Introduction to Bicycles
Bicycles were introduced into China from Western countries and are usually small two-wheeled land vehicles. Bicycles are now spread all over the world, entering every household, and are the most common means of transportation for people. After riding a bicycle, people use their foot pedals as power, which can be used as an environmentally friendly means of transportation for transportation and travel; more and more people use bicycles as fitness equipment for riding exercises and bicycle outings; bicycles themselves are also an item Sports competitions include road cycling, mountain bike, track cycling, stunt bike racing, etc.
The history of bicycles
In 1818, B.K.von Dries in Germany invented a wooden two-wheeled bicycle with handlebars and two pedals.
In 1839, K. Macmillan of Scotland made an iron bicycle that was driven by a crank-link mechanism to drive the rear wheels and pedaled.
In 1861, the French Mischau and his sons invented a bicycle with a large front wheel and a small rear wheel, with a crank and a rotating pedal on the front wheel, and it was exhibited at the Paris Exposition in 1867, which once set off a bicycle fever.
1869 British W.F. Renault used spokes to tighten the rim, made a frame with steel pipes, and installed a solid rubber band on the rim to reduce the weight of the bicycle.
In 1886, J. Staley of the United Kingdom installed brakes on the bicycle, using roller bearings, forming a diamond-shaped frame with steel tubes and making the front and rear wheels the same size.
In 1888, J.B. Dunlop of the United Kingdom successfully applied pneumatic tires to bicycles, which significantly improved the riding performance of bicycles. Since then, the structure of the bicycle has been continuously improved, its performance has been gradually improved, and its use has become more and more widespread.
Components of a bicycle
The body part: including the frame, front fork, handlebar, saddle and front fork assembly, etc., is the main body of the bicycle.
Transmission part: including pedals, cranks, belts, pulleys, bottom axles and flywheels, etc. The pedals are stepped on by humans, and the wheels are driven to rotate through the above transmission parts to drive the car forward.
Action part: namely front and rear wheels, including front and rear axle components, spokes, rims (rims), tires, etc.
Safety devices: including brakes (brakes), lights, bells, reflection devices, etc.
According to needs, some accessories can be added, such as brackets, hangers, safety forks, mudguards, gas cylinders, etc. In addition, sports cars, racing cars, mountain bikes, etc. equipped with a transmission mechanism are also equipped with a transmission controller and front and rear derailleurs.