Patent ID: 8696502
Filing Date: 2014-04-15
Classification: F16H

Abstract:
1. A chain transmission mechanism, comprising: a chain having pluralities of link plates alternately linked by pins; said chain having guide rollers rotatably supported coaxially with said pins; at least a first sprocket having a plurality of teeth engaging between two adjoining pins, and tooth spaces between said teeth receiving said pins; guide rails provided with arcuate tracks alongside the teeth of said sprocket to contact said guide rollers and determine a track of said chain; and tooth bottoms at the bottom of said tooth spaces, said bottoms being formed into a shape not contacting with the pins of said chain when said chain is wound around the sprocket along the track along said guide rail; wherein the plurality of teeth of said sprocket have a pitch circle which has a smaller diameter than the pitch circle of the pins of said chain as they travel in the arcuate tracks of said chain.