Cylinder head gasket

Abstract

1. Cylinder Head Gasket

Description

Claims

1. Cylinder head gasket (1) for an internal combustion piston engine, having at least one gasket layer (21, 23, 25) of metallic material which defines the main gasket plane and which has at least one combustion chamber through opening (3), on the edge of which there is a circular ring-shaped combustion chamber sealing area (15), characterized in that the combustion chamber sealing area (15) is vertically profiled such that measured perpendicular to the main gasket plane it has a different thickness in different peripheral areas.

2. The cylinder head gasket as claimed in claim 1, wherein the respective combustion chamber sealing area (15) is surrounded by bolt passage openings (7) for cylinder head bolts, which are configured at intervals from one another at a radial distance from the combustion chamber sealing area (15), and wherein the combustion chamber sealing area preferably in the peripheral areas (35, 37, 39, 41) located between the bolt passage holes (7) has a greater thickness than in peripheral areas (27, 29, 31, 33) nearer the bolt passage holes (7).

3. The cylinder head gasket as claimed in claim 2, wherein the course of the vertical profiling caused by different thicknesses of the peripheral areas of the combustion chamber sealing area (15) along the periphery is selected such that in the installed state along the periphery the desired compressive sealing load per unit area is continuously formed.

4. The cylinder head gasket as claimed in claim 2, wherein the thicknesses of the combustion chamber sealing area (15) which are different in areas are produced by plastic deformation.

5. The cylinder head gasket as claimed in claim 4, wherein the deformation is produced by rolling treatment.

6. The cylinder head gasket as claimed in claim 4, wherein the deformation is produced by extrusion.

7. The cylinder head gasket as claimed in claim 4, wherein there is a bead (27) which runs along the periphery of the combustion chamber sealing area (15) in the gasket layer (21).

8. The cylinder head gasket as claimed in claim 7, wherein the bead (27) has a different geometry and/or different material properties as a contribution to formation of the vertical profiling along the periphery caused by the locally different thicknesses of the combustion chamber sealing area (15).

9. The cylinder head gasket as claimed in claim 8, wherein it is a combination of several gasket layers (21, 23, 25), on the combustion chamber sealing area (15) the layer (21) which contains the bead (27) being overlapped by at least one layer (23, 25) which has been folded over the bead (27) and which forms the edge-side enclosure of the combustion chamber sealing element (15).

10. The cylinder head gasket as claimed in claim 9, wherein the gasket layer (23, 25) folded over the bead (27) extends essentially over the entire surface of the cylinder head gasket (1).

11. The cylinder head gasket as claimed in claim 2, wherein in the intermediate areas (35, 37, 39, 41) located between the bolt passage openings (7) the increase of the thickness matched to the different operating conditions prevailing in these areas is chosen to be different.

12. The cylinder head gasket as claimed in claim 1, wherein the thickness changes between the peripheral areas (29, 31, 33, 35, 37, 39, 41) take place in a continuous, gentle transition.

13. Process for producing a cylinder head gasket as claimed in claim 9, wherein the vertical profiling is effected on the combination of several gasket layers (21, 23, 25) by means of a forming tool which acts from the outside on the combination, on the combustion chamber sealing area (15) the layer (21) containing the bead (27) being overlapped by at least one layer (23, 25) which has been folded over the bead (27) and which forms the edge-side enclosure of the combustion chamber sealing area (15).