JP2001200755A - Gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing performance of a gasket, by arranging a seal member consisting of elastic material around a gas hole to bury the seal member in looseness in a tightened condition between parts to make the sealing member cause elastic deformation by a follow up to a fluctuating combustion pressure so as to generate a uniform surface pressure. SOLUTION: This gasket has a ring-shaped sealing member 1B provided with gas holes 3, 9, capable of elastic deformation and outer side elastic metal plates 2, 2A arranged in an outer side region of the ring-shaped sealing member 1B and connected to it. The ring-shaped sealing member 1B causes elastic deformation according to looseness of parts opposed, when the part of an engine is tightened, to ensure uniformity of a seal surface pressure by uniformly distributed tightening load around the gas holes 3, 9. The ring-shaped seal member 1B is formed in egg shape, where the cross section in an inner circumferential side has a thickness larger than in the outer peripheral side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket comprising, for example, a ring-shaped sealing member applied between opposing surfaces of a cylinder head and a cylinder block, and an outer elastic metal plate surrounding the ring-shaped sealing member.

[0002]

2. Description of the Related Art Conventionally, a metal head gasket incorporated in an automobile engine seals a combustion gas in a cylinder bore, and a bead or grommet provided along a combustion chamber hole formed in an elastic metal plate, an elastic metal gasket. It was common to have an elastic surface coating material coated on the surface of the board. Further, a gasket which is interposed between a cylinder head and a cylinder block and has a convex bead or shim around a bore hole is known.

A gas seal mechanism for a cylinder head gasket is disclosed in Japanese Utility Model Laid-Open No. 58-92442. The gas sealing mechanism is such that a metal ring is formed in a seal ring having a circular cross section, the seal ring forms a flat surface vertically, the seal ring is enclosed by a metal grommet, and the metal grommet surrounds the outside of the seal ring. Connected to a gasket base located at The gas seal mechanism is intended to reduce indentation on the grommet, secure the minimum seal width required for gas seal from the beginning, and improve the sealing performance.

The single-plate metal gasket disclosed in Japanese Patent Application Laid-Open No. 63-149479 is provided with a compensating member for compensating for irregularities in the gap of the deck surface at the time of press-fastening at the inner peripheral portion of the combustion chamber hole. Is what it is. The compensating member is formed of a grommet having a thickness greater than the bead thickness at the time of pressing and fastening.

In the gasket disclosed in Japanese Patent Application Laid-Open No. 63-101574, a through hole serving as a high-pressure portion to be sealed is formed in at least one gasket main body at a sealing portion. A grommet is attached to the inner peripheral edge of the hole, and a bead portion surrounding the grommet protrudes from the gasket body.

[0006]

On the other hand, when a cylinder head and a cylinder block having a gasket interposed therebetween are fastened by bolts, the fastening load around the bore becomes uneven due to the arrangement of the fastening bolts. Inevitably, this unevenness cannot be eliminated by the elastic structure around the bore. There is a point in the prediction of the minimum load part, that is, the minimum surface pressure part, and the numerical value of the seal using the metal gasket having the above structure. However, this prediction is actually difficult, and it is generally necessary to set a large numerical value. Has secured the seal. However, securing a large load (surface pressure) on the metal gasket causes large changes over time, such as sag during operation. When the seal portion is sagged, high-temperature gas penetrates and the high stress area of the metal gasket There is a risk that cracks or the like may occur in the bead portion. The major problem with the gasket tightening force is that the deformation of the bore of the cylinder block of the engine increases, and the deformation of the bore decreases the fuel efficiency due to the increase in the frictional force between the cylinder block and the cylinder head, and the output decreases. This leads to a state in which the emission and the like increase and the emission and the like increase. One of the major issues in engine development is to eliminate uneven loads around the bore on the surface of the engine that faces the cylinder head and cylinder block.

In the engine, especially when the cylinder head is fastened to the cylinder block with a gasket interposed therebetween, the surface pressure distribution around the bore hole transmitted from the bolt axial force to the gasket becomes non-uniform, and the gasket becomes uneven. The surface pressure becomes uneven. In particular, since the metal gasket is exposed around the bore hole portion, the metal gasket is hardly elastically deformed even by the fluctuating combustion pressure generated by the combustion of the engine, and the sealing performance around the bore during the combustion of the engine cannot be ensured.

