JPH09280314A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability and a vibration isolating characteristic concurrently and reduce a manufacturing cost. SOLUTION: A vibration isolating device is provided with a slant part 103A where a part of one end side of an inner cylinder 103 is inclined outwardly and extends. The device is also provided with an expanding part 104A where a part of one end side of an outer cylinder 104 opposing against the slant part 103A is expanded or projected. The other end side of a resilient member 1 opposite to one end side where either the slant part 103A or the expanding part 104A is formed with an inner hole which is coaxial with the inner cylinder. A circumferential surface of the inner hole is fixed with a stopper having a predetermined inner or outer diameter size and also having a ring-like section and then a clearance for a resilient deformation of the resilient member in the radial direction is assured between the inner hole and the stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device suitable for application to, for example, suspension bushes, body mounts, member mounts, etc. of automobiles.

[0002]

2. Description of the Related Art For example, as an anti-vibration bush for a torsion beam type suspension, there is known a technology having the structure shown in FIG. 6 (also used by Volkswagen Co. Golf, etc.). That is, the anti-vibration bush 100 of the torsion beam (101) suspension is used for the wheel 1 when turning.
In order to suppress the toe-out tendency of the suspension steer angle characteristic when a lateral force is applied to 02, as shown in FIGS. 7 to 10, for example, as shown in FIGS. Proposed is one in which the inclined portions 103A and 104A extending obliquely from the axial direction of the inner cylindrical body 103 are provided, and the main axis of the elastic body 105 is slanted from the bush axial direction (corresponding to the left-right direction in the vehicle) and the axis orthogonal direction. It has been put to practical use. Further, it has a protrusion 103B projecting from the inner tubular body 103 in a direction perpendicular to the axis of the inner tubular body 103.
The displacement of the outer cylinder 104 of No. 03 in the radial direction beyond a predetermined value is restricted.

[0003]

However, in the conventional structure, since the inner cylinder 103 has the projection 103B, the rubber is provided from the projection 103B to the outer cylinder. The R portion (the bottom portion of the currant indicated by the reference numeral A) shown in FIG. 7, 10 or 11 becomes small due to the rubber die-cutting. Therefore, the R portion shown in FIG. A linear region of the graph showing the static characteristics of the bush in the direction perpendicular to the axis when the input in the front-rear direction is excessive or when the stopper hits (this linear region is the region where the vibration damping effect can be effectively exhibited). ), The durability of the rubber in this part becomes extremely severe.

Therefore, in view of the above-mentioned circumstances, the present invention is capable of improving the vibration-damping characteristics and durability, and further, reducing the manufacturing cost. It is intended to provide.

[0005]

SUMMARY OF THE INVENTION That is, the invention of claim 1 is a vibration-proof device comprising a vibration-proof rubber comprising an inner cylindrical body and an outer cylindrical body, and an elastic body connecting the inner and outer cylindrical bodies, A bottomed inner hole is formed in the elastic body from one end thereof, and a regulation means for regulating the displacement of the elastic body beyond a predetermined level is provided in the inner hole.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the accompanying drawings. In this embodiment, the same parts as those in the above-mentioned conventional example are designated by the same reference numerals to avoid redundant description. FIG. 1 is a sectional view showing an anti-vibration device applied (not limited to this vehicle, of course) to a pivot point bush (not shown) of a torsion beam of an automobile according to the present invention.

This vibration isolator comprises an inner cylinder 103 and an outer cylinder 1.
04 and the elastic body 1 connecting them, but the other end is opposite to the one end where the inclined portion 103A of the inner cylindrical body 103 of the elastic body 1 and the expanded portion 104A of the outer cylindrical body 104 are provided. An inner hole 11 is formed on the side end surface of the end, and a stopper 2 which is a separate member is attached to the inner hole 11 with a certain gap (in the radial direction) secured. Although the inner cylinder 103 is fixed to the vehicle body side in this embodiment, of course, conversely, the outer cylinder 104 side may be fixed to the arm or the torsion side.

The inner hole 11 is, as shown in FIG.
It is concentric with No. 03 and has a cylindrical shape (substantially annular shape in cross section), and a gap in the radial direction is secured to some extent, and the depth is formed to a size that does not reach the opposite end face.

The stopper 2 is made of, for example, a suitable resin (various types can be applied) and is formed in a thick ring shape. The inner peripheral surface 1 of the inner peripheral surface of the inner hole 11 is located closer to the center.
Inner peripheral surface 11A not on 1B but on the outer side (outer cylinder 104 side)
It is attached by press fitting to. As a material for forming the stopper, a resin is preferable in consideration of cost and weight reduction, but other than this, rubber or a material in which a rigid material such as iron is embedded in this rubber, aluminum, iron, etc. Materials such as are applicable.

