Apparatus for changing speed of bicycles

Abstract

An apparatus for changing speed of bicycles, more particularly, an apparatus for changing speed of bicycles that changes speed of bicycles using inner gears inside a rear wheel hub and controlling the inner gears with controllers mounted on a hub shaft. The apparatus is comprising: a driven sprocket receiving the driving force of a driving sprocket; a speed controlling portion, which is comprising a carrier that is fixed to one side of the driven sprocket, a plurality of planetary gears is installed; at least two sun gears that are engaging with each step of the planetary gears and ratchet-teeth is formed along inner circumference; a ring gear that is engaging with the other side of the planetary gears; an output portion, which is comprising a hub shell transferring the driving force to a rear wheel by means of the carrier and the ring gear; a clutch means that is mediating the driving force selectively with being mounted between the carrier and the hub shell, and the ring gear and the hub shell; and a speed-change controlling portion, which is comprising a hub shaft having a pawl-positioning portion; at least two set of pawls which are engaging or releasing with the ratchet-teeth of the at least two sun gears; a pawl-controlling ring that is controlling the position of the at least two set of pawls; a transforming disk having a groove along outer circumference, that a hooking portion is formed a certain position on the outer circumference, in order to transform the position of the pawl-controlling ring via a mediating portion; a spring that is for restoring position of the transforming disk to original position; a spacing portion enabling the transforming disk to rotate freely.

Dependencies are inferred from the claim text.