| 摘要 |
PROBLEM TO BE SOLVED: To improve durability of a starting wheel on a tracked vehicle.SOLUTION: The starting wheel 21 has a structure that on an outer peripheral surface of a cylindrical body 22 having a rotation axis parallel to a vehicle running direction, a projection (spiral shape projection 23) which is spiral shape and which engages with a groove between track plates 26 and which feeds a screw to a crawler 24 is formed. The crawler 24 has a shape that the groove 27 between the track plates 26 engages with the spiral shape projection 23. The driving gear having improved durability has the crawler 24 and the starting wheel 21 to improve durability of a starting wheel on a tracked vehicle. |
