| 摘要 |
<p>A continuously variable transmission, a drive device, and a method of controlling the drive device. The continuously variable transmission comprises a belt type continuously variable transmission (A) and a forward/backward movement changeover device (4) having a planetary gear mechanism (40), a reversing brake (50), and a direct-coupled clutch (60) to perform forward/backward movement changeover operation by selectively coupling the reversing brake to the direct-coupled clutch. The operating piston (62) of the direct-coupled clutch is disposed in a stationary cylinder (8) fixed to a transmission case, and the axial pressure of the operating piston is transmitted to the transmission case (5a) through a bearing (16) rotatably supporting the drive side pulley shaft (10) of the continuously variable transmission. Also, the transmission comprises a hydraulic pressure regulating means (SLU72) controlling a supply pressure to the direct-coupled clutch (60) to such a least hydraulic pressure that does not cause slippage on the direct-coupled clutch according to a variation in input torque.</p> |
