JP2012219899A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a behavior of displacement of an inner cylinder member and an elastomer with respect to a bracket member, when vibration with large amplitude is input in a direction where legs are projected from an inner cylinder member side out of a radial direction.SOLUTION: The elastomer 13 has a pair of legs 15 disposed separately on both sides across an axis O of the inner cylinder member 11 in the radial direction. Each of the legs is constituted of a pair of leg pieces 18 projected from the inner cylinder member side to radially outside, and tips 17 thereof are brought into press-contact with an inner peripheral surface of the bracket member 12 and are circumferentially disposed at intervals. The inner peripheral surface of the bracket member is provided with a pair of support protrusions 22, 23 projected radially inward to catch and support tips of the leg pieces from both sides in the circumferential direction. Each of the tips of the pair of leg pieces is provided with a first engagement protrusion 21 projected in the circumferential direction, and the support protrusion is provided with a second engagement protrusion 24 projected in the circumferential direction and engaged with the first engagement protrusion from radially inside of the first engagement protrusion.

Description

  The present invention relates to a vibration isolator.

In general, the inner cylinder member connected to one of the vibration generating part and the vibration receiving part, the cylindrical bracket member connected to the other, and the inner cylinder member and the bracket member are elastically connected. An anti-vibration device including an elastic body is known.
Conventionally, for example, as shown in Patent Document 1 below, an elastic body has a pair of leg portions separately disposed on both sides sandwiching the axis of the inner cylinder member in the radial direction, and each leg portion has an inner An anti-vibration device comprising a pair of leg pieces protruding from the cylindrical member side toward the outside in the radial direction, a tip portion of which is in pressure contact with the inner peripheral surface of the bracket member, and spaced apart in the circumferential direction. Are known.

JP 2008-82517 A

  However, in the conventional vibration isolator, when a vibration having a large amplitude is input in a direction in which the leg portion protrudes from the inner cylinder member side in the radial direction, the inner cylinder member and the elastic body are in contact with the bracket member. The displacement behavior may become unstable.

  The present invention has been made in consideration of such circumstances, and when a vibration having a large amplitude is input in a direction in which the leg portion protrudes from the inner cylinder member side in the radial direction, the inner cylinder member and the elastic member are elastic. An object of the present invention is to provide a vibration isolator capable of stabilizing the behavior of the body being displaced with respect to the bracket member.

  In order to solve the above problems and achieve such an object, the vibration isolator of the present invention includes an inner cylinder member connected to one of the vibration generating unit and the vibration receiving unit, and the other connected to the other. A vibration-proof device comprising: a cylindrical bracket member to be connected; and an elastic body that elastically connects the inner cylinder member and the bracket member. A pair of legs arranged on both sides sandwiched in the direction, each leg projecting radially outward from the inner cylinder member side, and its tip is pressed against the inner peripheral surface of the bracket member And a pair of leg pieces arranged at intervals in the circumferential direction, and a pair of leg pieces sandwiched and supported from both sides in the circumferential direction on the inner peripheral surface of the bracket member. The supporting protrusion is provided so as to protrude inward in the radial direction, and the pair of leg pieces A first engaging protrusion that protrudes in the circumferential direction is disposed at each of the distal ends, and the support protrusion protrudes in the circumferential direction, and the first engaging protrusion protrudes from the first engaging protrusion. A second engagement protrusion that engages from the inside in the radial direction of the engagement protrusion is provided.

According to this invention, the tip of the leg piece is sandwiched and supported from both sides in the circumferential direction by the pair of support protrusions, and the first protrusion of the tip of the leg piece is supported on the first engagement protrusion. Since the second engaging protrusion is engaged from the inside in the radial direction of the first engaging protrusion, vibration with a large amplitude is caused in the protruding direction in which the leg protrudes from the inner cylinder member side in the radial direction. When the first engagement protrusion is engaged with the second engagement protrusion, for example, the distal end of the leg piece is disengaged from between the pair of support protrusions. It can prevent that the displacement behavior of a front-end | tip part between a pair of support protrusions becomes unstable.
This makes it possible to stabilize the behavior of the inner cylinder member and the elastic body displacing with respect to the bracket member when a vibration having a large amplitude is input in the protruding direction, thereby improving the damping performance. it can.

