| 摘要 |
A track frame (2) is rockably supported on a rear axle case of a travel machine body through a rocking shaft (8). Front and rear idler wheels (3, 4) are disposed at the front and rear ends of the track frame (2). At least three wheels (5) spaced from each other in the longitudinal direction are installed at the intermediate part of the track frame. A drive wheel (6), to which power is transmitted from a rear axle (33) supported on the rear axle case, is disposed above the longitudinal intermediate part of the track frame (2). A crawler track (7) is wrapped around the drive wheel (6), the front and rear idler wheels (3, 4), and the wheels(5). Of the wheels (5), two wheels (5) on the read side are pivotally supported on a rocking link (20). The longitudinal intermediate part of the locking link (20) is pivotally supported on the track frame (2) through a pivot shaft (22). ® KIPO & WIPO 2009
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