Blade Mounting Ring For A Turbocharger On An Internal Combustion Engine

Abstract

The invention relates to a blade mounting ring for a turbocharger with variable turbine geometry and turbine blades which may be adjusted in the blade mounting ring on an internal combustion engine for a motor vehicle, comprising an austenitic iron matrix alloy with a sulphur component to achieve a solid lubrication effect on the bearing surfaces thereof with a material embodiment suitable for high performance engines. The above is achieved by means of a blade mounting ring with a proportion of 1 to 6 wt. % of an alloying element or several of the elements from tungsten (W), cobalt (Co), niobium (Nb), rhenium (Re), molybdenum (Mo), tantalum (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr) or similar.

1 . A blade mounting ring of a turbocharger having a variable turbine geometry and turbine blades adjustable in the blade mounting ring on an internal combustion engine, made of an austenitic iron matrix alloy
 having a sulfur content sufficient to achieve a solid lubricant effect on its bearing surfaces, and   having an amount of 1 to 6 wt % of one or more of the alloy elements tungsten (W), cobalt (Co), niobium (Nb), rhenium (Re), molybdenum (Mo), tantalum (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr) and/or comparable high-melting alloy elements.   
   
   
       2 . The blade mounting ring according to  claim 1 , by comprising the following alloy composition with the amounts of individual alloy elements, each given in percent by weight (wt %):
 C=0.4-0.6   Cr=18.27   Nb=1.4-1.8   Ni=12-22   S=0.2-0.5   Si=2.9-3.2   W=2.4-2.8   remainder=iron   impurities and/or unspecified alloy elements up to 3.   
   
   
       3 . The blade mounting ring according to  claim 2 , by comprising the following alloy composition with amounts of the individual alloy elements, each given in percent by weight (wt %):
 C=0.4-0.6   Cr=18.5-20.5   Nb=1.4-1.8   Ni=12.5-14   S=0.25-0.45   Si=2.9-3.15   W=2.4-2.8   remainder=iron   impurities and/or unspecified alloy elements up to 3.   
   
   
       4 . The blade mounting ring
 according to  claim 2 , comprising the following alloy composition with amounts of the individual alloy elements, each given in percent by weight (wt %):   C=0.4-0.6   Cr=24.5-26.5   Nb=1.4-1.8   Ni=19.5-21.5   S=0.25-0.45   Si=2.9-3.15   W=2.4-2.8   remainder=iron   impurities and/or unspecified alloy elements up to 3.