TH91065A - Bicycle transmission system - Google Patents

Abstract

The DC60 invention provides a novel bicycle power transmission system by arranging a gear set mounted on the rear axle that rotates independently of the rear wheel, or does not drive the rear wheel. A second gear set receives power from the rear axle-mounted set to drive the rear wheel, which is equipped with a sprocket on the inner rim of the rear bicycle wheel, thereby reducing the effort required to pedal the bicycle.

Claims (3)

1. The bicycle's drive system consists of a first chainring (1) attached to the bicycle's axle (2), transmitting power to the second chainring (3) via the chain (4). Specifically, this second chainring (3) consists of a coaxial sprocket (31) and a axial sprocket (32) mounted on the rear axle of the bicycle, rotating freely relative to the rear axle, and a third chainring (5) consisting of a coaxial sprocket (51) and a axial sprocket (52). The third gear (5) is mounted on a freely rotating axle which is mounted on the rear fork of the bicycle. Power is transmitted from the second gear (3) to the third gear (5) via the chain (6), and on the inner rim of the rear wheel there is a cogwheel (7) which meshes with the teeth of the main gear (52) of the third gear (5). 2. The bicycle's power transmission system, as per item I, where the first chainring (l) is a gear set with gears of varying sizes in a sequential order. 3. The power transmission system of a bicycle, according to item 1 or 2, where the second (3) sprocket set is a gear set with different sized sprockets in descending order.