Patent ID: 6872158
Filing Date: 2005-03-29
Classification: F16G,F16H,Y10T

Abstract:
1. A silent chain transmission device comprising a sprocket having sprocket teeth, and an elongated chain in mesh with said sprocket, said chain comprising links disposed in succession in the longitudinal direction of the chain, each link being composed of a plurality of component link plates, and the link plates of each successive pair of links being interleaved with each other and articulably connected by a connecting pin, each said link having a pair of link teeth with inside engaging surfaces facing each other, and outside engaging surfaces facing away from each other, the inside engaging surfaces beginning engagement with the sprocket by contact between the sprocket teeth and the inside engaging surfaces of the link teeth, and seating on the sprocket by contact between the sprocket teeth and the outside engaging surfaces of the link teeth, wherein the link tooth engaging surfaces of said sprocket teeth are shaped by a first hob cutter, the inside and outside engaging surfaces of the link plates have the same profile as the profile of the teeth of said first hob cutter, wherein the pitch of the chain is equal to the pitch of said first hob cutter, wherein each link plate has an inwardly curved portion, wherein the inside engaging surfaces of each link plate diverge from each other and are contiguous with said inwardly curved portion of the link plate, and wherein said sprocket has tooth heads shaped by a secondary hob cutter having a hob bottom shallower than that of the first hob cutter, whereby the tooth heads of the sprocket are smaller than tooth heads formed by said first hob cutter, and thereby avoid contact interference with said inwardly curved portions of the link plates.