JPS58200858A - Single-plate metallic gasket - Google Patents

Abstract

PURPOSE:To improve the sealing performance with a simple and inexpensive cost by forming wide beads on a thin elastic metal substrate and applying plating onto the surface of the substrate to form rough surface and applying sealing members onto said rough surface, in the captioned apparatus for internal-combustion engine. CONSTITUTION:A thin metal plate having a small spring constant and made of elastic material is selected as the substrate 14 for a single-plate metallic gasket 12. A bead 18-1 is formed on the substrate 14 so as to surround a cylinder opening 16, and a bead 18-2 is formed so as to surround an outer peripheral edge 20. in this case, the bead width L is set sufficiently larger than the bead height H, and a spring constant is set small. Plated layers 24 are formed on both front and back surfaces of the substrate 14, and sealing members 26 are applied onto the rough surfaces of the plated layer 24. Thus, with a simple constitution, a high sealing performance can be maintained without giving injury due to the contact pressing onto the opposite surface, and certain close contact onto the substrate 14 of the sealing member 26 is permitted.

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a gold steel gas valve for internal combustion engines.
In particular, in order to reduce the spring constant, the thickness of the substrate is made thin, the bead width is formed to be sufficiently larger than the bead height, and the surface of the substrate is treated to improve the sealing performance of the bonding surface. The present invention relates to a single-plate metal gasket that can be used satisfactorily on a substrate, has an extremely simple structure, and is inexpensive.

A metal gasket is a metal gasket in which a convex, straight, or diagonal bead is formed on a thin elastic metal plate, and the bead effectively seals the joint surfaces of two parts of an internal combustion engine, such as a cylinder head and a cylinder glock.

It has been completed and filed by the inventor of this application. This metal gasket is constructed by laminating a substrate, which is an elastic metal plate, and sub-plates made of soft metal provided on both the front and back surfaces of this substrate.

It has already been announced that the gel fastening force of Cylinder Pro and the cylinder head forms a seal line on the joint surface, which is the deck surface, and makes a close contact, resulting in an outstanding sealing effect. However, since such a metal gasket is composed of the substrate and two sub-plates, it not only has a complicated structure, but also has the drawbacks of high material and manufacturing costs. Improvement was desired.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate the above-mentioned drawbacks.

To realize a single-plate metal gasket which has a simple structure and can achieve good sealing performance.

In order to achieve this object, the present invention makes the thickness of the substrate thin and forms the bead width wide.

Embodiments of the present invention will be described in detail and specifically with reference to the drawings, which are characterized in that the surface of this substrate is plated to make it a rough surface, and a sealing material is applied on the rough plated surface. 1 to 5 show an embodiment of the present invention. In FIG. 4, 2 is a cylinder head, 4 is a cylinder pro,
6 is a furnace chamber, and 8 is a piston. The cylinder head 2 and the cylinder dog port 4 are connected to a joint surface 1, which is the so-called R2 surface.
0 ft, and a gasket is provided on this joint surface 10 to provide a seal at this joint surface 10. In this invention, the single plate metal is used as the socket 12.
to intervene.

When forming the single-plate metal gasket 12, first, a thin metal plate made of an elastic material and having a small spring constant is selected as the substrate 14 of the single-plate metal gasket 12. In other words, a spring constant of small 9, for example, thin 1, is used so as to exhibit a good sealing effect against the other side surface to be joined to the substrate 14, but at the same time avoid forming a recess on the side of the cylinder head made of aluminum material. . In addition, when the mating material is aluminum, the bead surface pressure applied to the mating surface during tight contact is 400 kl? /cm2 or less In this example, in order to reduce the spring constant, thin stainless steel spring steel was selected, and the plate thickness was 0.10-0.25 m.
range. In addition, the hardness of this spring steel is HV300
-45Q range. And as shown in FIG.

A bead 1 is attached to the substrate 14 in a manner surrounding the cylinder hole 16.
8-1. The bead 18-2 goes around the outer circumferential edge 2o.
form. When forming the beads 18-1 and 18-2, the bead width is made sufficiently larger than the bead height H in order to further reduce the spring constant, as shown in FIG. That is, the bead width is the distance between the bead ends 22-1 and 22-2.

A convex bead having a cross-sectional shape protruding toward the side of the cylinder 2 is formed to have a height greater than H, thereby reducing the spring constant. Next, the substrate 1 on which the beads 18-1, 18-2 are formed
40 The plated layer 24 has a rough surface, and the plated layer 24 has a rough surface, and a coating material having heat resistance of 300°C or more and flexibility is applied to the rough surface of the plated layer 24. A sealing material 26 is applied. In this example, the plating thickness was 7 microns or less, and the sealing material thickness was 50 microns or less.

