| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a reaping portion lifting and lowering controller from digging into ground by means of chassis horizontal control output during reaping work. <P>SOLUTION: In a combine harvester, a lifting and lowering mechanism for independently lifting and lowering each of right and left traveling devices (10) is arranged in each of a pair of the right and left traveling devices (10) supporting a chassis (11); a front reaping device (13) is arranged in the front portion of the chassis (11) so as to be freely lifted and lowered by means of a reaping portion lifting and lowering cylinder (19); a ground height sensor (25) for detecting the ground height of the front reaping device (13) at a plurality of points in a reaping width direction is arranged; and the lifting and lowering mechanisms of the traveling devices (10) are controlled on the basis of the ground heights detected by the ground height sensor (25) in such a manner as to keep the front reaping device (13) to a predetermined ground height. The combine harvester has a constitution that a horizontal control command to the lifting and lowering mechanisms of the travelling devices (10) is stopped when a ground height detected by the ground height sensor (25) is equal to or lower than a predetermined lower limit height. <P>COPYRIGHT: (C)2012,JPO&INPIT |
