| 摘要 |
PURPOSE:To dispense with the processing operation at the gear slip-off time by disconnecting a counter shaft selecting clutch on the gear slip-off side upon detecting gear slip-off by a gear slip-off detecting means provided at an actuator, while connecting the other counter shaft selecting clutch to continue the travel, and shifting also an off-side gear. CONSTITUTION:When gear slip-off is generated to a speed change gear for the first gear speed in the first gear speed travel state, for instance, a protrusion 149 is separated from a first gear speed limit switch 160 so as to turn the limit switch 160 off, and current application to a counter shaft selecting clutch solenoid change-over valve 54 is cut off through a control circuit so as to cut a counter shaft selecting clutch 12 off. Simultaneously, a second counter shaft selecting clutch solenoid change-over valve 51 is duty-controlled so as to place a second counter shaft selecting clutch 20 in the 'on' state through a semi-clutch to obtain the normal second gear speed travel state. On the other hand, a gear selecting pressure oil supply change-over valve 49 is opened in association with the off operation of the counter shaft selecting clutch 12, so that pressure oil is supplied to an actuator, a shift rod is returned into the neutral position, and gear shift is performed according to a shift map. |