By applying this sealing material 26, irregularities such as tool marks and scratches on the joint surface 10 are compensated for and absorbed.

Can be micro-sealed. In addition, this sealing material 26 ensures good sliding between the joint surface 10 and the metal gasket 2 in the lateral direction of the bead 18-1 (that is, the joint surface 1
No distortion occurs (in the direction parallel to 0), and an ideal sealing effect can be achieved. In addition.

28 is the top, and 30 is the bolt hole.

In addition, on the flange made of cast iron sleeve,
Since there is no problem even if the surface pressure of the bead portion is set to 5001i/- or more, that is, no recess is formed, the bead shape is the end portion 22-1 as shown in FIG.

22-2 part with this cast iron three! Side 8. In other words, it is formed so that it is on the cylinder lock side.

This invention is configured as described above.

It works as follows. As shown in FIG. 5, a single metal plate inserted into the cylinder at the joint surface 10 between the door 2 and the cylinder dog opening 4 is pressed by the single metal plate 12 due to the fastening force of the bolt. The top part 28 of the bead becomes a gently curved surface.

Due to this pressing force, surface pressure due to the seal line acts on the cylinder head 2 side. At the same time, due to this pressing force, the cylinder pro,
Surface pressure due to the seal line acts on the 4 side. Furthermore, since the plating layer 24t is applied to both the front and back surfaces of the substrate 14, the sealing material 26 adheres well, and the plating layer 24 and the sealing material 26. In particular, the sealing material 26 is susceptible to thermal distortion on this joint surface 10.

Reliably compensates for irregular surfaces such as tool marks and scratches.

Demonstrates effective sealing properties. Furthermore, this sealing material 26 prevents the hard base plate 14 portion from coming into contact with the deck surface of the cylinder head 2 made of aluminum or the like, which is the mating surface.
This can prevent damage to the two sides of the board. The sealing material 26 also has the function of allowing slippage on the joint surface 10 and improving conformability. The same thing can be said about the deck surface of the cylinder block 4.

It should be noted that this invention is not limited to the above embodiments.
Of course, various applications and modifications are possible. In the above embodiment, both sides of the board were plated to make the surfaces rough, and the sealing material was applied on the rough plated surfaces. However, the present invention is applied only to one side of the board, which is more necessary, such as the upper surface of the cylinder head. It can also be applied and a good sealing effect can be obtained.

As is clear from the above description, the present invention provides the following effects.

(1) A configuration in which the substrate thickness is reduced and the bead width is formed wide to reduce the spring constant, a sealing material is applied on this substrate, and this substrate is brought into contact with the bonding surface via the sealing material. So, what about this gasket? When suppressed by the tightening force of the bolt, the surface pressure due to the seal wire is 400 kg.
/i or less.

There is no inconvenience of damaging the mating surface due to pressure contact, and high sealing performance can be maintained.

(2) This mirror-like substrate surface was first plated to make it a rough surface, and the sealing material was applied on this rough plated surface, so the sealing material had strong adhesion to the substrate. There is no problem of the sealing material peeling off from the substrate.Furthermore, this sealing material can compensate for irregular surfaces such as thermal distortion, tool marks, and scratches on the bonding surface by micro-sealing.Furthermore, it allows bead sliding and has a good seal. To obtain the effect of ensuring sealing performance and exhibiting high sealing performance.

(3) Since the gasket of the present invention is constructed as described above, the construction is simple and the material and manufacturing costs are low.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is a plan view of a single-plate metal gasket according to the embodiment of the invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 3 is an enlarged sectional view of a portion taken in the direction of arrow {circle around (2)} in FIG. 2, FIG. 4 is a sectional side view of a main part, and FIG. 5 is a partially enlarged side view of a single-plate metal gasket. In the figure, 2 is the cylinder head, 4 is the cylinder mouth, 6 is the combustion chamber, 8 is the pi, X) y, 10 is the joint surface,
12 is a single plate metal gasket), 14 is a substrate, 16 is a cylinder hole, and 18-1, 18-2 is a bead. 20 is the outer peripheral edge, 22-1, 22-2 is the end, 24 is the plating, 26 is the sealing material, 28 is the top, and 30 digits? It is a root hole. Agent Patent Attorney Yoshimi Saigo 37

Claims (1)

[Scope of Claims] In a metal socket for preventing gas leakage by forming beads on a metal elastic substrate, the thickness of the metal elastic substrate is made thin, the width of the beads is formed wide, and the surface of this substrate is made thin. Plated to give a rough surface. This veneer metal gasket is characterized by having a sealing material adhered to the rough plated surface.