JPH07239034A - Metal gasket - Google Patents

Abstract

PURPOSE:To easily provide a metal gasket of good sealing performance at low cost by forming a grommet by the folding back of the peripheral edge of the cylinder hole of an auxiliary plate to the opposite side of a main plate, and welding a portion near the outer peripheral edge of the grommet to the main plate. CONSTITUTION:Openings such as a cylinder hole 4, a bolt hole 5, a cooling-water hole 6 and a lubricant hole 7 are formed in a main plate 1 and openings other than the cylinder hole 4 are formed in an auxiliary plate 2, and the main plate 1 and the auxiliary plate 2 are made to overlap each other. The peripheral edge of the cylinder hole 4 in the auxiliary plate 2 is folded back to the opposite side of the main plate 1 to form a grommet 8, and an angular bead 9 is formed in the portion of the grommet 8 and a stepped bead 10 that surrounds a number of cooling water holes 6 arranged around the cylinder hole 4 is formed. A stepped bead 11 that surrounds the lubricant hole 7 is formed, and welding 12 is carried out on a portion near the outer peripheral edge 8a of the grommet 8 so as to weld the outer edge of the grommet 8 to the main plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket for a cylinder head of an internal combustion engine.

[0002]

2. Description of the Related Art Conventional metal gaskets of this type include a stack of several metal plates, and a bead is formed at the cylinder edge of these conventional metal gaskets. No beaded at the same time.

[0003]

As described above, the conventional metal gasket has a bead formed at the cylinder rim, but no grommet is formed, so that
In order to reliably seal the explosive gas in the cylinder, it was necessary to increase the repulsive force of the beads by polymerizing a large number of beads formed on a metal plate. Therefore, in order to construct the conventional metal gasket of this type, many metal plates of about 3 to 5 sheets are required, so that there is a problem that the cost is inevitably increased.

[0004]

In order to solve the above problems, in the present invention, in a metal gasket for a cylinder head, a metal plate having a relatively thick thickness is used as a main plate, and a metal plate having a thinner thickness than that is used. The plate is used as a sub plate, and the main plate is formed into a predetermined shape having openings such as a cylinder port, a bolt hole, a cooling water port, and a lubricating oil port, and the sub plate is formed into a predetermined shape having other openings except the cylinder port. Then, while superimposing these main plate and sub-plate, the cylinder mouth peripheral portion of the sub-plate is folded back to the opposite side of the main plate to form a grommet, and the grommet portion and other necessary portions of this polymerized metal plate are respectively formed. A bead is formed and a portion near the outer peripheral edge of the grommet is welded to the main plate to form a metal gasket.

In a metal gasket for a cylinder head, a metal plate having a relatively large thickness is used as a main plate,
The main plate is formed into a predetermined shape having openings such as a cylinder port, a bolt hole, a cooling water port, and a lubricating oil port, and the adjustment plate formed into a shape that surrounds the peripheral portion of the cylinder port of the main plate with an appropriate width is described above. Polymerize with the main plate, and form beads on the peripheral portion of the cylinder mouth and other necessary portions where the adjusting plate is superposed, and weld the portions near the inner peripheral edge and the outer peripheral edge of the adjusting plate to the main plate. Make up a metal gasket.

[0006]

As described above, in the first aspect of the present invention, the two metal plates, that is, the main plate and the sub plate, are superposed, and in particular, the peripheral edge portion of the cylinder opening of the sub plate is folded back to the side opposite to the main plate to form the grommet. Formed and formed beads on the grommet portion and other necessary portions of this polymerized metal plate, and further by welding the portion near the outer peripheral edge of the grommet to the main plate, the most sealing performance as a cylinder head gasket. Due to the folding back of the sub-plate, the peripheral portion of the cylinder port, which is strongly required to be thickened, becomes thicker than other portions by the plate thickness of the sub-plate. Moreover, since a bead is formed in this part and the part near the outer peripheral edge of the grommet is welded to the main plate, the surface pressure of this grommet part becomes the highest in the entire gasket when the gasket is tightened. Along with this, the repulsive force of the bead also becomes the strongest in this part. Therefore, according to the present invention, a metal gasket having a small number of two metal plates and good sealing performance can be obtained more easily and cheaply than the conventional metal gasket of this type.

