JPH075321Y2 - Cylinder head gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cylinder head gasket.

[Prior Art] A structure in which a reinforcing ring is provided in a cylinder hole and the sealing surface pressure is held by the reinforcing ring is known as disclosed in, for example, Japanese Utility Model Laid-Open No. 56-30657. .

[Problems to be Solved by the Invention] In general, the cylinder head gasket secures the sealing surface pressure by the tightening load of the tightening bolts, while coping with the increase of the heat load with the recent increase in the output of the internal combustion engine. It has to be, and the increased heat load appears in the narrow space between the cylinder bores.

In order to prevent the fatigue and fatigue of the gasket due to heat load, it is conceivable to arrange a double reinforcing ring as described in the above publication, but on the other hand, it is necessary for each part due to the double reinforcing ring. In order to secure a sufficient sealing surface pressure, a corresponding tightening load is required.

That is, if the tightening load is partially concentrated on a portion having a large heat load, the tightening load does not need to be increased (the tightening bolt should be increased). Since the tightening load must be applied to unnecessary portions for securing, the bolts must be correspondingly large, which is unsuitable for the recent downsizing of internal combustion engines.

[Means for Solving Problems] The present invention has been devised in order to deal with the contradictory problems of increasing the output and downsizing of an internal combustion engine. The cylinder hole is formed by a folded portion made of a grommet or the like. A structure in which a reinforcing ring surrounding the cylinder hole and a reinforcing rod interposed between the reinforcing rings are housed in the folded portion, and the reinforcing rod is arranged only in a narrow portion between adjacent cylinder holes. Is.

[Embodiment] The drawings show an embodiment of a cylinder head gasket according to the present invention, in which A is a cylinder head gasket, 1 is a cylinder hole, 2 is a folded portion that constitutes the cylinder hole 1,
Reinforcement rings 4 housed in the folded-back portion 2 and surrounding the cylinder hole 1 are reinforcement rods, respectively.

[First embodiment]

The gasket A of the first embodiment shown in FIGS. 1 to 3.
The intermediate plate 7 is interposed between the upper plate 5 and the lower plate 6, and the lower plate 6 is folded back to the upper plate 5 side in the cylinder hole 1 portion to form the folded portion 2, and the reinforcing portion 2 is reinforced. 1 shows a metal laminated gasket in which a ring 3 is housed, and a straight reinforcing rod 4 interposed between the reinforcing rings 3 and 3 is arranged in a narrow portion 10 between the cylinder holes 1 and 1 adjacent to each other. The reinforcing rod 4 is sandwiched between the folded portions 2.

The reinforcing rod 4 is welded to at least one of the reinforcing rings 3.

[Second embodiment]

The second embodiment is shown in FIGS. 4 to 6. In the second embodiment, a metal graphite sheet 9 in which a non-metal material is laminated on a metal core material 8 is assembled with a grommet forming the cylinder hole 1. The folded portion 2 is attached to form the folded portion 2.
The reinforcing ring 3 is housed in the gasket A,
A pair of reinforcing rods 4, 4 along the respective reinforcing rings 3, 3 are interposed in a narrow portion 10 between the cylinder holes 1, 1 and the reinforcing rod 4 is sandwiched by the folded portions 2. The reinforcing ring 3 and the reinforcing rod 4 are welded to each other. The reinforcing rod 4 may be made of the same material as the reinforcing ring 3, but may be formed by changing the hardness or the material.

[Third embodiment]

FIG. 7 shows a structure in which the reinforcing rod 4 has a large diameter by the reinforcing ring 3, and the reinforcing rod 4 is used for the gasket A of the first or second embodiment.

[Other Examples]

The reinforcing rod of the first embodiment may be replaced with the reinforcing rod of the second embodiment, or the reinforcing rod of the second embodiment may be replaced with the reinforcing rod of the first embodiment. Further, it is more effective to use a heat resistant steel such as stainless steel, which has excellent heat resistance, for the reinforcing rod.

[Advantage of the Invention] The present invention has a cylinder hole formed by a folded portion such as a grommet, and a reinforcing ring accommodated in the folded portion can secure a sealing surface pressure around the cylinder hole. Since the reinforcing rod is arranged only in the narrow portion, the presence of this reinforcing rod can increase the sealing surface pressure of the narrow portion and reinforce fatigue and fatigue to prevent gas leakage. Moreover, since the reinforcing ring is housed in the folded portion and the reinforcing rod is arranged between the reinforcing rings, the folded portion can protect the reinforcing ring and the like from high heat, and even when the reinforcing ring is made of a hard material, the folded ring is folded. The part serves as an interference material to prevent indentation on the cylinder head, etc., and it is possible to absorb the difference in compression amount between the reinforcing ring and the reinforcing rod (hard to be compressed if it is hard), which is against the miniaturization of the internal combustion engine. No gasket can be provided.

[Brief description of drawings]

The drawings show an embodiment of a cylinder head gasket according to the present invention. Fig. 1 is a plan view, Fig. 2 is a sectional view taken along the line II 'of Fig. 1, and Fig. 3 shows the relationship between a reinforcing ring and a reinforcing rod. FIG. 4 is a plan view showing a second embodiment of FIGS. 4 to 6, FIG. 4 is a sectional view, FIG. 5 is a plan view showing the relationship between a reinforcing ring and a reinforcing rod, and FIG. 7 and 8 are sectional views showing the relationship between the reinforcing ring and the reinforcing rod in the third embodiment. 1 ... Cylinder hole, 3 ... Reinforcing ring, 4 ... Reinforcing rod, 10 ... Narrow portion

Claims (1)

[Scope of utility model registration request] 1. A cylinder hole is formed by a folded portion made of a grommet, and a reinforcing ring surrounding the cylinder hole and a reinforcing rod interposed between the reinforcing rings are housed in the folded portion, and the reinforcing rods are mutually arranged. A cylinder head gasket, which is arranged only in a narrow space between adjacent cylinder holes.