Fluid-filled vibration damping device

Patent metadata

Field	Value
Publication number	US-9394964-B2
Application number	US-201314059999-A
Country	US
Kind code	B2
Filing date	Oct 22, 2013
Priority date	Oct 26, 2012
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

A fluid-filled vibration damping device including a second orifice passage and a third orifice passage tuned to a lower frequency than the second orifice passage, and an actuator including an output portion facing openings of the second and third orifice passages on a side of an equilibrium chamber via a flexible film. The flexible film obstructs the openings of the second and third orifice passages when the output portion comes into contact against a partition member so that the third orifice passage is blocked while the second orifice passage is substantially placed in communication owing to a center recess of the output portion permitting deformation of the flexible film. Meanwhile, the flexible film is separated from the openings of the second and third orifice passages when the output portion is separated from the partition member so that the two orifice passages are placed in communication.

First claim

What is claimed is:

1. A fluid-filled vibration damping device comprising:
a first mounting member and a second mounting member elastically connected by a main rubber elastic body;
a partition member supported by the second mounting member and defining to one side of the partition member a pressure-receiving chamber whose wall is partially constituted by the main rubber elastic body, while defining to another side of the partition member an equilibrium chamber whose wall is partially constituted by a flexible film, the pressure-receiving chamber and the equilibrium chamber being filled with a non-compressible fluid; and
a first orifice passage formed in an outer peripheral portion of the partition member and permitting communication between the pressure-receiving chamber and the equilibrium chamber;
a second orifice passage formed in a center portion of the partition member and tuned to a higher frequency than the first orifice passage while permitting communication between the pressure-receiving chamber and the equilibrium chamber;
a third orifice passage formed in the center portion of the partition member and tuned to a lower frequency than the second orifice passage while permitting communication between the pressure-receiving chamber and the equilibrium chamber; and
an actuator disposed on an opposite side of the equilibrium chamber with the flexible film being interposed therebetween, wherein
an output portion of the actuator faces openings of the second orifice passage and the third orifice passage on a side of the equilibrium chamber via the flexible film, while the output portion of the actuator includes a center recess that opens in a part facing the opening of the second orifice passage on the side of the equilibrium chamber,
the output portion of the actuator and the flexible film are configured to obstruct the openings of the second orifice passage and the third orifice passage on the side of the equilibrium chamber by means of the output portion of the actuator coming into contact against the partition member via the flexible film so that
a first portion of the flexible film that obstructs the opening of the third orifice passage on the side of the equilibrium chamber is not deformable and the third orifice passage is blocked from the equilibrium chamber, while a second portion of the flexible film that obstructs the opening of the second orifice passage on the side of the equilibrium chamber is permitted to deform owing to the center recess so that the second orifice passage is blocked from the equilibrium chamber and produces a fluid flowing through the second orifice passage owing to deformation of the second portion of the flexible film, and
the output portion of the actuator and the flexible film are configured to be separated from the openings of the second orifice passage and the third orifice passage on the side of the equilibrium chamber by means of the output portion of the actuator being separated from the partition member so that the second orifice passage and the third orifice passage are both placed in a communicating state.

2. The fluid-filled vibration damping device according to claim 1 , wherein a resonance frequency of a fluid flowing through the third orifice passage is set to a higher frequency than a resonance frequency of a fluid flowing through the first orifice passage.

3. The fluid-filled vibration damping device according to claim 1 , wherein
with the output portion of the actuator being in contact against the partition member via the flexible film, a resonance frequency of a fluid flowing through the first orifice passage is a low frequency that corresponds to an automotive engine shake while a resonance frequency of the fluid flowing through the second orifice passage owing to deformation of the second portion of the flexible film is a high frequency that corresponds to an automotive driving rumble, and
with the output portion of the actuator separated from the partition member, a resonance frequency of a fluid flowing between the pressure-receiving chamber and the equilibrium chamber is a midrange frequency that corresponds to an automotive idling vibration.

4. The fluid-filled vibration damping device according to claim 1 , wherein the flexible film includes: a thin-walled deformation permission portion constituted by the second portion of the flexible film that faces the opening of the second orifice passage on the side of the equilibrium chamber; and an obstruction retaining portion that is thicker than the deformation permission portion constituted by the first portion of the flexible film that faces the opening of the third orifice passage on the side of the equilibrium chamber.

5. The fluid-filled vibration damping device according to claim 1 , wherein the output portion of the actuator includes an air channel that penetrates a peripheral wall of the center recess, and the output portion is arranged such that a formation part of the air channel has a smaller diameter than a part facing the opening of the third orifice passage on the side of the equilibrium chamber.

6. The fluid-filled vibration damping device according to claim 1 , wherein the actuator comprises a pneumatic actuator that includes a working air chamber whose air pressure is modifiable and in which the output portion is displaced depending on changes of the air pressure within the working air chamber.

7. The fluid-filled vibration damping device according to claim 1 , wherein the output portion of the actuator includes an air channel that penetrates a peripheral wall of the center recess, and the air channel extends in a direction orthogonal to a motion direction of the actuator so that an opening of the air channel is not opposite to the flexible film in the motion direction of the actuator.

8. The fluid-filled vibration damping device according to claim 1 , wherein the output portion of the actuator includes a reinforcing member embedded therein, the reinforcing member having a tubular shape with a bottom, whose opening end is outwardly bent so as to integrally form a contact flange, and in a diametrically center section of the output portion, the central recess opens upward utilizing a shape of the reinforcing member embedded therein,
wherein with the output portion of the actuator being in contact against the partition member via the flexible film, the first portion of the flexible film is pressed against the opening of the third orifice passage on the side of the equilibrium chamber by the contact flange of the reinforcing member, and
wherein with the output portion of the actuator being in contact against the partition member via the flexible film, an opening of the center recess and the opening of the second orifice passage on the side of the equilibrium chamber are covered and obstructed by the second portion of the flexible film.

9. The fluid-filled vibration damping device according to claim 1 , wherein a stopper protrusion projects upward from a bottom of the center recess so that a level of deformation of the second portion of the flexible film is limited by a contact of the second portion of the flexible film against the stopper protrusion.

Assignees

• Tokai Rubber Ind Ltd
• Sumitomo Riko Co Ltd

Inventors

• Yasuda Takayoshi
• Ichikawa Hiroyuki
• Saiki Akio

Classifications

• F16F13/268 Primary

  comprising means for acting dynamically on the walls bounding an equilibration chamber (F16F13/264 take precedence) · CPC title

• F16F13/107

  Passage design between working chambers · CPC title