A bicycle brake includes a brake box, a brake ring installed in the brake box, and a brake disc fixedly connected to an axle. Its brake ring is bent into a circle by a steel strip, and the straight ends bent outward at both ends are supported by springs.
The flywheel is fixed at the right end of the rear axle through internal thread, keeps the same plane with the sprocket, and is connected with the sprocket through a chain to form the driving system of the bicycle. Structurally, it can be divided into two categories: single-stage flywheel and multi-stage flywheel.
Origin:
Originated in Europe. 1790, Count Sifrak of France put two wheels on the wooden horse, and people rode on them and pushed forward. This is the so-called wooden horse wheel. 18 16, baron Karl von Drais of Germany invented a wooden wheeled vehicle with handlebars that can control the direction, and obtained a British patent in 18 18.
1839, kirkpatrick Macmillan, a Scottish blacksmith, made an iron bicycle, the rear wheel of which was driven by a crank-connecting rod structure. 186 1 year, French Messau and his son invented a bicycle with a big front wheel and a small rear wheel. The front wheel is equipped with a crank and a rotatable pedal, which was exhibited at the Paris Expo in 1867.
1874, H.J.Lawson of Britain adopted chain transmission structure on bicycles. 1886, stahly in Britain used ball bearings and brakes to change the front and rear wheels to the same size. From 65438 to 0888, pneumatic rubber tires were successfully used in Deng Lupu, England, and bicycles were basically perfect.