JP2014185756A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device which inhibits damages of cushion rubber.SOLUTION: A vibration control device includes: a rod member where one end part is attached to one of a vibration generation part and a vibration receiving part; a cylindrical body provided at the outer periphery side of the other end part of the rod member and attached to the other of the vibration generation part and the vibration receiving part; a rubber elastic body which connects an inner peripheral surface of the cylindrical body with an outer peripheral surface of the rod member in an elastically deformable manner; a frame which is fixed to the outer peripheral surface of the cylindrical body and covers an axial end surface of the cylindrical body, the frame where an insertion hole into which the rod member is inserted is formed; and cushion rubber which is attached to the rod member and faces the insertion hole, the cushion rubber where a groove is formed in a portion facing a hole edge of the insertion hole.

Description

  The present invention relates to a vibration isolator.

  As a vibration isolator provided between the engine (vibration generating unit) and the vehicle body (vibration receiving unit), a rod-like member attached to one of the engine and the vehicle body, a cylinder attached to the other of the engine and the vehicle body, and a rod-like member And a rubber elastic body that connects the cylinder and the cylinder so as to be elastically deformable. In addition, there is a vibration isolator in which a frame having an insertion hole through which a rod-shaped member is inserted is formed on the outside of a cylindrical body, and the frame and the rod-shaped member are connected by a buffer rubber (for example, Patent Document 1).

  However, each time the rod-shaped member moves relative to the frame, the shock-absorbing rubber connected to the rod-shaped member is deformed and repeatedly contacts the hole edge of the insertion hole, which may damage the shock-absorbing rubber.

JP 7-252447 A

  An object of the present invention is to provide a vibration isolator which suppresses damage to a buffer rubber in consideration of the above matters.

  The vibration isolator according to claim 1, wherein one end portion is provided on the outer peripheral side of the other end portion of the rod-shaped member and the rod-shaped member attached to one of the vibration generating portion and the vibration receiving portion, and generates vibration. A cylindrical body attached to either the first part or the vibration receiving part, a rubber elastic body that connects the inner peripheral surface of the cylindrical body and the outer peripheral surface of the rod-shaped member so as to be elastically deformable, and an outer peripheral surface of the cylindrical body A fixed frame that covers the axial end surface of the cylindrical body and has an insertion hole through which the rod-shaped member is inserted; and a frame that is attached to the rod-shaped member and faces the insertion hole; and a hole edge of the insertion hole And a shock-absorbing rubber having a groove formed in a portion facing the surface.

  In the vibration isolator according to the first aspect, one end of the rod-like member is attached to one of the vibration generating unit and the vibration receiving unit. Moreover, the cylinder attached to either one of a vibration generation part and a vibration receiving part is provided in the outer peripheral side of the other end part of a rod-shaped member. Furthermore, the inner peripheral surface of the cylindrical body and the outer peripheral surface of the rod-like member are connected by a rubber elastic body so as to be elastically deformable. For this reason, when vibration is input from the vibration generating unit to the vibration isolator, the rubber elastic body is elastically deformed to attenuate and absorb the vibration.

  In addition, a frame that covers an end surface of the cylindrical body in the axial direction is fixed to the outer peripheral surface of the cylindrical body, and an insertion hole through which the rod-shaped member is inserted is formed in the frame. Further, a shock-absorbing rubber is attached to the rod-shaped member so as to face the insertion hole, and a groove portion is formed in a portion facing the hole edge of the insertion hole of the shock-absorbing rubber. Thereby, even if the rod-shaped member moves relative to the frame, the hole edge of the insertion hole and the buffer rubber are less likely to contact each other, and the buffer rubber can be prevented from being damaged.

  A vibration isolator according to claim 2 is the vibration isolator according to claim 1, wherein the groove is an annular groove.

  In the vibration isolator according to claim 2, the groove portion is formed in an annular shape. Thereby, a hole edge and a buffer rubber become difficult to contact over the perimeter of an insertion hole.

