JP4885770B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator that is interposed between a vehicle body and an engine of an automobile and suppresses transmission of vibrations to the vehicle body side.

  Usually, an anti-vibration device for suppressing transmission of vibration to the vehicle body side is assembled between the vehicle body of the automobile and the engine that is a vibration generation source (see, for example, Patent Document 1 below). As such an anti-vibration device, there is one provided with a connecting rod provided with anti-vibration bushes at both ends in the longitudinal direction of the arm, and a bracket interposed between one of the anti-vibration bushes and the engine. Although the vibration along the longitudinal direction of the arm is mainly input to the vibration isolator and the vibration generated thereby is attenuated by the vibration isolating bush, some load may be transmitted to the bracket and input. . For this reason, as a matter of course, it is necessary to appropriately ensure the durability of the bolts connecting the bracket and the vibration-isolating bushing.

As a bracket provided in the vibration isolator as described above, one formed of an aluminum alloy is known in order to reduce the weight of an automobile. Conventionally, it has been manufactured by cutting almost the entire surface of an aluminum alloy material, but there has been a problem that the cutting time becomes long and the productivity is hindered. On the other hand, it is conceivable to cast the bracket, but there is a problem that durability is lowered when a nest is formed in the molded product.
JP 2005-225321 A

  This invention is made | formed in view of the said situation, The objective is to provide the vibration isolator which can ensure durability appropriately, being excellent in productivity and weight reduction.

The above object can be achieved by the present invention as described below. That is, the vibration isolator according to the present invention is a vibration isolator interposed between the vehicle body and the engine.
An arm, a first vibration isolation bush provided at one end of the arm and connected to the vehicle body side, and a second vibration isolation bush provided at the other end of the arm and connected to the engine side. A connecting rod;
A bracket interposed between the second anti-vibration bush and the engine,
The bracket is
The height dimension is larger than the width dimension, has a block shape elongated in the first direction perpendicular to the height direction and the width direction, and a plurality of bolt insertion holes along the height direction are spaced in the first direction. A plurality of first mounting bolts formed and inserted into the plurality of bolt insertion holes, respectively, and a bracket main body configured so that one end surface in the height direction can be attached to a mounted surface on the engine side;
A female thread portion is formed that protrudes in a wall shape from one side surface of the bracket body in the width direction and that is screwed with a second mounting bolt on a mounting surface that is inclined with respect to the first direction at the top surface. A first protruding portion,
Of the other end surface in the height direction of the bracket body, the second vibration-proof bushing protrudes in a wall shape in the height direction from the first other end surface portion located between the pair of bolt insertion holes, and on the side surface of the top portion. And a second projecting portion provided with a receiving surface for receiving the inner cylinder, and integrally cast with an aluminum alloy so as to form an L-shaped cross section in the first direction view,
The first anti-vibration bush is connected to the vehicle body side, one end of the clamping plate is attached to the attachment surface by the second attachment bolt, and one end surface of the bracket body in the height direction is attached to the covered surface by the first attachment bolt. The receiving surface is configured to clamp the inner cylinder in the axial direction of the inner cylinder in cooperation with the other end of the clamping plate in a state of being attached to the mounting surface.

  In the vibration isolator according to the present invention, as described above, the first vibration isolating bush of the connecting rod is connected to the vehicle body side, and one end surface of the bracket main body in the height direction is attached to the mounting surface of the engine. It is done. The mounting surface provided on the top surface of the first projecting portion of the bracket is formed with an internal thread portion into which the second mounting bolt is screwed. One end of the clamping plate is attached to the mounting surface by fastening the second mounting bolt. The part is fixedly attached. A receiving surface for receiving the inner cylinder of the second vibration isolating bush is provided on the side surface of the top portion of the second projecting portion of the bracket. The second anti-vibration rubber bush is formed by the receiving surface and the other end of the sandwiching plate. The inner cylinder is clamped in the axial direction.

