Patent ID: 8641372
Filing Date: 2014-02-04
Classification: F01D,F02C,F05D,Y10T

Abstract:
1. A charging device comprising: a variable turbine geometry located between a bearing housing and a turbine housing, wherein said variable turbine geometry includes at least one guide blade rotatably mounted in a blade bearing ring, wherein at least one side of the blade bearing ring is directly exposed to a hot gas flow, while an opposing side of the blade bearing ring faces away from said hot gas flow and is indirectly exposed to the hot gas flow such that the blade bearing ring side directly exposed to the hot gas flow is produced of a first material and the opposing side that is indirectly exposed to the hot gas flow is produced of a second material, wherein the two materials having heat expansion coefficients are selected such that the blade bearing ring such that the blade bearing at operating temperatures expands evenly without warping; and wherein the blade bearing ring is configured from at least two discs with different materials, wherein the materials used have different heat expansion coefficients.