  The vibration isolator according to claim 3 is the vibration isolator according to claim 1, wherein the groove is formed intermittently along a hole edge of the insertion hole.

  In the vibration isolator according to the third aspect, the groove is intermittently formed along the hole edge of the insertion hole. Thereby, compared with the case where the cyclic | annular groove part is formed, the rigidity of the whole buffer rubber is securable.

  The anti-vibration device according to claim 4 is the anti-vibration device according to any one of claims 1 to 3, wherein the anti-vibration device projects radially from the outer peripheral surface of the rod-shaped member inside the frame. In addition, a stopper covered with the buffer rubber is formed.

  In the vibration isolator according to the fourth aspect, a stopper projecting in the radial direction from the outer peripheral surface of the rod-shaped member and covered with a buffer rubber is formed inside the frame. As a result, when a vibration having a large amplitude is input from the vibration generating portion, the rubber elastic body tends to be greatly elastically deformed, but the stopper covered with the buffer rubber comes into contact with the frame, and the rubber elastic body is elastically deformed. Since it regulates, deterioration of the rubber elastic body can be suppressed.

  The vibration isolator according to claim 5 is the vibration isolator according to any one of claims 1 to 4, wherein the frame includes an upper wall in which the insertion hole is formed, and the upper wall. And a peripheral wall that is integrally formed and connected to the cylindrical body, and the buffer rubber is a rubber plate provided on the upper surface of the upper wall.

  In the vibration isolator according to the fifth aspect, the frame is constituted by the upper wall in which the insertion hole is formed and the peripheral wall formed integrally with the upper wall. Thereby, even if a vibration with a large amplitude is input, the elastic deformation of the rubber elastic body can be reliably controlled. Further, a rubber plate is provided on the upper surface of the upper wall, and members outside the frame do not directly contact the frame, so that abnormal noise can be suppressed.

  An anti-vibration device according to claim 6 is the anti-vibration device according to claim 1, wherein the buffer rubber is attached to the rod-like member so as to face a hole wall of the insertion hole. And an annular groove formed on the outer peripheral surface of the cylindrical portion facing the hole edge of the insertion hole.

  In the vibration isolator according to claim 6, the shock absorbing rubber includes a cylindrical portion attached to the rod-like member so as to face the hole wall of the insertion hole, and the outer peripheral surface of the cylindrical portion has an insertion hole. A buffer groove is formed in a portion facing the hole edge. Thereby, it becomes difficult to contact the hole edge of the insertion hole and the cylindrical portion, and the shock absorbing rubber can be prevented from being damaged.

  Since this invention set it as said structure, it can provide the vibration isolator which suppresses that a buffer rubber is damaged.

It is a perspective view of the vibration isolator which concerns on 1st Embodiment of this invention. It is sectional drawing of the vibration isolator which concerns on 1st Embodiment of this invention. It is a principal part expanded sectional view for demonstrating the currant which concerns on 1st Embodiment of this invention. It is a top view which shows the shock absorbing rubber which concerns on 1st Embodiment of this invention. It is a principal part expanded sectional view which shows the state which the attachment metal fitting which concerns on 1st Embodiment of this invention is moving below. It is a principal part expanded section which shows the state which the attachment metal fitting which concerns on 1st Embodiment of this invention moves upwards, and the stopper and the flame | frame are contacting. It is a top view which shows the rubber plate which concerns on 2nd Embodiment of this invention. It is sectional drawing of the vibration isolator which concerns on 3rd Embodiment of this invention.

(First embodiment)
The vibration isolator 10 according to the first embodiment of the present invention will be described with reference to the drawings. In the following description, the center axis of the vibration isolator 10 is described as CL.

  An anti-vibration device 10 according to the present embodiment is an anti-vibration device 10 used as an engine mount that is attached between an engine as a vibration generating unit and a vehicle body as a vibration receiving unit. A connection arm 100 and a stay 102 for connecting the vibration isolator 10 and an engine (not shown) are provided on the top of the vibration isolator 10. The connecting arm 100 is a horizontally extending plate-like member, and one end of the connecting arm 100 is screwed to a mounting bracket 12 as a rod-like member constituting the vibration isolator 10 by a hexagon bolt 104. (See FIG. 2). The other end of the connecting arm 100 is fixed to the engine with a hexagon bolt or the like.

