment, the rebound stopper portion 18 is disposed in the center portion in the vehicle longitudinal direction Z in the upper half of the outer peripheral side portion of the elastic body 14. The rebound stopper portion 18 is formed in a trapezoidal shape that gradually decreases in size in the vehicle front-rear direction Z from the lower side of the second attachment member 13 toward the upper side of the inner surface side of the accommodation hole 11. Furthermore, in this embodiment, the rebound stopper portion 18 is in close contact with the inner surface of the accommodation hole 11 in a state of being compressed and deformed in the vertical direction Y.

In the illustrated example, side stoppers 19 project from the both sides in the vehicle longitudinal direction Z in the upper half of the outer peripheral side portion of the elastic body 14 toward the outside in the vehicle longitudinal direction Z.
Here, the accommodation hole 11 penetrates the first attachment member 12 in the vehicle left-right direction X, and the first attachment member 12 is a cylindrical body formed of, for example, a metal material or a synthetic resin material. Further, a fixing portion 29 that is fixed to a vehicle body (not shown) is provided on the outer peripheral portion of the first mounting member 12.

  The press-fitting grooves 16 are respectively recessed at both ends in the vehicle front-rear direction Z in the lower portion facing the upper side of the inner surface of the accommodation hole 11 of the first mounting member 12. The press-fit groove 16 extends in the left-right direction X of the vehicle and penetrates the first mounting member 12 in the left-right direction X of the vehicle in the same manner as the accommodation hole 11. In the longitudinal sectional view, the shape of the press-fit groove 16 is the same as that of the tip portion 17a of the leg portion 17, and the size of the press-fit groove 16 is smaller than the size of the tip portion 17a of the leg portion 17 before being press-fitted. ing. And the outer peripheral surface of the front-end | tip part 17a of the leg part 17 is press-contacting to the inner surface of the press-fit groove 16 over the whole region. The intermediate portion located between the press-fit grooves 16 in the lower portion of the inner surface of the accommodation hole 11 is between the connecting portions with the leg portion 17 in the lower half of the inner peripheral portion of the elastic body 14. It is opposed to the intermediate portion located between them with a gap in the vertical direction Y.

In the present embodiment, a first engagement groove (engagement portion) 20 is formed on the outer peripheral surface of the distal end portion 17 a of the leg portion 17, and the first engagement protrusion that engages with the first engagement groove 20. A portion (engagement portion) 21 is formed on the inner surface of the press-fit groove 16.
The first engagement groove 20 is a groove having a circular arc shape in cross section, and extends over the above-described inner surface, outer surface, lower surface, and square surface of the outer peripheral surface of the distal end portion 17a of the leg portion 17. Further, the first engagement groove 20 is formed at the center portion in the vehicle left-right direction X of the distal end portion 17 a of the leg portion 17. Note that the first engagement groove 20 is not limited to a groove having a circular arc shape in cross section, but may be a groove having a rectangular shape or U shape in cross section, or other shapes.
The first engaging protrusion 21 is a protrusion having an arc shape in cross section, and extends on the inner surface of the press-fit groove 16 over substantially the entire circumference. Further, the first engagement protrusion 21 is formed at the center portion of the press-fit groove 16 in the vehicle left-right direction X. The first engagement protrusion 21 is not limited to a protrusion having an arc shape in cross section, and may be a protrusion having a rectangular shape, U shape, or other shape in cross section.

In the present embodiment, a second engagement groove (engagement portion) 22 is formed on the upper surface of the rebound stopper portion 18, and a second engagement protrusion (engagement) that engages with the second engagement groove 22. 23) is formed on the inner surface of the accommodation hole 11.
The second engagement groove 22 is a groove having an arc shape in cross section, and extends on the upper surface of the rebound stopper portion 18 over the entire length in the vehicle longitudinal direction Z. Further, the second engagement groove 22 is formed in the central portion of the rebound stopper portion 18 in the vehicle left-right direction X. Note that the second engagement groove 22 is not limited to a groove having an arc shape in cross section, and may be a groove having a rectangular shape, a U shape, or other shapes in cross section.
The second engaging protrusion 23 is a protrusion having a circular arc shape in cross section, and extends over the entire area in the vehicle front-rear direction Z on the upper portion of the inner surface of the accommodation hole 11 facing downward. Note that the upper portion of the inner surface of the accommodation hole 11 extends substantially in the horizontal direction in the illustrated example. Further, the second engagement protrusion 23 is formed at the central portion of the accommodation hole 11 in the vehicle left-right direction X. In addition, the 2nd engagement protrusion 23 is not restricted to the protrusion of circular arc shape in a cross section, but may be a protrusion in a rectangular shape, a U shape, or other shapes in cross section.

