Patent ID: 7726454

Claim:
A bicycle wheel hub assembly comprising: (a) a wheel hub formed with a wheel hub shell disposed coaxially about a wheel mounting shaft, whereby said wheel hub shell is journaled for rotation about said wheel mounting shaft and a cylindrical annular hub cavity is defined therebetween; (b) a first power transmission sleeve disposed within said hub cavity and defining a first power transmission sleeve outer surface and a first power transmission sleeve inner surface that is eccentric relative to said first power transmission sleeve outer surface; (c) a second power transmission sleeve disposed within said hub cavity and defining a second power transmission sleeve outer surface and a second power transmission sleeve inner surface that is eccentric relative to said second power transmission sleeve outer surface, wherein said second power transmission sleeve is movably attached to said first power transmission sleeve; (d) a sprocket having sprocket teeth projecting radially relative to a drive axis, with a central cylindrical wheel mounting shaft opening defined through said sprocket to receive said wheel mounting shaft coaxially therewithin; (e) a drive sleeve projecting from said sprocket axially toward said hub and defining a first cylindrical drive sleeve outer surface that is eccentric relative to said wheel mounting shaft opening and a second cylindrical drive sleeve outer surface that is eccentric relative to said wheel mounting shaft opening and eccentric relative to said first cylindrical drive sleeve outer surface, and said drive sleeve is disposed within said first and second power transmission sleeves, such that said first power transmission sleeve inner surface abuts said first cylindrical drive sleeve outer surface and said second power transmission sleeve inner surface abuts said second cylindrical drive sleeve outer surface; and (f) a drag mechanism mounted on said wheel mounting shaft to retard rotation of said first and second power transmission sleeves relative to said drive sleeve.