JPH06337070A - Laminated gasket - Google Patents

Abstract

PURPOSE:To provide a laminated gasket having an identification sign easily visible from outside without impairing the workability even after fitted to an engine, regarding at least one substrate of the gasket. CONSTITUTION:A plurality of substrates 10, 20 and 30 are formed to be almost rectangular, having at least cutout sections 10f and 20f with at least one corner section cut out. Also, at least one substrate 30 among a plurality of the substrates 10, 20 and 30 is provided with a projection 30a along the outline of the cutout sections 10f and 20f, and identification signs 33 to 37 are arranged in a row along the outline of the sections 10f and 20f.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a laminated gasket,
Particularly, the present invention relates to a laminated gasket suitable for a cylinder head gasket of an internal combustion engine.

[0002]

2. Description of the Related Art In a laminated gasket formed by laminating a plurality of substrates, one or several adjusting substrates are appropriately selected from several kinds of adjusting substrates in order to obtain an optimum thickness for an engine to be mounted. For example, it is supposed to be interposed between a pair of substrates. As an identification mark when selecting a specific substrate from such several kinds of adjustment substrates, for example, an actual flat plate 1-17
In the metal laminated gasket described in Japanese Patent No. 3569, it is configured by laminating a plurality of metal plates, and a notch for thickness identification is provided in a part of the metal plate for thickness adjustment, and other metal plates are provided. It is supposed to provide a see-through notch exposing the notch for identification.

On the other hand, as an erroneous assembly discrimination structure of a metal laminated gasket, structures similar to Japanese Utility Model Publication No. 2-37326 and Japanese Patent Publication No. 2-58501 are disclosed, respectively. That is, in the former case, in a metal laminated gasket formed by stacking a plurality of constituent plates on top of each other, at least a part of one surface of each constituent plate is sequentially arranged in a staircase pattern and exposed to the outside. At least part of one side of the plate is exposed to the outside. In any of these cases, it is possible to easily determine the combined state of the gasket constituent materials and always provide the product as designed.

[0004]

The erroneous assembly discriminating structure described in the above publication is to provide an exposed portion on each component plate so that the order of superposing a plurality of component plates is as designed. Therefore, it is necessary to provide the exposed portions in different shapes or different positions for each of the constituent plates.

On the other hand, in the metal laminated gasket described in Japanese Utility Model Laid-Open No. 1-173569, it is necessary to identify the thickness and the like even when one adjustment substrate is interposed. There is. That is, while the structure described in the above-mentioned publication is intended for relative discrimination between a plurality of laminated plates, in Japanese Utility Model Laid-Open No. 1-173569.
For the purpose of absolute discrimination of the adjustment substrate to be interposed, the adjustment metal plate is provided with an identification notch. However, in the same publication, the plurality of metal plates have the same outer shape, and a perspective cutout for exposing the identification cutout of the adjustment metal plate to another metal plate having no identification cutout. Since it is provided, the identification notch cannot be seen from the outside after the gasket is attached to the engine.

For this reason, it is desirable that the adjusting substrate is provided with a projecting portion and a plurality of holes are formed therein. According to this, the identification hole can be confirmed from the outside even after the laminated gasket is mounted on the engine. However, if a plurality of identification holes are provided in a row in view of the ease of identification, the protrusion must be made large. For example, when the protrusion extending from the side of the gasket is formed as described in the above-mentioned publication of the misassembly discrimination structure, the workability after mounting on the engine is impaired. For this reason, the protrusion must be formed small,
Then, the number of the identification holes is limited, or the size and arrangement of the identification holes are forced to be changed, and the visibility is lowered.

Therefore, in the present invention, in a laminated gasket formed by laminating a plurality of substrates, at least one substrate can be easily visually identified from the outside without impairing workability even after being mounted on an engine. It is intended to provide a laminated gasket provided with a marker.

