JPH0240348Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a metal laminated gasket, and more specifically, to an improvement of a metal laminated gasket installed between a cylinder block and a cylinder head of an internal combustion engine. It is related to.

[Prior Art] Conventionally, a metal laminated gasket installed between a cylinder block and a cylinder head of an internal combustion engine is made by laminating a plurality of metal plates, as illustrated in FIG. Outer plates 1 and 2 and middle plate 3,
Although the gasket is assembled by fitting the gaskets 4 and 5 together, the outer peripheral edge 7 of the gasket is generally not coated with any coating, except for the combustion chamber hole sealing portion 6 and other hole sealing portions. Sometimes, as shown in FIGS. 6 and 7, there is a structure in which the upper and lower outer panels 1 and 2 enclosing the middle panel 3 are tied together by folding back a protrusion 2a formed on a part thereof. be.

However, among the conventional metal laminated gaskets shown in FIGS. 5 and 7, the outer peripheral edge of the former is prone to bending due to transportation, transportation, etc. before being assembled into an internal combustion engine. This may cause deformation such as unevenness, which may impede the accuracy of the gasket. Moreover, since the latter only binds the upper and lower outer plates 1 and 2 by folding, the middle plate 3 is not constrained and the sealing surface pressure may lack uniformity.

[Problem that the invention attempts to solve]

The problem to be solved by the present invention is to prevent deformation of the gasket structure, increase rigidity, and improve sealing performance in a metal laminated gasket constructed by laminating a plurality of metal plates.

[Means for solving problems]

In order to achieve the above object, the gasket of the present invention is a metal laminated type gasket assembled by laminating several metal plates and enclosing the middle plate with the outer plate of the metal plates. Protrusions are provided at multiple locations on the outer peripheral edge, and when these protrusions are folded back onto the other outer panel and the stacked middle plates are fixed together, the inner plate is provided with protrusions that are approximately the same shape as the above-mentioned folding protrusions. ,
It is constructed by providing a cutout portion that is slightly larger than the cutout portion, and by forming the laminated thickness of the intermediate plate provided with the cutout portion to be the same as or slightly thicker than the thickness of the protruding piece.

[Effect]

In the metal laminated gasket mentioned above, the plurality of middle plates are completely fixed in place by folding back the protrusions, eliminating irregularities, deformation, and loss of accuracy on the outer peripheral edge of the gasket, and expanding the surface of contact with the engine. At the same time, uniform sealing surface pressure is obtained and the sealing effect is increased.

〔Example〕

FIG. 1 and FIG. 2 show an embodiment of the metal laminated gasket according to the present invention, and this metal laminated gasket consists of upper and lower outer panels 11 and 12, and a plurality of inner panels enclosed between them. It includes plates 13, 14, and 15. The gasket described above is the same as the conventional gasket described above in that it has the combustion chamber hole sealing portion 16 and other hole sealing portions, but it has the characteristic configuration described below.

That is, the lower outer plate 12 of the gasket
has projections 12a, 1 at multiple locations on its outer peripheral edge.
2a... are provided, and these projecting pieces 12a, 12a,
... is folded back onto the upper outer panel 11 and the stacked middle panels 13, 14, 15 are fixed together, but when this is fixed, the middle panels 13 stacked on the upper outer panel 11 and the center The lower outer plate 12 is attached to the middle plate 14 of
Notches 13a and 14a are provided which are approximately the same shape as the folding protrusion 12a and slightly larger than the folding protrusion 12a, so that when the protrusion 12a of the lower outer panel 12 is folded back, the upper outer panel 11 is pressed. Missing part 1 of middle plate
3a and 14a, and the surface of the outer panel 11 and the protruding piece 1
2a so that the surfaces are almost in the same plane,
They are molded and fixed.

In addition, when folding back the projecting piece 12a of the outer plate 12 to fix the laminated plate, the laminated thickness T ₁ of the middle plates 13 and 14 provided with the missing parts 13a and 14a is
When a gasket with the thickness T ₂ of the protruding piece 12a equal to or slightly thicker than that of the protruding piece 12a folded back is mounted on an engine and tightened, the folded protruding piece 12a will be folded back as shown in FIG. The structure is such that the gasket surface can be made uniform despite the presence of the gasket.

The missing portion provided in the intermediate plate may be provided on the entire intermediate plate, or may be provided on a portion thereof as shown in the figure.

The density with which the protrusions 12a are provided on the outer periphery of the gasket depends on the overall size of the gasket,
Although it varies depending on the number of laminated plates, etc., it is determined empirically within the range that can achieve the desired effect, such as increasing the rigidity of the entire gasket and suppressing the occurrence of irregularities in the middle plate. It is.

The second embodiment of the present invention shown in FIG. 4 has almost the same structure as the above-mentioned embodiment, but has a cutout in the cutouts 13a and 14a provided in a part of the middle plate. A bead 17 whose tip is in contact with the inner surface of the outer plate 11 is provided on the middle plate 15 which is not covered.
This bead 17 is effective for holding the outer plate 11 and the protruding piece 12a at predetermined positions in the missing parts 13a and 14a.

In addition, although the case where the protruding piece 12a is provided on the lower outer plate 12 and is turned back onto the upper outer plate 11 has been described above, it is of course possible to form the projecting piece 12a upside down.

When the gasket is configured in this way, the plurality of middle plates 13, 14, and 15 are completely fixed together, so compared to conventional gaskets, there are no problems such as irregularities in the outer peripheral edge of the gasket, deformation, and decreased accuracy. can be resolved. Therefore, uniform sealing surface pressure can be obtained at the joint surface with the engine, and the sealing effect can be increased.

[Effect of idea]

According to the metal laminated gasket of the present invention described in detail above, by fixing the outer periphery of the gasket made of laminated metal plates at multiple locations, the rigidity of the entire gasket is increased, and it is It is possible to eliminate inconveniences such as unevenness of the middle plate caused by the gasket, and to obtain a highly accurate gasket.

In addition, compared to conventional gaskets as shown in Figures 6 and 7, the sealing performance can be improved due to uniform surface pressure on the joint surface that is pressed between the cylinder block and cylinder head. .

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a cutaway perspective view of the main parts taken along the line A-A in Fig. 1, and Fig. 3 shows the tightened state of the gasket shown in Fig. 2. 4 is a perspective view of another embodiment at the same position as in FIG. 2; FIG. 5 is a perspective view of a main part of the conventional example; Figure 7 is the 6th
It is a fragmentary perspective view of the main part cut away at the BB position in the figure. 11, 12... Outer plate, 13, 14, 15... Middle plate, 12a... Protruding piece, 13a, 14a... Missing part, 17... Bead.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a metal laminated gasket assembled by laminating several metal plates and enclosing the middle plate with the outer plate of the metal plates, the outer peripheral edge of one of the outer plates When protruding pieces are provided at multiple locations and these protruding pieces are folded back onto the other outer plate to secure the laminated middle plates together, the entire or part of the middle plate is provided with approximately the same shape as the folding protrusions mentioned above. It is characterized by providing a cutout portion having the same shape but slightly larger than the cutout portion, and forming the laminated thickness of the middle plate provided with the cutout portion to be the same as or slightly thicker than the thickness of the protruding piece. Metal laminated gasket. 2 Claim No. 1 for registration of a utility model, characterized in that, in the missing part provided in a part of the middle plate, a bead is provided in the middle plate that does not have the missing part to properly hold the folded projecting piece. Metal laminated gasket as described in .