Flat gasket and internal combustion engine having such a flat gasket

Patent metadata

Field	Value
Publication number	US-11054034-B2
Application number	US-201716320225-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Aug 2, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

Flat gaskets for internal combustion engines are described. The flat gaskets may be used in internal combustion engines, in particular in engines with liners.

First claim

The invention claimed is:

1. A flat gasket for sealing between mutually facing surfaces of a crankcase and of a cylinder head of an internal combustion engine around a through-opening which passes through the entire flat gasket, comprising:
a first metal layer with a first side having a first surface and with a second side having a second surface, and at least one first region which runs on the first side around the through-opening,
wherein the first region is convexly raised,
wherein the first region on the first surface has a first profiling which is integrally formed in the first surface and which extends on the first region around the through-opening, and
the first profiling has, transversely to the direction of extension thereof and in an alternating fashion, elevations which repeat at least once and in each case a depression between each two adjacent elevations,
wherein a width BS of the convexly raised first region is greater than or equal to 800 μm and a width BP of a single elevation in the first profiling less than 400 μm.

2. The flat gasket according to claim 1 , wherein the second surface has, in a second region located opposite the first region, no profiling with elevations and/or depressions, including no profiling with elevations and/or depressions of equal dimensions to those of the first profiling.

3. The flat gasket according to claim 1 , wherein the second surface has, in at least one third region which is directly or indirectly adjacent to at least one second region arranged in the second surface opposite the first region, including in a third region arranged between two different second regions, a second profiling with elevations and/or depressions, said second profiling being integrally formed in the second surface and extending around the through-opening.

4. The flat gasket according to claim 3 , wherein the second profiling has, transversely to the direction of extension and in an alternating fashion, elevations which repeat at least once and in each case a depression between each two adjacent elevations,
wherein the second profiling and/or the first profiling may have identical or different structures.

5. The flat gasket according to claim 4 , wherein the height or depth of the elevations and depressions of the second profiling is smaller than the height or depth of the elevations and depressions of the first profiling.

6. The flat gasket according to claim 1 , wherein the elevation of the first profiling that is arranged centrally in the first region or the elevations of the first profiling that are arranged on either side of the centre of the first region and at the smallest distance from said centre are higher than one, some or all of the elevations adjacent thereto.

7. The flat gasket according to claim 3 , wherein the elevation of the second profiling that is arranged centrally in the third region or the elevations of the second profiling that are arranged on either side of the centre of the third region and at the smallest distance from said centre are higher than one, some or all of the elevations adjacent thereto.

8. The flat gasket according to claim 1 , wherein for a layer thickness D of the metal layer in the first region and for a height H between the elevation and the adjacent depression, D≥H.

9. The flat gasket according to claim 8 , wherein H≤0.25 mm.

10. The flat gasket according to claim 1 , wherein the width of a depression is equal to or greater than 100 μm.

11. The flat gasket according to claim 1 , wherein a raised height HS of the first region is HS≥0.07 mm.

12. The flat gasket according to claim 3 , wherein the first and/or second profiling extends largely parallel to the direction of extension of the first region.

13. The flat gasket according to claim 1 , further comprising one or more further metal layers, which are arranged adjacent to the first metal layer.

14. The flat gasket according to claim 3 , wherein the second and/or third region is of convex shape.

15. The flat gasket according to claim 3 , wherein the first metal layer in the first, second and/or third region is configured as a bead.

16. The flat gasket according to claim 1 , wherein the first metal layer is made of or contains carbon steel or a non-spring-tempered stainless steel.

17. The flat gasket according to claim 1 , wherein the flat gasket is arranged between a crankcase and a cylinder head, with the first surface of said flat gasket pointing towards the cylinder head and the second surface pointing towards the crankcase.

18. The flat gasket according to claim 17 , wherein the crankcase has at least one liner and the first region of the metal layer, in projection into a common plane, is arranged in the region of the liner and/or adjacent to the liner.

19. The flat gasket according to claim 17 , wherein the crankcase has at least one liner which has a region that runs adjacent to and parallel to the first region around the through-opening and bulges upwards in relation to the radially inwardly and/or outwardly adjoining regions of the surface of the crankcase.

Assignees

• Reinz Dichtungs Gmbh

Inventors

• Heuschmid Michael
• Hoehe Kurt
• Krautmann Wilhelm
• Kuhn Wilhelm
• Salzmann Jochen
• Waldvogel Hans

Classifications

• F16J15/0818 Primary

  Flat gaskets · CPC title

• F16J15/0881

  the sealing effect being obtained by plastic deformation of the packing · CPC title