| 摘要 |
PROBLEM TO BE SOLVED: To easily change the peripheral speed of a front wheel by a reduction gear so as to almost coincide with the peripheral speed of a rear wheel without making a design change of a front axle case when changing the peripheral speed of the rear wheel. SOLUTION: A front axle frame is connected to the front part of an engine, and the front axle frame is provided with a support body 4. A center pin part 7 of the front axle case 6 with a front wheel differential gear 5 built therein is pivotally supported by the support body 4. The reduction gear 9 for inputting of power of a front wheel travel transmission system transmitted from the engine 2 after reducing the speed is connected to a bevel pinion shaft 8 of the front wheel differential gear 5. A case 10 of the reduction gear 9 is longitudinally divided, and a front case 10F is integrated with the support body 4, while a rear case 10R is detachably mounted to the front case 10F.
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