JP2007120350A - Metal gasket for cylinder head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set even a little step height for properly keeping a bearing pressure balance between an annular bead and an outer peripheral bead. <P>SOLUTION: This metal gasket for a multilayered cylinder head has a cylinder hole 2a, the annular bead 2b formed on its periphery, a cooling water hole 2c formed in its outside peripheral part and two base boards 2 having these annular bead and outer peripheral bead formed in a position for surrounding the cooling water hole. A claw-shaped projection possessed by an outside step height adjusting plate extending up to a position of the outer peripheral edge of the base boards from a position of a cooling water jacket, is inserted into a hooking hole possessed by an inside step height adjusting plate thicker than its outside step height adjusting plate and extending up to the position of the cooling water jacket from an inside position of the annular bead of the base boards between these two base boards, and a material of connecting these outside step height adjusting plate and inside step height adjusting plate is interposed by folding back a projecting part from its hooking hole, and the lower side base board is provided with a claw-shaped projection releasing recessed part turning to its claw-shaped projection by aligning in the thickness direction of a gasket to the claw-shaped projection. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylinder head metal gasket inserted between a cylinder block and a cylinder head of an internal combustion engine.

  As this type of metal gasket, for example, the one described in Patent Document 1 is known. Each cylinder head metal gasket is made of a metal plate and formed corresponding to each cylinder bore of a cylinder block of an internal combustion engine. Cylinder holes, an annular bead having a chevron-shaped cross section formed around each cylinder hole, and an outer peripheral portion of each annular bead corresponding to the cooling water jacket of the cylinder block and the cooling water hole of the cylinder head. Two substrates having a formed cooling water hole, and an outer peripheral bead having a one-sided cross-sectional shape formed at a position entirely surrounding the annular bead and the cooling water hole are provided. A thin step adjustment plate made of a metal plate is interposed between the substrates.

The step adjusting plate extends from the position inside the annular bead of the substrate to the position of the cooling water jacket, and has a claw-shaped protrusion, and the claw-shaped protrusion is one of the two sheets. By inserting into the cooling water hole of the substrate and turning back the protruding part from the cooling water hole, the surface pressure applied to the annular bead of the substrate is increased by being connected to one of the substrates, and against the combustion gas in the cylinder bore The sealing performance is improved.
Japanese Patent Laid-Open No. 2003-287137, FIG.

  However, in the conventional metal gasket, the step between the annular bead of the substrate and the outer peripheral bead, that is, the annular bead, only by the thickness of the step adjusting plate extending from the position inside the annular bead of the substrate to the position of the cooling water jacket, Since the surface pressure is adjusted, the lower limit of the adjustment is limited to the lower limit of the available plate thickness of the metal plate, and fine adjustment of the step to make the surface pressure balance between the annular bead and the outer peripheral bead appropriate. There was a problem that it was not possible.

  The present invention aims to solve the above-mentioned problem advantageously, and the cylinder head metal gasket according to claim 1 is made of a metal plate and is a cylinder to which a cylinder head of an internal combustion engine is assembled. A cylinder hole formed corresponding to each cylinder bore of the block, an annular bead having an angled cross section formed around each cylinder hole, a cooling water jacket of the cylinder block, and a cooling water hole of the cylinder head Correspondingly, it has a cooling water hole formed in the outer peripheral portion of each annular bead, and an outer peripheral bead having a single bevel-shaped cross section formed at a position surrounding the annular bead and the cooling water hole as a whole. Comprising two substrates, wherein the annular beads of the two substrates are aligned with each other in the thickness direction of the gasket; In the laminated type cylinder head metal gasket, it is made of a metal plate, and extends from the position of the cooling water jacket to the position of the outer peripheral edge of the substrate, and a metal plate thicker than the outer step adjustment plate. Nail-like projections of one of the inner step adjustment plate extending from the position inside the annular bead of the substrate to the position of the cooling water jacket, the outer step adjustment plate and the inner step adjustment plate The other step adjustment plate and the inner step adjustment plate are connected by inserting the outer step adjustment plate and the inner step adjustment plate by folding back the protruding portion from the engagement hole. The claw-like projections inserted between the two holes and inserted into the hooking holes on at least one of the two substrates are aligned in the thickness direction of the gasket. Is characterized in that located provided with claw-like projections relief recesses facing the claw-like projection with.

