What are the advantages and disadvantages of timing belt and timing chain?

What are the advantages and disadvantages of timing belt and timing chain? What are the advantages and disadvantages of timing belt and timing chain? Timing system is an important part of the engine valve train and one of the important factors to ensure the stable breathing of the engine. The main working process is: the crankshaft drives the camshaft to run through the chain or belt, and the rotation of the cam working surface presses the valve tappet, thus pushing the valve to move into the cylinder and opening the valve; After the cam working surface rotates, the valve will be reset under the action of the valve spring, which will close the valve. The advantages of synchronous belt drive mode are mainly low cost, low noise, simple structure and light weight, but the disadvantages are also obvious, that is, poor reliability, which requires regular inspection and replacement. The safe service life of most models is 60,000 kilometers. The advantages of camshaft driven by timing chain are more accurate valve timing, not easy to break, high reliability and more stable operation at high speed. The disadvantages are high noise, complex structure, heavy weight and high price, but these disadvantages can be obviously improved by process optimization and hydraulic tensioning mechanism. Now some cars use toothed silent chains, and its noise is even lower than that of synchronous belts. It is believed that the widespread use of this timing chain will bring more convenience to the majority of automobile users. Synchronous belt has low noise, mature technology and low cost, but it needs regular inspection and maintenance. Timing chain has compact structure, high transmission power, high wear resistance and lifetime maintenance-free, but it is generally louder than timing belt. Synchronous belt has low noise, mature technology and low cost, but it needs regular inspection and maintenance. Timing chain has compact structure, high transmission power, high wear resistance and lifetime maintenance-free, but it is generally louder than timing belt. Timing belt and timing chain, I believe friends who have cars know very well, their functions are the same, that is, when our engine is intake and exhaust, the camshaft and crankshaft of our engine move synchronously. Of course, the most obvious difference between the two is the difference in materials. Let me talk about their advantages and disadvantages. First of all, the timing belt is made of rubber, and its transmission inertia and transmission assistance are relatively small, which can increase the power of the engine, but it also has a disadvantage that it must be replaced preventively, that is to say, the timing belt should be replaced in time when it reaches a certain kilometer. Some people may say, my timing belt looks quite new, why should I change it? But I want to tell you that you may see that the appearance is relatively new and there will be drawbeads inside. If the drawbead is broken, the whole engine will be destroyed at the back, so whether it is new or old, it should be operated according to the kilometers stated in the manual. Next, let's talk about the timing chain. Its advantages and disadvantages are simply that it can be adjusted by the timing belt. Because it is made of iron or metal, its transmission resistance and transmission inertia are relatively large, and the noise of iron-iron friction is also relatively large. Relatively speaking, the power of our engine will be slightly lost, but it also has the advantage that there is no need for preventive replacement, unless, of course, your engine is really abnormal when it is used. Anyway, at present, the timing chain will be more and more widely used, because the efficiency of our engine is already very high and NVH is also very good, so the noise control is very good, mainly to save money, and there is no need for preventive replacement, which saves many car owners the mind of maintaining their cars, so most engines on the market will use the timing chain. @20 19