| 摘要 |
PURPOSE:To make it possible to enlarge possible steering angle even when a front wheel is made to be in large diameter by providing an oscillation angle regulating mechanism which operates automatically so that the larger the steering angle of front wheel becomes, the smaller the maximum oscillation angle of a font wheel supporting member to a tractor body becomes. CONSTITUTION:A power transmission case 7, attached a pair of right and left wheels, for front wheels is attached to a tractor body via pivot pin 8 freely oacillatory around a axial center X in lengthwise direction of the body. In this case, a pair of oacillation angle regulating members 17 having inclined faces 17A descending inward respectively are attached freely slidably on both sides, right and left, of the axial center X on the power transmission case 7. And respective regulating members 17 are energized to outer direction respectively by energizing mechanisms A, while cam plates 19, which make the members slide inward against these energizing forces, are attached to movable side cases 10b of wheel side transmission cases 10. According to this structure, the larger the steering angle of the front wheels 1 becomes, the small the maximum angle of the power transmission case 7 becomes through pressing one side regulating member 17 against the energizing mechanism A with the other side cam plate 19.
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