KR100915313B1 - Metal gasket - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket which is opened between a cylinder block and a cylinder head of an internal combustion engine, and aims to increase the seal surface pressure of the opening edge portion for cylinders by beads.

Two elastic metal substrates A ₁ and A ₂ in which the beads 2 are formed at the peripheral edge portions of the plurality of cylinder openings 1 and the convex portions of the beads are arranged, and the plurality of cylinder openings ( 1) in a metal gasket formed of a thin metal plate (B) of the structure to connect with respect to, and forming an opening (3) to the substrate (a ₁₎ parts to be superimposed on the connection portion of the thin metal plate.

By providing the said opening part 3, the fall of the seal surface pressure of the opening edge part for cylinders by the connection part of a thin metal plate is suppressed, and as a result, the seal surface pressure of a bead part is raised.

Description

Metal gaskets {Metal gasket}

The present invention relates to an improvement of a metal gasket which is retrofitted between a cylinder block and a cylinder head of an internal combustion engine.

In an internal combustion engine, a sealing function is provided by retrofitting and fastening a metal gasket to the joining surface of a cylinder block and a cylinder head.

In particular, the seal in the area surrounded by the opening for the cylinder is important, and if the seal of this part is insufficient, the pressure inside the combustion chamber and overheating will appear.

Thus, as the metal gasket, a circumferential edge surrounding the opening for the cylinder is provided on the elastic metal substrate by using a cylinder opening and a concentric bead, and utilizing the repulsive force generated when the metal gasket is bolted. Many gaskets are constructed to increase the negative seal function.

Further, the inventors have combined the beaded elastic metal substrate with the metal thin plate disposed on the convex side of the bead and thinner than the elastic metal substrate, thereby surrounding the peripheral edge portion of the metal thin plate so that A metal gasket made thicker by the thickness of the plate to further increase the seal surface pressure has been proposed in the related art (Japanese Patent Application No. 2001-85586).

In the metal gasket, in the structure in which the metal thin plates disposed on the cylinder opening circumferential edge portion are connected to a plurality of cylinder openings, a surface pressure is generated at the connecting portion of the metal thin plate, thereby sealing the cylinder opening circumferential edge portion. A surface pressure falls, and surface pressure becomes nonuniform.

Moreover, in the said metal gasket, the surface pressure in the vicinity of a bolt is high by the cylinder block and cylinder head deformation after bolt fastening, and the surface pressure between cylinder openings and between bolts is low, and it becomes a nonuniform state.

In the gasket, the thin metal plate and the metal substrate are joined by various joining methods at the cylinder peripheral edge portion. As a joining method, a part of a metal thin plate is put in the accommodating hole formed in the metal substrate, and it bends, or the method of fixing by welding or welding is mentioned.

When this fixing method is taken, in the case of the bending fixing method, the thickness of the gasket becomes thicker than the surroundings by the thickness of the bent metal. In the case of welding or welding, the thickness of the joint is also thick because of the joint caused by the melting of the metal.

For this reason, a seal surface pressure falls in the edge part of a junction part, and surface pressure becomes nonuniform.

This invention is made | formed in view of the said problem, Comprising: It aims at providing the metal gasket which can further raise the seal surface pressure of the opening edge part for cylinders.

In order to achieve the above object, the first invention is a metal gasket interposed between a cylinder head and a cylinder block to seal between both sides, the metal gasket comprising a plurality of elastic metal substrates having beads formed at the periphery edges of a plurality of cylinder openings. And a thin metal plate disposed on the convex side of the bead and connected to a plurality of cylinder openings, the opening being provided in a portion of the elastic metal substrate overlapping the connecting portion of the thin metal plate. It is made a point.

According to the said structure, not only can the seal surface pressure by the repulsive force of a bead be made high as the sheet thickness of a metal thin plate, but also by the said opening part provided in the elastic metal substrate side, it is for cylinders by the surface pressure of the connection part of the said metal thin plate. The decrease in the surface pressure of the opening peripheral edge portion can be suppressed, and as a result, the seal surface pressure of the bead portion can be increased.

