| 摘要 |
PROBLEM TO BE SOLVED: To ensure a large space below a machine body frame by widening the right and left width between swing arms provided on right and left traveling devices. SOLUTION: In the traveling devices, a pair of front and rear swing arms 35, 45 are pivoted on the machine body frame 2 through bearing members, one end of respective swing arms is pivoted on the front and rear of a track frame 21, and the track frame is liftably constituted to the machine body frame by the turning of the swing arms. The swing arm 45 is composed of an upper arm 46, a lower arm 47, and a pivot shaft 48 connecting the upper arm with the lower arm, and supported by the bearing member between the outside end part or the inside end part of the pivot shaft, and the upper arm and the lower arm. COPYRIGHT: (C)2007,JPO&INPIT
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