Chunfeng Lou's business is simply too good, so good that Li Xiang's surprise, a day's turnover is almost 500 yuan, so Chunfeng Lou will become the most profitable restaurant in Rongde County, of course, other restaurants also know who opened this Chunfeng Lou, but no one dares to do anything. Pen ~ fun ~ pavilion www.biquge.info

Li Xiang planned that after a friend, he could open the Chunfeng Building branch to Shaoxi Mansion, Chengdu Mansion and Chongqing Mansion, which was the big city, and the money would definitely be more than ten times more than that of Rongde County.

At the same time, Li Xiang has been thinking about the next plan, just like formulating a project, Li Xiang knows that preliminary analysis, feasibility analysis, risk assessment, difficult technology, cost, research cycle these things must be considered. Moreover, the project had to be representative, so Li Xiang's goal now was to build a bicycle first, and he decided to start with the mechanical part.

After a night of careful consideration, Li Xiang had already made a comprehensive consideration in his heart, and when he woke up this morning, Li Xiang went through the whole plan in his heart. To build a bicycle, there are several problems that must be solved:

Wheels can be made of solid wood planks, which is the simplest one, but because of the direction of the wood grain, it may lead to inconsistent strength of the wheels in all directions, and more importantly, this kind of wheels are too bulky, the bearings are not easy to install, and they are easily affected by crosswinds, so this scheme was quickly denied by Li Xiang. Later, after observing the wheels of the carriage, Li Xiang decided that the wheels were still made of wood-spoke wheels, which were evenly stressed in all directions around the circumference, and were strong and durable.

As for the transmission, these include a footrest, a transmission chain, a ratchet device for the rear wheels. Regarding the transmission chain, Li Xiang now has a variety of choices, but after a comprehensive comparison of a variety of schemes, he decided to choose a wooden chain, don't look at it is made of wood, Li Xiang learned through a simple calculation that there are mainly two kinds of parts on the chain, one is the chain piece, and the other is the pin that connects the chain.

The chain mainly bears tensile stress, and the pin bears shear stress, and the connection between the chain and the pin bears compressive stress, as well as a certain sliding friction, but the wooden chain and the iron pin can definitely meet the requirements. What's more, wood is easy to process, iron pins are not difficult to manufacture, and the strength is easily requirement.

Another problem is the ratchet device, that is, the one-way bearing, how to ensure that the chain can drive the rear wheel when pedaling forward, and after the chain stops driving, the rear wheel will not stop rotating. Li Xiang knows the ratchet device of modern bicycles, in fact, it is not complicated, the inner bearing, spring ring, ball, outer bearing, but the outer bearing has a one-way locking mechanism.

Don't look at this sounds simple, but in the Song Dynasty to process this set of bearings, not to mention whether the strength can be achieved, that is, the machining accuracy and technology are simply not guaranteed, at least for now.

Therefore, Li Xiang came up with a self-made ratchet device, which is actually very simple, that is, on the inner axis of the copper, along the direction of the single line, every 3o degree angle, a copper sheet is stretched out, and every 3o degree angle on the outer axis has a corresponding step, so that when it rotates, the copper sheet is just on these steps, and the outer shaft can be used to drive the inner shaft, and when reversed, the copper sheet will be bent and slipped, and there is no longer a transmission function between the inner and outer shafts. In this way, the problem of ratchet is also solved.

There is also the problem of bearings. But Li Xiang thought about it for a while, it is impossible to manufacture rolling bearings at present, although there have been some prototypes of rolling cylindrical bearings hundreds of years ago, but they are all flat supports, such as this kind of rolling bearing used on the armillary sphere, but to make a ring rolling bearing, because of the manufacturing process, the service life and bearing capacity are not as good as the sliding bearing, so he chose the easiest to make the sliding bearing. As for the lubrication problem, Li Xiang is not worried, because the bicycle itself does not have a large load capacity, and there is no problem with the carriage, let alone the bicycle.

There is also a brake problem, Li Xiang felt that it was impossible to use the rubber brake of later generations, and the hand brake was too troublesome to do, so he set up a handle under the seat, and then used the lever mechanism to rub the rear wheel brake. Although it is not very sightful to have your hand under the bottom when braking, it is better than nothing.

The bicycle in this ancient period, it must be able to become popular, because it is not only simple in structure, in addition to the convenience of riding, it can also carry goods, like the two or eight bars in the previous life, and can even pull two or three hundred pounds of goods, but now what is lacking is rubber tires and high-strength steel, fortunately, Li Xiang has a super 3D printer, only the coal and oil these two things can be mined out, you can print out rubber. As for high-strength steel, it can also be done in a super 3D printer, and all that is needed is ordinary iron.

Therefore, mining and iron works are also urgent things.

That morning, Cher boiled another bowl of sweet eight-treasure porridge.

Li Xiang said with a smile, what a girl, he was drinking porridge on the side, occasionally grinning and inhaling cool air, and constantly shouting "It's hot" in his mouth.

Xue'er and Yu'er both looked at Li Xiang in a daze, and Xue'er thought to herself: "He just called me a good girl, I don't know if he called me casually, or from his heart?" But seeing that he usually laughs and laughs, this time he must be talking nonsense again. ”

The more she thought about it, the more she figured it out in her heart, and she said softly: "Young Master, what did you call me just now?" Her voice was so small that she could barely hear herself.

Jumped up in shock at the moment: "What do you call me?" Xue'er was startled, she didn't expect Li Xiang to react like this. I didn't expect Li Xiang to react like this, and I thought too much in my heart for a while, and I couldn't help but be frightened.

Li Xiang felt that he was a little out of shape, coughed, cleared his throat, and said warmly: "This, Xue'er, the porridge you make now is so good, you deserve to be the shopkeeper!" ”

Xue'er grinned and said, "Then shouldn't the young master reward me with some more silver!" ”

Li Xiang smiled: "That's natural, now Xue'er is very good at making money!" ”

Guan Yu'er on the side was a little envious, Xue'er was able to help the young master do so many things, but in addition to being a female celebrity, writing and painting, she didn't even do housework as well as Xue'er.

At this moment, Li Xiang shouted: "Oops, I almost forgot about the big thing!" Yu'er, I want you to help me draw something." In fact, Li Xiang didn't really need Yu'er to draw, but was afraid that she would have low self-esteem, after all, Yu'er was a woman who had read books, and she was still a talented girl in Rongde County, but now she can only be a girl.

Although it can be printed, Li Xiang still thinks that more people need to learn how to draw, so Li Xiang asked Yu'er to draw and teach her.

Li Xiang explained his thoughts to Yu'er in detail at the moment, and simply drew some patterns, Yu'er Bingxue was smart and immediately understood what Li Xiang meant. (To be continued.) )