JP2573548Y2 - Composite gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gasket to be interposed between a cylinder block and a cylinder head.

[Conventional technology]

Conventionally, for example, as shown in FIG. 11, a member 1 with a flange 1A and a member 2 with a flange 2A are tightened and connected by a bolt 4 and a nut 5, but in this case, they are opposed to each other. A gasket 3 'is interposed between the flanges 1A and 2A which are arranged at a predetermined distance for sealing.

 The bolting is performed at a required interval.

[Problems to be solved by the invention]

However, according to such conventional means, the two members 1 and 2 are changed depending on the difference in flange rigidity and the distance from the fastening bolt.
Of the so-called “center gap G in tightening around the object (twelfth
(See Fig.)).

The present invention has been made in view of such a problem, and in the case where the contact pressure differs depending on the distance from the fastening bolt, etc., by providing gasket members having different plate thicknesses, it is possible to prevent leakage or the like from occurring. It is another object of the present invention to provide a composite gasket.

[Means for solving the problem]

In order to achieve the above object, the composite gasket of the present invention is a gasket for a cylinder head, which is interposed between the opposing surfaces of the cylinder block and the cylinder head and is fastened by bolts, wherein the gasket has a thick plate. A first gasket member, a second gasket member having a smaller thickness than the first gasket member, and a connecting portion for integrally connecting the first gasket member and the second gasket member at required places. A gasket member and a second gasket member are provided such that a part thereof is exposed from an inner peripheral edge portion and an outer peripheral edge portion of the cooling passage or the lubrication passage between the opposed surfaces of the cylinder block and the cylinder head, respectively. The connecting portion connects the first gasket member and the second gasket member to each other and the first gasket member and the second gasket portion. In the first embodiment, the first gasket member and the second gasket member are exposed in the cooling passage or the lubricating passage by being integrally connected at the respective locations exposed to the cooling passage or the lubricating passage. However, the present invention is characterized in that the first gasket member is set so as to be interposed farther from the bolt than the second gasket member.

[Action]

The above-described composite gasket of the present invention is interposed between the opposing surfaces of the cylinder block and the cylinder head for sealing, and has a first gasket member having a large thickness and a second gasket member having a smaller thickness than the first gasket member. The gasket member and the gasket member are integrally connected at a required place via a connecting portion. here,
The first gasket member and the second gasket member are:
The first gasket member and the second gasket member are disposed such that a part thereof is exposed from an inner peripheral edge and an outer peripheral edge of a cooling passage or a lubrication passage between opposed surfaces of the cylinder block and the cylinder head. The gasket member is integrally connected at each of the first gasket member and the second gasket member at respective locations where the gasket member is exposed to the cooling passage or the lubricating passage, whereby the connecting portion is exposed in the cooling passage or the lubricating passage. You. As a result, the excitement between the members is reliably sealed to prevent leakage or to prevent biting between the cylinder head and the cylinder block.

〔Example〕

1 to 7 show a first embodiment of the present invention. FIG. 1A is a horizontal sectional view of a cylinder block to which the gasket is mounted. [FIG. 1 (b) is a cross-sectional view taken along the line IVa-IVa], and FIG. 1 (b) is a partial vertical cross-sectional view of the cylinder block to which the gasket is attached [FIG. 1 (a) is a cross-sectional view taken along the line IVb-IVb] FIG. 2, FIG. 2 is a partial cross-sectional view showing the mounting state of the present gasket, and FIGS. 3 to 7 are partial cross-sectional views showing the mounting state of the gasket, which is different from the one shown in FIG. It is.

By the way, the composite gasket 3 according to the first embodiment,
Cylinder block 6 as shown in FIGS. 1 (a) and 1 (b)
Are mounted on the joint surface with the cylinder head 7 (see FIG. 2).

In FIGS. 1 (a) and 1 (b), reference numeral 6A is a bore portion, 6B is a water jacket portion (cooling passage), 6C is a bolt hole, and the bore portion 6A is formed in the center of the cylinder block 6. The water jacket portion 6B is formed coaxially with the bore portion 6A on the outer periphery thereof, and the bolt holes 6C are formed in the cylinder block 6 with an interval of about 90 ° further outside the water jacket portion 6B.

Incidentally, as shown in FIG. 2, the composite gasket 3 includes a first gasket member 3A having a large plate thickness and a second gasket member 3B having a small plate thickness.

