Dynamischer Dämpfer

摘要

A dynamic damper includes a cylindrical mass metal element, a cylindrical elastic-body attachment portion, a cylindrical elastic-body connection portion, and an elastic-body covering portion. The elastic-body attachment portion is formed from a rubber elastic body and coaxially disposed inside the mass metal element while a predetermined radial distance is maintained therebetween. The elastic-body connection portion is formed from a rubber elastic body and disposed between the mass metal element and the elastic-body attachment portion so as to connect them. The elastic-body covering portion covers the outer circumferential surface of the mass metal element. The elastic-body connection portion and the elastic-body covering portion are not bonded to the mass metal element. A plurality of protrusions are formed and arranged circumferentially on the inner circumferential surface of the mass metal element.