To solve the above problems, the applicant has
In a metal gasket, 18 around the bore of the elastic metal plate
By forming a folded part that is bent at 0 ° and providing a stopper function for the bead at the folded part, a metal gasket was developed, in which a gap is provided in the folded part and the degree of deformation is taken into account with the magnitude of the tightening load and the degree of deformation. An application was filed as Japanese Patent Application No. 10-241511.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a gasket which is applied between facing surfaces of parts such as a cylinder head and a cylinder block or a cylinder head and a manifold. At
A ring-shaped seal member elastically deformed in accordance with the bending generated in the opposed part in the fastened state of the part and elastically deformed by the fluctuating combustion pressure generated by the combustion of the engine is provided at the distal end of the gasket main body around the gas hole. An object of the present invention is to provide a gasket in which the distribution of a tightening load around a gas hole is made uniform by the ring-shaped seal member and the seal surface pressure is made uniform.

The present invention is directed to a gasket disposed between opposed flat surfaces of a component having gas holes disposed opposite to each other for use in an engine, for sealing between the flat opposed surfaces. The gasket includes a gasket main body, and a seal member made of an annular elastic body that is elastically deformable according to a variable combustion pressure and is attached to a distal end of a gas hole of the gasket main body.

An outer peripheral fitting groove is formed in the seal member so that an end of the peripheral portion of the bore hole of the gasket main body is fitted, and a bottom surface of the outer peripheral fitting groove and a distal end of the peripheral portion of the bore hole of the gasket main body are formed. A gap is formed between them to absorb the difference in thermal expansion.

An outer peripheral fitting groove is formed in the seal member so that a peripheral end of the bore hole of the gasket main body is fitted. The gasket main body is fitted in the outer peripheral fitting groove of the seal member. The outer shape of the seal member is formed, and the seal member is attached to the gasket main body by crushing the seal member.

In the seal member, a portion near a bolt hole through which a bolt for fixing the cylinder head to the cylinder block penetrates is formed thinner by changing the thickness more smoothly than other portions.

In this gasket, the gasket main body is made of an outer elastic metal plate, and the seal member is made of an elastically deformable ring-shaped seal member having a gas hole corresponding to the hole, and the gasket body is in a fastened state of the parts. The ring-shaped seal member is elastically deformed in accordance with the deflection of the opposed parts, thereby ensuring uniform sealing surface pressure by uniformizing the tightening load distribution around the gas holes.

The ring-shaped sealing member is formed in an oval shape having a cross section that is thicker on the inner peripheral side than on the outer peripheral side, and the ring-shaped sealing member is bent in accordance with the bending of the opposing parts in the fastened state of the parts. The ring-shaped sealing member is elastically deformed so as to form a sealing surface that comes into surface contact with the component.

The ring-shaped sealing member and the outer elastic metal plate are provided with an adhesive capable of filling the irregularities by entering into the irregularities by machining existing on the opposing surface of the component and adhering without detaching. Coated, the adhesive maintains a mutual connection against a small horizontal movement relative to the component to ensure a sealing function. Further, the adhesive coated on the ring-shaped seal member is made of an organic material or a soft metal material.

The ring-shaped seal member is formed of a solid elastic metal member or a hollow elastic metal member. Or,
The ring-shaped seal portion is composed of a hollow elastic metal member and an elastic body formed of the hollow elastic metal member and filled in a hollow portion.

The ring-shaped seal member has a rounded square corner. Further, the ring-shaped seal member is formed by forging an elastic metal.

The ring-shaped sealing member is provided for sealing around the bore hole, has an outer shape formed in an oval cross section, and has a structure in which a coil spring is built in, that is, wrapped around the inside. The ring-shaped seal portion is elastically deformed in accordance with the bending of the component in the fastened state of the component,
The ring-shaped sealing member is adapted to form a sealing surface that comes into surface contact with the component. Further, the coil spring is formed of an endless ring-shaped coil spring. Further, the ring-shaped seal member is applied to a structure in which a groove is not provided in a cylinder head or a cylinder block, and is preferably applied between components having a structure in which a facing surface is formed as a flat surface. Things.

[0020] The outer elastic metal plate is constituted by a bead plate provided with a bead.

The part incorporating the gasket is constituted by a cylinder block and a cylinder head attached to the cylinder block, or is constituted by a cylinder head and an exhaust manifold or an intake manifold attached to the cylinder head. Have been.

Since the gasket is configured as described above, even if the distribution of the surface pressure around the gas hole such as the bore hole transmitted from the bolt axial force becomes uneven, the gasket surface pressure is made uniform. Since the ring-shaped seal member is elastically deformed following the fluctuating combustion pressure generated by the combustion of the engine, the sealing performance around the bore hole during the combustion of the engine can be ensured.