  The stay 102 is a metal plate-like member whose one end is welded to the frame 18 positioned at the upper portion of the vibration isolator 10, and the other end of the stay 102 is a curved portion that is curved to the outside of the vibration isolator 10. 102A. The curved portion 102A is formed with a through hole 102B, and a hexagon bolt or the like is inserted into the through hole 102B to connect the stay 102 and the engine.

  A cylindrical fixing member 106 is attached to the lower part of the vibration isolator 10, and two legs 108 are welded to the outer peripheral surface of the fixing member 106 so as to sandwich the fixing member 106 from both sides. The leg portion 108 is fixed to a vehicle body (not shown) with a hexagon bolt or the like, and the vibration isolator 10 and the vehicle body are connected. In this way, the vibration isolator 10 is attached between the vehicle body and the engine.

  As shown in FIG. 2, the vibration isolator 10 mainly includes a mounting bracket 12 to which the connecting arm 100 is attached, and a cylindrical body 14 that is located at the lower part of the vibration isolator 10 and is provided on the outer peripheral side of the mounting bracket 12. A rubber elastic body 16 that connects the mounting bracket 12 and the cylindrical body 14 so as to be elastically deformable, a frame 18 that is fixed to the outer peripheral surface of the cylindrical body 14 and surrounds the rubber elastic body 16, and an upper surface of the frame 18. And a rubber plate 20 as a buffer rubber.

  The mounting bracket 12 is a rod-shaped member made of metal such as steel, and extends vertically along the central axis CL of the vibration isolator 10. An opening 12A is formed at one end of the mounting bracket 12 in the axial direction, and a female screw portion 12B is formed in the mounting bracket 12 from the opening 12A in the axial direction. Here, the connecting arm 100 is attached to the mounting bracket 12 by inserting the hexagon bolt 104 inserted into the through hole 100A of the connecting arm 100 into the female screw portion 12B and screwing it.

  A stopper 13 protruding in the radial direction from the outer peripheral surface of the mounting bracket 12 is formed at an intermediate portion in the axial direction of the mounting bracket 12. The stopper 13 protrudes in all directions around the central axis CL, and is formed with a length that does not contact the frame 18. The stopper 13 is covered with a covering rubber 17 described later. The stopper 13 may be an annular protrusion having a circular cross section.

  A cylindrical body 14 made of a metal such as steel is provided on the outer peripheral side of the other end of the mounting bracket 12. The cylindrical body 14 is a thin cylindrical body that is provided coaxially with the mounting bracket 12 and is open at both ends, and has a large-diameter cylindrical portion 22A positioned above a step portion 22 formed in an intermediate portion in the axial direction. It is located below the step portion 22 and is composed of a small diameter cylindrical portion 22B having a smaller diameter than the large diameter cylindrical portion 22A.

  A rubber elastic body 16 is vulcanized and bonded to the inner peripheral surface of the large-diameter cylindrical portion 22A and the outer peripheral surface of the mounting bracket 12. The rubber elastic body 16 is formed of natural rubber or the like, and connects the cylindrical body 14 and the mounting bracket 12 so as to be elastically deformable. The rubber elastic body 16 extends from the lower end of the mounting bracket 12 in the axial direction and is connected to a covering rubber 17 that covers the stopper.

  A thin cylindrical thin rubber 24 extending downward from the lower end of the rubber elastic body 16 is vulcanized and bonded to the inner peripheral surface of the small diameter cylindrical portion 22B. The annular orifice forming metal fitting 26 is fitted. Further, the lower end portion of the small diameter cylindrical portion 22 is crimped radially inward.

