JP2009014080A - Vibration absorbing device - Google Patents

Abstract

An anti-vibration performance is improved by increasing a natural frequency of a bracket on an engine side.
A first bracket 20 for mounting a vibration isolator main body 18 on the engine side is projected from a bracket main body 44 extending along a first direction Y and one side surface 44A in the width direction thereof. It consists of a cylindrical holding part 46 into which the main body 18 is press-fitted. The bracket main body 44 is L-shaped in plan view, and bolt insertion holes 56, 58, 60 are provided in the end portion 50A of the main body portion 50, the bent portion 52, and the tip end portion 54A of the extending portion 54, respectively, and mounting bolts. The lower surface 44B of the bracket body is configured to be attachable to the mounting surface 2A of the engine. The upper surface 44C of the bracket main body is provided with a raised portion 64 which is raised from the extending portion 54 around the bent portion 52 of the main body portion 50 with respect to the seating surfaces 58A and 60A for receiving the head portion 62A of the mounting bolt.
[Selection] Figure 1

Description

  The present invention relates to a vibration isolator that is mainly used for vibration-proofing a vibration body such as an automobile engine.

  An anti-vibration device is provided between the vehicle body and the engine that is the vibration source in order to suppress transmission of vibration to the vehicle body side. In such an anti-vibration device, a bracket is interposed between the anti-vibration device body and the engine in order to connect the anti-vibration device body having an anti-vibration base made of a rubber-like elastic body to the engine. A bracket structure has been proposed (see, for example, Patent Documents 1 to 3 below).

  Further, as this type of vibration isolator, a lower fixture attached to the vehicle body side, a cylindrical upper fixture attached to the engine side, and a vibration isolating base made of a rubber-like elastic body connecting both fixtures, The vibration isolator main body is attached to the vehicle body side via an inverted U-shaped vehicle body side bracket that straddles the vibration isolator body, and the engine side bracket projects laterally from the vehicle body side bracket. A so-called inverted type vibration isolator configured to attach the upper fixture to the engine side is known (see Patent Documents 4 and 5 below).

In addition, the bracket interposed between the vibration isolator body and the engine constitutes a stopper mechanism for restricting excessive relative displacement of the upper fixture relative to the lower fixture, and the bracket is provided with a stopper rubber member. (See Patent Documents 2 and 5). Conventionally, such a stopper rubber member is vulcanized and molded integrally with the bracket, or is simply mounted on the bracket after the stopper rubber member is vulcanized and molded alone.
JP 2004-028184 A JP 2000-220686 A Japanese Patent Laid-Open No. 11-0511117 JP 2006-083907 A Japanese Patent Laying-Open No. 2005-083461

  In the above-described vibration isolator, in order to exhibit excellent vibration isolating performance, it is required to increase the natural frequency of the engine side bracket, and the required performance has been increasingly increased in recent years.

  Accordingly, a first object of the present invention is to increase the natural frequency of the bracket on the engine side to improve the vibration isolation performance.

  As described above, in the case where the stopper rubber member is integrally provided on the bracket on the engine side by vulcanization molding, the larger the shape of the bracket, the larger the vulcanization molding die, which causes an increase in cost. On the other hand, in a configuration in which the stopper rubber member is simply put on the bracket, the stopper rubber member may fall off or be displaced, and a desired stopper function may not be exhibited.

  Therefore, a second object of the present invention is to provide a vibration isolator capable of securely fixing a stopper rubber member to a bracket on the engine side at a low cost.

  The vibration isolator according to the present invention that solves the first problem includes a lower attachment that is attached to the support, a cylindrical upper attachment that is attached to the vibration source, and the lower attachment and the upper attachment. A vibration isolator main body including a vibration isolating base made of a rubber-like elastic body for connecting the tool, and a first bracket for attaching the vibration isolator main body to the vibration source side. The first bracket protrudes from a side of the vibration isolator main body extending along a first direction perpendicular to the axial direction of the vibration isolator main body and one side surface of the bracket main body in the width direction. Then, the upper attachment tool is press-fitted in the axial direction to form a cylindrical holding portion that holds the vibration isolator main body. In addition, the bracket body is formed in an L shape in plan view by including an extending portion extending in a direction away from the vibration isolator body from the body portion extending along the first direction via a bent portion. The first bolt insertion hole along the axial direction is provided at the end of the main body opposite to the bent portion, and the second bolt insertion hole along the axial direction is provided at the bent portion. A third bolt insertion hole extending along the axial direction at the distal end of the extending portion, and a mounting bolt inserted through the first, second and third bolt insertion holes. The lower surface of the bracket body can be attached to the attached surface on the vibration source side. The upper surface of the bracket main body is provided with a raised portion that is raised from the extending portion to the periphery of the bent portion of the main body portion with respect to the seat surface that receives the head of the mounting bolt. .

