PROBLEM TO BE SOLVED: To optimize a seal mechanism, while avoiding a stored oil in a specified case portion from being supplied to equipment in another case, and avoiding early deterioration of the equipment due to wear, and the complication of a case shape and the complication of a maintenance work.SOLUTION: An oil supply pump 36 which supplies the stored oil to each equipment which is the object of supply of the stored oil stored in an input case 30, and a filter 37 for filtering the stored oil circulating in the input case 30 are provided in the input case 30. An oil supply pump 45 which supplies, to one of hydrostatic continuously variable transmissions 41 which are provided respectively in the right or left axle case 40, the stored oil in an axle case 40 of the side in which the hydrostatic continuously variable transmission 41 is present being provided, and a filter 46 which filters the stored oil circulating in each axle case 40 are provided for right or left axle case 40.COPYRIGHT: (C)2013,JPO&INPIT【課題】特定のケース部分の貯留油が、別のケース内の機器へ供給されることを避け、摩耗による機器の早期の劣化、及びケース形状の複雑化やメンテナンス作業の煩雑化を避けながら、シール構造の適正化を図る。【解決手段】入力ケース30に貯留された貯留油の供給対象となる各機器に対して貯留油を供給する給油ポンプ36と、入力ケース30内を循環する貯留油を濾過するためのフィルタ37とを、入力ケース30に設け、左又は右の車軸ケース40のそれぞれに設けてある油圧式無段変速装置41に対して、その油圧式無段変速装置41が存在する側の車軸ケース40内の貯留油を供給する給油ポンプ45と、各車軸ケース40内で循環する貯留油を濾過するフィルタ46とを、左又は右の車軸ケース40ごとに設けてある。【選択図】図7
