| 摘要 |
PROBLEM TO BE SOLVED: To vary a crawler width by arranging two cylinders before and after a swivel joint and interposing each cylinder between a center frame and left and right track frames. SOLUTION: At a center part of a frame 64A of a center frame 64, a base part of a swivel joint 65 is mounted. The swivel joint 65 is inserted and fitted into a revolving supporting hole punched at a bottom surface center of a revolving body mounted on an upper part of a crawler traveling device, supports the revolving body so as to be rotatable to left and right sides and feeds pressure oil. At a position close to the front and rear of the swivel joint 65, two cylinders 66R, 66L are disposed. The crawler traveling device is constituted so as to vary left and right widths (track frames 66L, 66R space) of the crawler traveling device by elongation and contract of the cylinders 66L, 66R.
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