| 摘要 |
A wheel, such as a pulley or a sprocket, includes a hub and a sleeve. The hub has an outer surface with a plurality of substantially axially aligned teeth. The sleeve has: (a) an inner surface with a plurality of substantiall y axially aligned grooves that engage the teeth of the hub; and, (b) an oute r band engagement surface that engages a band, such as a belt or a chain. As the band tends to become misaligned with respect to the wheel, the sleeve a utomatically moves axially with respect to the hub to correct the misalignme nt.
|
