JPH0417881Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention is a metal gasket, particularly for use in the joint surface between a cylinder head and a cylinder block constituting an internal combustion engine. This invention relates to a metal gasket for preventing lubricating oil leakage.

(Prior Art) A metal gasket is attached to a joint surface between a cylinder head and a cylinder block that constitute an internal combustion engine. In this case, beads are provided on the substrate of the metal gasket as necessary, so when the members to be joined are crimped together with the fastening force of a fastening means such as a bolt, an elastic seal line is formed on the joint surface. formation, achieving even better sealing effects.

FIG. 4 is a partially cutaway plan view showing a conventional metal gasket, which will be explained below.

In the figure, 1 is the metal gasket body;
This metal gasket consists of at least one elastic metal plate 2, which are used in a stacked manner.

Further, a plurality of combustion chamber holes 3 are bored in the surface of the elastic metal plate 2, corresponding to the combustion chambers on the cylinder block side (not shown). Reference numeral 4 denotes a bolt hole through which a bolt or the like is inserted when the metal gasket main body 1 is interposed between the cylinder block and the cylinder head and they are fastened together.

Even if they are fastened together with bolts, etc., there will be gaps in the joint surfaces due to engine explosion vibrations, and in order to prevent combustion gas from leaking from this part, the periphery of the combustion chamber hole 3 should be A bead 5 (the dashed line in the figure is shown as the locus of the top of the bead) is provided.

In addition, since the explosion vibration of the engine is applied as a repeated load to the bead 5, and there is a risk that the bead 5 will undergo fatigue failure over a long period of time, a stopper (stainless finish) is installed at the immediate periphery of the combustion chamber hole 3. Part) 6
is provided to suppress the vibration amplitude to a low level.

There are various types of stoppers, such as those using grommets, those using thermoplastic materials, and those of the above-mentioned composite type, which have already been proposed.

(Problems to be Solved by the Invention) However, in recent years, engines have rapidly become smaller, have more valves, are lighter, and have higher performance, and the distance between the cylinders of a multi-cylinder engine is becoming narrower. As a result, the circular locus of the bead, which was previously set for each cylinder, cannot be taken individually, and as a result, there is less room for providing a stopper.

In short, the area of adjacent parts of each cylinder decreases and the load per area increases, resulting in dents in the engine, or if a grommet system is used, due to the narrow space between them. It is also conceivable that a situation may occur in which the position is deviated.

The present invention was made in view of the above circumstances, and it is a metal gasket that can secure a position for the stopper even when the cylinders are brought close enough to each other, making it possible to reduce the size and weight of the engine. is intended to provide.

[Structure of the invention] (Means for solving the problems) The present invention will be explained using FIG. 1 corresponding to an embodiment. In the metal gasket body 1 , a bead 5 and a stopper 6 are provided on the periphery of each combustion chamber hole.A common bead 5-1 is provided between the adjacent combustion chambers, and a common bead 5-1 is provided between the adjacent combustion chambers. A minimum stopper 6-1 is installed along the combustion chamber hole 3 at the intermediate position (X-X' cross-sectional position).
is provided, and an increase stopper 6-2 is provided at the adjacent end position (Y-Y' cross-sectional position) to connect these,
Moreover, the beads 5 provided at the periphery of each combustion chamber hole are interconnected to form an integral structure.

(Function) When the metal gasket body 1 is installed, combustion chamber holes are formed corresponding to the positions of each cylinder in the cylinder block. In this case, there is a common bead 5-1 between adjacent combustion chamber holes, and a minimum increase stopper 6-1 corresponds to the bead 5-1 that occurs between the holes.
However, the increase stopper 6-2 provided at the adjacent end compensates for this.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of a metal gasket according to the present invention, shown as a plan view.

In FIG. 1, the same corresponding parts as in FIG. 4 are designated by the same reference numerals.

In the figure, reference numeral 5-1 indicates a bead commonly provided between the cylinders, and in this case, it is provided in a straight line at an intermediate position between each cylinder. The reason for this is that a straight line is most efficient in distributing a limited area to each cylinder most effectively.

As a result of the cylinders being brought closer to each other, the installation width of the stopper 6 becomes extremely small at the intermediate position between adjacent cylinders, that is, at the cross section taken along the line X-X', as shown in FIG. 2b. However, at the adjacent end positions of each cylinder, that is, at the Y-Y' cross section, as shown in FIG. 2a, the mounting width of the stopper is increased to compensate for the intermediate portion.

Therefore, when the locus of the bead is viewed as an overall outline, the outer edge is connected between all the cylinders and has a so-called chain shape. Of course, the partial height of the stopper is set to match the distortion of the engine.

Next, to explain the operation, when the metal gasket main body 1 is inserted between the cylinder block and the cylinder head and tightened, each combustion chamber hole 3 is arranged corresponding to each cylinder, and as a result, the combustion chamber becomes independent. Considering this, the occurrence of the gap can be suppressed by the cooperation between the bead 5 and the stopper 6.

Also, considering the distance between the combustion chambers, the occurrence of gaps between adjacent cylinders can be suppressed by the cooperation of the bead 5-1 provided in common between the cylinders and the stoppers 6, 6 provided on both sides of the bead, as described above. A small stopper at the intermediate position (X-X' cross-sectional position) is compensated for by a large stopper (this is called an increase stopper) at the adjacent end position (Y-Y' cross-sectional position).

FIG. 3 shows another embodiment of the increasing configuration, and FIGS. 3a to 3d are all known as general bead configurations.

However, the reasons given here indicate that these materials can also be used as a weight increase stopper according to this embodiment.

According to the above embodiment, an increase stopper is provided at the adjacent end of each cylinder, and an appropriate increase in thickness is performed based on a predetermined value measured when the gasket device is tightened, and this increase stopper portion can be compensated for at the weakest point between adjacent intermediate positions.

[Effects of the invention] As explained above, according to the invention, when the cylinders are provided close to each other, a bead common to both cylinders is provided at the center of the adjacent portion of each cylinder,
A minimum amount of stoppers are provided on both sides, and increasing stoppers are provided at the adjacent ends of each cylinder to compensate for the small portion, and the contours of the beads are connected to form an integrated structure, so that the engine It is possible to provide a metal gasket that can be made smaller, lighter, and higher in performance.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the metal gasket according to the present invention, Fig. 2 is a cross-sectional view of each of the parts shown in Fig. 1, Fig. 3 is a block diagram of an example of the structure of the increase stopper, and Fig. 4 is a block diagram of a conventional metal gasket. FIG. 1 ... Metal gasket body, 2... Elastic metal plate, 3... Combustion chamber hole, 4... Bolt hole, 5, 5-
1... Outline of the bead, 6... Stopper.

Claims (1)

[Scope of utility model registration request] In a metal gasket in which a plurality of combustion chamber holes are bored adjacent to each other in a substrate made of an elastic metal plate, and a bead and a stopper are provided at the periphery of each combustion chamber hole, a common bead is provided between the adjacent combustion chambers. At the same time, a stopper with the minimum width is provided on the flat part of the common bead near each combustion chamber, and these are connected in a shape in which the width of the stopper increases sequentially toward the increasing stopper provided at the adjacent end position. A metal gasket characterized by: