Patent ID: 8833536
Filing Date: 2014-09-16
Classification: B60B,F16D

Abstract:
1. A ratchet mechanism for a bicycle hub, comprising: a hub; an engaging portion connected to an end of the hub; a ring fixed in the hub and having a tapered surface defined in an inner periphery thereof, a flange formed in the inner periphery of the ring; a driving unit located between the hub and the engaging portion, the driving unit having a driving portion, a first ratchet seat formed on a side of the driving portion and having multiple first ratchet teeth extending axially therefrom, and a passive unit located in the tapered surface and corresponding to the driving unit, the passive unit being movable along the tapered surface and having a passive seat which has a tapered outer face matched with the tapered surface, the passive seat having a stop portion which is stopped by the flange, the passive seat having a second ratchet seat on a side thereof which faces the driving portion, the second ratchet seat having multiple second ratchet teeth engaged with the first ratchet teeth.