Vented turbocharger center housing and method

摘要

A turbocharger (300) for an internal combustion engine (500) includes a center housing (304) connected to a turbine housing (302) and a compressor housing (306). A shaft (318) is in a bore (314) of the center housing (304). An oil supply passage (328) is in fluid communication with the bore (314). An oil drain passage (310) is in fluid communication with a oil cavity (334) and the bore (314). A vent passage (330) is in fluid communication with the oil cavity (334) and an internal volume (520) of the internal combustion engine (500). Oil flow passes through the first passage (328) and the drain passage (310) during operation of the internal combustion engine (500). A first pressure of air (P1) in the oil cavity (334) is about equal to a second pressure of air (P2) in the internal volume (520) of the internal combustion engine (500).