RU117550U1 - SEALING GASKET - Google Patents

Abstract

 1. A sealing gasket containing at least one metal plate coated with one or two-sided three-layer coating made of adhesive, elastomeric and non-stick layers, characterized in that the metal plate is made of spring stainless steel with a chromium content of at least 16%, at least 3.5% nickel or spring low carbon steel with zinc or aluminum coating. ! 2. The sealing gasket according to claim 1, characterized in that the metal plate of spring low-carbon steel is coated with zinc or aluminum coating with a thickness of 0.0005 ... 0.005 mm. ! 3. The sealing gasket according to claim 1, characterized in that the adhesive layer with a thickness of 0.0002 ... 0.020 mm is made on the basis of silane or chloroprene rubber. ! 4. The sealing gasket according to claim 1, characterized in that the elastomeric layer with a thickness of 0.003 ... 0.25 mm is made on the basis of nitrile butadiene or fluorine rubber. ! 5. A sealing gasket according to claim 4, characterized in that the elastomeric layer is partially applied to the surface of the gasket in the places where the seal is created. ! 6. The sealing gasket according to claim 1, characterized in that the non-stick layer with a thickness of 0.003 ... 0.01 mm is made on the basis of polytetrafluoroethylene or paraffin or molybdenum disulfide or silicone polymer.

Description

The inventive utility model relates to the field of engine building, namely to gaskets that can be used in particular as gaskets for cylinder heads of automobile engines, as well as for other surfaces between which a seal must be provided, for example, as a variety of flange gaskets.

An analogue of the claimed utility model is a gasket made of a cushioning material containing a metal plate with one and / or two-sided coating made of sealing material (see G.V. Poroshin “Production of asbestos sheets”: Chemistry, 1984, from 7-12).

The disadvantage of this material is that the coating has low elastic properties and is subject to aging under the influence of elevated temperature, oil, coolant, which leads to breakthrough of gases, oil leakage and coolant.

The closest analogue of the claimed gasket is a gasket of gasket material according to the patent for utility model RU 93889 U1 (F02F 11/00, 05/10/2010).

Said cushioning material comprises a metal plate with one and / or two-sided coating of sealing material. The metal plate is made of spring chrome and / or stainless steel plate with a three-layer coating applied with a sealing material made of adhesive, elastomeric and non-stick layers.

The use of the specified cushioning material for the manufacture of gaskets can improve the tightness of the sealing surfaces. However, in accordance with Directives 2002/95 / EC and 2000/5 3 / EC, automotive components must not contain hexavalent chromium, which may be present in the coating. A stainless steel plate may have low heat resistance and strength, which may lead to destruction of the gasket material. The adhesive layer can break under the influence of aggressive engine media, while the elastomeric layer can peel off and pieces of the elastomer can clog the lubrication and cooling systems. The elastomeric layer can be destroyed during the operation of the car, as it is subject to thermal, mechanical and chemical effects. During storage, the gaskets can stick together, since the non-stick layer may not function as a release coating.

The essential features of the closest analogue:

- a metal plate with one or two-sided coating with a sealing material;

- made of adhesive, elastomeric and non-stick layers.

The task to be solved by the claimed utility model is:

- creating a gasket from a material that allows you to seal the mating flanges for a long time operation;

- prevention of damage to gaskets during storage and transportation. EFFECT: increased sealing tightness and gasket reliability.

Obtaining the specified technical result is decided by a gasket containing at least one metal plate coated with one or two-sided three-layer coating with a sealing material made of adhesive, elastomeric and non-stick layers. The metal plate is made of spring stainless steel with a chromium content of at least 16%, nickel at least 3.5%., Which provide high temperature resistance and strength of the gasket material or spring low carbon steel with zinc or aluminum coating with a thickness of 0.0005 ... 0.005 mm to prevent corrosion of the gasket material (used for cases where high strength and heat resistance of the material are not required, for example, for cooling system gaskets).

To improve the sealing properties and preserve them for a relatively long time, at least one metal plate around the openings of the combustion chambers of the gaskets of the cylinder head or gas channels of other gaskets can be made recesses or protrusions, called "zig" ("corrugations"), and around holes of various shapes of cooling channels, lubricants, valve follower rods, gas distribution chains, called functional, mounting holes, and also along the outer contour of the puncture Half a recess or protrusion, called “half-zigzags,” can be made in the back.

