| 摘要 |
A working machine comprises a chassis, a first track assembly including a track inserted into the periphery of a first track support to move, and a second track assembly including a second track inserted into the periphery of a second track support to move. The first track assembly is inserted into the chassis by at least a first beam, and the first beam changes a distance between the first track assembly and the chassis by moving from the chassis. The second track support limits a second inner surface, and the working machine holds retracted and expanded positions that the first track assembly is more far away from the second track assembly when the working machine is at the expanded position. When the working machine is at the retracted position, a first part of the first beam is placed at the external surface of a second internal surface. |
