JP4426602B2 - 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 is provided between an automobile body and an engine which is a vibration generation source in order to suppress transmission of vibration to the vehicle body side. In order to connect the vibration isolator to the engine, a bracket is interposed between the two and various bracket structures have been proposed (for example, see Patent Documents 1 and 2 below).

As such an anti-vibration device, an anti-vibration device having a connecting rod provided with anti-vibration bushes at both ends in the longitudinal direction of the arm and a bracket interposed between the anti-vibration bush and the engine is known. (See Patent Document 3 below).
JP-A-10-329554 JP 2005-225321 A JP 2005-188575 A

  Regarding the vibration isolator as described above, the present inventor has previously disclosed the following configuration in Japanese Patent Application No. 2006-314991 which has not been disclosed at the time of filing the present application. That is, the bracket interposed between the anti-vibration bush and the engine includes a bracket body having a long and narrow block shape in a first direction orthogonal to the height direction and the width direction. The bracket body is configured such that a first mounting bolt can be inserted into a plurality of bolt insertion holes provided along the height direction, and one end surface in the height direction can be attached to a mounting surface on the engine side. ing. A first rising wall that rises in the width direction from one side surface of the bracket body is provided, and a second rising wall that rises in the height direction from the other end surface of the bracket body. And the clamping plate which clamps an anti-vibration bush with this bracket is provided, and the one end part of this clamping plate is fastened and fixed using the 2nd mounting bolt with respect to the mounting surface provided in the top surface of the said 1st rising wall. is doing. In addition, a third attachment is made to the other end and the inner cylinder so that the other end of the clamping plate clamps the inner cylinder of the vibration isolating bush between the other end of the clamping plate and the receiving surface provided on the top of the second rising wall. A bolt is inserted and the third mounting bolt is fastened and fixed to a female thread portion provided on the receiving surface.

  As described above, in the configuration proposed previously, the bracket is used to hold the vibration isolating bushing by using a bolt to clamp the inner cylinder of the vibration isolating bush between the one end of the clamping plate and the bracket. In addition to fixing, the other end portion of the clamping plate is also fastened and fixed to the bracket using a separate bolt. For this reason, the number of assembling steps of the vibration isolator increases and a bolt for the other end is required, which increases the cost of parts. Further, it is necessary to provide a fixing surface part for fastening the bolt for the other end part on the bracket side, and accordingly, the amount of material used for the bracket is increased, and cutting work is also required.

  This invention is made | formed in view of the above point, The objective is to provide the vibration isolator excellent in productivity and useful for cost reduction and weight reduction.

  An anti-vibration device according to the present invention is an anti-vibration device interposed between a vehicle body and an engine, the arm, a first anti-vibration bush provided at one end of the arm and connected to the vehicle body side, A connecting rod having a second vibration isolating bush provided on the other end of the arm and coupled to the engine side; a bracket interposed between the second vibration isolating bush and the engine; and the bracket together with the bracket And a sandwiching plate that sandwiches the second vibration-proof bushing. The bracket includes a bracket body having a height dimension larger than the width dimension and having an elongated block shape in a first direction orthogonal to the height dimension and the width dimension, and the bracket body includes a bracket body in the height direction of the bracket body. A plurality of first bolt insertion holes are provided at intervals in the first direction, and are inserted into the plurality of bolt insertion holes separately from one end surface side in the height direction of the bracket body. The other end surface of the bracket body in the height direction can be attached to the mounting surface on the engine side with the mounting bolt. In addition, a protruding portion that protrudes in the width direction from one side surface of the bracket body in the width direction is provided, and a receiving surface that receives the inner cylinder of the second vibration-proof bushing is provided on the top surface of the protruding portion. In addition, a female screw portion into which the second mounting bolt is screwed is provided on the receiving surface. And the said clamping plate comprises L-shape which consists of a horizontal plate part extended in the said width direction from the said bracket main body, and a vertical plate part extended in the said height direction from the front-end | tip of the said horizontal plate part, The said vertical plate part The inner cylinder is clamped in the axial direction between the receiving surface and an end on the side by screwing the second mounting bolt inserted into the inner cylinder of the second vibration-proof bushing into the female thread. And an end portion on the side of the horizontal plate portion is superposed on one end surface portion provided with one or a plurality of the bolt insertion holes in the one end surface of the bracket main body, and the covered by the first mounting bolt. It is comprised so that it may fix to the said one end surface part by the fastening to an attachment surface.

