Steering system

Details Steering system Steering system

2007-10-11

2011-11-29

Boehler, Anne Marie (Department: 3611)

Motor vehicles

Steering gear

No mechanical connection between steering shaft and steering...

C180S406000, C180S422000

Reexamination Certificate

active

08066091

ABSTRACT:
A steering system, comprising: an input cylinder having a first hydraulic chamber and a second hydraulic chamber; a transmission mechanism, wherein a transmission efficiency for converting and transmitting a linear motion of the input cylinder to a rotary motion of a steering wheel is less than a transmission efficiency for converting and transmitting the rotary motion of the steering wheel to the linear motion of the input cylinder; an output cylinder connected to a steerable vehicle wheel and having a third hydraulic chamber and a fourth hydraulic chamber; a first hydraulic passage for connecting the first hydraulic chamber to the third hydraulic chamber; a second hydraulic passage for connecting the second hydraulic chamber to the fourth hydraulic chamber; a flow rate control mechanism for exchanging hydraulic oil with: a first hydraulic circuit including the first and third hydraulic chambers and the first hydraulic passage; and a second hydraulic circuit including the second and fourth hydraulic chambers and the second hydraulic passage, in order to adjust a ratio of hydraulic oil quantities in the first and second hydraulic circuits; a steering actuator for providing the steerable vehicle wheel with a steering power assistance; anda controller for cooperatively controlling the flow rate control mechanism and the steering actuator.

REFERENCES:
patent: 6336519 (2002-01-01), Bohner et al.
patent: 6502661 (2003-01-01), Heitzer
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patent: 2005-82007 (2005-03-01), None
patent: WO 96/01759 (1996-01-01), None
European Search Report dated Dec. 17, 2009 (Five (5) pages).
Japanese Office Action with English Translation dated Jul. 14, 2011 (six (6) pages).

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