Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Patent
1988-12-28
1990-01-23
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
188280, 18832215, 188317, F16F 9348
Patent
active
048952290
ABSTRACT:
A hydraulic shock absorber has a disk valve assembly which is formed by successively stacking up a first disk valve having arc-shaped or circumferentially extending opening provided therein at positions close to the inner periphery thereof, a second disk valve having notches which extend from the outer periphery thereof to the radially outer edges of the corresponding openings provided in the first disk valve, and a predetermined number of annular third disk valves. A respective such disk valve assembly is provided at the downstream end of each of the extension- and contraction-side passages which are formed in a piston. Thus, it is possible to obtain a higher level of damping force in a low piston speed region than in the case of a conventional valve mechanism that uses a fixed orifice, and damping characteristics can be set as desired.
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Butler Douglas C.
Tokico Ltd.
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