JP2013047547A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress loads applied to rubber elastic bodies from a stopper.SOLUTION: This vibration isolator 10 comprises: a bracket 11; an inner cylinder member 12 attached with the bracket 11; an outer cylinder member 13 which surrounds the inner cylinder member 12 from the outside of the radial direction of the inner cylinder member; a pair of the rubber elastic bodies 14 which protrude from the external peripheral face of the inner cylinder member 12 and reach the internal peripheral face of the outer cylinder member 13 at their tips; and the stopper 15 which regulates approximating moving amounts of the inner cylinder member 12 and the outer cylinder member 13 which sandwich the rubber elastic bodies 14. The stopper 15 comprises: a stopper protrusion 33 which protrudes from the inner cylinder member 12 toward the axial direction of the inner cylinder member in the bracket 11, and is protrusively formed at a portion apart from a pair of the rubber elastic bodies 14 in the axial direction toward a direction in which the rubber elastic bodies 14 are protruded from the side of the inner cylinder member 12 toward the side of the outer cylinder member 13; and stopper rubber 34 which is arranged in a portion opposing the tip of the stopper protrusion 33 at the internal peripheral face of the outer cylinder member 13.

Description

  The present invention relates to a vibration isolator that is provided between, for example, an automobile engine and a vehicle body and is suitable for supporting the engine in a vibration-proof manner.

Conventionally, an inner cylinder member connected to one of the vibration generating part and the vibration receiving part, and an outer cylinder connected to the other of the vibration generating part and the vibration receiving part and surrounding the inner cylindrical member from the outside in the radial direction A member, a pair of rubber elastic bodies projecting from the outer peripheral surface of the inner cylindrical member and having a tip end portion on the inner peripheral surface of the outer cylindrical member, and the approaching movement amount of the inner cylindrical member and the outer cylindrical member sandwiching the rubber elastic body are regulated. An anti-vibration device including a stopper is known.
In this type of vibration isolator, when vibration is input from the vibration generator, the rubber elastic body is elastically deformed so that this vibration can be attenuated and absorbed. When large amplitude vibration is input in the direction in which the outer cylinder members move closer to each other, the amount of approach movement is restricted by the stopper described above, thereby suppressing the rubber elastic body from being deformed excessively. Yes.
As such a stopper, for example, as shown in Patent Documents 1 and 2 below, a crotch portion between a pair of rubber elastic bodies on the outer peripheral side of the inner cylinder member, and an inner peripheral surface of the outer cylinder member A structure is known that includes a rubber protrusion that protrudes radially inward from a portion facing the crotch portion in the radial direction.

JP 2003-49901 A JP 2003-74634 A

  However, in the conventional vibration isolator, the rubber protrusion comes into contact with the pair of rubber elastic bodies, or the impact force generated when the rubber protrusion comes into contact with the crotch part is propagated to the rubber elastic body. For example, a large load may be applied to the rubber elastic body.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a vibration isolator capable of suppressing a load applied from a stopper to a rubber elastic body.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention is connected to one of the vibration generator and the vibration receiver, the inner cylinder member to which the bracket is attached, and the other of the vibration generator and the vibration receiver. An outer cylinder member that surrounds the inner cylinder member from the outside in the radial direction thereof, a pair of rubber elastic bodies that protrude from the outer peripheral surface of the inner cylinder member and whose tip ends on the inner peripheral surface of the outer cylinder member, And a stopper for restricting an approaching movement amount of the inner cylinder member and the outer cylinder member sandwiching the rubber elastic body, wherein the stopper is arranged in the bracket in the axial direction from the inner cylinder member. A stopper protrusion that protrudes from the pair of rubber elastic bodies in the axial direction so that the rubber elastic body protrudes from the inner cylinder member side toward the outer cylinder member side. And the inner peripheral surface of the outer cylinder member Chi, characterized in that it and a stopper rubber portion disposed in a portion facing the distal end of the stopper projection.

In the present invention, when the inner cylinder member and the outer cylinder member move closer together so as to sandwich the rubber elastic body, the approaching movement amount is regulated by the stopper projection of the stopper and the stopper rubber part coming into contact with each other.
As described above, since the stopper is provided, it is possible to regulate the approaching movement amount of the inner cylinder member and the outer cylinder member sandwiching the rubber elastic body without providing a rubber protrusion as in the conventional vibration isolator. it can. And since the stopper protrusion is protrudingly provided in the bracket at a portion away from the pair of rubber elastic bodies in the axial direction, the distance between the rubber elastic body and the stopper protrusion can be easily secured. For example, it is difficult to make the stopper protrusion and the pair of rubber elastic bodies contact each other, or it is difficult to propagate the impact force generated when the stopper protrusion and the stopper rubber section contact each other to the pair of rubber elastic bodies. And so on.
As described above, the load applied from the stopper to the rubber elastic body can be suppressed.