As a method of fixing the stopper 2, the press-fitting of this embodiment may be used. However, after the outer cylindrical body 104 is vulcanized, the elastic body 1 portion is squeezed to give a slight compressive force. Since it is preferable from the viewpoint of improving durability, the stopper 2 may be sandwiched and fixed at the same time as the squeezing step. In this case, the outer diameter dimension L (see FIG. 3) of the stopper 2 in the natural state before attachment is formed to be slightly smaller than the opening dimension of the inner hole 11. It should be noted that the squeezing compression method as the method of fixing the stopper 2 causes almost no increase in the number of steps and is also preferable in that respect.

Therefore, according to this embodiment, when an external force acts, if the acting external force is in the direction perpendicular to the axis of the inner cylinder 103, it can act as a stopper function in any direction. Further, in this embodiment, the inner hole 11 is formed in the elastic body 1.
Since the stopper 2 is attached after the formation of the above, the area of the bottom surface of the inner hole 11 can be made large, and when the elastic body 1 is softened or when the elastic body 1 is formed.
Even when the (inner hole 11) is largely displaced, stress concentration on the bottom surface portion is relieved, and the durability of the rubber on the bottom surface portion of the inner hole 11 of the elastic body 1 is improved.

Next, another embodiment of the vibration isolator according to the present invention will be described. In the vibration isolator of the second embodiment shown in FIG. 4, the inner peripheral surface 11B of the elastic body 1 near the center of the inner hole 11B.
The stopper 3 is attached by press fitting. Further, a constant gap is secured between the stopper 3 and the inner peripheral surface 11A of the inner hole 11 which is located on the outer side. It should be noted that this embodiment can be applied to both the structure in which the inner cylinder body 103 is fixed to the vehicle body side and the structure in which the outer cylinder body 104 side is fixed to the arm or the torsion side.

The stopper 3 of this embodiment has a structure in which an annular reinforcing member 32 made of iron is embedded in a substantially ring-shaped member 31 made of rubber. It is attached so as to be fixed not to the inner peripheral surface 11A of the outer side but to the inner peripheral surface 11B of the center side (the inner cylindrical body 103 side). Further, as the material for forming the stopper of this embodiment, similarly to the previous embodiment, other than this, a material in which a rigid material such as iron is embedded in rubber, or a resin, or a material such as aluminum or iron is used. Applicable.

In the present invention, in addition to the stopper having a substantially cylindrical shape, for example, as shown in FIG. 5, in addition to the substantially cylindrical body portion 41, a part of one end side of the body portion 41 (of course, one Projection 4 at multiple locations instead of locations)
Alternatively, the stopper 4 may be configured so as to have 2 and thereby add a stopper function in the direction perpendicular to the axis. Further, like the projecting portion 42, the inner hole does not need to be provided over the entire circumferential direction of the elastic body, but may be provided at a part of the circumferential direction (of course, not only one place but also a plurality of places). Good.

[0015]

As described above, according to the present invention, the stopper is not integrally formed with the rubber mold by vulcanization molding but is formed as a separate piece, and the stopper is formed later. However, it is now possible to achieve both improved anti-vibration characteristics and increased durability, which was difficult to satisfy in the past due to rubber die-cutting. It is possible to significantly improve the performance and shock absorbing power at the same time, and a great effect can be obtained in practical use.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a vibration damping device according to a first embodiment of the present invention.

FIG. 2 is a front view showing one end surface of the vibration control device shown in FIG.

FIG. 3 is an exploded perspective view of the vibration isolator.

FIG. 4 is a sectional view showing a vibration isolator of a second embodiment.

FIG. 5 is an exploded perspective view showing a modified example of a stopper used in the apparatus.

FIG. 6 is a schematic explanatory view showing a pivot point bush of an automatic torsion beam.

FIG. 7 is a schematic cross-sectional view showing a conventional vibration damping device.

8 is a left front view of the vibration isolation device shown in FIG.

FIG. 9 is a right front view of the same.

FIG. 10 is a sectional view showing another conventional example.

FIG. 11 is a sectional view showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic body 11 Inner hole 2 3 4 Stopper 103 Inner cylinder 103A Inclined part 104 Outer cylinder 104A Expanded part

Claims (1)

[Claims] 1. A vibration-damping device comprising an inner cylindrical body, an outer cylindrical body, and an elastic body connecting the inner and outer cylindrical bodies to each other, wherein the elastic body has a bottomed inner hole from one end side thereof. And a regulation means for regulating the displacement of the elastic body above a predetermined level in the inner hole.