Further, the second invention is a metal gasket interposed between a cylinder head and a cylinder block to seal between both surfaces, the metal gasket comprising: a plurality of elastic metal substrates having beads formed in a plurality of cylinder opening peripheral edges; An opening in the site of the other elastic metal substrate disposed on the convex side of the bead, the metal thin plate having a structure connected to a plurality of cylinder openings, and overlapping the metal thin plate and the fixed portion of one elastic metal substrate. The gist is that is installed.

According to the said structure, not only can the seal surface pressure by the repulsive force of a bead be made high as the sheet thickness of a metal thin plate, but also the surface pressure of the fixed part of the said metal thin plate and an elastic metal plate by the said opening part provided in the elastic metal substrate side. The surface pressure drop of the cylinder opening peripheral edge portion can be suppressed, and as a result, the seal surface pressure of the bead portion can be increased.

Example

1 and 2 show one embodiment of the present invention.

1 and 2, the metal gasket is two elastic metal substrates (A ₁ having a thickness of 0.2 to 0.3 mm with convex beads 2 formed along the circumferential edge portion of each cylinder opening 1 of the multi-cylinder engine. , A ₂ ) and a thin metal plate having a thickness of 0.08 to 0.12 mm thinner than both elastic metal substrates, surrounding the peripheral edge portion of each cylinder opening with a predetermined width, and facing the bead convex portion side of the substrate, between the substrates. It is comprised by the metal thin plate B which consists of the annular part arrange | positioned at. Moreover, the metal thin plate B which consists of the said annular part is comprised in the structure which is integrally connected in the mutually adjacent part.

The substrate (A _1, A ₂₎ of one of the substrates (A ₁₎ has an opening 3 at the portion overlapping the connection portion of the thin metal plate (B) consisting of the ring-shaped portion is formed. The structure including this opening part 3 is shown in detail in FIG. 2 which is the cut-out enlarged sectional view of the XX line of FIG.

In the case where the thin metal plate B formed of the annular portion is connected to a plurality of cylinder openings, the surface pressure is generated in the connecting portion, whereby the surface pressure of the cylinder opening circumferential edge portion is lowered and the surface pressure is uneven. have.

In addition, due to the deformation of the cylinder head and the cylinder block after the bolting of the metal gasket, the surface pressure of the cylinder opening circumferential edge portion is high in the surface pressure in the vicinity of the bolt, and the surface pressure between the cylinder and the bolt is low, resulting in an uneven state.

However, with the structure in which the installation opening (3) in the region of the substrate (A ₁₎ overlapping the connection portion of the thin metal plate formed part annular, it is possible to suppress the cylinder opening peripheral edge of the seal surface pressure is lowered for as described above, Become.

In addition, it is possible to install an opening in the elastic metal substrate (A ₁₎ to suppress the cylinder opening peripheral edge of the seal surface pressure is lowered for. The example is illustrated below.

FIG. 3 shows a structural example in which a metal thin plate B is combined with one elastic metal substrate A ₁ . Also in this structural example, the same effect as above is acquired.

In the metal gasket, the thin metal plate (B) consisting of parts disposed annular, for each opening peripheral edge portion for the cylinder structure is fixed on one elastic metal substrate (A ₂₎ in four places of the metal part at the opening peripheral edge for the cylinder It is.

As for the fixed structure part of the said metal thin plate B, the expanded top view of the fixed structure part shown by the circle (a) of FIG. 1 is shown in FIG. 4, and FIG. 5 is the sectional drawing of the Y-Y line of FIG.

4 and 5, A ₁ and A ₂ are elastic metal substrates, and the tip of the arm plate portion 4 protruding integrally in the radial direction from the annular portion of the metal thin plate B is placed on the substrate A ₂ . The fixed structure part is formed by inserting into the accommodating hole part 5 provided, bending, and setting it as the latching plate part 4a. The other substrate (A ₁₎ has an opening 6 is formed in the portion corresponding to the fixed structure.

The fixing structure of the metal thin plate B made of the annular portion increases the lamination thickness of the plate by the locking plate portion 4a due to the bending of the arm plate portion 4, which causes a decrease in the seal surface pressure, but the substrate A ₁ By providing the opening part 6 in the opening and reducing the lamination thickness, the influence on the seal surface pressure drop can be suppressed.

