Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1991-11-12
1992-08-04
Hill, Mitchell J.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
60384, 81375A, 81467, 180142, 180143, 180149, B62D 506
Patent
active
051350688
ABSTRACT:
A hydraulic reaction device of a power steering apparatus includes a vehicle-speed responsive pump, a reaction plunger, a hydraulic reaction chamber, a path, and a variable control unit. The vehicle-speed responsive pump has a pressure oil discharge flow rate which changes in accordance with a vehicle speed. The reaction plunger selectively constraining relative pivotal displacement between input and output shafts constituting a rotary flow path switching valve of the power steering apparatus. The hydraulic reaction chamber receives the pressure oil from the pump to apply a reaction oil pressure to the reaction plunger. The path is arranged to connect the hydraulic reaction chamber to a tank. The variable control unit (a variable throttle portion 37 of a reaction oil pressure control valve 11) for variably controlling a flow rate of the pressure oil flowing through the path. The variable control unit is variably controlled in accordance with a magnitude of an oil pressure in a main oil pressure path extending from a main pump to the left and right chambers of the power cylinder.
REFERENCES:
patent: 3744515 (1973-07-01), Inoue
patent: 4621704 (1986-11-01), Kozuka
patent: 4644846 (1987-02-01), Kozuka
patent: 4848500 (1989-07-01), Komine et al.
patent: 4877100 (1989-10-01), Emori et al.
Emori Yasuyoshi
Minamibata Yukimitsu
Hill Mitchell J.
Jidosha Kiki Co. Ltd.
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