Brakes – Internal-resistance motion retarder – Valve structure or location
Patent
1989-04-05
1990-10-23
Reger, Duane A.
Brakes
Internal-resistance motion retarder
Valve structure or location
188280, F16F 9348
Patent
active
049644939
ABSTRACT:
A shock absorber is provided a piston stroke dependent variable shock absorbing characteristics by means of a first and second flow restriction valves associated with a piston. The first and second flow restriction valves are arranged in a fluid path for communicating first and second working chambers defined within a shock absorber cylindrical housing in series. The first flow restriction valve is associated with an orifice forming a part of the fluid path and has variable flow restriction rate in response to a pressure difference between the first and second chambers greater. The second flow restriction means is disposed in tandem fashion with the first flow restriction valve for providing a predetermined constant flow restriction rate in response to the pressure difference smaller than a predetermined criterion and providing a variable flow restriction as a function of the piston stroke speed in response to the pressure difference greater than the predetermined criterion.
REFERENCES:
patent: 4076276 (1978-02-01), Wijnhoven et al.
patent: 4352417 (1982-10-01), Stinson
patent: 4460074 (1984-07-01), Muller et al.
patent: 4610332 (1986-09-01), Mourray
Sasaki Mitsuo
Yamaoka Fumiyuki
Yamaura Tamotsu
Atsugi Motor Parts Company Limited
Reger Duane A.
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