[0008]

In order to achieve the above-mentioned object, the present invention provides a laminated gasket formed by laminating a plurality of substrates, in which at least one corner of the plurality of substrates is cut off. With a substantially rectangular shape having
Providing at least one substrate of the plurality of substrates with a protruding portion along the outer shape of the cutout portion, and providing the protruding portion with identification marks in a line along the outer shape of the cutout portion. It was done. As the identification mark, an identification hole in which a plurality of holes are formed in a line along the outer shape of the cut portion is desirable.

[0009]

In the laminated gasket having the above structure,
A substrate having a desired thickness is selected according to a gap between the joining members, for example, a cylinder head and a cylinder block of the internal combustion engine, and the substrate is interposed between, for example, two substrates to form a three-layer laminated gasket. To be done. At this time, a protruding portion is formed along the outer shape of the cut portion at a corner of the intermediate substrate, and the protruding portion is provided with an identification mark indicating the thickness, for example, in a line. Therefore, when constructing the laminated gasket, the substrate having a desired thickness can be easily selected visually, and the identification mark can be confirmed from the outside even after the laminated gasket is interposed between the joining members.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the laminated gasket of the present invention will be described below with reference to the drawings. 1 to 4 relate to an embodiment of the present invention, and FIG. 3 shows the entire laminated gasket 1. As shown in FIG. 4, the laminated gasket 1 of this embodiment is used as a cylinder head gasket interposed between a cylinder head 3 and a cylinder block 4 of a diesel engine with a secondary combustion chamber. This laminated gasket 1 has a first substrate 10 and a second substrate 20 which are formed of an elastic metal plate, for example, a stainless steel plate (SUS) in a substantially rectangular shape, and an intermediate plate 30 is interposed between them, It is composed of layers.

A plurality of (for example, four for an in-line four-cylinder internal combustion engine) combustion chamber holes 11 and 21 corresponding to the number of cylinders are bored in a row on the first and second substrates 10 and 20, respectively. (Only the combustion chamber hole 21 is shown in FIG. 3), and the four corners are cut to form cut portions 10f and 20f. In addition, as shown in FIG. 3, the first and second substrates 1
A plurality of cooling water holes 22 (12) and blow-by holes 25 (15) are bored in Nos. 0 and 20, and a plurality of bolt holes 26 (16) are bored around the combustion chamber holes 21. (In FIG. 3, only one place is labeled). The first
Although the cooling water holes 12 and the like of the substrate 10 are not shown in FIG. 3, they are formed similarly to the second substrate 20. Further, in order to join the first and second substrates 10 and 20, caulking holes 19 and 29 are provided at the outer peripheral ends of each, and caulked and fixed by eyelets 50.

An annular bead is formed on each of the combustion chamber holes 11 and 21 of the first and second substrates 10 and 20 and the peripheral portion surrounding the portion 20P facing the auxiliary combustion chamber member (not shown) when the engine is mounted. As shown in FIG. 4, the first and second substrates 10 and 20 from the annular beads 13 and 23 to the combustion chamber holes 11 and 21 have flat open end portions, respectively. 10a and 20a are formed. A pressing bead 24, which is independent of the annular bead 23, is formed at the opening end 20 a of the second substrate 20. Further, as shown in FIG. 3, beads are also formed around the bolt holes 16 and 26 and the blow-by holes 15 and 25, and further, the first bead is formed.
And outer peripheral beads 18, 2 on the outer periphery of the second substrate 10, 20.
8 is formed. These outer peripheral beads 18 and 28 are composed of inclined portions and have a shape half that of the annular beads 13 and 23, and are therefore called half beads.

Further, a so-called shim ring 40, which is a metal ring, for example, an annular spacer of a stainless steel plate, is fixed to the opening end portion 20a of the second substrate 20. That is, as shown in FIG. 4, a shim ring 40 having a thickness substantially equal to the height of the annular bead 23 is entirely formed on the peripheral edge portion of the combustion chamber hole 21 of the opening end portion 20a of the second substrate 20 by a laser welding machine, for example. It is welded substantially continuously over the circumference. Therefore, a continuous weld (not shown) is formed on the entire circumference of the annular shim ring 40. The thickness of the shim ring 40 is uniform over the entire circumference in this embodiment, but the thickness may be partially changed depending on the surface pressure distribution, or a seal member may be added.

