Ohlandt, Greeley, Ruggiero & Perle, L.L.P.
Hub transmission mechanism with a seal member
 A hub transmission mechanism includes an axle extending through a spoke-mounting barrel such that a right axle portion thereof extends outwardly from the spoke-mounting barrel. A sprocket-mounting member is sleeved around the right axle portion, and includes an outer shell coupled with the spoke-mounting barrel, a bearing unit disposed within the outer shell around the axle, and a bearing retention member that is disposed in the outer shell around the axle outboard to the bearing unit. A flexible seal member is disposed within the outer shell between the bearing unit and an outward flange of the bearing retention member, and includes an L-shaped cross-sectioned outer ring which is in tight engagement with the outer shell and which has a thick left portion and a thin right portion that is thinner than the thick left portion and that has an inner diameter larger than that of the thick left portion. The seal member further includes a truncated conical inner ring which projects inclinedly and inwardly from the thick left portion of the outer ring and which has a smallest inner diameter right end that is sleeved slidably over the bearing retention member adjacent to the outward flange. 
Kun Teng Industry Co., Ltd.
B B B
B60B B60B B60B
inventional inventional inventional
Hubert
Chen