JPH055332Y2 - - Google Patents

Description

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

(Prior Art) A cylinder head gasket is sandwiched between the upper surface of a cylinder block and the lower surface of a cylinder head of an automobile engine to maintain airtightness and liquidtightness between both surfaces.

Conventionally, such cylinder head gaskets were
A layer of gasket material is formed on both sides of a core material such as punched metal to form a gasket sheet, and various holes including bore holes, water and oil holes are bored in this gasket sheet, and the periphery of these holes is It was made by attaching grommets and eyelets to the part.

In contrast to cylinder head gaskets that use such gasket materials, in recent years metal cylinder head gaskets that are simply made of a plurality of laminated metal plates have been increasingly used.

This metal cylinder head gasket is the third
- As shown in Figure 4, bore holes 1, 1, water and oil holes 2, 2, and small circular holes 3, 3 for inserting bolts to connect the cylinder block and cylinder head are drilled in each. It is constructed by stacking a plurality of thin metal plates 4, 4 on top of one another and binding the plurality of thin metal plates 4, 4 together using grommets 5, 5 attached to the peripheral edges of the bore holes 1, 1.

Metal cylinder head gaskets like this,
Similar to cylinder head gaskets that use gasket materials that have been widely used in the past, they are sandwiched between the top surface of the cylinder block and the bottom surface of the cylinder head to maintain airtightness and liquidtightness between both surfaces.

Metal cylinder head gaskets have superior heat resistance compared to conventional cylinder head gaskets that use gasket materials, so they are installed in engines that reach high temperatures during operation, such as engines with superchargers and diesel engines. Even in such cases, sufficient airtightness and liquidtightness can be maintained for a long period of time.

(Problems to be Solved by the Invention) However, the metal cylinder head gasket constructed and used as described above has conventionally had the following disadvantages.

In other words, in order to maintain sufficient airtightness around the periphery of the bore hole and liquid-tightness around the periphery of the water and oil holes, the top surface of the cylinder block and the cylinder head must be adjusted by slightly changing the thickness of each part. When assembling between the cylinder and the bottom surface, it is necessary to make sure that the pressing force of each part is at an appropriate value, but with conventional metal cylinder head gaskets, it is necessary to make sure that the pressing force of each part is set to an appropriate value. 3 thin metal plates with slightly different thicknesses
Since it was constructed by laminating more than one layer, it was inevitable that the production cost would increase.

Metal cylinder head gaskets, which are made by simply laminating two metal sheets to reduce manufacturing costs, are also used in some cases, but they have problems with the sealing performance of each part and their aggressiveness against aluminum cylinder heads. (Easy to damage cylinder head surface)
In this respect, it was not necessarily satisfactory.

The metal cylinder head gasket of this invention is
This solves this inconvenience.

b. Structure of the invention (means for solving problems) The metal cylinder head gasket of the invention is:
It is made by laminating two metal plates, first and second, and has a bore hole that matches the cylinder hole of the engine, and water and oil holes that match the passage for lubricating oil or cooling water.

Furthermore, in the metal cylinder head gasket of the present invention, the portion around the bore hole of the first metal plate made of a relatively hard metal is folded back over the entire circumference. The water of the second metal plate, which forms a first folded portion having a thickness of two plates, and is made of a relatively soft metal;
The part that aligns with the oil hole is folded back so as to sandwich the periphery of the hole formed in the first metal plate, so that the thickness is the same as one sheet of the first metal plate and two sheets of the second metal plate. , forming a second folded portion.

The thickness of the first folded portion is greater than the thickness of the second folded portion, and the difference in thickness between the two folded portions is less than 0.05 mm.

(Function) The metal cylinder head gasket of the present invention constructed as described above is sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head in the same way as the conventional metal cylinder head gasket described above.
The first metal plate, which is relatively hard, is folded back around the periphery of the bore hole, which requires the highest level of airtightness, to maintain airtightness and liquidtightness between the two surfaces. Since one folded portion is provided, airtightness around the borehole can be maintained reliably.

Also, a second metal plate made of a relatively soft metal is folded around the periphery of the water and oil holes.
Because the second folded part is formed, this water,
The area around the oil hole is kept sufficiently liquid-tight, and the lower surface of the aluminum cylinder head that comes into contact with this second folded portion will not be damaged.

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

FIG. 1 shows a first embodiment of the metal cylinder head gasket of the present invention.

This metal cylinder head gasket is made by laminating two metal plates 6 and 7, a first and a second metal plate.
A bore hole 1 that aligns with the cylinder hole of the engine, a water and oil hole 2 that aligns with the lubricating oil or cooling water passage,
Although not shown in FIG. 1, it has a small circular hole 3 (see FIG. 3) through which a bolt for connecting the cylinder block and cylinder head is inserted.

