HONEYCOMB BODY FOR EXHAUST-GAS AFTERTREATMENT, HAVING SLOTTED METAL FOILS

Abstract

A honeycomb body for the aftertreatment of exhaust gases from an internal combustion engine formed from a plurality of metal foils which are stacked on one another to form a layer stack and are wound around at least one center of rotation. The layer stack is formed alternatingly from smooth and at least partially structured metal foils, the metal foils have a foil width and a foil length. The width of the foils runs along the main throughflow direction of the honeycomb body from a gas inlet side to a gas outlet side, and the foil length runs transversely to this direction, wherein at least some metal foils have at least some slots which divide the respective metal foil into a plurality of segments.

Claims

1.-10. (canceled)

11. A honeycomb body configured for aftertreatment of exhaust gases from an internal combustion engine, comprising: a plurality of metal foils stacked on one another to form a layer stack and are wound around at least one center of rotation, wherein the layer stack is formed alternatingly from smooth and at least partially structured metal foils, wherein each of the plurality of metal foils has a foil width and a foil length, wherein the foil width runs along a main throughflow direction of the honeycomb body from a gas inlet side to a gas outlet side, and the foil length runs transversely to the foil width, wherein at least some of the plurality of metal foils have slots that divide a respective metal foil into a plurality of segments.

12. The honeycomb body as claimed in claim 11, wherein the slots run parallel to the foil length.

13. The honeycomb body as claimed in claim 11, wherein the slots are arranged parallel to one another along the foil width and the slots are spaced from one another along the foil length.

14. The honeycomb body as claimed in claim 11, wherein a plurality of slots in a row running along the foil length are spaced from one another by a connecting piece.

15. The honeycomb body as claimed in claim 11, wherein a plurality of slot rows are spaced from one another along the main throughflow direction.

16. The honeycomb body as claimed in claim 14, wherein each connecting piece between the slots of a slot row has a length of 0.5 mm to 20 mm.

17. The honeycomb body as claimed in claim 16, wherein the length of the connecting piece in a center and/or at an edge region of the metal foil is longer than the length of the connecting pieces between the center and the edge region of the metal foil.

18. The honeycomb body as claimed in claim 12, wherein the slot width in the direction of the foil width is less than one of 2 mm and 1 mm.

19. The honeycomb body as claimed in claim 14, wherein the slot rows are distributed unevenly along the foil width.

20. The honeycomb body as claimed in claim 14, wherein the spacings of the slot rows in a region of the gas inlet side are different from the spacings of the slot rows on the gas outlet side.

21. The honeycomb body as claimed in claim 15, wherein one of 1 to 20 slot rows are provided and 1 to 12 slot rows are provided.

22. The honeycomb body as claimed in claim 16, wherein each connecting piece between the slots of the slot row has a length of 1 mm to 10 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Aspects of the invention will be explained in more detail below with reference to the drawings, in which:

[0029] FIG. 1 is a plan view of a metal foil, wherein the slot rows spaced along the foil width and the slots arranged in the slot row along the foil length are shown;

[0030] FIG. 2 is a sectional view through a honeycomb body in a support pipe, wherein a plurality of slot rows are spaced evenly along the main throughflow direction;

[0031] FIG. 3 is a sectional view through a honeycomb body in a support pipe, wherein a plurality of slot rows are spaced unevenly along the main throughflow direction; and

[0032] FIG. 4 is a sectional view through a honeycomb body in a support pipe, wherein a plurality of slot rows are spaced unevenly along the main throughflow direction, wherein the spacings of the slot rows on the gas inlet side and on the gas outlet side are different.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0033] FIG. 1 shows a plan view of a metal foil 1. The metal foil 1 shown is a smooth metal foil without any structuring. That which is described below for this smooth metal foil 1 can also equally apply to a metal foil which is structured at least in some sections.

[0034] The metal foil 1 has a plurality of slots 2, which run along the foil length 3. The individual slot rows 4 are spaced from one another and arranged parallel to one another in the direction of the foil width 5. The metal foil 1 is divided into segments 8 by the slot rows 4. The segments 8 are arranged adjacently to one another in the axial direction of the finished honeycomb body.

[0035] Connecting pieces 6, 7 are arranged between the individual slots 2 of a slot row 4. In the exemplary embodiment of FIG. 1, the connecting pieces 6 in the center of the metal foil 1 and at the outer edge regions are wider than the connecting pieces 7 in the intermediate region.

[0036] The metal foil 1 forms a single layer in the layer stack, which is then wound up to form the honeycomb body.

[0037] FIG. 2 shows a sectional view through a honeycomb body 9, which is arranged in a casing pipe 10. Flow can pass through the honeycomb body 9 from a gas inlet side 11 to the gas outlet side 12 along the flow ducts 16 formed by the metal foils. Reference sign 13 denotes the slots which divide the honeycomb body 9 into a plurality of segments 14. In the exemplary embodiment of FIG. 2, the slot rows 15 are arranged equidistantly over the axial extent of the honeycomb body 9.

[0038] FIG. 3 shows a honeycomb body 9 in a casing pipe 10. The honeycomb body 9 corresponds to the structure of the honeycomb body 9 shown in FIG. 2. The reference signs are the same for identical elements.

[0039] In contrast to FIG. 2, the slot rows 15 are distributed unevenly, so a narrow segment 17 is formed in the region of the gas inlet side 11, which narrow segment is adjoined by a plurality of equally wide segments 18.

[0040] FIG. 4 shows an alternative configuration of a honeycomb body 9. The slot rows 19 are arranged such that the segments 20 get continuously wider from the gas inlet side 11 to the gas outlet side 12.

[0041] The different features of the individual exemplary embodiments can also be combined with one another. The slot rows can also be arranged differently from the exemplary embodiments shown here. For instance, the segments can also get wider or narrower from the gas outlet side to the gas inlet side.

[0042] The exemplary embodiments of FIGS. 1 to 4 have, in particular, no limiting character and serve to illustrate the concept of the invention.

[0043] Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.