# US 2012/0074630 A1 · Anti-vibration bush

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- Number: US 2012/0074630 A1
- Document ID: US20120074630A1
- Status: Published application
- Kind: A1
- Application number: 13/239,850
- Filed: 2011-09-22
- Published: 2012-03-29
- Earliest claimed: 2010-09-28
- Assignees: Tokai Rubber Industries, Ltd.
- Inventors: Kazuhiko KATO; Michiharu HIKOSAKA
- Web page: https://patentgrep.com/patent/US20120074630A1

## CPC

- B60G 7/008: {Attaching arms to unsprung part of vehicle (B60G7/005, B60G7/006 take precedence)}
- F16F 1/3876: {by means of inserts of more rigid material}
- B60G 2204/143: on the vehicle body or chassis
- B60G 2204/41: Elastic mounts, e.g. bushings
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

An anti-vibration bush has a pair of intermediate members harder than a main rubber elastic body, circumferentially extending for a predetermined length, and provided radially opposite to each other radially between an inner shaft member and an outer tubular member. The intermediate members are embedded in and attached to the main rubber elastic body. An axial size of an end surface on the inner shaft member side of each of the intermediate members is larger than an axial size of an end surface on the outer tubular member side of each of the intermediate members.

## Claims

### Claim 1

An anti-vibration bush having an inner shaft member and an outer tubular member disposed external to the inner shaft member, the inner shaft member and the outer tubular member being connected by a main rubber elastic body, the anti-vibration bush comprising:
a pair of intermediate members harder than the main rubber elastic body, circumferentially extending for a predetermined length, and provided radially opposite to each other radially between the inner shaft member and the outer tubular member, wherein
the intermediate members are embedded in and attached to the main rubber elastic body, and
an axial size of an end surface on the inner shaft member side of each of the intermediate members is larger than an axial size of an end surface on the outer tubular member side of each of the intermediate members.

### Claim 2 (depends on 1)

The anti-vibration bush according to claim 1, wherein, in the main rubber elastic body, a radial size of a portion between the inner shaft member and each intermediate member is larger than a radial size of a portion between the outer tubular member and each intermediate member.

### Claim 3 (depends on 1)

The anti-vibration bush according to claim 1, wherein the pair of intermediate members are each provided with a support in a position circumferentially out of a mutually opposing radial line and exposed externally from the main rubber elastic body, the support supporting and positioning the intermediate member in molding of the main rubber elastic body.

### Claim 4 (depends on 2)

The anti-vibration bush according to claim 2, wherein the pair of intermediate members are each provided with a support in a position circumferentially out of a mutually opposing radial line and exposed externally from the main rubber elastic body, the support supporting and positioning the intermediate member in molding of the main rubber elastic body.

### Claim 5 (depends on 1)

The anti-vibration bush according to claim 1, wherein an axial length of the main rubber elastic body is greater in an internal peripheral portion than in an external peripheral portion.

### Claim 6 (depends on 2)

The anti-vibration bush according to claim 2, wherein an axial length of the main rubber elastic body is greater in an internal peripheral portion than in an external peripheral portion.

### Claim 7 (depends on 3)

The anti-vibration bush according to claim 3, wherein an axial length of the main rubber elastic body is greater in an internal peripheral portion than in an external peripheral portion.

### Claim 8 (depends on 4)

The anti-vibration bush according to claim 4, wherein an axial length of the main rubber elastic body is greater in an internal peripheral portion than in an external peripheral portion.