The present invention provides a bicycle crank transmission apparatus comprising a hollow shaft member; a base plate which is coupled to the aforementioned shaft member on one side and installed securely on a bottom bracket featuring a spindle on the other side; a chainring housing which is coupled to the aforementioned shaft member in a way that allows its rotation and has a ring gear installed securely inside; a reduction gear unit arranged in the middle of the aforementioned ring gear; a directly-coupled ratchet unit installed on the aforementioned ring gear; a crank cover where a coupling shaft coupled to the aforementioned spindle is perpendicularly provided in the center and where clutch ratchet teeth, which are engaged with the aforementioned directly-coupled ratchet unit, and directly-coupled ratchet teeth are vertically stacked on the internal wall surface; and a sun gear installed on the aforementioned coupling shaft in such a way that it only rotates in clockwise direction and partially engaged with the aforementioned reduction gear unit.
BICYCLE CRANK TRANSMISSION APPARATUS
FAHRRADKURBELGETRIEBEVORRICHTUNG
APPAREIL DE TRANSMISSION À PÉDALIER DE BICYCLETTE
2021-03-31
Patent
Electronic Resource
English