As described above, the first engagement protrusion 21 formed in the press-fit groove 16 is engaged with the first engagement groove 20 formed in the distal end portion 17 a of the leg portion 17 and formed in the rebound stopper portion 18. When the second engagement protrusion 23 formed in the accommodation hole 11 is engaged with the formed second engagement groove 22, the relative direction of the first mounting member 12 and the elastic body 14 in the left-right direction X of the vehicle is met. Movement in both directions is restricted.
The first engagement protrusion 21 formed in the press-fit groove 16 and the second engagement protrusion 23 formed in the accommodation hole 11 are at the same position along the vehicle left-right direction X in the first mounting member 12. The first engagement groove 20 formed in the distal end portion 17a of the leg portion 17 and the second engagement groove 22 formed in the rebound stopper portion 18 are arranged in the vehicle lateral direction X in the elastic body 14. It is arranged at the same position along.

  Further, in the present embodiment, the receiving hole 11 gradually increases in diameter as the distance from the formation position of the second engagement protrusion 23 along the vehicle left-right direction X to both sides in the vehicle left-right direction X increases. Further, the press-fitting groove 16 gradually increases in diameter as it moves away from the formation position of the first engagement protrusion 21 along the vehicle left-right direction X to both sides in the vehicle left-right direction X. The first mounting member 12 may be formed by casting or the like when formed of a metal material, and may be formed by injection molding or the like when formed of a synthetic resin material.

The inclination angle of the inner surface of the accommodation hole 11 and the inner surface of the press-fitting groove 16 with respect to the horizontal direction is, for example, 1 ° to 5 °, preferably about 3 °.
In addition, when the elastic body 14 whose inner peripheral side portion is vulcanized and bonded to the outer peripheral surface of the second mounting member 13 is assembled to the first mounting member 12, the upper side of the inner surfaces of the rebound stopper portion 18 and the accommodation hole 11 in advance. Lubricant is applied to at least one of the portions, and at least one of the distal end portion 17a of the leg portion 17 and the inner surface of the press-fit groove 16, and then the rebound stopper portion 18 is connected to the upper portion of the inner surface of the accommodation hole 11. The tip 17a of the leg 17 is press-fitted into the press-fitting groove 16.

  In the above configuration, when vibration from the engine is transmitted to the second mounting member 13 via an engine bracket (not shown), the elastic body 14 is elastically deformed by the transmitted vibration. Thereby, the vibration is absorbed by the vibration absorbing action based on the internal friction or the like of the elastic body 14, and the vibration propagating from the first mounting member 12 to the vehicle body (not shown) is reduced.

  As described above, according to the vibration isolator 1 according to the present embodiment, the elastic body 14 and the second mounting member 13 are pushed into the accommodation hole 11 during the manufacture thereof, and the elastic body 14 and the second mounting member 13 are moved. A first engagement groove 16 formed in the press-fit groove 16 is formed in the first engagement groove 20 formed in the distal end portion 17a of the leg portion 17 when reaching a predetermined position along the vehicle left-right direction X in the accommodation hole 11. The engagement protrusion 21 is engaged, and the second engagement protrusion 23 formed in the accommodation hole 11 is engaged with the second engagement groove 22 formed in the rebound stopper 18, so that the elastic body 14 and the second attachment member 13 can be reliably positioned at predetermined positions along the vehicle left-right direction X in the accommodation hole 11.

  Further, the first engagement protrusions 21 are engaged with the first engagement grooves 20 and the second engagement protrusions 23 are engaged with the second engagement grooves 22. Since the relative movement of the body 14 along the left-right direction X of the vehicle is restricted, an external force applied to the vibration isolator 1 when the vibration isolator 1 is assembled to the vibration generator and the vibration receiver. Further, it is possible to suppress the displacement of the elastic body 14 and the second attachment member 13 in the vehicle left-right direction X with respect to the first attachment member 12.

  Further, the accommodating hole 11 gradually increases in diameter as it moves away from the formation position of the second engagement protrusion 23 along the vehicle left-right direction X to both sides of the vehicle left-right direction X, and the press-fit groove 16 extends in the vehicle left-right direction X In the process of pushing the elastic body 14 into the accommodation hole 11 together with the second attachment member 13, the diameter gradually increases as the distance from the formation position of the first engagement protrusion 21 along the left and right sides in the vehicle lateral direction X increases. The amount of compressive deformation of the elastic body 14 can be gradually increased. Therefore, the elastic body 14 can be pushed into the accommodation hole 11 together with the second mounting member 13 with little resistance, and the elastic body 14 and the second mounting member 13 are predetermined along the vehicle left-right direction X in the accommodation hole 11. It can be easily and reliably located at the position.

