| 摘要 |
PROBLEM TO BE SOLVED: To smoothly carry out a shift from straight travel to turning travel and the opposite without causing any great shock. SOLUTION: Traveling power is transmitted to crawler traveling devices 8 on the left and right sides via a differential device 6, and a differential switching device 16 switching the differential device 6 between a non differential condition, in which differential between left and right crawler traveling devices 8 is prevented for traveling a machine body straight, and a differential condition, in which differential between the left and right crawler traveling devices 8 is allowed for turning the machine body, is arranged, while steering frictional brakes 15 are arranged between the differential device 6 and the left and right crawler traveling devices 8.
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