JPH055333Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The metal cylinder head gasket according to this invention is sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head of an automobile engine, and is used to maintain airtightness and liquidtightness between both surfaces. Used to hold.

(Prior Art) A cylinder head gasket is sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head of an engine to prevent high-pressure combustion gas generated within the cylinder formed in the cylinder block, and to prevent the high-pressure combustion gas from flowing between the cylinder block and the cylinder head. This prevents the cooling water or lubricating oil flowing between the two from leaking to the outside.

Conventionally, such cylinder head gaskets have been widely used, with layers of gasket material such as asbestos or carbon formed on both the front and back sides of a core material such as a steel plate with a hook. Due to increased output, cylinder head gaskets are now required to have a high degree of heat resistance, and metal cylinder head gaskets made of metal plates are increasingly being used.

This metal cylinder head gasket is constructed as shown in FIG. 4, for example.

That is, this metal cylinder head gasket 1
The cylinder block is made up of one or a plurality of laminated metal plates 2, and a plurality of bore holes 3, 3 are formed in the metal plate 2, which are aligned with the cylinder holes opened on the top surface of the cylinder block.
And the water that also opened on the top surface of the cylinder block,
Through holes 4, 4 that align with the oil holes, and small circular holes 5, 5 for inserting bolts that connect the cylinder block and cylinder head are formed.

Around each bore hole 3, 3, if necessary, a grommet made of a thin metal plate is attached, one of the thin metal plates is folded back 180 degrees, or a protrusion having various cross-sectional shapes is formed. As a result, the pressing force around the bore holes 3, 3 is increased to prevent high pressure combustion gas generated within the cylinder hole during engine operation from leaking to the outside.

However, in the case of the conventional metal cylinder head gasket 1 constructed and operated as described above, the following disadvantages occur.

That is, the force that presses the metal cylinder head gasket 1 between the upper surface of the cylinder block and the lower surface of the cylinder head is obtained by the tightening force of the bolts used to connect the cylinder block and cylinder head to each other. This tightening force inevitably decreases in the narrow portions 6, 6 that exist between the adjacent bore holes 3, 3, where the distance from the bolt inserted into the small circular holes 5, 5 increases. .

For this reason, the airtightness around the bore holes 3, 3 tends to be incomplete at the narrow portions 6, 6, and if it becomes incomplete, high-pressure combustion gas leaks between adjacent cylinder holes. (so-called blow-through), the performance of the engine deteriorates.

In order to prevent the occurrence of such blow-through, as shown in Figs. 5 and 6, adjacent bore holes 3,
Thin shim plates 7, 7 of approximately 20 to 70 μm are laminated on the narrow width portions 6, 6 existing between the narrow width portions 6, 3.
Make sure that the pressing force at step 6 is sufficiently large,
Efforts are being made to prevent high pressure combustion gas from leaking between adjacent bore holes 3,3.

(Problem to be solved by the invention) However, in the case of the conventional metal cylinder head gasket, adhesives are used to stack and fix the shim plates 7, 7 on the respective narrow width parts 6, 6. Alternatively, spot welding was used, which not only made the assembly work troublesome, but also made the shim plates 7, 7 easy to come off.

Even if the shim plates 7, 7 come off, or even if the shim plates 7, 7 are missing from the beginning, the absence of the shim plates 7, 7 cannot be identified from the outside, and the shim plates 7, 7 are missing. It was easy to assemble the metal cylinder head gasket without 7 and 7 into the engine as is.

The metal cylinder head gasket of this invention is
This solves the above-mentioned inconveniences.

(Means for solving the problem) The metal cylinder head gasket of the present invention is
Similar to the conventional metal cylinder head gasket described above, it is constructed by laminating at least two metal plates, a first and a second metal plate, with at least two metal plates aligned with the cylinder hole opened on the top surface of the cylinder block. The metal plate has more than one bore hole, and a shim plate is sandwiched between the first and second metal plates in a narrow portion located between adjacent bore holes, so that the metal plate is laminated.

Furthermore, in the metal cylinder head gasket of the present invention, first through holes are formed at both ends of the narrow portion of the first metal plate, and second through holes are formed at both ends of the narrow portion of the second metal plate. A locking piece that can freely enter the first through hole is formed at both ends of the shim plate, and the locking piece inserted into the first through hole is inserted into the edge of the first through hole. The shim plate is joined to the first metal plate by bending it towards the thickness of the metal cylinder head gasket. They are aligned in the horizontal direction.

(Function) In the case of the metal cylinder head gasket of the present invention constructed as described above, the shim plate is attached to the first metal plate by the locking pieces at both ends, so the attachment work is only facilitated. The presence or absence of the shim plate can be determined by the presence or absence of the bent portion of the locking piece.

In addition, since the second through hole formed in the second metal plate is aligned with the bent part of the locking piece, the plate thickness of the metal cylinder head gasket is partially reduced due to the presence of this bent part. Prevents it from getting bigger.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

1 to 3 show an embodiment of the present invention, FIG. 1 is an exploded perspective view showing the main parts, FIG. 2 is a plan view showing the assembled state, and FIG. 3 is an A-- It is an A sectional view.

A plurality of bore holes 3, 3 are formed in the first and second two metal plates 8, 9, which constitute the metal cylinder head gasket 1, respectively, and between the adjacent bore holes 3, 3, a plurality of bore holes 3, 3 are formed. are defined as narrow width portions 6a and 6b.

