MXPA97000236A - Cilin head packaging - Google Patents

Abstract

The present invention relates to a cylinder head gasket, characterized in that it comprises: plural thin metal plates including two outermost thin metal plates, substantially planar having internal and external surfaces, and at least one internal thin metal plate having first and second surfaces, between the inner surfaces of the two outermost thin metal plates, each of said plural metal thin plates having at least cylinder orifices and orifices for fluid passage, and being laminated to form a structure of thin laminated plates; the inner and outer surfaces of each of said two outermost thin metal plates of the plural thin metal plates being substantially completely coated with a mixed material to form coating layers of uniform thickness, and the first and second surfaces of the plate metallic thin inner not being reve with the mixed material, so that adjacent sides the respective thin metal plates are laminated with a single layer of coating sandwiched between them.

Description

PACKING PPRfl CYLINDER HEAD BACKGROUND OF THE INVENTION This invention relates to a cylinder head gasket interposed between a cylinder head and a cylinder block, particularly to a cylinder head gasket in which a plurality of thin metal plates are laminated. In the prior art, as a cylinder head gasket to be interposed between a cylinder head and a cylinder block, several cylinder head gaskets have been known using a single thin metal plate or a plurality of thin metal plates as shown in FIG. Figure 4 to Figure 6. Between such packages, in a cylinder head package in which the plurality of thin metal plates are laminated as shown in Figure 4 and Figure 5, the overall height of the package can be regulated. for cylinder head, a cylinder head and a cylinder block by means of a number of thin plates thereof, a member can be provided with extreme ease to enhance the sealing property in the holes for the combustion spaces and the holes of the fluids that perforate the packaging and in said holes, whereby the packaging has excellent advantages in comparison in a cylinder head gasket constituted by a Single thin plate described above. Furthermore, in the case in which a coating layer of a rubber or resin type material is provided on the contact surface of the previous package in which thin plates are laminated, the packing has an advantage that when applied a contact portion with a large load to the laminated thin plates, the thin sheets laminated by compression can be deformed because of this coating layer and the deformation of a cylinder head or a cylinder block can also be easily formed. In order to avoid friction and also for the purpose of improving the microsellation property, a coating layer is formed not only on the upper contact surfaces but also on the surface of a thin plate that has to make contact with a head of cylinder or a cylinder block. As such packaging in which thin metal plates have been laminated, a gasket has been known in which layers 12 of a rubber-like material coating are provided on the surfaces of the laminated thin plates 10 and 11 and on the contact surfaces of the same (Figure 4); a package in which a coating layer is not provided on the contact surfaces of the thin and laminated plates 13 to 18, the thin plates 13 to 18 are merely laminated, and a coating layer 19 of a material type is provided resin only on the surface of the outermost thin plate 13 (figure 5). However, when a rubber-like material is used for a coating layer, if a contact pressure is applied with a large load, the breakage or cladding of a coating layer occurs because of the flow. When resin material is used for a coating layer, there are problems that from the point of view of productivity, it is difficult to form a coating layer in order to have a desired thickness and a slip phenomenon is easily caused by the influence thermal Further, when a coating layer is not applied to the contact surface of a package in which thin plates have been laminated, there is a problem that thin plates can not be formed to the deformation of a cylinder head or a block of cylinder. In this way, functions such as packaging in which thin plates have been laminated can not be satisfied. On the other hand, in the prior art, a package is known in which a mixed material is used, ie a material containing a rubber material, a filler, an organic fiber, an inorganic fiber and the like in place of a rubber or resin type material to be used for the aforementioned coating layer. In the package, a coating layer is constituted by such mixed material, and as shown in Figure 6, layers 21 of coating the mixed material are provided on both surfaces of a single thin plate.

This packing has mechanical resistance and durability against breaking, peeling or sliding due to flow. However, the package does not contain the laminated thin plates so that it does not have the excellent advantages mentioned above that can be obtained by rolling.

