| 摘要 |
PROBLEM TO BE SOLVED: To provide a warning sound notification generator or a warning sound generator with a light emitting part generating warning sound during low speed traveling of an electric vehicle to pedestrians but generating no warning sound during high speed traveling.SOLUTION: A disc-shaped container 1 is mounted in a rotation center part on an external surface side of a wheel, four fan-surface-shaped cavities 5 are provided in the container 1, a pocket 7 is formed as a recessed part at an outer peripheral wall of each of the cavities 5, and a ball 8 having a size capable of freely falling and rolling into the pocket 7 is filled into each of the cavities 5. During low speed traveling, the ball 8 freely moves in the cavity 5 and collides with an inner wall of the cavity 5 to generate warning sound. During high speed traveling, the ball 8 entering the pocket 7 is not capable of escaping from the pocket 7 by receiving centrifugal force to generate no warning sound. The warning sound generator with the light emitting part may be made by combining the warning sound generator with a generator and an LED. |
