JPH08145179A - Metal gasket - Google Patents

Abstract

PURPOSE: To provide a metal gasket which can be manufactured at low cost and is excellent in sealing property. CONSTITUTION: A metal gasket 10 is of a single plate structure or multiple-plate structure, and installed between a cylinder block and a cylinder head. Also a coating layer 30 is formed by pattern printing on one or both surfaces of a bead plate 11 and auxiliary plate according to a bead 16 and a stopper part 22.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a metal gasket having a coating layer.

[0002]

2. Description of the Related Art Generally, a metal gasket is widely used as a sealing means for sealing between a cylinder head and a cylinder block of an engine. The metal gasket has a single plate structure composed of only a bead plate or a multi-plate structure in which a plurality of bead plates and sub plates are laminated. Further, in order to further improve the sealing property between the cylinder head and the cylinder block, a coating layer provided on the surface of the bead plate or the surface of the sub plate has been put into practical use.

The coating layer is formed by spraying a coating material such as NBR rubber or fluorine rubber,
It is formed by coating, but when forming a coating layer, it is usually difficult to partially change the coating material or partially spray or form a non-coated portion. A coating layer made of the same material is formed over the entire surface of the plate or the sub plate.

By the way, a cooling water passage is formed between the metal gasket and the cylinder block on the outer peripheral side of the combustion chamber, and the coating layer is always exposed to the cooling water in the cooling water passage. Therefore, the peeling of the coating layer facing the cooling water passage is promoted, the peeled coating layer circulates with the cooling water, and the cooling part of the engine is reduced by clogging the pores of the thermostat and radiator. was there. Therefore, a metal gasket in which the coating layer facing the cooling water passage is mechanically removed in advance to prevent a decrease in cooling performance has been proposed and put into practical use.

[0005]

However, as described above, when the coating layer facing the cooling water passage is removed after forming the coating layer on the entire surface of the bead plate or the sub plate, the manufacturing process of the metal gasket is It becomes complicated and requires a lot of working time to remove the coating layer, and the amount of coating material required to manufacture one metal gasket is large, which increases the manufacturing cost of the metal gasket. There is a problem.

Further, since the coating layer made of the same material is formed on the entire surfaces of the bead plate and the sub-plate, the coating layer near the combustion chamber which seals the high temperature combustion gas and the cooling water under different conditions of use, for example, However, the materials of the coating layers near the oil holes that seal the cooling water and the lubricating oil are the same, and it is not possible to obtain the optimum sealing property according to the operating conditions.

An object of the present invention is to provide a metal gasket which can be manufactured at low cost and has excellent sealing property.

[0008]

A metal gasket according to claim 1 is a metal gasket having a multi-plate structure or a single plate structure mounted between two members, and a coating layer is formed on the metal gasket by pattern printing. It was formed.

Here, as described in claim 2, the characteristics of the coating layer are changed according to the sealing part, and as described in claim 3, the material of the coating layer is changed according to the sealing part. According to claim 4, the thickness of the coating layer is changed according to the sealing portion, and as described in claim 5, the thickness of the coating layer is gradually increased toward the bolt fastening portion side of the two members. The thickness of the coating layer at the site where high surface pressure is required is made thicker than other portions, as described in claim 6, or the coating is performed as described in claim 7. Changing the width of the layers depending on the sealing site is a preferred embodiment.

[0010]

In the metal gasket according to the present invention, a metal gasket having a double plate structure or a single plate structure having a coating layer formed by pattern printing is mounted between two members to seal between the two members. in this way,
When the coating layer is formed by pattern printing, it is possible to form the coating layer only on a portion that requires sealing, and it is also possible to easily form a coating layer having a complicated pattern.

Here, if the characteristics of the coating layer are changed according to the sealing portion, it becomes possible to further improve the sealing property and durability of the metal gasket. For example, if the material of the coating layer is changed according to the seal area, the metal gasket will have a coating layer of the material that meets the conditions such as heat resistance and wear resistance required for each seal area. And improve durability.

Further, if the thickness of the coating layer is changed according to the sealing portion, the surface pressure of the portion where the coating layer is thin becomes low and the surface pressure of the portion where the coating layer becomes thick becomes high. Can be adjusted to improve the sealing property. For example, if the thickness of the coating layer is reduced stepwise or continuously as it goes toward the bolt fastening portion side of the two members, the surface pressure of the metal gasket can be set uniformly and the sealing performance can be improved. If the thickness of the coating layer at the portion where high surface pressure is required is made thicker than other portions, the sealing property at that portion can be greatly improved.

