Otaku Engineer in Great Tang Dynasty

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In fact, this bicycle is really not easy to ride, it is not as good as a modern little yellow car!

Since the pedals of this car are directly placed on the axis of the front wheel, the power of the car is mainly transmitted through the crank rocker linked with the pedals. When the pedals rotate once, the front wheel also rotates once. In this case, it is too difficult to make the car go faster!

If it weren't for Li Zexuan's martial arts skills, it is estimated that he would have been exhausted just riding from Yunshan to Chang'an. Where would he have the energy to carry Laner around?

Since the body of a modern bicycle is driven by a chain, there will be a large transmission ratio between the front and rear gears. Under normal circumstances, one rotation of the pedal will drive the rear wheel to rotate several times. The so-called variable speed bicycle is in the rear wheel. A flywheel is added to the place, that is, a gear that can change the number of teeth.

y represents the gear ratio, c represents the number of teeth of the driving gear, and n represents the number of teeth of the passive gear. The relationship between them is expressed by a formula, that is, y=c/n. Substitute into the formula to obtain a gear ratio of 3. That is to say, pedaling the roulette for one week, the flywheel rotates three times, that is, the rear wheel rotates three times.

Although it is said that increasing the gear ratio can speed up the speed of the bicycle, it should not be ignored. The chain drive in this case is a laborious lever. The larger the gear ratio, the more laborious the pedaling will be. For the models on the side, the gear ratios are about 2-4.

The gear ratio adjustment of the variable speed car relies on changing the gear ratio to adjust the transmission ratio, so as to achieve the purpose of saving effort or increasing speed.

Another problem is the rotating parts of various parts of the bicycle body. What the workshop can do now is only roller bearings, and ball bearings can't be done. The rollers also caused the bicycle in Li Zexuan's hand to run jerky, the handlebars were inflexible to rotate, and the frictional kinetic energy of the wheels was lost. This makes this thing more strenuous to ride.

"Brother! Look! Look! Isn't that elder sister Changle and elder brother Crown Prince?"

When riding to Dongshikou, Laner suddenly screamed excitedly.

"Hey~!"

Hearing Laner's voice, Li Zexuan quickly squeezed the brakes, a hoarse rubbing sound resounded on the street, and the bicycle stopped immediately.

"Ouch~!"

Due to inertia, Lan'er's head hit Li Zexuan's back all of a sudden, and the little girl couldn't help but let out an exclamation.

"Chengqian? Where is it?"

Li Zexuan supported the bicycle with his right foot, turned his head and asked.

"Humph! Brother stinky, don't tell Laner when you stop!"

Laner rubbed her head and said with a small mouth.

Of course, the little girl is definitely not really angry. After she complained about Li Zexuan, she said: "Nuo, that's not the prince and... Hey! Brother, they are coming to us!"

In fact, without her having to say, Li Zexuan had already found Li Chengqian and Changle in the crowd. The two brothers and sisters were followed by two guards, and the guards were holding several brocade boxes in their hands, presumably they were going out of the palace to go shopping and just finished shopping.

The previous hoarse braking sound instantly attracted the attention of their siblings, and when they saw Li Zexuan and Laner here, they leaned over here.

"Yeah! Brother Xiaoxuan! What kind of car are you pushing~?"

Chang Le trotted all the way, looked at the bicycle beside Li Zexuan with surprise, and said.

"Yes! Xiaoxuan! Why have I never seen such a car before?"

Li Chengqian also walked to Li Zexuan's side at this time. Seeing Lan'er sitting in the strangely shaped car, he felt a burst of surprise in his heart and couldn't help asking.

"Brother Prince is so stupid! This car is called a bicycle. It can run on its own, and it runs very fast!"

Seeing that Li Chengqian and Chang Le both looked like they had never seen the world before, Lan Er suddenly felt a deep sense of superiority, and she couldn't help but said: "A-niang said earlier that brother Prince and Sister Chang Le were from the royal family and had noble status, but now I see Come on, the royal family is better than our family!"

The little girl's thoughts are always so simple and naive. She has bicycles in her family, but the royal family does not. Obviously, her family is better than the royal family!

"Hehe! That's right! This is the bicycle! The workshop just made it, Chengqian, you have never seen it before!"

Li Zexuan held the bicycle with one hand and patted Laner's head with the other.

"Bicycle? Can this bike really walk on its own?"

Li Chengqian looked at the bicycle earnestly, a little disbelieving.

He always felt that this kind of car would fall to the ground as soon as people let go, how could it be possible to walk on its own?

In fact, it's not that he is short-sighted. The main reason is that ancient people often saw carriages, and a mindset has been formed. Bicycles only have two wheels, and the two wheels are arranged in tandem. Naturally, it is far inferior to the appearance of a carriage. more stable.

Before Li Zexuan could speak, Lan'er couldn't help but retort: ​​"Why can't you! Lan'er and her brother just rode this car here!"

Chang Le covered his mouth with a smile and said, "Sister Lan'er, it should be the car that brother Xiaoxuan is riding. Are you in the car?"

Lan'er's face was not blushing and her heart was not beating, and she said, "Mmmm! They just want to express this, Sister Changle, you are so understanding!"

This girl's sweet mouth can make people tired, and Chang Le is overjoyed by the sweetness, "Hehe! Laner, how does it feel to sit on this bicycle?"

Laner raised her head,

After thinking for a while, he said, "Yeah! It's quite comfortable... It's just a little cold!"

To be fair, a bicycle is indeed faster than a horse-drawn carriage, but this thing is definitely not as warm as a horse-drawn carriage.

This kind of cute and smart answer immediately made everyone laugh.

"Sister Changle, would you like to come and try it? It's really comfortable~?"

Laner saw that everyone was laughing, and thought they didn't believe what she said, so she said again.

A hint of emotion flashed in Chang Le's eyes immediately, Li Chengqian glanced at Chang Le inadvertently, his heart suddenly thumped, and he hurriedly said: "Cough! I haven't seen you for a long time, so I should be anxious!"

As the elder brother, Li Chengqian has actually discovered that Changle's feelings for Li Zexuan are not the same. He can't tell whether it is the attachment to the elder brother, or the relationship between men and women, but no matter what, Changle should not go with Li Zexuan. too close. As for the matter of sharing a car, it is even more impossible!

"... um~! Then... brother Xiaoxuan, sister Lan'er, goodbye~!"

Chang Le shook his thin lips and said softly.

In a pink palace dress, she looked even more pitiful in the sunset.

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