Fluid-filled vibration damping device

Patent metadata

Field	Value
Publication number	US-9334922-B2
Application number	US-201414541804-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Jul 19, 2012
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A fluid-filled vibration damping device including: a pressure-receiving chamber; an equilibrium chamber; a partition member having a communication aperture through which the two chambers communicate; and an elastic rubber plate superposed to cover the communication aperture from a pressure-receiving chamber side. The elastic rubber plate includes one or more contact retaining portions that are provided on an outer peripheral edge thereof and retained in contact against the partition member, and a deformation-allowing region that is provided between circumferentially opposite ends of one or two of the contact retaining portions of the elastic rubber plate and that is elastically deformable based on pressure differential between the two chambers. A gap is formed between the deformation-allowing region and the partition member so that a communication passage is constituted by including the gap through which the two chambers communicate with each other.

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 connecting the first and second mounting members;
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, the pressure-receiving chamber and the equilibrium chamber containing a non-compressible fluid sealed therein;
an orifice passage through which the pressure-receiving chamber and the equilibrium chamber communicate with each other;
a partition member that separates the pressure-receiving chamber from the equilibrium chamber while having a communication aperture through which the pressure-receiving chamber and the equilibrium chamber communicate; and
an elastic rubber plate arranged so as to cover the communication aperture by being superposed thereon from a pressure-receiving chamber side so that pressure in the pressure-receiving chamber is applied to a first surface of the elastic rubber plate while pressure in the equilibrium chamber is applied to a second surface thereof via the communication aperture, wherein
the elastic rubber plate includes one or more contact retaining portions that are provided on an outer peripheral edge thereof and retained in contact against the partition member, and a deformation-allowing region that is provided between circumferentially opposite ends of one or two of the contact retaining portions of the elastic rubber plate and that is elastically deformable based on pressure differential between the pressure-receiving chamber and the equilibrium chamber,
a gap is formed between the deformation-allowing region and the partition member so that a communication passage is constituted by including the gap through which the pressure-receiving chamber and the equilibrium chamber communicate with each other, and
in a static state of the device, the communication aperture is held in communication with the pressure-receiving chamber through the gap.

2. The fluid-filled vibration damping device according to claim 1 , wherein the partition member includes a recess that opens up on a surface thereof on the pressure-receiving chamber side while being formed on an outer peripheral side of the communication aperture and held in communication with the communication aperture, and an inner edge of the recess on a side of the communication aperture is covered by the deformation-allowing region of the elastic rubber plate while an outer edge of the recess extends outward beyond an outer periphery of the elastic rubber plate so as to form the gap.

3. The fluid-filled vibration damping device according to claim 1 , wherein
the deformation-allowing region of the elastic rubber plate includes an isolated portion whose surface on an equilibrium chamber side is located closer to the pressure-receiving chamber side than a surface of the contact retaining portion on the equilibrium chamber side, and
the contact retaining portion is abutted against a surface of the partition member on the pressure-receiving chamber side while the isolated portion of the deformation-allowing region is arranged to be separated from the surface of the partition member on the pressure-receiving chamber side so as to form the gap.

4. The fluid-filled vibration damping device according to claim 1 , wherein a cutout is formed between a circumferential end of the deformation-allowing region and one of the circumferentially opposite ends of one or two of the contact retaining portions adjacent thereto so that the deformation-allowing region is separated from the contact retaining portion in a circumferential direction by the cutout.

5. The fluid-filled vibration damping device according to claim 1 , wherein a low spring part is formed between a circumferential end of the deformation-allowing region and one of the circumferentially opposite ends of one or two of the contact retaining portions adjacent thereto and is elastically deformable more easily than the deformation-allowing region.

6. The fluid-filled vibration damping device according to claim 1 , wherein
the one or more contact retaining portions are formed of one or more thick rubber parts,
a press retaining member is provided on an opposite side from the partition member across the thick rubber part so that the thick rubber part is pressed by the press retaining member against the partition member to be elastically held clamped, and
the deformation-allowing region located between circumferentially opposite ends of one or two of the thick rubber parts is made thinner than the thick rubber part.

7. The fluid-filled vibration damping device according to claim 1 , wherein
the elastic rubber plate includes a central mounting portion integrally formed with a central portion thereof and the central mounting portion is mounted to the partition member in a fixed state,
a spoke-shaped retaining portion is provided so as to extend peripherally outward from the central mounting portion, and
the one contact retaining portion is provided at a tip of the spoke-shaped retaining portion so as to extend in a circumferential direction therefrom.

Assignees

• Sumitomo Riko Co Ltd

Inventors

• Okumura Kei

Classifications

• F16F13/106 Primary

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

• 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