Further, when the width of the coating layer is changed according to the sealing portion, the surface pressure becomes low in the wide part and the surface pressure becomes high in the narrow part. Therefore, the thickness was changed. Similar to the case, it is possible to improve the sealing property by adjusting the surface pressure of the metal gasket.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> This first embodiment is a case where the present invention is applied to a metal gasket mounted between a cylinder block and a cylinder head of a V-6 cylinder engine.

As shown in FIGS. 1 and 2, three cylinder holes 2 are formed in the left and right banks 1A and 1B of the cylinder block 1 of the V-type engine. Left and right bank 1
Eight bolt holes 3 are formed on the upper portions of A and 1B,
Cylinder heads 4 are fixed on the left and right banks 1A and 1B via cylinder head fixing bolts (not shown). Left and right cylinder heads 4 and left and right banks 1
Metal gaskets 10 are installed between A and 1B,
The metal gasket 10 maintains the airtightness and the liquidtightness between the cylinder head 4 and the cylinder block 1. A piston 5 is mounted in the cylinder hole 2 in a hermetically slidable manner via a plurality of piston rings 6, and a combustion chamber 7 is formed above the piston 5 in the cylinder hole 2. Although not shown in FIG. 1, the left and right banks 1
A plurality of lubricating oil passages and a plurality of cooling water passages are formed in A and 1B and the cylinder head 4, respectively.

Since the left and right metal gaskets 10 have basically the same structure, only the left one will be described. FIG.
As shown in FIG. 6, the metal gasket 10 has a substantially flat bead plate 1 having a coating layer 30 formed on the surface thereof.
The metal gasket 10 has a single-plate structure consisting of 1. The bead plate 11 is made of precipitation hardening type high silicon duplex stainless steel, SUS301 general material, SUS630 series or SU.
It is made of a stainless steel plate such as S631 precipitation hardening stainless steel.

The bead plate 11 is formed with three openings 12 and eight bolt insertion holes 13 corresponding to the cylinder hole 2 and the bolt hole 3, respectively, and also correspond to the lubricating oil passage and the cooling water passage. 6 oil holes 14 and a plurality of water holes 1
5 are formed respectively. However, the oil hole 14 and the water hole 15
The arrangement and the number of the above are appropriately set according to the arrangement and the number of the lubricating oil passages and the cooling water passages of the engine.

Further, the bead plate 11 includes three combustion chamber beads 16 that surround the opening 12, and five bolt / oil hole beads that collectively surround two adjacent bolt insertion holes 13 and oil holes 14. 17, three bolt hole beads 18 that surround only the bolt insertion hole 13, one oil hole bead 19 that surrounds only the oil hole, three combustion chamber beads 16, and water that surrounds the plurality of water holes 15. A hole bead 20 is formed.

Between the periphery of the opening 12 of the bead plate 11 and the bead 16 for the combustion chamber, a flat inner edge flat portion 21 is formed.
A stopper portion 22 formed along the peripheral edge of the inner edge flat portion 21 is provided on the upper side of the inner edge flat portion 21 by folding back and overlapping the peripheral edge portion of the opening 12 of the bead plate 11. On the outside of the bead 16 for the combustion chamber of the bead plate 11, a flat central flat portion 23 surrounded by the bead 20 for the water hole is formed.
An outer edge flat portion 24 is formed on the outer side of the outer surfaces 20 to 20.

The combustion chamber bead 16 is composed of an arcuate bead protruding toward the cylinder head 4, the beads 17 to 20 other than the combustion chamber bead 16 are composed of a stepped bead, and the inner edge flat portion 21 and the center are formed. The flat portion 23 is arranged on the cylinder block 1 side, and the outer edge flat portion 24 is arranged on the cylinder head 4 side. The plurality of water holes 15 are in the central flat portion 2.
3, the cooling water is filled between the central flat portion 23 and the cylinder head 4.

Next, the structure of the coating layer 30 will be described. As shown in FIGS. 4 to 6, the coating layer 30 is formed by pattern printing on the upper and lower surfaces of the bead plate 11 along the beads 16 to 20, and is not formed on other portions. The pattern printing means letterpress printing, planographic printing, intaglio printing, screen printing, flocking printing,
Printing technology such as magnetic printing and hot stamping,
It includes a material application technique using a dispenser.

