Fluid-filled vibration-damping device

Abstract

Provided is a fluid-filled vibration-damping device having a novel structure, the fluid-filled vibration-damping device being capable of achieving enhanced vibration-damping performance using a simpleand compact structure. This fluid-filled vibration-damping device 10 is configured such that: a pressure-receiving chamber 70 filled with a noncompressible fluid and a balance chamber 72 are in communication with each other through an orifice passage 74; and the fluid-filled vibration-damping device 10 is provided with a relief mechanism 62 which, owing to the effect of negative pressure generated in the pressure-receiving chamber 70 by the input of an impact load, opens a short-circuit passage 77 to connect the pressure-receiving chamber 70 to the balance chamber 72, thereby preventing cavitation. The short-circuit passage 77 portion of the relief mechanism 62 is provided with a leakage passage 78 which, even in a state in which the short-circuit passage 77 is not open, maintains the communication between the pressure-receiving chamber 70 and the balance chamber 72 through a passage cross-section smaller than that of the orifice passage 74.

Description

Technical field [0001] The present invention relates to an anti-vibration device suitable for an engine mount of an automobile, and more particularly to a fluid-enclosed anti-vibration device that utilizes an anti-vibration effect based on the flow of an incompressible fluid enclosed therein. Background technique [0002] Conventionally, as one of the vibration-proof devices applied to the engine mounts of automobiles, the following fluid-enclosed vibration-proof devices are known: as disclosed in Japanese Patent Application Laid-Open No. 2015-102168 (Patent Document 1), etc. This fluid-enclosed anti-vibration device is provided with a pressure receiving chamber and a balance chamber in which an incompressible fluid is sealed, and is provided with a throttle passage that communicates the pressure receiving chamber and the balance chamber with each other. [0003] In addition, in Patent Document 1, an overflow unit is provided. When a negative pressure is generated in the pressure r...

AI Technical Summary

Problems solved by technology

Further, although in the structure of Patent Document 1, the switching passage is cut off by elastically deforming the switching valve when the vibration of the frequency at which the throttle passage is tuned is input, in the switching mechanism as described above, since the cutting of the switching passage is relatively There is a slight delay due to the input, so it is possible to achieve further improvement in anti-vibration performance, stabilization, etc. by switching the switching path on and off more quickly

Images