Fluid handling – Systems – Multi-way valve unit
Patent
1997-09-24
1999-08-03
Rivell, John
Fluid handling
Systems
Multi-way valve unit
91375A, 180422, 180441, B26D 509, B26D 5083
Patent
active
059311959
ABSTRACT:
A motor vehicle power steering gear has a proportional control valve with a cylindrical valve member riding rotatably on a spool shaft and connected thereto through a torsion bar. Electromagnetic apparatus for varying the magnitude of the effective restoring torque of the torsion bar comprises a stationary exciting coil, an inner pole member comprising an extension of the cylindrical valve member having a plurality of outwardly facing teeth and an outer pole member fixed on the spool shaft for rotation therewith and having an equal plurality of opposing inwardly facing teeth, the teeth defining an air gap axially beside the coil. The inner pole member comprises a hub member formed in an annular cylindrical configuration extending through the coil and made of a first magnetic material having a high magnetization for a given coil current for maximum flux through the coil, and further comprises a tooth member comprising the plurality of outwardly facing teeth and formed of a second magnetic material having a smaller magnetization than the first magnetic material for the given coil current but being more easily and inexpensively formed with the teeth. The first magnetic material may be a wrought or low carbon steel; and the second magnetic material may be sintered powdered iron.
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Birsching Joel Edward
Perry Thomas Arthur
Richardson Michael Paul
General Motors Corporation
Rivell John
Schoenfeld Meredith H.
Sigler Robert M.
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