Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1988-03-21
1990-04-17
Hill, Mitchell J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
91447, 91517, 180141, 180142, 280 91, B62D 5087, B62D 714
Patent
active
049172050
ABSTRACT:
A four-wheel steering system of a vehicle includes a power steering device for steering the front wheels, an oil pressure pump for generating an oil pressure in accordance with a travel speed of the vehicle, and a hydraulic actuator for steering the rear wheels. A first control valve is provided between the pump and the actuator so as to operate upon reception of the oil pressure from the power steering device. This valve introduces the oil pressure from the pump to the actuator in accordance with the oil pressure from the power steering device so that the actuator steers the rear wheels in the same direction as the front wheels. A second control valve is provided between the power steering device and the actuator so as to operate in accordance with the oil pressure from the power steering device. When the oil pressure from the power steering device exceeds a predetermined value, the second control valve operates to introduce the oil pressure from the power steering device to the actuator so that the actuator steers the rear wheels in the opposite direction to the front wheels.
REFERENCES:
patent: 3198088 (1965-08-01), Johnson et al.
patent: 3566749 (1971-03-01), Allen et al.
patent: 3572460 (1971-03-01), Beruch
patent: 4398616 (1983-08-01), Braden et al.
patent: 4441572 (1984-04-01), Ito et al.
patent: 4558631 (1985-12-01), Fassbender
patent: 4709935 (1987-12-01), Takizawa et al.
patent: 4811805 (1989-03-01), Yoshida et al.
Fukuyama Kazuo
Kobayashi Kazuyoshi
Takizawa Shozo
Hill Mitchell J.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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