Patent ID: 7360361
Filing Date: 2008-04-22
Classification: F01D,F02B,F05D,Y02T

Abstract:
1. A turbocharger comprising: a turbine within a turbine housing configured to be rotationally driven by exhaust gases produced by an internal combustion engine; a compressor within a compressor housing configured to be rotationally driven by said turbine to supply compressed air to an internal combustion engine; a turbo shaft oriented along a substantially vertical axis interconnecting said turbine and said compressor to provide said rotational drive to said compressor along said substantially vertical axis; an induction motor within a motor housing located between said turbine and compressor housings configured to have a motor rotor integral with said turbo shaft to provide controlled auxiliary rotational driving force to said shaft and said compressor; said motor housing includes upper and lower bearings for mounting said turbo shaft for axial rotation, said motor housing contains oil flow passages within said motor housing for allowing the flow of lubricating oil from an oil inlet to an oil outlet and to lubricate said upper and lower bearings; said motor housing also contains a motor cavity which provides for unobstructed rotation of said motor rotor; said motor housing and said compressor housing further include an air scavenging passage between said compressor and said motor cavity to provide relatively cooled air scavenged under pressure from said compressor to ventilate said motor cavity; said motor housing further contains an oil sump adjacent said lower bearing; said oil flow passages are in communication with said oil sump and said sump is in communication with said oil outlet; and said motor housing contains a first outlet air passage in communication between said motor cavity and said oil sump to allow said scavenged air to escape said motor cavity and assist the removal of oil collected in said oil sump to said oil outlet.