  According to a second aspect of the present invention, there is provided a metal gasket for a cylinder head according to the present invention, wherein the cylinder hole is made of a metal plate and is formed corresponding to each cylinder bore of a cylinder block to which a cylinder head of an internal combustion engine is assembled. An annular bead having a chevron cross-sectional shape formed around the hole, and a cooling water hole formed in the outer peripheral portion of each annular bead corresponding to the cooling water jacket of the cylinder block and the cooling water hole of the cylinder head, A metal gasket for a laminated cylinder head comprising a single substrate having a single bevel-shaped outer peripheral bead formed at a position surrounding the annular bead and the cooling water hole as a whole. An outer step adjustment extending from the position of the cooling water jacket to the position of the outer peripheral edge of the substrate. And a claw-like protrusion which one of the inner step adjustment plate which is made of a metal plate thicker than the outer step adjustment plate and extends from the position inside the annular bead of the substrate to the position of the cooling water jacket has The outer step adjusting plate and the inner step adjusting plate are connected to each other by inserting into the engaging hole of the other of the outer step adjusting plate and the inner step adjusting plate and folding back the protruding portion from the engaging hole. The outer step adjustment plate and the inner step adjustment plate are overlaid on the substrate, and are aligned with the claw-like protrusions inserted into the hooking holes and folded back on the substrate in the thickness direction of the gasket. And a claw-like protrusion escape recess that faces the claw-like protrusion.

  In the metal gasket for a cylinder head according to claim 1, in the three-layered cylinder head metal gasket, an outer step adjustment plate positioned between two substrates and an inner step adjustment that is thicker than the outer step adjustment plate. The plates are connected to each other by the engagement of the claw-like projections and the engagement holes that one and the other of them have, respectively, and the difference in plate thickness between the outer step adjustment plate and the thicker inner step adjustment plate. The step between the annular bead of the substrate and the peripheral bead, and thus the surface pressure of the annular bead is adjusted.

  Therefore, according to the cylinder head metal gasket of the present invention, in the three-layered cylinder head metal gasket, the level difference can be adjusted by the difference in plate thickness between the outer level difference adjustment plate and the thicker inner level difference adjustment plate. The lower limit of the step adjustment is the lower limit of the plate thickness difference between the outer step adjustment plate and the thicker inner step adjustment plate. But you can set it.

  Furthermore, according to the cylinder head metal gasket of the present invention, the claw-like protrusions inserted into the hooking holes and folded on at least one of the two substrates are aligned in the thickness direction of the gasket. Since the claw-like projection escape recess facing the claw-like projection is provided, the claw-like projection that one of the outer step adjustment plate and the inner step adjustment plate has at a radially outer position than the annular bead, It can be folded and doubled to prevent it from being sandwiched between two substrates while overlapping the other of the outer step adjustment plate and the inner step adjustment plate, and the claw-like projections function as shims. It is possible to prevent partial reduction in the surface pressure of the annular bead. In addition, according to this nail-like protrusion escape recess, the substrate does not open at the position of the nail-like protrusion, so that it is possible to prevent the cooling water from flowing between the cylinder block and the cylinder head at an unnecessary position. it can.

  Further, in the cylinder head metal gasket according to claim 2, in the two-layered cylinder head metal gasket, an outer step adjustment plate and an inner step adjustment plate that are thicker than the outer step adjustment plate, respectively. Are connected to each other by the engagement of the claw-like projections and the engagement holes that one and the other of them have, and the substrate is formed by the difference in plate thickness between the outer step adjustment plate and the thicker inner step adjustment plate. The step between the annular bead and the outer peripheral bead, and hence the surface pressure of the annular bead, is adjusted.

  Therefore, according to the cylinder head metal gasket of the present invention, in the two-layered cylinder head metal gasket, the lower limit of the step adjustment is a plate thickness difference between the outer step adjustment plate and the thicker inner step adjustment plate. Therefore, it is possible to set even a slight step for making the surface pressure balance between the annular bead and the outer peripheral bead appropriate.

