Vibration isolator

Patent metadata

Field	Value
Publication number	US-9719576-B2
Application number	US-201514820867-A
Country	US
Kind code	B2
Filing date	Aug 7, 2015
Priority date	Aug 20, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A vibration isolator includes a partition member ( 15 ) that partitions a liquid chamber ( 16 ) in a first mounting member ( 11 ) into a primary liquid chamber ( 16 a ) using an elastic body ( 13 ) as a part of a wall surface thereof and a secondary liquid chamber ( 16 b ), and a movable member ( 23 ) housed in a housing chamber ( 20 ) provided within the partition member ( 15 ), the movable member being free to be deformed or displaced in an axial direction of the first mounting member ( 11 ). The partition member ( 15 ) is provided with a plurality of communicating holes ( 22 ) that extend from a portion of the partition member ( 15 ) which is exposed to the primary or secondary liquid chamber ( 16 a or 16 b ) toward the inside of the partition member and are open toward the movable member ( 23 ). The partition member ( 15 ) is equipped with partition plate parts ( 18 and 19 ) of which front and back surfaces are directed in the axial direction of the first mounting member, the partition plate parts dividing the housing chamber ( 20 ) from the primary and dividing the housing chamber from secondary liquid chamber ( 16 a or 16 b ). The communicating holes ( 22 ) include communicating pores ( 24 ) which pass through the partition plate parts ( 18 and 19 ), and each of which has an inner diameter of 3.6 mm or less.

First claim

What is claimed is:

1. A vibration isolator comprising:
a first mounting member having a tubular shape and connected to one of a vibration generator and a vibration absorber, and a second mounting member connected to the other of the vibration generator and the vibration absorber;
an elastic body configured to connect the first and second mounting members;
a partition member disposed within the first mounting member and configured to partition a liquid chamber within which a liquid is enclosed into a primary liquid chamber using the elastic body as a part of a wall surface thereof and a secondary liquid chamber; and
a movable member housed in a housing chamber provided within the partition member, the movable member being free to be deformed or displaced in an axial direction of the first mounting member,
wherein the partition member is provided with a plurality of communicating holes that extend from a portion of the partition member which is exposed to the primary liquid chamber or the secondary liquid chamber toward an inside of the partition member and are open toward the movable member,
the partition member is equipped with partition plate parts of which front and back surfaces are directed in the axial direction of the first mounting member, the partition plate parts dividing the housing chamber from the primary liquid chamber and dividing the housing chamber from the secondary liquid chamber,
the communicating holes include communicating pores that pass through the partition plate parts,
each of the communicating pores has an inner diameter of 3.6 mm or less wherein the inner diameter is a shortest transverse distance of the communicating pore on a straight line perpendicular to the axial direction of the first mounting member,
the communicating pores are disposed to be tangent externally to each other throughout both of the partition plate parts, which are provided at both sides of the movable member in the axial direction of the first mounting member;
the communicating holes further comprise large-diameter communicating holes which pass through the partition plate parts in the axial direction of the first mounting member and wherein a minimum inner diameter of the large-diameter communicating holes is greater than a diameter of the communicating pores;
the communicating pores are disposed at portions of the partition plate parts radially inside of the large-diameter communicating holes; and
wherein the large-diameter communicating holes are disposed in an annular array;
wherein the large-diameter communicating holes are disposed to be tangent externally to each other throughout the annular array.

2. The vibration isolator according to claim 1 , wherein the communicating pores are formed in a tapered shape extending in the axial direction, so as to have a maximum and a minimum inner diameter, wherein the minimum inner diameter is 3.6 mm or less.

3. The vibration isolator according to claim 2 , wherein the communicating pores are reduced in diameter toward the inside of the partition member in the axial direction.

4. The vibration isolator according to claim 1 , wherein an outer circumferential edge of the movable member is fixed.

5. The vibration isolator according to claim 4 , wherein the movable member blocks the large-diameter communicating holes and the communicating pores.

6. The vibration isolator according to claim 5 , further comprising a diaphragm, wherein the primary liquid chamber is a single chamber extending from the elastic body to the movable member, and the secondary liquid chamber is a single chamber extending from the diaphragm to the movable member.

7. The vibration isolator according to claim 1 , wherein the movable member blocks the large-diameter communicating holes and the communicating pores.

8. The vibration isolator according to claim 1 , further comprising a diaphragm, wherein the primary liquid chamber is a single chamber extending from the elastic body to the movable member, and the secondary liquid chamber is a single chamber extending from the diaphragm to the movable member.

Assignees

• Bridgestone Corp

Inventors

• Nagasawa Masakazu
• Ueki Akira
• Ono Shuhei
• Nagashima Yasuyuki

Classifications

• F16F13/08

  the plastics spring forming at least a part of the wall of the fluid chamber of the damper (F16F13/20 - F16F13/24 take precedence) · CPC title

• F16F13/107 Primary

  Passage design between working chambers · CPC title

• B60K5/1208

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

• F16F13/105 Primary

  characterised by features of partitions between two working chambers · CPC title