| 摘要 |
PROBLEM TO BE SOLVED: To suppress rattling and vibration generating due to heat generation of a centrifugal clutch.SOLUTION: On a front surface of a clutch drum 52, a substantially rectangular-shaped tabular protrusion 52A and a hole part 52B adjacent to this and having the same shape are formed on a circumference around a clutch shaft 53. Here, in the protrusion 52A, it is opposed to a movement direction when rotating, and an angle (inclination angle) &thetas; is provided with the radial direction, so that the protrusion 52A plays a role as a blade for generating an airflow. Therefore, the clutch drum 52 can be cooled by using this airflow. The hole part 52B is provided on a back surface side with respect to the movement direction of the protrusion 52A, so that air is likely to flow in from the front side toward the hole part 52B. |
