Brakes – Internal-resistance motion retarder – Relative speed of thrust member or fluid flow
Patent
1989-07-07
1992-01-07
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Relative speed of thrust member or fluid flow
188299, 18832222, F16F 949, F16F 946
Patent
active
050782398
ABSTRACT:
A shock absorber which selectively produces different magnitudes of damping forces includes a cylinder and a piston slidably disposed in the cylinder and dividing an interior space of the cylinder into first and second fluid chambers filled with a fluid. A housing assembly coupled to the piston has a main fluid passage providing fluid communication between the first and second fluid chambers at all times and an auxiliary fluid passage providing selective fluid communication between the first and second fluid chambers. The auxiliary fluid passage can be opened to provide fluid communication between the first and second fluid chamber in response to an external control signal. The auxiliary fluid passage can be closed to cut off fluid communication between the first and second fluid chambers when the speed of relative movement of the cylinder and the piston is substantially zero, i.e., when the speed of expansion and contraction of the shock absorber is substantially zero.
REFERENCES:
patent: 3043404 (1962-07-01), Peras
patent: 4084667 (1978-04-01), Kurrat
patent: 4620619 (1986-11-01), Emura et al.
patent: 4696489 (1987-09-01), Fujishiro et al.
patent: 4723640 (1988-02-01), Beck
patent: 4729459 (1988-03-01), Inagaki et al.
Hagiwara Yasumasa
Ishida Toshinobu
Kobayashi Toshiki
Yano Masayuki
Nippon Soken Inc.
Nippondenso Co. Ltd.
Oberleitner Robert J.
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