Automotive power steering gear

Details Automotive power steering gear Automotive power steering gear

1991-06-25

1993-02-16

Marmor, Charles A.

Motor vehicles

Surface effect vehicles

Dynamic seal or fluid curtain

180146, 180148, 91436, B62D 5083

Patent

active

051862727

ABSTRACT:
An automotive power steering gear having a four-way, open-center valve defining inlet branch passages between an inlet port of the steering gear and opposite working chambers of a steering assist fluid motor and further defining discharge branch passages between the opposite fluid motor working chambers and a discharge port of the steering gear. Lands and grooves on a spool and a sleeve of the valve define variable orifices in the inlet and discharge branch passages. The steering gear further includes bypass passages around each of the variable orifices in the inlet branch passages and check valves in the bypass passages which open the passages only when the pressure in the corresponding one of the fluid motor working chambers exceeds the pressure at the inlet port. When one or the other of the check valves is open, fluid recirculates from one of the fluid motor working chambers to the other.

REFERENCES:
patent: 4367803 (1983-01-01), Wittren
patent: 4405030 (1983-09-01), Wittren
patent: 4558759 (1985-12-01), Baatrup et al.
patent: 4768604 (1988-09-01), Schipper
patent: 4774807 (1988-10-01), Pedersen
patent: 4830131 (1989-05-01), Miyoshi et al.

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