Patent ID: 7032983

Claim:
A silent and reduced vibration chainwheel for meshing with a chain, and comprising: a disk having an outer edge, two opposite sides and at least one recess; multiple teeth formed with and extending radially out from the outer edge of the disk and forming a bottom land between adjacent teeth and each tooth having a tooth profile with a pitch point; and an energy absorber made of resilient material and mounted at the outer edge of the disk in the at least one recess to absorb shock generated when the chainwheel and the chain contact each other, thereby reducing both vibrations and noise, wherein the teeth are hollow to form a passage in each tooth; the at least one recess in the disk is implemented with a continuous annular groove defined around the outer edge, and extending through and communicating with the passages in the teeth; and the energy absorber comprises a continuous resilient annular strip mounted in the annular groove and extending through the passages in the teeth and around the edge.