Title: Auxiliary power steering for motor vehicles

Abstract: A dual hydraulic circuit arrangement is provided each comprising essential elements of an independent booster steering system, each having valving mechanisms for steering control wherein the valving mechanisms pressurize and exhaust the power cylinder of the respective circuit. The valving mechanisms are operable in a sequential order so that initially and ordinarily one power cylinder effects steering, but in the event of failure or very heavy requirement the second power cylinder is capable of operating the steering mechanism or of assisting in such operation. It is contemplated that the pump of the initially operative circuit is engine driven and the pump of the other or emergency circuit is driven by the vehicle wheels. Thus, in the event of vehicle engine failure, the emergency power circuit can effect steering as long as the vehicle is moving. On the other hand, when heavy steering load is encountered, as in parking, both circuits are operative.

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Inventors: Jablonsky, Erich (Boebingen, DE, US)

Application Number: 918422
Filing Date: 1978-06-23
Publication_date: 1980-02-19
Assignee: Zahnradfabrik Friedrichshafen AG (Freidrichshafen, DE)
Primary Class(es): 180/406 60/405, 91/375A
Other Classes:
US Patent Ref:

3602327	Aug, 1971	Garrison	180/133.
3822759	Jul, 1974	Sheppard	180/133.
3855904	Dec, 1974	Jablonsky	91/372.
3927604	Dec, 1975	Jablonsky	91/375.
3939757	Feb, 1976	Jablonsky	91/375.
4006792	Feb, 1977	Bundschuh	180/143.
4012993	Mar, 1977	Jablonsky	91/375.
4114720	Sep, 1978	Ericson et al.	60/405.

Other Refs: 1133642

Jul, 1962	DE

Primary Examiner: Peters, Jr., Joseph F.
Assistant Examiner: Schrecengost, Randall A.
Attorney: Zalkind & Shuster