  According to the above configuration, the bracket body is supported on the vibration source side by the mounting bolts at the three points of the both ends of the bracket body having an L shape in plan view and the bent portion therebetween, and then extended on the upper surface of the bracket body. Since the raised portion is provided around the bent portion of the main body portion from the installation portion and built up, the rigidity of the portion of the base portion of the cylindrical holding portion where the bending stress tends to concentrate can be increased. In addition, since the raised portion is provided limitedly around the bent portion of the main body portion from the extended portion, an increase in the weight of the first bracket can be avoided as much as possible, and thus the natural frequency of the first bracket can be reduced. Can be effectively increased.

  In the vibration isolator of the present invention, the vibration isolator main body includes a second bracket for attaching the vibration isolator main body to the support side, and the second bracket includes a fastening surface portion to which a lower end of the lower fixture is fixed; A pair of support-side fixing portions that are positioned on both sides of the fastening surface portion and are fixed to the support side, and both sides of the anti-vibration device body sandwiching the anti-vibration device body from above each support-side fixing portion A pair of vertical wall portions provided on the vibration isolator main body, and an upper wall portion that connects upper ends of the pair of vertical wall portions above the vibration isolator body. A stopper rubber member is attached to a cylindrical holding portion that holds the vibration isolator main body, and the stopper rubber member is provided so as to cover an upper surface of the vibration isolator main body, and is opposed to the upper wall portion. A first stopper rubber portion that limits relative displacement in the axial direction of the upper fixture, and extends downward from an edge of the first stopper rubber portion, and faces the pair of vertical wall portions, respectively. A second stopper rubber portion that restricts relative displacement of the fixture in the first direction, and a fixing rubber piece extends radially inward at a lower end of the second stopper rubber portion, The stopper rubber member is held in the cylindrical shape by sandwiching the rubber piece between the flange portion provided at the lower end of the upper fixture and the lower end of the cylindrical holding portion arranged on the flange portion. It may be fixed to the part.

  In this way, the stopper rubber member is provided with a fixing rubber piece, and the rubber piece is sandwiched between the flange portion of the upper fixture and the lower end of the cylindrical holding portion superimposed on the flange portion, thereby providing a stopper rubber member. Since the stopper rubber member can be securely fixed without falling off or misaligned, the desired stopper function can be exhibited. In addition, since it is not integrally vulcanized with the bracket, manufacturing cost can be reduced even when the bracket shape is large.

  In the above configuration, the first stopper rubber portion is provided with a plurality of stopper protrusions extending in a direction orthogonal to the radial direction at two locations facing the radial direction across the axis of the vibration isolator body, The stopper convex portion may include a first stopper convex portion on the radially outer side and a second stopper convex portion arranged in parallel on the radial inner side of the first stopper convex portion. In this case, the second stopper protrusion may be formed longer than the first stopper protrusion. In addition, the top surface of the first stopper convex portion may be formed in an inclined surface shape that is higher toward the inner side in the radial direction, and the top surface of the second stopper convex portion may be formed in an inclined surface shape that is higher toward the outer side in the radial direction. By providing such a stopper convex portion, it is possible to effectively suppress the hitting sound when the displacement of the first stopper rubber portion against the upper wall portion of the second bracket is restricted.

