As we know a lot of improvements have been made to engines, the efficiency of engines is still not high in the process of converting chemical energy into mechanical energy. Most of the energy in gasoline (about 70%) is converted into heat, and dissipating this heat is the task of the car’s cooling system. In fact, a car driving on a highway, the heat lost by its cooling system is enough to heat two ordinary houses! If the engine becomes cold, it will accelerate the wear of components, thereby reducing the efficiency of the engine and emitting more pollutants.
Therefore, another important function of the cooling system is to warm up the engine as quickly as possible and keep it at a constant temperature. The fuel burns continuously in the car engine. Most of the heat generated in the combustion process is discharged from the exhaust system, but some of the heat remains in the engine, causing it to heat up. When the temperature of the coolant is about 93°C, the engine reaches its best operating condition.
The function of the oil cooler is to cool the lubricating oil and keep the oil temperature within the normal working range. In the high-power enhanced engine, due to the large heat load, an oil cooler must be installed. When the engine is running, the viscosity of the oil becomes thinner with the increase in temperature, which reduces the lubricating ability. Therefore, some engines are equipped with an oil cooler, whose function is to reduce the temperature of the oil and maintain a certain viscosity of the lubricating oil. The oil cooler is arranged in the circulating oil circuit of the lubrication system.
Types of oil coolers:
1) Air-cooled oil cooler
The core of the air-cooled oil cooler is composed of many cooling tubes and cooling plates. When the car is running, the oncoming wind of the car is used to cool the hot oil cooler core. Air-cooled oil coolers require good surrounding ventilation. It is difficult to ensure sufficient ventilation space on ordinary cars, and they are generally rarely used. This type of cooler is mostly used in racing cars because of the high speed of the racing car and the large cooling air volume.
2) Water-cooled oil cooler
The oil cooler is placed in the cooling water circuit, and the temperature of the cooling water is used to control the temperature of the lubricating oil. When the temperature of the lubricating oil is high, the temperature of the lubricating oil is reduced by the cooling water. When the engine is started, the heat is absorbed from the cooling water to make the lubricating oil temperature rise rapidly. The oil cooler is composed of a shell made of aluminum alloy, a front cover, a rear cover and a copper core tube. In order to enhance cooling, heat sinks are fitted outside the tube. Cooling water flows outside the tube, and lubricating oil flows inside the tube, and the two exchange heat. There are also structures in which oil flows outside the pipe and water flows inside the pipe.
Post time: Oct-19-2021