Sprocket

A multipart sprocket for transmitting torque in a gear, in which a gear rim interacts via its peripheral gearing in form-fitting manner with a chain that has a given chain division period, and in which an inner ring for fastening the multipart sprocket to a wheel hub has through-holes that lie on a common hole circle, hereby characterized in that the inner ring is composed of a polygon skeleton that is formed by a ring-frame, and has means for fastening a gear rim having largely circular ring-shaped contour, wherein the means for fastening are formed by gear-rim lugs, which have radially inwardly directed openings, which correspond in form-fitting manner to radially outwardly directed inner ring lugs of inner ring.

A multipart sprocket for transmitting torque in a gear, in which a gear rim interacts via its peripheral gearing in form-fitting manner with a chain that has a given chain division period, and in which an inner ring for fastening the multipart sprocket to a wheel hub has through-holes that lie on a common hole circle, hereby characterized in that the inner ring is composed of a polygon skeleton that is formed by a ring-frame, and has means for fastening a gear rim having largely circular ring-shaped contour, wherein a gear rim region of the sprocket is formed by a package of parallel layers of different materials, whose thickness represents the tooth width of the gear rim region, the middle layer of the package being composed of a material with high strength, and the adjacent layers being formed of materials of lower strength, and the means for joining inner ring and gear rim are formed by the interaction of the package in a composite of parallel layers.

A multipart sprocket for transmitting torque in a gear, in which a gear rim interacts via its peripheral gearing in form-fitting manner with a chain that has a given chain division period, and in which an inner ring for fastening the multipart sprocket to a wheel hub has through-holes that lie on a common hole circle, hereby characterized in that the inner ring is composed of a polygon skeleton that is formed by a ring-frame, and has means for fastening a gear rim having largely circular ring-shaped contour, wherein a gear rim region of the sprocket is formed by a package of parallel layers of different materials, whose thickness represents the tooth width of the gear rim region, the middle layer of the package being composed of a material with high strength, and the adjacent layers being formed of materials of lower strength, and the middle layer of the package is made of a high-strength steel alloy, and the adjacent layers are formed of low-strength light metal.