  As described above, with the vibration isolator of the present invention, the natural frequency of the first bracket provided on the engine side can be effectively increased, and the vibration isolation performance can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a vibration isolator 10 according to an embodiment of the present invention. The vibration isolator 10 is an engine mount for supporting an automobile engine with respect to a vehicle body, and is attached to a lower attachment 12 attached to a vehicle body 1 side as a support and an engine 2 side as a vibration source. An anti-vibration device body 18 having a cylindrical upper attachment 14, an anti-vibration base body 16 made of a rubber-like elastic body connecting them, and a first bracket for attaching the anti-vibration device body 18 to the engine 2 side 20 and a second bracket 22 for attaching the vibration isolator main body 18 to the vehicle body 1 side.

  As shown in FIGS. 3 and 4, the lower fixture 12 is a cylindrical metal fitting disposed below the axial core portion of the upper fixture 14, and has a female screw portion 24 that opens downward. The upper fixture 14 is a stepped cylindrical metal fitting with the axis O oriented in the vertical direction, and an outward flange portion 26 is extended at the lower end. The anti-vibration base 16 is vulcanized and bonded to the outer peripheral surface of the lower fixture 12 and the inner peripheral surface of the upper fixture 14, and gradually decreases in diameter from the upper fixture 14 toward the lower fixture 12. It is formed in a truncated cone shape.

  A diaphragm 30 made of a rubber-like elastic film that forms a liquid sealing chamber 28 between the upper fixture 14 and the antivibration base 16 is attached. The liquid enclosure chamber 28 is partitioned by a partition 32 into a first liquid chamber 28A on the vibration-isolating base 16 side and a second liquid chamber 28B on the diaphragm 30 side, and both liquid chambers 28A and 28B are liquid channels. Communication is made through an orifice 34. The partition body 32 is provided inside the peripheral wall portion of the upper fixture 14 and has an annular orifice forming member 36 that forms the orifice 34 on the outer peripheral side, and the first liquid chamber 28A and the second liquid inside the orifice forming member 36. An elastic partition film 38 made of a rubber film for partitioning the chamber 28B in the axial direction X, and a pair of upper and lower lattice-shaped displacement regulating means 40, 42 for regulating the amount of displacement of the elastic partition film 38 from both sides of the film surface. It becomes. The upper displacement regulating means 40 is integrally provided on the inner peripheral surface of the orifice forming member 36.

  The first bracket 20 is a cast product of an aluminum alloy, and a bracket main body 44 extending along a first direction Y perpendicular to the axial direction X of the vibration isolator main body 18 on the side of the vibration isolator main body 18. A cylindrical shape that integrally projects from one side surface 44A of the bracket body 44 in the width direction W (see FIG. 7) and holds the vibration isolator body 18 by press-fitting the upper fixture 14 in the axial direction X. And holding unit 46. In this example, the first direction Y faces the vehicle front-rear direction.

  The cylindrical holding portion 46 is formed so as to project from a substantially half region on the lower side thereof on the side surface 44A of the bracket main body 44 facing the vibration isolator main body 18. The cylindrical holder 46 has a short cylindrical shape that is coaxial with the upper fixture 14, and as shown in FIG. 3, the upper end 46 </ b> A protrudes higher than the upper end opening surface of the upper fixture 14. The dimension is set. Further, as shown in FIG. 5, the cylindrical holding part 46 is a notch part that is notched in a concave shape from above in the axial direction X in a circumferential part 46 </ b> B on the tip side located on the opposite side of the bracket body 44. 48 is provided, so that the width in the axial direction X of the circumferential portion 46B is narrow.

  The bracket main body 44 includes an extending portion 54 that extends in the direction P away from the vibration isolator main body 18 from the elongated block-shaped main body portion 50 extending along the first direction Y via the bent portion 52, as shown in FIG. As shown, it is formed in an L shape in plan view. In this example, the bent portion 52 has an obtuse angle. Therefore, the extended portion 54 extends in an inclined direction P away from the vibration isolator main body 18 with respect to the main body portion 50. The length of the extending portion 54 is set to be shorter than that of the main body portion 50, and in this example, is set to be approximately half the length of the main body portion 50.

