Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1987-12-28
1989-06-20
Pekar, John A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
137115, 417307, 417310, B62D 508
Patent
active
048402443
ABSTRACT:
An automatic regulator valve assembly is provided to vary fluid flow to a power steering gear in response to steering gear hydraulic pressure in order to provide optimum road feel, as well as optimum power assist throughout the range of vehicle operating conditions. The valve assembly divides the fluid flow between the steering gear and a bypass line that directs any excess fluid back to the fluid reservoir. A flow control valve in the valve assembly supplies the fluid to the steering gear, and a shuttle valve working in concert with the flow control valve serves to bypass the excess fluid. The flow control valve supplies fluid to the steering gear according to the demands of the gear itself. During low speed, high demand operation, operator steering inputs are large, requiring maximum fluid flow for optimum power assist. As vehicle speed increases and demand decreases, steering inputs decrease proportionally. As steering inputs decrease, fluid flow requirements also decrease. Accordingly, the flow control valve supplies less fluid to the steering gear, allowing more fluid to bypass to the reservoir.
REFERENCES:
patent: 3367354 (1968-02-01), Gallant
patent: 3693747 (1972-09-01), Nishikawa
patent: 4274504 (1981-06-01), Kawabata et al.
patent: 4311161 (1982-01-01), Narumi et al.
patent: 4434866 (1984-03-01), Duffy
patent: 4485883 (1984-12-01), Duffy
patent: 4600071 (1986-07-01), Kitahara et al.
Pekar John A.
R.H. Sheppard Co.
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