  According to the above configuration, as a configuration for holding the second vibration isolating bush on the bracket, one end portion of the clamping plate is connected to the bracket by fastening the second mounting bolt inserted through the inner cylinder of the second vibration isolating bush. It is held between. On the other hand, the other end portion of the clamping plate is fixed using a first mounting bolt for fastening the bracket to the mounted surface on the engine side. Therefore, it is not necessary to use a separate bolt to fix the other end of the clamping plate to the bracket. Therefore, it is possible to reduce the number of steps for assembling the vibration isolator, reduce the number of parts by sharing bolts, reduce the amount of materials used by omitting the fixed surface on the bracket side, and reduce cutting work. This also leads to weight saving.

  In the vibration isolator of the present invention, the first anti-vibration bush and the second anti-vibration bush are provided so that planes perpendicular to the respective axes are orthogonal to each other, and the shaft of the first anti-vibration bush is the first anti-vibration bush. In the case where the two anti-vibration bushes are arranged at a position shifted to one side in the axial direction with respect to the center in the axial direction, the following configuration is preferable. That is, the bracket is arranged with the first direction along the longitudinal direction of the arm, and the plurality of bolt insertion holes are arranged in order from the side closer to the first vibration isolating bush, As the second bolt insertion hole and the third bolt insertion hole, the distance between the first bolt insertion hole and the second bolt insertion hole is such that the second bolt insertion hole and the third bolt insertion hole are One side surface portion that is set to be larger than the distance between the first bolt insertion hole and the second bolt insertion hole among the one side surface in the width direction of the bracket body. The end of the clamping plate on the side of the horizontal plate is provided with the second bolt insertion hole and the third bolt insertion hole in the one end surface of the bracket body. A first polymer is disposed on one end surface, and the first It is comprised so that it may fix to the said one end surface part by the fastening to the said to-be-attached surface by a volt | bolt, and the said 3rd bolt insertion hole is on the straight line which connects the said 1st bolt insertion hole and the said 2nd bolt insertion hole. To the other side in the axial direction.

  In the case where the first vibration isolation bush and the second vibration isolation bush are offset and arranged as described above, the third bolt insertion hole is arranged on a straight line connecting the second bolt insertion hole and the first bolt insertion hole. When provided at a position shifted to the other side in the axial direction, in the second bolt insertion hole and the third bolt insertion hole to which the end portion of the clamping plate is attached at the time of load input, As a result, the loosening of the first mounting bolt can be avoided and the durability can be improved.

  In the above configuration, the bracket is formed by integrally casting the bracket main body and the protruding portion with an aluminum alloy, and at least the first mounting bolt of the one end surface in the height direction of the bracket main body. When the one end surface portion to be fastened, the other end surface in the height direction, and the receiving surface provided on the top surface of the projecting portion are formed by cutting, the following effects are achieved. The That is, in this case, in order to manufacture the bracket, the bracket body and the projecting portion are integrally cast with an aluminum alloy, and then the one end surface portion and the other end surface of the bracket body and the receiving surface of the projecting portion are cut. Just do it. Therefore, the cutting time can be shortened as compared with the conventional one in which the bracket is manufactured by cutting almost the entire surface of the aluminum alloy material. Therefore, it is possible to provide a vibration isolator that is excellent in productivity and useful for weight reduction.

  According to the present invention, it is possible to reduce the number of assembling steps of the vibration isolator, reduce the number of parts by sharing the bolt, reduce the amount of material used by omitting the fixing surface portion on the bracket side, reduce cutting, and the like. Significant cost reduction can be achieved, leading to weight reduction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show a vibration isolator according to an embodiment. This vibration isolator includes a connecting rod (torque rod) 10, a bracket 12, and a clamping plate 14, and is assembled between an automobile body and an engine which is a vibration generating source, and the engine roll. It is what suppresses.

  The connecting rod 10 includes a metal arm 16 extending in the vehicle longitudinal direction X, a first vibration isolating bush 18 provided on one end 16A of the arm 16 and connected to the vehicle body side, and the other end 16B of the arm 16. And a second anti-vibration bush 20 connected to the engine side. A damper 22 containing a mass body is attached to a side surface of the arm 16, and vibration generated in the arm 16 is suppressed when the mass body resonates via a rubber-like elastic body. The arm 16 includes a first cylindrical portion 24 fixed to one end portion 16A by welding, and a second cylindrical portion 26 fixed to the other end portion 16B by welding.

