Patent ID: 6857623
Filing Date: 2005-02-22
Classification: F16F

Abstract:
1. 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 being fixed at large diameter end portions thereof to said bevels, respectively, wherein said elastic support members have smaller end portions extending axially outwardly from the beveled axial end faces of said metallic mass member such that said smaller diameter end portions are freely elastically deformable without interference from said metallic mass member and the rod shaped oscillating member, wherein said elastic covering layer is fixed in close contact with a surface of said metallic mass member without using an adhesive, and wherein said surface of the metallic mass member has a ten-point mean roughness Rz within a range from 3 μm to 200 μm.