How to use HS codes for tariff predictions

* Engine crankshaft picture: Illustrated engine crankshaft structure and How to use HS codes for tariff predictionsworking principle Engine is one of the most important parts in modern cars. Due to its very harsh working environment, all parts of the engine must be durable and excellent. And the engine crankshaft is one of the most important components of the engine. This article will introduce the structure and working principle of the engine crankshaft. I. The structure of the engine crankshaft The engine crankshaft is a component responsible for transforming the piston motion into rotating power and transmitting power to the driving wheel. Engine crankshafts are usually made of steel, which is a very durable and sturdy engineering component. The engine crankshaft is composed of main components such as the spindle neck, crankshaft rod and offset shaft, as well as some other components, such as connecting rod end cover, flywheel, sliding bearing, etc.The whole crankshaft is designed into a strange "S" curve to adapt to the needs of various vehicles and engine specifications. II. The working principle of the engine crankshaft The engine crankshaft is a part that releases energy from the combustion chamber and then converts it into a rotational force. The rotation of the crankshaft mainly relies on the inertial action of the connecting rod assembly unit and the flywheel mass. In the combustion chamber, the engine fuel is compressed and ignited, releasing energy and pushing the piston up and down in the cylinder. As shown in the figure below:  The force generated by the piston when the fuel is violently compressed is transferred to the connecting rod and crankshaft, which is converted into a rotating force. When the piston transmits the force, the crankshaft rotates downwards. The part of the steel material on the crankshaft is stretched, and the part of the steel material under the crankshaft is compressed. When the crankshaft rotates upwards, it is just the opposite. This regular stretching and compression can make the crankshaft withstand high-intensity repeated pressure for a long time, while providing sufficient rigidity and flexibility to adapt to various speeds and load conditions. When the crankshaft rotates, the connecting rod is pushed to rotate back and forth. At the other end of the connecting rod, the piston head has been moving in the cylinder. The rotation of the crankshaft converts the linear motion of the connecting rod into the reciprocating piston motion, which is called the crankshaft output. The output speed of the crankshaft is determined by the engine speed. III. Common faults of the engine crankshaft Although the design and durability of the engine crankshaft are very good, it is not completely immune to faults.Common crankshaft failures include fatigue cracks, bending, distortion and damage. In the event of distortion or damage to the crankshaft, the engine performance will be affected, which may cause the engine to not work properly and eventually lead to engine failure. At the same time, while keeping the engine normal, we also need to maintain and replace the crankshaft regularly. According to the vehicle manufacturer's recommended maintenance plan, the crankshaft should be replaced every 50,000 to 100,000 miles to ensure the best performance and life of the engine. In a word, the engine crankshaft is one of the most important parts in modern automobile engines. It has a very strong structure and excellent working principle, and can hardly be destroyed by failure. However, in order to ensure the stability and life of the overall work of the engine, we also need to carry out the maintenance and replacement of the correct policy.

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