The oil inlet pipe of the oil cooler is the pipe used to direct hot oil from the engine oil sump to the cooler for cooling. It works as follows:

1. Directing hot oil: The oil cooler is usually located in the engine cooling system and is used to reduce the temperature of the oil. The function of the inlet pipe is to direct the hot oil from the engine sump to the cooler for cooling process. After the hot oil passes through the cooler, its temperature will be reduced, thus improving the thermal stability and performance of the oil.

2. Oil inlet pipe connection: The oil inlet pipe of the oil cooler connects the outlet of the engine oil sump to the inlet of the cooler. Hot oil flows from the engine oil pan to the cooler through the inlet pipe.

3. Oil Pump Drive: The oil inlet line is usually dependent on the oil pump inside the engine. The oil pump is responsible for pumping oil from the oil pan to the oil inlet tube to keep the oil circulating and available. The pressure generated by the oil pump pushes the hot oil into the oil inlet tube, allowing it to flow to the cooler.

4. Oil Passage Design: The design of the oil inlet tube usually takes into account the flow and resistance of the oil. Reasonable oil channel design can minimize the resistance and pressure loss in the process of oil inlet flow to ensure the efficiency and stability of oil inlet flow.

The oil inlet pipe of the oil cooler is driven by the oil pump to direct the hot oil from the engine oil sump to the cooler for cooling. It plays a key role in the engine cooling system, ensuring the cooling and circulation of the oil and maintaining the normal operation and life of the engine.