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: 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.