Patent ID: 6533107
Filing Date: 2003-03-18
Classification: F16G,F16H

Abstract:
A silent chain power transmitting apparatus comprising:an endless silent chain composed of a multiplicity of link plates interleaved and articulately connected together by connecting pins, each link plate having a pair of generally V-shaped link teeth and a pair of pin holes for fitting the connecting pins, the V-shaped link teeth having inside and outside flanks; and at least two sprockets spaced from each other and having different numbers of teeth for mesh with the V-shaped link teeth of the link plates, wherein when the silent chain starts to mesh with each of the sprockets, the inside flank of one link plate comes in contact with a tooth of the sprocket, and as the silent chain is wrapped around and subsequently placed in full meshing with the sprocket, the outside flank of the preceding link plate comes in contact with and subsequently becomes completely seated on the same teeth of the sprocket, thereby ensuring that the silent chain transmits power between the sprockets,wherein the sprockets each have a tooth form formed by hobbing with a hob cutter having teeth profiled similarly with the profile of a series of trapezoidal teeth formed by the inside flanks of the longitudinally overlapping link plates described previously to cut the periphery of a cylindrical workpiece with an amount of addendum modification set in such a manner that an engagement height of the inside flank at the onset of the meshing engagement between the silent chain and the sprocket is in equal to a center distance between the center of the sprocket and the center of each connecting pin when the silent chain is wrapped around and seated on the sprocket, andwherein the outside flanks of the silent chain have a first portion profiled by an envelope that is tangent to every one of a group of tooth forms of the sprockets when the silent chain is wrapped around the sprockets with different numbers of teeth.