JPH06300139A - Suction and exhaust gasket - Google Patents

Abstract

PURPOSE:To perform simultaneous sealing of two suction and exhaust holes by a method wherein a core is positioned astride a portion between the two suction and exhaust holes of the cylinder head of an engine and different sealants are arranged to the core. CONSTITUTION:An intermediate plate 3 with which suction and exhaust holes 1 and 2 are covered is arranged. A sheet 4 and a resilient layer 6 are arranged in the suction hole 1 and a plurality of steel sheets 5 are laminated in the exhaust hole 2 for integral formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket which seals between flanges of an internal combustion engine, and more specifically, is mounted on a flange portion of a cylinder head having a counterflow type intake hole and an exhaust hole in the same direction. Intake and exhaust gaskets.

[0002]

2. Description of the Related Art A conventional gasket used for a counterflow type engine uses a sealing material having compressive elasticity, such as asbestos-based or graphite-based, and presses a reinforcing metal plate on both sides thereof, or has the above structure. On the contrary, there is known a structure in which asbestos-based / graphite-based sealing material is pressure-welded to the front and back of the reinforcing metal plate. In addition, as a method of assembling the intake hole and the exhaust hole separately, a metal plate made of aluminum-plated steel plate or stainless steel plate is laminated on the exhaust side where the heat load is severe, and the surface pressure distribution is advantageous on the metal plate. It has been known that the bead molding or the like is performed, and on the other hand, on the intake side where the heat load is low, the seal portion is formed by the asbestos-based or graphite-based sealing material and these are integrally combined.

[0003]

However, when the asbestos-based or graphite-based sealing material is used for the exhaust hole as described above, the exhaust gas is at a high temperature, which causes a problem that thermal destruction occurs in the interlayer direction. Therefore, it is necessary to add a shape for improving heat resistance such as arranging a metal grommet at a position surrounding the opening of the exhaust port, resulting in an increase in cost. Moreover, since the aluminum cylinder head and the cast iron exhaust manifold move in the direction perpendicular to the tightening axial force due to thermal strain, the long-term life cannot be maintained, such as the gasket itself breaking at the go-stop of high-load operation of the engine. There was a flaw.

Further, in the case of a structure in which the intake and exhaust holes are combined as separate parts, the workability is inferior such that the stud bolts embedded in the cylinder head cannot be shared with the bolt holes of the intake and exhaust manifold, and the number of parts is increased. There was a management problem involved. In view of such drawbacks, the present invention has an object to provide an intake / exhaust gasket which is capable of coping with both intake and exhaust holes at the same time and has a good sealing performance and excellent assembling property.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, an intake hole (1) and an exhaust hole mounted between an intake manifold and an exhaust manifold of an internal combustion engine and a cylinder head. (2)
Is a laminated structure intake / exhaust gasket, wherein the intake / exhaust gasket comprises an intermediate plate (3) connected to the intake / exhaust holes (1) and (2) and serving as a core material, A thin plate (4) coated with an elastic layer (6) made of synthetic rubber or synthetic resin containing reinforcing fibers in a thickness of 50 μ to 300 μ is arranged on both surfaces of the intermediate plate (3) where the intake hole (1) is located. In addition, at least one or more thin steel plates (5) are laminated on both surfaces where the exhaust holes (2) are located, and these are integrated by bonding or welding.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the intake / exhaust gasket of the present invention comprises an intermediate plate (3), and a member for sealing the intake hole (1) and the exhaust hole (2) is integrally formed on the intermediate plate (3). As shown in FIG. 2, the intake hole (1) is provided with a plurality of thin plates (4), and an elastic layer (6) made of synthetic rubber or synthetic resin mixed with reinforcing fibers is formed on the surface thereof.
The elastic layer (6) is coated with a thickness of 0μ to 300μ, and this elastic layer (6) is made of aramid fiber or synthetic fiber with high heat resistance and mixed with a special inorganic filler such as a synthetic rubber or other asbestos-free sealing material. There is a method of forming at least. On the other hand, in the exhaust hole (2), a plurality of thin steel plates (5) having holes continuously provided are laminated on both surfaces of the intermediate plate (3). Further, the intermediate plate (3) is made of SUS steel plate, and the thin plate (4) is made of inexpensive iron plate (SPCC) of 0.2 to 10.
It is generally used with a thickness of about 0.7 mm, but it is also possible to combine it with another steel plate or a lightweight aluminum plate.

