Patent ID: 8336693
Filing Date: 2012-12-25
Classification: B60B

Abstract:
1. A bicycle hub, comprising: a housing having one end formed with an inner hole with an inner ring surface and the inner hole having a ratchet ring formed on the inner ring surface; a driving base, with a first end and a second end, mounted in the inner hole of the housing, having the first end to rotate relative to the housing, an outer surface of the first end having a plurality of annular accommodating grooves, wherein the outer surface of the first end of the driving base has a notch that is annularly formed and cuts through each of the accommodating grooves; and an engaging unit, having a plurality of claws installed in the accommodating grooves and a plurality of elastic elements, each elastic element engages a respective claw and urges the claw against the ratchet ring; wherein each claw has a pivotal part and an engaging part, the pivotal part being placed in a corresponding accommodating groove and the engaging part being opposite to the pivotal part for engaging the ratchet ring, the engaging part of each claw, using the pivotal parts as an axis, swings from a first position engaged with the ratchet ring to a second position away from the ratchet ring, each claw further has a claw groove extending along a rotational direction of the driving base, each claw groove is defined with an acting end and a limiting end, each elastic element having a first end and a second end, each elastic element being placed in the claw groove of one claw with only the first end of each elastic element being attached into the driving base and the second end pressing against the acting end of the claw groove, so that the engaging part of each claw rises out of the accommodating groove, the limiting end of each claw groove is restricted by the elastic element from rising out of a corresponding accommodating groove, and the engaging part of each claw swings to the first position and engages with the ratchet ring on the housing when the first end of the driving base rotates in one direction.