Four-wheel vehicle steering apparatus

Details Four-wheel vehicle steering apparatus Four-wheel vehicle steering apparatus

1989-10-23

1992-09-15

Hill, Mitchell J.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180141, 180143, 280 91, B62D 506, B62D 5087, B62D 714

Patent

active

051470080

ABSTRACT:
A four-wheel steering apparatus for a vehicle includes a hydraulic actuator for steering the rear wheels, and first and second oil pumps. An in-phase steering control valve is connected between the first oil pump and the actuator and outputs first hydraulic output for steering the rear wheels in phase with the front wheels in accordance with a steering state of the front wheels. An antiphase steering control valve is connected between the second oil pump and the actuator and outputs second hydraulic output for steering the rear wheels in opposite phase to the front wheels in accordance with a rate of change in the steering state of the front wheels. The hydraulic actuator combines the first and second hydraulic outputs from the control valves and steers the rear wheels in accordance with the difference between the hydraulic outputs.

REFERENCES:
patent: 4730839 (1988-03-01), Miyoshi
patent: 4781262 (1988-11-01), Nakamura et al.
patent: 4811805 (1989-03-01), Yoshida et al.
patent: 4917205 (1990-04-01), Kobayashi et al.

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