PROBLEM TO BE SOLVED: To provide a motor section structure of a working vehicle, excellent in engine cooling efficiency and enabling its maintenance/inspection to be conducted easily.SOLUTION: The motor section structure of a working vehicle has a following construction: a hydraulic stepless variable-speed gear (30) outputting to a fan (40) side the driving force of an engine (20) by shifting gears to change speed is arranged at an inner side point of an engine room (8) and by variable-speed actuation in the normal and reverse directions of the hydraulic stepless variable-speed gear (30), a cooling mode where the fan (40) is normally-driven to suck the outside air from the outside of a filter (12) into the inside thereof and a dust-removing mode, where the fan (40) is reverse-driven to blow wind from the inside of the filter (12) to the outside thereof, are made to be switchable therebetween.COPYRIGHT: (C)2014,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)の駆動力を変速してファン(40)側に出力する油圧式無段変速機(30)を、エンジンルーム(8)における内側の部位に配置し、油圧式無段変速機(30)の正転方向および逆転方向への変速作動によって、ファン(40)を正転駆動して濾過体(12)の外側から内側へ外気を吸入する冷却状態と、ファン(40)を逆転駆動して濾過体(12)の内側から外側へ風を吹き出す除塵状態とに切換自在な構成としたことにより解決される。【選択図】図4
