PROBLEM TO BE SOLVED: To provide a prime mover structure of a working vehicle which excels in cooling efficiency of an engine, and facilitates maintenance and inspection.SOLUTION: A radiator (80) is arranged on the outer side of the engine (20), a filter body (12) is arranged on the outer side of the radiator (80), and a fan (40) is arranged between the engine (20) and the radiator (80). A hydraulic continuously variable transmission (30) capable of forward and reverse rotation output is provided to shift the driving force of the engine (20) and drive the fan (40). The hydraulic continuously variable transmission (30) is arranged to be biased to the outer side of a rotation path of the fan (40) when viewed from the direction of the rotational axis of the fan (40).COPYRIGHT: (C)2012,JPO&INPIT【課題】エンジンの冷却効率に優れ、保守・点検を容易に行なうことができる作業車輌の原動部構造を提供する。【解決手段】エンジン(20)の外側の部位にラジエータ(80)を配置し、ラジエータ(80)の外側の部位に濾過体(12)を配置し、エンジン(20)とラジエータ(80)の間の部位にはファン(40)を配置し、エンジン(20)の駆動力を変速してファン(40)を駆動する正逆転出力可能な油圧式無段変速機(30)を設け、ファン(40)の回転軸芯方向から視て、油圧式無段変速機(30)をファン(40)の回転軌跡の外側に偏倚させて配置する構成としたことにより解決される。【選択図】図7
