| 摘要 |
PROBLEM TO BE SOLVED: To permit a full increase in the rigidity of the whole of a side frame by a reinforcing plate against a load from a crawler acting to the upper roller. SOLUTION: Inside a side frame 3, a first reinforcing plate 21 is arranged in a width direction near an upper roller 16, and this reinforcing plate 21 is fixed to a side plate portion 3B at the inner side of an upper plate portion 3A of a side frame 3 and to a side plate portion 3C at the outer side. Also, inside this side frame 3, a reinforcing plate 23 is arranged diagonally at the corner portions at the nearby position of the upper roller 16 and the side plate portion 3B at the inner side. And this reinforcing plate 23 is fixed respectively to the upper plate portion 3A, the side plate portion 3B and the reinforcing plate 21.
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