Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1983-06-27
1985-02-12
Freeh, William L.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
417218, 417222, 60430, 60447, 60452, 60486, F04B 4900
Patent
active
044988478
ABSTRACT:
A control system for variable displacement hydraulic pumps for use in a hydraulically operated construction vehicle having a fixed displacement hydraulic pump, a plurality of reducing valves operatively interlocked with work implement control valve units of the vehicle disposed on the delivery sides of the variable displacement pumps, control sections for controlling respective flow rate of the variable displacement pumps and equipment for exerting delivery pressures of both the fixed and variable displacement pumps and output pressure of the reducing valve on the control units. The control system exhibits three control functions, i.e., flow control for varying the angle of the swash plate of the variable displacement pump in proportion to the manipulating position of the respective work implement controlling valve, constant torque control in proportion to the delivery pressures of the variable displacement pumps, and cut-off control for reducing relief losses.
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patent: 4065228 (1977-12-01), McMillan
patent: 4248573 (1981-02-01), Uehara et al.
patent: 4248574 (1981-02-01), Uehara et al.
Freeh William L.
Kabushiki Kaisha Komatsu Seisakusho
Neils Paul F.
LandOfFree
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