First of all, talk about the general structure principle of turbocharger, exhaust gas turbocharger mainly consists of pump wheels and turbines, of course, there are some other control components. The pump wheel and turbine are connected by a shaft, or rotor, and the exhaust gas from the engine drives the pump wheel, which turns the turbine, which then pressurizes the intake system. Turbocharger installed on the exhaust side of the engine, so the working temperature of the supercharger is very high, and the supercharger rotor speed at work is very high, can achieve the similar RPM, high rotation speed and temperature makes common mechanical needle or ball bearing cannot work for the rotor, so the whole floating bearing widely used turbocharger, the engine oil for lubrication, and cooling liquid cooling for the supercharger. Previously, turbochargers were mostly used in diesel engines, because gasoline and diesel burn in different ways, so the engine USES turbochargers in different forms.
This paper by guilin new ronghuang machinery co., LTD