JP2847443B2 - Intake and exhaust gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for sealing between flanges of an internal combustion engine, and more particularly to a counterflow type cylinder head having an intake hole and an exhaust hole in the same direction. The present invention relates to an intake / exhaust gasket attached to a flange portion.

[0002]

2. Description of the Related Art A conventional gasket used for a counterflow type engine uses a sealing material having compression elasticity such as asbestos or graphite , and a reinforcing metal plate is pressed against both surfaces thereof, or the structure described above is used. On the contrary, there is known a structure in which a sealing material such as asbestos or graphite is pressed against the front and back of a reinforcing metal plate. Also, as a method of assembling the intake hole and the exhaust hole as separate bodies, a metal plate made of aluminum-plated steel plate or stainless steel plate is laminated on the exhaust side where the thermal load is severe , and the surface pressure distribution on the metal plate is advantageous. On the other hand, there has been known a structure in which a sealing portion is formed with the asbestos-based or graphite-based sealing material on the intake side having a low thermal load, and these are integrally combined with each other.

[0003]

However, when an asbestos-based or graphite-based sealing material is used for the exhaust hole as described above, the exhaust gas is at a high temperature, causing a problem of causing thermal destruction in the interlayer direction. Therefore, it is necessary to add a heat-resistant shape such as arranging a metal grommet at a position surrounding the opening of the exhaust port, thereby increasing the cost. In addition, since the aluminum cylinder head and the cast iron exhaust manifold move in the direction perpendicular to the tightening axial force due to thermal distortion, the gasket itself cannot be maintained for a long time, such as when the gasket is cut off when the engine is under high load operation. There were drawbacks.

In the case of a structure in which the intake and exhaust holes are combined as separate parts, the workability is inferior, for example, stud bolts embedded in the cylinder head cannot be shared with the bolt holes of the intake and exhaust manifolds, and the number of parts is increased. There was an accompanying management problem. The present invention has been made in view of such a drawback, allowed corresponds simultaneously to the intake and exhaust both holes, and its object is to provide a intake and exhaust gasket sealing performance excellent good assemblability.

[0005]

The present invention will be described with reference to the drawings. As shown in FIG. 1, an intake port (1) and an exhaust port are provided between an intake manifold and an exhaust manifold of an internal combustion engine and a cylinder head. (2)
And a gasket having a laminated structure composed of a plurality of plate members integrally having a gasket, wherein the gasket includes an intermediate plate (3) serving as a core member connected to the respective suction / exhaust holes (1) and (2). and provided, on both sides of the intermediate plate (3) located in the air inlet (1) it is complementary to the synthetic rubber or synthetic resin
Mix strong fiber and coat it with a thickness of 50μ ~ 300μ.
A metal thin plate (4) having a resilient layer (6) formed thereon, and at least one or more thin steel plates (5) disposed on both sides of the exhaust hole (2) ;
Inlet (1) and exhaust hole in thin plate (4) and thin steel plate (5)
(2) is continuously milled, and these thin plates (4) and thin
The steel plate (5) is integrated with the intermediate plate (3) by bonding or welding.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, the intake / exhaust gasket of the present invention has an intermediate plate (3), and the intermediate plate (3) has an optimal member for sealing the intake port (1) and the exhaust port (2).
As shown in FIG. 2, an 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 provided on the surface thereof. ) a coating with a thickness of 50μ~300μ
And allowed to form, the elastic layer (6) is such formed brought mixed into the sealing material that does not contain asbestos, such as synthetic rubber with using a high aramid fiber or synthetic fiber heat resistance, which special inorganic fillers such as There is a way. On the other hand, in the exhaust hole (2), a plurality of thin steel plates (5) having holes formed continuously on both surfaces of the intermediate plate (3) are laminated. Generally, the intermediate plate (3) is made of a SUS steel plate, and the thin plate (4) is made of an inexpensive iron plate (SPCC) having a thickness of about 0.2 to 0.7 mm. But other steel plates or lightweight
It is also possible to combine an aluminum plate with this.

[0007] bead this time, the respective openings of the thin plate as shown in FIG. 2 (4) and the elastic layer suction holes consisted (5) (1) and an exhaust hole (2), surrounding the opening By providing (7), the bead (7) can absorb flange distortion and enhance the sealing property, so that it can be an effective sealing means. As the shape of the bead (7), a curved bead (71) formed on the intake hole (1) side and a partially curved bead (72) formed on the exhaust hole (2) side shown in FIG.
And the like, a protruding bead (73) shown on the intake hole (1) side in FIG. 3, a single bend bead (74) on the exhaust hole (2) side thereof, or a multi-bead bead shown in FIG. (7
5) can be implemented. Further, as shown in FIG. 5, the opening of the thin plate (4) can be folded back to the same size as or slightly larger than the opening of the intermediate plate (3) to form the bent portion (8). . With these structures,
It is possible to obtain a gasket having not only the flange distortion absorption but also an effective absorption performance against a lateral flow phenomenon due to thermal expansion.

[0008]

As described above, according to the present invention, in a gasket having suction and exhaust holes (1) and (2) having greatly different sealing performances required on the same flange surface, different sealing materials are individually arranged and each hole is formed. perfectly allowed satisfy respective required performance, besides by integrating them by an intermediate plate (3) comprising a sealing base material of both the seal portion, which has achieved accurate positioning and rapid and reliable mounting, It is an excellent gasket that maintains a long life, such as exhibiting good followability even under high load operation.

[Brief description of the drawings]

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

FIG. 2 is a schematic sectional view showing the intake and exhaust gasket of the present invention for easy understanding.

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

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

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

[Explanation of symbols]

 DESCRIPTION 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

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16J 15/00-15/14

Claims (3)

(57) [Claims] An intake / exhaust gasket having a laminated structure integrally having an intake port (1) and an exhaust port (2) mounted between an intake manifold and an exhaust manifold of an internal combustion engine and a cylinder head; Each of the intake and exhaust gaskets has an intake and exhaust hole (1).
An intermediate plate (3) connected to (2) is provided, and on both surfaces of the intermediate plate (3) where the intake hole (1) is located ,
Mixing reinforcing fiber with synthetic rubber or synthetic resin
Elastic layer coated with a thickness of 50μ to 300μ
It disposed a metal sheet (4) having a (6), on both sides of the position of the exhaust hole (2) is arranged at least one or more thin steel plate (5), the thin (4 ) And thin steel plate (5) with air intake (1) and exhaust
(2) is continuously milled, and these thin plates (4) and thin
An intake / exhaust gasket, wherein a steel plate (5) is integrally attached to an intermediate plate (3) . Wherein the respective openings of the air inlet (1) and an exhaust hole (2), insulation gasket according to claim 1, characterized in that a bead (7) which surrounds the opening. 3. An opening of the thin steel plate (5) formed in the exhaust hole (3) is folded back to a size substantially equal to or slightly larger than the opening of the intermediate plate (3). 7)
3. The intake and exhaust gasket according to claim 1, wherein the gasket is formed.