| 摘要 |
PROBLEM TO BE SOLVED: To efficiently perform a tension adjustment and impact absorption of a substantially triangular crawler by a movement of an adjusting wheel. SOLUTION: The adjusting wheel 3 for adjusting tension, an idler driven wheel 4 and an intermediate idler wheel 5 between these are arranged and supported in the longitudinal direction in a truck frame 2. A driving wheel 6 is arranged above the idler wheel 5. A crawler 7 is wound on these whole wheels. The adjusting wheel 3 is supported by a support 8. The support 8 is rockingly supported by the truck frame 2 to move the adjusting wheel 3 in the substantially distant-near direction to the driving wheel 6. A tension adjusting mechanism 9 for energizing the adjusting wheel 3 in the distant direction is arranged between the support 8 and the truck frame 2.
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