Fully metered compensating steering system

Details Fully metered compensating steering system Fully metered compensating steering system

B - Operations, Transporting

62

D

180/55

B62D 5/00 (2006.01) B62D 5/09 (2006.01) B62D 5/32 (2006.01)

Patent

CA 1274780

FULLY METERED COMPENSATING STEERING SYSTEM Abstract of the Disclosure A power steering system for positioning the steerable wheels of a vehicle that provides increased handling feedback to the operator via the steering wheel. The system uses a motor driven pump and a bidirectional hand pump to supply and control fluid pressure for steering the wheels. Two pairs of servomotors steer the vehicle with a first pair receiving a regulating amount of fluid from the bidirectional hand pump and a second pair primarily receiving fluid pressure for moving the steerable wheels from the motor driven pump. In order to increase roadability during selected steering manuevers and change the steering ratio a compensating valve decreases fluid pressure from the power pump to the second pair of servomotors in response to an operator controlled condition such as turning angle or vehicle speed. The system can also be arranged to have a maximum ratio which will facilitate steering in the absence of fluid pressure from the motor driven pump.

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