  Further, according to the metal gasket for a cylinder head of the present invention, the claw-like projections are positioned on the substrate in alignment with the claw-like projections inserted into the engaging holes and turned back in the thickness direction of the gasket. Since the claw-like protrusion escape recess facing toward the inner side is provided, the claw-like protrusion that one of the outer step adjustment plate and the inner step adjustment plate has is folded back at a position radially outward from the annular bead. Can be prevented from overlapping with the other of the outer step adjustment plate and the inner step adjustment plate, and the claw-like projections function as shims to partially reduce the surface pressure of the annular bead. Can be prevented. In addition, according to this nail-like protrusion escape recess, the substrate does not open at the position of the nail-like protrusion, so that it is possible to prevent the cooling water from flowing between the cylinder block and the cylinder head at an unnecessary position. it can.

  In the present invention, the inner step adjustment plate may have an annular bead having an angled cross-sectional shape that is aligned in the thickness direction of the gasket with respect to the annular bead of the substrate and protrudes in opposite directions. Well, according to such a configuration, in the three-layered or two-layered cylinder head metal gasket, the number of annular beads to be overlapped can be increased to further improve the sealing performance against the combustion gas in the cylinder bore.

  In the present invention, the claw-shaped protrusion may be provided on the outer step adjustment plate, and the hooking hole may be provided on the inner step adjustment plate. In this way, the nail that is folded and folded back. Since the protrusions are made of the thinner plate constituting the outer step adjustment plate, the processability of the claw-shaped protrusions can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing the whole of the first embodiment of the cylinder head metal gasket according to the present invention, and FIG. 2 is a sectional view of the metal gasket of the first embodiment along the line AA in FIG. FIG. 3 is a plan view showing an upper substrate of the metal gasket of the first embodiment, FIG. 4 is a plan view showing an outer step adjustment plate of the metal gasket of the first embodiment, and FIG. FIG. 6 is a plan view showing a substrate on the lower side of the metal gasket of the first embodiment, and FIG. 7 is in the vicinity of the line AA of FIG. It is a perspective view which shows a cross section, and the code | symbol 1 in a figure shows a metal gasket, 2 is a board | substrate, 3 is an outer side level | step difference adjusting plate, 4 shows an inner side level | step difference adjusting plate, respectively.

  The cylinder head metal gasket 1 according to the first embodiment is of a three-layered type, and includes two substrates 2 each made of a stainless steel plate as a metal plate, as shown in FIG. As shown in FIGS. 3 and 6, a plurality of substrates 2 are formed corresponding to the respective cylinder bores of the cylinder block to which the cylinder head of the engine as the internal combustion engine in which the metal gasket 1 is incorporated (see FIG. 3). 3) corresponding to the cylinder hole 2a, an annular bead 2b having a chevron cross section formed around each cylinder hole 2a, the cooling water jacket of the cylinder block, and the cooling water hole of the cylinder head. A large number of cooling water holes 2c formed in the outer periphery of each annular bead 2b and the annular beads 2b and the cooling water holes 2c are entirely surrounded. And an outer peripheral bead 2d pieces slope-shaped cross-sectional shape formed in the location.

  Each of the two substrates 2 further has a plurality of lubricating oil holes 2e and a plurality of head bolts for fixing the cylinder head to the cylinder block (eight in the figure) on the outside of the outer peripheral bead 2d. Bolt holes 2f and grommet holes 2g described later, and the annular beads 2b of the two substrates 2 are aligned with each other in the thickness direction of the gasket 1 and are opposite to each other. The outer peripheral beads 2d of the two substrates 2 are also aligned in the thickness direction of the gasket 1 and protrude inward so as to be opposite to each other. .

