Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1985-02-05
1986-07-08
Freeh, William L.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
417218, 417222, F04B 4900
Patent
active
045990506
ABSTRACT:
Disclosed herein is a device for controlling displacement of a variable displacement hydraulic pump comprising a displacement control system for receiving a discharge pressure of the variable displacement hydraulic pump and a discharge pressure of a fixed displacement hydraulic pump to control the displacement of the variable displacement hydraulic pump. The displacement control system comprises a servopiston including a helical compression spring for maintaining the variable displacement hydraulic pump at a maximum swash angle in a neutral position of associated operating valve, a servovalve including a spool for selectively controlling communication of hydraulic pressure between a control pump and a pair of fluid chambers defined in the servopiston, a control piston connected through a control lever pivotably supported by a pivot pin to the spool and the servopiston, at least two helical compression springs for biasing the control piston and controlling torque and flow so as to approximate same to a constant torque curve, a floating spring seat interposed between the helical compression springs, and a guide rod for guiding the floating spring seat and accommodated in a bore formed in the housing at a base portion thereof to define a pressure chamber pressurized by a biasing spring, the pressure chamber being communicated through a conduit to a discharge passage of the fixed displacement hydraulic pump.
REFERENCES:
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4248574 (1981-02-01), Uehara et al.
patent: 4498847 (1985-02-01), Akiyama
Ishizaki Naoki
Morita Koichi
Freeh William L.
Kabushiki Kaisha Komatsu Seisakusho
Neils Paul F.
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