JPS5990745A - Laminated metal type cylinder head gasket - Google Patents

Abstract

PURPOSE:To improve the sealing properties and durability by a structure wherein an elastic member is formed at a portion corresponding to the underside of a hot plug being installed when a gasket is assembled in an combustion sub- chamber type internal combustion engine with the hot plug inserted in the lower part of a cylinder head. CONSTITUTION:A combustion sub-chamber type internal combustion engine has a cylinder head 1, into a combustion chamber hole open on the underside of which a hot plug 2 is fitted in order to form an air passage hole 3 and combustion sub-chamber 4, while a cylinder head gasket 10 is arranged between the cylinder head 1 and a cylinder body 25. In this case, an elastic part 18 is formed on the intermediate plate C of the cylinder head gasket 10 at a portion corresponding to the installation position of a hot plug 2 to form the combustion sub-chamber 4. The elastic part 18 is formed by providing, for example, bead- like irredgularities 19. Due to the structure as mentioned above, even when the protrusions and recesses of the underside of the hot plug 2 from that of the cylinder head 1 exist, the protruded and recessed states can be respectively absorbed by the deformation of the elastic part 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a metal laminated gasket for an internal combustion engine with a sub-combustion chamber, and more specifically, to improvements in the sealing performance and durability of the gasket portion placed on the sub-tube combustion part. This product provides a metal laminated type head gasket knit with improved wearability.

1. As shown in FIG. 1, a pot plug 2 is provided in the combustion chamber hole opened on the lower surface of the shilling head 1, and the combustion chamber hole is closed except for the ventilation hole 3 provided in the hot plug to form an auxiliary combustion chamber 4. It consists of

Since the Futayoshi station shilling head 1 and the hot plug 2 are constructed and assembled separately, the lower surface 2a of the hot plug 2 is located at the T surface 1 of the shilling head 1 as shown in FIG.
In many cases, it protrudes by a little more than a (+t) or is press-fitted by (-t) as shown in FIG.

In addition, when the sub-1 internal combustion engine is started in the morning, the lower surface 2a of the hollow l plug 2 and the T surface 1a of the sill head 1 are
Even if they match, the hot plug 2 may become dented during operation of the internal combustion engine, resulting in a step (1) at the installation location. In any case, it is often difficult to avoid the formation of a step (1) between the lower surface 2a of the true plug 2 and the lower surface 1a of the shilling head 1.

When using an asbestos gasket or a graphite gasket l for the Schilling Rad gasket, its compressibility absorbs the step (1) and makes the seal intact. It's easy.

However, in the case of a metal laminated M-shaped delta gasket (steel laminate gasket), which is constructed by laminating thin metal plates, it has sufficient compressibility to span the above-mentioned level difference. Since there is no contact pressure, the surface pressure becomes uneven on the holding end, causing trouble in sealing.

To further explain this phenomenon with reference to the drawings, FIG. 3 is a plan view showing a part of a conventional Kon-ku laminated type Herad gasket, in which a head gasket 110 has a combustion chamber hole 11 and a bolt hole 12. A water hole 13, an oil hole 14, and a bushing rod hole 15 are provided. And the partial combustion chamber 4 is
This is the part that is compressed by contact with the lower surface 2a of the hole plug 2 provided at the lower part of the hole.

Fig. 4 is a sectional view taken along line XX in Fig. 3, and the head gasket 10 is inserted between the upper plate A, the lower tffiB, the middle 4fiC, D, and E, which are inserted into these openings, and the wiring F.
It is composed of As shown in Fig. 4, a reinforcing plate G is laminated on the part M where the lower surface 2a of the hollow plug 2 forming the auxiliary combustion chamber 4 is located to improve gas sealing performance. Currently (large)

As shown in FIG. 1, if the hot plug 2 protrudes from the lower surface 2a or the lower surface 1a of the shilling head 1, the protruding portion will be subjected to extreme compressive force when the gasket 10 is installed, and as a general rule, the surface pressure will increase. This often results in the destruction of the gasket part M, or in the case where the hot plug 2 is made of a brittle material such as ceramic, the hot plug itself is damaged.

On the other hand, when the lower surface 2a of the hot plug 2 is provided at a distance from the lower surface 1a of the shilling head 1 as shown in FIG. 2, the surface pressure generated by the lower surface 2a of the hot plug 2 is insufficient. Therefore, there were problems with the gold [111i type] gasket F, which were related to the state of insertion of the hot plug 2 into the combustion chamber hole, such as causing local gas leakage.

The present invention has been devised in order to eliminate the drawbacks of the metal flexure layer gasket of the auxiliary combustion chamber type internal combustion engine since tM, and is suitable even if unevenness occurs due to the insertion state of the hot plug. The object of the present invention is to provide a head gasket that can provide a good seal.

In order to accomplish the above-mentioned purpose, the present invention is to insert a hot plug into the lower part of the shilling head to form a head gasket in a sub-combustion chamber type internal combustion engine. This is a gold 5ffliJ-shaped gasket made of gold with an elastic part consisting of a concave and convex part formed in a portion corresponding to the lower surface of the plug so as to be deformable in the thickness direction.

The invention will now be described in detail with reference to concave surfaces.

