JP3694403B2 - Multilayer metal gasket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder head gasket for use in an engine having an integrated front cover, and in particular, as shown in FIGS. 1 to 3, a joint surface between a cylinder head H and a cylinder block B of the engine, and a cylinder head H The joint surface between the cylinder block B and the front cover C relates to a multilayer structure metal gasket having a seal structure in a portion A adjacent to each other (hereinafter referred to as “three-sided joint portion”). .
[0002]
[Prior art]
As is well known, the cylinder head H and the cylinder block B are sealed by a cylinder head gasket mounted between them, and a front cover that forms a timing chain case T between the cylinder head H and the cylinder block B. A gap between C and the cylinder head H and the cylinder block B is sealed by a liquid gasket L applied between them.
[0003]
On the other hand, for example, as shown in FIG. 2, the seal at the three-surface mating portion A is such that the edge of the cylinder head gasket G facing the front cover C is against the joint surface of the cylinder head H and / or the cylinder block B. When it is located inward, a gap S1 is formed between the front cover C and the cylinder head gasket G. On the other hand, for example, as shown in FIG. Between the cylinder head H and / or the cylinder block B and the front cover C, when the end edge of the cylinder head H and / or the cylinder block B protrudes outward. A gap S2 is created. If the size of such a gap exceeds the gap allowable limit that can be filled with the liquid gasket, the sealing function by the liquid gasket is not exhibited, and oil leakage occurs. Therefore, the seal at the three-surface mating portion A is greatly influenced by the processing accuracy of each joint surface of the front cover C, the cylinder head H and the cylinder block B, the processing accuracy at the end portion of the gasket facing the front cover C, and the like. It was a thing.
[0004]
Further, the liquid gasket L easily loses its sealing function due to repeated thermal expansion and contraction of the front cover C, the cylinder head H and the cylinder block B during actual operation, and oil leakage is likely to occur. In addition, the liquid gasket L is poor in work efficiency because it takes time to dry and generate a sealing function, and has poor maintenance because it takes time to peel off the liquid gasket during engine disassembly and assembly. For this reason, the manufacturing cost and the maintenance cost have increased.
[0005]
[Problems to be solved by the invention]
The present invention aims to provide a multi-layered metal gasket capable of reliably performing sealing at the three-surface mating portion without considering the dimensional accuracy at the end portion corresponding to the three-surface mating portion of the gasket. .
[0006]
[Means for Solving the Problems]
The multilayer structure metal gasket according to the present invention is a cylinder head gasket for use in an engine having an integral front cover, and is composed of at least two laminated metal sheets. One of the thin metal plates is formed with a notch at a portion adjacent to the three-surface mating portion, and when the elastic member having a high compression characteristic is attached to the engine, the front cover and the cylinder head and / or Or it is provided so that it may fill between cylinder blocks.
[0007]
In addition, the multilayer metal gasket according to the present invention can be constituted by at least three metal thin plates laminated on each other, and at this time, the intermediate metal thin plate has a notch at a portion adjacent to the three-surface joining portion. An elastic member having a high compression characteristic is formed in the notch so as to fill a space between the front cover and the cylinder head and / or the cylinder block when the engine is mounted on the engine.
[0008]
In the multilayer metal gasket according to the present invention, the elastic member is disposed in a region up to the outer peripheral edge adjacent to the three-sided joining portion of the thin metal plate not having a notch, and the thickness of the elastic member or the thickness of each elastic member. The total thickness can be made thicker than the thickness of the thin metal plate having the notches. This prevents the elastic member from protruding from the outer peripheral edge portion adjacent to the three-surface mating portion of the metal thin plate during assembly of the engine and interfering with the alignment between the parts, and after tightening, the front cover and the cylinder head and / or Alternatively, it is filled between the cylinder blocks to ensure the sealing of the three-surface mating part.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
[Example 1]
As shown in FIGS. 4 and 5, the multilayer metal gasket according to the embodiment of the present invention is composed of two thin metal plates 1a and 1b laminated together. The metal thin plates 1a and 1b have a required planar shape corresponding to the engine to be applied, and one of the metal thin plates (in the illustrated case, the metal thin plate 1a) is adjacent to the three-surface mating portion A. A notch 2 is formed at the site. The cutout 2 is provided with an elastic member 3 having high compression characteristics.
[0010]