  As shown in FIGS. 5 to 9, a first bolt penetrating vertically along the axial direction X is formed at one end of the bracket main body 44, that is, at the end 50 </ b> A opposite to the bent portion 52 of the main body 50. An insertion hole 56 is provided. Further, the bent portion 52 is provided with a second bolt insertion hole 58 penetrating vertically along the axial direction X. Further, a third bolt insertion hole 60 penetrating vertically along the axial direction X is provided at the distal end portion 54 </ b> A of the extending portion 54 which is the other end portion of the bracket body 44. The lower surface 44B of the bracket main body 44 can be attached to the mounting surface 2A on the engine 2 side by mounting bolts 62 inserted through the bolt insertion holes 56, 58 and 60, respectively (see FIG. 3).

  As shown in FIG. 5, a raised portion 64 is provided on the upper surface 44 </ b> C of the bracket main body 44 so as to be limited from the extending portion 54 to around the bent portion 52 of the main body portion 50. The raised portion 64 is provided in a raised shape with respect to the seat surface 58A around the second bolt insertion hole 58 and the seat surface 60A around the third bolt insertion hole 60 that receives the head portion 62A of the mounting bolt 62. ing.

  Specifically, the raised portion 64 includes a first raised portion 64A located between the seat surface 60A of the third bolt insertion hole 60 and the seat surface 58A of the second bolt insertion hole 58 in the extended portion 54; The main body portion 50 includes a second raised portion 64B located in the vicinity of the bent portion 52 and a third raised portion 64C that connects the first raised portion 64A and the second raised portion 64B, and a seat for the second bolt insertion hole 58. The surface 58A is provided so as to surround the inside of the bend. In the main body portion 50, a raised portion is not provided in a substantially half region on the end portion 50A side. The raised portion 64 is formed at a certain height. Further, the second raised portion 64B is provided with a groove 66 extending in the first direction Y at the center in the width direction W in order to reduce the weight and prevent the lack of thickness during casting.

  In FIG. 6, reference numeral 68 denotes a meat stealing recess provided on the lower surface side of the base portion 46 </ b> D with respect to the bracket main body 44 of the cylindrical holding portion 46 for weight reduction.

  The second bracket 22 is a cast product of an aluminum alloy, and as shown in FIGS. 1 to 4, a fastening surface portion 70 to which the lower end 12 </ b> A of the lower fixture 12 is fixed, and the fastening surface portion 70 in the first direction. A pair of vehicle body side fixing portions 72, 72 that are positioned on both sides opposite to Y and fixed to the vehicle body 1 side, rise from the vehicle body side fixing portions 72, 72 upward X1, and sandwich the anti-vibration device body 18 therebetween. A pair of vertical wall portions 74, 74 provided on both sides, and an upper wall portion 76 for connecting the upper ends 74A, 74A of the pair of vertical wall portions 74, 74 in the upper X1 of the vibration isolator main body 18 are provided as a whole. It has a square shape.

  The fastening surface portion 70 is provided with a bolt insertion hole 78 penetrating in the axial direction X, and a bolt 80 is inserted from below the bolt insertion hole 78 to be screwed into the female screw portion 24 of the lower fixture 12. By doing so, the lower end 12 </ b> A of the lower fixture 12 is fixed to the fastening surface portion 70.

  As for the pair of vehicle body side fixing portions 72, 72, two bolt holes 82 penetrating in the axial direction X are provided in one of them, and one bolt hole 82 is provided in the other, and the bolt 83 is inserted. Thus, it is fastened and fixed to the vehicle body 1 side.

  The vertical wall portion 74 is a portion for exerting a stopper action in the vehicle front-rear direction (first direction Y) between the opposite side walls of the cylindrical holding portion 46. Moreover, the upper wall part 76 is a site | part which exhibits the stopper effect | action which restrict | limits the relative displacement to a rebound direction between the upper ends of the cylindrical holding | maintenance part 46 which opposes.

  A stopper rubber member 84 is attached to the outside of the cylindrical holding portion 46 that holds the vibration isolator body 18. The stopper rubber member 84 covers a first stopper rubber portion 86 provided so as to cover the upper portion of the vibration isolator main body 18 including the upper end 46A of the cylindrical holding portion 46, and a pair of front and rear side portions of the cylindrical holding portion 46. And a pair of second stopper rubber portions 88, 88 provided as described above.

