JP2008248951A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of securing sufficient strength in a stopper part inside a limited space. <P>SOLUTION: The vibration control device is equipped with an inner shaft member 1, an outer cylinder member 2 disposed on the outside of the inner shaft member 1 and separated by a distance, a rubber elastic body 3 interposed between the inner shaft member 1 and the outer cylinder member 2 for elastically connecting the both members 1, 2, and a separate stopper 4 having an annular base part 41 and the stopper part 42, and attached to an axial end of the outer cylinder member 2. The separate stopper 4 includes the annular base part 41 formed in an annular shape and press-fitted on an inner periphery at the axial end of the outer cylinder member 2, and the stopper part 42 provided to at least a portion of an axial end of the annular base part 41 in the circumferential direction and extending radially outward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is suitably employed in a vehicle, for example, as an engine mount, a member mount, a cab mount, or the like.

  Conventionally, when a power unit serving as a vibration generation source is mounted on a vehicle, an engine mount as an anti-vibration device is interposed between the body frame and the power unit. As such an anti-vibration device, for example, as shown in FIGS. 7 and 8, an inner shaft member 81 connected and fixed to the power unit side, an outer cylinder portion 82a, an inner cylinder portion 82b, and a pair of bracket portions 82c and 82c are provided. And an outer cylinder member 82 that is coaxially disposed with a distance in the axial direction and the radial direction from the inner shaft member 81 and is connected and fixed to the vehicle body side, and is interposed between the inner shaft member 81 and the outer cylinder member 82. And a rubber elastic body 83 that elastically couples both members 81 and 82 are known.

  The vibration isolator is attached to the inner shaft member 81 in order to restrict excessive relative displacement between the inner shaft member 81 and the outer cylinder member 82 in the bound direction (axial direction) and to ensure durability. A bound stopper mechanism is configured by an elastic stopper member (not shown) and a stopper portion 84 fixed to one axial end portion of the outer cylinder member 82. Here, since the stopper member attached to the inner shaft member 81 is limited in space, it is formed in an arm shape so as to extend in one radial direction from the axial center of the inner shaft member 81. The stopper portion 84 that is disposed opposite to the arm-shaped stopper member in the axial direction is provided at a part of the circumferential direction (an angle range of about 90 °) at the axial end portion of the outer cylindrical member 82.

  By the way, in recent years, it has become difficult to secure a space for various devices arranged in the engine room as the performance of the vehicle increases, and an engine mount arranged in a limited space is also space-saving. Easy to be restricted. In particular, in the case of the above vibration isolator, the input load becomes very large as the power unit increases in weight, and the pressure receiving area of the stopper portion 84 is small. Since it is necessary to satisfy the requirement, it is necessary to ensure sufficient strength of the stopper portion 84.

  In Patent Document 1, a stopper member is fitted in an axially penetrating stopper opening provided in a rubber elastic body, and the maximum displacement amount can be regulated after vulcanization molding of the rubber elastic body. An engine mount is disclosed. Further, in Patent Document 2, a side stopper having both ends projecting to the outer peripheral side of the outer cylinder is provided in the through hole provided in the rubber elastic body, so that the anti-vibration function can be exhibited even when a large load is applied. In addition, a vibration isolator capable of improving durability is disclosed. Further, in Patent Document 3, a stopper rubber portion that protrudes in the axial direction from the end portion of the outer cylinder fitting is provided at the end portion on the front end side in the press-fitting direction into the mounting hole of the rubber elastic body, and integrated with the rubber elastic body. An anti-vibration device is disclosed in which a larger stopper contact surface can be set in the stopper rubber portion. However, the vibration isolator disclosed in Patent Documents 1 to 3 is not intended to improve the strength of the stopper portion.

JP-A-7-83280 JP-A-8-226480 JP 2001-295886 A

  The present invention has been made in view of the above circumstances, and it is an object to be solved to provide a vibration isolator capable of ensuring sufficient strength of the stopper portion in a limited space. It is.

  The present invention that solves the above-described problems includes an inner shaft member, an outer cylinder member that is disposed on the outer side of the inner shaft member at a distance, and both members interposed between the inner shaft member and the outer cylinder member. A rubber elastic body that elastically connects the annular base portion and an annular base portion that is annularly formed and press-fitted into the inner periphery of the axial end portion of the outer cylindrical member, and the axial direction of the annular base portion It is characterized in that a separate stopper is provided which includes a stopper portion provided at least at one end portion in the circumferential direction and extending radially outward.

