Radial compressor for an exhaust gas turbocharger

1. A radial compressor for an exhaust gas turbocharger of an internal combustion engine comprising:

a compressor housing including an axial inlet channel and a radial outlet channel, wherein the compressor housing at least partially surrounds a compressor space;

a compressor wheel arranged in the compressor space for delivering and compressing a gas, wherein the compressor wheel includes an axial inlet side facing the inlet channel, a radial outlet side facing the outlet channel, and an axial wheel surface contour extending from the inlet side to the outlet side;

an adapter element substantially designed sleeve-like, the adapter element axially insertable into a fastening section provided on the compressor housing proximate to the axial inlet channel and fixed in a predetermined axial fixing position; and

wherein the adapter element having a first axial face end, which in the predetermined axial fixing position faces the compressor wheel, includes a surface contour at least in sections formed substantially complementarily to the axial wheel surface contour, wherein axially moving the adapter element in the fastening section in a non-fixed state of the adapter element adjust a gap width of a passage gap axially formed between the adapter element and the compressor wheel along the axial wheel and adapter element surface contours;

wherein the fastening section includes an internal thread and the adapter element includes an external thread that is complementary thereto, wherein the adapter element is moveable relative to the fastening section in the axial direction via the internal and external threads.

2. The radial compressor according to claim 1 , wherein the adapter element is fixed relative to the compressor housing in the predetermined axial fixing position by at least one of pressing and gluing.

3. The radial compressor according to claim 1 , wherein the adapter element includes a sleeve-like adapter element fastening section arranged complementary to the fastening section of the compressor housing, the sleeve-like adapter element fastening section merging in the axial direction towards the compressor wheel into an axial extension section on which the surface contour that is complementary to the axial wheel surface contour of the compressor wheel is arranged.

4. The radial compressor according to claim 3 , wherein at least one of the adapter element and the axial extension section is produced of a plastic material.

5. The radial compressor according to claim 3 , further comprising a seal between the axial extension section and the adapter element fastening section.

6. The radial compressor according to claim 1 , further comprising a sealing device configured between the compressor housing and the adapter element for sealing the adapter element against the compressor housing.

7. The radial compressor according to claim 6 , wherein the sealing device includes at least one of a sealing ring and a liquid seal.

8. The radial compressor according to claim 6 , wherein the adapter element includes a sleeve-like adapter element fastening section arranged complementary to the fastening section of the compressor housing.

9. The radial compressor according to claim 1 , wherein the compressor wheel is connectable to a turbine wheel in a rotationally fixed manner.

10. The radial compressor according to claim 1 , wherein the adapter element is moveable from the non-fixed position to the predetermined axial fixing position.

11. A method for producing a radial compressor, the method comprising:

providing a compressor housing including an axial inlet channel and a radial outlet channel, the compressor housing at least partially surrounding a compressor space, and a compressor wheel arranged in the compressor space for delivering and compressing a gas, wherein the compressor wheel includes an axial inlet side facing the inlet channel, a radial outlet side facing the outlet channel, and an axial wheel surface contour extending from the inlet side to the outlet side;

providing an adapter element substantially designed sleeve-like, the adapter element axially insertable into a fastening section provided on the compressor housing proximate to the axial inlet channel, the adapter element fixable in a predetermined axial fixing position, the fastening section including an internal thread and the adapter element including an external thread that is complementary thereto;

inserting axially the adapter element into the fastening section to the predetermined axial fixing position via the internal and external threads, wherein the surface contour of the adapter element at least partially contacts the axial wheel surface contour of the compressor wheel, and

fixing axially the adapter element to the compressor housing.

12. The method according to claim 11 , wherein providing the adapter element takes place with a rotating compressor wheel.

13. The method according to claim 11 , wherein providing the adapter element takes place with a stationary compressor wheel.