To provide a traveling power transmission for tractor which enables a smooth turning to be performed without producing a shock in the speed variation or without damaging a vegetable field at the time of turning by changing the peripheral speed ratio continuously at a certain degree based on a turning radius by a handle operation when the machine frame is turned in a vicinity of the ridge.
A center differential 5 is provided at the power branching section for a front wheel driving system 10 and a rear wheel driving system 11 of this traveling power transmission. By the center differential 5, the driving force from an engine E is transmitted to a front wheel differential 30 and a rear wheel differential 38, and front wheels 8 and rear wheels 9 on the right and the left are driven by the front and rear differentials 30 and 38 for this tractor. In the tractor, the center differential 5 is constituted of a limited slip differential having a differential-limiting function.
IIDA MASAYA
TAKAHASHI NOBUTOSHI
KOSHI KAZUYA