In general, in a gasket, the load and the surface pressure around the bore hole are not uniform because of differences depending on the location of the fastening bolt, the structure of the gasket, and the rigidity of the cylinder head, cylinder block or manifold. Therefore, this gasket solves the problem that the load around the bore hole in the fastened state becomes uneven, and provides a ring-shaped seal member that is elastically deformed by the fluctuating combustion pressure generated by the combustion of the engine. In order to increase the contact area between the opposing surfaces of the surrounding gaskets as compared with the conventional gasket and reduce the surface pressure value per unit area, an elastic ring having an oval cross section is a preferable shape. Looking at the load distribution around the bore hole of the gasket, the tightening load is large near the bolt, but the tightening load tends to be small between the bolts, especially between the bore holes, so that the sealing surface pressure decreases.

Also, in the gasket, the bore of the cylinder head becomes larger in the tightened state than the other outer peripheral portion, the water hole, the oil hole, and the like. The contact between the gasket and the surface of the cylinder head tends to result in an inclined fastening state, which causes a reduction in the seal width of the gasket. In this gasket, since the ring-shaped sealing member is formed in an oval cross section, the gasket fits smoothly according to the inclination of the cylinder head at the time of fastening as described above, and stably secures necessary surface pressure. be able to.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a gasket according to the present invention will be described with reference to the drawings. This gasket is used to seal between the flat opposing surfaces of parts of the engine with gas holes which are arranged opposite each other.
It is applied between the opposing surfaces. The facing surfaces of the parts into which the gasket is incorporated are between the facing surfaces of the cylinder block and the cylinder head, or between the facing surfaces of the cylinder head and the manifolds of the exhaust manifold and the intake manifold.

FIG. 1 shows a structure in which the gasket is applied between opposing surfaces of a cylinder block and a cylinder head. This gasket is provided with a ring-shaped seal member 1 having a gas hole 3 forming a bore hole corresponding to a hole portion of a cylinder head or a cylinder block, and a ring-shaped seal member 1 arranged in an outer region of the ring-shaped seal member 1. And an outer elastic metal plate 2 connected to the outer elastic metal plate 2. In the ring-shaped seal member 1, a connecting portion 4 connected to the outer elastic metal plate 2 is provided in the entire outer periphery or at a plurality of locations (FIG. 1).
In four places). Also, beads such as half beads 33 are formed on the outer elastic metal plate 2. This gasket has a large number of holes such as bolt holes 5 and water holes 6.

FIG. 2 shows a structure in which the gasket is applied between opposing surfaces of a cylinder head and a manifold. The gasket shown in FIG. 2 has gas holes 9 forming exhaust gas holes or air holes in the ring-shaped sealing member 1A corresponding to the gas holes of the cylinder head and the manifold.
Are formed, and a bolt hole 8 is formed in the flange portion 7 constituting the outer elastic metal plate 2A of the ring-shaped seal member 1A. An outer elastic metal plate 2 is provided on the ring-shaped sealing member 1A.
The connecting portions 4 connected to A are formed in the entire outer peripheral region or at a plurality of locations (four locations in FIG. 1).

Next, with reference to FIG. 3, the shape of a ring-shaped sealing member 1B which is a first embodiment of the gasket according to the present invention will be described. FIG. 3 is a sectional view of a portion corresponding to the AA section in FIG. 1 or FIG. This gasket
It has an elastically deformable ring-shaped seal member 1B having gas holes 3 and 9, and an outer elastic metal plate 2 arranged in the outer region of the ring-shaped seal member 1B and connected to the ring-shaped seal member 1B. The ring-shaped sealing member 1B is turned into a ring-shaped sealing member
Is elastically deformed to secure uniform sealing surface pressure by uniformizing the tightening load distribution around the gas holes 3. The ring-shaped sealing member 1B has a thickness L on the inner peripheral side, that is, the gas hole 3 side.
The outer shape of the cross section in which 1 is thicker than the thickness L2 on the outer peripheral side is formed in an oval-shaped solid structure. The ring-shaped sealing member 1B is elastically deformed in accordance with the bending of the opposing component when the component is fastened, so that the ring-shaped sealing member 1B forms a sealing surface that comes into surface contact with the component.

