JPH11336902A - Metal cylinder head gasket - Google Patents

Abstract

(57) [Problem] To provide a three-face mating part without considering the dimensional accuracy at an end part corresponding to a three-face mating part where each joining surface of a cylinder head, a cylinder block, and a front cover is adjacent to each other. An object of the present invention is to provide a metal cylinder head gasket that can reliably perform sealing. SOLUTION: A soft sealing material which is constituted by at least one thin metal plate and which is attached to a receiving space provided at a portion adjacent to a three-plane matching portion of the thin metal plate has a compressive force when mounted on an engine. To fill the gaps in the three-surface mating part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine having an integral front cover, and more particularly to an engine having a joint surface between a cylinder head H and a cylinder block B of an engine, as shown in FIGS. The present invention relates to a metal cylinder head gasket for performing sealing at a portion A (hereinafter, referred to as a “three-plane mating portion”) in which a joining surface between a cylinder block B and a front cover C is adjacent to each other.

[0002]

2. Description of the Related Art As is well known, a space between a cylinder head H and a cylinder block B is sealed by a cylinder head gasket mounted between the cylinder head H and a cylinder block B, while a timing chain case T is provided between the cylinder head H and the cylinder block B. Is sealed by a liquid gasket L applied between the front cover C and the cylinder head H and the cylinder block B.

[0003] On the other hand, the seal at the three-surface mating portion A is
For example, as shown in FIG. 2, when the edge of the cylinder head gasket G facing the front cover C is located inward of the joint surface of the cylinder head H and / or the cylinder block B, A gap S1 is formed between the cover C and the cylinder head gasket G. On the other hand, for example, as shown in FIG. 3, the edge of the cylinder head gasket G facing the front cover C has the cylinder head H and / or When it is positioned so as to protrude outward with respect to the joint surface of the cylinder block B, a gap S2 is provided between the cylinder head H and / or the cylinder block B and the front cover C.
Can be done. If the size of such a gap exceeds the allowable gap that can be filled with the liquid gasket, the sealing function of the liquid gasket is not exhibited, and oil leakage occurs. Therefore, the seal at the three-face mating portion A is greatly affected by the processing accuracy of the joint surfaces of the front cover C, the cylinder head H and the cylinder block B, the processing accuracy at the end of the gasket on the side facing the front cover C, and the like. Was something.

Further, the liquid gasket L tends to lose its sealing function due to repetition of thermal expansion and thermal contraction of the front cover C, the cylinder head H and the cylinder block B during actual operation, and is liable to cause oil leakage. . In addition, the liquid gasket L takes a long time to dry and generate a sealing function, so that the working efficiency is poor. Also, since the liquid gasket takes time and effort to separate the engine during disassembly and assembly, the maintenance property is poor. For this reason, the production cost and the maintenance cost have risen.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a metal cylinder head capable of reliably performing sealing at a three-plane mating portion without considering dimensional accuracy at an end portion corresponding to the three-plane mating portion of a gasket. It is intended to provide a gasket.

[0006]

SUMMARY OF THE INVENTION A metal cylinder head gasket for use in an engine having an integrated front cover according to the present invention comprises at least one sheet metal. A receiving space for adhering a soft sealing material is provided in a portion adjacent to the three-faced portion of the metal sheet, and the sealing material is compressed by the compression force when the gasket is mounted on an engine. The above problem is solved by being pushed out, thereby filling a gap between the front cover, the cylinder head and the cylinder block.

[0007] Since the sealing material seals the three-plane mating portion which has been influenced by the dimensional accuracy at the end portion corresponding to the three-plane mating portion of the conventional gasket, it is possible to relax the requirement for the dimensional accuracy of the gasket. Become.

Further, the gasket of the present invention is characterized in that a portion defined between at least one pair of cuts extending inwardly and spaced apart from the edge adjacent to the three-faced portion of the sheet metal at an appropriate angle. By bending at or
The sealing material is held at a predetermined position by drawing from the edge adjacent to the three-surface matching portion of the metal sheet to the inner part so as to have an opening at the edge adjacent to the three-surface matching portion of the metal sheet. Can be formed.
Further, a half or full bead is formed on the metal thin plate in order to further increase the tightening surface pressure, and the space on the inner surface side of the half or full bead adjacent to the three-plane mating portion is used as a receiving space for the sealing material. You can also.