  As shown in FIG. 2, the cylinder head metal gasket 1 according to the first embodiment also has an outer side made of a stainless steel plate as a metal plate having a thickness smaller than that of the substrate 2 between the two substrates 2, for example. A step adjustment plate 3 and an inner step adjustment plate 4 made of, for example, a stainless steel plate as a metal plate having a thickness equal to that of the substrate 2 are interposed, and the outer step adjustment plate 3 here is shown in FIG. As shown in FIG. 3, the engine extends from the position corresponding to the cooling water jacket of the cylinder block of the engine to the position of the outer peripheral ends of the two substrates 2. The outer step adjustment plate 3 has a plurality of claw-like projections 3a (four in each figure for each cylinder hole 2a in the substrate 2) protruding inward from the inner peripheral edge located corresponding to the cooling water jacket. In addition, a plurality of semicircular or semi-oval concave portions 3b provided on the inner peripheral edge and corresponding to the cooling water holes 2c of the respective substrates 2, and corresponding to the lubricating oil holes 2e and the bolt holes 2f of the respective substrates 2, respectively. It has a hole 3c and a grommet hole 3d described later.

  In FIG. 2, the vicinity of the claw-shaped protrusion 3 a is raised in advance in a half bead shape so that the inner step adjustment plate 4 and the outer step adjustment plate 3 are aligned on the same plane, while the lower surface of the claw-shaped protrusion 3 a is arranged on the inner step adjustment plate 4. However, it is not raised like a half bead in this way, and as shown in FIG. 7, even if a flat claw-like projection 3a is placed on the inner step adjustment plate 4, the cylinder block and If the gasket is sandwiched between the cylinder head and the vicinity of the claw-like protrusion 3a, the inner step adjustment plate 4 and the outer step adjustment plate 3 are aligned on the same plane.

  On the other hand, as shown in FIG. 5, the inner level difference adjusting plate 4 here extends from the inner peripheral position of the cylinder hole 2a, which is the position inside the annular bead 2b of the substrate 2, to the position of the cooling water jacket. . The inner step adjustment plate 4 has a hooking hole (a rectangular hole in the figure) 4a through which the nail projection 3a can be inserted at a position corresponding to each of the plurality of nail projections 3a of the outer step adjustment plate 3. A cylinder hole 4b corresponding to the cylinder hole 2a of each substrate 2, a hole 4c corresponding to the cooling water hole 2c of each substrate 2, and an outer peripheral edge located corresponding to the cooling water jacket are provided for each substrate 2 And a semicircular or semicircular recess 4d corresponding to the cooling water hole 2c.

  Further, in the cylinder head metal gasket 1 of the first embodiment, as shown in FIGS. 1 and 7, the claw-like projections 3 a of the outer step adjustment plate 3 are inserted into the engaging holes 4 a of the inner step adjustment plate 4. 4 is inserted from the upper side and the protruding portion from the engagement hole 4a is folded back on the lower side of the inner step adjustment plate 4 so that the claw-like projections 3a and the engagement hole 4a are engaged with each other. The step adjustment plate 4 is connected so that it does not overlap in the thickness direction except for the claw-like projection 3a.

  Furthermore, in the cylinder head metal gasket 1 of the first embodiment, the lower substrate 2 of the two substrates 2 is suitable for an open deck type cylinder block whose deck surface is wide open at the position of the cooling water jacket. 2 and 6, the thickness direction of the cylinder head metal gasket 1 with respect to the claw-like projections 3a inserted into the engagement holes 4a and folded back from the engagement holes 4a. The claw-like protrusion escape recess 2i that is embossed by a press and faces the claw-like protrusion 3a and allows the claw-like protrusion 3a to enter is provided at a position aligned with the claw-like protrusion 3a.

  In the cylinder head metal gasket 1 according to the first embodiment, as shown in FIG. 1, the grommet holes 2g and 3d are aligned between the two substrates 2 and the outer step adjusting plate 3 positioned therebetween. Ordinary grommets 5 inserted through are clamped, and the two substrates 2 and the outer step adjustment plate 3 and the inner step adjustment plate 4 positioned between them are positioned relative to each other. These grommet holes 2g and 3d are disengaged outward from the position between the cylinder block and the cylinder head of the engine. Therefore, the grommet 5 is located between the cylinder block and the cylinder head of the engine. The surface pressure of the beads 2b and 2d is not reduced by being sandwiched between the two.