  Here, the first engaging protrusions are protruded from the distal ends of the pair of leg pieces toward the inner sides in the circumferential direction facing each other, and the second engaging protrusions are the pair of support members. Of the protrusions, the inner support protrusions located between the pair of leg pieces are disposed at a radially inner end, and the leg pieces of the pair of support protrusions are sandwiched in the circumferential direction. The outer support protrusion located on the opposite side of the inner support protrusion may have a smaller amount of protrusion toward the inner side in the radial direction than the inner support protrusion.

In this case, the second engagement protrusion is disposed at the radially inner end of the inner support protrusion, and the amount of protrusion toward the radially inner side of the outer support protrusion is greater than the inner support protrusion. When the vibration having a large amplitude is input in the protruding direction, the inner end portion where the first engaging protrusion portion is positioned is a pair of both end portions in the circumferential direction at the distal end portion of the leg piece. The outer end opposite to the inner end can be easily displaced inward in the radial direction while being positioned between the support protrusions.
Thereby, it becomes possible to suppress the load concerning the front-end | tip part of a leg piece, and it can improve durability.
Further, the amount of protrusion of the inner support protrusion inward in the radial direction is larger than that of the outer support protrusion, and the second engagement protrusion is disposed at the inner end of the inner support protrusion in the radial direction. Therefore, when vibration with a large amplitude is input in the protruding direction, the inner support protrusion and the second engagement protrusion are brought into contact with the inner cylinder member via the elastic body, thereby supporting the inner support. It is also possible to cause the protrusion and the second engagement protrusion to function as a stopper in the protrusion direction. Therefore, for example, since it is not necessary to dispose a stopper member in the inner cylinder member or the elastic body, it is possible to suppress the load applied to the elastic body to ensure durability and to suppress an increase in manufacturing cost. .
Furthermore, since the second engagement protrusion is disposed at the radially inner end of the inner support protrusion, when vibration with a large amplitude is input in the protrusion direction, the elastic member is interposed. It is possible to make it easy to ensure a wide area by integrally forming the stopper surface facing the inner side in the radial direction in contact with the inner cylinder member not only on the inner support protrusion but also on the entire surface including the second engagement protrusion. Tuning can be performed easily.

  The elastic body has a stopper rubber portion that protrudes radially outward from a portion located between the pair of leg portions, and has a distal end portion of the leg piece and a circumferential direction on the leg piece. May be directly connected to the outer peripheral surface of the adjacent stopper rubber portion via a concave curved surface portion that is recessed inward in the radial direction.

  In this case, the distal end portion of the leg piece and the outer peripheral surface of the stopper rubber portion adjacent to the leg piece in the circumferential direction are directly connected via a concave curved surface portion that is recessed inward in the radial direction. As described above, when a vibration with a large amplitude is input in the protruding direction, a large tensile force tends to be generated at the outer end portion of the leg piece, as described above. Is easily displaced inward in the radial direction, it is possible to effectively suppress the generation of this tensile force, and the above-described effects can be effectively achieved.

  According to the vibration isolator of the present invention, when a vibration having a large amplitude is input in a direction in which the leg portion protrudes from the inner cylinder member side in the radial direction, the inner cylinder member and the elastic body are moved with respect to the bracket member. The displacement behavior can be stabilized.

It is the schematic of the vibration isolator shown as one Embodiment concerning this invention. It is AA arrow sectional drawing of FIG.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 and 2.
The vibration isolator 1 according to the present embodiment includes an inner cylinder member 11 connected to one of a vibration generator and a vibration receiver, a cylindrical bracket member 12 connected to the other, and the inner cylinders. And an elastic body 13 that elastically connects the member 11 and the bracket member 12.
The vibration isolator 1 is used as, for example, a suspension bush for an automobile, an engine mount, or a mount for an industrial machine installed in a factory.

The inner cylinder member 11 and the bracket member 12 are arranged coaxially with the common shaft. Hereinafter, this common axis is referred to as an axis O, a direction orthogonal to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.
The inner cylinder member 11 is formed in a cylindrical shape from a metal material such as stainless steel, and the bracket member 12 is formed from a synthetic resin material, for example.
In the present embodiment, the central portions of the inner cylinder member 11 and the bracket member 12 in the direction of the axis O coincide with each other.

