Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1987-07-20
1988-07-05
Look, Edward K.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60413, 60459, 60460, 60468, 60488, 60489, 60493, F16D 3102
Patent
active
047546034
ABSTRACT:
A prime-mover driven variable-rate pump of relatively great flow capacity is in delivery and return-circuit connection to an intermittently loaded hydraulic motor. A fixed-rate pump of substantially less capacity is continuously driven by the prime-mover, to charge a hydraulic accumulator, there being a safety relief to sump when a predetermined high-pressure threshold is reached. The accumulator is exclusively connected to the inlet of the variable-rate pump, being isolated by check valves from delivering any reverse flow to the fixed-rate pump and from delivering any reverse flow to the return portion of the motor-driving circuit. In said return portion, and between its check valve and the motor, a "dump" valve is operable for transient diversion of return flow to sump, thereby transiently enabling enhanced load-accelerating torque from the motor; this valve is preferably pressure-operated to "dump" position upon a load-reflecting pressure rise in the supply line from the variable-rate pump to the motor. Normal motor-running speeds are selectively determined by the variable-rate pump; and load-reflected angular momentum causes the motor to pump return fluid at elevated pressure, in partial recharge of the accumulator, thus assisting in braking the angular momentum while aiding in a recharge of the accumulator.
REFERENCES:
patent: 3680313 (1972-08-01), Brundage
patent: 3913453 (1975-10-01), Parquet
patent: 4077211 (1978-03-01), Fricke
patent: 4098083 (1978-07-01), Carman
patent: 4215545 (1980-08-01), Morello et al.
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