Power steering system

Details Power steering system Power steering system

1989-09-26

1992-04-14

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

F15B 910

Patent

active

051037157

ABSTRACT:
An improved power steering system in which the ratio of output force to input torque is variable. The power steering system includes an input shaft as well as an inner valve member and an outer valve member which are able to generate hydraulic fluid pressure in response to the input torque. A rack assembly is provided for generating the output force in response to the hydraulic fluid pressure generated in response to the input torque. The improved power steering system further includes a pinion shaft which mechanically communicates with the rack assembly and provides a reference position for the improved power steering system. A torsion bar compliantly couples the inner valve member to the pinion shaft, a twist angle of the torsion bar serving to provide a position error signal to the improved power steering system. Finally, a torsion bar extension compliantly couples the torsion bar to the input shaft.

REFERENCES:
patent: 3408900 (1968-11-01), Tomita
patent: 3657967 (1972-04-01), Suzuki
patent: 3705751 (1972-12-01), Dee
patent: 4300594 (1981-11-01), Bacardit
patent: 4458580 (1984-07-01), Masuda et al.
patent: 4461321 (1984-07-01), Bacardit
patent: 4465098 (1984-08-01), Bacardit
patent: 4594936 (1986-06-01), Bacardit
patent: 4651622 (1987-03-01), Yoshida

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