  In the vibration isolator of the present invention, since the annular base portion of the separate stopper is press-fitted into the inner periphery of the axial end portion of the outer cylindrical member, the rigidity of the axial end portion of the outer cylindrical member is increased and the cross-sectional area is also increased. To do. As a result, sufficient strength is ensured at the axial end portion of the outer cylinder member, so that the strength of the stopper portion formed integrally with the annular base portion is greatly improved. The annular base portion can sufficiently increase the rigidity of the axial end portion of the outer cylindrical member by being press-fitted even if the radial thickness is not so thick. Less space is required and space is easy to secure. Therefore, the vibration isolator of the present invention can ensure sufficient strength of the stopper portion in a limited space.

  As a preferred aspect of the present invention, the stopper portion protrudes outward from the outer peripheral surface of the outer cylinder member. If it is made like this, since the pressure receiving area of the stopper portion can be increased, the strength of the stopper portion can be improved.

  Moreover, as another preferred aspect of the present invention, the annular base portion has an overhanging portion projecting radially inward at least at a part of the circumferential direction. If it is made like this, since the rigidity of the annular base can be increased more effectively, it is possible to further improve the strength at the axial end of the outer cylinder member. Further, since the stopper portion can be expanded radially inward, the pressure receiving area of the stopper portion can be increased correspondingly, and sufficient strength can be advantageously ensured.

  The vibration isolator of the present invention is provided in at least a part in the circumferential direction at an annular base portion that is annularly formed and press-fitted into the inner periphery of the axial end portion of the outer cylindrical member, and at one axial end portion of the annular base portion. Since the separate stopper which consists of the stopper part extended to radial direction outward is provided, sufficient intensity | strength of a stopper part can be ensured within the limited space.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1
FIG. 1 is a cross-sectional view taken along the axial direction of the vibration isolator according to the first embodiment, and is a cross-sectional view taken along the line II of FIG. 2, and FIG. 2 is a plan view of the vibration isolator.

  As shown in FIGS. 1 and 2, the vibration isolator of the present embodiment includes an inner shaft member 1, an outer cylinder member 2 disposed at a distance from the outer side of the inner shaft member 1, and an inner shaft member 1. A rubber elastic body 3 that is interposed between the outer cylindrical member 2 and elastically connects both members, and has a ring-shaped base 41 and a stopper portion 42 and is mounted on the axial end of the outer cylindrical member 2. And a stopper 4.

  The inner shaft member 1 includes a thick circular plate-like base portion 11 and a truncated cone-shaped bulging portion 12 that bulges toward the lower end side of the base portion 11 and gradually decreases in diameter downward. Is formed. The inner shaft member 1 is provided with a screw hole 13 extending along the axis and opening in the base 11. The screw hole 13 is a screw into which a mounting bolt (not shown) is screwed when the inner shaft member 1 is mounted to the mounting mating member, and is a stopper disposed opposite to the separate stopper 4 by the mounting bolt. A member (not shown) is attached between the inner shaft member 1 and the attachment counterpart member.

  The outer cylinder member 2 is fixed by welding to the cylindrical outer cylinder part 21, the bottomed cylindrical inner cylinder part 22 that is press-fitted and fixed to the inner periphery of the outer cylinder part 21, and the outer peripheral surface of the outer cylinder part 21. A pair of bracket portions 23, 23 and a stopper piece 24 fixed to one axial end portion (the upper end portion in FIG. 1) of the outer cylindrical portion 21 by welding. The outer cylindrical portion 21 has an axial length that is longer than the inner cylindrical portion 22 by a predetermined dimension, and protrudes upward from one end portion (upper end portion in FIG. 1) of the inner cylindrical portion 22 by the length. Yes. A notch recess that is recessed stepwise in the axial direction is formed in one axial end surface (upper end surface in FIG. 1) of the outer cylindrical portion 21 in a quarter range (angle range of about 90 °) on the circumference. The stopper piece 24 is fixed to the notch recess.

  The stopper piece 24 is a thick plate having a substantially triangular shape having one arc-shaped side along the inner peripheral surface of the outer cylindrical portion 21 and two sides intersecting at right angles to each other, and is three times as large as the outer cylindrical portion 21. It is about the wall thickness. The stopper piece is fitted into the notch recess of the outer cylindrical portion 21 with the edge portion along one side of the arcuate shape such that the corner side intersecting the two right angles is directed radially outward of the outer cylindrical portion 21. In this state, it is fixed by welding. Thereby, the end surface of the outer cylinder part 21 and one surface (upper surface in FIG. 1) of the stopper piece 24 fitted in the notch recess are located on the same surface. The outer cylinder member 2 is coaxially disposed with a distance from the inner shaft member 1 in the axial direction and the radial direction.

