Patent ID: 7086842
Filing Date: 2006-08-08
Classification: F01D,F05D

Abstract:
1. A turbocharger comprising: a turbine wheel mounted to a seal boss provided at one end of a shaft for rotation about an axis with a turbine housing; a compressor wheel mounted to the other end of the shaft for rotation about said axis within a compressor housing; the shaft rotating on bearing assemblies housed within a bearing housing located between the compressor housing and the turbine housing and provided with oil passages for delivering oil to the bearing assemblies; the turbine wheel being separated from the interior of the bearing housing by a housing wall; the seal boss extending through an annular passage provided through said housing wall and sealed with respect thereto by seal means disposed within an annular gap defined around the seal boss within the annular passage; the seal boss having an inboard axial end which extends into the bearing housing and has an annular face forming a radial shoulder around the shaft; the bearing housing defining an oil collecting groove radially recessed into the bearing housing adjacent said bearing housing wall and having an opening at least partially surrounding the shaft and axially overlapping the inboard end of the seal boss; wherein the annular face of the seal boss is angled relative to a radial plane extending through the shaft so that as the shaft rotates oil present on the annular face of the seal boss is projected into the oil collecting groove in a direction radially away from the shaft and axially away from the passage through said housing wall.