  Moreover, the inner peripheral surface of the outer cylinder member may be formed in a polygonal shape in a front view as viewed from the axial direction.

In this case, since the inner peripheral surface of the outer cylinder member is formed in a polygonal shape in the front view, the rubber elastic body is bonded among the plurality of flat wall surfaces that define the inner peripheral surface of the outer cylinder member. The flat wall surface and the flat wall surface to which the stopper rubber portion is bonded can be easily made different from each other with few restrictions on design.
Therefore, for example, without increasing the size of the outer cylinder member or the inner cylinder member, the adhesive strength between the rubber elastic body and the stopper rubber portion and the inner peripheral surface of the outer cylinder member, and the rubber elastic body and the stopper protrusion The distance between the two can be easily and reliably ensured.

  According to the vibration isolator which concerns on this invention, the load added to a rubber elastic body from a stopper can be suppressed.

It is a front view of the vibration isolator which concerns on one Embodiment of this invention. It is an AA cross-sectional arrow view shown in FIG. It is sectional drawing of the vibration isolator shown in FIG. It is a perspective view of the vibration isolator shown in FIG.

Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the vibration isolator 10 includes a bracket 11 connected to one of the vibration generating unit and the vibration receiving unit, an inner cylinder member 12 to which the bracket 11 is attached, a vibration generating unit, and The outer cylinder member 13 is connected to the other of the vibration receiving parts and surrounds the inner cylinder member 12 from the outer side in the radial direction, and the front end part protrudes from the outer circumferential surface of the inner cylinder member 12 and the inner circumferential surface of the outer cylinder member 13 A pair of rubber elastic bodies 14 extending upward, and a stopper 15 for regulating the approaching movement amount of the inner cylinder member 12 and the outer cylinder member 13 sandwiching the rubber elastic body 14 are provided.

  The axis O1 of the inner cylinder member 12 and the axis (not shown) of the outer cylinder member 13 are parallel to each other and shifted so as to be non-coaxial. Hereinafter, the direction along the virtual axis O2 that passes through both the axes of the inner cylinder member 12 and the outer cylinder member 13 and is orthogonal to both axes is referred to as the vertical direction, and the axis O1 side of the inner cylinder member 12 along the vertical direction. Is called the upper side, the axis line side of the outer cylinder member 13 is called the lower side, and the direction perpendicular to both the axis O1 of the inner cylinder member 12 and the virtual axis O2 is called the left-right direction. The direction along the axis O1 of the inner cylinder member 12 is referred to as the axial direction, the direction orthogonal to the axis O1 of the inner cylinder member 12 is referred to as the radial direction, and the direction of circling around the axis O1 of the inner cylinder member 12 is the circumferential direction. That's it.

  As shown in FIG. 3, the inner peripheral surface of the outer cylinder member 13 is defined by a plurality of flat wall surfaces, and is formed in a polygonal shape in a front view as viewed from the axial direction. In the present embodiment, the outer cylinder member 13 is formed in a polygonal cylinder shape, and the surface is constituted by a plurality of wall portions 16, 17, 18, and 19 that define the flat wall surface. These wall portions 16, 17, 18, 19 extend in the left-right direction and are arranged in a pair of first horizontal wall portions 16, 17 that are opposed to each other in the vertical direction, and a pair of first horizontal wall portions 16, 17 And a pair of first vertical wall portions 18 disposed on both outer sides in the left-right direction and extending in the up-down direction.

  Both ends in the left-right direction of the upper first horizontal wall portion 16 positioned on the upper side of the first horizontal wall portions 16 and 17 are connected to the upper end portion of the first vertical wall portion 18 via corner portions. . Moreover, the both ends of the left-right direction of the lower 1st horizontal wall part 17 located in the lower side among the 1st horizontal wall parts 16 and 17 are separately connected to the lower end part of the 1st vertical wall part 18 via a corner | angular part. These corners are chamfered wall portions 19 that are narrowed to the inside in the radial direction from the outside in the circumferential direction toward the inside and extend so as to incline to the virtual axis O2. Yes.