BRIEF DESCRIPTION OF THE INVENTION It is an object of the present invention to provide a cylinder head gasket having sufficient mechanical strength and excellent durability while exhibiting advantages that can be obtained by laminating thin plates and providing coating layers on the contact surfaces of the laminated thin plates. Another object of the present invention is to provide a cylinder head gasket in which the overall height or thickness of the gasket is suppressed by means of changing the thickness of the coating layers provided on the thin plates depending on the members with which it is applied. they contact the coating layers, there is no mechanical coating phenomenon, even when a large load is applied, and the durability is improved. In order to achieve the above objectives of the present invention, the cylinder head gasket of the first embodiment of the present invention contains a plurality of thin metal plates each having at least one hole in the cylinder and holes for the passage of the fluid that they are laminated to form thin laminated plates; the surfaces of the more extreme thin plates of the thin laminated plates being coated with a mixed material, respectively; and coating the surface of at least one of the thin plates adjacent to each other of the thin plates laminated with the mixed material to form a coating layer, whereby the adjacent thin plates are laminated with the coating plate interspersed therein. same. Also, in order to achieve the above objectives of the present invention, the cylinder head gasket of another embodiment of the present invention contains a plurality of thin metal plates each having at least holes in the cylinder and holes for the passage of fluid that is laminated to make thin laminated plates; the surfaces of the thin outer plates of the thin plates laminated with a mixed material are coated, respectively; and coating the surface of at least one of the thin plates adjacent to each other of the thin plates laminated with the mixed material to form a coating layer, whereby the adjacent thin plates are laminated with the coating layer interspersed between the layers. same, in which each of the coating layers are formed on the surfaces of the outermost thin plates in order to be thicker than the coating layer formed between the adjacent thin plates. The cylinder head gasket of the second embodiment of the present invention contains the cylinder head gasket of the first embodiment, the other embodiment and the additional embodiment mentioned above, in which globules are formed which surround the holes for the passage of the fluid only on the intermediate thin plates except for the thinner outer plates between the thin plates that make up the thin laminated plates.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of a cylinder head gasket in accordance with the embodiment of the present invention. Figure 2 is a plan view of the packing of Figure 1. Figure 3a is an enlarged sectional view of a section fl-0 in Figure 2. Figure 3b and Figure 3c are each an enlarged sectional view. of section BB in the flat view of the package with the different modalities shown in figure 2. Figure 4 is a sectional view of a conventional cylinder head gasket in which thin metal plates are laminated.

Figure 5 is a sectional view for a conventional cylinder head gasket in which thin metal plates are laminated. Figure 6 is a sectional view of a conventional cylinder head gasket in which a conventional mixed material is coated. Figure 7 is a graph showing the pressure resistant characteristics of a mixed material of the present invention and a conventional mixed material.

DESCRIPTION OF THE PREFERRED MODALITIES As the thin metal plates, not only surface-treated steel plates are used, but also, for example, aluminum or stainless steel plates. The mixed material contains a rubber material such as nitrile rubber and chloroprene rubber, a filler such as graphite and mica, an inorganic fiber such as fiberglass and an organic fiber as a fiber p > aromatic oliamide and aromatic polyimide fiber. Thus, in the cylinder head gasket of the present invention, the total height of the cylinder head gasket, a cylinder head and a cylinder block can be adjusted; it can be provided in an extremely easy way or else prepare or enhance the sealing property; when contact pressure is applied, a high load, the laminated thin plates can be formed to the deformation of the cylinder head or a cylinder block because of the coating layers and neither do they break or peel the layers of the coating. coating due to thermal influence. In this manner, the cylinder head gasket of the present invention, both outermost thick coating layers contact the treated surfaces of a cylinder head and a cylinder block which are complementary members to absorb the roughness of the treated surfaces. , and the coating layers are prevented from forming to have an unnecessary thickness by making the adjacent thin plates with the coating layers which are thin but have a thickness sufficient to retain the pneumatic tightness between the plates, interleaved between them, with which the total height of the package itself can be suppressed, and even when a large load is applied, a mechanical sliding phenomenon is not caused. Some examples of the embodiment of the present invention are explained by referring to Figure 1 to Figure 3c. A cylinder head gasket 1 (abbreviated hereinafter "gasket 1") according to the first embodiment of the present invention must be interposed between a cylinder head 2 (abbreviated hereinafter as "head 2") and a cylinder block 3 (abbreviated hereinafter "block 3"). Figure 1 is a cross-sectional view thereof. Figure 2 is a plan view of the package 1; Figure 3a is an enlarged sectional view of a section fl-fl of the package 1 of Figure 2; and Figure 3b and Figure 3e are each seen in enlarged section of a section B-B of the package 1 of Figure 2 showing different modalities. The package 1 is formed by laminating three thin steel plates 4 to 6 treated superficially. On the outer surfaces of the thinner external plates 4 and 6 between the thin plates, ie on the sides of the surfaces contacting the head 2 and the block 3, the coating layers 7 having a desired thickness are coated. 70 to 200 μm of a mixed material, respectively. Also, on the back surfaces of the thin plates 4 and 6, ie, on the sides of the surfaces adjacent the thin plate 5, the coating layers 8 having a desired thickness of 60 to 100 jj thereof are provided. class of the previous mixed material, respectively. In Figure I, the above coating layers 7 are formed so that they have the same thickness as the coating layers 8. In this case, the thicknesses of the coating layers 7 and 8 must be selected differently in consideration not only of the accuracies of the surface roughness of these thin plates 4 to 6 themselves constituting the packing 1 and the superficial roughness of the head 2 and block 3 but also the conditions of use of packaging 1. In general, the thickness of the coating layers 7 is preferably 100 μm or more, and that of the coating layers 8 is preferably 100 μm or less. In Figure 1, the case in which the coating layers 7 having the same thickness on the outer surfaces of the thin plate 7 and the thin plate 6 are formed, but the present invention is not limited thereto. The coating layers 7 can be formed so that they are different in thickness depending on the surface roughness or something similar of the head 2 and the block 3. Also, the case in which the coating layers 8 are formed on the surfaces is illustrated. of the thin plates 4 and 6, but the present invention is not limited thereto. The coating layers 8 can be formed on both surfaces of the thin plates 5 instead of the back surfaces of the thin plates 4 and 6, or the coating layers 8 can be formed on the back surfaces of the plates 4 and 6 thin and both surfaces of the thin plate 5, respectively, so that the coating layers 8 have a total thickness of 60 μm or less. An example of the main constitutional components of the coating material used in the embodiment of the present invention is shown below.