  In order to manufacture the bracket, after the bracket body, the first projecting portion, and the second projecting portion are integrally cast and formed of an aluminum alloy, at least the first end surface and the other end surface in the height direction of the bracket body are at least first. It is only necessary to cut the other end surface portion fastened to the mounting bolt, the mounting surface provided on the top surface of the first projecting portion, and the receiving surface provided on the side surface of the top portion of the second projecting portion. In addition, the cutting time can be shortened compared with the means for manufacturing the bracket by cutting almost the entire surface of the aluminum alloy material.

  Further, in this vibration isolator, since the inner cylinder of the second vibration isolating bush is sandwiched between the receiving surface of the second projecting portion and the other end of the clamping plate as described above, the longitudinal direction of the arm When the load is input in the direction of tilting, the load is easily transmitted and input to the holding plate, and further input to the second mounting bolt that fixes one end of the holding plate. Therefore, in the present invention, the mounting surface is provided on the top surface of the first projecting portion so as to be inclined with respect to the first direction, thereby reducing the shearing force acting on the second mounting bolt and increasing the durability. Can do. As a result, in the vibration isolator of the present invention, productivity and weight reduction are good, and durability can be appropriately ensured.

In the above, the plurality of bolt insertion holes are constituted by a total of three bolt insertion holes including a first bolt insertion hole, a second bolt insertion hole, and a third bolt insertion hole, and the first bolt insertion hole The distance between the hole and the second bolt insertion hole is set to be larger than the distance between the second bolt insertion hole and the third bolt insertion hole;
The first protrusion is protruded from one side surface portion located between the first bolt insertion hole and the second bolt insertion hole, of one side surface in the width direction of the bracket body,
The second protrusion is protruded from the first other end surface portion located between the first bolt insertion hole and the second bolt insertion hole,
The width dimension of the bracket main body portion between the second bolt insertion hole and the third bolt insertion hole is set to the width of the bracket main body portion between the first bolt insertion hole and the second bolt insertion hole. What is set smaller than the width dimension is preferable.

  According to the above configuration, the interval between the first bolt insertion hole and the second bolt insertion hole is set larger than the interval between the second bolt insertion hole and the third bolt insertion hole, and the first projecting portion Projecting from one side surface portion located between the first bolt insertion hole and the second bolt insertion hole, the length of the first protrusion in the longitudinal direction (first direction) of the bracket body is set large. be able to. Further, the length of the second protrusion in the longitudinal direction of the bracket body is caused by protruding the second protrusion from the first other end surface portion located between the first bolt insertion hole and the second bolt insertion hole. Can be set large. Thereby, the strength of the first protrusion and the second protrusion to which a large force is applied can be increased and sufficient durability can be ensured.

  Furthermore, according to the above configuration, the bracket main body is formed into a compact shape having an elongated block shape, and the width of the bracket main body portion between the second bolt insertion hole and the third bolt insertion hole is set to the first bolt insertion. By setting it to be smaller than the width dimension of the bracket body portion between the hole and the second bolt insertion hole, a nest is less likely to occur during casting. The bracket body portion between the second bolt insertion hole and the third bolt insertion hole should not be applied with a larger force than the bracket body portion between the first bolt insertion hole and the second bolt insertion hole. Therefore, even if the width dimension is reduced as described above, no problem occurs.

  In the above, it is preferable that the width dimension between the bracket main body and the top of the second protrusion is set smaller than the width of the top of the second protrusion and the bracket main body. According to such a configuration, since the volume of the portion between the bracket body and the top of the second protrusion is relatively small, it is possible to prevent the formation of a nest during casting, and the second protrusion Durability can be suitably secured.

  In the above, at least a pair of flat surfaces extending in the axial direction may be provided on the outer peripheral surface of the inner cylinder of the first vibration isolation bush or the inner cylinder of the second vibration isolation bush. Thereby, it can distinguish easily from the inner cylinder in which the flat surface is not provided, for example, can identify easily whether the said inner cylinder is iron or aluminum.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of a vibration isolator according to the present invention. FIG. 2 is a front view of the vibration isolator, and FIG. 3 is a side view of the vibration isolator. This anti-vibration device includes a connecting rod 1 (torque rod) shown in FIGS. 4 and 5 and a bracket 5 shown in FIGS. 6 to 8, and is assembled between the vehicle body of the automobile and an engine which is a vibration generating source. It is done.

