HS code-based negotiation with suppliers

* Engine Collection (Engine Knowledge Sorting: A comprehensive engine guide) The HS code-based negotiation with suppliersengine is the core component of the automobile and is also widely used in other machinery and equipment. It is an important component that converts chemical energy into mechanical energy. Therefore, it is essential for students studying automobiles or other mechanical disciplines to have an in-depth understanding of the structure and working principle of the engine. This article will introduce in detail the different types of engines, their structure and working principle, and other knowledge related to the engine. I. Engine type 1. Internal combustion engine Internal combustion engine is an engine that ignites fuel after mixing fuel and air to generate heat energy and convert it into mechanical energy. Internal combustion engines include gasoline engines and diesel engines. Two. External combustion engine The external combustion engine mixes the fuel with oxygen before it burns. Since the external combustion engine does not involve direct ignition of fuel, it is safer than the internal combustion engine.3. Steam engine Steam engine uses water vapor as energy, which was often used in load-bearing mechanisms such as mobile machines or trains in the past. However, with the popularity of other energy sources such as electricity, most of the current cars no longer use steam engines, but internal combustion engines. II. Engine structure The structure of the automobile engine includes the engine body, crankshaft, connecting rod, valve/balge seat, cylinder block and cylinder head, etc. 1. The crankshaft of the crankshaft automobile engine is generally cast in steel or carbon steel, and the number of crankshafts is directly proportional to the amount of gas that bursts out. Under normal circumstances, the crankshafts of a gasoline engine usually have four, and the diesel engine has six. Similarly, the crankshaft is also equipped with the Crankshaft Position Sensor, which is a major element of the engine control system. Two. The connecting rod connects the piston and the crankshaft.In a gasoline engine, the connecting rod has less resistance, so the piston is lighter than the diesel engine. 3. The valve and the valve seat are important parts of the engine, adjusting the intake and exhaust. The valve seat is usually a mechanical part used to establish airtightness. Four. Cylinder block and cylinder head The cylinder block and cylinder head of an automobile engine are separate parts, which wrap the crankshaft, piston and connecting rod together. The cylinder block is a part with holes, and its angle and shape directly affect the efficiency of the engine. III. Working principle of the engine The internal combustion engine of a car is composed of piston, crankshaft, connecting rod and other components. When the engine is running, the intake valve (in gasoline engines) or the intake pipe (in diesel engines) sucks air into the cylinder, while the remaining exhaust gas is discharged in the exhaust valve or exhaust pipe. In the combustion chamber, the mixture of gasoline and air is ignited by spark plugs, resulting in high-temperature and high-pressure gas.These gases will drive the piston to move down, and then transmit power to the rotor and tires through the crankshaft to make the car move forward. In a diesel engine, the air is compressed to a very high temperature, and then the diesel is sprayed into it to ignite the fuel, which is similar to a gasoline engine, thus promoting the piston movement and allowing the car to drive. IV. Other engine knowledge 1. Lubrication system The lubrication system helps to provide lubrication and cooling functions for the starting mechanism parts. It is circulated by hydraulic oil on the parts that need lubrication, thus reducing the friction and wear of the parts. Two. Cooling system Cooling system is another important function in automobiles. It uses water to lower the engine temperature. The working principle of this system is similar to that of the lubrication system. 3. Electrical system The electrical system of a car is composed of batteries, starters, generators, electric motors and other devices. The function of the whole system is to provide energy during the start-up of the car.In summary, the engine provides an important power source for the car, and it is very important for drivers and maintenance personnel to understand the structure and working principle of the engine. In addition, other engine knowledge such as lubrication system, cooling system and electrical system is also necessary.

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