Cylindrical dynamic damper whose size is compact and whose mass member has large mass

A dynamic damper for mounting on a rod-shaped oscillating member, comprising:

• a generally cylindrical metallic mass member formed of sintered metal or forging, adapted to be disposed radially outwardly of the oscillating member;
• a pair of elastic support members formed on and extending axially outwardly and radially inwardly from axially opposite sides of said metallic mass member to provide a tapered cylindrical configuration, said pair of elastic support members being adapted to elastically support said metallic mass member with respect to the rod-shaped oscillating member;
• and
• an elastic covering layer integrally formed with said pair of elastic support members and fixed in close contact with substantially an entire surface area of said metallic mass member for covering substantially the entire surface area of said metallic mass member, said metallic mass member having bevels in a form of tapered cylindrical surfaces extending over a circumference of said metallic mass member, said bevels being formed at radially inner edges of axially opposite end faces of said metallic mass member, respectively, each of said bevels extending over a corresponding one of said axially opposite end faces and an inner circumferential surface of said metallic mass member to thereby chamfer the corresponding one of said radially inner edges, said pair of elastic support members are fixed at large diameter end portions thereof to said bevels, respectively,
• wherein said elastic support members have respective outer circumferential surfaces whose large-diameter end portions are located on the respective bevels of said metallic mass member, as seen in an axial projection of said dynamic damper.

A dynamic damper for mounting on a rod-shaped oscillating member comprising:

• a generally cylindrical metallic mass member formed of sintered metal or forging, adapted to be disposed radially outwardly of the oscillating member;
• a pair of elastic support members formed on and extending axially outwardly and radially inwardly from axially opposite sides of said metallic mass member to provide a tapered cylindrical configuration, said pair of elastic support members being adapted to elastically support said metallic mass member with respect to the rod-shaped oscillating member;
• and
• an elastic covering layer integrally formed with said pair of elastic support members and fixed in close contact with substantially an entire surface area of said metallic mass member for covering substantially the entire surface area of said metallic mass member, said metallic mass member having bevels in a form of tapered cylindrical surfaces extending over a circumference of said metallic mass member, said bevels being formed at radially inner edges of axially opposite end faces of said metallic mass member, respectively, each of said bevels extending over a corresponding one of said axially opposite end faces and an inner circumferential surface of said metallic mass member to thereby chamfer the corresponding one of said radially inner edges, said pair of elastic support members are fixed at large diameter end portions thereof to said bevels, respectively,
• wherein said metallic mass member includes a plurality of through holes formed therethrough so as to extend in an axial direction of said metallic mass member, said plurality of through holes being filled with said elastic covering layer.