Power plants – Pressure fluid source and motor – Input pump and rotary output motor system having...
Patent
1989-08-15
1991-12-17
Look, Edward K.
Power plants
Pressure fluid source and motor
Input pump and rotary output motor system having...
60487, F16D 3900
Patent
active
050725874
ABSTRACT:
A hydraulically operated continuously variable transmission includes a hydraulic pump coupled to an input shaft, a hydraulic motor coupled to an output shaft, a closed hydraulic circuit interconnecting the hydraulic pump and the hydraulic motor, a hydraulic actuator for actuating a controlled member in the closed hydraulic circuit, an auxiliary pump connectable to the closed hydraulic circuit and the hydraulic actuator, a supply oil passage for supplying oil discharged from the auxiliary pump to the hydraulic actuator, and a control valve coupled between the supply oil passage, the closed hydraulic circuit, and an oil tank. The control valve comprises a hydraulic chamber communicating with the supply oil passage, a spring, and a spool disposed between the hydraulic chamber and the spring. The spool is movable, until the pressure of oil in the hydraulic chamber and the force of the spring are balanced, successively from a first position in which the supply oil passage and the closed hydraulic circuit are disconnected and the supply oil passage and the oil tank are disconnected, to a second position in which the supply oil passage and the closed hydraulic circuit are connected, to a third position in which the supply oil passage and the oil tank are connected, in response to an increase in the pressure of oil in the hydraulic chamber.
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Furumoto Mitsumasa
Ikejiri Kenichi
Kawahara Eiichiro
Honda Giken Kogyo Kabushiki Kaisha
Look Edward K.
Ryznic John
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