Stainless steel plate (JIS No. SUS 304, etc.)
The area around the bore hole 1 of the first metal plate 6 made of a relatively hard metal such as A first folded portion 8 having a thickness T of two sheets is formed.

On the other hand, aluminum, aluminum alloy, copper,
A second metal plate 7 made of a relatively soft metal such as a copper alloy is superimposed on the upper surface of the first metal plate 6, and a part of the second metal plate 7 is
The part that aligns with the water and oil holes 2 is folded back 180 degrees so that the cross section becomes a horizontal U-shape to form a second folded part 9, and this second folded part 9 connects the first metal plate 6. The periphery of the formed hole 10 is sandwiched therebetween. Therefore, the thickness t of this second folded portion 9
is the sum of one first metal plate 6 and two second metal plates 7.

Thickness T, t of both first and second folded parts 8, 9
The thickness T of the first folded part 8 is larger than the thickness t of the second folded part 9, and the difference between the thicknesses T and t of both folded parts 8 and 9 is less than 0.05 mm. (0.05>T-tt≧0).

Thickness T, t of both first and second folded parts 8, 9
To be within the above range, for example, the first metal plate 6
The thickness of the second metal plate 7 is 0.2mm, and the thickness of the second metal plate 7 is 0.2mm.
Set to 0.09mm.

The metal cylinder head gasket of the present invention constructed as described above is made by folding a relatively hard first metal plate 6 around the periphery of the bore hole 1, which requires the highest level of airtightness. Since the first folded portion 8 is provided with a large thickness, when this metal cylinder head gasket is sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head, the contact pressure around the bore hole 1 is reduced. This increases the size of the bore hole 1, and ensures airtightness around the bore hole 1.

Further, the liquid-tightness around the water and oil holes 2 is sufficiently maintained by the second folded portion 9 formed by folding back the second metal plate 7 made of a relatively soft metal. Moreover, the second metal plate constituting the second folded portion 9 is relatively soft (Hv120 or less).
Since it is made of metal, the lower surface of the aluminum cylinder head, which the second folded portion 9 comes into contact with, will not be damaged.

Next, FIG. 2 shows a second embodiment of the present invention.

In the case of the first embodiment described above, the second metal plate 7 was overlapped on the upper surface side of the first metal plate 6 like the first folded part 8, but in the case of the second embodiment, the second metal plate 7 A second metal plate 7 is stacked on the lower surface of the first metal plate 6 in the opposite direction to the first folded part 8. However, the second metal plate 7 and the first folded part 8
A part of the second metal plate 7 so as not to overlap with each other.
A circular hole 11 having an inner diameter sufficiently larger than the outer diameter of the first folded portion 8 is formed in a portion aligned with the bore hole 1 .

In the case of this example as well, when used by being sandwiched between the top surface of the cylinder block and the bottom surface of the cylinder head, it is possible to maintain sufficient airtightness and liquid tightness between both surfaces, and the bottom surface of the cylinder head made of aluminum is not damaged. There's nothing wrong.

c. Effects of the invention The metal cylinder head gasket of the invention is
Since it is configured and operates as described above, it can be manufactured at low cost, and it not only maintains sufficient airtightness and liquid tightness between the top surface of the cylinder block and the bottom surface of the cylinder head, but also allows the cylinder head to be made of aluminum. Even when used, it has great practical effects, such as not damaging the surface of the cylinder head.

[Brief explanation of the drawing]

Figures 1 and 2 show the first and second embodiments of the metal cylinder head gasket of the present invention, respectively.
3 is a plan view showing an example of a conventional metal cylinder head gasket, and FIG. 4 is a sectional view taken along line BB in FIG. 3. 1...Bore hole, 2...Water, oil hole, 3...Small circular hole, 4...Thin metal plate, 5...Grommet, 6...
First metal plate, 7... Second metal plate, 8... First folded part, 9... Second folded part, 10...
...hole, 11... circular hole.

Claims (1)

[Scope of utility model registration request] A metal cylinder head gas made by laminating two metal plates, first and second, and having a bore hole that matches the cylinder hole of the engine, and water and oil holes that match the passages for lubricating oil or cooling water. In the butt, the portion around the bore hole of the first metal plate made of a relatively hard metal is folded back over the entire circumference,
A first folded portion having a thickness of two sheets of the first metal plate is formed, and a portion of the second metal plate made of a relatively soft metal that matches the water and oil holes, A second fold that is folded back to sandwich the peripheral edge of the hole formed in the first metal plate, and has a thickness equal to the sum of the thickness of one first metal plate and the thickness of two second metal plates. A metal cylinder head gas, characterized in that the thickness of the first folded part is larger than the thickness of the second folded part, and the difference in thickness between the two folded parts is less than 0.05 mm. Ass.