Referring to FIG. 4, the shape of a ring-shaped seal member 1C as a second embodiment of the gasket according to the present invention will be described. FIG. 4 is a sectional view of a portion corresponding to the AA section in FIG. 1 or FIG. The ring-shaped seal member 1C shown in FIG. 4 is the same as the ring-shaped seal member 1B shown in FIG. It has a structure and a function. The ring-shaped sealing member 1B has the function of an air cushion when the hollow portion 14 is sealed, but has the same material as the ring-shaped sealing member 1 when the hollow portion 14 is not sealed. In this case, the elastic force is low. In the second embodiment, the ring-shaped seal member 1B and the outer elastic metal plates 2 and 2A are capable of filling the irregularities by entering into the irregularities by machining existing on the opposing surfaces of the parts and not sticking to the irregularities. Agent 4
6 and 47 are entirely or partially covered, and are provided with an adhesive 4 against minute horizontal movement relative to the component.
6, 47 can maintain the mutual connection and secure the sealing function, and the periphery of the bore holes 3, 9 is more excellent in the portions other than the bore holes 3, 9 in combination with the action of the ring-shaped sealing member 1B. A secure sealing function is ensured. Further, the adhesives 46 and 47 can be made of an organic material or a soft metal material. When the adhesives 46 and 47 are organic materials, for example, a heat-resistant, plastically deformable, and non-curable urethane polymer material can be used (see, for example, Japanese Patent Application No. 10-323809). In addition, the adhesive 46, 4
When 7 is a soft metal material, for example, aluminum, an aluminum alloy, or the like can be used.

Referring to FIG. 5, a third embodiment of the ring-shaped sealing member will be described. FIG. 5 is a sectional view of a portion corresponding to the AA section in FIG. 1 or FIG. The ring-shaped sealing member 1D shown in FIG. 5 is different from the ring-shaped sealing member 1A shown in FIG.
It has the same structure and function except that the structure is filled with the filler 13. Ring-shaped sealing member 1
D can adjust the elastic force by selecting the material of the filler 13 to be filled into the hollow portion 14, and can appropriately adjust the filler in accordance with the applied parts as compared with the ring-shaped seal member 1B or 1C. Thirteen materials can be selected, which improves the degree of freedom in design.

Next, with reference to FIG. 6, a description will be given of a connection structure between a ring-shaped sealing member 1E and outer elastic metal plates 2, 2A which is a fourth embodiment of the gasket according to the present invention. FIG.
3 is a cross-sectional view of a portion corresponding to a BB cross section in FIG. 1 or FIG. In FIG. 6, the outer elastic metal plates 2, 2 of FIG.
A is composed of a pair of laminated outer elastic metal plates 2B and 2C. A step portion 30 is formed on the outer elastic metal plate 2B to hold the connecting portion 4 of the ring-shaped seal member 1E, and a holding portion 29 is formed. The ring-shaped sealing member 1E and the outer elastic metal plate 2B are connected to each other by a connection member 15 made of resin or soft metal. Further, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plates 2B and 2C.

Referring to FIG. 7, a description will be given of a connection structure between a ring-shaped sealing member 1F and outer elastic metal plates 2 and 2A, which is a fifth embodiment of the gasket according to the present invention. FIG. 7 shows FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to a BB cross section in FIG. 2.
In FIG. 7, the outer elastic metal plates 2, 2A of FIG. 1 or FIG.
It is composed of one outer elastic metal plate 2D. The outer elastic metal plate 2D is connected to the ring-shaped sealing member
F is connected by welding as shown by reference numeral 16. A step 31 is formed on the outer elastic metal plate 2D for welding at the connecting portion 4 of the ring-shaped seal member 1F.
1 has a bead function. In addition, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plate 2D.

Referring to FIG. 8, a description will be given of a connection structure between a ring-shaped sealing member 1F and outer elastic metal plates 2, 2A, which is a sixth embodiment of the gasket according to the present invention. FIG. 8 shows FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to a BB cross section in FIG. 2.
In FIG. 8, the outer elastic metal plates 2, 2A of FIG. 1 or FIG.
It is composed of a pair of outer elastic metal plates 2E. The outer elastic metal plate 2E is connected to the ring-shaped sealing member
In order to sandwich F, beads 17 having elastic force with convex portions facing each other are formed. The outer elastic metal plate 2E is
The connection portion 4 of the ring-shaped seal member 1F is fixed by a material 18 such as rubber or resin. The material 18 such as rubber or resin is composed of the outer elastic metal plate 2E and the ring-shaped seal member 1.
It has the function of sealing the boundary with F. Further, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plate 2E.

Next, each embodiment will be described with reference to FIGS. The gasket shown in FIGS. 9 to 16 is basically formed in the shape shown in FIG. 9 around the entire circumference of the bore holes 3 and 9, but according to FIG. 1 or FIG.
It shows a portion corresponding to the A section.

