Multi-geared bicycle transmission assembly comprising internal gear sets

摘要

A transmission assembly for a bicycle which is able to achieve variations in rotational force and velocity through internal gearing mechanisms which require no variation in sprocket diameter. The transmission assembly includes a front and rear transmission means, and a chain which connects them. Each transmission means includes one or more sprockets and gear sets with which the chain connects. Each gear set then includes a sun gear, a plurality of planetary pinions which rotate and revolve around the sun gear, a ring gear encasing the planetary pinions, and a carrier to which the planetary pinions are attached. This assembly helps prevent the chain from derailling, quickens the shifting process, and simplifies the structure and construction of transmission assemblies for bicycles.