Vibration isolator

Patent metadata

Field	Value
Publication number	US-9945442-B2
Application number	US-201415034289-A
Country	US
Kind code	B2
Filing date	Nov 7, 2014
Priority date	Nov 11, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A vibration isolator ( 10 ) includes a first attachment member ( 11 ), a second attachment member ( 12 ), an elastic body ( 13 ), and a partition member ( 16 ) configured to partition a liquid chamber in the first attachment member in which a liquid (L) is sealed into a first liquid chamber ( 14 ) and a second liquid chamber ( 15 ). A communicating passage ( 30 ) configured to communicate the first liquid chamber with the second liquid chamber is provided in the partition member. A flow changing protrusion ( 31 ) is provided at an inner circumferential surface ( 30 a ) of the communicating passage. A guide surface ( 32 ) opposite to the communicating passage and intersecting the axial direction (O) of the communicating passage is provided at the flow changing protrusion. A passing hole ( 34 ) which is open toward both sides in the axial direction is formed by a projecting end ( 31 b ) of the flow changing protrusion and another place on the inner circumferential surface ( 30 b ) of the communicating passage. The flow changing protrusion changes the flow of the liquid flowing in the communicating passage and reaching the guide surface toward the projecting end. The guide surface is formed in a concave curved surface shape which is recessed in the axial direction.

First claim

What is claimed is:

1. A vibration isolator in which a portion of a wall surface in at least one of a first liquid chamber and a second liquid chamber is formed using an elastic body, the vibration isolator comprising:
a first tubular attachment member coupled to one of a vibration generating part and a vibration receiving part;
a second attachment member coupled to the other of the vibration generating part and the vibration receiving part;
the elastic body configured to couple together the first tubular attachment member and the second attachment member; and
a partition member configured to partition a liquid chamber in the first tubular attachment member in which a liquid is sealed into the first liquid chamber and the second liquid chamber,
wherein a communicating passage between the first liquid chamber and the second liquid chamber is provided in the partition member,
a flow changing protrusion protruding from an inner circumferential surface of the communicating passage and configured to change a flow of the liquid flowing in the communicating passage in its axial direction is provided at the inner circumferential surface thereof;
the flow changing protrusion comprises a guide surface facing the communicating passage and intersecting the axial direction;
a passing hole which is open toward both sides in the axial direction is formed by a projecting end of the flow changing protrusion and another portion on the inner circumferential surface of the communicating passage, wherein the passing hole is open towards the first liquid chamber and the second liquid chamber;
the flow changing protrusion forms a rigid body and is configured to change a flow of the liquid flowing in the communicating passage and reaching the guide surface toward the projecting end; and
the guide surface is formed with a concave curved surface shape which is recessed in the axial direction.

2. The vibration isolator according to claim 1 , wherein the guide surface faces an opening of the communicating passage in the partition member in the axial direction.

3. The vibration isolator according to claim 1 , wherein a restriction passage provided at a different position from the communicating passage and configured to provide communication between the first liquid chamber and the second liquid chamber is provided in the partition member.

4. The vibration isolator according to claim 1 , wherein the guide surface is provided line-asymmetrically with respect to the axis of the communicating passage.

5. The vibration isolator according to claim 1 , wherein the flow changing protrusion is configured to cause the liquid flowing in the communicating passage in a first direction and reaching the guide surface to flow along the guide surface in the concave curved surface shape to change a flow of the liquid to a second direction substantially opposite to the first direction.

6. A vibration isolator comprising:
a tubular attachment housing;
an attachment member;
an elastic body coupling the tubular attachment housing and the attachment member;
a first liquid chamber and a second liquid chamber located inside the tubular attachment housing; and
a partition for partially separating the first liquid chamber and the second liquid chamber, wherein the partition comprises:
a communicating passage connecting the first liquid chamber and the second liquid chamber,
a rigid flow changing protrusion extending from an inner surface of the communicating passage, wherein the rigid flow changing protrusion is configured to change a flow of liquid flowing in the communicating passage,
a concave guide surface, located on the flow changing protrusion, facing the communicating passage, wherein the concave guide surface is recessed in an axial direction of the vibration isolator,
a passing hole open towards the first liquid chamber and the second liquid chamber.

7. The vibration isolator according to claim 6 , further comprising a second concave guide surface, located on an opposite side of the flow changing protrusion, wherein the second concave guide surface is recessed in an axial direction of the vibration isolator.

Assignees

• Bridgestone Corp

Inventors

• Ueki Akira

Classifications

• F16F13/107 Primary

  Passage design between working chambers · CPC title

• B60K5/1208

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

• F16F13/10

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

• F16F2230/00

  Purpose; Design features · CPC title