The coating layer 31 formed on the upper and lower sides of the combustion chamber bead 16 of the coating layer 30 is a coating material excellent in heat resistance and wear resistance because it seals high-temperature combustion gas and cooling water. The other coating layer 32 is made of a coating material excellent in liquid-tightness and abrasion resistance in order to seal the lubricating oil and the cooling water. However, the coating layer 32 is
It may be divided into a plurality of regions according to the use conditions, and each region may be composed of a coating layer having a different coating material. Alternatively, the entire coating layer 30 may be made of one type of coating material.

The coating materials for the coating layers 31, 32 are fluororubber, NBR rubber, SBR rubber,
Synthetic rubber materials such as silicone rubber, epoxy resin,
Silicon resin, phenol resin, urethane resin,
Synthetic resin materials such as polyimide resin, vinyl chloride resin, acrylic resin, polyurethane resin, ABS resin, and PTFE (tetrafluoroethylene) resin, and aluminum alloys and copper for these synthetic rubber materials and synthetic resin materials. ,
It is possible to use a composite material in which metal powder such as brass or stainless steel, glass powder or glass fiber, ceramic powder or ceramic fiber, molybdenum disulfide powder or the like is mixed, and it is appropriately selected according to usage conditions.

Next, the operation of the metal gasket 10 will be described. With the metal gasket 10 mounted between the cylinder block 1 and the cylinder head 4, by fastening the cylinder head 4 to the cylinder block 1 with eight cylinder head fixing bolts, the cylinder block 1
The metal gasket 10 is assembled between the cylinder head 4 and the cylinder head 4. Then, in this state, a gap corresponding to the thickness of the stopper portion 22 is formed in the vicinity of the combustion chamber bead 16, and abnormal displacement of the combustion chamber bead 16 at the time of bolt fastening is restricted.

On the other hand, the upper and lower coating layers 31 corresponding to the combustion chamber beads 16 are brought into pressure contact with the lower surface of the cylinder head 4 and the upper surface of the cylinder block 1, whereby the combustion chamber 7
The airtightness of is maintained. Also, bead 17 for bolts and oil holes
And the upper and lower coating layers 3 corresponding to the oil hole beads 19
2 are pressed against the lower surface of the cylinder head 4 and the upper surface of the cylinder block 1, respectively, and the lubricating oil and the cooling water are partitioned in a liquid-tight state. Further, the coating layers 32 above and below the bead 18 for bolt holes and the bead 20 for water holes are formed by the cylinder head 4
Is pressed against the lower surface of the cylinder block 1 and the upper surface of the cylinder block 1 to separate the cooling water and the external space.

By the way, the cooling water also flows into the gap between the central flat portion 23 and the cylinder head 4, but since the coating layer 30 is not formed on the central flat portion 23, the cooling water of the coating layer 30 is not formed. It is possible to prevent problems such as deterioration of cooling performance due to peeling. In addition, the coating layer 30 is formed only on the portion that needs to be sealed.
Since the metal gasket 10 is formed, the amount of coating material used can be reduced as much as possible, and the manufacturing cost of the metal gasket 10 can be reduced.

Furthermore, since the coating layer 30 is formed by pattern printing, the coating layer 30 can be easily formed without complicating the manufacturing process of the metal gasket 10.
Can be formed. Moreover, since the material of the coating layer 30 is changed according to the usage conditions of the portion to be sealed, the sealing performance of the metal gasket 10 can be significantly improved.

Here, a modification in which the structure of the metal gasket 10 is partially changed will be described. 1) The film thickness of the coating layer 30 may be set stepwise or continuously thicker as it goes away from the bolt insertion hole 13. In this case, the surface pressure of the metal gasket 10 with respect to the cylinder head 4 and the cylinder block 1 can be set uniformly to improve the sealing performance.

