Fluid-filled vibration damping device

Patent metadata

Field	Value
Publication number	US-9970506-B2
Application number	US-201314142516-A
Country	US
Kind code	B2
Filing date	Dec 27, 2013
Priority date	Dec 27, 2011
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A fluid-filled vibration damping device including a hollow buffer body with an inner space. The hollow buffer body is housed in a housing space of a partition member to come in contact with wall inner surfaces of the housing space on sides of a pressure-receiving chamber and an equilibrium chamber, while stores a movable member in the inner space thereof. Liquid pressure of the pressure-receiving chamber is applied to a first face of the movable member by having a first window portion formed in the buffer body communicated with a first communication hole of the housing space while liquid pressure of the equilibrium chamber is applied to a second face of the movable member by having a second window portion formed in the buffer body communicated with a second communication hole of the housing space.

First claim

What is claimed is:

1. A fluid-filled vibration damping device comprising:
a first mounting member;
a second mounting member;
a main rubber elastic body elastically connecting the first and second mounting members;
a partition member supported by the second mounting member, the partition member forming a housing space;
a pressure-receiving chamber whose wall portion is partially defined by the main rubber elastic body;
an equilibrium chamber whose wall portion is partially defined by a flexible film;
an orifice passage through which the pressure-receiving chamber and the equilibrium chamber communicate with each other;
a hollow buffer body housed in the housing space to come in contact with wall inner surfaces of the partition member; and
a movable member housed within an inner space of the hollow buffer body such that liquid pressure of the pressure-receiving chamber is applied to a first face of the movable member and liquid pressure of the equilibrium chamber is applied to a second face of the movable member, respectively, through a first communication hole formed in the partition member on the side of the first face, and a second communication hole formed in the partition member on the side of the second face, respectively, wherein
the pressure-receiving chamber and the equilibrium chamber are disposed on either side of the partition member and filled with a non-compressible fluid,
the hollow buffer body is an integral band-like cylindrical body having: (i) a pair of facing plate portions placed in contact with each wall inner surface of the partition member on respective sides of the pressure-receiving chamber and the equilibrium chamber, and (ii) a pair of side plate portions that connect the pair of facing plate portions to each other, and
the liquid pressure of the pressure-receiving chamber is applied to the first face of the movable member by having a first window portion formed in the hollow buffer body communicated with the first communication hole while the liquid pressure of the equilibrium chamber is applied to the second face of the movable member by having a second window portion formed in the hollow buffer body communicated with the second communication hole.

2. The fluid-filled vibration damping device according to claim 1 , wherein the hollow buffer body is formed with a protrusion that protrudes toward at least one of the pressure-receiving chamber and the equilibrium chamber so that the protrusion comes in contact with an inner surface of the partition member.

3. The fluid-filled vibration damping device according to claim 2 , wherein the protrusion extends continuously in an annular form, while the protrusion is provided so as to surround at least one of an opening of the first window portion on a side of the first communication hole and an opening of the second window portion on a side of the second communication hole.

4. The fluid-filled vibration damping device according to claim 1 , wherein a locking protrusion is provided in the partition member to protrude therein, while a locking hole is formed in the hollow buffer body and a first positioning member for positioning the hollow buffer body relative to the partition member is configured by having the locking protrusion inserted into the locking hole and locked thereto.

5. The fluid-filled vibration damping device according to claim 4 , wherein the locking protrusion protrudes in a direction towards the pressure-receiving chamber and the equilibrium chamber, while the locking hole is formed through walls of the hollow buffer body on the side of the pressure-receiving chamber and on the side of the equilibrium chamber, and the locking protrusion, when inserted through the locking hole, penetrates through the hollow buffer body.

6. The fluid-filled vibration damping device according to claim 4 , wherein the locking protrusion protrudes in the direction towards the pressure-receiving chamber and the equilibrium chamber, while the locking hole is formed through the hollow buffer body on exclusively on of: the side of the pressure-receiving chamber and the side of the equilibrium chamber.

7. The fluid-filled vibration damping device according to claim 1 , wherein the movable member comprises a movable plate independent from the partition member and the hollow buffer body.

8. The fluid-filled vibration damping device according to claim 1 , wherein the movable member comprises a movable film supported by at least one of the partition member and the hollow buffer body.

9. The fluid-filled vibration damping device according to claim 8 , wherein the movable film is integrally formed with the hollow buffer body.

10. The fluid-filled vibration damping device according to claim 1 , wherein a buffer protrusion is provided in at least one of the hollow buffer body and the movable member, the buffer protrusion protruding inward in a direction of facing the hollow buffer body and the movable member.

11. The fluid-filled vibration damping device according to claim 10 , wherein an allowance area for deformation is provided by the first or second communication holes, and formation of the buffer protrusion is arranged within the allowance area for deformation away from the housing space.

12. The fluid-filled vibration damping device according to claim 10 , wherein the buffer protrusion extends continuously in an annular form, while one of an opening of the first window portion on the side of the inner space and an opening of the second window portion on the side of the inner space is surrounded by the buffer protrusion.

13. The fluid-filled vibration damping device according to claim 1 , wherein the hollow buffer body is provided with a positioning portion, while the partition member is provided with a positioning hole through the wall of the partition member, and a second positioning member for positioning the hollow buffer body within the housing space is configured by means of arranging the positioning portion placed over the positioning hole.

14. The fluid-filled vibration damping device according to claim 1 , wherein a concave/convex portion is provided on at least one of the wall inner surfaces of the partition member on the side of the pressure-receiving chamber and the side of the equilibrium chamber, and a contact area is made small between the hollow buffer body and the wall inner surface of the partition member provided with the concave/convex portion.

15. The fluid-filled vibration damping device according to claim 1 , wherein a communication passage is formed on the wall of the hollow buffer body on the side of the pressure-receiving chamber for connecting to the first communication hole, and a first leak passage is formed to always maintain communication between the pressure-receiving chamber and the housing space via the first communication hole and the communication passage.

16. The fluid-filled vibration damping device according to claim 15 , wherein
the hollow buffer body is an integral band-like cylindrical body having: (i) a pair of facing plate portions placed in contact with each wall inner surface of the partition member on respective sides of the pressure-receiving chamber and the equilibrium chamber, and (ii) a pair of side plate portions that connect these pair of facing plate portions to each other, and
the communication passage formed in the facing plate portion on the side of the pressure-receiving chamber extends in a direction perpendicular to a direction of facing of the pair of side plate portions to be communicated with the first communication hole via the first window portion.

17. The

Assignees

• Sumitomo Riko Co Ltd

Inventors

• Kanaya Tomohiro

Classifications

• F16F13/106 Primary

  Design of constituent elastomeric parts, e.g. decoupling valve elements, or of immediate abutments therefor, e.g. cages · CPC title