Referring to FIG. 9, a description will be given of a connection structure between a ring-shaped sealing member 1G and outer elastic metal plates 2 and 2A, which is a seventh embodiment of the gasket according to the present invention. FIG. 9 shows FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to an AA cross section in FIG. 2.
In FIG. 9, the outer elastic metal plates 2, 2A of FIG. 1 or FIG.
It is composed of one outer elastic metal plate 2F. The outer elastic metal plate 2F is fixed by a material 18 such as rubber or resin at a boundary with the ring-shaped seal member 1G. The material 18 such as rubber or resin has a function of sealing the boundary between the outer elastic metal plate 2F and the ring-shaped sealing member 1G. Further, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plate 2F.

Referring to FIG. 10, a description will be given of a connection structure between a ring-shaped seal member 1H and outer elastic metal plates 2, 2A according to an eighth embodiment of the gasket according to the present invention. FIG. 10 is a sectional view of a portion corresponding to the AA section in FIG. 1 or FIG. In FIG. 10, the outer elastic metal plates 2, 2 of FIG.
A is a pair of outer elastic metal plates 2G, 2
H. The outer elastic metal plate 2H forms a ring portion 19 of the ring-shaped seal member 1H in which the edges of the gas holes 3, 9 are bent in a circular shape along the gas holes 3, 9. The ring-shaped seal member 1H includes a ring portion 19 and an elastic ring 20 disposed in a hollow portion 27 formed by the ring portion 19. In addition, the outer elastic metal plate 2G has a structure in which a gap 21 is formed between its edge and the ring portion 19, and an elastic force is applied to the ring portion 19. Further, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plates 2G and 2H.

Referring to FIG. 11, a description will be given of a connection structure between a ring-shaped sealing member 1J and outer elastic metal plates 2, 2A according to a ninth embodiment of the gasket according to the present invention. FIG. 11 is a sectional view of a portion corresponding to the AA section in FIG. 1 or FIG. In FIG. 11, the outer elastic metal plates 2, 2 of FIG.
A is composed of a pair of outer elastic metal plates 2J stacked on each other. The outer elastic metal plate 2J has its edge 2
Numeral 3 constitutes gas holes 3 and 9, and has a structure including a bead 22 having convex portions oriented in opposite directions along the gas holes 3 and 9. Therefore, the ring-shaped sealing member 1
J is a pair of beads 22 having elastic force facing in opposite directions.
And an elastic ring 20 disposed in a hollow portion 28 formed by a pair of beads 22. In addition, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plate 2J.

Referring to FIG. 12, a description will be given of a connection structure between a ring-shaped sealing member 1K and outer elastic metal plates 2, 2A, which is a tenth embodiment of the gasket according to the present invention. FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to the AA cross section in FIG. 1 or 2. In FIG. 12, the outer elastic metal plate 2 of FIG.
2A is constituted by a pair of outer elastic metal plates 2K stacked on each other and an outer elastic metal plate 2L constituting an intermediate plate. Further, the ring-shaped seal member 1K includes a ring body 24 sandwiching the intermediate plate 2L and an elastic ring 20 disposed in a hollow portion 32 formed in the ring body 24. A rubber or resin material 18 is provided between the outer edge 35 of the ring body 24 and the inner edge 36 of the outer elastic metal plate 2K.
Are fixedly arranged, and the material 18 performs a sealing function between them. Further, the outer elastic metal plate 2K has an intermediate plate 2L.
Bead 37 extending in a direction away from each other. The ring-shaped seal member 1K has gas holes 3 and 9. Further, a bead such as a half bead 33 (FIG. 1) can be appropriately formed on the outer elastic metal plate 2K.

Referring to FIG. 13, a description will be given of a connection structure between a ring-shaped seal member 1L and outer elastic metal plates 2 and 2A as an eleventh embodiment of the gasket according to the present invention. FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to the AA cross section in FIG. 1 or 2. In FIG. 13, the outer elastic metal plate 2 of FIG.
2A is composed of one outer elastic metal plate 2, 2A. Further, the ring-shaped sealing member 1L is
And an elastic ring 20 disposed in a hollow portion 34 formed by the ring body 25. The ring body 25 of the ring-shaped sealing member 1L is made of an outer elastic metal plate 2, 2A.
Are fixed to each other by a joining material 26 such as welding or rubber. Also, a bead such as a half bead 33 can be appropriately formed on the outer elastic metal plates 2 and 2A.

