KR200221092Y1 - Cylinder head gasket - Google Patents

Abstract

The present invention relates to a cylinder head gasket in which a clinching is performed simultaneously in the manufacturing process of a sealing bead shape formed on a gasket, and a cut is cut in one end of a metal plate by a piercing process and then folded around. The bush shape is made and folded, and a clinching part for clinching a plurality of metal plates by a folding process and a flattening process is provided, thereby eliminating the need for separate parts and a separate process. Improvements can be made.

Description

Cylinder Head Gasket {CYLINDER HEAD GASKET}

The present invention relates to a cylinder head gasket, and more particularly to a cylinder head gasket that can be clinched simultaneously in the manufacturing process of the sealing bead shape formed on the gasket.

In consideration of global environmental regulations, low emissions, low fuel consumption and high-power vehicles are on the rise. Recently, high-performance compact engines have been put into practical use.

Therefore, it is necessary to seal the combustion gas, cooling water and oil of the internal combustion engine at the same time, and it is inevitable to develop a cylinder head gasket (hereinafter, referred to as a gasket) with a high sealing function according to high power.

Conventionally, a gasket developed for the purpose of being applied to a low pollution engine and a small engine is proposed as a structure in which a plurality of thin metal plates are mainly combined.

On the other hand, as a conventional technique of clinching a plurality of thin metal plates including the sealing function of each part, methods by rivets and methods by welding are mainly used.

The former method of riveting is to make a setting hole in a plurality of metal plates each of which includes a partial sealing function, to make a jig to fit the plurality of metal plates to the setting hole, and to stack a plurality of metal plates on the jig, It is a method of inserting and clinching, which reduces productivity due to separate parts (rivets) and riveting.

The latter welding method requires a separate welding jig and a welding machine, and requires a welding process to perform clinching, and has a disadvantage in that thermal deformation of a functional part by welding must be considered.

Therefore, the present invention is to solve such a conventional problem, the cylinder can be achieved economically and productivity by eliminating the need for separate parts and separate processes by the clinching at the same time in the manufacturing process of the sealing bead shape formed on the gasket The purpose is to provide a head gasket.

The present invention for realizing the above object is a plurality of thin metal plate is stacked, the cylinder hole, the coolant hole and the oil hole is formed in at least one of the plurality of thin metal plate, the sealing bead shape is provided around each hole In the cylinder head gasket, a cut is made in one end of the metal plate by a piercing process, a bush shape is formed by a burring process, and folded up, a folding process and a flattening process. A clinching portion for clinching a plurality of metal plates by a flattening process is provided.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a plan view showing a cylinder head gasket having a clinching portion according to the present invention;

2a to 2d is a plan view and a sectional view showing a clinching part manufacturing process according to the present invention,

3a to 3f are schematic cross-sectional views showing the shape of the piercing process for making the bush shape of the clinching portion according to the present invention and arranging the shape of the punch used in the folding process in cross-sectional shape,

4 to 6 is a plan view and a cross-sectional view showing different embodiments of the clinching portion according to the present invention.

<Explanation of symbols for main parts of the drawings>

SB: Sealing Bead M: Metal Plate

10: clinching portion 11: sheath

12 punch 13 bending surface

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

1 is a plan view showing a cylinder head gasket having a clinching portion according to the present invention, in which a cylinder hole Hc, a coolant hole Hw, and an oil hole Ho are formed in a metal plate M for a gasket. The sealing bead (SB) shape is provided around each hole, and the clinching part 10 is provided in the end of the metal plate M by the characteristic structure of this invention. Typically, the sealing bead SB of the gasket made by stacking the plurality of metal plates M is folded around the cylinder hole Hc, the coolant hole Hw, the oil hole Ho, and the like to form a bush shape. It is formed through the step of binding a plurality of metal plates in the overlapping process, and flattening by the flattening process.

The clinching part 10 according to the present invention is made at the same time as the manufacturing process of the sealing beads SB described above. That is, a plurality of clinching portions 10 are formed at one end of the edge of the metal plate M on which the sealing beads SB are to be formed.

2A to 2D are plan views and cross-sectional views showing the manufacturing process of the clinching portion according to the present invention. The clinching portion 10 according to the present invention first includes a cylinder hole Hc and a coolant hole Hw in the metal plate M. And a clinching forming portion is added to the piercing mold during the piercing process of forming the oil hole Ho, and the like, so that the cut sheath 11 and the punch 12 are formed at the position where the clinching portion 10 is to be formed. .

The cut cut 11 of the clinching portion 10 shown in FIG. 2A has a shape drawn in the horizontal and vertical directions, and the punch 12 has a circular shape. Here, the part shown by the silver line ideally shows the state of the bending surface 13 in which the metal plate M of the clinching part 10 was finally folded.