  The connecting rod 1 is made of a metal material, and as shown in FIGS. 4 and 5, an arm 2 that extends in the front-rear direction of the vehicle, and a first vibration-isolating bush 3 that is provided at one end 21 of the arm 2 and is connected to the vehicle body side. The second vibration isolating bush 4 is provided at the other end 22 of the arm 2 and connected to the engine side. A damper 10 containing a mass member is attached to a side surface of the arm 2, and vibration generated in the arm 2 is suppressed when the mass member resonates via a rubber-like elastic body. One end 21 of the arm 2 is fixed to the outer peripheral surface of the first cylindrical portion 23 and the other end 22 is fixed to the outer peripheral surface of the second cylindrical portion 24 by welding.

  The first anti-vibration bush 3 has a cylindrical shape and is provided with its axial direction facing the height direction Z (the vehicle vertical direction). On the other hand, the second anti-vibration bush 4 has a cylindrical shape larger in diameter than the first anti-vibration bush 3 and is provided with its axial direction directed in the width direction W (vehicle width direction). The first anti-vibration bush 3 and the second anti-vibration bush 4 are provided such that planes perpendicular to the respective axial directions are orthogonal to each other, and are configured to effectively suppress vibration in the roll direction of the engine. ing.

  The first anti-vibration bush 3 includes an inner cylinder 31, an outer cylinder 32 that surrounds the inner cylinder 31 in an axially parallel manner, and a rubber-like elasticity that is interposed between the inner cylinder 31 and the outer cylinder 32 to elastically connect them. And a body 33. The outer cylinder 32 is press-fitted into the first cylindrical portion 23 in a state where the diameter has been reduced by drawing. The second anti-vibration bush 4 includes an inner cylinder 41, an outer cylinder 42 that surrounds the inner cylinder 41 in an axially parallel manner, and a rubber that is interposed between the inner cylinder 41 and the outer cylinder 42 to elastically connect them. And an elastic body 43. The outer cylinder 42 is press-fitted into the second cylindrical portion 24 while being reduced in diameter by drawing.

  The rubber-like elastic body 43 of the second vibration-proof bushing 4 is provided with a cavity portion 44 that faces the arm side and the non-arm side across the inner cylinder 41 and extends in the circumferential direction with a required width. The hollow portion 44 is provided with a stopper rubber portion 45 that protrudes radially inward from the inner peripheral surface of the outer cylinder 42, so that the input of the inner cylinder 41 with respect to the input along the longitudinal direction L of the arm 2 Excessive displacement is limited by contacting the outer peripheral surface. The outer peripheral surface of the inner cylinder 41 is covered with a thin rubber layer 46. The stopper rubber portion 45 is provided with a small cavity 47 extending in the axial direction. Accordingly, the dynamic spring constant can be reduced while maintaining the static spring constant by the stopper rubber portion 45, and riding comfort can be improved.

  In the present embodiment, the inner cylinder 31 of the first vibration isolation bush 3 has a circular cross section, whereas the inner cylinder 41 of the second vibration isolation bush 4 has a thickness in the direction along the longitudinal direction L of the arm 2. It has an irregular cross-sectional shape that is larger than the thickness in the direction perpendicular thereto. Thereby, the stopper rubber part 45 can be appropriately received with respect to the input along the longitudinal direction L of the arm 2 to limit the excessive displacement.

  As shown in FIGS. 6 to 8, the bracket 5 includes a bracket main body 6 having a height dimension H larger than the width dimension D and an elongated block shape in a first direction N orthogonal to the height direction Z and the width direction W. The first projecting portion 7 and the second projecting portion 8 are formed so as to project from the bracket body 6 in the shape of a wall, and they are L-shaped in section in the first direction N (side view) as shown by the broken line in FIG. It is integrally cast with an aluminum alloy so as to form a shape.