The intermediate plate 30 is, for example, a soft rolled steel plate (S
PC), like the first and second substrates 10 and 20, is formed into a substantially flat plate shape with the corners cut off.
The combustion chamber hole 31 that overlaps with 21, and the same holes as the holes formed in the first and second substrates 10 and 20, though not shown, are formed. A step portion 32 having a flat portion wider than the width of the shim ring 40 and having a predetermined step is formed on the peripheral edge portion of the combustion chamber hole 31 of the intermediate plate 30. The step difference of the step portion 32 is formed smaller than the thickness of the shim ring 40. Then, the first and second substrates 10 and 20
Hva, the hardness of the shim ring 40 is Hvb, and the hardness of the intermediate plate 30 is Hvc. Hva> Hv
b> Hvc.

The intermediate plate 30 has a plurality of different thicknesses,
For example, five sheets are prepared, and the most appropriate one is selected at the time of assembling to be used for adjusting the tightening thickness of the laminated gasket 1. Therefore, a protrusion 30a is formed at one corner of the intermediate plate 30, and an identification mark is provided on the protrusion 30a. That is, in the present embodiment, as shown in FIG. 1 and FIG. 3, one to one in a row along the cutout portions 10f and 20f of the first and second substrates 10 and 20 with respect to the protruding portion 30a of the intermediate plate 30. Five identification holes 33 to 37 are formed so that five kinds of intermediate plates can be identified. For example,
Of the five types of intermediate plates 30 having different thicknesses, the thinnest one is the identification hole 33 in FIG. 1, and the identification holes 34 and 35 are formed in order as the thickness increases, so that the laminated gasket 1 can be mounted. The optimum thickness of the intermediate plate 30 can be easily selected for the desired engine. Further, when the intermediate plate 30 is selected, the cutout portions 10f and 20f are provided on both the first and second substrates 10 and 20, so that the protruding portion does not matter which surface is up. Identification holes 33 to 3 of 30a
7 can be seen.

As is apparent from FIG. 3, the above-mentioned caulking holes 19 and 29 except for one portion are the first and second substrates 10 and 10.
It is contained in a continuous linear outer shape, not in a shape protruding from the outer circumference of 20. Therefore, the outer shapes of the first and second substrates 10 and 20 are simple shapes, which facilitates manufacturing. Further, the caulking holes 19 and 29 are bolt holes for positioning shown in FIG. 3, which are generally called knock holes 26n (first substrate 1
0 and the intermediate plate 30 also have similar knock holes, which are provided in the vicinity of (26n as a representative of these). This is because the first and second substrates 10 and 20 are warped, so that when the laminated gasket 1 is configured with the intermediate plate 30, the knock holes are likely to be misaligned, which makes assembly difficult. This is because, in particular, the vicinity of the knock hole 26n is caulked and fixed by the eyelet 50 so that the knock holes are in a joined state. As shown in FIG. 2, the eyelet 50 is formed so that the flange portions 51 and 52 at both ends have different diameters. That is, the flange portion 51 on the second substrate 20 side that abuts the cylinder head 3 is formed to have a larger diameter than the flange portion 52 on the first substrate 10 side that abuts the cylinder head 4.

With respect to the first and second substrates 10 and 20, the surfaces of the beads 13 and 23 on the protruding side are left as they are, and the surfaces on the opposite side thereof are, for example, unvulcanized with a vulcanizing agent added. It is advisable to form a vulcanized coating layer obtained by vulcanizing a vulcanized fluorocarbon rubber on the entire surface, and then laminate an unvulcanized coating layer thereon.
The unvulcanized coating layer on the vulcanized coating layer can be changed to an unvulcanized coating layer. Here, "non-vulcanized" means that it does not contain a vulcanizing agent, and "unvulcanized" means that it contains a vulcanizing agent but has not been vulcanized. Therefore, for example, unvulcanized rubber has the same properties as unvulcanized rubber in the initial stage, but vulcanization progresses during use to form a strong rubber layer, whereas unvulcanized rubber maintains a flexible state. To be done. Further, the intermediate plate 30 may have unvulcanized coating layers or non-vulcanized coating layers formed on both surfaces thereof.

