| 摘要 |
A hydraulic power transfer system, for use for example in the propulsion of a vehicle, comprising an engine, a fixed positive displacement pump driven by the engine, a fixed positive displacement pump driven by the engine, a variable positive displacement motor, a control valve controlling flow of liquid from the pump to the motor and a pressure responsive means responding to increase in hydraulic pressure at the motor to increase motor displacement and increase engine speed. The variable positive displacement motor may be the propulsion motor for the vehicle. The control valve may include a variable flow-selecting device adapted to feed the motor some of the pressure liquid delivered by the pump and including a bypass to carry the remainder of the liquid carried by the pump back to reservoir. The pressure-responsive means may operate to limit hydraulic pressure to a value which having regard to the volumetric displacement of the pump will demand a driving torque from the engine less than the maximum torque of which the engine is capable.
|
