KR20130134069A

KR20130134069A - Gasket having half bead including full bead

Info

Publication number: KR20130134069A
Application number: KR1020120057327A
Authority: KR
Inventors: 박성관; 김덕근
Original assignee: 동아공업 주식회사
Priority date: 2012-05-30
Filing date: 2012-05-30
Publication date: 2013-12-10

Abstract

In the present invention, by incorporating a full bead structure into a half bead structure, while generating a high pressure surface pressure, which is an advantage of the full bead, the bead followability which is an advantage of the half bead can be improved together, and consequently, the sealing ability can be improved. According to the present invention, there is provided a metal gasket having a half-bead structure including a full bead in the metal gasket, wherein a full bead having a convex or concave shape is formed along the longitudinal direction of the half bead formed by the inclined surface. to provide.

Description

Gasket Having Half Bead Including Full Bead

The present invention relates to a metal gasket having a half-bead structure including a full bead, and more particularly, in a gasket used to seal between a cylinder block and a cylinder head of an internal combustion engine, the full bead portion of the wide bead portion The present invention relates to a metal gasket having a half bead structure including full beads for forming a high pressure surface pressure and improving bead followability.

In general, a gasket is inserted between a component or a mating surface or contact surface between fluid and gas, such as an engine (internal combustion engine), an oil / pneumatic device, to prevent leakage from being leaked. .

In particular, the gasket is applied to an engine part such as a vehicle. In the engine of the vehicle, the gasket is installed between the contact surface of the cylinder block and the cylinder head and between the contact surface of the cylinder head and the cylinder head cover. And prevent leakage of high pressure combustion gas in the combustion chamber.

The interior of the combustion chamber is placed in a mechanical environment where the pressure inside the cylinder changes continuously during the four-stroke cycle of compression, expansion, explosion, and exhaust.

In particular, since the internal gas pressure at the time of explosion is so high that it exceeds the clamping force of the cylinder head bolt, a lift-up force (hereinafter referred to as a 'lift force') is generated, and thus the gasket and the cylinder head are generated. There is a fine gap between the cylinder block and the.

Since the minute gap changes fluidly with the change of load in the cylinder during the cycle, a metal gasket with elasticity and durability is required to maintain a satisfactory seal in the internal combustion engine and to suppress the formation of a fine gap generated during explosion. Do.

As shown in Fig. 1, the metal gasket 1 according to the prior art is disposed between the cylinder head and the cylinder block of the internal combustion engine, joined to the lower surface of the cylinder head to the cylinder head cover by rivets, and fully assembled by bolts.

The conventional metal gasket primarily prevents gas leakage by the stopper, and secondaryly prevents leakage by the spring force of the molded beads.

The gasket bead is a non-linear elastic body that follows the movement of the engine. The bead has an elastic force by forming a ring-shaped waveform cross section on the peripheral plane of the holes such as the bore, the supply hole, the assembly hole, and the like. When a gap is generated and changed between the block and the cylinder head, the restoring force is maintained by finely moving upward and downward with a restoring force by its own elastic force.

For this purpose, the gasket bead is a full bead 11 structure of the metal gasket 10 as shown in the AA cross-sectional view of FIG. 2 and a half bead 21 structure of the metal gasket 20 as shown in the BB cross-sectional view of FIG. Have.

In this case, the full bead structure is applied to the site where the deformation of the counterpart is small and high pressure is generated, and the half-bead structure is applied to the site where the counter deformation is large and relatively low pressure is generated.

However, the conventional full bead structure has excellent seal at high pressure, but it is difficult to be applied to a large portion of the relative deformation because the bead followability is somewhat weak, whereas the half bead structure has a bead followability to the relative deformation. Is excellent, while somewhat weak at high pressure.

Accordingly, an object of the present invention for solving the above problems is to combine the full bead structure to the half bead structure to generate a high pressure surface pressure while improving the bead followability while also having a bead metal gasket having a half bead structure including a bead To provide.

The above object of the present invention has a half-bead structure including a full bead in the metal gasket, wherein a full bead having a convex or concave shape is formed along the longitudinal direction of the half bead formed by the inclined surface. Achieved by a metal gasket.

