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Why does the automobile flywheel always exist in the engine structure, does the technology really not improve?

Update:11 Jan 2020
Summary:

In fact, sometimes when we see some tractors, or some d […]

In fact, sometimes when we see some tractors, or some diesel engine cars, we always see that there is a very large flywheel in our car engine. Basically, if we go to see some old cars, there are also big flywheels. So sometimes we can't help but think, does our car engine technology really not make great progress? After all, new engines are emerging, but in fact, if you look at some new engines, you will feel that their flywheels are not very small compared to the entire engine. What is the reason for this phenomenon?

Why does the automobile flywheel always exist in the engine structure, does the technology really not improve?

In fact, sometimes we can see this structure, which is very common on some single-cylinder diesel engines. In the past, we can see that some tractors have single-cylinder engines with more than 42 horsepower or 45 horsepower. There will always be such large wheels. Then drive the entire transmission. But I learned how to build a car in college. When he disassembled and assembled the engine, he also saw the diesel flywheel we had disassembled at the time. It is also very large, and when we pick it up, we also feel that the flywheel is quite heavy. Although we had guessed some diesel engines at the time, in fact this model is closer to the current diesel engine, so what effect does this flywheel have on such engines?

In fact, the function of this flywheel is to transfer the power of our engine through the flywheel and the conveyor belt to traditionally drive the entire car. Then the size of the flywheel must be larger than the size of the gear on our drive shaft, otherwise the power of the transmission will be guaranteed . It is probably not enough. So this also explains that although our engine technology is constantly improving, the size of the flywheel is basically a relatively large state. So it is not that our technology has not improved, but that some of our things have improved, but that the basic principles of our automotive transmission have not changed, so it is impossible to cancel the structure of the large flywheel.

And basically speaking, although many friends do n’t care much about this kind of thing, and now the flywheel is indeed reduced to a certain extent, in fact, the reduction is also calculated carefully. So this kind of structure also has meaning. Don't consider him as a useless facility.