Vehicle steering system

Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element

Patent

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Details

60387, B62D 504, B62D 5097

Patent

active

049729160

ABSTRACT:
A vehicle steering system having more than one set of steerable wheels includes a hydrostatic steering unit connected in fluid communication with actuatable hydraulic steering motors operatively coupled with one set of wheels. The hydraulic steering motors are actuated when hydraulic fluid is applied thereto. Steering movement of the one set of wheels is effected in response to actuation of the hydraulic steering motors. The hydrostatic steering unit has an input shaft drivingly connected with an output shaft of an electric motor. The speed and direction of rotation of the output shaft of the electric motor, and hence the speed and direction of rotation of the input shaft of the hydrostatic steering unit, is controlled in response to a control output signal from a microcomputer. The control output signal from the microcomputer is generated in response to the magnitude and direction of steering torque applied to the steering wheel, the vehicle speed, and the positions of the sets of steerable wheels. The flow of the hydraulic fluid to the hydraulic steering motors is proportional to the rotational speed of the input shaft of the hydrostatic steering unit. The direction of the hydraulic fluid flow depends upon the direction of rotation of the input shaft of the hydrostatic steering unit.

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Perlini 131-33.

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