Patent ID: 8491271

Claim:
An exhaust-gas turbocharger, comprising: a shaft that is axially arranged between a compressor wheel and a turbine wheel and that is rotationally fixed relative to the compressor and the turbine wheel, wherein the shaft includes a turbine-side end; a connecting piece having a turbine-wheel side, a shaft side, a first tubular flange, a floor, and a second tubular flange, wherein the connecting piece is an axial intermediate piece having the turbine-wheel side welded to the turbine wheel and the shaft side welded to the turbine-side end of the shaft, such that the connecting piece connects the turbine-side end of the shaft to the turbine wheel and is configured as a heat-conducting choke, wherein the first tubular flange is on the turbine-wheel side of the connecting piece and encloses an axial hollow space that remains between a front face of the turbine wheel and the floor of the connecting piece, wherein the second tubular flange is on the shaft side of the connecting piece and encloses a further hollow space that remains between the turbine-side end of the shaft and the floor of the connecting piece, and wherein the first tubular flange of the connecting piece is welded to the turbine wheel on an annular zone on the front face of the turbine wheel, and wherein the second tubular flange of the connecting piece is welded to the turbine-side end of the shaft.