  The orifice forming metal fitting 26 constitutes an upper surface and an inner peripheral surface of the orifice forming metal fitting 26, a first metal fitting 26A having a reverse L-shaped cross section, and a second metal fitting 26B constituting the outer peripheral surface and the lower surface of the orifice forming metal fitting 26. A disc-shaped membrane rubber 28 formed of natural rubber or the like is vulcanized and bonded to the first metal fitting 26A that is the inner peripheral surface of the orifice forming metal fitting 26 over the entire circumference. Yes. Thereby, the main liquid chamber 30 surrounded by the first metal fitting 26A, the membrane rubber 28, and the rubber elastic body 16 is formed.

  Below the membrane rubber 28 is provided a hat-shaped diaphragm rubber 32 having an open bottom. An extension portion 32A that is integrally formed with the diaphragm rubber 32 and extends upward is provided at the outer peripheral end portion of the diaphragm rubber 32, and the extension portion 32A is vulcanized and bonded to the second metal fitting 26B. ing. As a result, a sub liquid chamber 34 surrounded by the diaphragm rubber 32, the membrane rubber 28, and the extending portion 32A is formed.

  An orifice passage 36 surrounded by a first fitting 26A and a second fitting 26B is formed inside the orifice forming fitting 26, and one end side of the orifice passage 36 opens into the main liquid chamber 30; The other end side of the orifice passage 36 opens into the secondary liquid chamber 34 (the opening is not shown). For this reason, the main liquid chamber 30 and the sub liquid chamber 34 communicate with each other via the orifice passage 36. The main liquid chamber 30 and the sub liquid chamber 34 are filled with a liquid such as water or viscous oil.

  The cylindrical body 14 formed as described above is fixed to the peripheral wall 18B of the frame 18. The frame 18 covers the end face in the axial direction of the cylindrical body 14 and is formed so as to surround the stopper 13 and the covering rubber 17, and has a rectangular shape when viewed from the top provided at a position facing the upper surface of the stopper 13. The wall 18 </ b> A and a peripheral wall 18 </ b> B that extends downward from the outer peripheral end portions of the three sides of the upper wall 18 </ b> A and is fixed to the cylindrical body 14. A stay 102 is welded to the remaining one side of the upper wall 18A.

  A circular insertion hole 38 is formed in the central portion of the upper wall 18A, and the mounting bracket 12 is inserted into the insertion hole 38. A stepped portion 40 is formed slightly below the intermediate portion in the axial direction of the peripheral wall 18B, and the lower side of the stepped portion 40 of the peripheral wall 18B is formed in a cylindrical shape. The cylindrical body 14 is press-fitted and fixed to the cylindrical peripheral wall 18B from below. A fixing member 106 is welded to the outer peripheral surface of the peripheral wall 18B (see FIG. 1).

  A rubber plate 20 is vulcanized and bonded to the upper surface of the upper wall 18A at a position facing the insertion hole 38. The rubber plate 20 is a flat rubber material, and a through hole 42 is formed through the rubber plate 20 in the thickness direction (see FIG. 4). The mounting bracket 12 passes through the through hole 42, and the hole wall of the through hole 42 is vulcanized and bonded to the outer peripheral surface of the mounting bracket 12 to connect the rubber plate 20 and the mounting bracket 12.

  As shown in FIG. 3, on the back surface of the rubber body 20, a currant 20 </ b> A as a groove is formed in a portion facing the hole edge 38 </ b> A of the insertion hole 38 formed in the upper wall 18 </ b> A of the frame 18. The currant 20A has a semicircular cross section, and is formed in an annular shape by hollowing out the surface of the rubber plate 20, as shown in FIG. The depth of the currant 20A is slightly shallower than half of the thickness of the rubber plate 20, and the width of the currant 20A is about twice the depth. Furthermore, the peripheral part of the currant 20A has an R shape without corners.

  As shown in FIG. 3, the covering rubber 17 covering the upper surface of the stopper 13 is formed with a currant 17 </ b> A at a portion facing the hole edge 38 </ b> A of the insertion hole 38. Like the currant 20A of the rubber plate 20, the currant 17A has a semicircular cross section and is formed to a depth of about 1/4 of the covering rubber 17. Moreover, the peripheral part of the currant 17A has an R shape with no corners.

