# US 9,038,995 B2 · Vibration isolator

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- Number: US 9,038,995 B2
- Document ID: US9038995B2
- Status: Granted
- Kind: B2
- Application number: 14/232,657
- Filed: 2012-07-17
- Published: 2014-06-12
- Granted: 2015-05-26
- Earliest claimed: 2011-07-15
- Assignees: Bridgestone Corporation
- Applicants: Hiroshi Kojima
- Inventors: Hiroshi Kojima
- Web page: https://patentgrep.com/patent/US9038995B2

## CPC

- F16F 13/08: the plastics spring forming at least a part of the wall of the fluid chamber of the damper (F16F13/20 - F16F13/24 take precedence)
- F16F 13/18: characterised by the location or the shape of the equilibration chamber, e.g. the equilibration chamber, surrounding the plastics spring or being annular (F16F13/1418 takes precedence)
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

A vibration isolator includes an inner tube (11), an outer tube (12) surrounding the inner tube (11) from a radial outer side of the inner tube, and an elastic body (13) coupling the inner tube (11) and the outer tube (12). Multiple pressure-absorbing fluid chambers (35, 36), whose walls are partly formed by the elastic body (13), are disposed inside the outer tube (12), and include a pair of first pressure-absorbing fluid chambers (35) interconnected through first restricting passages (37), and a second pressure-absorbing fluid chamber (36) connected to an auxiliary fluid chamber (28), in which a fluid is filled, through a second restricting passage. The pair of first pressure-absorbing fluid chambers (35) are disposed to sandwich the inner tube (11) therebetween. The second pressure-absorbing fluid chamber (36) is arranged in parallel to the inner tube (11) in an orthogonal direction (C) perpendicular to both an axial direction of the inner tube (11) and a sandwiching direction (B) in which the inner tube (11) is sandwiched between the pair of first pressure-absorbing fluid chambers (35). The inner tube (11) runs along overall lengths of the pair of first pressure-absorbing fluid chambers (35) and the second pressure-absorbing fluid chamber (36) in the axial direction.

## Claims

### Claim 1

A vibration isolator comprising:
an inner tube that is coupled to one of a vibration generating part and a vibration absorbing part;
an outer tube that surrounds the inner tube from a radial outer side of the inner tube and is coupled to the other of the vibration generating part and the vibration absorbing part; and
an elastic body that couples the inner tube and the outer tube,
wherein a plurality of pressure-absorbing fluid chambers, which are filled with a fluid and whose walls are partly formed by the elastic body, are disposed inside the outer tube,
the pressure-absorbing fluid chambers include a pair of first pressure-absorbing fluid chambers that communicate with each other through first restricting passages, and a second pressure-absorbing fluid chamber that communicates with an auxiliary fluid chamber, in which the fluid is filled, through a second restricting passage,
the pair of first pressure-absorbing fluid chambers are disposed to sandwich the inner tube therebetween,
the second pressure-absorbing fluid chamber is arranged in parallel to the inner tube in an orthogonal direction perpendicular to both an axial direction of the inner tube and a sandwiching direction in which the inner tube is sandwiched between the pair of first pressure-absorbing fluid chambers, and
the inner tube runs along overall lengths of the pair of first pressure-absorbing fluid chambers and the second pressure-absorbing fluid chamber in the axial direction.

### Claim 2 (depends on 1)

The vibration isolator according to claim 1, wherein the outer tube is formed in a rectangular shape having a pair of first side parts extending in the sandwiching direction and a pair of second side parts extending in the orthogonal direction when the vibration isolator is viewed from the front in the axial direction.

### Claim 3 (depends on 2)

The vibration isolator according to claim 2, wherein:
the elastic body includes partition parts that separate the first pressure-absorbing fluid chamber and the second pressure-absorbing fluid chamber in a circumferential direction of the inner tube; and
the partition parts extend from corners of the outer tube in a direction inclined to both directions of the sandwiching direction and the orthogonal direction so as to be coupled to the inner tube when viewed from the front.