Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1993-07-26
1994-05-10
Oberleitner, Robert J.
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
26714015, 267219, 188299, F16F 1300
Patent
active
053101693
ABSTRACT:
A vibration isolating apparatus. A first diaphragm and a second diaphragm form portions of partitioning walls of a first sub-liquid chamber and a second sub-liquid chamber, respectively, and are provided so as to permit expansion of the first sub-liquid chamber and the second sub-liquid chamber. A first restricting passage always communicates a main liquid chamber and the first sub-liquid chamber. A second restricting passage is provided so as to permit communication of the main liquid chamber and one of the first sub-liquid chamber and the second sub-liquid chamber and has a smaller liquid transit resistance than that of the first restricting passage. A third restricting passage is provided so as to permit communication of the main liquid chamber and the second sub-liquid chamber and has a smaller liquid transit resistance than that of the second restricting passage. A restricting passage opening and closing device opening and closing the second restricting passage and the third restricting passage in accordance with a frequency of a vibration generated from the vibration generating portion, and is provided such that a first state, in which the second restricting passage is closed and the third restricting passage is open, and a second state, in which the third restricting passage is closed and the second restricting passage is open, are possible.
REFERENCES:
patent: 5029825 (1991-07-01), Doi
patent: 5180148 (1993-01-01), Muramatsu
Bridgestone Corporation
Oberleitner Robert J.
Young Lee W.
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