  The first stopper rubber portion 86 is a stopper rubber portion that is disposed to face the upper wall portion 76 of the second bracket 22 and restricts the relative displacement of the upper fixture 14 in the upper direction X1, and is shown in FIGS. Thus, a flat plate shape is formed, and a circular opening 90 is provided at the center.

  The first stopper rubber portion 86 extends in a direction L orthogonal to the radial direction K at two locations facing the radial direction K (here, the first direction Y) across the axis O of the vibration isolator body 18. A plurality of stopper projections 92 are provided. The stopper convex portions 92 are provided at both end portions in the first direction Y of the first stopper rubber portion 86. More specifically, the stopper convex portions 92 are provided at portions covering the upper end 46A of the cylindrical holding portion 46, and when rebounding, It is configured to be compressed between the upper end 46 </ b> A of the cylindrical holding portion 46 and the upper wall portion 76 of the second bracket 22.

  As shown in FIG. 12, the stopper convex portion 92 is juxtaposed on the radially inner side of the two first stopper convex portions 92A and 92A having a rectangular shape in plan view and located on the radially outer side, and the first stopper convex portion 92A. It is composed of two second stopper projections 92B and 92B having a rectangular shape in plan view. The second stopper protrusion 92B is formed to be longer in the direction L than the first stopper protrusion 92A. Thus, by setting the outer first stopper protrusion 92A to be shorter and the second stopper protrusion 92B adjacent to the inner side to be longer, a part of the upper end 46A forming the circular arc shape of the cylindrical holding part 46 and the upper side The stopper convex portion 92 is uniformly collided and compressed between the wall portion 76 and an excellent noise preventing effect is exhibited.

  As shown in FIG. 13, the first stopper convex portion 92A has a top surface 92A1 formed in an inclined surface shape that is higher toward the radially inner side K1, and the second stopper convex portion 92B has a top surface 92B1 formed in the radial direction. The outer side K2 is formed in a higher inclined surface shape. Thereby, the impact at the time of the collision with respect to the upper wall part 76 can be relieve | moderated effectively, and it is excellent in the hitting sound prevention effect.

  The second stopper rubber portion 88 is a stopper rubber portion that is disposed to face the pair of vertical wall portions 74, 74 of the second bracket 22, respectively, and restricts the relative displacement in the first direction Y of the upper fixture 14. The first stopper rubber portion 86 extends downward in the form of a vertical wall from the edge facing the radial direction K. As shown in FIGS. 10, 11, and 13, the second stopper rubber portion 88 is provided with a thick stopper convex portion 94 that protrudes in the first direction Y, and this stopper convex portion 94 serves as a vehicle deceleration. And it is comprised so that it may compress between the outer peripheral surface of the cylindrical holding | maintenance part 46, and the vertical wall part 74 of the 2nd bracket 22 at the time of acceleration.

  As shown in FIGS. 11 and 13, a fixing rubber piece 96 extends radially inward at the lower end 88 </ b> A of the second stopper rubber portion 88. The fixing rubber pieces 96 are respectively provided at two left and right end portions of the lower end 88A of the pair of second stopper rubber portions 88, 88, and a total of four pieces are provided.

  The fixing rubber piece 96 is configured so as to be sandwiched between the flange portion 26 of the upper fixture 14 and the lower end 46C of the cylindrical holding portion 46 that is superposed on the flange portion 26. The stopper rubber member 84 is fixed to the cylindrical holding portion 46 by clamping.

  Specifically, as shown in FIG. 6, the lower end 46 </ b> C of the cylindrical holding portion 46 is provided with fixing concave portions 98 into which the fixing rubber pieces 96 are fitted at four locations in the circumferential direction. As shown in FIG. 14A, the stopper rubber member 84 is placed on the cylindrical holding portion 46 of the first bracket 20 so that each fixing rubber piece 96 of the stopper rubber member 84 is fitted into the corresponding fixing recess 98. . In this state, the vibration isolator main body 18 is press-fitted into the cylindrical holding portion 46 from below (see FIG. 14B).

