Bush

Patent metadata

Field	Value
Publication number	US-11260713-B2
Application number	US-201816636905-A
Country	US
Kind code	B2
Filing date	Aug 29, 2018
Priority date	Sep 5, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A bush including an inner cylinder, an outer cylinder arranged radially outside the inner cylinder, and an elastic body connecting the inner cylinder and the outer cylinder, where a rubber portion 13 is provided with a bore (low-rigidity portion) 14 that extends a predetermined length in a circumferential direction and lowers rigidity in a radial direction, a convex portion 11 a that projects from the inner cylinder 11 to the outer cylinder 12 is provided at a circumferential position corresponding to the bore 14 of the inner cylinder 11 , and the convex portion 11 a is arranged to be shifted to one side in the circumferential direction with respect to a circumferential center of the bore 14.

First claim

The invention claimed is:

1. A bush comprising an inner cylinder, an outer cylinder arranged radially outside the inner cylinder, and an elastic body connecting the inner cylinder and the outer cylinder, wherein
the elastic body is provided with a low-rigidity portion that extends a predetermined length in a circumferential direction and lowers rigidity in a radial direction,
a convex portion that is formed of a metal member or a resin member and projects from the inner cylinder to the outer cylinder is provided at a circumferential position corresponding to the low-rigidity portion of the elastic body, and
a circumferential center of the convex portion is arranged to be shifted to one side in the circumferential direction with respect to a circumferential center of the low-rigidity portion.

2. The bush according to claim 1 , wherein the low-rigidity portion is a bore formed by penetrating the elastic body in a bush axial direction.

3. The bush according to claim 1 , wherein the low-rigidity portion is formed over a range having a central angle of 90° or more in the circumferential direction.

4. A bush arrangement structure, wherein the bush according to claim 1 is arranged so that a front-rear direction of a vehicle passes through the convex portion.

5. The bush according to claim 2 , wherein the low-rigidity portion is formed over a range having a central angle of 90° or more in the circumferential direction.

6. A bush arrangement structure, wherein the bush according to claim 2 is arranged so that a front-rear direction of a vehicle passes through the convex portion.

7. A bush arrangement structure, wherein the bush according to claim 3 is arranged so that a front-rear direction of a vehicle passes through the convex portion.

8. A bush arrangement structure, wherein the bush according to claim 5 is arranged so that a front-rear direction of a vehicle passes through the convex portion.

9. The bush according to claim 1 , wherein the elastic body is in the form of a rubber portion.

10. The bush according to claim 2 , wherein the elastic body is in the form of a rubber portion.

11. The bush according to claim 2 , wherein the bore has a slit-shaped portion extending in an arc shape along the circumferential direction and hole portion at both ends in the circumferential direction,
the convex portion is arranged on the radially inner side of the slit-shaped portion, and
only the elastic body with no convex portion is arranged on the radially inner side of the slit-shaped portion of the bore and arranged adjacent to the convex portion on only one side in the circumferential direction.

12. The bush according to claim 10 , wherein the bore has a slit-shaped portion extending in an arc shape along the circumferential direction and hole portion at both ends in the circumferential direction,
the convex portion is arranged on the radially inner side of the slit-shaped portion, and
only the elastic body with no convex portion is arranged on the radially inner side of the slit-shaped portion of the bore and arranged adjacent to the convex portion on only one side in the circumferential direction.

Assignees

• Bridgestone Corp

Inventors

• Hosoda Masaki

Classifications

• B60G2204/41

  Elastic mounts, e.g. bushings · CPC title

• B60G7/008 Primary

  Attaching arms to unsprung part of vehicle (B60G7/005, B60G7/006 take precedence) · CPC title

• F16F1/3828 Primary

  End stop features or buffering (F16F1/3807 takes precedence) · CPC title

• F16F15/08

  with rubber springs {(grommet- or bushing-type resilient mountings F16F1/3732, F16F1/38); with springs made of rubber and metal (arrangement of internal-combustion or jet-propulsion units B60K5/12; mounting of propulsion plants on vessels B63H21/30; mounting of vehicle drivers' cabs B62D33/0604)} · CPC title

• F16F1/3873

  having holes or openings · CPC title