DE6939491U - CYLINDER HEAD GASKET - Google Patents

Description

The invention relates to a metallic cylinder head gasket, which is designed so that in the area of the passages to be sealed high pressures with intervening, not pressed surface sections can be achieved with high stability of the seal structure.

There are numerous attempts to achieve this goal, for example by using solid metal seals or metal sheet seals. Solid metal seals are known, in which by depressions between the edges to be sealed, the high pressure described is sought. Apart from the difficult and With this design, expensive production is an adaptation to the conditions of the installation site because of the massive structure only possible to a limited extent. Other massive metal seals have bead-like deformations on passages to be sealed, which lead to a local increase in pressure should lead. Such beads are, however, under the clamping forces and the operational

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flattened with changing pressure so far that a wide contact of the surfaces cannot be prevented. This reduces the Pressing on the edges to be sealed. Ultimately, it will be almost the same as the pressure on the rest of the sealing surface. Apart from that This pressure adjustment can also result in excess combustion gases, for example, because of the system Do not relax freely over the entire sealing surface. There is therefore the risk that gas leakage is insignificant per se Trespass into water spaces and thus lead to a considerable disruption the engine cooling.

Metal gaskets with folds or individual bezels are widely known at passages to be sealed, in which the sum of the thickness of the individual sheets at all points of the seal is the same, or in the case of those at certain passages to be sealed edging plates by a corresponding combination of individual layers protrude from the rest of the sealing surface. This design requires a great deal of care during manufacture and is therefore expensive.

Other designs are based on a metallic carrier plate, which is formed like a bead at the passages to be sealed. This carrier plate is covered on both sides by metal layers, at least in the area of the beads. The metal layer packages thus formed are encased with edging at passages to be sealed and at screw holes. These are in width designed so that they cover the beads of the metallic carrier plate. These edging take over to be sealed The actual sealing function passages while they are at Screw passages serve to support the clamping forces. This design has the particular advantage that, in addition to the high pressure on the edges to be sealed, there is also free space

for exceeding gas quantities that are normally harmless for engine operation. However, it can only be produced with great effort and therefore relatively expensive.

The object of the invention is to create a seal which can achieve a high pressure at the edges to be sealed and j

on the other hand, can be produced with normal means and as cheaply as possible have to be. This object is achieved in that a metallic sheet metal layer on the combustion chamber passages and optionally is beaded outwards at other openings and so over a limited width a thickness that is twice that of the base plate receives. To adjust the installation height and achieve appropriate support, other passages, such as fluid openings and screw holes, in the known manner with metallic edging Mistake.

The formation according to the invention on doubled parts can be deformed flat or bead-like. In the same way, the Metallic sheet metal layer to be sealed liquid passages and screw holes be flat or beaded. This is an additional one Given the possibility of the compression and the plastic and elastic adaptability to the respective installation to vote. Normally the thickness of the metal sheet metal layer will be between 0.3 and 1.0 mm. The width of the outward flanged sheet metal section will be between 1.5 and 6 mm. the The edge width of the metallic edging on the other passages depends, among other things, on the function and the acting Forces, the available space and the training with or without a bead. It can be equal or unequal. In the in most cases the width will be 1 to 5 mm.

The metallic sheet metal layer is depending on the load conditions made of steel, brass or other suitable materials

intended. The edging on fluid passages and screw holes can be made of steel, mossing, copper, aluminum or other materials. In special cases, the or the inserted into the metallic sheet metal layer metallic edging upstream elastomer profile parts the liquid seal can be achieved. The sealing effect can through soft metal or elastomeric coatings increase.

The drawing shows examples of seals according to the invention:

Figure 1 shows a top view of a seal, Figures 2 and 3 show cross sections of the seal.

In Figure 1, the reference numeral 1 denotes the metallic sheet metal layer and 2 a combustion chamber passage. The one folded outwards Beading 3 of the metal sheet metal layer leads to a local duplication, as will be seen from the description below Figures 2 and 3 can be seen. Numeral 4 denotes a screw through hole. Fluid passages are indicated with 5 and 6.

In Figure 2, the metallic sheet metal layer is denoted by 7. The flanging turned outwards is marked with an 8. The reference numeral 9 shows a metal edge border fastened to the metal sheet metal layer, as is the case with screw through-holes and fluid passages is used.

Figure 3 shows a seal cross-section with the opposite Figure 2 shows the area of double the sheet metal thickness 10 in the form of a bead is executed. The metallic sheet metal layer 11 is provided with a bead 12, which is located under the metallic border 13 lies.

The embodiment according to the invention represents a functionally flawless, on the basis of the known sealing & usructions respective application cases can be easily coordinated «and in production inexpensive design. It bends the advantage of metallic seals, especially in their high strength and good stamina. The formation of the seal with twice the sheet metal thickness at the combustion chamber passage and the thickness-wise one Coordination of the metallic edging of the liquid passages and screwdrivers IaAt between the ones to be sealed Adequate space is free in passages in which any gas quantities that may leak can relax without, for example, entering the cooling water room can.

Claims (3)

Protection claim 1. Cylinder head gasket for reciprocating piston engines, piston compressors and similar machines consisting of one Sheet metal layer and metallic edging on fluid and screw passages, with the Sheet metal layer in the area under the metal edging can be flat or beaded, characterized in that the sheet metal layer on the combustion chamber passage by folding it outwards is doubled. 2. Cylinder head gasket according to claim 1, characterized in that that the area of the doubling is deformed like a bead. 3. Cylinder head gasket according to claim 1, characterized in that at least the metallic sealing surfaces are provided with an elastomeric coating.