Hydraulic package type antivibration device and elastic partition membrane and sandwiching members for use in the same

Abstract

A liquid-sealed vibration isolator in which noise can be reduced greatly at the time of a high amplitude input while maintaining both the low dynamic spring characteristic at the time of a low amplitude input and the high attenuation characteristic at the time of a large amplitude input. In this liquid-sealed vibration isolator (100), since an elastic partition membrane (15) is restricted by displacement regulation ribs (17, 19) to regulate the displacement thereof, and openings (54, 56) are provided as clearance parts of the elastic partition membrane (15), noise can be reduced greatly at the time of a high amplitude input while maintaining both the low dynamic spring characteristic at the time of a low amplitude input and the high attenuation characteristic at the time of a high amplitude (intermediate amplitude) input.

Description

technical field [0001] The present invention relates to a liquid-encapsulated anti-vibration device and an elastic separation film and a clamping member used in the liquid-enclosed anti-vibration device. Background technique [0002] A liquid-encapsulated anti-vibration device is known as an anti-vibration device that supports and fixes the engine of an automobile while preventing the vibration of the engine from being transmitted to the vehicle frame. [0003] In general, in a liquid-enclosed anti-vibration device, the first mounting member mounted on the engine side and the second mounting member mounted on the frame side are connected by a main vibration-isolating body made of a rubber-like elastic body. connected, and a liquid sealing chamber is formed between the diaphragm installed on the second mounting part and the main anti-vibration body, and the liquid sealing chamber is divided into the first and second liquid chambers by the separator, and the first and second ...

AI Technical Summary

Problems solved by technology

[0006] However, in the case of the elastic membrane structure, although the noise problem described later does not occur, since the rigidity of the elastic membrane is constant and has nothing to do with the magnitude of the vibration amplitude, if it is input with a small amplitude, it has low dynamic spring characteristics, Then when a large amplitude is input, the hydraulic pressure difference between the two liquid chambers is easily relieved by the elastic diaphragm

Therefore, the effect of the fluid flow cannot be fully exerted, and there is a problem that the attenuation characteristic is significantly lowered.

[0007] On the other hand, in the case of the movable membrane structure, although the low dynamic spring characteristics when the input amplitude is small and the high attenuation characteristics when the input amplitude is large, it is a structure in which the elastic separation membrane is in contact with the displacement limiting member, so there is a problem. There is a problem that the displacement restricting member vibrates at the time of such abutment, and the vibration is transmitted to the vehicle frame to generate noise.

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