HS code utilization in digital trade documents

The HS code utilization in digital trade documentsengine is the core component of modern internal combustion engine vehicles. It drives the vehicle forward by burning fuel into energy. The structure of the engine is very complex, and it requires the joint action of multiple parts to achieve efficient energy conversion and effective work. I. Engine structure The engine mainly includes the following parts: 1. Cylinder block: the main part of the engine, usually made of cast iron or aluminum alloy. There are several cylinders inside, and a piston is placed in each cylinder. Two. Piston: Made of forged aluminum alloy or cast aluminum alloy, the piston converts linear motion into rotational motion by converting the energy of compressed air and fuel. 3. Piston ring: a ring-shaped part installed on the piston, usually made of chrome steel.Their function is to seal the combustion chamber as much as possible, prevent the leakage of the mixed gas, and ensure that the lubricating oil does not enter the combustion chamber. Four. Piston pin: a component that connects the piston to the connecting rod, usually made of high-strength steel. 5. Connecting rod: a component that connects the piston and crankshaft of the engine, usually cast steel or forged steel. It transforms the linear motion of the piston into the rotational motion of the crankshaft. 6. Crankshaft: It is mainly used to convert the up and down motion of the piston into a rotating motion, usually made of forged steel. 7. VALVE: CONTROL THE INLET AND OUT OF MIXTURE AND EXCAUST GAS BY OPENING AND CLOSING THE INLET AND OUTLET OF THE ENGINE CYLINDER. It is usually divided into two types: intake valve and exhaust valve. Eight. Camshaft: It is a shaft driven by a connecting rod pulley, which pushes the valve at different positions and angles. The rise of the piston and the rotation of the crankshaft are formed by enlarging the groove on the camshaft.Nine. Coordinate axis: used to measure the piston movement in each cylinder to ensure that all cylinders work the same. 10. Fuel system: usually includes fuel pump, fuel injector and fuel storage tank. After passing through the oil pump, the fuel is sprayed into the combustion chamber in the cylinder, and then ignited and burned to produce energy. 11. Ignition system: mainly includes spark plugs, ignition coils and distributors. Spark plugs ignite the gas in the fuel mixture through discharge, thus achieving combustion and energy conversion. The ignition system is usually powered by the electrical system of the vehicle. II. Working principle of the engine When the engine is started, after the fuel and air are mixed, it enters the cylinder through the intake valve. The crankshaft rotates and drives the piston to move up or down. At this time, the ignition system needs to cause electric sparks from the spark plug, causing a combustion reaction. Produced by the combustion processHigh-temperature and high-pressure gas drives the piston, so that the crankshaft can convert the linear motion of the piston into rotational motion, thus driving the wheels forward. Open the exhaust valve to discharge the exhaust gas and start the next cycle. III. Engine classification Engines can be divided into two types according to the combustion mode: gasoline engine and diesel engine. 1. Gasoline engine: The mixed gas is ignited through the ignition system to generate energy, with stable output power, low noise, light weight, small size and other advantages. It is suitable for light passenger cars. Two. Diesel engine: The diesel engine uses high-pressure fuel injection to heat and compress the diesel, and spontaneously ignites in the cylinder to produce high-temperature and high-pressure gas to generate power. It has a large output power and high fuel utilization rate, but it is noisy and vibrational, which is mainly suitable for heavy transport vehicles. IV. Conclusion The engine is one of the core components of modern vehicles, and it is the key to efficient energy conversion.The structure of the engine is complex and requires the synergy of multiple components to achieve efficient energy conversion and effective work. Therefore, when maintaining and maintaining the engine, it is necessary to carefully maintain each part to ensure the normal operation of the engine to ensure the safe and efficient operation of the vehicle.

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