  The rubber elastic body 3 is formed in a thick tapered cylindrical shape by vulcanizing and molding a rubber material together with the inner shaft member 1 and the inner cylindrical portion 22. The rubber elastic body 3 is vulcanized and bonded to the tapered surface of the frustoconical bulging portion 12 at the small diameter side end, and the large diameter side end portion is vulcanized to the inner peripheral surface and bottom surface of the inner cylindrical portion 22. It is glued. Thereby, the rubber elastic body 3 is interposed between the inner shaft member 1 and the outer cylinder member 2 and integrally and elastically connects both the members 1 and 2.

  The separate stopper 4 includes an annular base portion 41 formed in an annular shape, and a stopper portion 42 that bends and extends radially outward (axially perpendicular direction) from one axial end of the annular base portion 41. It is integrally formed of a ferrous metal having substantially the same thickness as 21. The annular base portion 41 has an outer diameter that is substantially the same as or slightly larger than the inner diameter of the outer cylindrical portion 21. The stopper portion 42 is formed in a substantially triangular shape having the same shape as the stopper piece 24, and is provided in a quarter range (an angle range of about 90 °) on the circumference of the annular base portion 41.

  The separate stopper 4 is mounted by press-fitting the annular base portion 41 into the inner periphery of one axial end portion (the upper end portion in FIG. 1) of the outer cylindrical portion 21, and the stopper portion 42 is placed on the stopper piece 24. It is located in an overlapping state. Thereby, most of the stopper part 42 protrudes outward from the outer peripheral surface of the outer cylinder part 21. It should be noted that the end portion of the portion other than the stopper portion 42 (in the range of 3/4 on the circumference) on the circumference of one end in the axial direction of the annular base 41 is slightly bent radially outward. The bent portion does not protrude outward from the outer peripheral surface of the outer cylindrical portion 21.

  In the vibration isolator of the present embodiment configured as described above, the annular base portion 41 of the separate stopper 4 is press-fitted into the inner periphery of the axial end portion of the outer cylindrical portion 21, so that the outer cylindrical portion 21 (outer The rigidity of the axial end of the cylindrical member 2) increases and the cross-sectional area also increases. Thereby, sufficient strength is secured at the axial end portion of the outer cylindrical portion 21 (outer cylindrical member 2), so that the strength of the stopper portion 42 formed integrally with the annular base portion 41 is greatly improved. The annular base portion 41 can sufficiently increase the rigidity of the axial end portion of the outer cylindrical portion 21 (outer cylindrical member 2) by being press-fitted even if the radial thickness is not so thick. Therefore, the arrangement space for the annular base 41 is small, and the space can be easily secured.

  Therefore, according to the vibration isolator of this embodiment, sufficient strength of the stopper portion 42 can be ensured in a limited space. Moreover, since the stopper part 42 protrudes outward from the outer peripheral surface of the outer side cylinder part 21, since the pressure receiving area of the stopper part 42 can be enlarged, the intensity | strength of the stopper part 42 is improved. Can be made.

[Embodiment 2]
3 is a cross-sectional view taken along the axial direction of the vibration isolator according to Embodiment 1, and is a cross-sectional view taken along the line III-III in FIG. 4, and FIG. 4 is a plan view of the vibration isolator.

  As shown in FIGS. 3 and 4, the vibration isolator of the present embodiment has the same basic configuration as that of the first embodiment, but the stopper piece 24 of the outer cylinder member 2 used in the first embodiment. It differs from the first embodiment only in that is omitted. That is, since the stopper piece 24 is omitted from the outer cylindrical portion 21 in the present embodiment, a notch recess for attaching the stopper piece 24 is not provided at one end in the axial direction. The axial length is shorter than that of the outer cylindrical portion 21 of the first embodiment. In addition, since there is no difference except this, about the main member and site | part which are common in the thing of Embodiment 1, only the same code | symbol as Embodiment 1 is attached | subjected to FIG.3 and FIG.4, and detailed description is abbreviate | omitted. .

  The vibration isolator of the present embodiment configured as described above includes an annular base 41 that is annularly formed and press-fitted into the inner periphery of the axial end of the outer cylinder 21 (outer cylinder member 2), and the annular base. 41 is provided with a separate stopper 4 including a radially outwardly extending stopper portion 42 provided in at least a part of the circumferential direction at one end portion in the axial direction, and thus the stopper portion 42 within a limited space. Thus, it is possible to ensure sufficient strength, and the same operations and effects as in the case of the first embodiment are obtained. In particular, in this embodiment, since the stopper piece 24 is omitted, the structure can be simplified and the size can be reduced, so that the cost can be reduced.

