Motor vehicles – Steering gear – With electric power assist
Patent
1996-07-01
1998-05-12
Johnson, Brian L.
Motor vehicles
Steering gear
With electric power assist
310115, 310116, 192 8431, B62D 504, B62D 5083
Patent
active
057494320
ABSTRACT:
A motor vehicle power steering gear has a proportional control valve with first and second valve members connected by a torsion spring and defining a center position with zero torque in the torsion spring. Electromagnetic apparatus for varying the magnitude of the effective restoring torque of the torsion spring comprises a stationary exciting coil, a circular permanent magnet member connected to one of the first and second valve members for rotation therewith and comprising a plurality (n) of permanent magnets of alternating radial polarity, and a pole piece connected to the other of the first and second valve members for rotation therewith, magnetically coupled to the exciting coil, and having a pair of magnetic flux conducting rings each defining a plurality (n/2) of pole teeth facing the permanent magnet member and opposing the pole teeth of the other to define pole tooth pairs each having a region of circumferential overlap. The permanent magnet member is rotationally oriented, with the first and second valve members in the center position, in a position of zero electromagnetic torque with no current in the exciting coil and with alternate ones of the boundaries separating the permanent magnets aligned substantially at the centers of the regions of circumferential overlap of successive pole tooth pairs, whereby electric current through the exciting coil provides substantial torque between the first and second valve members at and around the center position. Valve angle sensing apparatus provides a signal for controlling current through the exciting coil to provide a steering preload.
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: 5070956 (1991-12-01), Pawlak et al.
patent: 5119898 (1992-06-01), Eckhardt et al.
patent: 5412530 (1995-05-01), Shimizu
patent: 5454439 (1995-10-01), Birsching
patent: 5492191 (1996-02-01), Birsching
patent: 5677581 (1997-10-01), Yoshida et al.
General Motors Corporation
Johnson Brian L.
Savitt Gary
Sigler Robert M.
LandOfFree
Power steering gear for motor vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power steering gear for motor vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power steering gear for motor vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-973060