Patent ID: 7367190
Filing Date: 2008-05-06
Classification: F01D,F02B,F02C,F05D,H02K,Y02T

Abstract:
1. A supercharger with an electric motor comprising: (a) a turbine impeller rotationally driven by an exhaust gas of an internal combustion engine; (b) a turbine housing surrounding the turbine impeller; (c) a compressor impeller coupled to the turbine impeller by a shaft and rotating so as to compress an intake air; (d) compressor housing surrounding the compressor impeller; (e) an electric motor positioned between the turbine impeller and the compressor impeller so as to rotationally drive the shaft; (f) a center housing rotatably supporting the shaft and having the electric motor built-in, wherein the center housing comprises (g) a scroll chamber annularly formed within the compressor housing and discharging a compressed air; and (h) a diffuser portion extending to an outer side in a radial direction from an outlet of the compressor impeller and communicating the outlet of the compressor impeller and the scroll chamber, wherein the electric motor is arranged at a position adjacent to the compressor impeller and the cooling fluid flow path is formed so as to be adjacent to the diffuser portion, wherein the cooling fluid flow path circulates cooling fluid in an inner portion of the center housing and the first cooling structure portion is disposed at a position on an electric motor side of the cooling fluid flow path so as to cool the electric motor by heat transfer, and the second cooling structure portion is disposed at a position on a diffuser portion side of the cooling fluid flow path so as to cool the diffuser portion by heat transfer.