  The first projecting portion 7 projects in a wall shape in the width direction W from one side surface 63 of the bracket body 6 in the width direction W, and the length in the first direction N is smaller than that of the bracket body 6 as shown in FIG. 7, the length in the height direction Z is smaller than that of the bracket body 6, and the length in the first direction N is gradually reduced toward the top surface to form a deformed trapezoidal shape in plan view. I am doing. Moreover, the 2nd protrusion part 8 protrudes in the wall direction from the other end surface 62 of the height direction Z of the bracket main body 6 to the height direction Z, and the length of the 1st direction N is longer than the bracket main body 6 as shown in FIG. Is formed in a triangular shape with the length in the first direction N gradually reduced toward the top, and the tip is rounded in front view.

  A plurality of bolt insertion holes 11 to 13 along the height direction Z are formed in the bracket body 6 at intervals in the first direction N, and a plurality of bolt insertion holes 11 to 13 are individually inserted through the plurality of bolt insertion holes 11 to 13. The first mounting bolt 14 (see FIG. 2) is configured so that one end surface 61 in the height direction Z of the bracket body 6 can be mounted on the mounting surface E on the engine side.

  The plurality of bolt insertion holes are composed of a first bolt insertion hole 11, a second bolt insertion hole 12, and a third bolt insertion hole 13 arranged in the first direction N, all of which are in the first direction N. It is formed in a long hole having a long cross-sectional oval shape. The interval between the first bolt insertion hole 11 and the second bolt insertion hole 12 adjacent to each other is set larger than the interval between the second bolt insertion hole 12 and the third bolt insertion hole 13 adjacent to each other. Yes.

  The first projecting portion 7 projects in the width direction W from one side surface portion 63 </ b> A located between the first bolt insertion hole 11 and the second bolt insertion hole 12 in one side surface 63 of the bracket body 6 in the width direction W. It is provided as follows. The top surface of the first projecting portion 7 is provided with a mounting surface 71 for attaching one end portion 91 of the metal clamping plate 9 shown in FIGS. 9 to 11, and a second mounting for mounting and fixing the clamping plate 9. A first female thread portion 72 for screwing the bolt 73 is formed.

  The mounting surface 71 is inclined with respect to the first direction N as shown in FIGS. 1 and 6. In this embodiment, the mounting surface 71 is inclined toward the bracket body 6 toward the first vibration isolating bush 3. Is provided. The first female threaded portion 72 to which the second mounting bolt 73 having the mounting surface 71 as a fastening surface is screwed is formed in a direction inclined with respect to the width direction W as shown in FIG. The inclination angle of the mounting surface 71 with respect to the first direction N is preferably 45 ± 20 °, more preferably 45 ± 15 °, from the viewpoint of appropriately ensuring the durability improvement effect described later.

  The second projecting portion 8 has a height direction from the first other end surface portion 62 </ b> A located between the first bolt insertion hole 11 and the second bolt insertion hole 12 in the other end surface 62 in the height direction Z of the bracket body 6. It is provided so as to protrude to Z. A receiving surface 81 for receiving the inner cylinder 41 of the second vibration isolating bush 4 is provided on the side surface of the top portion of the second protrusion 8, and a third mounting bolt 83 inserted through the inner cylinder 41 is screwed together. A second female thread portion 82 is formed in the width direction W.

  In this vibration isolator, the first vibration isolating bush 3 of the connecting rod 1 is connected to the vehicle body side, one end 91 of the clamping plate 9 is attached to the attachment surface 71 by the second attachment bolt 73, and the height direction of the bracket body 6 is increased. In a state where one end face 61 of Z is attached to the engine-side attached face E by the plurality of first attaching bolts 14, the receiving face 81 holds the inner cylinder 41 and the other end of the clamping plate 9 as shown in FIGS. The inner cylinder 41 is configured to be held in the axial direction in cooperation with the portion 92.