Referring to FIG. 14, a connection structure between a ring-shaped sealing member 1M, which is a twelfth embodiment of the gasket according to the present invention, and outer elastic metal plates 2, 2A of the gasket body will be described. FIG. 14 is a sectional view of a portion corresponding to the AA section in FIG. 1 or FIG. In FIG. 14, the outer elastic metal plates 2 and 2A of FIG. 1 or FIG.
A. Also, a ring-shaped sealing member 1M
In the outer peripheral surface 41, an outer peripheral fitting groove 38 is formed on the outer elastic metal plate 2, in which the tip 43 of the bore hole peripheral portion 39 of the outer elastic metal plate 2, 2A is fitted. , 2
A gap 40 is formed between the bore A and the front end 43 of the peripheral portion 39 to absorb a difference in thermal expansion. In the twelfth embodiment, deformation due to thermal expansion and thermal contraction of the gasket main body generated during operation of the engine is absorbed by the gap 40, and damage to the ring-shaped seal member 1M is prevented.

Referring to FIG. 15, a description will be given of a connection structure between a ring-shaped sealing member 1N and outer elastic metal plates 2 and 2A, which is a thirteenth embodiment of the gasket according to the present invention. FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to the AA cross section in FIG. 1 or 2. In FIG. 15, the outer elastic metal plate 2 of FIG.
2A is composed of one outer elastic metal plate 2, 2A. Further, the ring-shaped seal member 1N has 41
The outer peripheral fitting groove 38 is formed in the outer elastic metal plate 2, 2 </ b> A to be fitted with a peripheral hole distal end 43. While the outer elastic metal plates 2 and 2A are fitted in the outer peripheral fitting groove 38 of the seal member 1N, the outer contour 44 of the seal member 1N is formed, and the seal member 1N is crushed to form the seal member 1N.
Are attached to the outer elastic metal plates 2, 2A.

Referring to FIG. 16, a description will be given of a connection structure between a ring-shaped sealing member 1P and outer elastic metal plates 2 and 2A, which is a fourteenth embodiment of the gasket according to the present invention. FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to the AA cross section in FIG. 1 or 2. In FIG. 16, the outer elastic metal plate 2 of FIG.
2A is composed of one outer elastic metal plate 2, 2A. In the ring-shaped seal member 1P, an outer peripheral fitting groove 38 is formed on the outer peripheral surface 41 so that the distal end 43 of the outer elastic metal plate 2, 2A around the bore hole is fitted. With the outer elastic metal plates 2 and 2A fitted in the outer peripheral fitting grooves 38 of the seal member 1P, the seal member 1P is attached to the outer elastic metal plates 2 and 2A by crushing into the R shape of the outer shape 44 of the seal member 1P. I have. During this processing, the outer contour 45 such as the oval shape of the ring-shaped seal member 1P can be simultaneously formed.

In the conventional gasket, the stoppers such as the shim plate and the ring are fixed to the gasket body by welding or the like. However, in the embodiments shown in FIGS. 15 and 16, the seal members 1N,
Since 1P is attached to the outer elastic metal plates 2 and 2A by crushing, the molding and fixing of the seal members 1N and 1P can be performed simultaneously, thereby reducing the number of processing steps and the manufacturing cost.

Referring to FIG. 17, the thickness of the gasket according to the fifteenth embodiment of the present invention in the circumferential direction of the ring-shaped sealing member 1 will be described. FIG. 17 is a cross-sectional view of a portion corresponding to the BB cross section of FIG. 1 or FIG. FIG.
Now, the outer elastic metal plates 2, 2A and the ring-shaped sealing member 1
Are shown. In the seal member 1, a portion near the bolt hole 5 through which a bolt for fixing the cylinder head to the cylinder block penetrates is formed thinner by changing the thickness more smoothly than other portions. When the gasket is fastened to the cylinder block and the cylinder head with the bolts 5, the portions near the bolts 5 are strongly tightened, and the gaskets tend to be hardly tightened between the bolts 5 and between the bore holes 3. In order to improve the tightness between the bolts 5, the ring-type gasket slightly crushes, for example, about 10 to 20 μm in a region near the bolt 5 (in FIG. 17, the area of the angle θ) to reduce the thickness. The thickness is changed smoothly so that the step near the side of the bolt 5 has a smaller thickness than that between the bolt 5 and the bore hole 3. The gasket can improve the tightening property between the bolts 5 and the bore holes 3 by the above configuration, can prevent the opening between the cylinder head and the cylinder block, and can uniform the surface pressure distribution.
The sealing performance can be improved, the local contact of the bolt 5 near the side can be prevented, and the deformation of the bore 3 can be reduced.