The first gasket member 3A is a cylinder block.
6. Inside portion 6A-1, 7A-1 of bore portion 6A of cylinder head 7 which is relatively far from bolt hole 6C and has relatively low adhesion force.
The first gasket member 3B is mounted on the outer portions 6A-2 and 7A-2 of the cylinder block 6 and the cylinder head 7 which are relatively close to the bolt holes 6C and have relatively high adhesion. For this purpose, the first gasket member 3A is configured as a small-diameter ring member, and the second gasket member 3B is configured as a large-diameter ring member.
The gasket members 3A and 3B are integrally connected by partially overlapping the second gasket member 3B with the second gasket member 3B and connecting them with eyelets as shown by reference numeral 3D in FIG.

Here, the fixing portion (connecting portion) 3D formed by the eyelets is a water jacket portion as a cooling passage formed between the cylinder block 6 and the cylinder head 7 disposed opposite to each other.
It is exposed in the part of 6B.

With the above-described configuration, the composite gasket 3 is interposed for sealing between the corresponding surfaces that are arranged opposite to each other when the cylinder block 6 and the cylinder head 7 are joined together by bolting. First gasket member 3A
Is mounted on the bore seal portions 6A-1, 7A-1, and the first gasket member 3B is mounted on the peripheral portions 6A-2, 7A-2. Further, as described above, the fixed portion (connecting portion) 3D is provided in a portion of the water jacket portion 6B between the cylinder block 6 and the cylinder head 7.

That is, the cylinder block 6 and the cylinder head 7
The first gasket member 3A and the second gasket member 3B are interposed at different positions on the peripheral edge of the water jacket 6B between the opposed surfaces of the water jacket 6B. The portion is configured such that the thickness of the gasket 3 is not uniform. Specifically, the thickness is set so that the thickness on the cylinder bore side is thick, and the thickness on the side opposite to the cylinder bore is thin.

As described above, in the case of the first embodiment, even if a difference occurs in the adhesion between the cylinder block 6 and the cylinder head 7 due to the difference in the bolt tightening position, the gasket plate thickness where the adhesion is relatively low is obtained. Because of the large thickness, there is no gap in the surface required for sealing, and as a result, there is no problem such as leakage. In addition, since the seal surface pressure can be adjusted by finely adjusting the plate thickness, the deformation of the bore due to the decrease in the fastening force can be reduced.

In addition, since the fixed portion 3D of the two gasket members generated by the integral connection of the two gasket members is exposed at the water jacket portion 6B, there is no problem even if the fixed portion 3D becomes thicker than both plate thicknesses. . That is, the fixed portion between the cylinder block 6 and the cylinder head 7
The 3D does not bite and therefore does not deform the facing surface.

The connecting portion between the two gasket members may be a rivet-fixed portion 3E as shown in FIG.
As shown in FIG. 4, it may be a fixed portion 3C by welding (including spot welding), or as shown in FIGS. 6 and 7, a fixed portion 3F by curling of a partially bent plate. Further, both gasket members may be fixed using an adhesive.

Further, as shown in FIG. 5, two ring members having the same or almost the same plate thickness but different diameters are prepared, and these ring members are overlapped with each other so that the overlapping portion located inside is the first portion.
The gasket member 3A may be used, and the non-polymerized portion located outside may be used as the second gasket member 3B. In this case, a portion 3G at the boundary between the overlapped portion (first gasket member 3A) and the non-overlaid portion (second gasket member 3B) functions as a connection portion.

In this case, the same effects and advantages as those shown in FIG. 2 can be obtained.

8 to 10 show a second embodiment of the present invention.
FIG. 9 is a plan view of the gasket, FIG. 9 is a partial cross-sectional view showing a fixing portion of the gasket, and FIG. 10 is a plan view of a cylinder block to which the gasket is to be mounted.

Now, the composite gasket 30 according to the second embodiment,
It is mounted on the joint surface of the cylinder block 60 of the in-line four-cylinder engine as shown in FIG. 10 with the cylinder head.

In FIG. 10, reference numeral 60A denotes a bore portion, 60B denotes a water jacket portion, 60C denotes a bolt hole, and 60D denotes a bolt post.
The four bore portions 60A are formed in series in the cylinder block 60, the water jacket portion 60B is formed on the outer periphery so as to surround each bore portion 60A, and the bolt hole 60C is formed in the water jacket portion 60B with the bore portion 60A. Is formed in the vicinity.

As shown in FIG. 8, the composite gasket 30 also includes a first gasket member 30A having a large plate thickness and a first gasket member 30B having a small plate thickness. The difference between the thicknesses of the two gasket members is 0.05 mm, for example.
Set to about.

