Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1989-02-23
1989-10-03
Marmor, Charles A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180143, 180 791, B62D 504
Patent
active
048710407
ABSTRACT:
A hydraulic power steering system having conventional relatively rotatable spool and valve body elements for flow regulation, and an integral electromagnetic mechanism which effectively varies the centering force between the spool and valve body to adjust the level of steering assist provided for a given operator steering input. The electromagnetic mechanism includes a rotary magnetic circuit and a stationary magnetic circuit. The rotary magnetic circuit comprises a pair of axially displaced magnetic pole pieces which rotate with the pinion shaft and a permanent magnet disk element which is disposed between the pole pieces and which rotates with the input shaft. The stationary magnetic circuit includes an annular exciting coil disposed about the rotary magnetic circuit and ferromagnetic pole elements adjacent each of the rotary pole pieces. The exciting coil is energized so as to vary the valve body/spool centering force, and hence the driver steering effort, with vehicle speed.
REFERENCES:
patent: 4629025 (1986-12-01), Braiser et al.
patent: 4765427 (1988-08-01), Yonker
patent: 4778021 (1988-10-01), Morishita et al.
patent: 4783626 (1988-11-01), Shimizu
Babineau James W.
Graber David W.
Pawlak Andrzej M.
Zuraski Jeffery A.
Camby Richard
General Motors Corporation
Marmor Charles A.
Navarre Mark A.
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