| 摘要 |
PROBLEM TO BE SOLVED: To reduce an adverse effect caused by heat generation around a clutch.SOLUTION: A centrifugal clutch 50 is covered by a clutch cover 100A provided in a gear case 100. A fan case 90 is large and made of a resin material in order to reduce weight while the gear case 100 can be made of a metal having high heat resistance and mechanical strength because the gear case 100 or the clutch cover 100A is small. Therefore, even if the temperature of the centrifugal clutch 50 is increased, looseness is restrained from occurring in a bearing 105, etc. Because it is not necessary to air-cool the centrifugal clutch 50, it is not necessary to provide a special structure to air-cool the centrifugal clutch 50, and it is not necessary to provide a wide gap between the clutch cover 100A covering the centrifugal clutch 50 and the centrifugal clutch 50.SELECTED DRAWING: Figure 1 |
