Self-tensioning sprocket for power transmission chain

摘要

A split sprocket (2) for use with power transmission chains (3), with a spring (33) rotationally biasing the halves (16)(17) of the sprocket, in which the relative rotation of the two halves under the influence of the spring caused an effective increase in diameter of the saddles (25) between the teeth of the sprocket, thereby automatically taking up tension in a chain.