  In the cylinder head metal gasket 1 according to the first embodiment, an outer step adjusting plate 3 and a thicker inner step adjusting plate 3 each positioned between two substrates 2 are one of them. The outer step adjustment plate 3 and the inner step adjustment plate 3 thicker than the outer step adjustment plate 3 are positioned by being connected to each other by the engagement of the claw-like protrusion 3a of the outer step adjustment plate 3 and the engagement hole 3a of the other inner step adjustment plate 3. 4, the step difference between the annular bead 2b and the outer peripheral bead 2d of the substrate 2 and the surface pressure of the annular bead 2b are adjusted.

  Therefore, according to the cylinder head metal gasket 1 of the first embodiment, in the three-layered cylinder head metal gasket 1, due to the plate thickness difference between the outer step adjustment plate 3 and the thicker inner step adjustment plate 4. In addition to increasing the surface pressure of the annular bead 2b of the substrate 2 by the step and improving the sealing performance against the combustion gas in the cylinder bore, the lower limit of the step adjustment is the outer step adjustment plate 3 and the lower step adjustment plate 3 Since it becomes the lower limit of the plate thickness difference with the thick inner level difference adjusting plate 4, it is possible to set even a slight level difference for making the surface pressure balance between the annular bead 2b and the outer peripheral bead 2d appropriate.

  Furthermore, according to the cylinder head metal gasket 1 of the first embodiment, the lower base plate 2 facing the cylinder block is inserted into each hooking hole 4a and turned back to each claw-like projection 3a. Claw-like protrusion escape recesses 2i that are aligned in the direction of the thickness of the claw-like projection escape recesses 2i provided on the lower substrate 2 when used in an open deck cylinder block. Corresponding to the projection 2 protrudes outward from the substrate 2 into the cooling water jacket opening on the deck surface of the cylinder block, and escapes into the claw-like protrusion escape recess 2i provided on the lower substrate 2. Since the claw-like projection 3a of the step adjustment plate 3 enters and escapes, the claw-like projection 3a is folded back and overlapped with the inner step adjustment plate 4 at a position radially outward from the annular bead 2b. Therefore, it is possible to prevent the nail-like protrusion 3a from functioning as a shim and partially reducing the surface pressure of the annular bead 2b. .

  Moreover, according to the cylinder head metal gasket 1 of the first embodiment, the claw-shaped protrusion escape recess 2i does not open the lower substrate 2 at the position of the claw-shaped protrusion 3a, but at the position of the claw-shaped protrusion 3a. Since the upper substrate 2 is not opened, it can be avoided that the coolant flows between the cylinder block and the cylinder head at an unnecessary position.

  FIG. 8 is a sectional view showing a second embodiment of the cylinder head metal gasket according to the present invention. In the figure, the same parts as those in the previous embodiment are designated by the same reference numerals. The metal gasket 1 for the cylinder head of the second embodiment is of the same three-layer type as that of the first embodiment, and is an open deck cylinder block in which the deck surface is wide open at the position of the cooling water jacket. In order to suit, the lower substrate 2 has a claw-like protrusion escape recess 2i as in the first embodiment, and the inner step adjustment plate 4 is formed of the metal gasket 1 against the annular beads 2b of the two substrates 2. An annular bead 4e having a chevron cross-sectional shape protruding in the opposite direction and aligned in the thickness direction, and correspondingly, the annular bead 2b and the outer peripheral bead 2d of the substrate 2 on the side facing the cylinder head The only difference from the cylinder head metal gasket 1 of the first embodiment is that the protruding direction is opposite to that of the first embodiment, and the other points are the same as the cylinder head metal gasket 1 of the first embodiment. It is constituted similarly.

  The cylinder head metal gasket 1 according to the second embodiment also provides the same operational effects as the first embodiment. Further, according to the cylinder head metal gasket 1 according to the second embodiment, three-layer lamination is possible. In a cylinder type metal gasket for a cylinder head, the number of annular beads to be overlapped can be increased to further improve the sealing performance against the combustion gas in the cylinder bore.

