Motor vehicles – Compensating devices
Patent
1994-08-29
1995-10-03
Hill, Mitchell J.
Motor vehicles
Compensating devices
180132, 180142, 192 84PM, 310115, 310116, B62D 504, B62D 5083
Patent
active
054544394
ABSTRACT:
A motor vehicle power steering gear having a proportional control valve and an electromagnetic apparatus for varying the effective restoring torque of a torsion bar of the proportional control valve. The electromagnetic apparatus includes a cylindrical ring attached to a valve spool of the proportional control valve having "n" permanent magnets thereon with alternating radial polarity, a pole piece rigidly attached to a valve body of the proportional control valve having n/2 homopolar outer pole teeth outside of the magnet ring and n/2 homopolar inner pole teeth inside of the magnet ring in radial alignment with the outer pole teeth, and a stationary exciting coil magnetically coupled to the pole teeth. The pole teeth are grouped in n/4 symmetrically arrayed pairs. A first angle between radial centerlines of the permanent magnets is 360
. A second angle between radial centerlines of the pole teeth in each pair is greater than the first angle (360
) and less than two times the first angle (2(360
)).
REFERENCES:
patent: 4871040 (1989-10-01), Zuraski et al.
patent: 4886137 (1989-12-01), Pawlak et al.
patent: 4886138 (1989-12-01), Graber et al.
patent: 5038063 (1991-08-01), Graber et al.
patent: 5038066 (1991-08-01), Pawlak et al.
patent: 5070956 (1991-12-01), Pawlak et al.
patent: 5119898 (1992-06-01), Eckhardt et al.
Paper on Rotary Actuators by Andrzej M. Pawlak; Steve Schultz and Vineeta Gangla.
General Motors Corporation
Hill Mitchell J.
Schwartz Saul
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