With the improvement of truck technology, more and more trucks are now equipped with turbochargers, but many turbochargers in the design life are damaged early. The reason is not the turbocharger itself, but the user. Caused by improper use of the operation. So what are the improper operations that can cause early turbocharger damage during use?
â— What is exhaust turbocharger
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At present, domestic trucks are generally equipped with exhaust gas turbocharger. Exhaust gas turbocharging is to increase the air intake of the engine by compressing air. The engine's exhaust inertial impulse is used to push the turbine in the turbine chamber. The exhaust turbine then drives the coaxial inlet impeller. The impeller pushes the air sent from the air cleaner pipe into the engine. Compressed into more air and oxygen in the same cylinder volume, thereby increasing the fuel combustion rate. Increasing the fuel volume accordingly increases the output power of the engine.
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However, exhaust gas turbocharger technology must also pay attention to it, that is, the pump wheel and the turbine are connected by a shaft, that is, the rotor, the exhaust gas emitted by the engine drives the pump wheel, the pump wheel drives the turbine to rotate, and the turbine rotates to the intake valve. The system is pressurized.
The supercharger is installed on the exhaust side of the engine, so the operating temperature of the supercharger is high, and the speed of the rotor during operation of the supercharger is very high, which can reach 7,000 to 100,000 revolutions per minute. Such a high speed and The temperature makes common mechanical needle rollers or ball bearings unable to work for the rotor, so turbochargers generally use fully floating bearings and are lubricated by oil.
â— Cold Throttle Throttle Turbine rotors are not lubricated to accelerate wear
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Because of the turbocharged operating characteristics, some bad driver habits can easily cause problems. For example, when the engine is left on the road, the supercharger rotor bearing is not sufficiently lubricated before high speed operation, resulting in early damage to the floating bearing of the rotor. With a large step on the big throttle, the bearing is accelerated due to lack of oil lubrication and even stuck.
â— Sudden flameout of hot car can also cause damage to floating bearings
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The working speed of the turbine rotor is as high as 70,000 revolutions per minute or even higher. After the engine shuts off, the lubrication system will stop working. However, the turbine rotor will not stop because the engine stops working. At this moment, the turbine rotor will continue to operate under inertia. The turbine chamber rotates at high speed. After long-term use, turbocharging will generate a lot of heat, even if the oil that is damaged in the booster will quickly vaporize or fail due to high temperature, and eventually form a carbon accelerating turbocharger.
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Because there is no lubrication system to continue to lubricate, the residual oil in the supercharger will not be able to lubricate the floating bearing, and in the past, the turbocharged floating bearing will be damaged prematurely.
â— Postscript
It is advisable that the card-driver of the booster model can idle the engine for two to three minutes while parking, so that the turbine rotor can be turned off after the speed is reduced to the normal speed in the case of organic oil lubrication. Do not worry too much after the cold start. Feet hit the throttle, allowing the turbine rotor to increase throttle after it is fully lubricated. In order to avoid premature damage to the supercharger, unnecessary economic loss
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