Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1989-07-31
1990-06-26
Reger, Duane A.
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
267219, F16F 500
Patent
active
049365550
ABSTRACT:
A bush-type vibration damping device having an inner cylinder and an outer cylinder arranged in such a way that their axes extend in parallel with each other, and an elastic member is interposed between the inner and outer cylinders. A pressure receiving chamber, a first sub-liquid chamber and a second sub-liquid chamber are provided at one side of the inner cylinder. The first sub-liquid chamber has a not smaller resistance to expansion by pressure than the second sub-liquid chamber. The first and second sub-liquid chambers are connected to the pressure receiving liquid chamber through first and second communication passages, respectively. The second communication passage produces a not smaller resistance to flowing liquid than the first communication passage. Vibration of a comparatively low frequency and large amplitude is adsorbed by the flow resistance encountered by a liquid displaced through the second communication passage, while vibration of a comparatively high frequency and small amplitude causes a resonance of the liquid in the first passage so as to limit increase in the dynamic spring constant.
REFERENCES:
patent: 4840357 (1989-06-01), Jouade
Aihara Toshihiko
Ishiyama Tatsuro
Tabata Toshiyuki
Takeguchi Hajime
Ushijima Takao
Bridgestone Corporation
Nissan Motor Co,. Ltd.
Reger Duane A.
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