Pump swashplate control assist

Details Pump swashplate control assist Pump swashplate control assist

1982-11-22

1984-11-06

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

60444, 60447, 60452, 417217, 417218, 417222, F04B 4900

Patent

active

044809638

ABSTRACT:
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.

REFERENCES:
patent: 3708978 (1973-01-01), Reiff et al.
patent: 3935707 (1976-02-01), Murphy et al.
patent: 4017218 (1977-04-01), Burk et al.

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