Brakes – Internal-resistance motion retarder – Relative speed of thrust member or fluid flow
Patent
1989-09-27
1991-08-27
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Relative speed of thrust member or fluid flow
188282, 188317, 18832214, 18832215, 18832222, F16F 9348
Patent
active
050426249
ABSTRACT:
A hydraulic shock absorber employs first and second stage disc valves arranged in tandem fashion. The first stage disc valve is provided for acting on a relatively small pressure difference for enhanced damping characteristics at a relatively low piston stroke speed range. On the other hand, the second stage disc valve is provided for acting on a greater pressure difference for generating damping a force at a higher piston stroke speed range. The second stage disc valve is initially pre-loaded at a predetermined magnitude of load so as to set a pressure relief point of the second stage disc valve at a desired piston stroke speed for better damping characteristics of the shock absorber.
REFERENCES:
patent: 2740500 (1956-04-01), Brundrett et al.
patent: 3134460 (1964-05-01), DeCarbon
patent: 4076276 (1978-02-01), Wijnhoven et al.
patent: 4768629 (1988-09-01), Wossner
patent: 4782925 (1988-11-01), Grundei
patent: 4809828 (1989-03-01), Nakazato
patent: 4834222 (1989-05-01), Kato et al.
patent: 4895229 (1990-01-01), Kato
patent: 4905799 (1990-03-01), Yamaoka et al.
Furuya Takayuki
Yamaoka Fumiyuki
Atsugi Unisia Corporation
Butler Douglas C.
Kananen Ronald P.
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