Patent ID: 8727930

Claim:
A forced speed changing apparatus of a bicycle, comprising: a hub shaft over which a first pawl and a second pawl are mounted; a pawl controlling ring which controls the first and the second pawls; a carrier which is disposed outside the pawl controlling ring; a first sun gear engageable with the hub shaft by operation of the first pawl; a second sun gear engageable with the hub shaft by operation of the second pawl; a planetary gear engageable with the first sun gear, the second sun gear, or both; a hub shell which receives the carrier and has a ring gear engageable with the planetary gear; a speed changing unit configured to rotate the pawl controlling ring; a pressure member disposed at the pawl controlling ring; and a spline groove formed at an inner circumference of the carrier, wherein the pressure member is movable by rotation of the carrier so as to press the first pawl and to release engagement between the first pawl and the first sun gear, and wherein the pressure member is movable by rotation of the carrier so as to press the second pawl and to release engagement between the second pawl and the second sun gear.