I make a popular science video and all the emperors learn from it!

【2. Modern means of transportation】

【2. Bicycle】

【Bicycle, also known as bicycle or bicycle, is usually a small two-wheeled land vehicle】

【After people ride on the bicycle, they use pedals as power, which is a green and environmentally friendly means of transportation.】

【There are many types of bicycles, including single bicycles, double bicycles and multi-person bicycles.】

【It can be used as an environmentally friendly means of transportation for transportation and travel.】

【More and more people use bicycles as fitness equipment for cycling exercises and bicycle outings.】

【Cycling itself is also a competitive sport, including road cycling, mountain bike racing, track cycling, stunt cycling, etc.】

【As of September 2023, the number of Huaxia bicycles in society will exceed 200 million】

【In 1866, the Qing Dynasty sent its first overseas inspection team. Among them, 19-year-old Zhang Deyi used the word"bicycle" in his travel notes.】

【So the word bicycle appeared for the first time and has been used ever since.】

【The bicycle is one of the most successful human-powered machines invented by mankind. It is a complex machine composed of many simple machines.】

【Design prototype:】

【In 1790, there was a Frenchman named Sifulak who loved to use his brain.】

【One day, he was walking on a street in Paris】

【Because it rained the day before, there was a lot of rainwater on the road, making it difficult to walk.】

【Suddenly, a four-wheeled carriage rolled up from behind. The street was relatively narrow and the carriage was very wide. Xifulak was able to hide and avoid being hit by the car, but he was still splashed with mud and rain.】

【Others saw it and felt sorry for him. They even cursed in anger and wanted to ask the carriage to stop and negotiate with him.】

【Sifulak murmured:"Stop shouting, stop shouting, let them go"】

【The carriage went far away, and he still stood blankly on the side of the road. He was thinking: The road is so narrow and there are so many pedestrians, why can't the structure of the carriage be changed?】

【The carriage should be cut in half along the way, so that the four wheels become two wheels at the front and rear.......】

【When he thought about it, he started designing it when he got home.】

【After repeated trials, the first"Trojan wheel" car for transportation was built in 1791.】

【This earliest bicycle was made of wood, and its structure was relatively simple, with neither a driving device nor a steering device.】

【The cyclist relies on his feet to push hard on the ground to move forward. When changing direction, he can only get off the car and move the bike.】

【Even so, when Sifulak rode this bicycle to the park for a ride, everyone present was quite surprised and admired】

【Improve:】

【In 1816, there was a forester named Drais in Germany.】

【Every day he walked from the woods in the east of the village to the woods in the west of the village, and he did this every year.】

【He thought: Wouldn't it be cool if a person sat in a car and walked and walked as he pleased?】

【Delais began to make a wooden wheel cart, which looked similar to the one made by Sifulak.】

【However, a direction control handle is added to the front wheel to change the direction of travel.】

【But when riding a bicycle, you still need to use two feet to push the ground step by step to push the bike forward.】

【When Delais went out on a bicycle to test, he was laughed at by many people along the way.】

【Despite this, he still likes this"cute pony bicycle" he created~ Zai"】

【Once, when Delais was riding a bicycle and strolling around, a carriage drove over. The coachman laughed at him and said that his car was slow, so he said to the coachman:"Do you believe that my car is faster than your carriage?" So the two of them said Made a bet】

【The journey was a round trip from the east to the west of the village. As a result, Dresley was more than an hour faster than the driver.】

【In 1840, Macmillan, a blacksmith in England, got a dilapidated"lovely pony"."】

【He installed a crank on the axle of the rear wheel, and then used a connecting rod to connect the crank to the front pedals. Both the front and rear wheels were made of iron, with the front wheel being larger and the rear wheel being smaller.】

【When the cyclist steps on the pedals, the bike will move on its own and run forward.】

【Caught by the police and fined】

【His crime is"riding wildly""】

【In 1861, Michaud and his son from France, who were originally carriage repairmen by profession, installed a rotating pedal board on the front wheel; the saddle of the car was placed on the front wheel, so that unless the rider was particularly skilled, Otherwise, you will not be able to hold the handlebars firmly and will fall off the car.】

【They gave this two-wheeled vehicle the elegant name"Bicycle" and exhibited it at the Paris Exposition in 1867, which was an eye-opener for the audience.】

【In 1869, after seeing French bicycles, Renault of France felt that the bicycles were too bulky.】

【He began to think about making the bicycle lighter. 】(To read exciting novels, go to Feilu Novel Network!)

【He used steel wire spokes to tighten the rims as wheels; at the same time, he used thin steel rods to make the frame. The front wheels of the car were larger and the rear wheels were smaller.】

【This reduces the weight of the bicycle itself】

【Starting from Shivlak and continuing to Renault, the five types of bicycles they produced are all very different from modern bicycles.】

【Modern prototype:】

【The true modern form of the bicycle was born in 1874】

【John K. Staley of China was a mechanical engineer】

【He designed a new bicycle style from the perspective of mechanics and kinematics, equipped the bicycle with a front fork and brake, the front and rear wheels were the same size to maintain balance, and made a diamond-shaped frame with steel pipes, which was used for the first time rubber wheels】

【Staley not only improved the structure of bicycles, but also modified many machine tools used to produce bicycle parts, opening up broad prospects for the mass production and popularization of bicycles. Therefore, he is called the"Father of Bicycles" by later generations."】

【The bicycle model designed by Staley is basically the same as the bicycle today.】

【Others later improved the tires】

【Turn rubber tires into inflated tires】

【This increases the elasticity of the bicycle and prevents it from vibrating due to uneven road surfaces; at the same time, it greatly increases the driving speed and increases the friction between the wheels and the road surface.】

【Later, the body was changed to a diamond frame structure, which gave the body higher rigidity and strength. The rear wheel was driven by a chain, and the direction was directly controlled through the front fork.】

【constitute:】

【Among the 25 components of a bicycle, including the frame, tires, pedals, brakes, and chains, the basic components are indispensable.】[]

【Among them, the frame is the skeleton of the bicycle, which bears the largest weight of people and cargo. According to the working characteristics of each component, it can be roughly divided into guiding system, driving system and braking system:

【1. Guidance system: It consists of handlebars, front forks, front axles, front wheels and other components. The rider can change the direction of travel and maintain balance by manipulating the handlebars】

【2. Drive (transmission or walking) system: consists of pedals, bottom bracket, crankset, crank, chain, flywheel, rear axle, rear wheel and other components. The pedaling force of human feet is transmitted by pedals through cranks, sprockets, chains, flywheels, rear axles and other components, thereby making the bicycle continue to move forward.】

【3. Braking system: It is composed of brake components. The rider can control the brake at any time to slow down and stop the moving bicycle to ensure driving safety.】

【In addition, for safety, beauty and practicality, (Deli Zhao) car lights, brackets, bells and other components are also assembled】

【...】

The ancients were astonished after reading it!

"｀Bicycle? It is an improvement from the horse-drawn carriage!"

"No, this thing has two wheels placed in a line. How can it run without falling over?"

"Compared with this, I am more curious that there are 200 million bicycles in China! How many people will there be in China in the future?! ?"

"It’s so shocking. Can we make this thing? Looks weird to order"

"..."

At the same time, emperors of various dynasties became more excited.

It is finally known that, except for very few model workers like Lao Zhu, most emperors had a lot of free time.

And very boring.

That's right, the bike looks really fun!.