2) The width of the coating layer 30 may be set narrower stepwise or continuously as it goes away from the bolt insertion hole 13. In this case, the metal gasket 1 for the cylinder head 4 and the cylinder block 1
It is possible to improve the sealing property by uniformly setting the surface pressure of 0. 3) The thickness of the coating layer 31 around the combustion chamber may be set thicker than the thickness of the other coating layers 32. In this case, the airtightness around the combustion chamber can be set higher than that of the other parts. 4) As shown in FIG. 7, the coating layer 34 may be formed on the entire surface of the bead plate 11, and the coating layer 31 may be formed on a required portion of the surface of the coating layer 34 by pattern printing. However, in this case, although not shown, the coating layer 32 is also formed by pattern printing on a necessary portion of the surface of the coating layer 34, like the coating layer 31. 5) As the upper and lower coating layers 31 of the bead plate 11,
As shown in FIG. 8, the coating layers 31 having different patterns may be formed. However, although not shown, the upper and lower coating layers 32 of the bead plate 11 may also be formed of the coating layers 32 having different patterns, like the coating layer 31.

Next, the metal gaskets 40 to 42 having a multi-plate structure, which are composed of a sub plate 44 such as a spacer plate and a stopper plate and a bead plate 45, will be described with reference to FIGS.
Will be described with reference to. Metal gasket 40-42
The bead plate 45 used in 1. omits the stopper portion 22 of the bead plate 11, and the same members as those of the bead plate 11 are denoted by the same reference numerals and detailed description thereof will be omitted. The sub-plate 44 is made of a flat metal thin plate, and like the bead 11, has three openings, eight bolt insertion holes, six oil holes, and a plurality of water holes. A stopper portion 46 is formed by folding back.

A metal gasket 40 shown in FIG. 9 is a metal gasket having a two-piece structure in which a sub-plate 44 is superposed on the lower side of the bead plate 45. The combustion chamber bead 16 of the bead plate 45 is attached to the sub-plate 44 side. Is provided in a protruding shape, and the folded-back portion 46 of the sub-plate 44 is folded back toward the bead plate 45. The coating layer 30 is formed in the illustrated region, and is also formed on the upper and lower surfaces of the bead plate 45 and the sub plate 44 corresponding to the beads 17 to 20, respectively, although not shown.

The metal gasket 41 shown in FIG. 10 includes a sub plate 47 and a sub plate 4 in which the stopper portion 46 of the sub plate 44 is omitted.
4 is provided above and below and a bead plate 45 is provided between both sub plates 44 and 47. This is a metal gasket having a three-piece structure. The combustion chamber beads 16 of the bead plate 45 are provided in a protruding shape toward the sub plate 44 side. The stopper portion 46 of 44 is folded back to the bead plate 45 side. The coating layer 30 is formed at the position shown in the drawing, and is also formed on both upper and lower surfaces of both the sub plates 44 corresponding to the beads 17 to 20, though not shown.

The metal gasket 42 shown in FIG. 11 has bead plates 45 provided on the upper and lower sides, and a sub plate 44 is provided between the bead plates 45.
A metal gasket with a three-piece structure that has two bead plates 4
5, the bead 16 for the combustion chamber is provided in a protruding shape toward the sub plate 44 side,
The stopper portion 46 of the sub plate 44 is folded back downward. The coating layer 30 is formed at the position shown in the drawing, and although not shown, the upper and lower surfaces of the sub-plate 44 corresponding to the beads 17 to 20, the upper surface of the upper bead plate 45, and the lower bead are supported. It is also formed on the lower surface of the plate 45, respectively. In this metal gasket 42, the coating layer 30 may be formed in the region shown in FIG. 12, and in this case, although not shown, the beads 17 to 2 are formed.
The coating layers 30 are formed on the upper and lower surfaces of the upper and lower bead plates 45 corresponding to 0, respectively.

Also in the metal gaskets 40 to 42, it is possible to partially change the width and thickness of the coating layer 30 as in the modification of the metal gasket 10 described above. Further, the coating layer 30 can be arranged in a pattern other than that shown in the figure, and is appropriately set according to the usage conditions and the like. Furthermore, the bead plate 45
The positional relationship between the sub-plates 44 and 47 can be set to an array other than that described above, and the present invention can be similarly applied to a metal gasket having a structure of four or more sheets. is there.

In the first embodiment, the present invention is applied to the metal gaskets 10, 40 to 42 mounted on the cylinder block 1 and the cylinder head 4 of a V6 cylinder engine. The present invention can be similarly applied to a cylinder engine, a single cylinder engine, and an in-line multi-cylinder engine. Further, the present invention can be similarly applied to a metal gasket such as a compressor or an air pump including the cylinder block 1 and the cylinder head 4.

