Charger device with variable turbine geometry
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.
1. A charger device comprising:
a variable turbine geometry having guide vanes mounted rotatably in a vane bearing ring, each guide vane having a top side that runs continuously in convex fashion from a profile nose to a profile end,
wherein a concave recess is arranged on a bottom side of each guide vane, and
wherein for each guide vane, a radius of curvature of the recess is between ¼ and ⅛ of a length of the guide vane.
2. A charger device according to claim 1 , wherein, for each guide vane, the bottom side runs in concave fashion from the concave recess to the profile end, and a radius of curvature of the bottom side is greater than a radius of curvature of the recess.
3. A charger device according to claim 1 , wherein, for each guide vane, the radius of curvature of the recess is between ⅕ and 1/7 of a length of the guide vane.
4. A charger device according to claim 1 , wherein, for each guide vane, the profile end is rounded with a radius of curvature that is between 1/15 and 1/25 of the radius of curvature of the recess.
5. A charger device according to claim 1 , wherein an axis of rotation of each guide vane lies on a profile centreline, wherein a spacing of the axis of rotation to the profile nose is smaller than a spacing to the profile end.
6. A guide vane of a charger device, comprising:
a top side and a bottom side, the top side running in convex fashion from a profile nose to a profile end, a centerline from the profile nose to the profile end being continuous, and
a concave recess arranged on the bottom side at the profile nose,
wherein a radius of curvature of the recess is between ¼ and ⅛ of a length of the guide vane.
7. A guide vane according to claim 6 , wherein the bottom side runs in concave fashion from the concave recess to the profile end, and a radius of curvature of the bottom side is greater than a radius of curvature of the recess.
8. A guide vane according to claim 6 , wherein the radius of curvature of the recess is between ⅕ and 1/7 of a length of the guide vane.
9. A guide vane according to claim 6 , wherein the profile end is rounded with a radius of curvature that is between 1/15 and 1/25 of a radius of curvature of the recess.
10. A guide vane according to claim 6 , wherein an axis of rotation of the guide vane lies on a profile centreline, a spacing of the axis of rotation to the profile nose being smaller than a spacing to the profile end.
11. A charger device according to claim 2 , wherein an axis of rotation of each guide vane lies on a profile centreline, wherein a spacing of the axis of rotation to the profile nose is smaller than a spacing to the profile end.
12. A charger device according to claim 5 , wherein, for each guide vane, the profile end is rounded with a radius of curvature that is between 1/15 and 1/25 of the radius of curvature of the recess.
13. A charger device according to claim 3 , wherein, for each guide vane, the profile end is rounded with a radius of curvature that is between 1/15 and 1/25 of the radius of curvature of the recess.
14. A charger device comprising:
a variable turbine geometry having guide vanes mounted rotatably in a vane bearing ring, each guide vane having:
a top side and a bottom side, the top side running continuously in convex fashion from a profile nose to a profile end, and
a concave recess is arranged on a bottom side of the guide vane at the profile nose,
wherein the bottom side runs in concave fashion from the concave recess to the profile end, and a radius of curvature of the bottom side is greater than a radius of curvature of the recess,
wherein the profile end is rounded with a radius of curvature smaller than the radius of curvature of the recess, and
wherein a radius of curvature of the recess is between ¼ and ⅛ of a length of the guide vane.
15. A charger device according to claim 1 , wherein, for each guide vane, the recess is spaced apart from the profile nose.