CHAINWHEEL AND CRANK ASSEMBLY COMPRISING SUCH CHAINWHEEL

摘要

A chainwheel intended for a crank assembly of a bicycle, home trainer, go-cart or like human-powered device provided with a crank assembly, wherein the chainwheel is non-circular and is point-symmetrical about an imaginary central point and comprises eight successive, different zones A-D, A'-D', wherein the fifth through eighth zones A'-D' correspond to the first through fourth zones A-D, respectively, in that these fifth through eighth zones A'-D' are point-symmetrical relative to these first through fourth zones A-D, wherein zones pass through particular curves which are accurately defined and wherein the angular position of the chainwheel relative to the crank is also accurately defined, such that the peak load of the knee joint is minimized, while the crank power that can be provided is optimized.