Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2011-02-22
2011-02-22
Morris, Lesley (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S420000, C180S421000, C180S418000
Reexamination Certificate
active
07891458
ABSTRACT:
A priority valve7is disposed between a hydraulic pump2and a steering valve4and is used to supply priority steering cylinders103aand103bwith pressurized oil discharged from the hydraulic pump2by controlling the differential pressure across a meter-in hydraulic line of the steering valve4such that the differential pressure is kept at a target value. A pressure sensor31for detecting the load pressures of the steering cylinders103aand103bis provided. On the basis of the detected load pressures, the target value set for the priority valve7is modified by devices including a controller32, a solenoid valve33, a pilot hydraulic line29, and a pressure receiving unit24cof the priority valve7. The above configuration enables suppression of a shock occurring at the start of turning of the steering wheel.
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Azuma Hiroyuki
Ishikawa Kouji
Itoga Kentarou
Nakamura Kazunori
Nakamura Tsuyoshi
Arce Marlon A
Hitachi Construction Machinery Co. Ltd.
Mattingly & Malur, P.C.
Morris Lesley
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