Filler: preferably from 40 to 85% by weight, most preferably from about 60% by weight, based on the total weight of the mixed material, of one or more of kaolin, silica, mica and antigorite average particle size, preferably 1 50 μm, most preferably about 10 μrn Binder: preferably 5 to 30% by weight, most preferably about 20% by weight based on the total weight of the mixed material of nitrile rubber, butadiene-acrylonitrile rubber (NBR) or chloroprene rubber content of the acrylonitrile, preferably from 20 to 50% by weight, most preferably from approximately 33 to 35% by weight Fiber: preferably from 10 to 40% by weight, most preferably from approximately 20% by weight, based on the total weight of the material mixed one or more aromatic polyamide fiber, asbestos and rock wool. The package 1 as described above is constituted by laminated thin plates 4 to 6, whereby the total height of the package 1, the head can be adjusted 2 and block 3. Additionally, even when a large load is applied and the gasket 1 is interposed between the head 2 and the block 3, the coating layers 8 are provided on the contact surface of the laminated thin plates 4 and 5 and that of the laminated thin sheets 5 and 6 so that the package 1 can be formed to the deformation of the head 2 or the block 3. In addition, mixed material is used for the coating layers 7 and 8 so that the breaking or clamping of the coating layers 7 and 8 because of the flow and the sliding phenomenon is not caused by the thermal influence of the block 3 or something similar. In addition, the packing 1 prevents the coating layers 7 and the coating layers 8 from being formed so as not to form unnecessary thickness by absorbing the surface roughness of the surfaces contacting the complementary members between the layers. which is interposed the package 1, that is, the head 2 and the block 3 by the layers of 7 coating and retaining the pneumatic tightness between the thin plates 4 to 6 by means of the coating layers 8 which are thinner than the coating layers 7, whereby the total height of the package 1 itself can be suppressed; even when the large load is not applied, the mechanical phenomenon of sliding is not caused; and you get durability. As shown in figure 2, holes are drilled in the cylinder head gasket for the combustion space or holes for the passage of fluid, in order to prevent the escape of a combustion cable, cooling water or something similar, a member is generally provided to enhance the sealing property (e.g., a 0-ring and a mandrel) externally at the circumferential edges and the holes a and Ib.

