Controllable damping force hydraulic shock absorber

Details Controllable damping force hydraulic shock absorber Controllable damping force hydraulic shock absorber

2005-03-01

2005-03-01

Siconolfi, Robert A. (Department: 3683)

Brakes

Internal-resistance motion retarder

Resistance alters relative to direction of thrust member

C188S282600, C188S322130

Reexamination Certificate

active

06860370

ABSTRACT:
A piston having a piston rod connected thereto is slidably fitted in a cylinder in which a hydraulic fluid is sealably contained. Extension-stroke and compression-stroke pilot type damping force control mechanisms are provided in the piston. Check valves are provided at inlet openings of back-pressure chambers (pilot chambers). Relief valves provided in the pilot chambers include orifice passages. When the direction of stroke of the piston rod is reversed, the pressures in the back-pressure chambers are maintained due to the check valves, and the back-pressure chambers are pressurized to a satisfactory level through the orifice passages.

REFERENCES:
patent: 6332622 (2001-12-01), Nakamura et al.
patent: 6371262 (2002-04-01), Katou et al.
patent: 6374967 (2002-04-01), Matsumoto et al.
patent: 6474454 (2002-11-01), Matsumoto et al.

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