Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1987-12-28
1989-06-13
Pekar, John A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
74833, 91437, 180141, 280 91, B62D 508
Patent
active
048383740
ABSTRACT:
A mechanism (47) is provided for converting rotational movement to substantially linear movement. The mechanism is adapted for incorporation into a vehicle (12) having front and rear wheel steering assemblies (14, 16) and a closed hydraulic system (22) for driving the mechanism in response to-and-fro steering movement of the front wheel steering assembly. The mechanism includes a support housing (98) rotated about an axis (93b) of a drive pinion (93) driven by the closed hydraulic system, a nut (100) threadably receiving a shaft (99) mounted for rotation by the support housing and having an axis (99c) normal to and intersecting an extension of the drive pinion axis (93b), a stepper motor for rotating the shaft to vary the position of the nut with respect to the drive pinion axis (93b), a logic (107) for energizing the motor and positioning the nut as a function of vehicle speed. In one embodiment the nut transmits substantially linear movement directly to the rear wheel steering assembly. In another embodiment, the nut operates a servo valve (208) of a hydraulic power steering system (200) for the rear wheels.
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patent: 4719981 (1988-01-01), Miyoshi
SAE Technical Paper Series 860624-Improvement of Vehicle Dynamics by Vehicle-Speed-Sensing Four-Wheel Steering System--Yasuda et al.
Hydronic Corporation Brochure-Remote Control System.
Eaton Corporation
Pekar John A.
Rulon P. S.
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