Thus, in the package 1 of the present invention, in which thin metal plates are laminated, the aforementioned member can be provided extremely easily compared with a package constructed by a single thin plate described above. In the embodiment shown in Figure 3a in which the member is externally provided for enhancing the sealing property, along with the circumferential edge of the hole Ib for the passage of fluid that drills the laminated thin plates 4 to 6, a portion 5a is formed concave in the thin plate 5 which is an intermediate layer, with which a member 9 (composed of 9a and 9b) can be intertwined to achieve the desired property with the concave portion 5a. That is, the member 9 contains a ring 9a in the form of 0 made of rubber and a mandrel 9b for reinforcing the ring 9a which are integrally molded, and the mandrel 9b is intertwined with the concave portion 5a. In this way, the package 1 having mechanical strength and durability against breaking, peeling and sliding due to flow can be obtained in which the member 9 can be provided extremely easily to enhance the sealing property of the members. sealing holes for the combustion space or the holes Ib for the passage of fluid. A gasket 31 for the cylinder head according to the second embodiment of the present invention is also interposed between the cylinder head 2 and the cylinder block 3., and the flat shape thereof is the same as that shown in Figure 2. Figure 3b and Figure 3c are each an enlarged sectional view of a section BB of Figure 2. The packing 31 having a sectional construction shown in Figure 3b or Figure 3c is the same as the package of Figure 3a in that the package 31 is constructed by laminating three thin plates 4, 35a and 6 of steel and surface treated. However, the package 31 shown in Figure 3b or Figure 3c is different from the package of Figure 3 at the following points. That is, the package 1 of Figure 3a showing the first embodiment of the present invention has a construction that in order to prevent the escape of a combustion gas, cooling water or something similar, the member 9 is externally provided to enhance the sealing property, for example the 0-shaped ring 9a and the mandrel 9b at the circumferential edges of the plurality of holes for the combustion space or the plurality of holes Ib for the passage of the fluid. However, the external provision of the member 9 to enhance the sealing property requires additional procedural steps for such a provision. When a surface coating layer having a recent thickness can not be provided, as a method in which an externally provided sealing member is not used, there may be mentioned a conventional technique in which a portion 25 treated with beads is provided. In order to form a total sealing force on a portion contacting a complementary flange surface, as shown in FIGS. 4 and 5. In that case, there is a problem that the coating or abrasion of the coating layer occurs. coating in portion 25 treated with beads. Thus, in the second embodiment of the present invention, the globule treatment is applied based on an inventive finding whereby a coating layer of a surface contacting the complementary flange which has a recent thickness and also slims plus a coating layer of an intermediate contact surface to which the treatment with globules is to be applied, the necessary sealing force on the surface contacting the complementary flange can be formed by subjecting only the intermediate layer to the treatment with globules. Figure 3b shows an embodiment in which a portion 35b treated with beads is provided only in an intermediate layer 35a, and the coating layers 7 and 8 are provided on both surfaces of the outer thin plates 4 and 6. Figure 13 shows an embodiment in which a portion 35b treated with beads is provided only in the intermediate layer 35a, and the coating layers 8c are provided on both surfaces of the intermediate layer 35a. The embodiment in which the coating layers 8c are coated on both surfaces of the intermediate layer 35a illustrated in Figure 3 is not limited to such illustration, and the coating layer 8c may be provided on only either of the two surfaces of the coating. intermediate layer 35a, and a coating may be applied to a side that is oriented to the thin plate adjacent to a non-covering surface. In the embodiment of the present invention, the packaging 1 constituted by the lamination of the 3 thin steel plates 4 to 6 is explained, which is considered to be used more frequently from the viewpoints of productivity and costs. However, for practical purposes, four or more thin plates can be laminated depending on the conditions under which the packaging is used.

