Rear-wheel steering apparatus

Details Rear-wheel steering apparatus Rear-wheel steering apparatus

1986-10-30

1989-03-14

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180141, 180143, 180158, 280 91, B62D 5087

Patent

active

048118052

ABSTRACT:
A rear-wheel steering apparatus includes a steering unit for steering the front wheels in association with a rotation of the steering wheel, and a hydraulic actuator for steering the rear wheels. The actuator has first and second hydraulic chambers and a drive member connected to the rear wheels and operating in accordance with an oil pressure supplied to the hydraulic chambers. A directional control valve is provided between the steering unit and the actuator. The valve supplies oil pressure to the actuator in association with the operation of the steering unit. The valve includes a casing, and a valve body slidably arranged in the casing. First and second pressure chambers filled with oil pressure are defined in the casing. When the steering angle of the front wheels is smaller than a predetermined angle, the valve body moves to an in-phase position for supplying oil pressure to the actuator so that the rear wheels are steered in the same direction as the front wheels. When the steering angle is larger than the predetermined angle, the valve body moves to an antiphase position for supplying oil pressure to the actuator so that the rear wheels are steered in the direction opposite to the steering direction of the front wheels.

REFERENCES:
patent: 3185245 (1965-05-01), Hoyt
patent: 4295657 (1981-10-01), Sano et al.
patent: 4534435 (1985-08-01), Shibahata et al.

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