What is the wheel next to the engine?

[VanMalia]

There are generally five wheels on the belt of a car engine. They are the crankshaft pulley, water pump pulley, generator pulley, compressor pulley, and tensioner pulley. The functions of each wheel: Crankshaft pulley, the source of power, provides the rotation of the belt. Water pump pulley, achieves the circulation of cooling water inside the engine through rotation. Generator pulley, enables the generator to rotate and provides supplementary power to the vehicle through rotation. Compressor pulley, allows the compressor to work and supplies low-temperature refrigerant to the air conditioning system, reducing the temperature inside the car. Tensioner pulley, ensures the belt operates at the appropriate tension. The function of the timing belt: When the engine is running, the piston's stroke (up and down movement), the opening and closing of the valves (timing), and the ignition sequence (timing) must maintain "synchronous" operation under the "timing" connection.