At this time, as shown in FIG. 2, at the openings of the intake hole (1) and the exhaust hole (2) formed of the thin plate (4) and the elastic layer (5), the beads (that surround the openings) are formed. When 7) is provided, the bead (7) can absorb the flange strain and enhance the sealing property, so that it can be an effective sealing means. The shape of this bead (7) is
The curved bead (7) formed on the intake hole (1) side shown in FIG.
1) and the partially curved bead (72) on the side of the exhaust hole (2), the protruding bead (73) shown on the side of the intake hole (1) in FIG. Edge bead (7
4), or the multi-curved bead (75) shown in FIG. 4 or the like can be implemented. Further, as shown in FIG. 5, the bent portion (8) is formed by folding back the opening of the thin plate (4) to a size substantially the same as or slightly larger than that of the opening of the intermediate plate (3).
It is also possible to model. With these structures, it is possible to obtain a gasket having not only absorption of the flange strain but also effective absorption of lateral flow phenomenon due to thermal expansion.

[0008]

As described above, according to the present invention, in a gasket having intake / exhaust holes (1) and (2) on the same flange surface, which greatly differ in required sealing performance, different sealing materials are individually arranged and required. The performance is completely satisfied,
In addition, the intermediate plate (3), which serves as the sealing base material for both sealing points, integrates these to realize accurate positioning and quick and reliable mounting, and good followability even under high load operation. It is an excellent gasket that maintains a long life as shown.

[0009]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an intake / exhaust gasket of the present invention.

FIG. 2 is a schematic sectional view showing an intake / exhaust gasket of the present invention in an easy-to-understand manner.

FIG. 3 is a schematic cross-sectional view showing another embodiment of the present invention.

[0010]

[Explanation of symbols]

 1 Intake hole 2 Exhaust hole 3 Intermediate plate 4 Thin plate 5 Thin steel plate 6 Elastic layer 7 Bead 8 Bent part

[Procedure amendment]

[Submission date] April 14, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 4

[Correction method] Added

[Correction content]

FIG. 4 is a schematic sectional view showing an embodiment of the present invention.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 5

[Correction method] Added

[Correction content]

FIG. 5 is a schematic sectional view showing another embodiment of the present invention.

Claims (3)

[Claims] 1. An intake / exhaust gasket having a laminated structure integrally having an intake hole (1) and an exhaust hole (2) mounted between an intake manifold and an exhaust manifold of an internal combustion engine and a cylinder head; The intake / exhaust gasket has an intermediate plate (3) connected to the intake / exhaust holes (1) and (2), and reinforcing fibers are mixed on both sides of the intermediate plate (3) where the intake holes (1) are located. The elastic layer (6) made of synthetic rubber or synthetic resin is 50 μ-300
A thin plate (4) coated with a thickness of μ is provided, and at least one thin steel plate (5) is laminated on both surfaces where the exhaust hole (2) is located, and these are integrated. Intake and exhaust gaskets. 2. The heat insulating gasket according to claim 1, wherein a bead (7) surrounding each of the openings of the intake hole (1) and the exhaust hole (2) is provided. 3. The bent portion (7) of the thin steel plate (5) formed in the exhaust hole (3) is folded to a size substantially the same as or slightly larger than the opening of the intermediate plate (3). 4. The intake / exhaust gasket according to claim 1, wherein the intake / exhaust gasket is molded.