<Second Embodiment> This second embodiment is a V type 6
This is a case where the present invention is applied to a metal gasket mounted between the cylinder head 4 of a cylinder engine and an intake manifold. As shown in FIGS. 1 and 13, a cylinder head 4 is provided on the left and right banks 1A and 1B of the V-type engine, and three intake ports 8 and seven bolt fastening holes are provided on a side wall of the cylinder head 4. 9 and EGR not shown
(Exhaust gas recirculation) passage and cooling water passage are opened respectively.

The cylinder head 4 has three intake ports 8
An intake manifold 51 having three intake branch pipes 50 connected to each other is fixed, a flange member 52 is provided at a downstream end of the intake manifold 51, and three intake branches are provided between the flange member 52 and a side wall of the cylinder head 4. A metal gasket 60 that connects the pipe 50 and the three intake ports 8 in an airtight manner is mounted, and the metal gasket 60 is fixed to the cylinder head 4 together with the intake manifold 51 via seven bolts 53.

As shown in FIGS. 14 and 15, the metal gasket 60 is composed of a bead plate 61 made of an elastic metal plate having a coating layer 70 formed on the surface thereof. The bead plate 61 is a cylinder head of the flange member 52. The bead plate 61 is formed in substantially the same shape as the mating surface on the fourth side, and has three intake ports 8 and seven bolt fastening holes 9 and three openings 62 and seven holes corresponding to the EGR passage and the cooling water passage, respectively. A bolt insertion hole 63, a gas hole 64, and a water hole 65 are formed respectively, and a bead plate 61 surrounds the port bead 66 surrounding the opening 62, the EGR gas hole bead 67 surrounding the gas hole 64, and the water hole 65. A water hole bead 68 is formed.

As shown in FIGS. 14 and 15, the coating layer 70 has beads 66 to 6 on both front and rear surfaces of the bead plate 61.
8 is formed by pattern printing as in the first embodiment. The coating layers 71 formed on the front and rear surfaces of the port bead 66 are made of a coating material having excellent fuel resistance, oil resistance, and abrasion resistance in order to seal gas containing fuel and blow bio-oil. The coating layers 72 formed on the front and rear surfaces of the EGR gas hole bead 67 are made of a coating material having excellent heat resistance, airtightness and wear resistance in order to seal high temperature EGR gas. The coating layers 73 formed on the front and rear surfaces of the bead 68 are made of a coating material having excellent heat resistance, watertightness, and wear resistance. However, the coating material as disclosed in the first embodiment can be used as the coating material.

With the metal gasket 60 for the intake manifold 51, the same operation as in the first embodiment can be obtained. Further, similarly to the modification of the first embodiment, the film thickness and width of the coating layer 70 can be changed according to the portion to be sealed.

In the second embodiment, the present invention is applied to the metal gasket 60 having a single plate structure, which is mounted between the cylinder head 4 and the intake manifold 51 of a V type 6 cylinder engine. The present invention can be similarly applied to a metal gasket having a single-plate structure or a double-plate structure mounted between a cylinder head and an intake manifold of a multi-cylinder engine, a single-cylinder engine, or an in-line multi-cylinder engine. Further, the present invention can be similarly applied to a metal gasket mounted between the cylinder head 4 and the exhaust manifold.

Further, in this embodiment, the cylinder block 1
Metal gasket 1 installed between the cylinder and the cylinder head 4
The present invention has been applied to the metal gasket 60 mounted between the cylinder head 4 and the intake manifold 51, but the metal gasket mounted between the two members is not limited to the engine. The present invention can be similarly applied to a metal gasket of a device.

[0043]

In the metal gasket according to the present invention, since the coating layer is formed on the metal gasket by pattern printing, it becomes possible to form the coating layer only on the portion where sealing is required, and the sealing property is improved. It is possible to reduce the manufacturing cost of the metal gasket by minimizing the amount of the coating material used while ensuring the sufficient amount. Also, since the coating layer is not formed on the unnecessary part, the work for removing the unnecessary coating layer is not required, which can improve the productivity of the metal gasket and complicate the metal gasket production line. Absent. Further, since a coating layer having a complicated pattern can be easily formed, a coating layer can be easily formed even on an engine head gasket having a plurality of combustion chamber holes, hydraulic pressure, water holes, bolt holes, etc. You can

Here, if the characteristics of the coating layer are changed according to the sealing portion, the sealing property and durability of the metal gasket can be further improved. For example, if the material of the coating layer is changed according to the seal area, the metal gasket will have a coating layer of the material that meets the conditions such as heat resistance and wear resistance required for each seal area. The durability and durability can be improved.