The first horizontal wall portions 16 and 17, the first vertical wall portion 18 and the chamfered wall portion 19 are all formed in a flat plate shape, and the outer peripheral surface of the outer cylinder member 13 is hexagonal in the front view. It has a hexagonal cylindrical shape.
A connecting member 20 that connects the outer cylinder member 13 to the other of the vibration generating part and the vibration receiving part is connected to the outer peripheral surface of the outer cylinder member 13.

  As shown in FIG. 2, the size of the inner cylinder member 12 in the axial direction is smaller than the size of the outer cylinder member 13 in the axial direction. The inner cylinder member 12 is disposed in the outer cylinder member 13 so as to be shifted to one side in the axial direction with respect to the outer cylinder member 13. The edge on the one side of the cylindrical member 13 is equivalent in axial position, and the edge located on the other side of the inner cylindrical member 12 opposite to the one side is the edge of the outer cylindrical member 13. It is located on the one side from the edge on the other side.

  As shown in FIG. 3, the inner cylinder member 12 has a double cylinder structure including an inner connecting cylinder 21 and an outer surrounding cylinder 22 arranged coaxially with the axis O <b> 1 of the inner cylinder member 12. The connecting cylinder 21 is connected to the bracket 11, and the surrounding cylinder 22 surrounds the connecting cylinder 21 from the outside in the radial direction, and both the cylinders 21 and 22 are configured separately. Moreover, in this embodiment, the connection cylinder 21 is made into a cylindrical shape, and the surrounding cylinder 22 is a square cylinder shape whose inner peripheral surface forms a quadrangular shape in the front view.

  The surrounding cylinder 22 has a pair of second horizontal wall portions 23 and 24 extending in the left-right direction and a pair of second vertical wall portions 25 extending in the vertical direction, which are connected via four corners. Become. In the illustrated example, the lower second horizontal wall portion 24 located on the lower side of the pair of second horizontal wall portions 23 and 24 and the pair of second vertical wall portions 25 are integrally formed, The connecting body 26 and the upper second lateral wall portion 23 located on the upper side of the pair of second lateral wall portions 23 and 24 are formed separately, and the left and right direction of the upper second lateral wall portion 23 is formed in the left-right direction. Both ends are connected to the connecting body 26 by welding.

  A bulging portion 27 that bulges upward is formed at the central portion in the left-right direction of the upper second horizontal wall portion 23. In addition, a protruding portion 28 that protrudes downward is formed at the central portion of the lower second horizontal wall portion 24 in the left-right direction. The projecting portion 28 has a triangular shape projecting downward in the front view, and gradually extends in the left-right direction of the pair of inclined wall portions 29 extending downward from the outer side in the left-right direction toward the inner side. Are connected on the virtual axis O2. Each of these inclined wall portions 29 faces the chamfered wall portion 19 of the outer cylinder member 13 in the radial direction.

The connecting cylinder 21 and the surrounding cylinder 22 are in contact with each other at a plurality of locations separated in the circumferential direction, and are connected to each other by welding at these contact portions. In the illustrated example, the connecting cylinder 21 is in contact with the bulging portion 27 and the pair of inclined wall portions 29 in the surrounding tube 22.
Further, the inner cylinder member 12 is covered with a rubber cover 30. The rubber covering 30 is filled between the outer peripheral surface of the surrounding tube 22 and the inner peripheral surface of the surrounding tube 22 to connect both, and covers the outer peripheral surface of the surrounding tube 22.

  The rubber elastic body 14 protrudes downward (in the direction in which the rubber elastic body protrudes from the inner cylinder member side toward the outer cylinder member side) from the outer peripheral surface of the inner cylinder member 12. In this embodiment, the rubber elastic body 14 is vulcanized and bonded separately to the inclined wall portion 29 of the inner cylindrical member 12 and the chamfered wall portion 19 of the outer cylindrical member 13 that are opposed to each other in the radial direction. In this example, it is formed in a rod shape that gradually extends outward in the left-right direction as it goes downward. An axis (not shown) of the rubber elastic body 14 intersects each of the inclined wall portion 29 and the chamfered wall portion 19 and is substantially orthogonal in the illustrated example, and the rubber elastic body 14, the inclined wall portion 29 and the chamfered portion are Each adhesive strength with the wall portion 19 is ensured satisfactorily, and each adhesive force is easily maintained.