[0045]

Since the gasket according to the present invention is constructed as described above, the gasket is fastened between the opposing surfaces between the cylinder head and the cylinder block or between the opposing surfaces between the cylinder head and the manifold. In accordance with the bending, the ring-shaped sealing member sufficiently fills the bending, makes the surface pressure between the opposing surfaces uniform, and improves the sealing performance.
In the gasket, the ring-shaped sealing member has an elastic force between the opposing surfaces of the component, the component being bent or drooping with the aging when the components are fastened to each other or with the operation of the engine. Therefore, the above-mentioned bending at the time of tightening or warping due to aging, etc., can be sufficiently filled by the elastic force of the ring-shaped sealing member, and a proper surface pressure is always secured between the parts. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a part of an embodiment having a structure in which a gasket according to the present invention is applied to a cylinder head gasket.

FIG. 2 is a schematic plan view showing a part of an embodiment having a structure in which a gasket according to the present invention is applied to a manifold gasket.

FIG. 3 shows a first embodiment of the gasket according to the present invention, and is a cross-sectional view of a portion corresponding to a cross section taken along line AA of FIG. 1 or FIG.

FIG. 4 is a sectional view showing a second embodiment of the gasket according to the present invention and corresponding to a section taken along line AA of FIG. 1 or FIG. 2;

5 shows a third embodiment of the gasket according to the present invention, and is a cross-sectional view of a portion corresponding to a cross section taken along line AA of FIG. 1 or FIG.

FIG. 6 is a sectional view showing a fourth embodiment of the gasket according to the present invention and corresponding to a section taken along line BB of FIG. 1 or FIG. 2;

FIG. 7 shows a fifth embodiment of the gasket according to the present invention, and is a cross-sectional view of a portion corresponding to the BB cross section of FIG. 1 or FIG.

8 shows a sixth embodiment of the gasket according to the present invention, and is a cross-sectional view of a portion corresponding to the BB cross section of FIG. 1 or FIG.

FIG. 9 is a cross-sectional view of a portion corresponding to a cross section taken along line AA of FIG. 1 or FIG. 2, showing a seventh embodiment of the gasket according to the present invention.

FIG. 10 is a sectional view showing a gasket according to an eighth embodiment of the present invention, corresponding to a section taken along line AA of FIG. 1 or FIG. 2;

FIG. 11 is a sectional view showing a ninth embodiment of the gasket according to the present invention, which is a portion corresponding to a section taken along line AA of FIG. 1 or FIG.

FIG. 12 is a cross-sectional view showing a tenth embodiment of the gasket according to the present invention, which corresponds to a cross section taken along line AA of FIG. 1 or FIG.

FIG. 13 is a cross-sectional view of a portion corresponding to the AA cross section of FIG. 1 or FIG. 2 showing an eleventh embodiment of the gasket according to the present invention.

FIG. 14 is a sectional view showing a twelfth embodiment of the gasket according to the present invention and corresponding to a section taken along line AA of FIG. 1 or FIG.

FIG. 15 shows a thirteenth embodiment of the gasket according to the present invention, and is a cross-sectional view of a portion corresponding to the AA cross section of FIG. 1 or FIG.

FIG. 16 is a cross-sectional view of a portion corresponding to a cross section taken along the line AA of FIG. 1 or FIG. 2, showing a fourteenth embodiment of the gasket according to the present invention;

FIG. 17 is a plan view illustrating a fifteenth embodiment of the gasket according to the present invention.

[Explanation of symbols]

1, 1A, 1B, 1C, 1D Ring seal member 1E, 1F, 1G, 1H, 1J, 1K, 1L Ring seal member 2, 2A, 2B, 2C, 2D Outer elastic metal plate 2E, 2F, 2G, 2H , 2J, 2K, 2L Outer elastic metal plate 3 Gas hole (bore hole) 4 Connecting portion 5, 8 bolt hole 6 Water hole 7 Flange portion 9 Gas hole (exhaust gas hole, air hole) 10, 12 Ring body 11, 14 , 27, 28, 32, 34 Hollow part 13 Filler 15 Resin, soft metal connecting material 16, 26 Welded part 17, 37 Bead 18 Material such as rubber or resin 19 Ring part 20 Elastic ring 21 Gap 22 Bead 23 Edge Portion 24, 25 Ring body 29 Nipping portion 30, 31 Step portion 33 Half bead 35 Outer edge 36 Inner edge 38 Outer fitting groove 39 Bore hole peripheral portion 40 Gap 41 Outer peripheral surface 43 Tip 4,45 outer contour 46, 47 adhesive