In the gasket of the present invention, the height of a portion adjacent to the three-faced portion of the half or full bead metal sheet is set to half or full bead so that the sealing material is pushed toward the three-faced portion when the gasket is mounted. It can also be formed higher than the overall height.

Further, in the gasket of the present invention, at least one sheet metal is laminated at least on the bottom side of the receiving space of the sheet metal in order to prevent the sealing material from being damaged or peeled off when the gasket is not mounted. You can also.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 A metal cylinder head gasket according to an embodiment of the present invention is a metal cylinder head gasket for use in an engine having an integrated front cover, as shown in FIG.
It consists of.

A three-plane matching portion A of the metal sheet 1 (see FIG. 6).
A pair of cuts 2 and 2 extending inward from the edge of the metal sheet 1 is provided at a portion adjacent to the metal sheet 1. The metal sheet 1 is bent so as to be separated from the entire surface of the sheet metal 1 at the edge on the side of the surface matching portion. The space defined between the bent portion 3 and the entire surface of the metal sheet 1 (more specifically, the lower surface of the metal sheet 1 or the extension surface S of the applied flange surface) is a soft sealing material. 4 is used as a receiving space for attaching.

In this case, the cuts 2 are provided in plural pairs on the edge of the thin plate 1 on the side of the three mating portions, and the portion between the cuts 2 in each pair is subjected to bending in the same manner as described above. The sealing material 4 can also be attached to the receiving space in the processing part 3, respectively, so that the sealing can be performed at a plurality of parts separated from each other.

The sealing material 4 can be attached to the metal sheet 1 directly or by using an appropriate attaching means.
The gap between the front cover C, the cylinder head H, and the flange surface of the cylinder block B can be filled and sealed by a compressive force when mounted on the engine, which will be described later with reference to FIGS. Any member can be applied, for example, soft rubber such as silicon rubber, NBR, and fluoro rubber can be applied. Also,
The formation of the sealing material 4 is usually carried out by applying or pouring a liquid sealing material into a receiving space by an appropriate means such as screen printing or a dispenser to solidify. However, it is also possible to form the sealing material 4 in advance in a size and shape corresponding to the receiving space, and to attach it to the receiving space using a chemical or physical attaching means.

The gasket of the present invention formed as described above is disposed between the cylinder head H and the cylinder block B as shown in FIG. 5, and is attached by tightening a tightening bolt (not shown). At this time, most of the sealing material 4 is extruded toward the three-face mating portion A by pressing the bent portion 3 against the flange surface of the cylinder head H or the cylinder block B (in the illustrated case, the cylinder block B). . In this state, attach the front cover C to the cylinder head H
And when mounted on the cylinder block B, as shown in FIG. 6, the sealing material 4 fills the gap between the front cover C, the cylinder head H and the cylinder block B,
The sealing at the three-surface matching portion A is performed. put it here,
Although not an essential requirement for the present invention, the three-plane mating portion A
In order to seal the gap between the front cover C, the cylinder head H, and the cylinder block B in a portion other than the front cover C, a conventional liquid gasket 5 is attached to the flange surface of the front cover C before the mounting.

[0016]

[Embodiment 2] FIG. 7 shows another embodiment of the present invention.
3 of the metal sheet 1 formed by partially drawing from the edge adjacent to the surface matching portion A to the inner portion.
The configuration is the same as that of the previous embodiment except that it is defined in the drawn portion 6 having an opening at an edge adjacent to the surface matching portion.

In the above-described embodiment, the sealing material 4 is pushed out from between the bent portion 3 and the metal sheet 1 by the compressive force when the sealing material 4 is attached to the engine. However, in the present embodiment, the light is directed only to the three-surface matching portion A, and the sealing at the three-surface matching portion A can be performed with a smaller amount of the sealing material 4. Having.

[0018]

Embodiment 3 FIG. 8 is a view showing another embodiment of the present invention, wherein an internal space defined between a front cover C, a cylinder head H and a cylinder block B (this space is generally a gear case). A half bead 7 is formed on the thin metal plate 1 along the inner surface of the thin bead 7, and the space on the inner surface side of the portion of the half bead 7 adjacent to the three-plane mating portion A is used as a receiving space for attaching the sealing material 4. Except for this point, the configuration is the same as that of the above embodiment.

