JP2008223917A - Metal gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal gasket formed by a laminate of a plurality of metal base plates which is easy to handle since the surfaces thereof are not damaged each other even though stacked and packed while materializing excellent durability and assembly characteristic. <P>SOLUTION: In a metal gasket 10 equipped with a pair of metal base plates 12, 12 and an intermediate plate 14 interposed amidst a pair of metal base plates 12, 12, at least one of a pair of metal base plates 12, 12 has a recess 30 projecting to the intermediate plate 14 side, wherein the bottom 32 of the recess 30 is welded. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal gasket formed by laminating a plurality of metal substrates, and more particularly, to a metal gasket interposed in a joint surface between a cylinder head and a cylinder block of an engine.

  Metal gaskets installed at the joint between the cylinder block and cylinder head that make up the engine are required for high-pressure combustion gas generated in the cylinder, cooling water and lubricating oil flowing between the cylinder block and the cylinder head, etc. In order to satisfy various sealing performances, a metal cylinder head gasket in which a plurality of metal substrates are stacked is used.

  In such a metal gasket, in order to position and fix each metal substrate at a predetermined position, for example, after forming a concave portion by punching press processing using a punch die, press bonding is performed by pressing, or, A plurality of metal substrates stacked by spot welding are combined (for example, see Patent Documents 1 to 3).

  However, in the case of caulking, there is a problem that the metal substrate has to be partially cut, and is easily fatigued by vibrations or the like generated during engine operation, and cracks are likely to occur from the cut portion. In addition, protrusions are generated on the surface of the metal gasket due to caulking, so if the metal gaskets are stacked during packing, the protrusions may come into contact with the surface of the metal gasket and be damaged, and it is difficult to carry the bulky material. Become. In addition, since a protrusion is generated on the surface of the metal gasket, the caulking coupling position must be set at a position where it does not interfere with the cylinder block and the cylinder head, and the layout of the metal gasket is restricted.

In addition, in the case of bonding by spot welding, it is not necessary to cut the metal substrate partially and deterioration due to metal fatigue is less likely to occur, but the metal gasket is likely to warp due to welding, and the assembling characteristics with the cylinder block and cylinder head deteriorate. In addition, there is a possibility that welding marks remain on the surface of the metal gasket, and protrusions are generated on the surface. Therefore, as in the case of caulking, there is a problem that the welding position must be set at a position that does not interfere with the cylinder block and the cylinder head.
JP-A-8-42696 JP 2001-336638 A JP-A-8-200504

  The present invention has been made in view of the above problems, and in a metal gasket formed by bonding a plurality of laminated metal substrates, it is easy to lay out the bonding positions on the metal substrate, and the surface is damaged even when stacked and packed. Another object of the present invention is to provide a metal gasket excellent in durability and assembly characteristics.

  The metal gasket of the present invention is a metal gasket comprising a pair of metal substrates and an intermediate plate interposed between the pair of metal substrates, wherein at least one of the metal substrates is the intermediate plate. It has the recessed part which protrudes to the side, and is welded in the bottom part of the said recessed part, It is characterized by the above-mentioned.

  In the above-described present invention, the bottom portion of the concave portion may be in contact with the opposing metal substrate through a through hole provided in the intermediate plate, and the welding may be spot welding.

  According to the present invention, the bottoms of the recesses provided in the pair of metal substrates are welded together, so that deterioration due to metal fatigue is less likely to occur, and even if welding marks occur due to welding, there is no protrusion from the metal substrate surface. , The degree of freedom of layout is increased, and even if stacked and packed, the surfaces are not damaged. In addition, since the recesses relieve the distortion that occurs during welding, the metal gasket itself is less likely to warp, and the assembly characteristics of the metal gasket are excellent.

  According to the present invention, it is easy to layout the bonding positions on the metal substrate, and even when stacked and packaged, the surfaces are not damaged, and a metal gasket excellent in durability and assembly characteristics can be obtained.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a metal gasket 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 with the metal gasket 10 interposed between a cylinder head 2 and a cylinder block 3. FIG. 3 is a cross-sectional view corresponding to the cross section, and FIG. 3 is a cross-sectional view taken along the line BB of FIG.

  As shown in FIGS. 1 and 2, the metal gasket 10 of the present embodiment is a cylinder head gasket that is interposed in a joint surface between a cylinder head 2 and a cylinder block 3 in a multi-cylinder engine and seals the joint surface. A pair of bead plates 12 and 12 and an intermediate plate 14 interposed therebetween are provided.

  The pair of bead plates 12 and 12, for example, after punching a metal material such as SUS301 or SUS304 and performing folding processing, bead processing, heat treatment, or the like as necessary, a coating layer 16 such as heat-resistant rubber is provided on the surface. It is formed excluding the recessed portion 30 to be formed.

