Flat gasket with calendered sieve layer

Patent metadata

Field	Value
Publication number	US-9518659-B2
Application number	US-201213261751-A
Country	US
Kind code	B2
Filing date	Apr 5, 2012
Priority date	Apr 7, 2011
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

The present invention relates to a flat gasket with filter elements. In order to fulfill the increased requirements with respect to cleanliness, there is an increased demand for the integration of filter elements in flat gaskets. The corresponding filter elements mainly serve for picking of impurities accrued during production as well as other residues circulate via the operational fluids, especially during the initial period of operation of an internal combustion engine or a vehicle.

First claim

The invention claimed is:

1. A flat gasket comprising:
at least a first metallic layer; and
a second metallic layer; and
a third layer arranged between the first and second metallic layer, with the first metallic layer comprising at least a first passage opening and the second metallic layer comprising at least a second passage opening, which are arranged adjacent to each other in a direction perpendicular to the planes of the layers, with the third layer adjacent to the first and second passage openings in a direction perpendicular to the planes of the layers showing no passage opening and spanning the passage openings in the plane of its layer, with the third layer as a sieve layer comprising a mesh material said mesh material comprising threads crossing each other while forming crossing points,
wherein the mesh material in the area spanning the first and second passage openings in the plane of its layer and encircling these passage openings in the plane of its layer, the total height of two threads crossing each other at the middle of a crossing point of the two threads is less than 1.4 times the height of a single thread at half the distance between vicinal crossing points.

2. The flat gasket according to claim 1 , wherein the mesh material in its entire area in the plane of the layer, for all crossing points, the total height of two threads crossing each other in the middle of the crossing point of the two threads is equal or less than 1.4 times the height of a single thread at half the distance between vicinal crossing points.

3. The flat gasket according to claim 1 , wherein the mesh material in at least a first area shows a degree of compression compared to the initial, non-compressed mesh material composed of threads with essentially round diameter of greater than 30%.

4. The flat gasket according to claim 3 , wherein the mesh material in at least a first area shows a degree of compression compared to the initial, non-compressed mesh material composed of threads with essentially round diameter of between 35% and at least 55%.

5. The flat gasket according to claim 1 , wherein in at least a first area, two crossing threads at their crossing point show a ratio of width to height of between 1.5 and 4.

6. The flat gasket according to claim 5 , wherein at least in the first area, two crossing threads at their crossing point show a ratio of width to height of between 2 and 3.

7. The flat gasket according to claim 1 , wherein in at least a first area several or all remaining free areas in the cross section of the sieve layer along the middle of one mesh thread, several mesh threads or all of the mesh threads show an area of less than or equal to 0.008 mm 2 per crossing point.

8. The flat gasket according to claim 7 , wherein at least in the first area several or all remaining free areas in the cross section of the sieve layer along the middle of one mesh thread, several mesh threads or all of the mesh threads show an area of less than or equal to 0.002 mm 2 per crossing point.

9. The flat gasket according to claim 1 , wherein at least in a first area the mesh material has been calendar compressed.

10. The flat gasket according to claim 1 , wherein the first layer, the second layer and the third layer each show at least one further passage opening, wherein the areas of the passage openings are arranged adjacent to each other in a direction perpendicular to the planes of the layers.

11. The flat gasket according to claim 1 , wherein the first and/or the second layer around at least one of the passage openings at least in sections, comprises a sealing bead.

12. The flat gasket according to claim 1 , wherein the first layer and/or the second layer at least on a surface of the first and/or second layer that face the sieve layer is coated with an elastomer.

13. The flat gasket according to claim 12 , wherein said elastomer is selected from the group consisting of FKM (vinylidene-fluoride-hexafluoropropylene copolymer) silicone rubber, NBR rubber (acryl-butadiene rubber), PUR (polyurethane), NR (natural rubber), HNBR (hydrated natural rubber), FFKM (perfluoro rubber), SBR (stryrene-butadiene rubber), BR (butadiene rubber), IIR (butyl rubber), FVSQ (silicone rubber), CSM (chlorosulfonated polyethylene), silicone and epoxide resins.

14. The flat gasket according to claim 1 , wherein the mesh threads are comprised of metal.

15. The flat gasket according to claim 14 , wherein the metal comprises steel, austenitic steel, ferritic steel, stainless steel, and/or carbon steel.

16. The flat gasket according to claim 1 , wherein the mesh threads are comprised of a thermoplast material or a thermoset material.

17. The flat gasket according to claim 16 , wherein the thermoplast material is a polyamide and the thermoset material is a polyester.

18. The flat gasket according to claim 1 , wherein the first layer and/or the second layer are comprised of stainless steel, spring steel, spring-hard steel or carbon steel.

19. The flat gasket according to claim 1 , wherein the sieve layer is comprised of a single piece of uniformly compressed mesh material.

20. The flat gasket according to claim 1 , wherein the sieve layer is comprised of a composition of at least two pieces with the pieces being connected to each other by at least one of an adhesive connection or a form-locking connection in the plane of the sieve layer.

21. The flat gasket according to claim 20 , wherein the connection of the at least two pieces is achieved through laser welding.

22. The flat gasket according to claim 1 , wherein the mesh material has a width of the mesh of 80 μm to 250 μm.

23. The flat gasket according to claim 22 , wherein the mesh material has a width of the mesh of 100 μm to 200 μm.

24. The flat gasket according to claim 1 , wherein the sieve material has a height of 10 μm to 1400 μm.

25. The flat gasket according to claim 24 , wherein the sieve material has a height of 60 μm to 400 μm.

26. The flat gasket according to claim 1 , wherein the mesh material is a woven material.

27. The flat gasket according to claim 26 , wherein the mesh material has a plain weave or a twill weave.

28. The flat gasket according to claim 26 , wherein said woven material comprises a first set of threads all oriented in a first direction and a second set of threads all oriented in a second direction different than the first direction.

29. The flat gasket according to claim 1 , wherein said sieve layer is only woven mesh.

30. The flat gasket according to claim 29 , wherein said sieve layer has compressed mesh areas that are impermeable within the plane of the mesh.

Assignees

• Egloff Georg
• Claus Oliver
• Waldvogel Hans
• Helfenbein Andreas
• Blersch Robert
• Reinz Dichtungs Gmbh

Inventors

• Egloff Georg
• Claus Oliver
• Waldvogel Hans
• Helfenbein Andreas
• Blersch Robert

Classifications

• B32B15/02 Primary

  Layer formed of wires, e.g. mesh · CPC title

• F16J15/0825

  laminated · CPC title

• F16J15/0818 Primary

  Flat gaskets · CPC title

• B01D39/2027

  Metallic material · CPC title

• F16J15/064

  the packing combining the sealing function with other functions · CPC title