Since the metal sheet 1 has the half bead 7, the tightening surface pressure is increased along the inner space, that is, along the edge on the gear case side, and the cylinder bore (not shown) is formed.
Gas can be more reliably prevented from flowing from the gear case to the gear case, and at the same time, it is possible to eliminate the need to separately form and form a receiving space used only for attaching the sealing material 4. Have. On the other hand, since the half bead 7 has a shape that is also opened to the gear case side, the sealing material 4 is compressed by the compression force when the half bead 7 is mounted on the engine.
Has the potential to be pushed out to the gear case side as well.
Therefore, it is desirable that the sealing material 4 be partially adhered to the bead rising side of the space on the inner surface side of the half bead 7.

Further, the sealing material 4 is
There is a possibility that the sheet is extruded toward the mating portion A and also in the opposite direction. However, since a portion of the half bead 7 without the seal material 4 is compressed relatively earlier between the cylinder head H and the cylinder block B than the portion having the seal material 4, a sufficient amount of It is possible to extrude the sealing material 4.

However, as shown in FIG. 9, by forming the height d of a portion of the half bead 7 adjacent to the three-plane mating portion A to be higher than the overall height D of the half bead 7, this sealing material is formed. 4 can be more reliably extruded toward the three-surface mating portion A side.

[0022]

Embodiment 4 FIG. 10 is a view showing still another embodiment of the present invention, in which a full bead 8 is used as a receiving space for attaching the sealing material 4 instead of the half bead 7 described in the embodiment of FIG. Except for this, the configuration is the same as that of the above embodiment.

In this embodiment, the direction in which the sealing material 4 is pushed out by the compressive force when mounted on the engine is limited only by the direction in which the beads are provided, and the sealing material 4 which may be generated in the embodiment of FIG. The possibility of pushing out to the gear case side is eliminated. At this time, as described in the embodiment of FIG. 8, the sealing material 4 may be pushed out in the direction opposite to the three-plane mating portion A side (the inner side of the full bead 8). Since the part without the material 4 is compressed relatively early between the cylinder head H and the cylinder block B, a sufficient amount of the sealing material 4
It is possible to extrude.

Also, as described in the embodiment of FIG. 8, the height of the full bead 8 is changed as described with reference to FIG.
By forming the portion adjacent to the three-surface mating portion to be higher than the overall height, it is possible to more reliably push the sealing material 4 toward the three-surface mating portion A.

[0025]

Embodiment 5 FIG. 11 is a view showing still another embodiment of the present invention. In this embodiment, a metal cylinder head gasket is composed of a plurality of thin metal sheets (two metal sheets in the illustrated case) stacked on each other. It is composed of thin plates 1, 1a). One of the metal sheets (metal sheet 1) is formed in the same manner as the metal cylinder head gasket described in each of the above embodiments (in the case of the drawing, the metal cylinder head gasket of the embodiment of FIG. 4). Sheet metal 1a
Is disposed in a positional relationship such that the sealing material 4 attached to the receiving space of the metal sheet 1 is sandwiched between the metal sheet 1 and the sealing material 4, that is, disposed on the bottom side of the receiving space. Although not shown, 3
When two or more metal sheets are used, the remaining metal sheets are disposed in a positional relationship of being stacked on the metal sheet 1 side and / or the metal sheet 1a side.

As a result, the gasket of this embodiment can reliably seal the three-faced portion even when the single-plate gasket cannot meet the demand for the cylinder head gasket. By enclosing the attached sealing material 4 with the metal sheet 1 and the metal sheet 1a, external conditions can be prevented during transport, storage, handling for installation, and the like. This prevents the sealing material from being damaged or peeled off due to factors.

[0027]

According to the present invention, since the soft sealing member 4 is attached to the receiving space provided at the portion adjacent to the three-faced portion A of the thin metal plate, the compression when mounted on the engine is achieved. The gap between the front cover C, the cylinder head H, and the cylinder block B can be filled and securely sealed by the sealing material 4 being pushed to the three-face mating portion A side by force. The required sealing performance can be achieved irrespective of the dimensional accuracy of the gasket, while the sealing performance, which has been dependent on the dimensional accuracy at the end portion corresponding to the three mating portions of the gasket,
In addition, the requirement for the dimensional accuracy of the gasket can be relaxed.

A bent portion 3 formed between at least one pair of cuts 2 and 2 provided at an edge adjacent to the three-plane mating portion A of the sheet metal 1 has a receiving space for a sealing material 4 formed therein. As a result, it is possible to easily and surely define the adhesion region of the sealing material 4 and to prevent the sealing material 4 from accidentally falling off.