Thus, the identification hole 3 provided in the intermediate plate 30.
3 to 37, the laminated gasket 1 having a desired thickness is selected, and as shown in FIG. 4, the second substrate 20 is placed on the cylinder head 3 side and is interposed between the cylinder head 3 and the cylinder block 4. To be dressed. Then, the cylinder head 3 and the cylinder block 4 are fixed by bolts (not shown).
When a tightening force is applied between the annular beads 13 and 23,
Is compressed and deformed. Then, when the space between the cylinder head 3 and the cylinder block 4 is tightened and the shim ring 40 and the intermediate plate 30 are compressed, the deformation of the annular beads 13 and 23 does not proceed any further, and the elastic restoring force is applied. The first and second substrates 10 and 20 are in close contact with the cylinder head 3 and the cylinder block 4, respectively, and a predetermined surface pressure is secured.

Even after the laminated gasket 1 is mounted on the engine as described above, the protruding portion 30a of the intermediate plate 30 is provided.
Since the identification holes 33 to 37 formed in the above can be confirmed from the outside, the inspection after mounting can be performed and the replacement is easy. In addition, the protruding portion 30a includes the cut-off portion 10f at the corner,
Since it is formed along the outer shape of 20f, it does not interfere with other parts after mounting. Moreover, the identification hole 33
Since 37 to 37 are provided in a line, they have excellent visibility,
The space of the protrusion 30a can be effectively utilized. As the identification mark provided on the protrusion 30a, a plurality of notches may be formed on the outer edge of the protrusion 30a instead of the identification holes 33 to 37, or a plurality of dots may be provided on the protrusion 30a by coating. It is also possible to use different colors.

[0020]

Since the present invention is configured as described above, it has the following effects. That is, in the laminated gasket of the present invention, a protrusion is formed along at least one substrate of the plurality of substrates along the outer shape of the cut-out portion of the corner, and the outer shape of the cut-out portion is formed on the protruding portion. Since the identification marks are provided in a row along the line, many identification marks can be provided in a limited space, and the visibility is excellent. Therefore, a desired laminated gasket can be easily selected, and even after being mounted on the engine, it can be easily viewed from the outside without impairing workability.

[Brief description of drawings]

FIG. 1 is a perspective view of one corner portion of a laminated gasket according to an embodiment of the present invention.

2 is a cross-sectional view of a caulking portion of a laminated gasket according to an embodiment of the present invention, which is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is an overall plan view of a laminated gasket according to an embodiment of the present invention.

4 is a cross-sectional view of a peripheral edge portion of a combustion chamber hole of a laminated gasket according to an embodiment of the present invention, which is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 Laminated Gasket 3 Cylinder Head 4 Cylinder Block 10 First Substrate, 20 Second Substrate 10f, 20f Excision Part 11,21 Combustion Chamber Hole, 12,22 Cooling Water Hole 13,23 Annular Bead, 24 Presser Bead 15,25 Blow-by hole, 16,26 Bolt hole 17,27 Annular bead, 18,28 Outer peripheral bead 19,29 Caulking hole 30 Intermediate plate 30a Projection part 31 Combustion chamber hole 32 Step part 33-37 Identification hole 40 Shim ring 50 Eyelet

Claims (1)

[Claims] 1. A laminated gasket formed by laminating a plurality of substrates, wherein each of the plurality of substrates is formed into a substantially rectangular shape having a cutout portion in which at least one corner portion is cut off,
Forming a protruding portion along the outer shape of the cutout portion on at least one of the plurality of substrates, and providing identification marks on the protruding portion in a line along the outer shape of the cutout portion. Characteristic laminated gasket.