In addition, since the leg portion 17 is disposed in the lower half and the rebound stopper portion 18 is disposed in the upper half of the outer peripheral side portion of the elastic body 14, the damping performance is effective for the vibration isolator 1. Can be demonstrated.
Furthermore, since the rebound stopper portion 18 is in contact with the upper portion of the inner surface of the accommodation hole 11, the relative displacement amount of the first mounting member 12 and the second mounting member 13 in the vertical direction Y can be suppressed, and the rebounding can be performed. Since it is possible to generate a frictional force along the horizontal direction between the stopper portion 18 and the upper portion of the inner surface of the accommodation hole 11, the relative horizontal direction of the first mounting member 12 and the second mounting member 13. It is also possible to suppress the amount of displacement.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the embodiment, the first engagement protrusion 20 is engaged with the first engagement groove 20, and the second engagement protrusion 23 is engaged with the second engagement groove 22. Although the relative movement of the attachment member 12 and the elastic body 14 along the left-right direction X of the vehicle is restricted, instead of this, for example, protrusions are separately provided at both end portions of the accommodation hole 11 and the press-fit groove 16 in the left-right direction X of the vehicle. By forming and engaging these protrusions with both ends in the vehicle left-right direction X of the tip portion 17a of the leg portion 17 and the rebound stopper portion 18, respectively, the vehicle left and right relative to the first attachment member 12 and the elastic body 14 are relative to each other. Movement along the direction X may be restricted.

  Further, the first engagement groove 20 is formed in the distal end portion 17a of the leg portion 17 and the first engagement protrusion 21 is formed in the press-fit groove 16, but instead, the first engagement groove 20 is formed in the distal end portion 17a of the leg portion 17. One engagement protrusion may be formed, the first engagement groove may be formed in the press-fitting groove 16, and the second engagement groove 22 may be formed in the rebound stopper portion 18, and the second engagement groove 11 may be formed in the accommodation hole 11. Although the mating projection 23 is formed, instead of this, a second engagement projection may be formed in the rebound stopper portion 18 and a second engagement groove may be formed in the accommodation hole 11. In this configuration, the first attachment member 12 may be formed by, for example, pressing.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

  The elastic body and the second mounting member can be reliably positioned at a predetermined position along the opening direction in the accommodation hole of the first mounting member.

DESCRIPTION OF SYMBOLS 1 Anti-vibration apparatus 11 Accommodation hole 12 1st attachment member 13 2nd attachment member 14 Elastic body 16 Press-fit groove | channel 17 Leg part 17a The front-end | tip part of a leg part 18 Rebound stopper part 20 1st engagement groove (engagement part)
21 1st engagement protrusion (engagement part)
22 Second engagement groove (engagement portion)
23 2nd engagement protrusion (engagement part)
X Vehicle left-right direction (opening direction of receiving hole)
Y Vertical direction Z Vehicle longitudinal direction

Claims (3)

A first mounting member connected to one of the vibration generating portion and the vibration receiving portion and having a receiving hole formed therein, and a cylindrical second member connected to the other and disposed in the receiving hole. An attachment member;
An inner peripheral side portion comprising an elastic body joined to the second mounting member,
A leg portion projecting from the second mounting member side toward the inner surface side of the accommodation hole on the outer peripheral side portion of the elastic body, and a tip portion of which is press-fitted into a press-fitting groove formed on the inner surface of the accommodation hole; A rebound stopper that receives a rebound load acting on the vibration isolator, and a vibration isolator equipped with the anti-vibration device,
The rebound stopper portion contacts the inner surface of the accommodation hole,
The distal end portion of the leg portion and the press-fitting groove, and the rebound stopper portion and the accommodation hole are engaged with each other, thereby moving the first attachment member and the elastic body along the opening direction of the relative accommodation hole. An anti-vibration device characterized in that engaging portions to be regulated are formed separately. The vibration isolator according to claim 1,
The engaging portions respectively formed in the receiving hole and the press-fitting groove are disposed at the same position along the opening direction, and the receiving hole and the press-fitting groove are respectively the engaging portions along the opening direction. An anti-vibration device characterized in that the diameter gradually increases as the distance from the formation position increases along the opening direction. The vibration isolator according to claim 1 or 2,
A plurality of the leg portions are disposed on one half of the outer peripheral side portion of the elastic body at intervals in the circumferential direction, and the rebound stopper portion is the other side of the outer peripheral side portion of the elastic body. Anti-vibration device characterized by being arranged in half.

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