  In the present embodiment, a gap is provided between the covering rubber 17 that covers the upper surface of the stopper 13 and the outer peripheral surface of the mounting bracket 12, but the outer peripheral surface of the mounting bracket 12 is vulcanized without providing a gap. It may be glued. Further, the covering rubber 17 may be vulcanized and bonded to the mounting bracket 12 so as to protrude in the radial direction from the outer peripheral surface of the mounting bracket 12 without forming the stopper 13.

  Next, the operation of the vibration isolator 10 according to the present embodiment will be described. When the engine is operated, vibration generated from the engine is input to the mounting bracket 12 via the connecting arm 100 shown in FIG. 2, and the rubber elastic body 16 is elastically deformed. When the rubber elastic body 16 is elastically deformed, the vibration is attenuated and absorbed by the vibration damping function based on the internal friction of the rubber elastic body 16. Further, the main liquid chamber 30 expands and contracts due to the elastic deformation of the rubber elastic body 16. By expanding and contracting the main liquid chamber 30, the liquid flows between the main liquid chamber 30 and the sub liquid chamber 34 through the orifice passage 36. As a result, liquid injection resonance occurs in the orifice passage 36, and an anti-vibration effect is obtained.

  Here, when high-frequency vibration is input, the flow resistance in the orifice passage 36 increases and the orifice passage 36 is clogged, but the membrane rubber 28 is elastically deformed, and the main liquid chamber 30 and the sub liquid chamber 34. Suppresses fluctuations in internal pressure. As a result, even if high-frequency vibration occurs, the anti-vibration characteristics are maintained without being reduced, and the effect of the anti-vibration device 10 can be exhibited.

  Thus, when the mounting bracket 12 is moved relative to the frame by vibration from the engine, the rubber plate 20 vulcanized and bonded to the mounting bracket 12 is attached to the mounting bracket 12 as shown in FIGS. Deforms repeatedly with 12 relative movements. In the state of FIG. 5, as the mounting bracket 12 moves relative to the frame 18 downward, the central portion in the radial direction of the rubber plate 20 is deformed so as to bend downward. At this time, the rubber plate 20 is formed with a currant 20A at a portion facing the hole edge 38A of the insertion hole 38 formed in the upper wall 18A of the frame 18, so that the hole edge 38A and the rubber plate 20 are formed. It becomes difficult to contact and it can suppress that the rubber plate 20 is damaged.

  On the other hand, when an excessively large vibration is input from the engine and the mounting bracket 12 moves largely in the axial direction with respect to the frame 18, the stopper 13 contacts the upper wall 18A of the frame 18 as shown in FIG. By contacting, the relative movement of the mounting bracket 12 with respect to the frame 18 is limited. Thereby, it can control that rubber elastic body 16 changes greatly and deteriorates. Further, since the stopper 13 is covered with the covering rubber 17, no abnormal noise is generated even when it comes into contact with the upper wall 18A.

  Furthermore, since the cover rubber 17 is formed with the currants 17A, even if the cover rubber 17 and the upper wall 18A come into contact with each other, the hole edge 38A of the insertion hole 38 and the cover rubber 17 are difficult to contact with each other. It can suppress that 17 is damaged.

(Second Embodiment)
Next, the vibration isolator 50 according to the second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected about the structure same as 1st Embodiment, and description is abbreviate | omitted. The vibration isolator 50 according to the present embodiment is the same as the vibration isolator 10 according to the first embodiment shown in FIGS. 1 and 2 except for the rubber plate 52 that constitutes the vibration isolator 50. Here, as shown in FIG. 7, the outer shape of the rubber plate 52 is the same shape as the outer shape of the rubber plate 20 according to the first embodiment, and a through hole 54 penetrating in the thickness direction is formed.

