Title: Dual source hydraulic steering system

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.

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Inventors: Hicks, Leon E. (Joliet, IL, US)
Peterson, Wayne A. (Joliet, IL, US)
Schexnayder, Lawrence F. (Joliet, IL, US)

Application Number: 504055
Filing Date: 1974-09-09
Publication_date: 1976-02-03
Assignee: Caterpillar Tractor Co. (Peoria, IL)
Primary Class(es): 180/406 60/405, 180/420
Other Classes:
US Patent Ref:

3424262	Jan, 1969	Kunz	180/79.
3653209	Apr, 1972	Mac Duff	180/79.
3719249	Mar, 1973	Becker	180/79.
3838570	Oct, 1974	Marietta	180/79.

Other Refs:
Primary Examiner: Wood, Jr., M Henson
Assistant Examiner: Pekar, John A.
Attorney: Phillips, Moore, Weissenberger