The elastic member 3 is preferably disposed so as to be located in a region up to the outer peripheral edge portion P adjacent to the three-surface mating portion of the thin metal plate 1b in the notch 2 and without the notch. For this reason, although it does not specifically limit, it is desirable to arrange | position the elastic member 3 to a metal thin plate by coating by a conventional printing technique. On the other hand, the thickness of the elastic member 3 is such that the gap between the front cover C and the cylinder head H and / or the cylinder block B, as shown in FIG. In order to ensure a sufficient amount for filling, it is preferable that the metal thin plate 1a having a notch is attached to be thicker than the thickness.
[0011]
The gasket of the present invention configured as described above is mounted on the engine in the same manner as a known gasket, but as shown in FIG. 6, the clamping force between the Linder head H and the cylinder block B Is added, the elastic member having a high compression characteristic is elastically deformed and extends outward beyond the outer peripheral edge portion P of the metal thin plate, and the gap between the three-surface mating portion A is filled and securely sealed. Can do. Therefore, it is possible to eliminate the need for applying the liquid gasket, which is necessary when the gasket is installed, and to completely avoid the labor and cost increase associated with the application of the liquid gasket.
[0012]
[Example 2]
FIG. 7 is a view showing a multi-layered metal gasket according to another embodiment of the present invention, in which the thin metal plates laminated in the embodiment described above are formed of a thin metal plate 1a having a notch 2 and a thin metal plate. 1a and 1b ″, and elastic members 3a and 3b are provided on the thin metal plates 1b ′ and 1b ″, respectively. Is different.
[0013]
The elastic members 3a and 3b are formed in the region up to the outer peripheral edge portion P adjacent to the three-surface mating portion of the thin metal plates 1b 'and 1b "in the notch 2 and without the notch, as in the above embodiment. The elastic members 3a and 3b are disposed so as to be positioned so that the total thickness of both elastic members 3a and 3b is larger than the thickness of the thin metal plate 1a having the cutout portion. When the gasket is attached to the engine and tightened, the elastic members 3a and 3b ensure a sufficient amount to fill the gap between the front cover C and the cylinder head H and / or the cylinder block B.
[0014]
【The invention's effect】
According to the present invention, a notch portion is formed in a portion adjacent to the three-surface mating portion of one metal thin plate, and an elastic member having high compression characteristics is provided in the notch portion, so that the front when mounted on the engine. Since the space between the cover and the cylinder head and / or the cylinder block is filled, the sealing at the three-surface mating portion can be surely performed without considering the dimensional accuracy at the end portion corresponding to the three-surface mating portion of the gasket. it can.
[0015]
In addition, it is composed of a thin metal plate in which a notch is formed and two thin metal plates that are laminated on each surface side of the thin metal plate, and by providing an elastic member on each thin metal plate on each surface side, Since the thickness of each elastic member can be made thinner than the thickness of the intermediate metal thin plate, the elastic member can be arranged by coating by a conventional printing technique, and furthermore, at the three-surface joining portion of the metal thin plate It can be easily and reliably disposed in the region in the notch to the adjacent outer peripheral edge portion.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining a three-surface mating portion to which a gasket of the present invention is applied.
FIG. 2 is a diagram for explaining a seal in a three-surface mating portion.
FIG. 3 is a view similar to FIG. 2 for explaining the seal at the three-surface mating portion.
FIG. 4 is a partial plan view showing a multi-layered metal gasket according to an embodiment of the present invention.
FIG. 5 is an enlarged cross-sectional view taken along line II-II in FIG.
6 is a partial cross-sectional view similar to FIG. 2 for explaining a usage state of the gasket shown in FIG. 1;
7 is a partial cross-sectional view similar to FIG. 2, illustrating a multilayer metal gasket according to an embodiment of the present invention.
[Explanation of symbols]
1a, 1b, 1b ', 1b "Metal thin plate 2 Notch 3, 3a, 3b Elastic member A 3 face-matching part C Cylinder block C Front cover H Cylinder head P Outer peripheral edge part

Claims (1)

A cylinder head gasket for use in an engine having an integral front cover, which is composed of at least three mutually laminated metal thin plates, and the intermediate metal thin plate has a notch in a portion adjacent to the three-surface mating portion. An elastic member having a high compression characteristic is formed in the notch so as to fill a space between the front cover and the cylinder head and / or the cylinder block when the elastic member is mounted on the engine. It is divided into two members so as to be located in the region up to the outer peripheral edge part adjacent to the three-surface mating portion of each thin metal plate, and the total thickness of the elastic members provided on each thin metal plate is notched A multilayer structure metal gasket characterized by being thicker than the thickness of a thin metal plate having a portion .

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