| 摘要 |
PROBLEM TO BE SOLVED: To provide a crawler unit with a surface of a truck frame at low cost, hardly causing damage to a rubber crawler belt. SOLUTION: The truck frame 10 comprises a main truck frame 11 formed of a square steel pipe material and a sub truck frame 12 formed of a bending sheet metal material having groove-shaped cross section of which opening side faces and connects to the lower surface side of the main truck frame 11. Round bar materials 25 and 26 are disposed on the side surface side opposite to a side having a crawler guide wheel bodies 3 on the front end side and back end side of the truck frame 10. The front side round bar material 25 is disposed facing the front end side corner of the main truck frame 11 and the front end side corner 12f of the sub truck frame 12 over both truck frames 11 and 12. The back side round bar material 26 is disposed facing the back end side corner of the main truck frame 11 and the back end side corner 12r of the sub truck frame 12 over both truck frames 11 and 12. COPYRIGHT: (C)2004,JPO&NCIPI
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