EXAMPLE On a surface of a steel plate treated on its surface, a mixed material is coated (commercial name 4840AH-2, available from As technika Corporation, Japan) with a dry thickness of 120 μm. The mixed material comprises 60% by weight of a filler composed of a mixture of silica, kaolin and mica (ie 20% by weight of silica, 30% by weight of kaolin and 10% by weight of mica); 20% by weight of a binder (butadiene-acrylonitrile rubber: content of acrylonitrile in the binder of 35% by weight) and 20% by weight of a fiber composed of a mixture of an aromatic polyamide fiber and rock wool with a weight ratio of 1: 1. Then, the same mixed material with a dry thickness of 80 μm is coated on the back surface of the previous steel plate. This steel plate coated on both surfaces is punctured with a punch press with a predetermined configuration to have cylinder holes and fluid passage holes. Separately, a stainless plate is prepared which is subjected to the same puncture treatment as mentioned above, and a portion of puncture holes that are subjected to the binding treatment. This steel plate with edging treatment is sandwiched between two sheets of the previous steel plates coated on both surfaces, so that the thicker coating layers of the respective steel plates coated on both surfaces are positioned on the outermost surface of the laminated plates for preparing a cylinder head gasket of the present invention. A ring 0 is fixed to a part of the puncture holes to obtain a final product. When this cylinder head gasket is prepared, it is adjusted for a car machine and the leakage of a material is examined from the holes, no leakage of water or oil is observed. The results of a test for comparing the pressure resistant characteristic (Curve A) of the above mixed material according to the present invention with the pressure resistant characteristic (Curve B) of a conventional mixed material are shown in Figure 7. Size of the test strips: 5 x 15 mm Pre-treatment conditions of the test strips: The test strips were immersed in a long-lasting coolant diluted with 50% of the tap water heated to 100 ° C for 1 hour. Method and Test: The test strips are placed on a plate of an Autograph DSS-25T (trade name) tester for material compression, produced by Shimazu Seisakusho and compressed by a compression base that has a size of approximately 30 nm in diameter. The compression speed was 0.5 mm per minute. As can be clearly seen from the curve of Figure 7, the mixed material of the present invention was able to withstand a compressive load exceeding 150 Megapascals (MPa) and allowed deformation of the thickness exceeding 30%. This compression point was the thickness deformation of less than 10%. The compression point is marked with "X" in Figure 7. According to the cylinder head gasket of the present invention, when contact pressure is applied at high load, the gasket can conform to the head deformation of the head. cylinder or a cylinder block due to the coating layers, no breakage or cladding of the coating layers occurs due to flow, and a deformation phenomenon is not caused by thermal influence. In addition, according to the cylinder head gasket of the present invention, the roughness of the processed surfaces of the counterpart members can be absorbed and the coating layers formed in such a way that the tightness between the thin plates can be retained , so that the total height of the packaging itself can be suppressed even when a high load is applied, a phenomenon of mechanical deformation of the coating layers does not occur and the durability is improved.

Claims (6)

NOVELTY OF THE INVENTION CLAIMS

1. A cylinder head gasket comprising: a plurality of thin metal plates each having at least cylindrical holes and fluid passage holes being laminated to form thin laminated plates; the surfaces of the outermost thin plates of the laminated thin plates being coated with mixed material, respectively; and the surface of at least one of the thin plates adjacent to one another of the laminated thin plates being coated with the mixed material to form a thin layer, whereby the adjacent thin plates are laminated with the coating layer sandwiched between the layers. same.

2. The package according to claim 1, further characterized in that the spheres surrounding the holes for fluid passage is formed only on the intermediate thin plates except for the thinner outer plates between the thin plates that make up the laminated thin plates .

3. A cylinder head gasket comprising: a plurality of thin metal plates each having at least cylindrical holes and fluid passage holes being laminated to form thin laminated plates; the surfaces of the outermost thin plates of the laminated thin plates being coated with mixed material, respectively; and the surface of at least one of the thin plates adjacent to one another of the laminated thin plates being coated with the mixed material to form a thin layer, whereby the adjacent thin plates are laminated with the coating layer sandwiched between the layers. same, wherein each of the coating layers on the surfaces of the outermost thin plates is formed to be thicker than the coating layer formed between the adjacent thin plates.

4. The package according to claim 3, further characterized in that the spheres surrounding the holes for fluid passage is formed only on the intermediate thin plates except for the thin outer plates between the thin plates that make up the thin plates laminated .

5. A cylinder head gasket comprising: a plurality of thin metal plates each having at least cylindrical holes and fluid passage holes being laminated to form thin laminated plates; the surfaces of the outermost thin plates of the laminated thin plates being coated with a mixed material, containing a fiber in addition to a binder and a filler, respectively; and the surface of at least one of the thin plates adjacent to one another of the laminated thin plates being coated with the mixed material to form a thin layer, whereby the adjacent thin plates are laminated with the coating layer sandwiched between the layers. same, wherein each of the coating layers on the surfaces of the outermost thin plates is formed to be thicker than the coating layer formed between the adjacent thin plates.

6. The package according to claim 5, further characterized in that the spheres surrounding the holes for fluid passage is formed only on the intermediate thin plates except for the thinner outer plates between the thin plates that make up the thin plates laminated .