In addition, according to the present invention, a lower horizontal plane formed horizontally from the lower end side of the half bead to the inner edge of the bore portion; It is preferable to further include an image horizontal plane formed horizontally from the upper end side of the half bead to the outer edge of the outer side.

In addition, according to the present invention, the full bead is preferably formed to be symmetrical left and right from the center of the half bead inclined plane.

Further, according to the present invention, it is preferable that the upper horizontal plane, the lower horizontal plane and the full bead are formed while maintaining the same spacing in parallel with each other.

The metal gasket having the half-bead structure including the full-bead of the present invention by the above-mentioned problem solving means has a half-bead structure by incorporating the full-bead structure into the half-bead structure, while generating a high pressure surface pressure which is an advantage of the full-bead The bead followability, which is an advantage, can also be improved, resulting in improved seal capability.

1 is a plan view of a conventional metal gasket,
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1,
3 is a cross-sectional view taken along line BB of FIG.
4 is a plan view of a metal gasket having a half-bead structure including a full bead of the present invention;
5 is a cross-sectional view taken along line CC of FIG. 4.

Hereinafter, an embodiment of a metal gasket having a half-bead structure including a full bead of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a plan view of a metal gasket having a half-bead structure including the full bead of the present invention, and FIG. 5 is a cross-sectional view taken along line C-C of FIG.

As shown in FIG. 4, the metal gasket 30 of the present invention forms beads 33 and 34 between the inner edge of the bore portion 9 and the outer edge of the outer 8 side.

More specifically, the metal gasket 30 is disposed between the cylinder head and the cylinder block of the internal combustion engine, is joined to the lower surface of the cylinder head to the cylinder head cover by rivets, and is fully assembled by bolts.

The metal gasket 30 forms at least one bead between the inner edge and the outer edge, and in the embodiment of the present invention, a metal gasket having convex-shaped full beads formed on one half bead will be described. .

Therefore, a half bead or a double half bead is formed in one half bead as in the embodiment of the present invention, and is not limited to a convex full bead shape but formed on at least one of an inner edge or an outer edge side, and the half bead or double Convex full beads or concave full beads are formed in the half beads, respectively.

The bead of the metal gasket is a non-linear elastic body to be followed according to the movement of the engine, the bead has an elastic force by forming a ring-shaped waveform cross-section on the peripheral plane of the holes, such as bore, supply hole, assembly hole, etc. When the gap between the cylinder block and the cylinder head is generated and changed, the sealing force is maintained while moving up and down finely by the restoring force by the self-elastic force.

As shown in FIG. 5, the metal gasket 30 of the present invention has an upper horizontal plane 31 formed horizontally from an inner edge of the bore 9 and an upper horizontal plane formed from an outer edge of the outer 8 side. It consists of a half bead 33 to form a slope of the same width so as to connect a horizontal plane 32, the lower horizontal plane 31 and the upper horizontal plane 32, the half bead 33 is left and right on the slope A symmetrical convex or concave full bead 34 is formed.

Therefore, the full bead 34 is formed in the half bead so as to maintain the same width from both ends to the half bead.

At this time, the upper horizontal plane, the lower horizontal plane and the full bead are formed while maintaining the same distance in parallel to each other.

30 metal gasket 31 lower horizontal plane
32: horizontal plane 33: half bead
34: full bead

Claims

In the metal gasket,
A metal gasket having a half-bead structure including a full bead characterized in that the full bead having a convex or concave shape is formed along the longitudinal direction of the half bead formed by the inclined surface.

The method of claim 1,
A lower horizontal plane formed horizontally from a lower end side of the half bead to an inner edge of the bore side;
The metal gasket having a half-bead structure including a full bead further comprises a horizontal plane formed horizontally from the top side of the half bead to the outer edge of the outer side.

The method of claim 1,
The full bead is a metal gasket having a half-bead structure comprising a full bead, characterized in that the left bead is formed symmetrically from the center of the half bead slope.

The method of claim 3, wherein
The upper and lower horizontal planes and the full bead is a metal gasket having a half-bead structure including a full bead, characterized in that formed in parallel to each other at equal intervals.