JP2000104777A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cracking on a thin film forming a bottom of a cavity blank and to improve durability of a rubber type elastic body. SOLUTION: A cavity blank 5 is formed extending outside in the axial direction rather than the other end side of an outside cylinder 2 by opening 5A on one end side of the outside cylinder 2 and a bottom 5B of the cavity blank 5 and a part toward the other end side of the outside cylinder from the bottom 5B are formed of a thin film part 3A of a rubber type elastic body 3 in a vibration isolating device providing the rubber type elastic body 3 between an inside cylinder 1 and the outside cylinder 2 and forming the cavity blank 5 along the axial direction on the rubber type elastic body 3.

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 used for an automobile bush called a collect bush or a toe control bush.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional motor vehicle bush is arranged at both longitudinal ends of a twist beam 10 arranged with the vehicle width direction as a longitudinal direction, with the longitudinal direction substantially in the longitudinal direction of the vehicle. A pair of trailing arms 1
1 and 12 are formed, and cylindrical bush press-fitting portions 11A and 12A are formed at the front ends of these trailing arms, respectively.
These bush press-fit portions 11A and 12A were used by being press-fitted. A reinforcing member 13 is welded to the connection between the twist beam 10 and the trailing arms 11 and 12, and a rear end of each of the trailing arms 11 and 12 is provided with a spindle 14 toward the outside of the vehicle. , 15 project from each other, and the left and right tires are supported by the spindles 14, 15. The bush press-fitting portion 11
As shown in FIG. 5, the bush press-fitted into A and 12A includes an inner cylinder 1 and an outer cylinder 2 arranged concentrically, and a rubber-like elastic body 3 vulcanized and bonded therebetween. The other end of the outer cylinder 2 is bent radially outward to form a bent portion 2A, and the inner cylinder 1 protrudes axially outward from the bent portion 2A.
A plate 4 is fixed to the outer periphery of the device by welding. The rubber-like elastic body 3 has one end along the axial direction from one end of the outer cylinder 2.
Alternatively, two or more fins 100 are formed so as to be surrounded by the rubber-like elastic body 3 except for the opening 100A on one end side. It is required that the bottom 100 </ b> B of the hollow 100 reaches the other end of the outer cylinder 2 from the viewpoint of characteristics as a spring. It is also conceivable to penetrate the garment 100 without providing the bottom 100B. Although it is desired from the viewpoint of strength, it may not be possible to add a radius in manufacturing, and the bottom 100B has to be provided. The rubber-like elastic body 3 forming the bottom 100 </ b> B is formed on the thin film portion 30 and extends linearly toward the inner peripheral surface on the other end side of the outer cylinder 2.

[0003]

In a conventional automobile bush, when a force pulling the thin film portion 30 in the left-right direction or the twisting direction in FIG. 6 acts, the thin film portion 30 is linearly connected to the other end of the outer cylinder 2. And the extension distance is short, there is a possibility that a crack may be formed at this location, and the crack that has entered the thin film portion 30 may be expanded to the rubber-like elastic body 3 other than the thin film portion 30.

Accordingly, an object of the present invention is to provide a vibration isolator in which a crack is prevented from being formed in a thin film portion forming a bottom of the hollow and the durability of a rubber-like elastic body is enhanced.

[0005]

In order to achieve the above-mentioned object, the present invention provides a rubber-like elastic body between an inner cylinder and an outer cylinder, and grinds the rubber-like elastic body along the axial direction. In the formed vibration damping device, the bulge is formed at one end of the outer cylinder and is formed so as to extend axially outward from the other end of the outer cylinder, and from the bottom of the bulge and the other end of the outer cylinder from the bottom. The facing portion is formed from a thin film portion of a rubber-like elastic body.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view taken along the line AOB of FIG. 2, and shows an inner cylinder 1 and an outer cylinder 2 which is shorter than the axial length of the inner cylinder 1 and arranged concentrically, as in the conventional example. A rubber-like elastic body 3 is provided between the rubber-like elastic bodies 3, and a rubber 5 is formed on the rubber-like elastic body 3 along the axial direction. In order to obtain desired spring characteristics, one or two or more of these burrs 5 are formed according to the use or the like.
The other end of the outer cylinder 2 is bent radially outward to form a bent portion 2A, and a plate 4 is fixed by welding to the outer periphery of the inner cylinder 1 projecting outward in the axial direction from the bent portion 2A. It is.

[0008] The turret 5 has an opening 5A at one end of the outer cylinder 2, and the outer peripheral edge of the rubber-like elastic body 3 forming the outer periphery of the opening 5A is not rounded but rounded. Further, the bulge 5 is formed longer (deeper) in the axial direction than the other end of the outer cylinder 2. The periphery of the hollow 5 is surrounded by a rubber-like elastic body 3, and the bottom 5B of the hollow 5 is formed of a thin film portion 3A having a thickness of 1.5 mm. Also, from the bottom 5B, the outer cylinder 2
Is also formed on the thin film portion 3B.

The bottom 5B of the curb 5 extends at least 3 mm (7.2 mm in this embodiment) axially outward from the other end of the outer cylinder 2, and the thickness of the thin film portions 3A and 3B is in the range of 1 to 3 mm. It is suitable. In addition, the outer periphery of the bottom 5B is not rounded but is rounded.

FIG. 2 is a view of the bush as viewed from the outside in the vehicle width direction, FIG. 3 is a left side view of FIG. 2, and FIG. 4 is a view as viewed from the inside in the vehicle width direction. . In FIG. 4, a pair of fins 5 are formed on the left and right, and a stopper 5 </ b> C extending in the axial direction at the center is formed of the rubber-like elastic body 3. In addition, a pair of other curves 50 are formed above and below the inner cylinder 1 in FIG.

[0011]

As described above, according to the present invention,
The curb is formed at one end of the outer cylinder and extends axially outward from the other end of the outer cylinder, and the bottom of the curl and a portion extending from the bottom toward the other end of the outer cylinder are formed of a rubber-like elastic body. Because it is formed from the thin film part, it is longer than the conventional thin film part, so even if radial expansion and contraction acts on this vibration isolator, the rubber-like shape that goes from the bottom to the other end of the outer cylinder The thin film portion formed of the elastic body integrally follows the expansion and contraction, and it is possible to prevent only the thin film portion forming the bottom from being pulled and the occurrence of a crack at this portion. If the thin film at the bottom is pulled, the thin film at the bottom toward the outer cylinder will also extend, and these rubber-like elastic parts will easily elastically deform, allowing more elastic deformation at the lower part. In addition, the durability of the rubber-like elastic body can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a front view of one end.

FIG. 3 is a side view.

FIG. 4 is a bottom view.

FIG. 5 is a sectional view showing a conventional example.

FIG. 6 is an enlarged sectional view of a bottom portion of a conventional example.

FIG. 7 is a diagram showing a bush press-fitting portion of the trailing arm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Rubber-like elastic body 5 Curving 5A Opening 5B Bottom 3A, 3B Thin film part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsushi Sano 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3D001 AA17 AA43 BA76 CA01 DA08 3J059 AA01 AB13 BA42 BA76 BC06 BD06 BD07 GA04

Claims (1)

[Claims] 1. A vibration isolator in which a rubber-like elastic body is provided between an inner cylinder and an outer cylinder, and a rubber is formed in the rubber-like elastic body along an axial direction. The opening is formed so as to extend axially outward from the other end of the outer cylinder, and the bottom and the portion from the bottom toward the other end of the outer cylinder are formed from a thin film portion of a rubber-like elastic body. Characteristic anti-vibration device.