Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1977-03-07
1978-05-09
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60468, 60488, F15B 914, F15B 1116
Patent
active
040879690
ABSTRACT:
A hydraulic speed change gear designed to automatically control its hydraulic circuit pressure to be held at all times at a substantially constant level irrespective of the loading condition so as to enable the pressure oil in the hydraulic circuit to be used as a pressure source for other various hydraulic equipment. To this end, the gear includes a fixed displacement hydraulic pump adapted to be driven by an input shaft, a variable displacement hydraulic motor having an output shaft, a closed hydraulic circuit connecting between said pump and said motor, a hydraulic supply pump drivably coupled to said input shaft, a supply passage connected with a discharge port of said supply pump and with said closed hydraulic circuit through check valves, and an oil pressure control device connected with said closed hydraulic circuit and said supply passage for reducing the oil pressure in said supply passage in proportion to a pressure rise in said closed hydraulic circuit.
REFERENCES:
patent: 2425496 (1947-08-01), Tyler
patent: 2961829 (1960-11-01), Weisenbach
patent: 3153900 (1964-10-01), Pigeroulet
patent: 3359727 (1967-12-01), Hann et al.
patent: 3734225 (1973-05-01), Kobald et al.
Nishikawa Masao
Takahashi Noriyuki
Geoghegan Edgar W.
Honda Giken Kogyo Kabushiki Kaisha
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