| 摘要 |
<p>A control system for an infinitely variable belt-drive transmission for an engine has a drive pulley (24) having a hydraulically shiftable disc (24a), a driven pulley (28) having a hydraulically shiftable disc (28a), a belt (26) engaged with both pulleys, and a hydraulic control circuit having a pump (36, 37) for supplying oil to shift the discs (24a, 28a). A transmission ratio control valve (44) is provided in the control circuit and responsive to engine speed for controlling the flow of oil to the disc 24a of the drive pulley for shifting the disc of the drive pulley to change to transmission ratio. A pressure regulator valve (43) is provided to respond to the transmission ratio for controlling the line pressure in the hydraulic circuit. An accumulator (60) is provided to supply the oil to the hydraulic cylinder (28b) of the driven pulley (28) when the pressure in that cylinder decreased undesirably.</p> |
