Rotor mounting of an exhaust turbocharger

Abstract

The invention enables reliable feeding of lubricant for the rotor mounting of an exhaust turbocharger, wherein the rotary shaft is supported in a two row antifriction bearing, so that the lubricant is uniformly distributed to each of the rows of rolling bodies although the lubricant is supplied from one axial side of the bearing. The bearing inner ring is separated into two rings. A first inner ring is below and defines the inner race for one row of rolling bodies. Below the other row of rolling bodies is a second inner race comprised of two inner ring parts. The inner ring for the first row of rolling bodies extends radially inwardly and axially past the second inner ring parts for the second row of rolling bodies. An annular channel in the axially inner, first ring part of the second inner ring is connected with an axially extending passage that transmits lubricant to the annular channel. Respective lubricant transmission channels from the annular channel communicate with the axially opposite sides of the first inner ring part. These sides are respectively at the first and second rows of rolling bodies. This uniformly delivers lubricant to each of the inner races at each of the rows of rolling bodies. The quantities of axial passages and of lubricant transmission channels differ and are adapted to each other to provide a uniform lubricant flow to each of the rows of rolling bodies.