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Air-cooled engine is HS code filtering for restricted itemsa relatively new engine category. Compared with the mainstream water-cooled engine on the market, it has a more simpler structure, more efficient heat dissipation ability, and more convenient maintenance and repair. This article will focus on the working principle of air-cooled engine and its practical application. I. Working principle of air-cooled engine Air-cooled engine is an engine that uses natural wind or mechanical wind to dissipate heat. Unlike water-cooled engines, air-cooled engines do not have water pumps, water tanks, water pipes and other accessories, and their heat dissipation is carried out on the heat dissipation surface through airflow. The air-cooled engine is mainly composed of the following parts: 1.Cylinder: The cylinder of the air-cooled engine is relatively thick to ensure that the heat dissipation surface can withstand high temperature and high pressure. At the same time, less weight is also an advantage of the air-cooled engine. Two. Heat dissipation fins: On the surface of the cylinder, there are countless heat dissipation fins covered. When the engine rotates, these fins can fully dissipate heat. Usually, the fin is divided into two parts: one part is fixed on the cylinder, called the fixed fin; the other part is directly sucked and cooled by an electric fan, called the moving fin. 3. Cooling fan: When the air-cooled engine starts, the cooling fan begins to rotate to achieve the heat dissipation effect by flexibly rotating and adjusting the natural airflow and axial airflow (generated by fan blades). Four. Heat dissipation cover: The heat dissipation cover plays a very important role in air-cooled engines, that is, protecting the heat dissipation fins. At the same time, the heat sink is designed very cleverly, which can fully guide the airflow and prevent overheating.II. Practical application of air-cooled engine 1. Motor vehicle air-cooled engines are more and more widely used in automobiles, motorcycles and other vehicles due to their simple structure, good heat dissipation effect, convenient maintenance and lower cost. For motorcycles, the advantages of air-cooled engines are more obvious. Traditional water-cooled engines generally have heat dissipation problems and water leakage problems, while air-cooled engines do not have these problems. At the same time, a large amount of airflow will be generated during the motorcycle movement, which can further enhance the heat dissipation effect of the air-cooled engine. Two. The high efficiency and super power output capacity of aircraft air-cooled engines are widely used in aircraft. Compared with water-cooled engines, air-cooled engines are lighter, can withstand high temperature and high pressure, and can operate normally in high-altitude environments. It is also more suitable for differentTypes of aircraft, including helicopters, airplanes, unmanned vehicles, etc., are widely used in various equipment in the sky. 3. Power mechanical air-cooled engines are also widely used in the field of power machinery. As a power source, using an air-cooled engine can bring less weight and less maintenance than a water-cooled engine. An example of the application of air-cooled engines in high-efficiency and high-performance power machinery is a high-performance motor, in which air radiators are used to reduce heat and improve efficiency. IV. Summary Air-cooled engine is an excellent type of engine, which is widely used in automobiles, motorcycles, aircraft, sports equipment and various power machinery and other fields. Due to its excellent heat dissipation effect, simple structure and low maintenance cost, it is believed that air-cooled engines will be more widely used in various fields in the future and become an important source of energy.

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