BorgWarner Inc.
Turbocharger and mating ring included therein

Abstract:

A turbocharger includes a shaft, a compressor wheel, and a seal assembly. The seal assembly includes a carbon ring having a carbon surface having a carbon ring inner diameter and a carbon ring outer diameter. The seal assembly also includes a mating ring having a mating surface facing the carbon surface of the carbon ring. The mating surface has a land portion configured to contact the carbon surface between a first mating diameter radially aligned with the carbon ring inner diameter and a second mating diameter radially aligned with the carbon ring outer diameter. The land portion has a land area between the first and second mating diameters. The mating surface defines a plurality of grooved portions. The plurality of grooved portions have a grooved area between the first and second mating diameters. A ratio of the land area to the grooved area is between 1.3 and 2.9.