Hydraulic power steering apparatus

Details Hydraulic power steering apparatus Hydraulic power steering apparatus

2006-12-05

2006-12-05

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C091S386000

Reexamination Certificate

active

07143683

ABSTRACT:
A control valve controls hydraulic pressure of oil supplied to a hydraulic actuator for generating steering assist power, based on elastic relative rotation between input and output shafts. A restricting device restricts relative rotation between input and output shafts based on a driving condition of the vehicle, and adjusts the hydraulic pressure for pressing the input shaft via a plunger inserted into a guide bore formed in the output shaft, based on the driving condition of the vehicle by the hydraulic pressure adjustment mechanism. The plunger is guided by the inner circumference of the guide bore along the direction that the plunger approaches to and goes away from the output shaft when the input and output shafts relatively rotate. A friction reducing element is interposed between the inner circumference of the guide bore and the outer circumference of the plunger.

REFERENCES:
patent: 4796715 (1989-01-01), Futaba et al.
patent: 5058696 (1991-10-01), Prebay et al.
patent: 5070957 (1991-12-01), Harkrader et al.
patent: 5190119 (1993-03-01), Nomura et al.
patent: 5233906 (1993-08-01), Bishop et al.
patent: 5452642 (1995-09-01), Dymond
patent: 5575193 (1996-11-01), Bareis et al.
patent: 0818380 (1998-01-01), None
patent: 2509939 (1996-06-01), None

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