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Design and UEFA TVapplication of small engine With the improvement of the quality of life and the economic level, more and more people are beginning to pay attention to the use of portable electronic equipment and personal means of transportation. As a key driving force, small engines have received more and more attention. Small engines were originally used as a driving force for model aircraft and cars, but now more and more small engines are used to power personal vehicles (such as scooters, motorcycles and light aircraft) and portable electrical equipment (such as generators and pumps).This article will discuss in depth the design principle and application field of small engines. Compared with the design principle of a large engine, the design requirements of a small engine are higher, because it must complete the same power output in a relatively small space. Therefore, small engines need a more compact and accurate structure. Usually, small engines include pistons, connecting rods, crankshafts and valve systems. The piston is one of the most important parts in a small engine. It is characterized by the same shape as a hydraulic cylinder, which can move up and down in the cylinder block of the engine. The connecting rod connects the piston and the crankshaft, which transmits the kinetic energy of the piston's up and down movement to the crankshaft when the engine rotates. The crankshaft is the main rotating part of a small engine. It converts the round-trip movement of the piston into rotational motion and controls the operating speed of the small engine.The valve system usually includes the intake valve, the exhaust valve and the camshaft, which are used to control the flow of air and fuel and achieve the emptying of the engine cylinder. There are other factors to consider in the design of small engines. For example, in order to save space, complex cooling systems and oil lubrication systems are often required. In addition, it is necessary to consider the quality and durability of small engines, because it plays a crucial role in reducing failures and improving efficiency. The application direction of small engines in the field of application is very wide, from model aircraft and automobiles to personal vehicles and portable power equipment, all involving small engines. The following is a brief introduction to several common applications. 1. Model airplanes and cars. Small engines were originally designed for model aircraft and cars, which usually operate in oil fields and in the air and require very high power output ratios and precision.Two. Personal means of transportation. Small engines are widely used in the driving force of small personal vehicles (such as scooters, unicycles, motorcycles and light aircraft). In these applications, small engines usually need to be efficient, portable and low-noise. 3. Portable power equipment. Small engines can be used as the power of portable generators or pumps. In these applications, small engines usually require high output power and long working life. To sum up, small engines have been applied in more and more fields, and their design and development are becoming more and more important. Especially in the field of personal transportation and portable power equipment, the use of small engines is more common. In the future, the design and technology of small engines will continue to be improved to meet people's demand for more efficient, portable and environmentally friendly power.

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