FIG. 2B illustrates a state in which the bush shape 20 is formed in a burring process by folding the metal plate M in a state where the shape of the cut 11 and the punch 12 are completed on the clinching part 10. That is, when the punch rod having a circular flat cross section is aligned with the clinching portion 10 and pressurized, the shape of the cut sheath 11 cut by the punch rod is torn and bent in the vertical direction. This folding process is performed simultaneously when the folding process is performed to form the sealing bead SB around the cylinder hole Hc, the coolant hole Hw, and the oil hole Ho described above.

Then, other metal plates Ma and Mb having holes formed thereon are laminated to the bush-shaped metal plate M, which can be inserted in advance in the bush shape. In the exemplary drawing, a gasket composed of three sheets is shown. The middle plate Ma, the lower plate Mb, and the like are stacked below the metal plate M (upper plate) on which the bush shape 20 is formed.

Subsequently, as shown in FIG. 2C, the bush shape 20 is maximally bent in both directions through a folding process. In the folding overlap process, the bush shape 20 may be folded and overlapped as the vertex is inserted from the bottom to the top of the bush shape 20 by using a punch having a conical shape. This folding process is also performed at the same time when performing the folding process to form the sealing beads SB around the cylinder hole Hc, the coolant hole Hw, and the oil hole Ho described above.

Subsequently, as shown in FIG. 2D, the bushing surface is bent completely outward through a flattening process, so that the bent surface 13 adheres to the middle plate Ma and the lower plate Mb to complete clinching. This flattening process is also performed simultaneously when the flattening process is performed to form the sealing bead SB around the cylinder hole Hc, the coolant hole Hw, and the oil hole Ho described above.

On the other hand, Figures 3a to 3f shows the shape of the sheath 11 of the piercing process for making the bush shape of the clinching portion 10 according to the present invention and arranged the cross-sectional shape of the punch 12 used in the folding process Schematic cross-sectional views.

According to the present invention, it is preferable that such a shape of the sheath 11 and the shape of the punch 12 be usefully modified according to the number of sheets of the metal plate M constituting the gasket and the clinching method.

First, Figure 3a is the shape of the sheath (11a) is formed in the longitudinal direction, the punch (12a) shape is formed in a circular shape when the final clinching is completed, the bending surface (13a) is shown in both sides as shown in the hidden line close contact Will have

Figure 3b is the shape of the sheath (11b) is formed toward the outer direction at intervals of 120 degrees from the center point, the punch (12b) shape is formed in a circular shape when the final bent clinching surface 13b is opened in three directions close contact Will have

Figure 3c is a cross-shaped cut (11c) shape is formed at the center point, the punch (12c) shape is formed in the elliptical shape when the final bent clinching surface (13c) is opened in four directions, the bending surface ( 13c) has a shape in close contact with the major axis direction and the minor axis direction.

Figure 3d is formed in the shape of the X-shaped sheath (11d) at the center point, the punch (12d) shape is formed in a circular shape when the end of the final clinching 13d is opened in four directions, the bending surface of the 13d The planar shape has a rhombic shape.

Figure 3e is the shape of the sheath (11e) is formed in the direction toward the outer direction in the 5 direction from the center point, the punch (12e) shape is made in a circular shape when the final clinching is completed, the bending surface (13e) is opened in five directions to closely adhere to the star shape It has a shape that becomes.

Figure 3f is a shape of the sheath (11f) toward the outer direction at intervals of 60 degrees from the center point, the punch (12f) shape is formed in a circular shape when the end of the final clinching 13f is opened in six directions as if petal shape It will have a shape that is in close contact with.

In addition, the sheath shape and the punch shape of the clinching part 10 may be variously modified.

On the other hand, Figures 4 to 6 is a plan view and a cross-sectional view showing different embodiments of the clinching portion according to the present invention.

The clinching unit 10 according to the present invention shown in FIG. 4 is an example in which the clinching unit 10 is formed on the middle plate M-1 of a three-piece gasket, and one side of the bent surface 13a-1 is an upper plate ( M-2) is bent upward, and the other side bent surface (13a-2) is bent under the lower plate (M-3) is showing a structure clinched.

Here, the shape of the cut sheath 11 and the shape of the punch 12 of the clinching portion 10 is an example in which the shape of the simplest sheath 11a in the longitudinal direction and the shape of the circular punch 12a are applied.

As described above, an advantage obtained by forming the clinching portion 10 in the intermediate plate M-1 is that the number of metal plates M increases so that the height H of the bush shape shown in FIG. There is an advantage that can be applied when the thickness or similar to the total thickness (T). This has the advantage that the diameter of the clinching portion 10 can be maintained as it is or even reduced, even if the number and total thickness T of the metal plate M are increased.