In the second aspect of the present invention, the main plate is formed into a predetermined shape having openings such as a cylinder port, a bolt hole, a cooling water port, and a lubricating oil port as described above, and the peripheral edge of the cylinder port of the main plate. The adjusting plate formed in a shape surrounding a portion with an appropriate width is superposed with the main plate, and beads are formed on the peripheral portion of the cylinder mouth where the adjusting plate is superposed and other necessary portions, respectively, and Since the peripheral edge and the portion close to the outer peripheral edge were welded to the main plate respectively, the peripheral edge of the cylinder mouth, which is the most demanding sealing performance for the cylinder head gasket, is more likely than the other parts due to polymerization of the adjustment plate. It becomes thicker by the plate thickness. Moreover, since a bead is formed in this part and the adjustment plate on the inside and outside of this bead and the main plate are welded together, when tightening the gasket, the part of the gasket that overlaps this adjustment plate The surface pressure of the bead is the highest, and the repulsive force of the bead is also the strongest in this part. Therefore, according to the present invention, a metal gasket having a small number of two metal plates and good sealing performance can be obtained more easily and cheaply than the conventional metal gasket of this type.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a main plate made of a relatively thick metal plate, for example, a stainless steel plate (SUS 301) having a thickness of 0.2 to 0.25 mm is suitable. Reference numeral 2 is a sub plate made of a metal plate having a thickness smaller than that of the main plate 1, and has a thickness of 0.1 to 0.1, for example.
A 0.15 mm stainless steel plate (SUS 304) is suitable. Reference numeral 3 (see FIGS. 3 and 4) is an adjustment plate made of a thin metal plate, and for example, a stainless steel plate (SUS 301, 304) having a thickness of 0.1 to 0.05 mm is suitable.

Further, G indicates the whole metal gasket according to the present invention, 4 is a cylinder port formed in the gasket G, 5 is a bolt hole, 6 is a cooling water port, and 7 is a lubricating oil port.

1 and 2 show a first embodiment of the present invention. In this embodiment, the main plate 1 is provided with a cylinder port 4, a bolt hole 5, a cooling water port 6, and a lubricating oil port 7.
The secondary plate 2 is formed into a predetermined shape having openings such as
Is formed in a predetermined shape having openings other than the cylinder port 4, and the main plate 1 and the sub plate 2 are superposed on each other, and the peripheral edge of the cylinder port 4 of the sub plate 2 is placed on the opposite side of the main plate 1. The grommet 8 is folded back to form a chevron bead 9 as shown by a dotted line in FIG. 1 at the part of the grommet 8 of the polymerized metal plate, and a large number of cooling water ports arranged in the periphery of the cylinder port 4. 6 is formed as a step-like bead 10 (the bead shown by the one-dot chain line in FIG. 1), and the step-like bead 11 that surrounds the periphery of the lubricating oil port 7 (shown by the two-dot chain line in FIG. 1). Bead)
Further, as shown in FIG. 2, the outer peripheral edge 8 of the grommet 8 is
Welding 12 is applied to a portion close to a, and the outer edge portion of the grommet 8 is welded to the main plate 1.

FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, the main plate 1 is provided with a cylinder port 4, a bolt hole 5, a cooling water port 6 and a lubricating oil port. Main plate 1 formed into a predetermined shape having openings such as 7
The adjusting plate 3 formed in such a shape as to surround the peripheral portion of the cylinder port 4 with a proper width is superposed with the main plate 1, and the adjusting plate 3
A mountain-shaped bead 9 as shown by a dotted line in FIG. 3 is formed on the peripheral portion of the cylinder port 4 where the polymerized water is polymerized, and a large number of cooling water ports 6 arranged on the periphery of the cylinder port 4 are enclosed in a step shape. A stepped bead 11 that forms a bead 10 (a bead shown by a chain line in FIG. 3) and surrounds the periphery of the lubricating oil port 7 (a bead shown by a chain line in FIG. 3)
As shown in FIG. 4, welding 13 and 14 are respectively applied to the inner peripheral edge and the outer peripheral edge of the adjusting plate 3 to weld the adjusting plate 3 on the inner and outer sides of the bead 9 to the main plate 1. .

