Dynamic damper and propeller shaft

摘要

This invention provides a dynamic damper 10, in which convex portions 21 protruded in the direction of the inside diameter are provided at a plurality of positions along the circumference of the outer pipe 20 and an elastic body 40 is held between the convex portion 21 and the outer circumference of the weight 30. A stopper portion 32 capable of engaging the convex portion 21 of the outer pipe 20 in the axial direction of the pipe is provided on the weight 30. An insertion guide face 23 provided at an end portion in the axial direction of the convex portion 21 of the outer pipe 20, and the convex portion 21 of the outer pipe 20 makes the insertion guide face 23 slide against the stopper portion 32 of the weight 30 to enlarge the diameter of the convex portion elastically to surpass the stopper portion 32 so that it fits to the outer circumference of the weight 30.