The elastic body 13 has an annular main body 14 whose inner peripheral surface is joined to the outer peripheral surface of the inner cylinder member 11 over the entire circumference, and protrudes radially outward from the annular main body 14 (inner cylinder member 11 side); A pair of leg portions 15 separately disposed on both sides of the axis O in the radial direction and a portion located between the pair of leg portions 15 in the annular main body portion 14 projecting outward in the radial direction. And a pair of stopper rubber portions 16.
In addition, the magnitude | size along the circumferential direction of each of the leg part 15 and the stopper rubber part 16 is mutually equivalent. Further, a radial gap is provided between the outer peripheral surface 16 a of the stopper rubber portion 16 and the inner peripheral surface of the bracket member 12.

Each leg portion 15 protrudes from the annular body portion 14 toward the outside in the radial direction, and a distal end portion 17 thereof is in pressure contact with the inner peripheral surface of the bracket member 12, and a pair of legs disposed at intervals in the circumferential direction. It is constituted by a piece 18. A first engaging protrusion 21 that protrudes in the circumferential direction is provided at each of the tip portions 17 of the pair of leg pieces 18. In the present embodiment, the first engaging protrusions 21 protrude from the respective distal end portions 17 of the pair of leg pieces 18 toward the inner sides in the circumferential direction facing each other. The first engaging protrusion 21 is formed such that the entire distal end portion 17 including the distal end surface 17a of the leg piece 18 facing outward in the radial direction protrudes toward the inner side in the circumferential direction.
In the outer peripheral surface of the annular main body 14, a recess 19 that is recessed inward in the radial direction is formed in the portion located between the pair of leg pieces 18 over the entire length in the axis O direction. The four leg pieces 18 are individually arranged at positions that are point-symmetric with respect to the axis O in the plan view of the elastic body 13.

On the inner peripheral surface of the bracket member 12, a pair of support protrusions 22 and 23 are provided projecting inward in the radial direction by sandwiching and supporting the distal end portion 17 of the leg piece 18 from both sides in the circumferential direction.
Of the pair of support protrusions 22 and 23, the inner support protrusion 22 positioned between the pair of leg pieces 18, the first engagement protrusion 21, the diameter of the first engagement protrusion 21. A second engagement protrusion 24 is provided to engage from the inside in the direction. The second engagement protrusion 24 is disposed at the radially inner end of the inner support protrusion 22. The second engagement protrusion 24 projects toward the inner end of the inner support protrusion 22 in the radial direction toward the side opposite to the direction in which the distal ends 17 of the pair of leg pieces 18 face each other in the circumferential direction. It is installed.

In the illustrated example, in the inner support protrusion 22, the surface 22 a facing the opposite side in the circumferential direction gradually increases from the outer side in the radial direction toward the inner side, and the distal ends of the pair of leg pieces 18 in the circumferential direction. 17 are extended toward the direction which mutually opposes. Moreover, each inner side support protrusion 22 which is located between a pair of leg pieces 18 and adjoins in the circumferential direction is connected in the circumferential direction, and is integrally formed.
The inner end surfaces in the radial direction of each of the inner support protrusions 22 and the second engagement protrusions 24 are smoothly connected to each other without a step, and are located on the outer side in the radial direction from the bottom surface of the recess 19 of the elastic body 13. The inner end surface in the radial direction of the inner support protrusion 22 is a flat surface. In a side view of the vibration isolator 1 as viewed from the direction of the axis O, the length of the inner end surface in the radial direction of the inner support protrusion 22 is equal to the inner diameter of the inner cylinder member 11.

Out of the pair of support protrusions 22, 23, the outer support protrusion 23 located on the opposite side of the inner support protrusion 22 sandwiching the leg piece 18 in the circumferential direction is directed more radially inward than the inner support protrusion 22. The protruding amount is small. The outer support protrusion 23 is formed in a trapezoidal shape that gradually decreases in length in the circumferential direction from the radially outer side toward the inner side. The radially inner end surface of the outer support protrusion 23 is located on the radially outer side of the radially inner end surface of the first engagement protrusion 21.
The distal end portion 17 of the leg piece 18 and the outer peripheral surface 16a of the stopper rubber portion 16 adjacent to the leg piece 18 in the circumferential direction are directly connected via a concave curved surface portion 25 that is recessed inward in the radial direction. Yes. The distal end portion 17 of the leg piece 18 and the outer peripheral surface 16a of the stopper rubber portion 16 are connected through the concave curved surface portion 25 without any step. The size of the concave curved surface portion 25 in the circumferential direction is gradually increased from the inner side to the outer side in the radial direction.

