Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2005-03-31
2008-10-14
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S419000, C180S420000, C180S421000, C180S422000, C180S423000, C137S625640, C137S625230, C137S625430
Reexamination Certificate
active
07434653
ABSTRACT:
A hydraulic steering system for a work machine may include a first steering actuator having a first and a second chamber. In addition, the steering system may include a second steering actuator having a third and a fourth chamber. A multi-position directional valve may include at least one low power position and at least one high power position. The low power position may be configured to direct fluid only to the first chamber during a low power turn to extend the first steering actuator. The high power position may be configured to direct fluid to the first chamber and the third chamber during a high power turn to retract the second steering actuator.
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Huang Xiaodong
Khalil Rabie E.
Krone John James
Mientus Michael J.
Caterpillar Inc.
Finnegan Henderson Farabow Garrett & Dunner
Morris Lesley D.
Stabley Michael R
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