  FIG. 9 is a cross-sectional view showing a third embodiment of the metal gasket for a cylinder head according to the present invention. In the figure, the same parts as those in the previous embodiment are denoted by the same reference numerals. Unlike the first and second embodiments, the cylinder head metal gasket 1 of the third embodiment is of a two-layer type, and is on the side facing the cylinder block in the first embodiment shown in FIG. An outer peripheral bead 2d of the substrate 2 is formed on a single substrate 2 having the same configuration as that of the substrate (lower substrate in the figure) 2 with the same configuration as the outer step adjustment plate 3 in the second embodiment shown in FIG. The outer step adjustment plate 3 and the inner step adjustment plate 4 having the same structure as the inner step adjustment plate 4 in the second embodiment differ only in that they have corresponding outer peripheral beads 3e. Each step adjustment plate is connected to each other by the claw-like projections 3a of the outer step adjustment plate 3 inserted and folded back into the respective engagement holes 4a.

  According to the cylinder head metal gasket 1 of the third embodiment, the protrusion protruding outside the substrate 2 corresponding to the claw-like protrusion escape recess 2i provided on the substrate 2 is the cooling of the deck surface of the cylinder head. Since it enters into the water hole and escapes, the same effect as the first and second embodiments can be obtained in the two-layer structure.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described example. For example, each claw-shaped protrusion is provided on the inner step adjustment plate and the engagement hole is provided on the outer step adjustment plate. good.

  Furthermore, the cylinder head metal gasket of the present invention can be applied to a closed deck type cylinder block in which the deck surface is closed except for the cooling water hole at the position of the cooling water jacket. The convex portion corresponding to the concave portion may protrude into the cooling water hole on the deck surface of the cylinder block and escape.

  Furthermore, in the metal gasket for a cylinder head according to the present invention, the claw-like protrusion escape recesses may be formed by electric discharge machining or the like so that the corresponding protrusions do not occur outside the substrate.

  Thus, according to the metal gasket for a cylinder head of the present invention, the level difference can be adjusted by a difference in plate thickness between the outer level level adjusting plate and the inner level level adjusting plate that is thicker than the outer level level adjusting plate. Since it becomes the lower limit of the plate thickness difference with the thicker inner step adjusting plate, it is possible to set even a slight step for making the surface pressure balance between the annular bead and the outer peripheral bead appropriate.

  Furthermore, according to the metal gasket for a cylinder head of the present invention, since the outer step adjustment plate and the inner step adjustment plate are connected by pressing, the welding equipment and work are compared with those in which they are joined by welding. A process becomes unnecessary and a gasket can be manufactured more inexpensively.

  According to the cylinder head metal gasket of the present invention, the claw-like projections inserted into the engagement holes and turned back on the substrate are aligned in the thickness direction of the gasket and are directed to the claw-like projections. Since the claw-like projections of one of the outer step adjustment plate and the inner step adjustment plate are folded back outwardly in the radial direction from the annular bead Overlap with the other of the step adjustment plate and the inner step adjustment plate can be prevented, so that the claw-like projections function as shims and partially reduce the surface pressure of the annular bead. Can be prevented.

  In addition, according to this nail-like protrusion escape recess, the substrate does not open at the position of the nail-like protrusion, so that it is possible to prevent the cooling water from flowing between the cylinder block and the cylinder head at an unnecessary position. it can.

It is a top view which shows the whole 1st Example of the metal gasket for cylinder heads of this invention. It is sectional drawing which follows the AA line of FIG. 1 of the metal gasket of the said 1st Example. It is a top view which shows the board | substrate above the metal gasket of the said 1st Example. It is a top view which shows the outer side level | step difference adjustment plate of the metal gasket of the said 1st Example. It is a top view which shows the inner level | step difference adjustment plate of the metal gasket of the said 1st Example. It is a top view which shows the board | substrate of the lower side of the metal gasket of the said 1st Example. It is a perspective view which shows the cross section in the AA line vicinity of FIG. It is sectional drawing in the position similar to FIG. 2 which shows the structure of 2nd Example of the metal gasket for cylinder heads of this invention. It is sectional drawing in the position similar to FIG. 2 which shows the structure of 3rd Example of the metal gasket for cylinder heads of this invention.