Of the support protrusions 22 and 23, all the surfaces except for both end faces in the axis O direction and the inner peripheral surface of the bracket member 12 gradually move from the outer side in the radial direction toward the inner side as going from the outer side in the axis O direction. It is inclined to head. Further, as shown in FIG. 2, a concave groove 17b extending continuously over the entire length in the circumferential direction is formed in the central portion of the leg piece 18 on the distal end surface 17a in the direction of the axis O.
As described above, the inner peripheral surface of the bracket member 12 and the surfaces of the support protrusions 22 and 23 are inclined as described above, and the groove 17b is formed in the distal end surface 17a of the leg piece 18. The positional deviation of the elastic body 13 with respect to the bracket member 12 in the axis O direction is suppressed.

As described above, according to the vibration isolator 1 according to the present embodiment, the distal end portion 17 of the leg piece 18 is sandwiched and supported by the pair of support protrusions 22 and 23 from both sides in the circumferential direction, and the leg The second engagement protrusion 24 of the inner support protrusion 22 is engaged with the first engagement protrusion 21 of the distal end portion 17 of the piece 18 from the radially inner side of the first engagement protrusion 21. Therefore, the first engagement protrusion 21 is engaged with the second engagement protrusion 24 when vibration with a large amplitude is input in the protrusion direction in which the leg portion 15 protrudes from the annular main body portion 14 in the radial direction. By doing so, for example, the tip 17 of the leg piece 18 is disengaged from between the pair of support protrusions 22, 23, and so on, between the pair of support protrusions 22, 23 of the tip 17 of the leg piece 18. It is possible to prevent the displacement behavior from becoming unstable.
As a result, it is possible to stabilize the behavior of the inner cylinder member 11 and the elastic body 13 being displaced relative to the bracket member 12 when a vibration having a large amplitude is input in the protruding direction, thereby improving the damping performance. Can be made.

In addition, the second engagement protrusion 24 is disposed at the radially inner end of the inner support protrusion 22, and the amount of protrusion toward the radially inner side of the outer support protrusion 23 is the inner support protrusion. Since it is smaller than the portion 22, the first engaging protrusion 21 is located at both ends in the circumferential direction at the distal end portion 17 of the leg piece 18 when vibration having a large amplitude is input in the protruding direction. While the inner end portion is positioned between the pair of support protrusions 22 and 23, the outer end portion opposite to the inner end portion can be easily displaced inward in the radial direction.
Thereby, it becomes possible to suppress the load concerning the front-end | tip part 17 of the leg piece 18, and durability can be improved.

  Furthermore, the protrusion amount of the inner support protrusion 22 toward the inner side in the radial direction is larger than that of the outer support protrusion 23, and the second engagement protrusion 24 is located at the inner end of the inner support protrusion 22 in the radial direction. Therefore, when a vibration having a large amplitude is input in the protruding direction, the inner support protrusion 22 and the second engagement protrusion 24 are brought into contact with the inner cylinder member 11 via the elastic body 13. By making contact with each other, the inner support protrusion 22 and the second engagement protrusion 24 can also function as a stopper in the protrusion direction. Therefore, for example, since it is not necessary to dispose a stopper member in the inner cylinder member 11 or the elastic body 13, it is possible to suppress the load applied to the elastic body 13 to ensure durability and increase the manufacturing cost. Can be suppressed.

  Furthermore, since the second engagement protrusion 24 is disposed at the radially inner end of the inner support protrusion 22, the elastic body 13 when a vibration having a large amplitude is input in the protrusion direction. The stopper surface facing the inner side in the radial direction that comes into contact with the inner cylinder member 11 via the inner part is formed integrally on the entire surface including not only the inner support protrusion 22 but also the second engagement protrusion 24, thereby making it easy to ensure a wide area. Tuning can be performed easily.