The first gasket member 30A is mounted on the portion around the bore of the cylinder block 60 and the cylinder head, and the first gasket member 30B is mounted on the outer portion of the cylinder block 60 and the cylinder head. For this purpose, the first gasket member 30A is formed to have substantially the same outer shape as the envelope connecting the four bore portions 60A, and the outer shape of the second gasket member 30B is
0, the outer peripheral shape of the joint surface with the cylinder head or the outer peripheral shape of the joint surface with the cylinder block of the cylinder head is substantially the same as the outer peripheral shape of the first gasket member 30A inside the second gasket member 30B. Cutouts of the same shape are formed.

Then, the first gasket member 30A and the second gasket member 30B are partially overlapped, and as shown by reference numeral 30D in FIG. The parts are connected together.

Here, the fixing portion (connecting portion) 30D formed by the eyelets is exposed to a water jacket portion (cooling passage) 60B as a space formed between the cylinder block 60 and the cylinder head disposed opposite to each other. I have.

An annular bead 30A-1 is formed around each of the bores of the first gasket member 30A, and an annular bead 30B-1 is formed on the outer peripheral portion of the second gasket member 30B. ing.

With the above-described configuration, the composite gasket 30 is also interposed for sealing between the opposing surfaces when the cylinder block 60 and the cylinder head are joined together by bolting. First gasket member 30
A is attached to the bore seal portion, and the second gasket member 30B
Is mounted on the periphery.

As described above, in the case of the second embodiment, even if a difference occurs in the adhesion between the cylinder block 6 and the cylinder head 7 due to the difference in the bolt tightening position, the gasket plate thickness at a position where the adhesion is relatively low. Is thick, and bead 30A-
Due to the presence of 1, there is no gap in the surface required for sealing, and as a result, problems such as leakage do not occur. Further, due to the presence of the bead 30B-1, the sealing function of the peripheral portion of the cylinder block 60 is also improved.

Further, similarly to the first embodiment, by finely adjusting the plate thickness, the sealing surface pressure can be adjusted, so that the deformation of the bore due to the decrease in the fastening force can be reduced, and the joint between the two gasket members can be reduced. 30D fixed part by eyelets as
Is exposed at the water jacket portion 60B, so that there is no problem even if the fixing portion 30D is thicker than both plate thicknesses. That is, the fixed portion 30D does not bite between the cylinder block 60 and the cylinder head, and therefore, no opposing surface is formed.

Further, in the case of the second embodiment, the thickness of each cylinder can be set and followed according to the difference in the adhesion between the cylinder block 6 and the cylinder head 7 of each cylinder.

The connecting portion between the two gasket members may be a fixed portion 30D formed by caulking as shown in FIG. 9, but other than the fixed portion formed by rivets as in the first embodiment described above (corresponding to FIG. 3). 4), and may be a fixed portion by welding (including spot welding) (corresponding to FIG. 4), or a fixed portion by curling of a partially bent plate (corresponding to FIGS. 6 and 7). ), And both gasket members may be fixed with an adhesive. Further, two plate members having the same or substantially the same plate thickness but different sizes are prepared, these plate members are stacked, and the overlapped portion located inside is used as the first gasket member 30A, and the outside is used as the first gasket member 30A. The non-polymerized portion located at the second gasket member 30
When used as B, the boundary between the above-mentioned polymerized portion and non-polymerized portion may be used as a connecting portion (corresponding to FIG. 5).

Even in this case, substantially the same effects and advantages as those shown in FIG. 9 can be obtained.

In the first and second embodiments, the fixed portions (connection portions) of both gasket members may be exposed to oil holes (lubrication passages) instead of water holes (cooling passages). Further, in each of the above embodiments, the base material for the first gasket members 3A, 30A and the second gasket members 3B, 30B is either a metal gasket or a soft gasket (asbestos joint sheet or beater sheet). ), And the combination of these substrates can be freely determined. That is, the first
The second gasket member may be a metal gasket member or a soft gasket member.
One of the gasket member and the second gasket member may be used for a metal gasket, and the other of the first gasket member and the second gasket member may be used for a soft gasket.

