Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2005-04-19
2005-04-19
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S442000, C180S421000
Reexamination Certificate
active
06880668
ABSTRACT:
A first fluid passage extends from a first outlet/inlet port of a hydraulic pump to a first work chamber of a power cylinder, and a second fluid passage extends from a second outlet/inlet port of the pump to a second work chamber of the power cylinder. A switch system switches the role of the first and second outlet/inlet ports in accordance with a turning direction of a steering wheel. Flow control mechanisms are respectively incorporated with the first and second fluid passages, so that a controlled flow of hydraulic fluid from the hydraulic pump to the first or second work chamber and vice versa are appropriately carried out thereby providing the driver with a comfortable steering feeling. A bypass arrangement may be provided between the first and second fluid passages to deal with a residual pressure that would be remained in the first or second work chamber when the hydraulic pump is under inoperative condition.
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Kurata Masakazu
Nakazawa Chiharu
Sakaki Toshimitsu
Yokota Tadaharu
Foley & Lardner LLP
Hitachi , Ltd.
Morris Lesley D.
Yeagley Daniel
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