[Embodiment 3]
5 is a cross-sectional view taken along the axial direction of the vibration isolator according to Embodiment 1, and is a cross-sectional view taken along line VV in FIG. 6, and FIG. 6 is a plan view of the vibration isolator.
As shown in FIGS. 5 and 6, the vibration isolator of the present embodiment has the same basic configuration as that of the second embodiment, but is stretched radially inward on the annular base 41 of the separate stopper 4. It differs from that of Embodiment 2 only in that an overhanging portion 43 is provided.

  The overhanging portion 43 in the present embodiment is formed such that a portion from the center in the axial direction to the one end (the upper end in FIG. 5) of the annular base portion 41 protrudes inward in the radial direction. It is provided over the circumference. By providing the overhang portion 43 in this way, the stopper portion 42 is expanded radially inward, and the pressure receiving area of the stopper portion 42 is increased accordingly.

  The anti-vibration device of the present embodiment configured as described above exhibits the same operations and effects as those of the second embodiment. Furthermore, in the present embodiment, since the annular base portion 41 is provided with the overhanging portion 43 that projects radially inward, the rigidity of the annular base portion 41 can be more effectively increased. The strength at the axial end of 21 (outer cylinder member 2) can be further improved. Moreover, since the pressure receiving area of the stopper part 42 can be expanded, sufficient strength can be advantageously ensured. In addition, in this embodiment, although the overhang | projection part 43 is provided over the perimeter with respect to the cyclic | annular base part 41 in the circumferential direction, you may make it provide intermittently in the circumferential direction.

  In this embodiment, the separate stopper 4 is press-fitted and fixed to the inner periphery of the outer cylinder member 21, but the axial length of the inner cylinder part 22 is increased and the inner cylinder part 22 is press-fitted to the inner periphery. It may be fixed. Furthermore, the specific structure of the vibration isolator shown in the present embodiment is merely an example, and the present invention can be formed by, for example, forming a pressure receiving chamber, an equilibrium chamber, and an orifice passage inside the vibration isolator. It can be applied to a fluid-filled vibration isolator in which an incompressible fluid is sealed.

It is sectional drawing which follows the axial direction of the vibration isolator which concerns on Embodiment 1 of this invention, Comprising: It is the II sectional view taken on the line of FIG. It is a top view of the vibration isolator which concerns on Embodiment 1 of this invention. It is sectional drawing which follows the axial direction of the vibration isolator which concerns on Embodiment 2 of this invention, Comprising: It is the III-III sectional view taken on the line of FIG. It is a top view of the vibration isolator which concerns on Embodiment 2 of this invention. It is sectional drawing in alignment with the axial direction of the vibration isolator which concerns on Embodiment 3 of this invention, Comprising: It is the VV arrow directional cross-sectional view of FIG. It is a top view of the vibration isolator which concerns on Embodiment 3 of this invention. It is sectional drawing which follows the axial direction of the conventional vibration isolator, Comprising: It is the VII-VII arrow directional cross-sectional view of FIG. It is a top view of the conventional vibration isolator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 81 ... Inner shaft member 11 ... Base part 12 ... Protruding part 13 ... Screw hole 2, 82 ... Outer cylinder member 21, 82a ... Outer cylinder part 22, 82b ... Inner cylinder part 23, 82c ... Bracket part 24 ... Stopper piece 3, 83 ... Rubber elastic body 4 ... Separate stopper 41 ... Annular base 42, 84 ... Stopper portion 43 ... Overhang portion

Claims (3)

An inner shaft member, an outer cylinder member arranged at a distance from the outer side of the inner shaft member, and a rubber elastic body that is interposed between the inner shaft member and the outer cylinder member and elastically connects the two members. In the vibration isolator composed of
An annular base formed in an annular shape and press-fitted into the inner periphery of the axial end of the outer cylindrical member, and radially outwardly provided at least in the circumferential direction at one axial end of the annular base An anti-vibration device comprising a separate stopper made up of a stopper portion.   The vibration isolator according to claim 1, wherein the stopper portion protrudes outward from an outer peripheral surface of the outer cylinder member.   3. The vibration isolator according to claim 1, wherein the annular base portion has an overhanging portion projecting radially inward at least in a part of the circumferential direction.

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