Patent ID: 9638138
Date: 2017-05-02
CPC Classifications: F01D,F02M,F04D,F16C

Claim:
1. A turbocharger, comprising: a turbine that includes a turbine wheel; a compressor that includes a compressor wheel; a bearing housing disposed and connected between the turbine and the compressor, the bearing housing forming a bearing bore and first and second oil feed passages; a shaft rotatably disposed within the bearing housing and extending into the turbine and the compressor, wherein the turbine wheel is connected to one end of the shaft and wherein the compressor wheel is connected to an opposite end of the shaft such that the turbine wheel is rotatably disposed in the turbine and the compressor wheel is rotatably disposed in the compressor; first and second bearings disposed between the shaft and the bearing housing, each of the first and second bearings formed between an outer race disposed in the bearing bore, and an inner race disposed in the outer race; wherein the outer race has a hollow cylindrical shape that forms an outer wall that engages the bearing bore along first, second, third and fourth cylindrical bearing surfaces, the outer wall having a first end disposed adjacent the first bearing surface and a second end disposed adjacent the fourth bearing surface; wherein close to the first end, the outer wall forms a first oil feed galley that at least partially overlaps with the first oil feed passage and is disposed between the first and second bearing surfaces in an axial direction along the bearing bore; and wherein close to the second end, the outer wall forms a second oil feed galley that at least partially overlaps with the second oil feed passage and is disposed between the third and fourth bearing surfaces in the axial direction; wherein the outer race further forms first and second peripherally extending oil drainage grooves disposed between the second and third bearing surfaces, such that: