| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively obtain a dynamic damper capable of easily discharging a foreign substance that enters between a driving force transmission shaft and itself.SOLUTION: The dynamic damper 10 includes a cylindrical body part 30, a mass part 32 storing a weight 46, and a connection support part 34 connecting these body part 30 and mass part 32. In the body part 30, a through-hole 36 is formed along its longitudinal direction, and a drive shaft 14 is passed through this through-hole 36. In the inner wall of the through-hole 36, four discharging grooves 38a-38d substantially in a semicircular shape in cross section are depressed. The respective discharging grooves 38a-38d are extended along the longitudinal direction of the body part 30 as in the through-hole 36. |