  The first anti-vibration bush 18 has a cylindrical shape, and its axis A1 is provided substantially in the vehicle vertical direction Z. The second vibration isolating bush 20 has a cylindrical shape with a diameter larger than that of the first anti-vibration bush 18, and the axis A2 is provided in the vehicle width direction Y. The first anti-vibration bush 18 and the second anti-vibration bush 20 are provided so that planes perpendicular to the respective axes A1 and A2 are orthogonal to each other so that vibration in the roll direction of the engine can be effectively suppressed. It is configured.

  The first anti-vibration bush 18 is interposed between the inner cylinder 28 connected to the vehicle body side, the outer cylinder 30 surrounding the inner cylinder 28 in an axially parallel and coaxial manner, and the inner cylinder 28 and the outer cylinder 30. And a rubber-like elastic body 32 for connecting the two. The outer cylinder 32 is press-fitted into the first cylindrical portion 24 after being reduced in diameter by drawing. The second anti-vibration bush 20 includes an inner cylinder 34, an outer cylinder 36 that surrounds the inner cylinder 34 in an axially parallel and coaxial manner, and a rubber that is interposed between the inner cylinder 34 and the outer cylinder 36 to connect the two. And an elastic body 38. The outer cylinder 36 is pressed into the second cylindrical portion 26 after being reduced in diameter by drawing.

  The rubber-like elastic body 38 of the second vibration-proof bushing 20 is provided with a cavity 40 that faces the arm side and the non-arm side across the inner cylinder 34 and extends in the circumferential direction with a predetermined width. The hollow portion 40 is provided with a stopper rubber portion 42 that protrudes radially inward from the inner peripheral surface of the outer cylinder 36, and the inner cylinder 34 with respect to the input in the front-rear direction X along the longitudinal direction of the arm 16. The excessive displacement is limited by abutting on the outer peripheral surface.

  As shown in FIGS. 3 and 5, the first vibration isolating bush 18 is disposed offset from the axial center plane of the second vibration isolating bush 20. That is, the axis A1 of the first anti-vibration bush 18 is not on the same plane with respect to the center 20A in the axial direction of the second anti-vibration bush 20 (that is, the vehicle width direction Y). It is arranged at a position shifted to one side Y1. Here, the center 20A of the second vibration isolating bush 20 is a position that bisects the second vibration isolating bush 20 in the axial direction. In this example, the outer cylinder 36 of the second anti-vibration bush 20 is axially separated. The position is divided into two equal parts.

  The bracket 12 is interposed between the second anti-vibration bush 20 and the engine. As shown in FIGS. 6 to 8, the bracket 12 includes a bracket main body 44 and a protruding portion 46, which are made of an aluminum alloy. It is cast integrally.

  The bracket main body 44 has a height dimension H larger than the width dimension D, and has a block shape elongated in a first direction U perpendicular to the height direction S and the width dimension T. The bracket 12 is arranged on the side of the connecting rod 10 so that the first direction U, which is the longitudinal direction of the bracket body 44, is aligned with the vehicle longitudinal direction X, which is the longitudinal direction of the arm 16. The height direction S is substantially aligned with the vehicle vertical direction Z, and the width direction T of the bracket body 44 is substantially aligned with the vehicle width direction Y. Specifically, in this example, as shown in FIG. 5, the height direction S of the bracket body 44 is slightly inclined with respect to the vehicle vertical direction Z, and the inclination angle θ is set to about 10 °.

  A plurality of bolt insertion holes 50, 52, 54 along the height direction S are formed in the bracket body 44 at intervals in the first direction U. With respect to the plurality of bolt insertion holes 50, 52, 54, The bracket body 44 has a plurality of first mounting bolts 56 inserted separately from one end surface (here, the upper end surface) 44A side in the height direction S, and the other end surface of the bracket body 44 in the height direction S (here, The lower end surface 44B is configured to be attachable to the mounted surface 1 on the engine side (see FIGS. 4 and 5).

