Gear train joint

A gear train assembly for a turbocharger, the gear train assembly comprising:

• a drive shaft coupled to a turbine wheel and a sun gear;
• a plurality of planetary gears;
• a planet carrier extending from a center axis of the plurality of planetary gears through a primary bearing;
• a gear support coupled to a housing of the turbine wheel;
• and
• a bearing support, the bearing support comprising:
• a body;
• a bore extending axially through the body and dimensioned to receive the primary bearing and a portion of the planet carrier;
• and
• a plurality of pilots, each pilot formed on an external surface of the body and each pilot machined for interference fit with a different component of the turbocharger.

A turbocharger, the turbocharger comprising:

• a turbine wheel housed in a turbine housing having an end wall;
• a compressor impeller housed in a compressor housing;
• a shaft extending between the turbine wheel and the compressor impeller, the turbine wheel and the compressor impeller being mounted on the shaft for rotation together;
• and
• a gear train driven by an engine, the gear train comprising:
• a drive shaft coupled to a turbine wheel;
• a plurality of planetary gears;
• a planet carrier configured to couple the plurality of planetary gears together;
• and
• a bearing support, the bearing support comprising:
• a body;
• a bore extending axially through the body and dimensioned to receive a portion of the planet carrier;
• and
• four pilots, each pilot configured to form an interference fit between an external surface of the bearing support and a surface of a corresponding component of the turbocharger.