| 摘要 |
An internally geared bicycle hub cover is provided to cover an end of internally geared bicycle hub. The cover has a generally cup-shaped annular housing, an inner annular seal and an outer annular seal. The generally cup-shaped annular housing includes a base portion defining a centrally located driving member opening and an outer rim portion located radially outward of the base portion with at least two radially projecting protuberances configured and arranged to engage a cover mating structure on an internally geared bicycle hub. The inner annular seal is disposed on the base portion of the annular housing about the driving member opening. The outer annular seal is disposed on the outer rim portion of the annular housing face in a substantially opposite radial direction from the radially projecting protuberances. The outer annular seal is provided on the annular housing to wedge the protuberances into a corresponding annular groove or notches on the hub transmission/shell.
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