Dual source hydraulic steering system

Details Dual source hydraulic steering system Dual source hydraulic steering system

1977-02-23

1979-03-06

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Plural pump units with individual or relative control

F04B 4900

Patent

active

041428420

ABSTRACT:
A method and plural embodiments of apparatus for delivering a pressure-compensated supply of fluid to a hydraulic steering circuit, wherein first and second pumps are respectively operated by a vehicle engine and by a ground wheel when the vehicle is in motion, output fluid from the two pumps being simultaneously directed to the steering circuit by a control valve with inlet relief valve means modulating output pressure of the sources in response to operation of the control valve. One embodiment contemplates dual inlet relief valves for separately modulating output from the two pumps while another embodiment contemplates one of the pumps having a variable output.

REFERENCES:
patent: 2624321 (1953-01-01), Levetus
patent: 2892312 (1959-06-01), Allen et al.
patent: 3093081 (1963-06-01), Budzich
patent: 3467126 (1969-09-01), Ballard et al.
patent: 3587237 (1971-06-01), Pierrat
patent: 3908374 (1975-09-01), Habiger
patent: 3911942 (1975-10-01), Becker

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