  The rubber elastic body 14 is formed integrally with the rubber cover 30. Further, in the present embodiment, the rubber elastic body 14 includes the first restriction rubber 31 and the second restriction rubber 32 disposed on the inner peripheral surface of the outer cylinder member 13, and the first restriction on the inner peripheral surface of the outer cylinder member 13. The rubber 31 and the second restriction rubber 32 are connected via a rubber film 38 that covers a portion where the rubber 31 and the second restriction rubber 32 are not disposed. The rubber elastic body 14, the first restriction rubber 31, and the second restriction rubber 32 are integrally formed. Is formed.

The first regulating rubber 31 regulates the relative movement amount of the inner cylinder member 12 and the outer cylinder member 13 in the left-right direction. The first regulating rubber 31 is separately disposed in each of the pair of first vertical wall portions 18 of the outer cylinder member 13 at portions facing the second vertical wall portion 25 of the inner cylinder member 12 in the left-right direction. . Further, as shown in FIG. 4, the first regulating rubber 31 extends over the entire length of the outer cylinder member 13 in the axial direction and protrudes toward the inner side in the left-right direction. It has a triangular shape that protrudes inward in the left-right direction.
Then, when the inner cylinder member 12 and the outer cylinder member 13 move relatively in the left-right direction, the first regulating rubber 31 abuts on the second vertical wall portion 25 facing the first regulating rubber 31. To regulate.

The second restriction rubber 32 restricts the amount of relative upward movement of the inner cylinder member 12 with respect to the outer cylinder member 13. The second regulating rubber 32 extends over the entire length of the outer cylinder member 13 in the axial direction at a portion of the upper first horizontal wall portion 16 of the outer cylinder member 13 that faces the bulging portion 27 of the inner cylinder member 12. It is arranged like this. The second regulating rubber 32 has a rectangular shape that is long in the left-right direction in the front view.
Then, when the inner cylinder member 12 moves upward relative to the outer cylinder member 13, the second regulating rubber 32 regulates the amount of movement by contacting the bulging portion 27.

As shown in FIG. 2, the bracket 11 is formed in a rod shape extending in the axial direction, and an end portion located on the one side is fitted in the connecting cylinder 21 of the inner cylinder member 12.
In the present embodiment, the stopper 15 is a stopper protrusion that protrudes downward from a portion of the bracket 11 that protrudes in the axial direction from the inner cylinder member 12 and is separated from the pair of rubber elastic bodies 14 in the axial direction. 33 and a stopper rubber portion 34 disposed in a portion of the inner peripheral surface of the outer cylinder member 13 that faces the tip of the stopper projection 33. The stopper 15 restricts the amount of movement of the inner cylinder member 12 relative to the outer cylinder member 13 downward.

  The stopper rubber portion 34 is disposed on the lower first horizontal wall portion 17. The stopper rubber portion 34 is disposed over the entire surface of the lower first lateral wall portion 17 and has a rectangular shape that is long in the left-right direction in the front view as shown in FIG. The parts are individually connected to the rubber elastic body 14. In the illustrated example, the surface 35 of the stopper rubber portion 34 extends so as to be orthogonal to the vertical direction, and as shown in FIG. An extending escape recess 36 is provided.

As shown in FIG. 2, the stopper protrusion 33 protrudes downward from a portion of the bracket 11 that is adjacent to the inner cylinder member 12 from the other side and that does not overlap with the rubber elastic body 14 in the axial direction. At least a part of the stopper projection 33 is located in the outer cylinder member 13. Further, the front end surface 37 of the stopper projection 33 is parallel to the surface 35 of the stopper rubber portion 34 and faces the portion located on the other side of the surface 35 in the vertical direction.
In such a stopper 15, when the inner cylinder member 12 and the outer cylinder member 13 approach and move so as to sandwich the rubber elastic body 14, the approach movement amount is such that the front end surface 37 of the stopper protrusion 33 and the surface of the stopper rubber part 34. It is regulated by contact with 35.

