[ Problems ] blower fan is inhibited by the fan continuously variable transmission and a control unit , the cooling efficiency of the radiator and the engine there is a problem of a decrease . A fan continuously variable transmission 20 which drives the fan 16 of the engine 10 , and switched freely configured and dust conditions for cooling state and the reverse rotation drive for the forward rotation drive the fan 16 . The rotating gear 34 attached to the trunnion shaft 33 of the fan continuously variable transmission 20 is a fan shape which intersects the axial direction of the trunnion shaft 33 , trunnion to the site between the attachment portion 40 and the gear portion 41 by penetrating in the axial direction of the shaft 33 is a structure in which to form an opening 42 which is open . The stopper 43 of the rotating gear 34 , I will be disposed within the opening 42 . Combine provided an abutting portion 45 which abuts the stopper 43 on the periphery of the opening 42 . [ Selection Figure Figure 4【課題】ファン無段変速装置やその制御部によってファンの送風が阻害され、ラジエーターおよびエンジンの冷却効率が低下するという課題がある。【解決手段】エンジン10のファン16を駆動するファン用無段変速装置20は、該ファン16を正回転駆動させる冷却状態と逆回転駆動させる除塵状態とに切替自在な構成とする。前記ファン用無段変速装置20のトラニオン軸33に取付けた回動ギヤ34は、前記トラニオン軸33の軸心方向に交差する扇形状で、取付部40とギヤ部41との間の部位にトラニオン軸33の軸心方向に貫通して開口する開口部42を形成した構成とする。回動ギヤ34のストッパ43を、開口部42内に配設する。開口部42の周縁部にストッパ43に当接する当接部45を設けたコンバイン。【選択図】図4
