| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily keep the friction force between a drive wheel and a crawler and prevent the slip between the drive wheel and the crawler to smoothly transmit the power of the drive wheel to the crawler. SOLUTION: In this structure, a drive wheel and a driven wheel are rotatably arranged on a truck frame, a crawler is suspended between the drive wheel and the driven wheel to form a traveling part, the drive wheel is provided with a lateral pair of drive wheel structures, and the inside surface of the crawler and the side surface of a projection formed on the inside surface are allowed to abut on the inside surfaces of both the driven wheel structures, whereby the crawler is rotated. The drive wheel comprises a moving means for moving one drive wheel structure toward the other drive wheel structure.
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