To provide a structure in which a transmission case is well cooled by a cooling fan.
An endless belt 44 is wrapped around an output pulley attached to the output shaft of an engine and an input pulley 43 attached to the input shaft 42 of the transmission case 41, and the cooling fan 47 is attached to the outer end of the input pulley 43. A conical part 41T which comprises an apex at the axis X of the input shaft 42 is formed on the transmission case 41. The input pulley 43 includes a conical pulley body part 43A formed along the conical part 41T and a belt-wound part 43B formed on the outer periphery of the pulley body part. Since a space S in which the distance between the input pulley 43 and the cooling fan 47 is increased toward the outer peripheral side of the input pulley 43 is formed, cooling air can flow without being obstructed by the input pulley 43.
YAMAUCHI KAZUYOSHI
Mountain Saki Tetsuya
Takashi Hamano