Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1998-10-14
2000-07-04
Ellis, Christopher P.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91375R, 13762521, 13762523, 180441, F15B 910
Patent
active
060822422
ABSTRACT:
A power steering system which minimizes control flow supplied to a valve mechanism when a steering assist force is not required and thereby reduces energy loss and which also prevents a deterioration in steering feeling occurring when the control flow changes. A valve mechanism V is made up of a power cylinder control valve for controlling a control flow and distributively supplying it to a power cylinder Q and a bypass control valve for bypassing the two pressure chambers of the power cylinder C; the bypass control valve is normally closed, but while the control flow Q is being increased from a minimum flow Q.sub.1 to a flow Q.sub.2 required for an assist force the bypass control valve opens and bypasses the two pressure chambers of the power cylinder C so that the pressure difference between the pressure chambers rises more gently than the control flow and the driver does not experience a feeling of the steering wheel suddenly being taken over.
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patent: 5133384 (1992-07-01), Tabata et al.
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patent: 5471838 (1995-12-01), Suzuki et al.
Ellis Christopher P.
Kayaba Industry Co. Ltd.
Sharma Rashmi
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