| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-weight sub frame having a cross-section factor wherein bending strength corresponding to front and rear positions of the sub frame extending in the front/rear direction is taken into consideration. SOLUTION: This working vehicle is constituted based on a track vehicle having a pair of chassis frames extending in the front and rear direction, and the hollow sub frame 20 extending in the front/rear direction is attached onto the pair of chassis frames. Stringers 30, 31, 32 extending in the front/rear direction are attached onto the inside of the sub frame 20, and the stringers 30, 31, 32 are attached onto the sub frame 20 so that the cross-section factor of the sub frame 20 may become a desired cross-section factor corresponding to the front and rear positions of the sub frame 20. That means, the number of the stringers 30, 31, 32 to be attached is increased at positions where the bending strength is large, and the number of the stringers 30, 31 to be attached is decreased at positions where the bending strength is small. COPYRIGHT: (C)2004,JPO
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