PROBLEM TO BE SOLVED: To maintain excellently an operational environment in a cockpit by reducing transmission to the cockpit, of vibration generated upon driving of a hydraulic stepless speed variator for a fan.SOLUTION: A hydraulic stepless speed variator (30) for driving a fan (40) for cooling an engine (E) is provided on the furthermore outside than the outer periphery of the fan (40), and the hydraulic stepless speed variator (30) is supported by an upper part of a first support frame (37) whose lower part is fastened onto a transmission (74) or a hydraulic stepless speed variator (70) for traveling, and an upper part of a second support frame (38) whose lower part is fastened onto a suspension stand (56A).SELECTED DRAWING: Figure 6COPYRIGHT: (C)2017,JPO&INPIT【課題】ファン用油圧式無段変速装置の駆動時に発生する振動が操縦席に伝わりにくいものとし、操縦席における操作環境を良好に維持する。【解決手段】エンジン(E)冷却用のファン(40)を駆動する油圧式無段変速装置(30)を、ファン(40)の外周部よりも外側に設け、トランスミッション(74)または走行用油圧式無段変速装置(70)に下部を固着した第1支持フレーム(37)の上部と、懸架台(56A)に下部を固着した第2支持フレーム(38)の上部とによって油圧式無段変速装置(30)を支持する。【選択図】図6
