Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Reexamination Certificate
2006-06-13
2006-06-13
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
C060S445000
Reexamination Certificate
active
07059125
ABSTRACT:
In a hydraulic controller for construction machine according to the present invention, wherein there are provided regulators for each of a first and a second capacity variable hydraulic pump, each of the regulators being controlled, detecting the discharge pressure of each pump, in such a manner that one of the pumps absorbs a part of torque while the other thereof absorbs the remaining torque, and wherein a boom raising operation causes pressure oil from the pumps to be joined together and then supplied to a boom cylinder, while also a rotating operation causes pressure oil from the second pump to be supplied to a rotating motor, is provided a flow rate distribution controller adapted to control the regulators in such a manner that a difference in flow rate is provided between the pumps so that the first pump shows a higher flow rate at the start of a combined operation of raising and rotating, and that, on a steady rotating state which results in an increase in the discharge pressure difference between the pumps, the difference in flow rate is reduced. This enables pump horsepower to be distributed optimally between the boom cylinder and rotating motor during the raising and rotating operation.
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Oka Hidekazu
Senoo Saburo
Yamashita Koji
Kobelco Construction Machinery Co., Ltd.
Leslie Michael
Look Edward K.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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