  A pair of bead plates 12, 12 are formed with cylinder holes 18 corresponding to the cylinder bores 4 formed in the cylinder head 2 and the cylinder block 3, respectively. A plurality of cooling water holes 20 are provided at positions corresponding to the water jacket, and further, a bolt hole 22 through which a tightening bolt is inserted, a lubricating oil hole 24 through which lubricating oil is passed, and the like are provided.

  An annular bead portion 26 is formed around each cylinder hole 18 of the bead plate 12 so as to be separated from the intermediate plate 14, and surrounds each annular bead portion 26 and the cooling water hole 20. An outer peripheral bead portion 28 is formed on the outer periphery.

  The intermediate plate 14 includes a first intermediate plate 14a interposed in a region inside the outer peripheral bead portion 28, and a second intermediate plate 14b interposed in the vicinity of the periphery of the cylinder hole 18, for example, SUS301 or A metal material made of SUS304, SECC or the like is punched out and formed into a predetermined shape, and subjected to folding processing, heat treatment, heat-resistant rubber coating treatment, or the like as necessary.

  The pair of bead plates 12 and 12 and the intermediate plate 14 constituting the metal gasket 10 are coupled and fixed in a stacked state by welding the concave portions 30 formed in the pair of bead plates 12 and 12. .

  Specifically, the pair of bead plates 12 and 12 are respectively formed with recesses 30 that protrude toward the intermediate plate 14 and are recessed toward the inside of the metal gasket 10 at positions facing each other.

  As shown in FIG. 2, in the recess 30 a formed in a region where the first intermediate plate 14 a and the second intermediate plate 14 b are not interposed between the pair of bead plates 12, 12 such as the peripheral portion of the metal gasket 10, The bottom 32 of the recess 30a directly contacts and is welded by a welding method such as spot welding. On the other hand, as shown in FIG. 3, in the recess 30b formed in the region where the first intermediate plate 14a and the second intermediate plate 14b are interposed between the pair of bead plates 12, 12 such as the peripheral portion of the metal gasket 10, The intermediate plate 14b and the bottom portion 32 of the concave portion 30b are in contact with each other through a through hole 34 provided in the intermediate plate 14a corresponding to the concave portion 30b, and are welded by a welding method such as spot welding.

  As described above, since the metal gasket 10 according to the present embodiment is welded at the bottom portion 32 of the recess 30 formed in the pair of bead plates 12, 12, distortion generated during welding can be reduced in the recess 30. In addition, the metal gasket 10 itself is less likely to warp and has excellent assembling characteristics when it is interposed between the joint surfaces of the cylinder head 2 and the cylinder block 3.

  Moreover, since the recessed part 30 is depressed toward the inner side of the metal gasket 10, even if a welding mark is generated by welding, it does not affect the joining surface of the cylinder head 2 and the cylinder block 3 and the degree of freedom of the welding position. In addition, the surface is not damaged even when stacked and packed.

  In the metal gasket 10 of the present embodiment, the recess 30b formed in the region where the first intermediate plate 14a and the second intermediate plate 14b are interposed between the pair of bead plates 12 and 12 penetrates only the intermediate plate 14a. Although the hole 34 is provided and the bottom 32 and the intermediate plate 14b are integrally welded, the present invention is not limited to this. For example, as shown in FIG. 4A, through holes are provided in both the intermediate plates 14a and 14b. The bottom portions 32 may be directly brought into contact with each other and welded.

  Moreover, although the recessed part 30 was provided in each of a pair of bead plates 12 and 12, as shown to FIG.4 (b) (c), you may provide the recessed part 30 only in any one bead board 12. FIG.

It is a top view of the metal gasket which concerns on one Embodiment of this invention. It is a figure equivalent to the AA cross section of FIG. 1 in the state interposed between the cylinder head and the cylinder block. It is BB sectional drawing of FIG. (A)-(c) is the elements on larger scale of the metal gasket which concerns on the example of a change of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Metal gasket 12 ... Bead plate 14 ... Intermediate plate 16 ... Coating layer 18 ... Cylinder hole 20 ... Cooling water hole 22 ... Bolt hole 24 ... Lubricating oil hole 26 ... Annular bead part 28 ... Outer periphery bead part 30 ... Recess 32 ... Bottom part 34 ... through hole

Claims (4)

In a metal gasket comprising a pair of metal substrates and an intermediate plate interposed between the pair of metal substrates,
The metal gasket according to claim 1, wherein at least one of the metal substrates has a recess that protrudes toward the intermediate plate, and is welded at a bottom of the recess.   2. The metal gasket according to claim 1, wherein a bottom portion of the concave portion is in contact with an opposing metal substrate through a through hole provided in the intermediate plate.   The metal gasket according to claim 1 or 2, wherein the welding is spot welding.   The metal gasket according to any one of claims 1 to 3, wherein the pair of metal substrates are bead plates each having a cylinder hole corresponding to a cylinder bore and a bead surrounding the cylinder hole.

Images