Overview of bicycles:
(English: bicycle), introduced to China from western countries, also called bicycle or bicycle, is usually a small land vehicle with two wheels. Nowadays, bicycles are all over the world and enter thousands of households. They are the most common means of transportation for people. After people get on the bus, they are green and environmentally friendly vehicles powered by pedaling.
In Japan, it is called "self-tuning"; In Chinese mainland, Hongkong, Macau, Taiwan Province Province and Singapore, it is usually called "bicycle" or "bicycle"; In Hong Kong and Macau, it is usually called "bicycle". It was first invented by German ranger delaisse (1785- 185 1). There are single bicycles and more than two bicycles.
It can be used as an environmentally friendly means of transportation and tourism; More and more people use bicycles as fitness equipment for riding and cycling. Cycling itself is also a competitive sport, including road cycling, mountain cycling, track cycling and acrobatic cycling.
Components:
1. Body part: including frame, front fork, handlebar, seat, front fork, etc. It is the main body of the bicycle. The transmission part includes pedal, crank, sprocket, chain, central shaft and flywheel. The pedal is stepped by manpower, and the wheel is driven to rotate and drive forward through the transmission parts.
2. Action part: front wheel and rear wheel, including front wheel and rear wheel axle, spokes, rims (rims), tires, etc.
3. Safety devices: including brakes (brakes), lights, bells, mirrors, etc.
Some accessories can be added as needed, such as brackets, clothes hangers, safety forks, fenders, air pumps, etc. In addition, sports cars, racing cars and mountain bikes equipped with speed change mechanisms are also equipped with speed change controllers and front and rear derailleurs.
Bicycle with dual power of hands and feet (3) 4. Composition of dual-power bicycle with hands and feet: A box made of alloy is added to the frame of the traditional self-study bicycle, which contains various transmission parts. Through the interaction of forces, the dual power of hands and feet and the simple action of pushing and pulling the handlebar are realized, so that the car moves forward with the handlebar, which is labor-saving and fitness-building.
Principle introduction:
Bicycle frame, tires, pedals, brakes, chains and other 25 components, the basic components are indispensable. Among them, the frame is the skeleton of the bicycle, which bears the largest weight of people and goods. According to the working characteristics of each component, it can be roughly divided into guiding system, driving system and braking system:
1. Guidance system: composed of handlebar, front fork, front axle and front wheel. The rider can change the driving direction and keep his body balanced by manipulating the handlebar.
2. Drive (transmission or walking) system: It consists of pedal, central shaft, toothed plate, crank, chain, flywheel, rear axle, rear wheel and other parts. The pedaling force of people's feet is driven by pedals through crank, sprocket, chain, flywheel, rear axle and other parts, thus making the bicycle move forward continuously.
3. Brake system: composed of brake parts, the cyclist can control the brake at any time to slow down and stop the running bicycle and ensure the driving safety.
In addition, for safety and beauty, as well as from a practical point of view, it is also equipped with lights, brackets and other components.