Patent ID: 8663044

Claim:
A sprocket assembly, comprising: a sprocket body; and a collar mounted in the sprocket body; wherein the sprocket body is formed by a plurality of sprocket rings which are juxtaposed to each other; the sprocket body has a first side provided with a fitting portion and a second side provided with a mounting tube; the fitting portion of the sprocket body has an inner wall provided with a receiving space connected to the mounting tube of the sprocket body; the receiving space of the fitting portion and the mounting tube of the sprocket body are surrounded by the sprocket rings; each of the sprocket rings surrounding the receiving space of the fitting portion has an inner wall provided with a plurality of flanges and a plurality of recesses between the flanges; each of the sprocket rings surrounding the mounting tube has an inner wall provided with a plurality of connecting ribs and a plurality of spaces between the connecting ribs; the connecting ribs are formed on and extended between the mounting tube and each of the sprocket rings surrounding the mounting tube; each of the spaces rings surroundin the mounting tube is aligned with the respective recess of each of the sprocket rings surrounding the receiving space of the fitting portion; the sprocket rings surrounding the mounting tube are connected with the mounting tube by the connecting ribs.