  The plurality of bolt insertion holes are composed of a first bolt insertion hole 50, a second bolt insertion hole 52, and a third bolt insertion hole 54 from the side close to the first vibration-isolating bushing 20, all of which are the first. It is formed in an oblong hole having a long oval cross section in the direction U. The interval between the first bolt insertion hole 50 and the second bolt insertion hole 52 adjacent to each other is set larger than the interval between the second bolt insertion hole 52 and the third bolt insertion hole 54 adjacent to each other. Yes.

  The projecting portion 46 extends in the width direction T from one side surface portion 44C1 located between the first bolt insertion hole 50 and the second bolt insertion hole 52 in one side surface 44C of the bracket body 44 in the width direction T. It is provided to protrude. In this example, the protruding portion 46 is provided so as to protrude in a columnar shape near the lower portion of the one side surface 44C. A receiving surface 58 for receiving the axial end surface of the inner cylinder 34 of the second vibration isolating bush 20 is provided on the top surface of the projecting portion 46, and a female screw for screwing the second mounting bolt 60 inserted through the inner cylinder 34. The part 62 is drilled in the width direction T.

  The bracket 12 includes an end surface portion 44A1 to which at least the first mounting bolt 56 is fastened among the one end surface 44A of the bracket body 44, the other end surface 44B, and a receiving surface 58 provided on the top of the projecting portion 46. The bracket main body 44 and the projecting portion 46 are integrally cast with an aluminum alloy, leaving a machining allowance. And after casting molding, the part which left the said cutting allowance is cut, and it shape | molds in the said shape.

  As shown in FIGS. 1 to 5, the clamping plate 14 is a member that clamps the second vibration isolating bush 20 together with the bracket 12, and is formed in an L shape by pressing a metal plate. Specifically, the clamping plate 14 extends from the one end surface 44A of the bracket body 44 to the horizontal lateral plate portion 64 that extends in the same width direction Y as the protruding direction of the protruding portion 46, and extends downward from the tip in the vertical direction Z. It consists of a vertical plate part 66.

  Then, the end portion 14A on the vertical plate portion 66 side, which is one end portion of the sandwiching plate 14, is screwed into the female screw portion 62 of the second mounting bolt 60 inserted through the inner cylinder 34 of the second vibration isolating bushing 20. The inner cylinder 34 is held between the receiving surface 58 in the axial direction. Specifically, a bolt insertion hole 68 is provided in the end portion 14 </ b> A of the clamping plate 14, and the second mounting bolt 60 is inserted through the bolt insertion hole 68 and the inner cylinder 34 of the second vibration isolation bush 20. By fastening the second mounting bolt 60 to the female threaded portion 62 of the receiving surface 58, the inner cylinder 34 is clamped in the axial direction between the end portion 14A of the clamping plate 14 and the receiving surface 58.

  On the other hand, the end 14B on the side of the horizontal plate 64, which is the other end of the clamping plate 14, is provided with a second bolt insertion hole 52 and a third bolt insertion hole 54 in one end surface 44A of the bracket body 44. The one end face portion 44A1 is superposed. The end portion 14B on the side of the horizontal plate 64 is fixed to the one end surface portion 44A1 by fastening the first mounting bolt 56 to the mounted surface 1 on the engine side.

  Specifically, the end portion 14B on the side of the horizontal plate portion 64 is provided with the same bolt insertion holes 70 and 72 that overlap the second bolt insertion hole 52 and the third bolt insertion hole 54, respectively. A seat surface portion 74 to which the mounting bolt 56 is fastened is formed. As shown in FIG. 8, in the bracket main body 44, one end surface portion 44 </ b> A <b> 1-1 provided with the second bolt insertion hole 52 and the third bolt insertion hole 54 receives the first seat surface portion 74. The one end surface portion 44 </ b> A <b> 1-2 provided with the bolt insertion hole 50 is formed to be stepped downward in the height direction S by a dimension α corresponding to the thickness of the seat surface portion 74. As a result, as shown in FIG. 4, the fastening surfaces for the first to third bolt insertion holes 50, 52, 54 have the same height in a state where the end portion 14 </ b> B on the side of the horizontal plate portion 64 is superposed. I have to.