  Further, the distal end portion 17 of the leg piece 18 and the outer peripheral surface 16a of the stopper rubber portion 16 adjacent to the leg piece 18 in the circumferential direction are directly connected via a concave curved surface portion 25 that is recessed inward in the radial direction. Therefore, when a vibration with a large amplitude is input in the protruding direction, a large tensile force is likely to be generated at the outer end portion of the distal end portion 17 of the leg piece 18, although As described above, since it is easy to displace the outer end portion inward in the radial direction, it becomes possible to effectively suppress the generation of this tensile force, and the above-described effects can be effectively achieved. It becomes.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the first engagement protrusions 21 are protruded from the distal ends 17 of the pair of leg pieces 18 toward the inner sides in the circumferential direction opposite to each other, but protrude in the opposite direction. In this case, the second engagement protrusion 24 may be disposed on the outer support protrusion 23.
Further, the inner support protrusions 22 that are located between the pair of leg pieces 18 and are adjacent to each other in the circumferential direction may not be integrally formed, and may be disposed at intervals in the circumferential direction.
Further, the second engagement protrusion 24 may be disposed in the radial intermediate portion of the support protrusions 22 and 23.
Further, the protrusion amount of the inner support protrusion 22 toward the inner side in the radial direction may be equal to or less than the protrusion amount of the outer support protrusion 23 toward the inner side in the radial direction.
Further, the stopper rubber portion 16 may not be disposed, and the tip end portion 17 of the leg piece 18 and the outer peripheral surface 16a of the stopper rubber portion 16 adjacent to the leg piece 18 in the circumferential direction are formed as a concave curved surface portion. 25 may not be directly connected.
Furthermore, the axes of the inner cylinder member 11 and the bracket member 12 may be shifted without matching each other in accordance with the initial load applied to the device 1 with the vibration isolator 1 installed.

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

  It is possible to stabilize the behavior of the inner cylinder member and the elastic body being displaced with respect to the bracket member when a vibration having a large amplitude is input in a direction in which the leg portion protrudes from the inner cylinder member side in the radial direction.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 11 Inner cylinder member 12 Bracket member 13 Elastic body 15 Leg part 16 Stopper rubber part 17 Tip part 18 Leg piece 21 1st engagement protrusion 22 Inner support protrusion 23 Outer support protrusion 24 Second engagement protrusion Part 25 Concave surface O-axis

Claims (3)

An inner cylinder member connected to one of the vibration generating part and the vibration receiving part, and a cylindrical bracket member connected to the other;
An elastic body that elastically connects the inner cylinder member and the bracket member;
An anti-vibration device comprising:
The elastic body has a pair of legs arranged separately on both sides sandwiching the axis of the inner cylinder member in the radial direction,
Each leg part protrudes toward the outer side in the radial direction from the inner cylinder member side, and a tip part of the leg part presses against the inner peripheral surface of the bracket member and is disposed at a distance in the circumferential direction. Consisting of
On the inner peripheral surface of the bracket member, a pair of support protrusions that sandwich and support the tip end portion of the leg piece from both sides in the circumferential direction are provided to protrude radially inward,
A first engaging protrusion that protrudes in the circumferential direction is disposed at each tip of the pair of leg pieces,
The support protrusion is provided with a second engagement protrusion that protrudes in the circumferential direction and engages with the first engagement protrusion from the inside in the radial direction of the first engagement protrusion. An anti-vibration device characterized by that. The vibration isolator according to claim 1,
The first engagement protrusions are protruded from the distal ends of the pair of leg pieces toward the inner sides in the circumferential direction facing each other.
The second engagement protrusion is disposed at a radially inner end portion of an inner support protrusion located between the pair of leg pieces among the pair of support protrusions,
Out of the pair of support protrusions, the outer support protrusion located on the opposite side of the inner support protrusion sandwiching the leg piece in the circumferential direction is a protrusion amount directed radially inward from the inner support protrusion. A vibration isolator characterized by having a small diameter. A vibration isolator according to claim 2,
The elastic body has a stopper rubber portion projecting radially outward from a portion located between the pair of leg portions,
The distal end portion of the leg piece and the outer peripheral surface of the stopper rubber portion adjacent to the leg piece in the circumferential direction are directly connected via a concave curved surface portion that is recessed inward in the radial direction. Anti-vibration device.

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