  In addition, in a portion facing the hole edge 38A of the insertion hole 38 formed in the upper wall 18A of the frame 18, a currant 52A is intermittently formed along the hole edge 38A. In the present embodiment, eight currants 52A are formed at equal intervals along the hole edge 38A, but the spacing and the number of the currants 52A are not particularly limited. Furthermore, the depth and width of the currant 52A are formed with the same dimensions as the currant 20A formed on the rubber plate 20 according to the first embodiment.

  In the vibration isolator 50 according to the present embodiment, a decrease in the rigidity of the rubber plate 52 can be suppressed as compared with the case where the currant is continuously formed along the hole edge 38A. Thereby, the lifetime of the rubber plate 52 can be extended. Moreover, since the currants 17A are formed in the portion facing the hole edge 38A, the contact area between the hole edge 38A and the rubber plate 52 can be reduced, and damage to the rubber plate 52 can be suppressed.

(Third embodiment)
Next, a vibration isolator according to a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected about the structure same as 1st Embodiment, and description is abbreviate | omitted. As shown in FIG. 8, the vibration isolator 70 according to this embodiment includes a rod-shaped mounting bracket 72. The mounting bracket 72 is formed on the central axis CL of the vibration isolator 70, and the stopper 13 is not formed on the mounting bracket 72. A mounting hole 74 penetrating in the radial direction is formed in the upper part of the mounting bracket 72, and a connecting arm 100 connected to the engine is fixed.

  A cylindrical body 78 is formed on the outer peripheral side of the lower portion of the mounting bracket 72. The cylindrical body 78 is a member that is open at both ends in the axial direction, and a main liquid chamber 79 is formed in the lower portion of the cylindrical body 78. Further, the inner peripheral surface of the cylindrical body 78 and the outer peripheral surface of the mounting bracket 72 are connected by a rubber elastic body 80 so as to be elastically deformable.

  An outer cylinder 84 is formed on the outer side of the cylinder body 78 through an extending portion 82A extending from a diaphragm rubber 82 formed below the cylinder body 78. The outer cylinder 84 is a cylindrical member having both ends in the axial direction opened like the cylinder 78, and a sub liquid chamber 85 is formed in the lower part of the outer cylinder 84. An orifice channel 87 is formed between the outer peripheral surface of the cylindrical body 78 and the inner peripheral surface of the outer tube 84, and the fluid in the main liquid chamber 79 and the sub liquid chamber 85 flows through the orifice channel 87. Circulate through each other.

  A frame 86 is formed outside the outer cylinder 84 so as to wrap around the outer peripheral surface of the outer cylinder 84. The frame 86 is a cylindrical member that is open at both ends in the axial direction. The upper end of the frame 86 is reduced in diameter so as to cover the upper end surface of the cylindrical body 78 and extends upward. An insertion hole 88 for insertion is formed. The lower end portion of the frame 86 is curved outward in the radial direction.

  A stopper rubber 90 is formed outside the frame 86 so as to surround the outer peripheral surface of the upper portion of the frame 86. The stopper rubber 90 is a reverse cup-shaped rubber body in which a through hole 92 is formed in the central portion in the radial direction, and has a thick adhesive portion 90A formed facing the hole wall of the insertion hole 88, and an adhesive portion. An extending portion 90 </ b> B extends radially outward from 90 </ b> A and further extends downward to surround the outer peripheral surface of the frame 86.

  The adhesive portion 90A is a cylindrical portion extending in the axial direction, and the inner peripheral wall of the adhesive portion 90A, that is, the hole wall of the through hole 92 is vulcanized and bonded to the outer peripheral surface of the mounting bracket 72. For this reason, the stopper rubber 90 moves relative to the mounting bracket 72. The extending portion 90 </ b> B is formed at a predetermined interval from the frame 86, and is in specific contact with the frame 86.

  Here, a currant 90 </ b> C is formed on the outer peripheral surface of the bonding portion 90 </ b> A at a portion facing the hole edge 88 </ b> A of the insertion hole 88. The currant 90C has a semicircular cross-sectional shape, and is continuously formed in an annular shape on the outer peripheral surface of the bonding portion 90A. The depth of the currant 90C is about 1/4 of the thickness of the bonding portion 90A. ing.

