Bearing unit for a turbocharger

1. A bearing unit for a turbocharger comprising:

a bearing housing extending in an axial direction;

a bearing cartridge, situated within the bearing housing, having an outer bearing ring; and

a securing element, situated on the bearing housing, for the twist-free positioning of the outer bearing ring within the bearing housing,

a sum of forces acting on the outer bearing ring being zero.

2. The bearing unit as recited in claim 1 wherein an overall force acting on the outer bearing ring corresponds to the sum of the forces introduced by the securing element, a force of oil pressure, and a weight of the bearing cartridge.

3. The bearing unit as recited in claim 1 wherein the securing element is freely rotatable about its axis.

4. The bearing unit as recited in claim 1 wherein a plurality of securing elements is included, the securing elements being situated equidistantly along a periphery of the bearing housing.

5. The bearing unit as recited in claim 1 wherein the securing element is situated on an end-face side of the bearing housing.

6. The bearing unit as recited in claim 1 wherein a hole is provided for fastening the securing element.

7. The bearing unit as recited in claim 1 wherein the securing element is designed as a securing pin having a flattened area for contact with a counter-flattened area of the bearing cartridge.

8. The bearing unit as recited in claim 1 wherein the securing element is designed as a bolt fixedly situated in a shell of the bearing housing.

9. The bearing unit as recited in claim 1 further comprising a securing plate situated on an end-face side of the bearing housing.

10. The bearing unit as recited in claim 9 wherein the securing element is designed as a spring is situated on the securing plate.