[Effect of the invention]

As described above in detail, according to the composite gasket of the present invention, in the gasket for the cylinder head which is fastened by the bolts interposed between the opposed surfaces of the cylinder block and the cylinder head, the gasket has a plate thickness. A first gasket member having a large thickness, a second gasket member having a smaller thickness than the first gasket member, and a connecting portion for integrally connecting the first gasket member and the second gasket member at required places. The first gasket member and the second
A gasket member is provided such that a part thereof is exposed from an inner peripheral edge portion and an outer peripheral edge portion of the cooling passage or the lubricating passage between the opposed surfaces of the cylinder block and the cylinder head, and the coupling portion is provided. By connecting the first gasket member and the second gasket member integrally at each of the first gasket member and the second gasket member at locations where they are exposed to the cooling passage or the lubrication passage, the cooling passage or The first gasket member and the second gasket member are exposed in the lubrication passage, and the positional relationship between the first gasket member and the second gasket member is such that the first gasket member is interposed farther from the bolt than the second gasket member. The first and second gaskets each have a thickness corresponding to the adhesion between the sealing surfaces after fastening the bolts. It is possible to ensure the sealing surface pressure between Le surfaces, an effect of preventing the leakage or the like of the compressed gas and the cooling water.

Further, by exposing the connecting portion in the cooling passage or the lubricating passage, for example, even if the thickness of the connecting portion becomes thicker than that of the first gasket member due to swelling of eyelets, rivets, welded meat, adhesive and the like. Since no biting occurs between the cylinder head and the cylinder block, the sealing surfaces of the first gasket member and the second gasket member are integrally joined without forming a gap, and compressed gas and cooling water are not formed. Problems such as leakage can be prevented from occurring.

[Brief description of the drawings]

1 to 7 show a first embodiment of the present invention. FIG. 1 (a) is a horizontal cross-sectional view of a cylinder block to which the gasket is mounted [viewed along IVa-IVa in FIG. 1 (b)]. 1 (b) is a partial vertical sectional view of a cylinder block to which the present gasket is mounted [a sectional view taken along the line IVb-IVb in FIG. 1 (a)], and FIG. 2 is a mounting state of the present gasket. FIGS. 3 to 7 are partial cross-sectional views showing mounting states of a gasket in which the fixing means between the two gasket members is different from that shown in FIG. 2, and FIGS. 8 to 10 show the present invention. FIG. 8 shows a plan view of the present gasket, and FIG.
FIG. 10 is a partial cross-sectional view showing a fixed portion of the present gasket, FIG. 10 is a plan view of a cylinder block to which the present gasket is to be mounted, and FIG. 11 is a partially broken view showing a state where the conventional gasket is mounted. FIG. 12 is a schematic cross-sectional view showing the XV portion of FIG. 11 in an enlarged scale. 1,2 …… Flanged member, 1A, 2A …… Flange, 3 ……
Composite gasket, 3A: first gasket member, 3B: second gasket member, 3C to 3G: fixed part (connection part),
3 'gasket, 4 bolts, 5 nuts, 6
…… Cylinder block, 6A …… Bore part, 6B …… Water jacket part (cooling passage), 6C …… Bolt hole, 7 ……
Cylinder head, 6A-1, 7A-1 ... Bore seal part, 6A-
2,7A-2: Peripheral part, 30: Composite gasket, 30A ...
First gasket member, 30A-1 ... Bead, 30B ... Second
Gasket member, 30B-1 bead, 30C fixed part (connection part), 60 cylinder block, 60A bore part, 60B water jacket part (cooling passage), 60C
... bolt holes, 60D ... bolt columns.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Yamamoto 2-6-5 Asari, Toyonaka-shi, Osaka Domestic Parts Industry Co., Ltd. (56) References JP-A-54-132213 (JP, A) 60-37660 (JP, U) Full opening 1986-99656 (JP, U) Full opening 61-77471 (JP, U) Full opening 58-163754 (JP, U) Full opening 1983-175156 (JP, U U) Jiko 55-14760 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A gasket for a cylinder head which is interposed between opposed surfaces of a cylinder block and a cylinder head and is fastened by bolts, wherein the gasket comprises a first gasket member having a large plate thickness;
A second gasket member having a smaller thickness than the first gasket member; and a connecting portion for integrally connecting the first gasket member and the second gasket member at required places. The gasket member is
From the inner peripheral edge and the outer peripheral edge of the cooling passage or the lubrication passage between the opposed surfaces of the cylinder block and the cylinder head,
The connection part is provided so that a part thereof is respectively exposed, and the connecting portion transfers the first gasket member and the second gasket member to the cooling passage or the lubricating passage in the first gasket member and the second gasket member. By being integrally connected at each of the exposed portions, the exposed portions are exposed in the cooling passage or the lubricating passage, and the arrangement relationship between the first gasket member and the second gasket member is as follows. A composite gasket, wherein the composite gasket is set so as to be interposed and disposed further away from the bolt than the second gasket member.