Non-tariff barriers by HS code

The Non-tariff barriers by HS codedesign and working principle of traditional gasoline engine With industrial development and technological progress, automobiles have become an indispensable part of modern society. As the power source of automobiles, automobile engines are a crucial part of automobile production. Among them, the traditional gasoline engine is a type commonly used in automobile engines. So, what is the design and working principle of traditional gasoline engines? Traditional gasoline engineThe design usually includes major core parts: cylinder, piston, connecting rod, crankshaft, valve and air intake system, etc. Among them, the cylinder and the piston generally appear in pairs, and the part in the cylinder that coincides with the piston is called the cylinder liner. The gap between the inner wall of the cylinder liner and the piston should be appropriate, not too large or too small, so as to ensure that the piston can move freely in the cylinder. The piston is made of aluminum alloy or cast iron and other materials. It is generally elliptical and can move back and forth in the cylinder. The connecting rod is made of lightweight steel, with a piston at one end and a crankshaft at the other. The crankshaft is one of the most important parts of the whole engine, and its shape is similar to a semi-arc. When the piston moves up and down in the cylinder through the connecting rod, it is transformed into the rotational movement of the crankshaft through the change of the connecting rod and crankshaft. The air intake system includes air filter, throttle valve, inletA series of parts such as airways, intake pipes, intake manifolds, etc. aim to provide the engine with sufficient and clean air. The working principle of traditional gasoline engines can be briefly summarized as the four steps of "pump-pressure-combustion-exhaust". Specifically, when the crankshaft rotates for a week, each cylinder undergoes two complete cycles. In the first cycle, the intake valve will open and the piston in the cylinder will move down. In the process, the fuel and air mixture will be sucked into the cylinder. Next, the intake valve closed again, and the piston began to move upwards. At the same time, the spark plug at the top of the piston ignited the mixture of fuel and air. This kind of combustion produces energy, which pushes the piston down and converts it into the rotational energy of the crankshaft. In the second cycle, the crankshaft converts this rotation energy into the energy of compressed air, and then the exhaust gas of the cylinder is discharged to prepare for the next cycle.In addition to the above basic principles, traditional gasoline engines also include some other parts, such as ignition system, oil pump and cooling system. The ignition system can accurately control the ignition of the spark plug to ensure that the combustion occurs at the right time and in the right position; the oil pump provides fuel to the cylinder through the oil pipe. The cooling system can ensure that the engine is not damaged during high-temperature operation. In a word, the traditional gasoline engine is a classic and effective power source, which has been widely used. Through the introduction of its design and working principle, we can better understand the basic mechanism of cars, so as to provide more convenience for our daily travel.

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