  Specifically, the third mounting bolt 83 is inserted into the bolt insertion hole 93 formed in the other end portion 92 of the clamping plate 9 and the inner cylinder 41 of the second vibration-proof bushing 4, and the third mounting bolt 83 is received. The second internal thread portion 82 formed on the surface 81 is screwed together. That is, the inner cylinder 41 is clamped and fixed in the axial direction between the other end portion 92 of the clamping plate 9 and the receiving surface 81 by screwing and fastening the third mounting bolt 83.

  The clamping plate 9 has one end 91 attached to the attachment surface 71 inclined with respect to the first direction N and the other end 92 attached to the receiving surface 81 along the first direction N as shown in FIGS. As shown in FIG. 4, the hole axis of the bolt insertion hole formed in the one end portion 91 and the hole axis of the bolt insertion hole 93 formed in the other end portion 92 are provided so as to intersect each other.

  3 and 8, the portion 84 between the bracket main body 6 and the top of the second projecting portion 8 is provided with a thin wall, and the width dimension (thickness) is the second projecting portion. It is set smaller than the width portion D of the top portion 85 of the portion 8 and the bracket body 6. Thereby, the volume of the 2nd protrusion part 8 can be reduced, the generation | occurrence | production of the nest at the time of casting can be prevented, and the durability of the 2nd protrusion part 8 can be ensured suitably.

  In this embodiment, the width d1 of the bracket body portion 6A between the second bolt insertion hole 12 and the third bolt insertion hole 13 is set to the first bolt insertion hole 11 and the second bolt insertion hole 12. It is made smaller than the width dimension (equivalent to the width dimension D) of the bracket main-body part in between. Such a shape can prevent the formation of nests during casting.

  The bracket 5 has a machining allowance on a second other end surface portion 62B fastened to the first mounting bolt 14, a mounting surface 71 provided on the first projecting portion 7, and a receiving surface 81 provided on the second projecting portion 8. The bracket body 6, the first projecting portion 7 and the second projecting portion 8 are integrally cast with an aluminum alloy. The part that has left the machining allowance is cut after casting. Therefore, compared with the case where it manufactures by cutting almost the whole surface of the conventional aluminum alloy material, cutting time is reduced significantly and the productivity of a vibration isolator is improved significantly.

  Further, when a load is input in a direction inclined with respect to the longitudinal direction L of the arm 2, for example, a direction in which the longitudinal direction L in FIG. 4 is slightly inclined clockwise, the load is transmitted to the clamping plate 9 and input. It is also easy to input to the second mounting bolt 73 that fixes the one end 91 of the clamping plate 9. In this vibration isolator, the mounting surface 71 is inclined with respect to the first direction N. The shearing force acting on the second mounting bolt 73 can be reduced to increase the durability. In the present embodiment, since only one female thread portion (first female thread portion 72) is provided on the mounting surface 71, the above-described configuration that can easily concentrate stress through the clamping plate 9 and can improve durability is particularly useful. It becomes.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. The shape and characteristics of the vibration isolating bushes 3 and 4 included in the connecting rod 1 are as follows. Etc. can be appropriately changed according to the application and use conditions. Therefore, for example, a pair or more flat surfaces 34 extending in the axial direction opposite to each other as shown in FIG. 12 may be provided on the outer peripheral surface of the inner cylinder 31 of the vibration isolating bush 3, and based on the difference in shape. For example, it is possible to identify whether the material of the inner cylinder 31 is made of iron or aluminum.

  Also in the bracket 5, for example, in the other end face 62 in the height direction Z of the bracket body 6, a cutting allowance is left entirely on a portion other than the first other end face portion 62 </ b> A from which the first projecting portion 7 projects. The bracket body 6, the first projecting portion 7, and the second projecting portion 8 may be integrally cast with an aluminum alloy.

