JPH0511333Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field In internal combustion engines with a secondary combustion chamber, the mouthpiece of the secondary combustion chamber deforms due to heat changes and stress changes due to severe engine operating conditions, resulting in poor sealing performance. This causes a decrease in

The present invention relates to a metal laminated gasket in which beads are arranged in parallel at the portion corresponding to the mouthpiece of the sub-combustion chamber in order to prevent gas leakage due to deformation of the mouthpiece of the sub-combustion chamber.

Conventional technology As a measure to accommodate the auxiliary combustion chamber mouth part in the structure of the cylinder head gasket, Japanese Patent Laid-Open No. 59-90745
As described in the above publication, there is one in which a bead is provided in a ripple shape in the direction toward the outside of the cap in the cap portion.

Problems that the invention aims to solve As mentioned above, the bottom surface of the mouthpiece tends to dent as the engine operating conditions and operating time elapses, creating a step in relation to the bottom surface of the cylinder head. It depends, but in general, the center of the round bottom of the mouthpiece is deeply recessed, and it tends to gradually become shallower toward the outside. due to fluctuations).

Therefore, the above-mentioned conventional type has a certain function when compared to a type without beads, but compared to the level difference absorption in a shallow depression, it lacks in absorbing the level difference in a deep depression, so it prevents gas leakage. is not necessarily perfect.

Means for solving the problem Mutually independent beads are arranged in a direction away from the edge of the cylinder hole, and both ends of each bead are
It is located near the outer end of the cap and is connected to a circular bead provided along the outer end of the cap.

Embodiment The drawings show an embodiment of the metal laminated gasket according to the present invention. In FIG. 1, 11 is a cylinder block, 12 is a cylinder head, 13 is an auxiliary combustion chamber mouthpiece fitted to the cylinder head 12, and A is a cylinder. This is a gasket interposed between the block 11 and the cylinder head 12.

Gasket A is installed between the upper plate 1 and lower plate 2, and the middle plate 1
0, 10a, and 10b, the upper plate 1 is folded back toward the lower plate 2 around the cylinder hole 3 to form a border 4, and inside the border 4 are middle plates 10, 1.
A core metal (wiring) 5 is disposed on the cylinder hole 3 side from the end portion 10' of 0a, 10b.

Reference numeral 6 in FIGS. 1 and 2 is a cap receiving portion provided on the middle plate 10 on the upper side of the gasket A. The receiving portion 6 is provided on the middle plate portion corresponding to the cap 13. As shown, the edge 3' of the cylinder hole 3
Beads 7a, 7 independent from each other in the direction away from
b, 7c, 7d, 7e, and 7f are provided in parallel arc shapes, and both ends of each bead are located near the outer end of the cap 13, and are provided along the outer edge of the cap. 7 and configure it.

FIG. 3 shows a second embodiment, in which the number of beads arranged next to each other is different, and
Second and third circular bead 7', 7'' are provided on one side or both sides of the circular circular bead 7 of the first embodiment, and the second,
The third circular bead 7', 7'' is connected to the bead 7a closest to the cylinder hole 3.

FIG. 4 shows a third embodiment, in which each arc-shaped bead of the first embodiment is placed on the outside of the bead 7a located near the cylinder hole edge 3' of the first embodiment. Instead of 7b to 7e, straight beads 7b' to 7f' are provided in parallel to each other.

This embodiment has a greater sealing effect than the arc-shaped bead of the first embodiment. The reason for this is that in the above embodiment, if gas leakage cannot be prevented by the first bead, the gas leaks in an arc shape along the second bead, so that the gas leakage range is relatively large.

On the other hand, in the third embodiment, the structure is similar to constructing a dam, so that gas leakage can be linearly prevented.

FIG. 5 shows a fourth embodiment, in which a second notched bead 7' is provided on the outside of the notched bead 7 provided on both sides of the outer end of the cap, and the bead 7a is
One end of a short straight bead 8 is connected to the outside of the end side of the second notched circular bead 7', and the other end of the straight bead 8 is connected to the bead 7a.

The bead provided on the cap of the embodiment described above is configured such that the height of the bead is gradually lowered as the bead becomes farther away along the outer periphery of the cylinder hole.

This allows the difference in height of the cap bead to follow the deformation of the cap, thereby improving the sealing effect.

Effects of the Invention Since the present invention has the above-described configuration, it is possible to prevent deterioration in sealing performance due to deformation of the auxiliary combustion chamber mouthpiece caused by high-load operation of the internal combustion engine. In other words, in a gasket that does not have a bead on the mouthpiece, as the mouthpiece deforms, the sealing surface pressure between the mouthpiece fitted to the cylinder head and the gasket decreases, inducing the risk of gas leakage. According to the present invention, the structure of the beads inherent in the gasket is composed of independent beads running parallel to each other along the cap and connected to a circular bead provided along the outer edge of the cap. The restoring force of the bead is further strengthened, and a decrease in seal surface pressure can be prevented.

In addition, as mentioned above, the center part of the round bottom of the cap is deeply recessed, and gas leakage is induced from the center part, but according to the present invention, an independent chamber is formed between each bead, and the stage gas sealing can be performed.

[Brief explanation of the drawing]

The drawings show an embodiment of the metal laminated gasket according to the present invention, FIG. 1 is a sectional view showing the state of use, FIG. 2 is a schematic plan view, and FIG. 3 is a schematic plan view of the second embodiment. FIG. 4 is a schematic plan view of the third embodiment, and FIG. 5 is a schematic plan view of the fourth embodiment. 3...Cylinder hole, 7a to 7f...Bead, 7b' to 7f'...Bead, 7 to 7''...
Missing circular bead, 13...Sub-combustion chamber cap.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a metal laminated gasket in which beads are arranged side by side in a portion corresponding to the mouthpiece of the auxiliary combustion chamber of an internal combustion engine with an auxiliary combustion chamber, independent beads are arranged in a direction away from the edge of the cylinder hole. A laminated metal gasket having a structure in which the beads are arranged side by side, and both ends of each bead are located near the outer end of the cap and are connected to a circular bead provided along the outer edge of the cap. 2. A utility model registration claim described in paragraph 1 of the structure in which several broken circular beads are further arranged in parallel along the outer periphery of the broken circular bead, and both ends of the circular beads are connected to the bead located in the immediate vicinity of the cylinder hole. Metal laminated gasket. 3. The metal laminated gasket according to claim 1, which is a registered utility model and has a structure in which each bead has a gradual height difference in the direction away from the bead closest to the edge of the cylinder hole.