Four wheel steering system

Details Four wheel steering system Four wheel steering system

1988-09-02

1989-08-29

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180141, 280 91, B62D 506

Patent

active

048608459

ABSTRACT:
A closed hydraulic system (22 or 200) is provided for transmitting steering movement to a rear wheel steering assembly (16) in response to steering movment of a front wheel steering assembly (14). The front wheel steering assembly is controlled by a steering wheel (18) and a power steering assembly (20). The closed hydraulic system (22) includes a pump assembly (50) and an actuator assembly (52) connected together by conduits to define closed fluid flow branches (104,106) for moving a piston (90) in the actuator assembly in response to movement of a piston (72) in the pump assembly. In one embodiment (22) movement of the actuator piston is transmitted to the rear wheel steering assembly via a cam assembly which effects same direction rear wheel steering for rather small front wheel steering angles and which effects opposite direction rear wheel steering for greater front wheel steering angles. In another embodiment (200), the actuator piston (214) is connected directly to the rear wheel steering assembly. Both embodiments include a make-up valve (66) connected to an accumulator functioning as a reservoir to replace system fluid lost by leakage. The system embodiment (200) is provided with a valve for reversing fluid flow from the pump to the actuator to enable the actuator to provide same and opposite direction rear wheel steering relative to the front wheels.

REFERENCES:
patent: 4776418 (1988-10-01), Winckler
patent: 4776419 (1988-10-01), Walton

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