JPS6432418A - Rotary dynamic damper - Google Patents

Abstract

PURPOSE:To constitute the titled rotary dynamic damper of the same plate material, and to decrease the cost of parts by allowing a viscoelastic member to pass through hole parts provided in accordance with extended parts being adjacent to a projecting part of an inertia body and a recessed part of a holding member, respectively, and holding them as one body. CONSTITUTION:An inertia body 6 is provided with four projecting parts 6a in its inside peripheral part, and a holding member 7 is provided with four recessed parts 7a corresponding to the projecting parts 6a of the inertia body 6 in the outside peripheral part. Both these constituting members are punched and formed from the same disk-like stock and have the same thickness. Their provided positions are set so that an extended part 7b being adjacent to the recessed part 7a of the outside peripheral part of the holding member 7 and the projecting part 6a of the inside peripheral part of the inertia body 6 are overlapped, and in its overlapped part, a hole for passing through the holding member 7 and the inertia body 6 is formed in the holding member 7 and the inertia body 6, respectively, and in its position, a viscoelastic member 8 is formed in a columnar shape by injection molding. In such a way, an inexpensive rotary dynamic damper can be supplied.