Sprocket cover
A cover for the sprocket ( 5 ) of a bicycle or electric bicycle consists of a cover plate ( 9 ) which is arranged between the chain wheel ( 5 ) and the equilateral crank ( 2 ) and fastened without screws on the inside of the crank.
1. An electric motor assembly for a bicycle, comprising
an electric motor with a shaft journal,
a chain wheel on the shaft journal,
a pedal crank, and
a chain wheel cover plate provided between the chain wheel and the pedal crank and at least having a centre opening, wherein the cover plate is screwlessly and non-rotatably connected with said pedal crank at the side facing the chain wheel and forms an integral part with said pedal crank for mounting to the shaft journal of the electric motor.
2. The electric motor assembly according to claim 1 , wherein an annular extension is formed on the pedal crank for receiving the shaft journal of the pedal bearing shaft end and the cover plate is inextricably linked with this annular extension.
3. The electric motor assembly according to claim 2 , wherein the central opening of the cover plate has a diameter which is matched to the outer diameter of the annular extension of the pedal crank so that the cover plate is swaged on the annular extension of the pedal crank.
4. The electric motor assembly according to claim 2 , wherein the covering plate in the region around its central opening is pressed to the annular extension of the pedal crank.
5. The electric motor assembly according to claim 1 , wherein the cover plate is non-rotatably connected with the pedal crank, by at least partially deforming the material of the pedal crank.
6. The electric motor assembly according to claim 1 , wherein the cover plate is like a recessed plate in the region of its connection with the pedal crank.