Patent ID: 7677041
Filing Date: 2010-03-16
Classification: F01D,F05D,F16C

Abstract:
1. A turbocharger for an internal combustion engine, comprising a stationary housing comprising an exhaust gas volute, a compressor casing and a bearing housing, a rotating assembly carried within the stationary housing, said rotating assembly comprising a shaft with a turbine wheel operatively associated with the exhaust gas volute at one end and a compressor wheel operatively associated with the compressor casing at the other end, and a bearing system for said shaft comprising an elongated cylindrical bearing carrier rotatably carried by the bearing housing on a film of lubricating oil and including at least two ball bearing means with their inner races axially spaced by a spacer and clamped together within said elongated cylindrical bearing carrier and supporting the shaft in the elongated cylindrical bearing carrier, the at least two ballbearing means including a first ball bearing means adjacent the compressor end of the shaft and a second ball bearing means adjacent the turbine end of the shaft, said first ball bearing means comprising a bearing assembly including means for carrying axial thrust in both directions, said second ball bearing means including a ball bearing that carries no thrust at all with an outer race that is free to move axially within the elongated cylindrical bearing carrier, and resilient means between the elongated cylindrical bearing carrier and said outer race for biasing said outer race axially into engagement with the balls in said ball bearing.