JPH0714696Y2 - 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, which is interposed between the upper plate and the lower plate, is partially cut out to form a void portion beyond the outer peripheral edge of the hitting portion, and a heat-resistant compression material such as graphite is engaged in the void portion. Then, there is a metal laminated type cylinder head 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. 59-111).
No. 40).

[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 cavity is formed in the intermediate plate interposed between the upper plate and the lower plate in a range exceeding the outer peripheral edge of the portion of the die to be contacted, and a heat-resistant compression material such as graphite is engaged in the cavity. In the metal laminated cylinder head gasket interposed between the upper and lower plates, a die support piece having a wall thickness larger than that of the intermediate plate provided with the cavity is arranged on the wiring side of the cavity, and the die support piece is compressed. And a structure in which the space is engaged with the space.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a metal laminated cylinder head gasket for an internal combustion engine with a secondary combustion chamber according to the present invention.
The cylinder head gasket A of the embodiment has an upper plate 1 and a lower plate 2.
And a first intermediate plate 3, a second intermediate plate 4 and a third intermediate plate 5 are interposed between the first intermediate plate 3, the second intermediate plate 4 and the third intermediate plate 5. A wire ring 8 for generating a sealing surface pressure surrounding the cylinder hole 6 is provided inside the folded-back portion 7, and a portion of the first intermediate plate 3 which is in contact with the mouthpiece 80 extends beyond the outer peripheral edge 80 ′ of the mouthpiece 80. A cavity 9 is formed by cutting it out, and a heat-resistant compression material 10 such as graphite and a die support piece 11 are aligned and engaged in the cavity 9, and the die support piece 11 is arranged on the wiring 8 side. The mouthpiece support piece 11 is thicker than the first intermediate plate 3.

It is convenient for assembling the gasket if the both ends of the mouthpiece support piece 11 are fixed to the first intermediate plate 3, that is, the edges of the gap 9.

[0008]

[Effect of the Invention] Since the present invention is configured as described above,
The mouthpiece is supported at two places, the wiring section and the mouthpiece support piece. Therefore, the stress variation of the mouthpiece during engine operation does not concentrate only on the wiring as in the conventional example, and the concentrated stress on the wiring can be dispersed. 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.

Since the mouthpiece support piece is formed separately from the main body member such as the upper plate, when the present invention is applied to an engine having a plurality of cylinder holes, the cylinder holes of the cylinder holes are It is possible to select the plate thickness of the mouthpiece support piece according to the environment and optimize the support state of each part.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view.

FIG. 2 is a sectional view.

[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 Mouthpiece Support 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 cut out in the intermediate plate interposed between the upper plate and the lower plate, and a heat-resistant compression material such as graphite is engaged in the void portion to form the upper and lower portions. In the metal laminated type cylinder head gasket interposed between the plates, a die support piece having a wall thickness larger than that of the intermediate plate provided with the cavity portion is arranged on the wiring side of the cavity portion, and the die support piece is aligned with the compression material to form the gap. Laminated gasket for internal combustion engine with sub-combustion chamber that is engaged with the part.