Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1988-08-23
1991-08-27
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60452, 60489, 60490, F16D 3102
Patent
active
050422510
ABSTRACT:
A hydrostatic driving gear is described comprising a primary unit rotationally driven by a driving engine and a secondary unit rotationally driving an actuator. Each unit comprises a variable displacement hydraulic engine, in particular an axial piston engine. They cooperate in an open circuit. The primary unit and secondary unit each have a displacement adjusting device and can be continuously adjusted in respect of their direction of displacement through a zero displacement center position in two directions of displacement. The displacement adjusting device of the primary unit has associated with it a pressure flow controller which holds the working pressure at a constant presettable value. The displacement adjusting device of the secondary unit has associated with it a speed of rotation detecting device, having a position sensor to detect the flow setting. The secondary unit also has associated with it a speed detecting device and an electronic controller is provided which detects the displacement setting of the secondary unit and its actual speed of rotation and compares it with a predetermined desired actual speed of rotation and adjusts the controller correspondingly. A secondary controlled hydrostatic driving gear in an open circuit is provided which makes four-quadrant operation possible.
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BrueninghausHydraulik GmbH
Look Edward K.
Ryznic John E.
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