Fluid-enclosed vibration isolation device

Abstract

A fluid-sealed vibration damping device having a novel configuration is adapted to exhibit an effective vibration damping effect when vibration having a frequency which is higher than a tuning frequency for a low frequency orifice path is inputted and also to prevent noise caused by operation of a high frequency device from being generated. A low frequency orifice path (100) and a high frequency orifice path (126) are formed in a partition member (48) supported by a second mounting member (14). Valve bodies (112, 116) are provided to at least one of openings of the high frequency orifice path(126), and spring means (112, 116) are provided to the valve bodies. The spring means (112, 116) separate, in an initial shape thereof, the valve bodies (112, 116) from said opening of the high frequency orifice path (126) to hold the high frequency orifice path (126) at a communicating state. When vibration is inputted, the valve bodies (112, 116) close the high frequency orifice path (126) against holding force of the spring means (112, 116).

Description

[0001] Technical field [0002] The present invention relates to a vibration isolator that can be applied to, for example, an engine mount of an automobile, and in particular, a fluid-enclosed type vibration isolator that utilizes a vibration-isolating effect based on the flow action of a fluid sealed inside. Background technique [0003] Conventionally, there is known a vibration isolator that is interposed between members constituting a vibration transmission system such as a power unit of an automobile and a vehicle body, and that connects or supports these members in vibration isolation. The vibration isolation device has a structure in which a first mounting part is elastically connected to a second mounting part by using a rubber elastic body of the main body. on another component of the system. In addition, as one type of vibration isolator, a fluid-enclosed type vibration isolator utilizing the flow action of an incompressible fluid sealed inside has also been propose...

AI Technical Summary

Problems solved by technology

[0006] However, in the fluid-filled vibration isolator disclosed in Patent Document 1, since the movable plate is housed in the hard casing (partition member), there is a problem that the movable plate is moved along the plate thickness direction. Collision with the partition member due to slight displacement, producing impact sound

In particular, in Patent Document 1, since the movable plate is housed and arranged with a gap in the thickness direction with respect to the case, the impact sound of the movable plate tends to be a problem.

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