  The anti-vibration device 10 configured as described above can be used as a front mount for supporting a horizontally mounted engine as the vibration generating unit in a front engine / front drive vehicle (FF vehicle) of an automobile, for example. Is possible. At this time, for example, the inner cylinder member 12 can be connected to the engine via the bracket 11, and the outer cylinder member 13 can be connected to the vehicle body as the vibration receiving portion. In this case, the vertical direction is the main vibration direction in which main vibration is input from the engine to the vehicle body, the lower side is the bounce side where the static load (initial load) is input to the vibration isolator 10, and the upper side is the bounce side. It becomes the rebound side of the opposite side, and the left-right direction is the secondary vibration direction in which the secondary vibration is input from the engine to the vehicle body. The above-mentioned engine is a general term for the entire power unit including a transmission associated with the engine.

As described above, according to the vibration isolator 10 according to the present embodiment, since the stopper 15 is provided, the rubber elastic body 14 is provided without providing a rubber protrusion as in the conventional vibration isolator. The approaching movement amount of the inner cylinder member 12 and the outer cylinder member 13 sandwiched can be regulated. Since the stopper protrusion 33 protrudes from the pair of rubber elastic bodies 14 in the bracket 11 in the axial direction, the distance between the rubber elastic body 14 and the stopper protrusion 33 can be easily secured. For example, it is difficult to make the stopper protrusion 33 and the pair of rubber elastic bodies 14 come into contact with each other, or a pair of impact forces generated when the stopper protrusion 33 and the stopper rubber part 34 are in contact with each other. The rubber elastic body 14 can be made difficult to propagate.
From the above, the load applied from the stopper 15 to the rubber elastic body 14 can be suppressed.

Further, since the inner peripheral surface of the outer cylinder member 13 is formed in a polygonal shape in the front view, the rubber elastic body 14 among the plurality of flat wall surfaces defining the inner peripheral surface of the outer cylinder member 13 is The flat wall surface to be bonded and the flat wall surface to which the stopper rubber portion 34 is bonded can be easily made different from each other with less design restrictions.
Therefore, for example, without making the outer cylinder member 13 or the inner cylinder member 12 large, the adhesive strength between the rubber elastic body 14 and the stopper rubber portion 34 and the inner peripheral surface of the outer cylinder member 13, and the rubber elastic body 14 and the stopper protrusion 33 can be easily and reliably secured.

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, the rubber covering 30, the first restriction rubber 31, the second restriction rubber 32, and the rubber film 38 may be omitted.
Moreover, in the said embodiment, although the internal peripheral surface of the outer cylinder member 13 shall be hexagonal shape, it is not restricted to this, For example, the polygonal shape different from rectangular hexagonal shape may be sufficient. Even if it exists, like this embodiment, the flat wall surface which defines the inner peripheral surface of the outer cylinder member 13 may extend along the up-down direction, or may extend along the left-right direction. It may be.
Furthermore, the inner peripheral surface of the outer cylinder member 13 may not be polygonal in the front view.

Moreover, in the said embodiment, although the connection cylinder 21 and the surrounding cylinder 22 shall be comprised separately, it is not restricted to this, You may be comprised integrally.
Furthermore, in the said embodiment, although the inner cylinder member 12 shall be a double cylinder structure, it is not restricted to this, For example, it is the multiple cylinder structure more than triple, or it is comprised by one cylindrical body etc. May be.

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

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Bracket 12 Inner cylinder member 13 Outer cylinder member 14 Rubber elastic body 15 Stopper 33 Stopper protrusion 34 Stopper rubber part

Claims (2)

A bracket connected to one of the vibration generator and the vibration receiver;
An inner cylinder member to which the bracket is attached;
An outer cylinder member connected to the other of the vibration generating part and the vibration receiving part and surrounding the inner cylinder member from the outside in the radial direction;
A pair of rubber elastic bodies protruding from the outer peripheral surface of the inner cylindrical member and having a tip end portion reaching the inner peripheral surface of the outer cylindrical member;
A vibration isolator comprising: a stopper that regulates an approach movement amount of the inner cylinder member and the outer cylinder member sandwiching the rubber elastic body,
The stopper is
In the bracket, the rubber elastic body protrudes from the inner cylinder member in the axial direction and is separated from the pair of rubber elastic bodies in the axial direction, and the rubber elastic body is directed from the inner cylinder member side toward the outer cylinder member side. A stopper protrusion protruding toward the protruding direction;
A vibration isolator, comprising: a stopper rubber portion disposed in a portion of the inner peripheral surface of the outer cylinder member facing the tip portion of the stopper protrusion. The vibration isolator according to claim 1,
The anti-vibration device according to claim 1, wherein an inner peripheral surface of the outer cylinder member is formed in a polygonal shape when viewed from the axial direction.

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