The top view which shows an example of the vibration isolator which concerns on this invention Front view of the vibration isolator Side view of the vibration isolator Top view of connecting rod Front view of connecting rod Top view of bracket Front view of bracket Side view of bracket Plan view of the clamping plate Front view of the clamping plate Side view of the clamping plate The top view which shows another embodiment of the inner cylinder of a 1st anti-vibration bush

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connecting rod 2 Arm 3 1st anti-vibration bush 4 2nd anti-vibration bush 5 Bracket 6 Bracket main body 6A Bracket main-body part 7 between 2nd bolt insertion hole and 3rd bolt insertion hole 1st protrusion part 8 1st 2 Protruding portion 9 Holding plate 11 Bolt insertion hole 12 Bolt insertion hole 13 Bolt insertion hole 14 First mounting bolt 21 One end 22 of the arm Other end 31 of the arm 31 Inner cylinder 34 of the first anti-vibration bush Flat surface 41 Second anti-vibration Inner cylinder 61 of the vibration bush One end surface 62 in the height direction of the bracket body The other end surface 62A in the height direction of the bracket body First end surface portion 63 One side surface 63A in the width direction of the bracket body One side surface portion 71 A mounting surface 72 1) Female thread portion 73 Second mounting bolt 81 Receiving surface 91 One end portion 92 of clamping plate The other end portion of clamping plate D Width dimension of bracket E Mounted on the engine side Height N first direction W the width direction Z height direction of the plane H bracket

Claims (4)

In the vibration isolator interposed between the vehicle body and the engine,
An arm, a first vibration isolation bush provided at one end of the arm and connected to the vehicle body side, and a second vibration isolation bush provided at the other end of the arm and connected to the engine side. A connecting rod;
A bracket interposed between the second anti-vibration bush and the engine,
The bracket is
The height dimension is larger than the width dimension, has a block shape elongated in the first direction perpendicular to the height direction and the width direction, and a plurality of bolt insertion holes along the height direction are spaced in the first direction. A plurality of first mounting bolts formed and inserted into the plurality of bolt insertion holes, respectively, and a bracket main body configured so that one end surface in the height direction can be attached to a mounted surface on the engine side;
A female thread portion is formed that protrudes in a wall shape from one side surface of the bracket body in the width direction and that is screwed with a second mounting bolt on a mounting surface that is inclined with respect to the first direction at the top surface. A first protruding portion,
Of the other end surface in the height direction of the bracket body, the second vibration-proof bushing protrudes in a wall shape in the height direction from the first other end surface portion located between the pair of bolt insertion holes, and on the side surface of the top portion. And a second projecting portion provided with a receiving surface for receiving the inner cylinder, and integrally cast with an aluminum alloy so as to form an L-shaped cross section in the first direction view,
The first anti-vibration bush is connected to the vehicle body side, one end of the clamping plate is attached to the attachment surface by the second attachment bolt, and one end surface of the bracket body in the height direction is attached to the covered surface by the first attachment bolt. An anti-vibration device configured so that the receiving surface clamps the inner cylinder in the axial direction of the inner cylinder in cooperation with the other end of the clamping plate in a state of being attached to the mounting surface. The plurality of bolt insertion holes are composed of a total of three bolt insertion holes, a first bolt insertion hole, a second bolt insertion hole, and a third bolt insertion hole, and the first bolt insertion hole and the The distance between the second bolt insertion hole and the second bolt insertion hole is set to be larger than the distance between the second bolt insertion hole and the third bolt insertion hole;
The first protrusion is protruded from one side surface portion located between the first bolt insertion hole and the second bolt insertion hole, of one side surface in the width direction of the bracket body,
The second protrusion is protruded from the first other end surface portion located between the first bolt insertion hole and the second bolt insertion hole,
The width dimension of the bracket main body portion between the second bolt insertion hole and the third bolt insertion hole is set to the width of the bracket main body portion between the first bolt insertion hole and the second bolt insertion hole. 2. The vibration isolator according to claim 1, wherein the vibration isolator is set smaller than the width dimension.   The vibration isolator according to claim 1 or 2, wherein a width dimension between the bracket main body and the top of the second protrusion is set smaller than a width of the top of the second protrusion and the bracket main body. .   The at least one pair of flat surface extended in an axial direction facing each other is provided in the outer peripheral surface of the inner cylinder of the said 1st anti-vibration bush, or the inner cylinder of the said 2nd anti-vibration bush. Anti-vibration device according to item.

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