Particle separator with a metal layer through which exhaust gas can flow and motor vehicle having at least one particle separator

1. A particle separator for the treatment of exhaust gases of an internal combustion engine, the particle separator comprising:

a housing having an inlet opening, an outlet opening, a cross section, regions being at least mutually spaced apart or opposite one another, and a central axis; and

at least one metallic layer through which an exhaust gas can flow, said at least one metallic layer disposed in said housing;

said at least one metallic layer having an undulation with peaks and troughs spanning said cross section of said housing, said undulation extending rectilinearly from one of said regions of said housing to another of said regions of said housing being at least mutually spaced apart or opposite one another; said undulation having a maximum running transversely relative to said housing and a minimum running transversely relative to said housing; and said maximum and said minimum being spaced apart in the axial direction by a spacing corresponding at least to an average radius of said housing; and

said at least one metallic layer having openings with a width in a range of from 0.1 to 0.2 mm.

2. The particle separator according to claim 1 , wherein said peaks and troughs of said undulation span said cross section as secants.

3. The particle separator according to claim 1 , wherein said undulation runs in a plane perpendicular to said central axis.

4. The particle separator according to claim 1 , wherein said undulation extends through a plane inclined relative to said central axis.

5. The particle separator according to claim 3 , wherein said undulation has an undulation rise inclined relative to said plane by at least 45°.

6. The particle separator according to claim 4 , wherein said undulation has an undulation rise inclined relative to said plane by at least 45°.

7. The particle separator according to claim 1 , wherein said at least one metallic layer is disposed in an encircling gap in said housing.

8. The particle separator according to claim 1 , wherein said at least one metallic layer is a screen layer with a filter-free construction.

9. A motor vehicle, comprising:

at least one internal combustion engine;

an exhaust system associated with said at least one internal combustion engine and having an exhaust-gas recirculation line; and

at least one particle separator according to claim 1 disposed in said exhaust-gas recirculation line.

10. The particle separator according to claim 1 , wherein said at least one metallic layer is a screen layer.

11. The particle separator according to claim 1 , wherein said at least one metallic layer is a single metallic layer.

12. The particle separator according to claim 1 , wherein said at least one metallic layer is formed with a plurality of plies including:

a first ply for screening out the particles, and

a second ply for fixing said first ply in said housing.

13. The particle separator according to claim 1 , wherein said undulation of said metallic layer forms displacement devices, and said displacement devices outwardly displace centrally retained particles.

14. The particle separator according to claim 1 , wherein said metallic layer has an accumulation side with a surface having a rough form breaking down retained particles during a forced relative movement.

15. A particle separator for the treatment of exhaust gases of an internal combustion engine, the particle separator comprising:

a housing having an inlet opening, an outlet opening, a cross section, regions being mutually spaced apart, and a central axis; and

at least one metallic layer through which an exhaust gas can flow, said at least one metallic layer disposed in said housing and having an undulation with peaks and troughs spanning said cross section of said housing;

said undulation extending rectilinearly from one of said regions of said housing to another of said regions of said housing being mutually spaced apart, causing centrally retained particles to be displaced outward toward said housing due to an exhaust-gas flow; said undulation having a maximum running transversely relative to said housing and a minimum running transversely relative to said housing; and said maximum and said minimum being spaced apart in the axial direction by a spacing corresponding at least to an average radius of said housing.

16. The particle separator according to claim 15 , wherein said at least one metallic layer is a screen layer or a single metallic layer.

17. The particle separator according to claim 15 , wherein said at least one metallic layer is formed with a plurality of plies including:

a first ply for screening out the particles, and

a second ply for fixing said first ply in said housing.

18. The particle separator according to claim 15 , wherein said undulation of said metallic layer forms displacement devices, and said displacement devices outwardly displace centrally retained particles.

19. The particle separator according to claim 15 , wherein said metallic layer has an accumulation side with a surface having a rough form breaking down retained particles during a forced relative movement.

20. The particle separator according to claim 15 , wherein said peaks and troughs span said cross section as secants.

21. The particle separator according to claim 15 , wherein said undulation runs in a plane perpendicular to said central axis.

22. The particle separator according to claim 15 , wherein said undulation extends through a plane inclined relative to said central axis.

23. The particle separator according to claim 15 , wherein said at least one metallic layer is disposed in an encircling gap in said housing.

24. The particle separator according to claim 15 , wherein said at least one metallic layer is a screen layer with a filter-free construction.

25. A motor vehicle, comprising:

at least one internal combustion engine;

an exhaust system associated with said at least one internal combustion engine and having an exhaust-gas recirculation line; and

at least one particle separator according to claim 15 disposed in said exhaust-gas recirculation line.