US 6,981,579 B2
Dynamic damper
Naohito Kuwayama, Nagoya (Japan); and Takashi Hayashi, Komaki (Japan)
Assigned to Tokai Rubber Industries, Ltd., Komaki (Japan)
Filed on Aug. 26, 2003, as Appl. No. 10/648,947.
Claims priority of application No. 2002-247613 (JP), filed on Aug. 27, 2002; and application No. 2003-151499 (JP), filed on May 28, 2003.
Prior Publication US 2004/0041318 A1, Mar. 04, 2004
Int. Cl. F16F 15/02 (2006.01); G01B 11/28 (2006.01)
U.S. Cl. 188—379 8 Claims
OG exemplary drawing
 
1. A dynamic damper comprising:
a cylindrical metallic mass member including a plurality of engaging recesses formed at least at axially opposite end portions thereof so as to be open in an outer circumferential surface thereof;
a cylindrical fixing member of an elastic body having an inner diameter smaller than an inner diameter of said metallic mass member;
a connecting member of said elastic body being adapted to connect said metallic mass member with respect to said fixing member;
a covering member of said elastic body being integrally formed with said cylindrical fixing member and said connecting member, and covering said metallic mass member; and
a plurality of engaging projections projected into and filling approximately completely said plurality of recesses of the metallic mass member, respectively, said engaging projections being integrally formed with said covering member,
wherein said connecting member and said covering member being fixed to said metallic mass member without using adhesive,
wherein said dynamic damper is adapted to be disposed about and fixedly mounted on a rotative member as a damping object such that said metallic mass member surrounds the rotative member with a given gap therebetween, and is elastically connected to the rotative member via said connecting member, and
wherein said connecting member, said covering member and said engaging projections are directly formed onto said metallic mass member through vulcanization of a rubber material for forming thereof so that said plurality of engaging projections are held in contact and fixedly engaged with said plurality of engaging recesses by utilizing shrinkage of said covering member in a radially inward direction thereof.