| 摘要 |
A flat gasket including a sealing plate having a media-passage opening, a spring steel functional layer with a sealing bead surrounding the media-passage opening, and a second sealing layer formed of a deformable second steel sheet, which has an original thickness and an original hardness and around the media-passage opening forms an annular zone, which has at least one annular region that is thickened compared with the original thickness and forms an annular groove for engagement of the sealing bead, wherein the second sealing layer in the thickened annular region has a greater hardness than the original hardness, and wherein the annular zone has (a) one thickened annular region, into which an annular groove is impressed on at least one side of the second sealing layer, or (b) in the radial direction relative to the media-passage opening, two thickened annular regions spaced apart to form the annular groove between them. |
| 主权项 |
1. A metallic flat gasket comprising a gasket plate having at least one media-passage opening and having, in the region of the media-passage opening, at least one spring steel functional layer formed of a first steel sheet with a sealing bead that surrounds the media-passage opening and is formed as a full bead with a bead crest arranged between two bead feet, and also a second gasket layer, which is directly adjacent to the functional layer and is formed of a second steel sheet, which is more easily deformable compared with spring steel, which second gasket layer has, around the media-passage opening, an annular zone adjacent thereto and, radially outwardly adjacently to said annular zone relative to the media-passage opening, has an original thickness and an original hardness of the second steel sheet, wherein the second gasket layer in its annular zone has at least one annular region that is thickened compared with the original thickness of the second steel sheet, which thickened annular region extends along the sealing bead in a plan view of the gasket plate and on the side of the second gasket layer facing towards the functional layer forms an annular groove, in which the sealing bead engages with its bead crest when the flat gasket is pressed, wherein the second gasket layer in the thickened annular region produced by deforming areas of the second steel sheet has a greater hardness, based on a strain hardening in said areas of the second steel sheet on account of the deformation, than the original hardness of the second steel sheet, and wherein
(a) the annular zone has only one thickened annular region, into which an annular groove is impressed on at least one side of the second gasket layer, or (b) the annular zone has, in the radial direction relative to the media-passage opening, two thickened annular regions arranged one behind the other and spaced apart from one another which form the annular groove between them. |
