Power assistance for vehicle steering mechanisms

Details Power assistance for vehicle steering mechanisms Power assistance for vehicle steering mechanisms

1989-05-16

1991-01-22

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180150, 74 182, 74422, 74388PS, 4151521, 415910, B62D 516

Patent

active

049863827

ABSTRACT:
In a power assistance system for a vehicle steering mechanism fluid pressure providing the assistance is supplied from a pump driven intermittently by an infinitely-variable electric motor. For a rack and pinion mechanism fluid pressure chambers are formed by sealing boots at each end of the rack, and are connected through the pump, which is operative to create a pressure differential between the chambers, and thus across the rack to provide power assistance. The electric motor is energized as required to drive the pump in the appropriate direction, and when the motor and pump are inoperative fluid is allowed to flow freely between the chambers to accommodate fluid displacement as a result of unassisted operation of the steering. The pump is preferably a turbine pump, which allows fluid flow when inoperative. The system provides power assistance efficiently, and relatively cheaply.

REFERENCES:
patent: 4646868 (1987-03-01), Rosell
patent: 4728260 (1988-03-01), Ishii

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