Two pump power steering system

Details Two pump power steering system Two pump power steering system

1991-09-27

1993-11-02

Pape, Joseph D.

Motor vehicles

Surface effect vehicles

Dynamic seal or fluid curtain

180132, B62D 508

Patent

active

052576701

ABSTRACT:
An apparatus provides hydraulic fluid for power steering assistance for steering a vehicle. A valve controls flow of hydraulic fluid from a first, engine driven, pump and a second, wheel driven, pump. The valve includes a valve housing and a valve member. The valve member is movable relative to the valve housing in response to a pressure differential in the hydraulic fluid from the first pump. The valve member in one range of relative positions provides a first flow passage from the first pump toward a steering valve, provides a variable second flow passage from the first pump toward the steering valve, and blocks hydraulic fluid flow from the second pump toward the steering valve. The first and second flow passages are in fluid parallel. The valve member in a control position provide a third flow passage from the second pump to the steering valve.

REFERENCES:
patent: 3747725 (1973-07-01), Feustel et al.
patent: 4237993 (1980-12-01), Jablonsky
patent: 4303089 (1981-12-01), Gage et al.
patent: 4553389 (1985-11-01), Tischer et al.
patent: 4798256 (1989-01-01), Fassbender

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