Hydraulic circuit for controlling actuators in a construction ve

Details Hydraulic circuit for controlling actuators in a construction ve Hydraulic circuit for controlling actuators in a construction ve

1975-12-05

1977-05-10

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60449, 60468, 60484, F16H 3946

Patent

active

040220230

ABSTRACT:
A hydraulic circuit for controlling actuators in a construction vehicle which comprises an engine, a fixed displacement pump driven by said engine, a variable displacement pump driven by said engine, a controlling cylinder connected to the variable displacement pump for controlling the displacement thereof, an orifice provided between the output of the fixed displacement pump and a tank and, an unloading valve connected to the fixed displacement pump and also to the variable displacement pump via a pilot line for selectively unloading an output fluid from the fixed displacement pump when it is open.

REFERENCES:
patent: 3543508 (1970-12-01), Schwab
patent: 3785754 (1974-01-01), Miller

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