  In this way, the end portion 14B on the side of the horizontal plate portion 64 arranged on the bracket main body 44 has the first mounting bolt 56 and the bolt insertion holes 70 and 72 of the end portion 14B when the bracket 12 is attached to the engine. The bracket 12 is fixed to the mounted surface 1 by inserting the first and second bolts 56 through the second and third bolt insertion holes 52 and 54 and fastening the first mounting bolt 56 to the mounted surface 1 on the engine side. Accordingly, the bracket body 44 is fixed.

  As shown in FIGS. 3 and 7, in the bracket main body 44, the third bolt insertion hole 54 is second to the straight line L connecting the centers of the first bolt insertion hole 50 and the second bolt insertion hole 52. The anti-vibration bushing 20 is provided at a position shifted to the other side Y2 in the axial direction (that is, the side opposite to the side where the protrusion 46 is provided in the width direction T of the bracket body 44). In response to the displacement of the third bolt insertion hole 54 in this way, the second bolt insertion hole 52, the third bolt insertion hole 54, and the other side surface 44 </ b> D of the bracket body 44 in the width direction T are provided. A stepped portion 76 is provided at an intermediate position.

  Reference numeral 78 denotes a first fixing portion to which a brake hose stay is fixed, and is integrally provided at one end of the bracket body 44 in the first direction U. Reference numeral 80 denotes a second fixing portion to which the hose stay is fixed, and is integrally provided at the other end portion of the bracket body 44 in the first direction U.

  In the vibration isolator configured as described above, the load at the time of vibration input is input in a direction connecting the axis A1 of the first vibration isolating bush 18 and the axial center 20A of the second vibration isolating bush 20. At this time, in the present embodiment, since the first vibration isolating bush 18 and the second vibration isolating bush 20 are provided offset, the load input direction F is relative to the front-rear direction X as shown in FIG. The force acts in a direction in which the arm 16 is twisted. Since the third bolt insertion hole 54 is biased as described above with respect to such an inclined load input, the second bolt insertion hole 52 and the second bolt insertion hole 52 to which the end portion 14B of the clamping plate 14 is attached are provided. In the third bolt insertion hole 54, stress or distortion at the mounting portion can be relaxed. Therefore, loosening of the first mounting bolt 56 can be avoided, and durability can be improved.

  In the present embodiment, the inner cylinder 34 of the second anti-vibration bush 20 is clamped between the one end 14 </ b> A of the clamping plate 14 and the receiving surface 58 of the bracket body 44 as a configuration for mounting the bracket 12 to the connecting rod 10. However, the other end portion 14B of the clamping plate 14 is fixed using a first mounting bolt 56 for fastening the bracket 12 to the mounted surface 1 on the engine side. Therefore, it is not necessary to use a separate bolt to fix the clamping plate 14 to the bracket 12. Therefore, the number of steps for assembling the vibration isolator can be reduced, the number of parts can be reduced by sharing the mounting bolts, the amount of material used can be reduced by omitting the fixing surface part on the bracket 12 side, and cutting work can be reduced. Cost can be reduced and the weight can be reduced.

  Further, in the present embodiment, the above-described configuration of the bracket 12 makes it possible to shorten the cutting time as compared with the conventional structure in which the bracket is manufactured by cutting almost the entire surface of the aluminum alloy material. Therefore, it is possible to provide a vibration isolator that is excellent in productivity and useful for weight reduction.

  In the above embodiment, the other end portion 14B of the clamping plate 14 is superposed on the one end surface portion 44A1 provided with the second bolt insertion hole 52 and the third bolt insertion hole 54 of the bracket body 44. However, it may be superposed on one end surface portion 44A1 provided with all the first to third bolt insertion holes 50, 52, 54, and any one bolt insertion hole is provided. Alternatively, only one end surface portion 44A1 may be superposed.

