Abstract: An impeller for an exhaust gas turbocharger may include a hub main body and blades arranged thereon. The hub main body may be configured as a polygon with a number of segments that may be tilted with respect to one another, the number of the segments corresponding to a number of the blades. Alternatively, the hub main body may have a main surface that faces the blades and undulates in a circumferential direction, a number of the undulations corresponding to the number of the blades.

Abstract: A charger device may include a variable turbine geometry having guide vanes mounted rotatably in a van bearing ring. Each guide vane may have a top side that runs in convex fashion from a profile nose to a profile end. A concave recess may be arranged on a bottom side of each guide vane at the profile nose.

Abstract: A charging device may include a compressor, a bearing housing, a shaft that is rotatably mounted in the bearing housing, a compressor wheel arranged on the shaft, and a diffuser, which may radially extend from a diffuser inlet on the compressor wheel towards a diffuser outlet on a spiral-shaped compressor housing. The diffuser may be delimited by a diffuser wall and a bearing housing wall. A first section of the bearing housing wall may be oriented originating from the diffuser inlet by an angle ranging from 2° to 30° obliquely to a radial direction, and may bring about a tapering of the diffuser cross section in the radial direction away from the shaft.

Abstract: An impeller for an exhaust gas turbocharger may include a hub main body and blades arranged thereon. The hub main body may be configured as a polygon with a number of segments that may be tilted with respect to one another, the number of the segments corresponding to a number of the blades. Alternatively, the hub main body may have a main surface that faces the blades and undulates in a circumferential direction, a number of the undulations corresponding to the number of the blades.

Abstract: A charger device may include a variable turbine geometry having guide vanes mounted rotatably in a van bearing ring. Each guide vane may have a top side that runs in convex fashion from a profile nose to a profile end. A concave recess may be arranged on a bottom side of each guide vane at the profile nose.

Abstract: A variable turbine geometry may have a blade bearing ring and guide blades, each rotatably mounted therein via one of a plurality of respective blade bearing pins. An adjusting ring for adjusting the rotary position of the guide blades may be arranged on a side of the blade bearing ring facing away from the guide blades. The cover disc may define through-openings aligned with the blade bearing pins of the guide blades. The blade bearing ring may define at least one channel configured to create a pressure equalization between the control space and the flow space.

Abstract: A turbine wheel for an exhaust gas turbocharger may include a body composed of a TiAl alloy via at least one of metal injection moulding, selective laser melting and electron beam melting. The body may include a plurality of blades each having an outlet blade root and an outlet blade tip disposed radially away from a rotation axis with respect to the outlet blade root. The body may have a quotient Q of a diameter dS defined by each of the outlet blade tips to a diameter dN defined by each of the oulet blade roots corresponding to the following relationship: Q=dS/dN>3.85.

Abstract: A variable turbine geometry may have a blade bearing ring and guide blades, each rotatably mounted therein via one of a plurality of respective blade bearing pins. An adjusting ring for adjusting the rotary position of the guide blades may be arranged on a side of the blade bearing ring facing away from the guide blades. The cover disc may define through-openings aligned with the blade bearing pins of the guide blades. The blade bearing ring may define at least one channel configured to create a pressure equalization between the control space and the flow space.

Abstract: The invention relates to an exhaust gas turbocharger (1) for a motor vehicle with a shaft (2) carrying a compressor wheel and a turbine wheel which is mounted in a bearing housing (3), wherein in the region of the mounting in the bearing housing (3) at least one shaft sealing ring (4) is provided which is held in a shaft-sided circumferential groove (5). It is substantial to the invention here that at least two axially adjacent shaft sealing rings (4, 4?) are provided which are held in corresponding shaft-sided circumferential grooves (5, 5?), that an outer diameter (D) of the shaft (2) surrounding the shaft-sided circumferential grooves (5, 5?) is different in size.