The first metal plate 8 of the narrow width portions 6a and 6b
Rectangular first through holes 1 are provided at both ends of the narrow portion 6a.
0 and 10, and circular second through holes 11 and 11 are formed at both ends of the narrow portion 6b of the second metal plate 9, respectively. However, the shapes of both the through holes 10 and 11 are not particularly limited to those shown in the drawings.

In addition, the shim plate 12 has a shape and size that does not protrude from the side edges of each narrow width portion 6a, 6b.
The first through holes 10, 10 are provided at both ends in the length direction.
Locking pieces 13, 13 that can freely enter are formed.
The middle part of each locking piece 13, 13, which is formed to be narrower (although not necessarily narrower) than the main body part of the shim plate 12, is bent at a right angle toward the first metal plate 8. Then, hold the tip of the locking portion 14,1
It is set at 4.

When attaching the shim plate 12 to the first metal plate 8, each locking part 14, 14 is inserted into the first through hole 10, 10 formed in the narrow part 6a of the first metal plate 8. , and further locking portions 14, 14 of each locking piece 13, 13.
are bent toward the edges of the first through holes 10, 10, and toward the center of the narrow portion 6a, respectively.

As a result, the shim plate 12 and the first metal plate 8 are
The locking pieces 13, 13 provided at both ends of the shim plate 12 unfavorably connect them to each other. Therefore, the first metal plate 8 and the second metal plate 9 are overlapped with the shim plate 12 in between to complete a metal cylinder head gasket.

In this way, when both the first and second metal plates 8, 9 are stacked on top of each other, the second through holes 11, 11 formed in the narrow portion 6b of the second metal plate 9, The bent portions 15, 15, which are formed by bending the locking portions 14, 14 of the locking pieces 13, 13 to the edges of the first through holes 10, 10, are in the thickness direction of the metal cylinder head gasket 1. (in the left-right direction in FIG. 3). Note that alignment in this specification means that each bent portion 15, 15 is aligned with the second through hole 11,
11, and does not necessarily mean that the center of each bent portion 15, 15 and the second through hole 11, 1
It is not necessary that the center of 1 coincides with the center of 1.

In the case of the metal cylinder head gasket of the present invention constructed as described above, the shim plate 12 is attached to the first metal plate 8 by the locking pieces 13, 13 at both ends, but this attachment work is The press work performed when assembling the cylinder head gasket can be performed at the same time as the assembly work, making the installation work easier.

Moreover, the bent portions 15, 1 of each locking piece 13, 13
5 is visible from the outside even after the metal cylinder head gasket is completed, so the presence or absence of the shim plate 12 can be determined by the presence or absence of the bent portions 15, 15. There is less risk of assembling the butt as is into the engine.

Furthermore, a second through hole 1 formed in the second metal plate 9
1 and 11 are aligned with the bent portions 15 and 15 of the locking pieces 13 and 13, so when the metal cylinder head gasket is strongly clamped between the upper surface of the cylinder block and the lower surface of the cylinder head, each bent portion The portions 15, 15 sink toward the second through holes 11, 11, and the bent portions 15, 15,
Strong tension between the two surfaces is prevented. Therefore, due to the presence of the bent portions 15, 15, airtightness in the narrow portion of the metal cylinder head gasket will not become uncertain.

(Effects of the invention) The metal cylinder head gasket of the invention is
Since it is configured and operates as described above, it is not only possible to efficiently manufacture metal cylinder head gaskets with shim plates, but also to reliably prevent the shim plates from falling off, and to produce gaskets without shim plates. Since this can be determined visually, it is possible to reliably prevent a gasket without a shim plate from being assembled into the engine as is.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being an exploded perspective view showing the main parts, Figure 2 being a plan view showing the assembled state, and Figure 3 being A--A in Figure 2. A sectional view, FIG. 4 is a plan view showing an example of a metal cylinder head gasket without a shim plate, FIG. 5 is a plan view showing an example of a metal cylinder head gasket provided with a shim plate, and FIG. The figure is enlarged B- of Figure 5.
It is a sectional view of B. 1...Metal cylinder head gasket, 2...
...Metal plate, 3...Bore hole, 4...Through hole, 5...Small circular hole, 6, 6a, 6b...Narrow width part, 7...Shim plate, 8...First metal plate, 9 , second metal plate, 1
0...First through hole, 11...Second through hole, 12...
...Shim plate, 13...Latching piece, 14...Locking part, 1
5...Bending part.

Claims (1)

[Scope of utility model registration request] It is constructed by laminating at least two metal plates, a first and a second metal plate, and has at least two or more bore holes that align with the cylinder hole opened on the top surface of the cylinder block, and has a space between adjacent bore holes. Place the shim plate in the narrow part located in the first part above.
In a metal cylinder head gasket that is laminated by being sandwiched between second metal plates, a first through hole is formed at both ends of the narrow part of the first metal plate, and a first through hole is formed at both ends of the narrow part of the first metal plate, A second through hole is formed at both ends of the narrow portion, and a locking piece that can freely enter the first through hole is formed at both ends of the shim plate, and the locking piece is inserted into the first through hole. By bending the shim plate toward the edge of the first through hole, the shim plate is joined to the first metal plate, and the second through hole formed in the second metal plate and the bent part of the locking piece are connected. A metal cylinder head gasket, characterized in that the metal cylinder head gasket is aligned throughout its thickness.