Patent ID: 8020677
Filing Date: 2011-09-20
Classification: F16F,Y10T

Abstract:
1. A vibration damping device comprising: a hollow housing adapted to be fastened to a component targeted for damping, and having an accommodating space; and an independent mass member which is accommodated independently within the hollow housing without being fastened thereto, the vibration damping device adapted to produce vibration damping action based on the independent mass member striking against the hollow housing, wherein the hollow housing includes a fastening frame for fastening to the component targeted for damping, and a housing main body providing the accommodating space formed in an interior thereof and intended for attachment to the fastening frame, the fastening frame is a press-formed component of a metal plate that has been bent into a “U” shape, and includes: a base plate portion furnished with a section for fastening to the component targeted for damping; a top plate portion disposed spaced apart from and in opposition to the base plate portion; a back plate portion formed connecting the base plate portion with the top plate portion; side panel portions that respectively project inward at widthwise edges of the base, top and back plate portions, and extend between the base, top, and back plate portions; and an opening for insertion of the housing main body formed between edge portions of the base plate portion and the top plate portion on sides thereof opposite from the back plate portion, a first spring projection and a second spring projection that project inward are integrally formed on the back plate portion and on one of the base plate portion and the top plate portion of the fastening frame, and a catch projection that projects inward is integrally formed on an other of the base plate portion and the top plate portion; and with the housing main body inserted between the opposing faces of the top plate portion and the base plate portion through the opening in the fastening frame, an urging force of the first spring projection is directed against the housing main body from one of the top plate portion and the base plate portion towards the other thereby holding the housing main body pressed against the other of the top plate portion and the base plate portion, while an urging force of the second spring projection is directed against the housing main body towards the opening side from the back plate portion causing the housing main body to become engaged by the catch projection, for attaching the housing main body to the fastening frame and preventing the housing main body from slipping out through the opening of the fastening frame.