| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide easy and quick shifting while traveling, and to facilitate maintenance by omitting complicated linkage for shifting. <P>SOLUTION: A high-low two stage variable hydraulic motor 7 and a variable hydraulic pump 5 of variable speed provided in a power transmission system to a travel device 9 are composed to be shifted by actuators 4, 6 operated by electric signals. In operation of a first shift lever 2 provided near an operator seat from low speed to high speed, a maximum gear change range setting by gear change of the variable hydraulic pump 5 is changed from low speed to high speed, the actuators 4, 6 are controlled to change the variable hydraulic motor 7 from low speed to high speed, and the actuators 4, 6 are controlled to carry out continuously variable speed change of the variable hydraulic pump 5 within the set maximum gear change range by the first shift lever 2. <P>COPYRIGHT: (C)2010,JPO&INPIT |