Meanwhile, as illustrated in FIG. 4, the clinching portion 10a applying the shape of the longitudinal sheath 11a and the circular punch 12a is the opposite surface on which the bending surface 13a is bent, that is, the bending surface 13a-1. The lower part and the upper part of the bent surface 13a-2 have a disadvantage in that the binding force of clinching does not work in an open state.

Figure 5 is to compensate for such a disadvantage, the intermediate plate (M-1) to form a clinching-like clinching portion (10b) described above to cross each other to bend the bending surface 13b in the opposite direction It is shown.

As such, the odd bent surfaces 13b-1, 13b-3, and 13b-5 are bent upwards, and the even bent surfaces 13b-2, 13b-4, and 13b-6 are bent downwards. Both M-2) and the lower plate (M-3) can be firmly attached.

On the other hand, Figure 6 is another modified embodiment for clinching the upper plate and the lower plate in the intermediate plate using any one of the clinching portion (10c, 10d) of any one of the clinching portion (10c) is bent to the upper plate (M- 2) and the other clinching portion 10d is bent downward to clinch the lower plate M-3.

As described above, the above description merely illustrates a preferred embodiment of the present invention and can be applied to not only a cylinder head gasket installed between a cylinder head and a block of an internal combustion engine, but also to a general gasket, and those skilled in the art will have the gist of the present invention. It should be appreciated that modifications and variations can be made to the present invention without changing the design.

As described above, according to the present invention, compared to the riveting method and the welding method of the prior art, a clinching shape is formed together with the sealing bead design from the press mold, and simultaneously shown in the riveting method by clinching through the sealing bead manufacturing process. No extra rivet jig and operation is required, and rivet parts can be reduced.

In addition, the welding rod, the welding machine, and the welding process shown in the welding method are not necessary, and the deformation by the welding does not need to be considered.

In particular, since the sealing bead shape and the same process are manufactured in the same process, it is possible to reliably match the complex sealing bead shapes of various plates, which is stable in terms of quality.

In addition, the upper plate and the lower plate are completely folded and closely stacked in an eyelet shape, so that several plates are firmly assembled as one sheet so that they are not separated from the moving and assembly process.

Claims (10)

In a cylinder head gasket in which a plurality of thin metal plates are stacked, a cylinder hole, a coolant hole, and an oil hole are formed in at least one of the plurality of thin metal plates, and a sealing bead shape is provided around each hole. Cut one end of the metal plate by a piercing process, make a bush shape by folding it around, and fold it up, and plural by a folding process and a flattening process. A cylinder head gasket, characterized in that a clinching portion for clinching a metal plate is provided. The shape of the cut sheath 11 of the clinching portion 10 is formed in a horizontal and vertical direction, and the punch 12 is formed of any one of a circle, a semicircle, an ellipse, and a rotor shape. Cylinder head gasket, characterized in that. The shape of the cut sheath (11b) of the clinching portion is formed outwardly at intervals of 120 degrees from the center point, and in the shape of a punch (12b) of any one of a circle, a semicircle, an ellipse or a rotor type. Cylinder head gasket, characterized in that made. 2. The cylinder head gasket according to claim 1, wherein a shape of the cut sheath (11c) of the clinching portion is formed in a cross shape (+), and an elliptical punch (12c) is formed. The method of claim 1, wherein the shape of the cut sheath (11d) of the clinching portion is formed in an X-shape at the center point, characterized in that the punch 12d of any one of a circle, a semicircle, an ellipse or a rotor shape. Cylinder head gasket. The shape of the cut sheath (11e) of the clinching portion is formed outwardly in five directions from the center point, and formed in the shape of a punch (12e) of any one of a circle, a semicircle, an ellipse or a rotor type. Cylinder head gasket, characterized in that. The shape of the cut sheath (11f) of the clinching portion is formed outwardly at intervals of 60 degrees from the center point, and formed into a punch (12f) shape of any one of a circle, a semicircle, an ellipse or a rotor type. Cylinder head gasket, characterized in that made. The method of claim 1, wherein the clinching portion 10 is formed in the middle plate (M-1) of the gasket, one side of the bending surface 13-1 is bent over the upper plate (M-2), the other bending surface ( 13-2) is a cylinder head gasket, characterized in that bent under the lower plate (M-3). 2. The method according to claim 1, wherein the clinching portion (11b) is formed in the middle plate (M-1) of the gasket, and the bent surface (13b) cross each other and bent in the opposite direction to be odd-numbered bent surface (13b-1, 13b-3, 13b-5) is bent upwards, and the even-numbered bending surface (13b-2, 13b-4, 13b-6) is bent downwards. The method of claim 1, wherein one of the clinching portion (10c) is bent upward by using two places of the clinching portion (10c, 10d) to clinch the upper plate (M-2), and another clinching portion (10d) The cylinder head gasket, characterized in that the lower plate (M-3) is clinched by bending downward.