Vibration damper

Abstract

The present invention can effectively attenuate and absorb an auxiliary vibration even in the case that the auxiliary vibration input along a direction approximately orthogonal to a main vibration input along an axial direction of the apparatus, in addition that it is possible to effectively attenuate and absorb the main vibration while suppressing an engagement of a size of the apparatus. In a vibration proofing apparatus (210), two second pressure receiving liquid chambers (302A, 302B) are arranged between an outer tube (224) and a mounting attachment (226), and two second pressure receiving liquid chambers (302A, 302B) are communicated with an auxiliary liquid chamber (272) through two second orifices (308A, 308B). Accordingly, if an auxiliary vibration along an auxiliary amplitude direction orthogonal to an axial direction is input to the mounting attachment (226) from an engine side, a rubber elastic body (222) is elastically deformed along an auxiliary amplitude direction, and expands and contracts an internal volume of the second pressure receiving liquid chambers (302A, 302B), and the liquid circulates in the second pressure receiving liquid chambers (302A, 302B) and the auxiliary liquid chamber (72) with each other through the second orifices (308A, 308B). At this time, since a resonance phenomenon is generated in the liquid circulating between the second pressure receiving liquid chambers (302A, 302B) and the auxiliary liquid chamber (272) through the second orifices (308A, 308B) in synchronization with the input auxiliary vibration, it is possible to particularly effectively absorb a low-frequency vibration input along the auxiliary amplitude direction due to a pressure change, a viscous resistance and the like generated together with the resonance phenomenon of the liquid.

Description

technical field [0001] The present invention relates to a liquid-enclosed type anti-vibration device that absorbs vibration from a vibration-generating part such as an engine and prevents vibration from being transmitted to a vibration-receiving part such as a vehicle body, which is used as an engine mount on a general industrial machine or an automobile. Background technique [0002] For example, an anti-vibration device as an engine mount is arranged between the engine as the vibration generating part of the vehicle and the vehicle body as the vibration receiving part. The vibration isolating device absorbs the vibration generated by the engine and absorbs the vibration transmitted to the vehicle body Attenuation absorption. As such an anti-vibration device, there is known a liquid-enclosed type anti-vibration device in which an elastic body, a pressure-receiving liquid chamber, and a sub-liquid chamber are provided inside the device, and these liquid chambers communicate ...

AI Technical Summary

Problems solved by technology

[0006] However, in the anti-vibration device of the above-mentioned Patent Document 1, if the internal volumes of the plurality of peripheral fluid chambers are to be sufficiently large, the thickness of the partition wall portion of the elastic body that divides these peripheral fluid chambers will become thinner, and it is difficult to make the inner volume of the plurality of peripheral fluid chambers sufficiently large. The flow path of the orifice on the bulkhead is long enough

Therefore, the anti-vibration device of Patent Document 1 has the problem that if the size of the device is enlarged, it is difficult to adjust the length of the flow path of the orifice communicating with the peripheral liquid chamber so that it is compatible with the vibration of a relatively low frequency (for example, 10 Hz or less). (Auxiliary vibration) Correspondingly, when the vibration input in the left-right direction or front-rear direction of the vehicle is a relatively low frequency, such vibration cannot be effectively damped and absorbed

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