Further, by using a drawn portion 6 provided at an edge adjacent to the three-plane mating portion A of the thin metal plate 1 as a receiving space for the sealing material 4, the sealing material 4 at the time of mounting the engine can be used. Extrusion toward the mating portion A side can be performed more reliably.

Furthermore, the space of the half or full bead 7 or 8 formed along the edge of the thin metal plate 1 on the gear case side and adjacent to the three-plane mating portion A is filled with the sealing material 4.
As a result, it is possible to increase the tightening surface pressure at the edge on the gear case side and to omit the operation of separately forming the receiving space for the seal member 4. In addition, by forming the height of the half or full bead 7 or 8 adjacent to the three-surface mating portion A higher than the overall height of the bead, the sealing material 4 moves toward the three-surface mating portion A side. Can be more reliably extruded.

Further, the sealing member 4 is constituted by a plurality of metal sheets laminated on each other, and the metal sheet 1a is arranged on the bottom side of the receiving space of the metal sheet 1, so that the sealing material 4 is provided between the metal sheets 1 and 1a. The sealing material 4 can be securely held by being sandwiched, and the sealing material 4 can be prevented from being inadvertently damaged or dropped when it is not mounted, and the advantage as a laminated gasket can be obtained if necessary. Can be formed into a provided gasket.

[Brief description of the drawings]

FIG. 1 is a view for explaining a three-plane mating portion to which a gasket of the present invention is applied.

FIG. 2 is a diagram for explaining a seal in a three-plane matching portion.

FIG. 3 is a view similar to FIG. 2 for explaining a seal in a three-plane matching portion.

FIG. 4 is a partial perspective view schematically illustrating a metal cylinder head gasket according to an embodiment of the present invention.

FIG. 5 is a schematic partial cross-sectional view for explaining a use state of the metal cylinder head gasket of FIG.

FIG. 6 is a view similar to FIG. 5, showing a compression use state of the metal cylinder head gasket of FIG. 4;

FIG. 7 is a view similar to FIG. 4, schematically illustrating a metal cylinder head gasket according to another embodiment of the present invention.

FIG. 8 is a view similar to FIG. 4, schematically illustrating a metal cylinder head gasket according to still another embodiment of the present invention.

FIG. 9 is a partial sectional view schematically showing a modification of the embodiment shown in FIG. 8;

FIG. 10 is a view similar to FIG. 4, schematically illustrating a metal cylinder head gasket according to still another embodiment of the present invention.

FIG. 11 is a view similar to FIG. 4, schematically illustrating a metal cylinder head gasket according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal thin plate 2 Cut 3 Bending part 4 Sealing material 6 Drawing part 7 Half bead 8 Full bead

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Separate role Shigesao 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Hideki Muramatsu Nissan Motor Co., Ltd., 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa

Claims (6)

[Claims] 1. A cylinder head gasket for use in an engine having an integrated front cover,
A receiving space for attaching a soft sealing material is provided at a portion of the metal sheet adjacent to the three-plane mating portion, and the sealing material is mounted on the engine. A metal cylinder head gasket characterized in that a gap between a front cover, a cylinder head and a cylinder block is filled by a compressive force at the time. 2. The receiving space is formed by bending at an appropriate angle a portion defined between at least one pair of cuts extending inwardly and spaced from each other from an edge adjacent to the three-faced portion of the sheet metal. The metal cylinder head gasket according to claim 1, wherein the gasket is formed by processing. 3. The metal sheet of claim 3, wherein the receiving space has an opening at an edge adjacent to a three-plane matching portion of the metal sheet.
2. The metal cylinder head gasket according to claim 1, wherein the metal cylinder head gasket is formed by drawing from an adjacent edge of the surface mating portion to an inner portion. 4. The metal cylinder head gasket according to claim 1, wherein the receiving space is a space on an inner surface side of a portion adjacent to a three-faced portion of a half or full bead formed in a thin metal plate. 5. The height of a portion of the half or full bead metal sheet adjacent to the three-plane matching portion is formed to be higher than the overall height of the half or full bead. Metal cylinder head gasket. 6. The metal cylinder head according to claim 1, further comprising at least one sheet metal laminated on a bottom side of a receiving space of the sheet metal. gasket.