| 摘要 |
PROBLEM TO BE SOLVED: To provide a working vehicle capable of smoothly travelling even in case of an advancing high load while keeping a size of an overall frame body compact. SOLUTION: Wheel supporting bodies 55 of rear wheels 3 are fastened and provided on both ends of a frame 56, an axis 23 vertically moves integrally with a rear wheel transmission case 22 when the rear wheel transmission case 22 revolves by driving reaction (arrow A) of the rear wheel 3 around a revolving fulcrum shaft 22a of the rear wheel transmission case 22 in case of the advancing high load, a tensile spring 57 provided between the wheel supporting body 55 and the rear wheel transmission case 22 energizes movement and automatically raises the rear part side of a car body 1 by comparatively small force as revolution of the rear wheel transmission case 22 is energized to the opposite side of the axis 23 against the revolving fulcrum shaft 22a, the front and rear wheels 2, 3 can certainly grasp a road surface by restraining floating of a front part of the car body 1, and a travelling property of a rice-planting machinery at the time of advancing high load is improved. Especially, a mud pushing preventive effect in case of a wet rice field is high. COPYRIGHT: (C)2007,JPO&INPIT
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