Patent ID: 6530754
Filing Date: 2003-03-11
Classification: F04D,F16C

Abstract:
An exhaust gas turbocharger for an internal combustion engine, comprising: a turbine with a turbine wheel, a compressor with an impeller, a shaft extending between and supporting said turbine wheel and said impeller, said shaft being rotatably supported by friction bearings, oil supply means for supplying lubricating oil to said bearings, and a speed detection device for detecting the rotational speed of said turbine wheel and said impeller, said speed detection device including a pressure modulation structure provided on said shaft for modulating the pressure of the lubricating oil in said oil supply means in correlation with the rotational speed of said turbine and said impeller, and an oil pressure sensor arranged in said oil supply means for sensing the oil pressure modulation for determining the speed of said turbine and said impeller.