The perspective view of the vibration isolator which concerns on one Embodiment of this invention (The rubber-like elastic body of a vibration proof bush is abbreviate | omitting illustration). The perspective view seen from the other direction of the vibration isolator (the rubber-like elastic body of the vibration isolating bush is not shown). The top view of the vibration isolator. The front view of the vibration isolator. The side view of the vibration isolator. The perspective view of the bracket which comprises the vibration isolator. The top view of the bracket. The front view of the bracket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine side to-be-attached surface 10 ... Connecting rod 12 ... Bracket 14 ... Clamping plate, 14A ... End part on the vertical plate part side, 14B ... End part 16 on the side of the horizontal plate part ... Arm, 16A ... One end part, 16B ... The other end 18 ... the first vibration isolating bush 20 ... the second anti-vibration bush 20A ... the center 34 ... the inner cylinder 44 of the second anti-vibration bush ... the bracket body 44A ... the one end surface in the height direction, 44A1 ... the one end surface portion , 44B ... the other end surface in the height direction, 44C ... one side surface in the width direction, 44C1 ... one side surface portion 46 ... the projecting portions 50, 52, 54 ... the bolt insertion hole 56 ... the first mounting bolt 58 ... the receiving surface 60 ... the first. 2 mounting bolt 62 ... female screw part 64 ... horizontal plate part 66 ... vertical plate part A1 ... axis of first vibration isolation bush, A2 ... axis D of second vibration isolation bush ... width dimension, H ... height dimension L ... first Straight line S connecting the bolt insertion hole and the second bolt insertion hole , T ... width direction, U ... first direction X ... vehicle longitudinal direction (the longitudinal direction of the arm)
Y1 ... one side in the axial direction, Y2 ... the other side in the axial direction

Claims (3)

An anti-vibration device 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;
A clamping plate that clamps the second anti-vibration bush together with the bracket,
The bracket includes a bracket body having a height dimension larger than the width dimension and having an elongated block shape in a first direction orthogonal to the height dimension and the width dimension, and the bracket body includes a bracket body in the height direction of the bracket body. A plurality of first bolt insertion holes are provided at intervals in the first direction, and are inserted into the plurality of bolt insertion holes separately from one end surface side in the height direction of the bracket body. The other end surface in the height direction of the bracket body can be attached to the mounted surface on the engine side with a mounting bolt,
A protrusion that protrudes in the width direction from one side surface of the bracket body in the width direction is provided, and a receiving surface that receives the inner cylinder of the second vibration-proof bushing is provided on the top surface of the protrusion. An internal thread portion into which the second mounting bolt is screwed to the receiving surface is provided,
The sandwiching plate has an L-shape including a horizontal plate portion extending in the width direction from the bracket body and a vertical plate portion extending in the height direction from a tip of the horizontal plate portion, and is disposed on the vertical plate portion side. An end portion sandwiches the inner cylinder in the axial direction between the receiving surface by screwing the second mounting bolt inserted into the inner cylinder of the second vibration-proof bushing into the female thread portion; An end portion on the side of the horizontal plate portion is superposed on one end surface portion provided with one or a plurality of the bolt insertion holes in the one end surface of the bracket body, and the attached surface by the first attaching bolt An anti-vibration device configured to be fixed to the one end surface portion by being fastened. The first vibration isolation bush and the second vibration isolation bush are provided such that planes perpendicular to the respective axes are orthogonal to each other, and the axis of the first vibration isolation bush is in the axial direction of the second vibration isolation bush. Arranged at a position shifted to one side in the axial direction with respect to the center,
The bracket is arranged such that the first direction is along the longitudinal direction of the arm, and the plurality of bolt insertion holes are arranged in order from the side closer to the first vibration isolation bushing, the first bolt insertion hole, As a bolt insertion hole and a third bolt insertion hole, an interval between the first bolt insertion hole and the second bolt insertion hole is an interval between the second bolt insertion hole and the third bolt insertion hole. And the protruding portion protrudes from one side surface portion located between the first bolt insertion hole and the second bolt insertion hole in one side surface of the bracket body in the width direction. Has been established,
The end portion of the clamping plate on the side of the horizontal plate portion is superposed on one end surface portion provided with the second bolt insertion hole and the third bolt insertion hole in the one end surface of the bracket body. And is configured to be fixed to the one end surface portion by fastening to the mounted surface by the first mounting bolt,
2. The prevention according to claim 1, wherein the third bolt insertion hole is provided at a position shifted from the straight line connecting the first bolt insertion hole and the second bolt insertion hole to the other side in the axial direction. Shaker.   The bracket is formed by integrally casting the bracket body and the projecting portion with an aluminum alloy, and is fastened to at least the first mounting bolt of the one end surface of the bracket body in the height direction. The vibration isolator according to claim 1 or 2, wherein the end surface portion, the other end surface in the height direction, and the receiving surface provided on the top surface of the protruding portion are formed by cutting.

Images