6 and 7 show a modified example of the fixing structure, and FIG. 7 is a cross-sectional view taken along the line Z-Z of FIG. 6.

In this fixed structure part, the step part 7 is formed in the accommodating hole part 5 for inserting and bending the said arm plate part 4, and the latching plate part 4a of the arm plate part 4 overlaps there. According to this configuration, the substrate (A ₂₎ when engaging plate portion (4a) that it protrudes, if there is no step portion 7 at the gasket tightening, by using the bolt fastening force the plates of the board (A _2), distortion in the It is necessary to make it (curve), and the surface pressure around the opening for a cylinder falls.

In order to solve the above problem, the stepped portion is provided from the beginning so that the plate portion 4a does not protrude from the lower surface of the substrate A ₂ . Or the board part 4a may hurt another gasket at the time of gasket packaging, Therefore, the step part 7 may be provided and it may be applied also when there is no opening part 6.

8 to 10 are used to integrate the two elastic metal substrates A ₁ and A ₂ and the metal thin plates B in the outer region close to the bead by using a metal thin plate B composed of a wide annular portion. An example of the fixing structure is shown. 8 is a plan view of a part of the metal gasket, FIG. 9 is an enlarged cross-sectional view of the MM line of the fixed structure C of FIG. 8, and FIG. 10 is an enlarged cross-sectional view of the NN line.

This fixing structure combines the two elastic metal substrates A ₁ and A ₂ and the metal thin plate B integrally by press punching and caulking.

That is, the metal thin plates B disposed between the two elastic metal substrates A ₁ and A ₂ and both metal substrates are subjected to press punching in the thickness direction of the three metal plates in the outer region near the bead 2. As a result, as shown in FIG. 9 in the MM line direction, it is deformed into concave portions formed of the inclined plate portions 8, 9, and 10 that are continuous to the elastic metal substrates A ₁ and A ₂ and the metal thin plate B. Then, in the NN line direction, as shown in FIG. 10, the inclined deformation deformation pressure in which the inclined plate portions 8, 9, and 10 are cut out from the substrate A ₁ -metal thin plate B-substrate A ₂ . do. By pressing the concave bottom plate part by press working, the width in the NN line direction of the bottom plate part is rolled wider than the width of the cut-out opening part and coked integrally, and the metal thin plate B is placed on the elastic metal substrates A ₁ and A ₂ . ) Is fixed.

In addition, the thin metal plate (B) to a fixed structure of the substrate (A _1, A ₂₎ as the fixing structure for fixing the, around the opening for the cylinder 1 to 6 places the spot welding or laser welding or welding at the outer region of the bead May be applied.

Furthermore, the thin metal plate (B) as the fixed structure, and even if the adhesive over the entire surface area by means of an adhesive to the substrate (A _1, A ₂₎ around the cylinder opening, and also may be a portion of the adhesive.

Further, as the fixing structure for fixing to the substrate (A _1, A ₂₎ to the thin metal plate (B) in the second outer area of the sheets of the beads, it may be fixed with an adhesive.

FIG. 11 shows the fixing structure D in which the metal thin plate B and the one substrate A ₂ are integrally joined by press working in the outer region of the bead.

In this fixed structure, the elastic metal substrate A ₁ and the metal thin plate B are deformed by pressing in the thickness direction of the metal thin plate in the outer region of the bead, so that the press bottom inner surface 11 of the metal thin plate B is closed. Introduction snapped into part 12, the elastic metal substrate (a ₁₎ at ambient, and further into the strain in the lateral direction outer side, pass on to the part 14 around the press bottom part 13 of the elastic metal substrate (a ₁₎ states It is formed.

FIG. 12 shows a fixing structure in which the metal thin plate B is provided using a hand 15 formed in the substrate A ₁ in the outer region of the bead.

In other words, the tip of the arm plate portion 4 protruding from the annular portion of the metal thin plate B is inserted into the hand 15 and bent inward to fix the structure.

According to the configuration, since the use of the hand (15) of the substrate (A _1), there is no need to provide a receiving hole for inserting the arm plate portion of the thin metal plate to a substrate (A _1).

