Variable geometry turbocharger with high temperature insert in turbine throat
AssigneeAlliedSignal Inc.
InventorManfred Roessler
Life of this patent
Estimating the term…
Abstract
A turbocharger includes a turbine housing with a variable geometry mechanism which controls the flow area of the throat through which motive exhaust gasses are communicated to the turbine wheel. The turbine housing is provided with an insert which defines one wall of the throat and which is cast in place as part of the turbine housing. The insert may be made of a relative expensive, high nickel content material to assure that a non-corrosive surface is provided adjacent to the vanes which are pivotally actuated to vary the area of the throat. The remainder of the housing is made of a standard ductile iron which is substantially less expensive than the more expensive corrosive resistant high nickel content material from which the insert is manufactured.
Claims9
Turbocharger comprising a center housing, a compressor housing on one end of the center housing, a turbine housing on the other end of the center housing, a shaft rotatably mounted in said center housing, said shaft having a pair of ends, one end of the shaft extending into the compressor housing, a compressor wheel mounted on said one end of the shaft and within said compressor housing for rotation with the shaft, the other end of the shaft extending into the turbine housing, a turbine wheel mounted on said other end of the shaft within the turbine housing for rotation with the shaft, said turbine housing including a circumferentially extending volute for carrying motive gasses to said turbine wheel, said volute extending around said turbine wheel, a pair of walls extending circumferentially and spaced apart axially with respect to said shaft and defining a circumferentially extending throat for communicating the volute with the turbine wheel, a set of circumferentially spaced vanes within said throat and pivotally mounted on one of said walls for regulating flow of motive gasses into said turbine wheel, and a circumferentially extending insert carried by said turbine housing and having a portion defining the other wall, said insert being made of a material having enhanced corrosion resistant properties as compared to the material from which the turbine housing is made, said insert defining a circumferentially extending cavity within said insert, said cavity having an opening, said turbine housing extending through said opening into said cavity to thereby retain said insert on the turbine housing.
Dependencies are inferred from the claim text.