Power steering gear for motor vehicle

Details Power steering gear for motor vehicle Power steering gear for motor vehicle

1997-06-02

1998-12-01

Boehler, Anne Marie

Motor vehicles

Steering gear

With fluid power assist

180426, 180427, 180441, B62D 500

Patent

active

058425365

ABSTRACT:
A power steering gear for a motor vehicle including a pinion head and a spool shaft rotatable relative to each other, a torsion bar between the spool shaft and the pinion head, a valve spool formed integrally on the spool shaft, a valve body closely received on the spool shaft around the valve spool and rotatable relative to the spool shaft, and a tripod joint coupling the valve body to the pinion head for unitary rotation and consisting of three equally angularly spaced slots in an end of the valve body and three equally angularly spaced radial pins on the pinion head each having a spherical lobe closely received in a corresponding one of the slots in the valve body. An inboard end of the spool shaft adjacent the pinion head is unsupported laterally on the pinion head except through the valve body and the tripod joint and, consequently, floats with the valve body in the event of lateral runout between the pinion head and the spool shaft to minimize valve hysteresis attributable to such lateral runout. In a preferred embodiment, an electromagnetic apparatus of the power steering gear varies the effective restoring force of the torsion bar.

REFERENCES:
patent: 3406773 (1968-10-01), Luther
patent: 3998131 (1976-12-01), Adams
patent: 4034825 (1977-07-01), Adams
patent: 4454801 (1984-06-01), Spann
patent: 4790401 (1988-12-01), Sonoda
patent: 4819545 (1989-04-01), Dymond
patent: 5119898 (1992-06-01), Eckhardt et al.
patent: 5230273 (1993-07-01), Fraley, Jr.
patent: 5272933 (1993-12-01), Collier et al.
patent: 5291963 (1994-03-01), Sangret
patent: 5492191 (1996-02-01), Birsching

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