Silk 50 is a cross-sectional view showing the main part of the head gasket according to the present invention, and the essential structure is the same as that of the conventional gasket, but the middle plate C has the secondary combustion chamber 4 shown in FIG. ! To install the pot plug, place the elastic part 1 at the target part M.
8 is formed.

The elastic portion 1B may be formed with bead-like unevenness 19 as shown in FIG. 6, or with lattice-like unevenness 2 as shown in FIG.
form 0. Incidentally, the number of concavities and convexities of the bead cane shown in FIG. 6 is usually about 3 to 6.

FIG. 12 shows an example of optimal unevenness, in which a flat portion 1'la is provided between bead-like unevenness 19.

The unevenness is a type of fold formed by flattening a thin metal plate, so if the height of the unevenness and the ItJ1 interval are larger than necessary, the unevenness will occur when the bed gasket is installed in an internal combustion engine. Since the hot plug may not be held securely and the sealing performance may be deteriorated, it is effective to provide a flat portion between the irregularities as described above in order to prevent this.

However, as the area of the flat part 19a increases, its function as an elastic part deteriorates, so the thickness and strength of the metal plate forming the head gasket, the shape of the unevenness, the size of the unevenness, etc. should be taken into consideration. It is better to design the area of the flat portion 1'9a.

As described above, by forming the unevenness 19 and 20 on the intermediate plate C, the elastic portion 1B having compressibility is laterally squeezed to correspond to the glI.

Fig. 8 shows the bed gasket 10 shown in Fig. 6 by internal combustion (
If H'FJ-, which is provided at the opening of the sill head 1 and the shilling body 25, is shown.

As mentioned above, by processing the part M of the head gasket corresponding to the lower surface of the auxiliary combustion chamber 4 as shown in Fig. 6.7, the elastic part 1B is formed and compressibility is imparted. Therefore, as shown in Figure 8, connect the bottom of hot plug 2.
Even if i2a protrudes a little and the 3g is over, or even if the bottom surface 2a of the plug 2 is slightly bent as shown in Fig. 9, the amount of deformation of the elastic part 1B will change according to the 1χ trace. It is absorbed and a good seal can be obtained as well as moderate blood pressure.

10 is a cross-sectional view of the head gasket νF according to the embodiment of Soba 2. In this embodiment, the upper part A is formed with unevenness 22 to form an elastic part 1. There is.

FIG. 11 shows a cross section of a main part of a head gasket according to a third embodiment.

In this embodiment, the lower plate B is provided with unevenness 23 to form the elastic portion 1B. Its effects are 1,
The second and third embodiments are the same.

The elastic part 1B needs to have the function of changing according to the level difference between the hot plug lower surface 2a and the head lower surface 1a that constitute the auxiliary combustion chamber 4, and also to ensure the sealing of combustion gas in that part. It must also have the functionality to do so.

The unevenness constituting the elastic part 1B is determined by the thickness of the metal plate used for elastic processing, the shape of the unevenness, the height of the unevenness, the tightening load of the helad gasket of the internal regulation engine, and the [Ω difference] of the hot plug. It is necessary to determine the optimal one based on the degree of

Further, the plate on which the unevenness process for laterally drawing the elastic portion 18 is applied may be any of the plate materials constituting the head gasket 10, and in some cases, the unevenness process may be applied to the root of the number of pairs. Good too.

As described in detail above, in the gold λ stack type head gas quench Y according to the present invention, the metal plate located on the lower surface of the auxiliary combustion chamber is processed to form an elastic portion 10, and the elastic portion 10 is When the difference in level between the bolt plug and the 7-ring head is corrected on the first day, the surface pressure vortex 11 generated due to the insertion state of the hot plug in the rod and the irregularity 11 on the seal due to excess or deficiency are caused by I71. ￥i Portrait is something you can do.

[Brief explanation of the drawing]

Ei 1 [21 and Figure 2 are sub 1 installed on the shilling head]
A part of the blade firing chamber is equipped with a hot plug that weighs 414g. FIG. FIG. 5 is a cross-sectional view showing 5 parts of the head gasket according to the example of unexploded 4 sets 1, FIGS. FIG. 9 shows an internal regulation 4 equipped with head gases 17 and 11 according to the present invention.
It is a sectional view showing the main part of the office opening. +111'l and) Fig. 11 is a sectional view showing the main parts of the head gasket according to the second embodiment and the third embodiment. FIG. 12 is a cross-sectional perspective view showing another shape of the unevenness that laterally restricts the elastic portion. 1. Shilling head, 2. Pot plug. 4. Secondary combustion chamber, 1o. Head gasket, 11.
Combustion chamber hole, 1st... bullet (Ikube, 19.20.22.23)
...Irregularities, M...The part that is pressed by the hot plug. Acting Patent Attorney Makoto Ogawa - Patent Attorney Kiyoshi Noguchi Patent Attorney Kazuhiko Saishita Figure 1 Figure 2 Figure 3 Figure 4 Figure 1 Figure 5 IF IIJ Figure 10] 8

Claims (1)

[Claims] Gasket ↑I4r & metal plate on the part corresponding to the bottom surface of the Hola 1 plug when the head gaff, keratome, and gasket are installed in a sub-combustion chamber type internal combustion engine configured by inserting a hot plug into the lower part of the shilling head. A metal box-shaped helical gasket formed by forming an elastic part into an uneven shape so that it can be deformed in the V-direction.