  Next, the operation of the vibration isolator 70 according to this embodiment will be described. When vibration with an excessive amplitude is input from the engine and the mounting bracket 72 moves greatly in the axial direction, the stopper rubber 90 and the frame 86 are brought into contact with each other, and the rubber elastic body 80 is prevented from being greatly elastically deformed. Thereby, the rubber elastic body 80 is hardly damaged, and the life of the vibration isolator 70 can be extended.

  On the other hand, when a load acts on the vehicle in the width direction, the stopper rubber 90 and the frame 86 are relatively moved in the radial direction, and the insertion hole 88 of the frame 86 and the adhesive portion 90A come into contact with each other. The hole edge 88A of the 88 and the bonding portion 90A are difficult to contact. Thereby, it can suppress that the adhesion part 90A is damaged from the hole edge 88A.

  In this embodiment, since the extension portion 90B of the stopper rubber 90 is thin, no currant is formed in the extension portion 90B. However, the extension portion 90B is thickened to increase the frame 86. A currant may be formed at a portion of the insertion hole 88 facing the hole edge 88A. In this case, the extension 90B and the hole edge 88A are less likely to contact each other, and damage to the stopper rubber 90 can be suppressed.

  The first to third embodiments of the present invention have been described above, but the present invention is not limited to such embodiments, and can be implemented in various modes without departing from the gist of the present invention. Of course. For example, the cross-sectional shape of the currant may be formed in a semi-elliptical shape or a rectangular shape.

10 Vibration isolator 12 Mounting bracket (bar-shaped member)
13 Stopper 14 Cylinder 16 Rubber elastic body 17 Cover rubber (buffer rubber)
17A Currant (groove)
18 frame 18A upper wall 18B peripheral wall 20 rubber plate (buffer rubber)
20A currant (groove)
38 Insertion hole 38A Hole edge 50 Vibration isolator 52 Rubber plate (buffer rubber)
52A Currant (groove)
70 Vibration isolator 72 Mounting bracket (bar-shaped member)
78 Tube 80 Rubber elastic body 86 Frame 88 Insertion hole 88A Hole edge 90 Stopper rubber 90C Currant (groove)

Claims (6)

One end is a rod-shaped member attached to either one of the vibration generator and the vibration receiver,
A cylinder that is provided on the outer peripheral side of the other end of the rod-shaped member, and is attached to either the vibration generating unit or the vibration receiving unit,
A rubber elastic body connecting the inner peripheral surface of the cylindrical body and the outer peripheral surface of the rod-shaped member so as to be elastically deformable;
A frame fixed to the outer peripheral surface of the cylindrical body, covering an axial end surface of the cylindrical body, and having an insertion hole through which the rod-shaped member is inserted;
A shock-absorbing rubber that is attached to the rod-shaped member and faces the insertion hole, and has a groove formed in a portion facing the hole edge of the insertion hole;
A vibration isolator.   The vibration isolator according to claim 1, wherein the groove is an annular groove.   The vibration isolator according to claim 1, wherein the groove is formed intermittently along a hole edge of the insertion hole.   4. The stopper according to claim 1, wherein a stopper that protrudes in a radial direction from an outer peripheral surface of the rod-shaped member and is covered with the buffer rubber is formed inside the frame. 5. The vibration isolator as described. The frame includes an upper wall in which the insertion hole is formed, and a peripheral wall formed integrally with the upper wall and connected to the cylindrical body,
The vibration isolator according to any one of claims 1 to 4, wherein the buffer rubber is a rubber plate provided on an upper surface of the upper wall.   The buffer rubber includes a cylindrical portion attached to the rod-shaped member so as to face the hole wall of the insertion hole, and an annular groove formed on the outer peripheral surface of the cylindrical portion facing the hole edge of the insertion hole. The anti-vibration device according to claim 1, further comprising:

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