JPH0714695Y2 - Metallic laminated gasket for internal combustion engine with auxiliary combustion chamber - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal laminated gasket for an internal combustion engine with a secondary combustion chamber.

[0002]

2. Description of the Related Art An upper plate or a lower plate is folded back to provide a folded portion which constitutes a cylinder hole, a wire ring which surrounds the cylinder hole is provided inside the folded portion, and a mouthpiece which constitutes a sub combustion chamber of an internal combustion engine. An intermediate plate interposed between the upper plate and the lower plate is partially cut out to provide a void portion beyond the outer peripheral edge of the hitting portion, and the void portion is filled with a heat-resistant compression material such as graphite. There is a metal laminated gasket for an internal combustion engine with a sub-combustion chamber having a structure interposed between the upper and lower plates (for example, Japanese Utility Model Laid-Open No. 59-11140).

[0003]

The gasket having the above-mentioned conventional structure is provided with a compression material so as to absorb the step generated between the mouthpiece and the cylinder head to prevent gas leakage. Since the mouthpiece forming the auxiliary combustion chamber is supported by the wiring arranged in the folded portion, stress fluctuations of the mouthpiece during engine operation are concentrated on the wiring and are present between the wiring and the mouthpiece. It was found that cracks may occur starting from the folded-back portion and gas leakage may occur.

The present invention has been devised for the purpose of eliminating such drawbacks of the conventional example and providing a metal laminated gasket for an internal combustion engine with a sub-combustion chamber, which has a much better sealing property than the conventional example. Is.

[0005]

A folding portion for forming a cylinder hole by folding an upper plate or a lower plate is provided, a wire ring surrounding the cylinder hole is provided inside the folding portion, and a sub combustion chamber of an internal combustion engine is provided. A void portion in a range beyond the outer peripheral edge of the portion of the die to be constituted constitutes a middle plate interposed between the upper plate and the lower plate and is partially cut out, and a heat-resistant compression material such as graphite is provided in the void portion. In the metal laminated gasket in which the upper plate, the lower plate and the intermediate plate constituting the gasket base material are disposed between the void and the wiring, the thin auxiliary pieces are arranged between the upper and lower plates. The auxiliary piece is arranged between the upper and lower plates.

[0006]

FIG. 1 shows an embodiment of a metal laminated gasket for an internal combustion engine with an auxiliary combustion chamber according to the present invention. FIGS. 1 and 2 show a first embodiment, FIG. 3 shows a second embodiment, and FIG. Shows a third embodiment, and FIG. 5 shows a fourth embodiment.

First Embodiment A gasket A of the first embodiment has a first intermediate plate 3, a second intermediate plate 4 and a third intermediate plate 5 interposed between an upper plate 1 and a lower plate 2. A folded portion 7 which constitutes a gasket base material, and which folds the upper plate 1 in the direction of the lower plate 2 to form a cylinder hole 6, is provided, and a wire ring for generating a sealing surface pressure surrounding the cylinder hole 6 inside the folded part 7. 8 is provided, and a void portion 9 is partially punched and cut out in a portion beyond the outer peripheral edge 80 ′ of the die 80 at a portion of the first intermediate plate 3 where the die 80 abuts, and the void portion 9 is provided in the void portion 9. A piece of the first intermediate plate 3 which is filled with a heat-resistant compression material 10 such as graphite, is interposed between the upper plate 1 and the second intermediate plate 4, and is interposed between the void 9 and the wire ring 8. An auxiliary piece 11 fixed to the piece 3'is arranged on the 3 ', and the auxiliary piece 11 is attached to the first intermediate portion. A bead 12 disposed between the plate 3 and the upper plate 1 so as to surround the void 9 is provided on the second intermediate plate 4.

The auxiliary piece 11 is made of a metal plate thinner than each of the plates 1, 2, 3, 4, and 5 forming the gasket base material.

Second Embodiment In the second embodiment shown in FIG. 3, the auxiliary piece 11 is fixedly arranged on the lower surface of the second intermediate plate, and the bead 12 is provided on the first intermediate plate 3. The remaining structure has almost the same structure as that of the first embodiment.

Third Embodiment In the third embodiment shown in FIG. 4, the bead 12 is omitted, and by omitting the bead 12, the unnecessary third intermediate plate 5 is omitted, and the portion of the first intermediate plate 3 is omitted. The auxiliary piece 11 is arranged on the lower surface side of the piece 3 ', and the rest is the same as in the first embodiment.

(Fourth Embodiment) In the fourth embodiment of FIG. 5, instead of the first embodiment in which the auxiliary piece 11 is partially provided in the vicinity of the void portion 9, the auxiliary piece 11 surrounds the wiring 8. The auxiliary pieces 11 are arranged so as to facilitate the work of assembling the auxiliary piece 11 and prevent the deformation of the cylinder liner as much as possible. The remaining points are the same as in the first embodiment.

The arrangement contents of the auxiliary piece 11 of this embodiment can be applied to the second and third embodiments.

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the surface pressure of the gasket portion on which the auxiliary piece is arranged is higher than that of the other portions except the wiring portion, and the mouthpiece and the auxiliary portion are provided. Since it is supported at two places on one side, the stress fluctuation of the die during engine operation does not concentrate on the wiring like the conventional example
It is possible to disperse the concentrated stress on the wiring,
It is possible to provide a metal laminated gasket for a secondary combustion chamber internal combustion engine, which is provided with a compressive material having a sealing property that is further excellent as compared with the conventional example, by removing as much as possible the cause of cracks generated in the folded-back portion.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a first embodiment.

FIG. 2 is a sectional view of the first embodiment.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a sectional view of a third embodiment.

FIG. 5 is a partially cutaway plan view of the fourth embodiment.

[Explanation of symbols]

 1 Upper plate 2 Lower plate 3 First intermediate plate 6 Cylinder hole 7 Folding part 8 Wiring 9 Gap 10 Compressive material 11 Auxiliary piece

Claims (1)

[Scope of utility model registration request] 1. A folded-back portion that is formed by folding back an upper plate or a lower plate to form a cylinder hole, a wire ring that surrounds the cylinder hole is provided inside the folded-back portion, and a cap that constitutes a sub-combustion chamber of an internal combustion engine is provided. A void portion in a range beyond the outer peripheral edge of the hitting portion is partially cut out in the intermediate plate interposed between the upper plate and the lower plate, and the void portion is filled with a heat-resistant compression material such as graphite. In the metal laminated cylinder head gasket interposed between the upper and lower plates, a thin auxiliary piece other than the upper plate, the lower plate and the intermediate plate forming the gasket base material is arranged between the void and the wiring, and the auxiliary piece A metal laminated gasket for an internal combustion engine with a sub-combustion chamber in which the above and below plates are interposed.