JPH0569458U - Metal laminated gasket - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a metal laminated gasket in which a hole formed near the periphery of a gasket and an elongated side portion formed between the periphery of the gasket are reinforced by simple means. [Structure] A hole 22 is provided close to the side portion 26 of the metal laminated gasket 1, and the gasket constituent plates 12, 14, 16 of the elongated side portion 28 formed outside the hole 22 are fixed 36 to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal laminated gasket.

[0002]

[Prior Art]

 BACKGROUND ART It is well known that gaskets made by laminating thin metal plates have been used for cylinder head gaskets of internal combustion engines and exhaust manifold gaskets. The metal laminated gasket surrounds the hole to be sealed and is provided with a seal part on the substrate, and a gasket component plate without a seal part such as a surface plate and a thickness adjusting plate is laminated on this if necessary. It was done. The sealing portion is formed by simply stacking metal plates or pressing a substrate made of a hard elastic metal thin plate to provide a ridge, a so-called bead, around the hole to be sealed, or a ring surrounding the hole to be sealed. It is formed by arranging a metal wire in the shape of a wire, a so-called seal ring.

The seal portion is for sealing by pressing a joint surface such as a cylinder head and a cylinder body by a reaction force generated when the gasket is compressed to bring the gasket and the joint surface into close contact with each other. Therefore, the metal gasket has a feature that the pressing force can be adjusted according to the hardness, elasticity, thickness, etc. of the metal used, so that the sealing force can be easily adjusted according to the performance of the internal combustion engine. Moreover, because it uses metal, it has been able to withstand high temperatures and high pressures, and it has come to be used frequently together with the development of high-performance engines.

Further, even if the gasket normally has a shape protruding from the joint surface, not only the compressive force from the joint surface does not reach the portion, but also the protruding portion may interfere with other members around the portion. However, the appearance is not preferable. Therefore, the metal laminated gasket is usually formed in a shape that substantially matches the shape of the joint surface.

[0005]

[Problems to be Solved by the Invention] The problems to be solved by the present invention by a cylinder head gasket of an internal combustion engine will be described below. 5 and 6, holes 8 through which the push rods pass are formed near the outer wall 6 on the joint surface (deck surface) 4 of the cylinder head 1 and the cylinder body 2. The gasket component plates 12, 14, 16 of the cylinder head gasket (hereinafter simply referred to as a gasket) 10 interposed between the joint surfaces 4 have a shape that substantially matches the shape of the joint surface 4.

As shown in FIG. 6, the gasket 10 has a cylinder hole 18, a bolt hole 20, a push rod hole 22 corresponding to the hole 8 and other holes (not shown) such as a water hole and an oil hole, and a bolt 24. It is fastened with. As described above, since the hole 8 is provided along the outer wall 6, an elongated side portion 28 having a width W narrower than the length L is formed between the hole 8 and the gasket periphery 26. Reference numeral 18 'shown in FIG. 5 is a cylinder hole, and the seal portion provided around the cylinder hole 18 is omitted in FIGS.

As is well known, in addition to the thermal stress due to the combustion heat of the internal combustion engine, the gasket 10 receives the stress due to the thermal expansion and contraction of the gasket itself and the engine, and also receives the stretching force. At the same time, since the width W of the elongated side portion 28 is narrower than the length L, the elongated side portion 28 tends to be pushed outward by the stress as indicated by reference numeral 29. Then, since the periphery of the gasket such as the elongated side portion 28 is vigorously excited by the vibration of the internal combustion engine, there is a problem that the metal plate of the elongated side portion 28 is eventually damaged. It is conceivable that the elongated side portion 28 is formed to be wide so as to protrude from the joint surface 4 so as not to protrude outside. However, the portion thus protruded cannot resist the pushing force indicated by the arrow because it cannot be tightened by the joint surface 4.

Similarly, the same problem occurs in the exhaust manifold gasket (hereinafter simply referred to as gasket) 30 (FIG. 7) that is affected by high heat and strong vibration. That is, the gasket 30 is formed so as to substantially match the shape of a flange (not shown), and the tightening bolts 24 are normally arranged at two positions sandwiching the exhaust gas hole 32, and the middle of the gasket 30. The side 34 is a portion where the tightening force of the bolt 24 is hard to be applied. Moreover, in order to make the internal combustion engine small and lightweight, it is difficult to provide a sufficiently large flange, and the elongated side portion 28 is formed between the exhaust gas hole 32 and the intermediate side 34 in the same manner as described above. The elongated sides 28 are affected by thermal stress, thermal expansion and contraction, vibration, etc., and are extruded to the outside. Note that, also in FIG. 7, the sealing portion is omitted as in FIG.

The present invention has been made in view of the above problems. A hole is provided near the periphery of a gasket, and the outer width of the hole is narrower than the length of the side portion. It is an object of the present invention to provide a metal laminated gasket in which the elongated side portions are reinforced by simple means and the elongated sides are prevented from protruding outside the gasket.

