Pump swashplate control assist

Details Pump swashplate control assist Pump swashplate control assist

F - Mech Eng,Light,Heat,Weapons

04

B

138/45.1

F04B 1/26 (2006.01) F04B 49/00 (2006.01) F16H 61/42 (2006.01)

Patent

CA 1196251

PUMP SWASHPLATE CONTROL ASSIST Abstract of the Disclosure A hydrostatic drive system includes a hydraulic motor driven by a variable displacement axial piston pump with alternative intake and output ports. A charge pump generates a charge pressure which is communicated only to the pump intake port via a charge valve unit. The pump displacement is controlled by a swashplate which is moved by servo pistons which receive fluid from a displacement control valve. A three check valve unit communicates the higher of pump intake, outlet and charge fluid pressures to an inlet of the displacement control valve.

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