Further, if the thickness of the coating layer is changed according to the sealing portion, the surface pressure of the portion where the coating layer is thin becomes low and the surface pressure of the portion where the coating layer becomes thick becomes high. Can be adjusted to improve the sealing property. For example, if the thickness of the coating layer is reduced stepwise or continuously as it goes toward the bolt fastening portion side of the two members, the surface pressure of the metal gasket can be set uniformly and the sealing performance can be improved. If the thickness of the coating layer at the portion where high surface pressure is required is made thicker than other portions, the sealing property at that portion can be greatly improved.

Further, when the width of the coating layer is changed according to the sealing portion, the surface pressure becomes low in the wide part and the surface pressure becomes high in the narrow part. Therefore, the thickness was changed. Similar to the case, it is possible to improve the sealing property by adjusting the surface pressure of the metal gasket.

[Brief description of drawings]

FIG. 1 is a perspective view of a cylinder block.

FIG. 2 is a vertical cross-sectional view of the main part near the combustion chamber

FIG. 3 is a plan view of a bead plate.

FIG. 4 is a plan view of the metal gasket.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a vertical cross-sectional view around a bead of a metal gasket having another structure.

FIG. 8 is a vertical cross-sectional view around a bead of a metal gasket having another structure.

FIG. 9 is a vertical cross-sectional view of a main part of a metal gasket having a two-sheet structure.

FIG. 10 is a vertical cross-sectional view of a main part of a three-piece metal gasket.

FIG. 11 is a vertical cross-sectional view of an essential part of another three-piece metal gasket.

FIG. 12 is a vertical cross-sectional view of an essential part of another three-piece metal gasket.

FIG. 13 is a vertical cross-sectional view of main parts of a cylinder head and an intake manifold.

FIG. 14 is a front view of a metal gasket for an intake manifold.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

1 cylinder block 1A bank 1B bank 2 cylinder hole 3 bolt hole 4 cylinder head 5 piston 6 piston ring 7 combustion chamber 8 intake port 9 bolt fastening hole 10 metal gasket 11 bead plate 12 opening 13 bolt insertion hole 14 oil hole 15 water hole 16 Beads for Combustion Chamber 17 Beads for Oil Hole 18 Beads for Bolt Hole 19 Beads for Oil Hole 20 Beads for Water Hole 21 Inner Edge Flat Part 22 Stopper Part 23 Center Flat Part 24 Outer Edge Flat Part 30 Coating Layer 31 Coating Layer 32 Coating Layer 34 Coating layer 40 Metal gasket 41 Metal gasket 42 Metal gasket 44 Sub plate 45 Bead plate 46 Stopper part 47 Sub plate 50 Intake branch pipe 51 Intake manifold 52 Flange member 53 Bolt 60 Metal gasket Bead 67 EGR for 1 bead plate 62 opening 63 bolt insertion hole 64 gas holes 65 water holes 66 ports
Beads for gas holes 68 Beads for water holes 70 Coating layer 71 Coating layer 72 Coating layer 73 Coating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Yamato 2-6-5, running, Toyonaka-shi, Osaka Prefecture Domestic production part product industry (72) Inventor Yoshitaka Abe 2-6-5, running, Toyonaka-shi, Osaka Domestic Products Industry Co., Ltd.

Claims (7)

[Claims] 1. A metal gasket having a double plate structure or a single plate structure, which is mounted between two members, wherein a coating layer is formed on the metal gasket by pattern printing. 2. The metal gasket according to claim 1, wherein the characteristics of the coating layer are changed according to the sealing portion. 3. The metal gasket according to claim 1, wherein the material of the coating layer is changed according to the sealing portion. 4. The metal gasket according to claim 1, wherein the thickness of the coating layer is changed according to the sealing portion. 5. The metal gasket according to any one of claims 1 to 4, wherein the thickness of the coating layer is gradually or continuously reduced toward the bolt fastening portion side of the two members. 6. The metal gasket according to claim 1, wherein the thickness of the coating layer at the portion where high surface pressure is required is thicker than the other portions. 7. The metal gasket according to claim 1, wherein the width of the coating layer is changed according to the sealing portion.