Patent ID: 6656072
Filing Date: 2003-12-02
Classification: B62M,F16H

Abstract:
A chain transmission assembly comprising:a sprocket having a first side and a second side; an annular resilient member positioned on at least one side of said sprocket; and a roller chain having pin link plates and roller link plates which are identically formed and symmetrical in a longitudinal direction and include constricted portions, said pin link plates each being fixed by pins, and said roller link plates being wrapped around the sprocket and being received by the resilient member, said resilient member absorbing noise occurring when the roller chain meshes with the sprocket by said roller link plates engaging said resilient member, wherein projecting portions are formed between outwardly facing convex-shaped arcs of an outer surface of said annular resilient member, the projecting portions corresponding to said constricted portions of the pin link plates and the roller link plates, and wherein said projecting portions collide with said constricted portions of said link plates upon rotation of the sprocket, thereby pushing said roller chain outward in a radial direction by a predetermined distance, and thereby causing a reduction in an inward radial drop of rollers of the chain by an amount equal to said predetermined distance.