Electricity: motive power systems – Electric motor with nonmotor driving means – Manual driving means
Patent
1990-06-01
1991-07-02
Ro, Bentsu
Electricity: motive power systems
Electric motor with nonmotor driving means
Manual driving means
60434, 180 62, 180132, B62D 506
Patent
active
050288512
ABSTRACT:
A vehicle steering system with power assistance means comprises an output component 4 displaceable relative to a housing 1 for that component and in response to a steering input for effecting a steering maneuver. The housing 1 is mounted for displacement relative to a frame part 9 of the vehicle. An hydraulic servo motor 13 is provided for assisting displacement of the output component 4 and reacting between the output component 4 and the vehicle frame part 9. An hydraulic pump 44 supplies working fluid to the servo motor 13 and a control valve 20 controls the supply of working fluid to the servo motor 13 in response to relative displacement between the housing 1 and the frame part 9 as a reaction to a steering maneuver and that response controls the servo motor 13 to assist the maneuver. In order to control operation of the pump 44, switch means 60 are provided, actuated by movement of the valve member 42 of the control valve 20, to energize the motor drive of the pump motor when power assistance is required.
REFERENCES:
patent: 2775132 (1956-12-01), Orr et al.
patent: 3558239 (1971-01-01), Schiber
patent: 4022220 (1977-01-01), Wible
patent: 4476677 (1984-10-01), Hanshaw
patent: 4523494 (1985-06-01), Sparks et al.
patent: 4535678 (1985-08-01), Thomsen et al.
Ro Bentsu
TRW Cam Gears Limited
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