[0012]

As described above, in the first aspect of the present invention, the two metal plates of the main plate 1 and the sub plate 2 are polymerized, and the peripheral portion of the cylinder port of the sub plate 2 is opposite to the main plate 1. The grommet 8 is folded back to the side, and the beads 9, 10, 11 are formed on the grommet portion and other necessary portions of the polymerized metal plate, and the portion close to the outer peripheral edge of the grommet 8 is attached to the main plate 1. Since the welding is performed by welding, the peripheral edge portion of the cylinder port 4, which is required to have the highest sealing performance as a cylinder head gasket, becomes thicker than other portions by the thickness of the sub plate 2 due to the folding back of the sub plate 2. Moreover, since the bead 9 is formed in this portion and the portion of the grommet 8 close to the outer peripheral edge 8a is welded to the main plate 1, when the gasket is tightened, the surface pressure of the grommet portion in the entire gasket is reduced. Is the highest, and the repulsive force of the bead 9 is also the strongest in this part. In the present invention, the rigidity of the bead 9 is enhanced by the welding 12. Therefore, according to the present invention, it is possible to obtain a metal gasket having a small number of two metal plates and a good sealing performance, which is easier to manufacture and cheaper than the conventional metal gasket of this type.

In the second aspect of the present invention, as described above, the main plate 1 is connected to the cylinder port 4, the bolt hole 5, the cooling water port 6,
The adjustment plate 3 formed in a predetermined shape having an opening such as a lubricating oil port 7 and surrounding the peripheral edge of the cylinder port 4 of the main plate 1 with an appropriate width is superposed on the main plate 1 and the adjustment is performed. Beads 9, 10 and 11 are formed on the peripheral portion of the cylinder port 4 where the plate 3 is superposed and other necessary portions, and welding 13 and 14 are applied to the inner peripheral portion and the outer peripheral portion of the adjusting plate 3 respectively. Since the adjusting plate 3 is welded to the main plate 1 with the main plate 1, the peripheral portion of the cylinder port 4 which is required to have the strongest sealing performance as a cylinder head gasket has a larger amount of the adjusting plate 3 than other portions due to the overlapping of the adjusting plate 3. It becomes thicker by the plate thickness. Moreover, the bead 9 is formed in this portion, and the adjustment plate 3 on the inner and outer sides of the bead 9 and the main plate 1 are adhered to each other by the welds 13 and 14, which increases the rigidity of the bead 9. When the gasket is tightened, the surface pressure of the portion where the adjusting plate 3 is superposed becomes the highest in the entire gasket, and the repulsive force of the bead also becomes the highest in this portion. Therefore, according to the present invention, it is possible to provide a metal gasket having a small number of two metal plates and good sealing performance, which is easier to manufacture and cheaper than a conventional metal gasket of this type.

[Brief description of drawings]

FIG. 1 is a plan view of a metal gasket showing a first embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a metal gasket showing a second embodiment of the present invention.

4 is a partially enlarged cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 Main Plate 2 Sub Plate 3 Adjusting Plate G Metal Gasket 4 Cylinder Port 5 Bolt Hole 6 Cooling Water Port 7 Lubricating Oil Port 8 Grommet 9 Chevron Bead (Bead) 10, 11 Step-shaped Bead (Bead) 12, 13, 14 Welding

Claims (2)

[Claims] 1. In a metal gasket for a cylinder head, a metal plate having a relatively thick thickness is a main plate, and a metal plate having a smaller thickness is a sub plate, and the main plate is a cylinder port, a bolt hole, a cooling water port, The auxiliary plate is formed into a predetermined shape having openings such as a lubricating oil port, and the sub-plate is formed into a predetermined shape having openings other than the cylinder port, and the main plate and the sub-plate are superposed and the sub-plate is formed. A cylinder grommet of the above is folded back to the opposite side of the main plate to form a grommet, and beads are formed on the grommet portion and other necessary portions of this polymerized metal plate, and a portion near the outer peripheral edge of the grommet with respect to the main plate. Metal gasket characterized by being welded together. 2. A metal gasket for a cylinder head, wherein a metal plate having a relatively large thickness is used as a main plate, and the main plate has a predetermined shape having openings such as a cylinder port, a bolt hole, a cooling water port, and a lubricating oil port. A control plate formed into a shape that surrounds the peripheral edge of the cylinder mouth of the main plate with an appropriate width is polymerized with the main plate, and the bead is formed on the peripheral edge of the cylinder port where the control plate is polymerized and other necessary parts, respectively. And a portion close to the inner peripheral edge and the outer peripheral edge of the adjusting plate are welded to the main plate, respectively.