The applicant is a developer and manufacturer of metal gaskets for internal combustion engines and initially carries out experimental design work, on the basis of which the materials used for gaskets, their coatings and their sizes are determined experimentally.

Based on the experimental work and the data obtained, it was found that:

- to ensure reliable adhesion of the elastomeric coating with the metal plate, an adhesive layer (primer) with a thickness of 0.0002 ... 0.020 mm is made between them. To ensure resistance to coolant, depending on the nature of the elastomeric layer, the adhesive layer is made on the basis of silane or chloroprene rubber. The silane-based adhesive layer is 0.0002 ... 0.003 mm thick. The adhesive layer based on chloroprene rubber is made with a thickness of 0.003 ... 0.020 mm;

- to ensure reliable compaction of the surface roughness of the flanges on the adhesive layer, an elastomeric layer with a thickness of 0.003 ... 0.250 mm is made. For cylinder head gaskets, the elastomeric layer is made with a thickness of 0.018 ... 0.033 mm for the side in contact with the flanges of the mating parts, 0.003 ... 0.019 mm for the side in contact with another layer of the gasket for multilayer gaskets. During operation, the cylinder head gasket is subjected to thermal and mechanical stress due to changes in the thermal gap between the cylinder head and cylinder block, as well as to the effect of coolant, gasoline vapors, diesel fuel and oil. To ensure resistance to the above effects, the elastomeric coating is based on rubber fluoride. In order to save money in some cases, it is advisable to perform an elastomeric coating not on the entire surface of the metal plate, but only where it is necessary to provide a seal, especially in the area of zig and half zig.

The remaining gaskets made of sealing material with a three-layer coating are less susceptible to thermal and mechanical stress, and in order to save, in some cases, it is advisable to make an elastomeric coating based on nitrile butadiene rubber. For such gaskets, an elastomeric layer based on fluorine rubber is 0.03 ... 0.06 mm thick, on the basis of nitrile butadiene rubber - 0.06 ... 0.250 μm, depending on the degree of flatness and roughness of the flanges of the mating parts.

To eliminate burning during operation, as well as sticking and damage to gaskets during storage and transportation, an non-stick layer with a thickness of 0.003 ... 0.01 mm is made on the basis of polytetrafluoroethylene or paraffin or molybdenum disulfide or silicone polymer on the elastomeric layer.

The inventive gasket is illustrated by the following figures.

Figure 1 presents the sealing single-layer gasket with a one-sided coating of sealing material.

1 - metal plate;

2 - adhesive layer;

3 - elastomeric layer;

4 - non-stick layer.

Figure 2 presents the sealing single-layer gasket with a double-sided coating of the sealing material.

1 - metal plate;

2 - adhesive layer;

3 - elastomeric layer;

4 - non-stick layer.

Figure 3 presents the sealing single-layer gasket with a one-sided coating of the sealing material with a partial application of the elastomeric layer.

1 - metal plate;

2 - adhesive layer;

3 - elastomeric layer;

4 - non-stick layer.

The inventive gasket allows you to seal the mating flanges for a long time operation and prevent damage to the gaskets during storage and transportation.

Claims (6)

1. A sealing gasket containing at least one metal plate coated with one or two-sided three-layer coating made of adhesive, elastomeric and non-stick layers, characterized in that the metal plate is made of spring stainless steel with a chromium content of at least 16%, at least 3.5% nickel or spring low carbon steel with zinc or aluminum coating. 2. The sealing gasket according to claim 1, characterized in that the metal plate of spring low carbon steel is coated with a zinc or aluminum coating with a thickness of 0.0005 ... 0.005 mm. 3. The sealing gasket according to claim 1, characterized in that the adhesive layer with a thickness of 0.0002 ... 0.020 mm is made on the basis of silane or chloroprene rubber. 4. The sealing gasket according to claim 1, characterized in that the elastomeric layer with a thickness of 0.003 ... 0.25 mm is made on the basis of nitrile butadiene or fluorine rubber. 5. The sealing gasket according to claim 4, characterized in that the elastomeric layer is partially applied to the surface of the gasket in the places where the seal is created. 6. The sealing gasket according to claim 1, characterized in that the non-stick layer with a thickness of 0.003 ... 0.01 mm is made on the basis of polytetrafluoroethylene or paraffin or molybdenum disulfide or silicone polymer.