TURBOCHARGER OF A VEHICLE FOR SHUTTING OFF AN OIL DRAIN PASSAGE LEAKING TO A COMPRESSOR INLET ACCORDING TO INTAKE NEGATIVE PRESSURE THROUGH A DRAIN HOLE OF A COMPRESSOR BACK PLATE

摘要

PURPOSE: A turbocharger of a vehicle is provided to prevent pollution of surrounding components and unnecessary combustion of oil by guiding oil into the normal drain passage instead of the intake system with the drain passage between a compressor back plate and a rotating shaft. CONSTITUTION: A compressor wheel(20) and a turbine wheel(22) are installed to both ends of a rotating shaft(18), and the rotating shaft is supported on a compressor back plate(12) by a first bushing member(24). A boss part(12a) is integrally formed in the compressor back plate in a turbocharger of a vehicle. Plural drain holes(12b) are formed in the circumference of the boss part of the compressor back plate. Oil supplied through an oil supply passage(14a) of a center housing(14) and an oil supply passage(30a) of a thrust bearing(30) is discharged through the drain holes of the boss part of the compressor back plate to the normal drain passage. Unnecessary consumption of oil is prevented by returning oil leaking according to intake negative pressure through the normal drain passage into the oil pan.