| 摘要 |
<p>PURPOSE:To eliminate the revolution variation of an output shaft when clutches are switched, by supplying each clutch operating hydraulic pressure for a certain short time at a same time into the both clutches for the initial speed stage and the selected speed stage. CONSTITUTION:When the switching from the high-speed clutch to the low-speed clutch is performed, a selecting solenoid valve 29 in a clutch operating hydraulic- pressure feeding line 27 of a high-speed clutch 14 is opened, and each hydraulic pressure is supplied into the low-speed and high-speed clutches at a same time. The control hydraulic pressure for each centrifugal control valve 31 of the both clutches is fixed by adjusting each stroke of the rods of the revolution- speed control valves 35 and 34 by a lever so that each constant revolution speed of the output shafts of the both clutches is maintained. Thus, after the both clutches are operated for a short time, a selecting solenoid valve 30 is closed to cut-off the hydraulic pressure to the low-speed clutch, and thus power can be switched smoothly free from the selecting shock.</p> |
