Hydrostatic continuously variable transmission

Details Hydrostatic continuously variable transmission Hydrostatic continuously variable transmission

1992-12-09

1994-10-18

Bui, Thuy M.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

474 18, F16H 5900

Patent

active

053563476

ABSTRACT:
A hydrostatic continuously variable transmission includes a closed hydraulic circuit comprising a hydraulic pump, a hydraulic motor, and an oil supply passage connected between the hydraulic pump and the hydraulic motor. The hydraulic pump selectively generates a first oil pressure lower than a first predetermined pressure level, a second slowly-changing oil pressure higher than the first predetermined pressure level when the transmission is in normal operation, and a third rapidly-changing oil pressure higher than a second predetermined pressure level higher than the first predetermined pressure level when the transmission starts to operate. The transmission also includes a first pressure-responsive valve for connecting the oil supply passage to the oil tank in response to the first oil pressure applied through the oil supply passage, and disconnecting the oil supply passage from the oil tank in response to the second oil pressure applied through the oil supply passage, and a second pressure-responsive valve for connecting the oil supply passage to the oil tank in response to the third oil pressure applied through the oil supply passage, and disconnecting the oil supply passage from the oil tank in response to the second oil pressure applied through the oil supply passage.

REFERENCES:
patent: 4704097 (1987-11-01), Sakai
patent: 4765228 (1988-08-01), Wagenseil
patent: 4942786 (1990-07-01), Dittrich
patent: 4973288 (1990-11-01), Sakakibara et al.
patent: 5125291 (1992-06-01), Makita et al.

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