  As a result, as shown in FIG. 15, the fixing rubber piece 96 is sandwiched between the flange portion 26 and the lower end 46 </ b> C of the cylindrical holding portion 46 in the fixing recess 98. The thickness T (see FIG. 13) of the fixing rubber piece 96 is preferably set larger than the depth U (see FIG. 15) of the fixing recess 98. By bringing the portion 26 and the lower end 46C of the cylindrical holding portion 46 into contact with each other without a gap, the fixing rubber piece 96 is held in a compressed state, and a high fixing effect is obtained.

  In the vibration isolator 10 of the present embodiment, when a large amplitude vibration occurs, the vibration is attenuated by the liquid flow effect by the orifice 34, and when a small amplitude high frequency vibration occurs, the partition body The low dynamic spring characteristic is exhibited by the reciprocating displacement of the 32 elastic partition films 38. Further, with respect to the impact sound caused by the collision of the elastic partition film 38 with the displacement restricting means 40, 42, vibration isolation is interposed between the upper fixture 14 provided with the partition 32 and the lower fixture 12 on the vehicle body 1 side. The vibration due to the collision is absorbed by the base body 16, and it is possible to suppress the hitting sound from being transmitted to the vehicle interior.

  Further, in the present embodiment, the base portion 46D of the cylindrical holding portion 46 in which bending stress is easily concentrated by providing the raised portion 64 limited to a part of the upper surface 44C of the bracket body 44 as described above. In this case, the rigidity of the portion can be effectively increased. Therefore, while avoiding an increase in the weight of the first bracket 20 as much as possible, the natural frequency can be shifted to a high frequency side that does not cause a problem in terms of vibration isolation, and the vibration isolation performance can be improved.

  In addition, since the stopper rubber member 84 is fixed by sandwiching the fixing rubber piece 96 provided on the stopper rubber member 84 between the upper fixture 14 and the first bracket 20, the manufacturing cost can be reduced. The stopper rubber member 84 can be securely fixed without falling off or misaligned, and a desired stopper function can be exhibited.

  FIG. 16 shows a modified example of the fixing configuration of the stopper rubber member 84. In this example, the recess bottom surface 98A is formed in an inclined surface so that the fixing recess 98 becomes deeper inward in the radial direction. By inclining the bottom surface 98 </ b> A of the fixing recess 98 in this way, the fixing rubber piece 96 is held when the fixing rubber piece 96 is sandwiched between the flange portion 26 and the lower end 46 </ b> C of the cylindrical holding portion 46. Escape to the outside in the radial direction can be prevented, and the fixing rubber piece 96 can be more reliably fixed.

The perspective view of the vibration isolator which concerns on one Embodiment. The perspective view seen from the lower surface side of the vibration isolator. III-III sectional view taken on the line of FIG. IV-IV sectional view taken on the line of FIG. The perspective view of the 1st bracket of the vibration isolator. The perspective view seen from the lower surface side of the 1st bracket. The top view of the bracket. The side view seen from the VIII direction of FIG. The rear view seen from the IX direction of FIG. The perspective view of the stopper rubber member of the vibration isolator. The perspective view seen from the lower surface side of the stopper rubber member. The top view of the stopper rubber member. The front view of the stopper rubber member. The perspective view which shows the assembly process of a vibration isolator apparatus main body and a 1st bracket. The principal part sectional drawing which shows the fixation structure of a stopper rubber member. The principal part sectional drawing which shows the example of a change of the fixing structure of a stopper rubber member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car body (support body), 2 ... Engine (vibration source), 2A ... Mounted surface 10 ... Anti-vibration device 12 ... Lower side fixture, 12A ... Lower end 14 ... Upper side fixture 16 ... Anti-vibration base 18 ... Anti-vibration base Device main body 20 ... first bracket 22 ... second bracket 26 ... flange portion 44 ... bracket main body 44A ... one side surface 44B ... lower surface 44C ... upper surface 46 ... cylindrical holding portion 46C ... lower end 50 ... main body portion 50A ... End 52 ... Bending portion 54 ... Extension portion 54A ... Tip 56 ... First bolt insertion hole 58 ... Second bolt insertion hole 58A ... Seat surface 60 ... Third bolt insertion hole 60A ... Seat surface 62 ... Installation Bolt 62A ... head 64 ... protruding portion 70 ... fastening surface portion 72 ... vehicle body side fixing portion 74 ... vertical wall portion 76 ... upper wall portion 84 ... stopper rubber member 86 ... first stopper rubber portion 88 ... second stopper rubber portion, 88A ... Lower end 92 ... Stopper projection, 9 A ... first stopper convex part, 92B ... second stopper convex part 96 ... fixing rubber piece K ... radial direction, L ... direction orthogonal to the radial direction O ... axial center X of the vibration isolator main body ... axial center direction, X1 ... Upward Y ... First direction

