| 摘要 |
<p>A forward backward changeover device for continuously variable transmission comprises a planetary gear set (40), a revere brake (50) and a direct-coupling clutch (51). The reverse brake (50) is arranged between a carrier (44) and a transmission casing (5), while the direct-coupling clutch (51) is arranged between the carrier (44) and the sun gear (41). The sun gear (41) is coupled to an input shaft (3), whereas a ring gear (42) is coupled to a driver pulley (11). Hydraulic actuator (51b, 51c) for engaging the direct-coupling clutch (51) is mounted on an oil pump cover (8) fixed to the transmission casing (5), and a thrust bearing (52) is arranged between the hydraulic actuator (51c) and a clutch disc (51a). By means of the hydraulic actuator mounted on a stationary member (8), a forward backward changeover device having a reduced frictional loss as well as a simple and compact construction is obtained.</p> |