Explanation of symbols

1 Metal gasket for cylinder head 2 Substrate
2a Cylinder hole
2b annular bead
2c Cooling water hole
2d outer bead
2e Lubricating oil hole
2f Bolt hole
2g grommet hole
2i Claw-like protrusion relief recess 3 Outer step adjustment plate
3a Nail projection
3b recess
3c hole
3d grommet hole
3e Outer bead 4 Inner step adjustment plate
4a Hanging hole
4b Cylinder hole
4c hole
4d recess
4e Peripheral bead 5 Grommet

Claims (4)

Cylinder holes (2a) each formed of a metal plate and corresponding to each cylinder bore of a cylinder block to which a cylinder head of an internal combustion engine can be assembled, and an annular bead having an angled cross section formed around each cylinder hole (2b), a cooling water hole (2c) formed in an outer peripheral portion of each annular bead corresponding to a cooling water jacket of the cylinder block and a cooling water hole of the cylinder head, the annular bead and the cooling Two substrates (2) having an outer peripheral bead (2d) having a one-sided cross-sectional shape formed in a position surrounding the water hole as a whole, and the annular beads (2) of the two substrates (2) ( In the laminated type metal gasket for cylinder head (1), 2b) are positioned in alignment with each other in the thickness direction of the gasket,
It consists of a metal plate, and consists of an outer step adjustment plate (3) extending from the position of the cooling water jacket to the position of the outer peripheral edge of the substrate (2), and a metal plate thicker than the outer step adjustment plate (3). And claw-like protrusions (3a) which one of the inner step adjustment plate (4) extending from the position inside the annular bead (2b) of the substrate (2) to the position of the cooling water jacket, The outer step adjustment plate and the inner step adjustment plate are inserted into the engagement hole (4a) of the other of the outer step adjustment plate and the inner step adjustment plate, and the projecting portion from the engagement hole is folded back so that the outer step adjustment plate (3) and the inner step adjustment plate (4) and
The outer step adjustment plate (3) and the inner step adjustment plate (4) are interposed between the two substrates (2),
At least one of the two substrates (2) is positioned in alignment with the claw-like protrusion (3a) inserted into the hooking hole (4a) and folded in the thickness direction of the gasket. Cylinder-shaped metal gasket for cylinder heads, which is provided with a claw-shaped protrusion relief recess (2i) facing the protrusion. A cylinder hole (2a) made of a metal plate and corresponding to each cylinder bore of a cylinder block to which a cylinder head of an internal combustion engine can be assembled, and an annular bead having a chevron cross section formed around each cylinder hole ( 2b), a cooling water hole (2c) formed in the outer peripheral portion of each annular bead corresponding to the cooling water jacket of the cylinder block and the cooling water hole of the cylinder head, the annular bead and the cooling water In a laminated type cylinder head metal gasket (1) comprising a single substrate (2) having an outer peripheral bead (2d) having a single bevel-shaped cross section formed at a position surrounding the hole as a whole,
It consists of a metal plate, and consists of an outer step adjustment plate (3) extending from the position of the cooling water jacket to the position of the outer peripheral edge of the substrate (2), and a metal plate thicker than the outer step adjustment plate (3). And claw-like protrusions (3a) which one of the inner step adjustment plate (4) extending from the position inside the annular bead (2b) of the substrate (2) to the position of the cooling water jacket, The outer step adjustment plate and the inner step adjustment plate are inserted into the engagement hole (4a) of the other of the outer step adjustment plate and the inner step adjustment plate, and the projecting portion from the engagement hole is folded back so that the outer step adjustment plate (3) and the inner step adjustment plate (4) and
The outer step adjustment plate (3) and the inner step adjustment plate (4) are overlaid on the substrate (2),
A claw-like shape positioned on the base plate (2) in alignment with the thickness direction of the gasket with respect to the claw-like projection (3a) inserted and folded into the hooking hole (4a) and facing the claw-like projection. Cylinder head metal gasket, characterized by a relief recess (2i).   The inner step adjustment plate (4) includes an annular bead (4e) having a chevron cross-sectional shape that is aligned in the thickness direction of the gasket with respect to the annular bead (2b) of the substrate (2) and protrudes in opposite directions. The metal gasket for a cylinder head according to claim 1 or 2, characterized by comprising. The claw-like protrusion (3a) is provided on the outer step adjustment plate (3),
The metal gasket for a cylinder head according to any one of claims 1 to 3, wherein the engagement hole (4a) is provided in the inner step adjustment plate (4).

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