Claims (4)

An anti-vibration device comprising: a lower attachment attached to the support, a cylindrical upper attachment attached to the vibration source, and a vibration-proof base made of a rubber-like elastic body connecting the lower attachment and the upper attachment. A vibration device body,
A first bracket for attaching the vibration isolator main body to the vibration source side;
The first bracket protrudes from a side of the vibration isolator main body extending along a first direction perpendicular to the axial direction of the vibration isolator main body and one side surface of the bracket main body in the width direction. The upper fixture is made of a cylindrical holding portion that holds the vibration isolator main body by being press-fitted in the axial direction,
The bracket main body is formed in an L shape in plan view by including an extending portion extending in a direction away from the vibration isolator main body through a bent portion from a main body portion extending along the first direction,
A first bolt insertion hole along the axial direction is provided at an end of the main body portion opposite to the bent portion, and a second bolt insertion hole along the axial direction is provided at the bent portion. And a third bolt insertion hole provided along the axial direction at the distal end of the extending portion, and a mounting bolt inserted separately into the first, second and third bolt insertion holes. The lower surface of the bracket body is configured to be attachable to a mounting surface on the vibration source side,
The upper surface of the bracket body is provided with a raised portion that is raised from the extending portion to the seat surface that receives the head of the mounting bolt, limited to the periphery of the bent portion of the body portion.
Anti-vibration device. A second bracket for attaching the vibration isolator main body to the support side;
The second bracket includes a fastening surface portion to which a lower end of the lower fixture is fixed, a pair of support body side fixing portions positioned on both sides of the fastening surface portion and fixed to the support body side, and each support A pair of vertical wall portions provided on both sides of the anti-vibration device body with the anti-vibration device body sandwiched between the body-side fixing portion and the upper ends of the pair of vertical wall portions above the anti-vibration device body An upper wall portion to be connected,
A stopper rubber member is attached to the cylindrical holding portion holding the vibration isolator body,
The stopper rubber member is provided so as to cover an upper surface of the vibration isolator main body, and is opposed to the upper wall portion and restricts a relative displacement in the axial direction of the upper fixture, and A second stopper rubber portion that extends downward from an edge portion of the first stopper rubber portion and faces the pair of vertical wall portions to limit relative displacement of the upper fixture in the first direction. And
A fixing rubber piece extends radially inward at the lower end of the second stopper rubber portion, and the fixing rubber piece is overlapped with the flange portion provided at the lower end of the upper fixture and the flange portion. The stopper rubber member was fixed to the cylindrical holding part by sandwiching between the lower end of the cylindrical holding part,
The vibration isolator according to claim 1.   The first stopper rubber portion is provided with a plurality of stopper projections extending in a direction perpendicular to the radial direction at two locations facing each other in the radial direction across the axis of the vibration isolator main body. The portion includes a first stopper convex portion on the radially outer side and a second stopper convex portion that is arranged in parallel to the radial inner side of the first stopper convex portion and is longer than the first stopper convex portion. The anti-vibration device according to claim 2.   The first stopper rubber portion is provided with a plurality of stopper projections extending in a direction perpendicular to the radial direction at two locations facing each other in the radial direction across the axis of the vibration isolator main body. The portion is composed of a first stopper convex portion on the radially outer side and a second stopper convex portion arranged in parallel on the radial inner side of the first stopper convex portion, and the top surface of the first stopper convex portion is The anti-vibration device according to claim 2 or 3, wherein the inner side in the radial direction is formed in a higher inclined surface shape, and the top surface of the second stopper convex portion is formed in a higher inclined surface shape in the radial direction outer side.

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