| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To avoid the degradation of operability while preventing an increase in the size of a shift drum in spite of an increase of shift positions set on the shift drum. <P>SOLUTION: A common shift position for establishing both of a forward travel maximum speed gear train and a reverse travel gear train is set on the shift drum 95 so that a reverse travel stopper arm 143 is fitted to one end 141a of a reverse travel cam groove 144 in the common shift position. When the shift drum 95 is rotated in a second rotating direction 149 opposite a first rotating direction 148 in the state of establishing the reverse travel gear train, the reverse travel stopper arm 143 in an outer force non-operating condition is removed from one end 141a of the reverse travel cam groove 141 to ride over the outer periphery of the shift drum 95 and moved to the side of the other end 141b of the reverse travel cam groove 141. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