As mentioned above, according to this invention, the structure which arrange | positions the elastic metal substrate which respectively provided the beads in the circumferential edge part of several cylinder openings, and the convex part side of the said beads, and connects with respect to the several cylinder openings is provided. In the metal gasket which consists of a thin metal plate, since the opening part is formed in the site | part of the elastic metal substrate superimposed on the connection part of the said metal thin plate, the fall of the sealing surface pressure of the cylinder opening peripheral edge part by the connection part of a cylinder opening part is suppressed. As a result, the seal surface pressure of the bead portion can be increased.

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

2 is an enlarged cross-sectional view of the X-X line of FIG.

3 is a cut-away enlarged cross-sectional view of a modification of FIG. 2.

4 is an enlarged plan view of a portion shown in FIG.

5 is a cross-sectional view taken along the line Y-Y of FIG. 4.

6 is a cross-sectional view taken along the modification of FIG. 6.

7 is a cross-sectional view taken along the line Z-Z of FIG. 6.

8 is a partial plan view of a metal gasket showing another embodiment of the present invention.

9 is an enlarged cross-sectional view taken along the line M-M of FIG. 8;

FIG. 10 is an enlarged cross-sectional view of the N-N line in FIG. 8; FIG.

11 is a cross-sectional view of a structural part integrally joined by press working of a substrate and a thin metal plate.

12 is a partial plan view of a metal gasket showing another embodiment of the present invention.

※ Explanation of code for main part of drawing ※

A ₁ , A ₂ : elastic metal substrate B: metal thin plate

1: opening for cylinder 2: bead

3: opening 4: arm plate portion

4a: locking plate portion 5: receiving hole portion

6: opening 7: step

C: fixed structure part 8, 9, 10: inclined plate part

D: fixed structure part 11: inner surface of press bottom

12: Peripheral part 13: Press bottom

14: surrounding part 15: handmade

Claims (9)

A metal gasket interposed between a cylinder head and a cylinder block to seal between both sides, An elastic metal substrate having a bead formed in a plurality of cylinder opening peripheral edges, and a metal thin plate disposed on the convex side of the bead and connected to a plurality of cylinder openings, the connecting portion of the metal thin plate The opening is provided in the site | part of the said elastic metal substrate superimposed on, The arm plate part is integrally provided in the said metal thin plate, and the step | step which surrounds the shape of the bent part more than the thickness of a metal thin plate is provided in the board | substrate part where the arm plate part enters and bends the accommodating hole part provided in the said elastic metal substrate. Metal gasket characterized by the above. The metal gasket of Claim 1 which has two elastic metal substrates, arrange | positioned the said metal thin plate between them, and provided the said opening part in one elastic metal substrate. The metal gasket according to claim 1 or 2, wherein the metal thin plate is fixed to the elastic metal substrate by spot welding, laser welding or adhesive. The metal gasket according to claim 1 or 2, wherein the metal thin plate integrally couples the elastic metal plate and the metal thin plate at a portion of the metal plate adjacent to each other adjacent to the deformed bottom portion deformed by a press in the thickness direction. . delete A metal gasket interposed between a cylinder head and a cylinder block to seal between both sides, A plurality of elastic metal substrates having beads formed in a plurality of cylinder opening peripheral edges, and a metal thin plate disposed on the convex side of the beads and connected to the plurality of cylinder openings. The opening is provided in the site | part of the other elastic metal substrate which overlaps with the fixed part of one elastic metal substrate, The arm plate part is integrally provided in the said metal thin plate, and the step | step which surrounds the shape of the bent part more than the thickness of a metal thin plate is provided in the board | substrate part where the arm plate part enters and bends the accommodating hole part provided in the said elastic metal substrate. Metal gasket characterized by the above. The metal gasket according to claim 6, wherein the metal thin plate is fixed to the elastic metal substrate by spot welding, laser welding, or an adhesive. 7. The metal gasket according to claim 6, wherein the metal thin plate is integrally bonded to the elastic metal plate and the metal thin plate at a portion where the periphery of the deformable bottom portion deformed by pressing in the thickness direction is adjacent to each other. delete