[0010]

[Means for Solving the Problems]

 The structure of the metal laminated gasket of the present invention for achieving the above object is such that the width of the side portion formed between the hole for forming the gasket and the periphery of the gasket is greater than the length of the side portion. A hole that penetrates the gasket is formed near the periphery of the gasket that is shortened, and the elongated gasket forming plates of the side portions are fixed to each other.

The shape of the elongated side portion is not constant depending on the shape of the hole and the gasket. In short, the elongated side portion means a slender shaped portion that is extruded to the outside by thermal stress, vibration, or the like. The fixing means is not particularly limited, but is usually spot welding, and as other fixing means, laser welding or the like can be appropriately used. Further, the position and range to be fixed are not particularly limited other than being provided on the outer portion, and may be appropriately determined according to the situation. However, as the gasket component plate is usually a plate with a thickness of about 0.15 to 0.4 mm, it is necessary to pay sufficient attention to prevent plate deformation and ensure flatness.

The hole to which the present invention is applied may be either a hole to be sealed or a hole that does not need to be sealed. In short, the hole is provided near the gasket periphery. be able to. INDUSTRIAL APPLICABILITY The metal laminated gasket of the present invention can be advantageously applied to a cylinder head gasket which is affected by thermal expansion and contraction, vibration, etc., and an exhaust manifold gasket. However, the present invention is not limited to this, and can be applied to all metal laminated gaskets having the same problems as described above.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the first embodiment shown in FIGS. 1 and 2, a cylinder head gasket (hereinafter simply referred to as a gasket) 10 made of a metal laminated gasket has the same members as those of the cylinder head gasket 10 shown in FIG. However, the description is omitted. Reference numeral 33 in the figure is a bead for sealing. As shown in FIGS. 1 and 2, the elongated side portions 28 of the water hole 22 were spot-welded 36 at a plurality of points (five points in the figure), and the gasket constituent plates 12, 14, 16 were integrally fixed. Therefore, the rigidity of the elongated side portion 28 of the gasket 10 in the width W direction can be made sufficiently large compared to before welding, and the elongated side portion 28 can be pushed out to the outside for long-term use. I was able to prevent it.

The second embodiment shown in FIGS. 3 and 4 is carried out on the metal laminated gasket 30 for the exhaust manifold, and the same members as the gasket 30 shown in FIG. Is omitted. As shown in FIGS. 3 and 4, the elongated side portions 28 of the exhaust gas hole 32 were spot-welded 36 at a plurality of locations (three locations in the figure), and the gasket constituent plates 12, 14, 16 were integrally fixed. Therefore, the rigidity of the elongated side portion 28 of the gasket 30 in the width W direction can be made sufficiently larger than the rigidity before welding, and the elongated side portion 28 is extruded to the outside for long-term use. I was able to prevent that. In each of the above examples, the gasket constituent plates 12, 14, 16 of the elongated side portion 28 are fixed by spot welding, but this is continuously applied over a predetermined region by other fixing means such as laser welding. It can also be fixed.

[0015]

[Effect of the device]

 As described above, since the metal laminated gasket of the present invention is configured, a narrow narrow side with respect to the length is formed between the hole provided near the periphery of the gasket and the periphery of the gasket. It is possible to dramatically improve the rigidity of the portion, particularly the resistance to the force of pushing outward. Therefore, even in a gasket that is subjected to repeated thermal expansion / contraction actions and strong vibration, it is possible to prevent the gasket from being damaged during long-term use.

[Brief description of drawings]

FIG. 1 is a partial plan view of a metal laminated gasket according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view of a metal laminated gasket according to a second embodiment of the present invention.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a schematic explanatory diagram of a problem when a conventional metal laminated gasket is attached to an internal combustion engine.

FIG. 6 is a partial plan view of the metal laminated gasket used in FIG.

FIG. 7 is a plan view of another conventional metal gasket.

[Explanation of symbols]

1 Cylinder Head 2 Cylinder Body 4 Joint Surface 6 Outer Wall 8 Hole 10 Metal Laminated Gasket (Gasket) 12 Gasket Component Plate 14 Gasket Component Plate 16 Gasket Component Plate 20 Bolt Hole 22 Hole 24 Bolt 26 Gasket Surrounding 28 Long Side 30 Metal Laminate Shaped gasket (gasket) 32 Exhaust gas hole 34 Intermediate side 36 Spot welding (fixing means)

Claims (2)

[Scope of utility model registration request] 1. A hole penetrating a gasket is formed in the vicinity of the gasket such that the width of a side portion formed between the gasket and the periphery of the gasket is shorter than the length of the side portion. Then, a metal laminated gasket in which the elongated gasket forming plates on the sides are fixed to each other. 2. The metal laminated gasket according to claim 1, wherein the fixing means is spot welding.