Continued on the front page (72) Inventor Masahiko Miura 2-1-1 Kano, Higashi-Osaka-shi, Osaka Japan Gasket Co., Ltd. (72) Inventor Tetsu Yasuki 1-Toyota-cho, Toyota City, Aichi Prefecture Toyota Motor Corporation F term (reference) 3J040 AA01 AA12 BA01 EA08 EA15 EA17 EA21 EA22 EA26 EA30 EA48 FA01 FA05 HA01 HA17 HA20

Claims (17)

[Claims] 1. A gasket applied between two flat surfaces of a component having holes for gas used in an engine, the flat surface being used for sealing between the flat surfaces. A sealing member made of an annular elastic body elastically deformable following a fluctuating combustion pressure attached to a distal end of a gas hole of the gasket main body;
A gasket comprising: 2. The seal member is formed with an outer peripheral fitting groove into which a peripheral end of the bore hole of the gasket main body is fitted, and a bottom surface of the outer peripheral fitting groove and a distal end of the peripheral portion of the bore hole of the gasket main body. 2. The gasket according to claim 1, wherein a gap is formed between the gasket and the gap to absorb a difference in thermal expansion. 3. The seal member is formed with an outer peripheral fitting groove into which a tip of a peripheral portion of the bore hole of the gasket main body is fitted, and the gasket main body is fitted into the outer peripheral fitting groove of the seal member. 2. The gasket according to claim 1, wherein the outer shape of the seal member is formed by squeezing, and the seal member is attached to the gasket main body by crushing the seal member. 4. The sealing member according to claim 1, wherein a portion near a bolt hole through which a bolt for fixing the cylinder head to the cylinder block penetrates is formed thinner by changing the thickness more smoothly than other portions. The gasket according to claim 1, characterized in that: 5. The gasket main body is formed of an outer elastic metal plate, and the seal member is formed of an elastically deformable ring-shaped seal member having a gas hole corresponding to the hole, and the parts are opposed to each other in a fastened state. The ring-shaped sealing member is elastically deformed in response to the bending of the component, thereby ensuring uniform sealing surface pressure by uniformizing a tightening load distribution around the gas hole. Gasket. 6. The ring-shaped sealing member is formed in an oval shape having a cross section that is thicker on an inner peripheral side than on an outer peripheral side, and the ring is formed in accordance with a bending of the facing component in a fastened state of the component. The gasket according to claim 5, wherein the ring-shaped sealing member is elastically deformed so that the ring-shaped sealing member is formed to form a sealing surface which comes into surface contact with the component. 7. An adhesive capable of filling the irregularities by entering into the irregularities due to machining existing on the opposite surface of the component and not sticking to the ring-shaped seal member and the outer elastic metal plate. 6. The gasket of claim 5, wherein the adhesive is coated and the adhesive maintains a mutual bond to ensure a sealing function against small horizontal movements relative to the component. . 8. The gasket according to claim 5, wherein the adhesive coated on the ring-shaped seal member is made of an organic material or a soft metal material. 9. The gasket according to claim 5, wherein the ring-shaped seal member is formed of a solid elastic metal member or a hollow elastic metal member. 10. The ring-shaped sealing member according to claim 5, wherein the ring-shaped sealing member comprises a hollow elastic metal member and an elastic body filled in a hollow formed by the hollow elastic metal member. gasket. 11. The gasket according to claim 5, wherein the ring-shaped seal member has a rounded square corner. 12. The ring-shaped sealing member is formed by forging an elastic metal.
The gasket described in the above. 13. The ring-shaped sealing member has an outer shape formed in an oval cross-section, and has a coil spring built therein.
The ring-shaped seal portion is elastically deformed in accordance with the bending of the component in a fastened state of the component, and is applied so that the ring-shaped seal member forms a sealing surface that comes into surface contact with the component. The gasket according to claim 5, characterized in that: 14. The gasket according to claim 13, wherein the coil spring is formed from an endless ring-shaped coil spring. 15. The gasket according to claim 5, wherein the outer elastic metal plate comprises a bead plate having a bead. 16. The gasket according to claim 1, wherein the component comprises a cylinder block and a cylinder head mounted on the cylinder block. 17. The gasket according to claim 1, wherein the component comprises a cylinder head and an exhaust manifold or an intake manifold attached to the cylinder head.