Turbocharger rotating assembly

A turbocharger rotating assembly comprising:

• a bearing;
• a shaft and turbine wheel assembly supported by the bearing;
• a seal ring disposed about the shaft;
• and
• a sleeve that supports the bearing and that comprises
• a compressor end and a turbine end,
• a bore extending axially from the compressor end to the turbine end,
• a first counter bore that forms an axial face that axially locates the bearing in the bore,
• a second counter bore disposed axially between the first counter bore and the turbine end wherein the second counter bore comprises a seal surface that forms a lubricant and exhaust seal with the seal ring disposed about the shaft, and
• a securing feature to secure the sleeve with respect to a turbocharger housing wherein the bearing, as axially located in the bore of the sleeve, extends outward axially from the compressor end of the sleeve.

A method comprising:

• providing a sleeve with seal components, a bearing cartridge, a turbine shaft and wheel assembly, and a turbine seal ring wherein the sleeve comprises
• a compressor end and a turbine end,
• a bore extending axially from the compressor end to the turbine end,
• a lubricant passage extending radially from an axial position along an outer surface of the sleeve to an axial position along the bore of the sleeve,
• a first counter bore disposed axially between the axial position of the lubricant passage along the bore and the turbine end wherein the first counter bore forms an axial face to axially locate the bearing cartridge in the bore of the sleeve,
• a second counter bore disposed axially between the first counter bore and the turbine end wherein the second counter bore comprises a seal surface to form, in part, a lubricant and exhaust seal with the turbine seal ring, and
• a lubricant drainage passage disposed, at least in part, axially between the first counter bore and the second counter bore;
• positioning the bearing cartridge with respect to the sleeve to form a sleeve and bearing cartridge assembly;
• assembling the turbine seal ring to the turbine shaft and wheel assembly;
• and
• inserting the shaft of shaft and turbine wheel assembly with the seal ring into the bearing cartridge assembly to form a sleeve assembly.

A sleeve for a turbocharger rotating assembly, the sleeve comprising:

• a compressor end and a turbine end;
• a bore extending axially from the compressor end to the turbine end;
• a lubricant passage extending radially from an axial position along an outer surface of the sleeve to an axial position along the bore of the sleeve;
• a first counter bore disposed axially between the axial position of the lubricant passage along the bore and the turbine end wherein the first counter bore forms an axial face to axially locate a bearing in the bore of the sleeve and wherein the first counter bore comprises an angle of less than 360 degrees;
• a second counter bore disposed axially between the first counter bore and the turbine end wherein the second counter bore comprises a seal surface to form, in part, a lubricant and exhaust seal;
• and
• a securing feature to secure the sleeve with respect to a turbocharger housing.

A turbocharger rotating assembly comprising:

• a bearing;
• a shaft and turbine wheel assembly supported by the bearing;
• a seal ring disposed about the shaft;
• and
• a sleeve that supports the bearing and that comprises
• a compressor end and a turbine end,
• a bore extending axially from the compressor end to the turbine end,
• a first counter bore that forms an axial face that axially locates the bearing in the bore,
• a second counter bore disposed axially between the first counter bore and the turbine end wherein the second counter bore comprises a seal surface that forms a lubricant and exhaust seal with the seal ring disposed about the shaft, and
• a securing feature to secure the sleeve with respect to a turbocharger housing wherein the securing feature comprises a socket disposed along an axial face of the sleeve at the compressor end.