PROBLEM TO BE SOLVED: To manufacture a composite shift mechanism with a small number of components at a low cost, outputting variable speed rotation force from an engine to respective drive parts with high transmission efficiency and allowing easy compact installation into a machine body.SOLUTION: This work vehicle is provided with the composite shift mechanism 115 generating composite output of a planetary gear mechanism 85 and a hydraulic shaft mechanism 57 transmitting the drive force of the engine 2, and an input shaft 58 of the composite transmission mechanism 57 is provided with a driving gear 74 of the planetary gear mechanism 83.COPYRIGHT: (C)2003,JPO【課題】 エンジンからの変速回転力を各駆動部に高い伝達効率で出力させる複合変速機構を部品点数の少い低コストに形成して、機体にコンパクトな組込みを容易に可能とさせる。【解決手段】 エンジン2の駆動力を伝達する油圧変速機構57と遊星ギヤ機構83との合成出力を形成する複合変速機構115を設けると共に、油圧変速機構57の入力軸58に遊星ギヤ機構83の駆動用ギヤ74を設ける。
