| 摘要 |
PURPOSE:To increase an effect of cooling a belt moved running, by mounting a fan to one of the shafts and providing a straightening plate along a direction of the belt between the tense and loose belts, connecting both pulleys, in a transmission case which provides the driving and driven pulleys to be arranged. CONSTITUTION:A continuously variable transmission type driving pulley 19 in a power unit 10 of a motorcycle is mounted to a crankshaft of an engine 11. And the unit 10, turning a coaxial fan by rotating the driving pulley 19 and inducting the outside air from an intake port 21 of a transmission case 17, allows the air to flow around the pulley 19 in the direction of a driven pulley 23 in the rear. And a rearward flow of the cooling air, being divided by the upper 28a and the bottom 28b of a straightening plate 28 provided between the upper 24a and the bottom 24b of a belt 24 and allowed to flow with no hesitation between the pulleys 19, 23 while effectively performing the cooling due to the running of the belt 24, is discharged from an exhaust port in the rear. |
