Anti-vibration device

Patent metadata

Field	Value
Publication number	US-9933038-B2
Application number	US-201515115347-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	May 7, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

An anti-vibration device has excellent durability while reducing the amount of elastic deformation of an elastic body to a desired value. The disclosed anti-vibration device ( 1 ) includes an inner member ( 2 ), an outer member ( 3 ), an elastic body ( 4 ) that allows relative displacement between the inner member ( 2 ) and the outer member ( 3 ), a pair of first fluid chambers (C 1 ) in communication with each other via first restricting passages (r 1 ), and a second fluid chamber (C 2 ) in communication with an auxiliary fluid chamber (C 3 ) via a second restricting passage (r 2 ). The first fluid chambers (C 1 ) are disposed at opposite sides of the inner member ( 2 ). The second fluid chamber (C 2 ) is disposed in an orthogonal direction (Z) that is orthogonal to a sandwiching direction (Y) and to a direction along the axis (O) of the inner member (2). Stopper parts (S) are provided in the first fluid chambers (C 1 ).

First claim

The invention claimed is:

1. An anti-vibration device comprising:
an inner attachment member that is to be connected to one of a vibration generating portion and a vibration receiving portion;
an outer attachment member that surrounds the inner attachment member around an axis of the inner attachment member and is to be connected to the other one of the vibration generating portion and the vibration receiving portion;
an elastic body that is disposed between the inner attachment member and the outer attachment member and allows relative displacement between the inner attachment member and the outer attachment member by elastic deformation;
a pair of first pressure-absorbing fluid chambers, at least a portion of walls thereof being formed by the elastic body, that are in communication with each other via a first restricting passage and are filled with a fluid; and
a second pressure-absorbing fluid chamber, at least a portion of walls thereof being formed by the elastic body, that is in communication with a fluid-filled auxiliary fluid chamber via a second restricting passage and is filled with a fluid, wherein
the first pressure-absorbing fluid chambers are disposed at opposite sides of the inner attachment member,
the second pressure-absorbing fluid chamber is aligned with the inner attachment member in an orthogonal direction that is orthogonal to a direction along the axis of the inner attachment member and to a sandwiching direction in which the first pressure-absorbing fluid chambers are disposed so as to sandwich the inner attachment member,
the second pressure-absorbing fluid chamber is positioned between the axis of the inner attachment and the auxiliary fluid chamber in the orthogonal direction, and
a stopper part that restricts the relative displacement between the inner attachment member and the outer attachment member upon a load being input in the sandwiching direction is provided inside at least one of the pair of first pressure-absorbing fluid chambers.

2. The anti-vibration device of claim 1 , wherein the stopper part is provided integrally with the inner attachment member and extends from the inner attachment member towards the outer attachment member.

3. The anti-vibration device of claim 2 , wherein the stopper part includes an elastic member at least at a tip of the stopper part.

4. The anti-vibration device of claim 1 , wherein the stopper part includes an elastic member at least at a tip of the stopper part.

5. The anti-vibration device of claim 1 , wherein a space chamber is formed between the outer attached member and the elastic body, and wherein the space chamber is disposed on the opposite side of the second pressure-absorbing fluid chamber from the axis of the inner attachment member in the orthogonal direction.

6. The anti-vibration device of claim 5 , wherein an auxiliary stopper is provided at the portion of the inner attachment member, such that the auxiliary stopper extends in the orthogonal direction and is spaced apart from the outer attachment member by the space chamber.

7. The anti-vibration device of claim 1 ,
wherein the first restricting passage includes two first circumferential grooves which are formed on the outer circumferential surface of the outer attachment member, and
wherein one end of each of the first circumferential grooves is connected to a first introducing hole in communication with the auxiliary fluid chamber, and the other end of each of the first circumferential grooves is connected to a notch in communication with each of the pair of the first pressure-absorbing chambers.

8. The anti-vibration device of claim 1 ,
wherein the second restricting passage includes a first circumferential groove, a second circumferential groove and a third circumferential groove,
wherein the first and second circumferential grooves each extend in the orthogonal direction on the outer surface of the outer attachment member,
wherein the third circumferential groove extends in the sandwiching direction on the outer surface of the outer attachment member,
wherein the auxiliary fluid chamber is disposed on one side in the orthogonal direction from the axis of the inner attachment member, and the third circumferential groove is disposed on the other side in the orthogonal direction from the axis of the inner attachment member,
wherein one end of the first circumferential grooves is connected to a through-hole in communication with the second pressure-absorbing chamber, and the other end of the first circumferential grooves is connected to one of the third circumferential groove, and
wherein one end of the second circumferential grooves is connected to the other end of the third circumferential groove, and the other end of the second circumferential groove is connected to a second introducing hole in communication with the auxiliary fluid chamber.

9. The anti-vibration device of claim 1 ,
wherein the first restricting passage includes two first circumferential grooves which are formed on the outer circumferential surface of the outer attachment member,
wherein one end of each of the first circumferential grooves is connected to a first introducing hole in communication with the auxiliary fluid chamber, and the other end of each of the first circumferential grooves is connected to a notch in communication with each of the pair of the first pressure-absorbing chambers,
wherein the second restricting passage includes two second circumferential grooves and third circumferential groove,
wherein the two second circumferential grooves extend in the orthogonal direction on the outer surface of the outer attachment member,
wherein the third circumferential groove extend in the sandwiching direction on the outer surface of the outer attachment member,
wherein the auxiliary fluid chamber is disposed on one side in the orthogonal direction from the axis of the inner attachment member, and the third circumferential groove is disposed on the other side in the orthogonal direction from the axis of the inner attachment member,
wherein one end of one of the two second circumferential grooves is connected to a through-hole in communication with the second pressure-absorbing chamber, and the other end of the one of the two second circumferential grooves is connected to one of the third circumferential groove,
wherein one end of the other of the two second circumferential grooves is connected to the other end of the third circumferential groove, and the other end of the other of the two second circumferential grooves is connected to a second introducing hole in communication with the auxiliary fluid chamber, and
wherein the first restricting passage and the second restricting passage are connected to each other only via the auxiliary fluid chamber.

10. The anti-vibration device of claim 1 ,
wherein the first restricting passage includes two first circumferential grooves which are formed on the outer circumferential surface of the outer attachment member,
wherein one end of each of the first circumferential grooves is connected to a first introducing hole in communication with the auxiliary fluid chamber, and the other end of each of the first circumferential grooves is connected to a notch in communication with each of the pair of the first pressure-absorbing chambers,
wherein the second restricting passage includes two second circumferential grooves and third circumferential groove,
wherein the two second circumferential grooves extend in the orthogonal direction on the outer surface of the outer attachment member,
wherein the third circumferential groove extend in the sandwiching direction on the outer surface of the outer attachment member,
wherein the auxiliary fluid ch

Assignees

• Bridgestone Corp

Inventors

• Kojima Hiroshi

Classifications

• B60K5/1208

  Resilient supports (B60K5/1241 - B60K5/1291 take precedence) · CPC title

• F16F13/26

  characterised by adjusting or regulating devices responsive to exterior conditions {(F16F13/101 takes precedence)} · CPC title

• F16F13/14

  Units of the bushing type {, i.e. loaded predominantly radially (bushes F16F1/38; mounting brackets therefor F16F1/3849)} · CPC title

• F16F13/1409 Primary

  characterised by buffering features or stoppers · CPC title

• F16F13/10 Primary

  the wall being at least in part formed by a flexible membrane or the like (F16F13/14 - F16F13/18 take precedence) · CPC title