Patent ID: 8578816

Claim:
A connecting and adjusting structure for a crank assembly being used in a bottom bracket of a bicycle, and comprising: a first connector, a second connector, a first crank, a second crank, a first ball bearing, a second ball bearing, a retaining ring, a dustproof cover, a screw, and a chainwheel, wherein a first tube of the first connector includes a first hollow portion formed therein, the first connector includes a first bearing seat disposed on a front end of the first tube thereof to receive the first ball bearing, and the first bearing seat includes a first engaging tab, a first adjusting rib, and the first tube mounted around a rear side thereof, the second connector includes a second bearing seat disposed on a rear end of a second tube thereof to receive the second ball bearing, the dustproof cover, and the retaining ring, the second bearing seat includes a second engaging tab, a second adjusting rib, and the second tube fixed on a front side thereof, the second crank includes a central shank disposed on a center thereof, and the central shank is hollow and includes a plurality of T-shaped teeth arranged around a distal end thereof and second internal screws arranged therein, the first crank includes a hollow post mounted on a center thereof, the hollows post includes a Tee groove fixed therein to engage with the T-shaped teeth of the central shank of the second crank, and the screw is inserted through the hollow post of the first crank to be screwed with the second internal screws of the first crank.