JP3084499B2 - Manufacturing method of manifold gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a manifold gasket for sealing a cylinder block between an intake port and an intake manifold and between an exhaust port and an exhaust manifold.

[0002]

2. Description of the Related Art Engines mounted on vehicles such as automobiles are developed in a variety of products in accordance with the tastes of consumers and are developed in a variety of products so as to be able to respond to the required displacement and output in detail. ing. In that case, the bore of the cylinder,
By unifying strokes and bore pitches and changing the number of cylinders, a series of engines with various displacements is being developed as a series.

[0003] Manifold gaskets conventionally used for sealing between the intake and exhaust ports of such a series engine and the flange of the intake and exhaust manifold are usually manufactured by punching with a press die. In the case where the series engine has two types of product configurations of three cylinders and four cylinders, an integral structure in which a seal portion for sealing between each port and a flange of the manifold is connected by a band-like connecting portion. , Or a manifold gasket formed independently for each port is used for the number of cylinders.

[0004]

However, when manufacturing a dedicated manifold gasket corresponding to each displacement, a dedicated press die is manufactured for each, and the material plate of the manifold gasket is formed by the press die. Need to be punched out. In other words, in this method, it is necessary to produce several types of manifold gasket press dies in accordance with the type of engine to be produced. There is a problem that a storage space for the press mold must be secured.

On the other hand, when manifold gaskets formed independently for each port are used by the number of cylinders, first, studs for temporarily fixing the manifold gaskets are embedded in the cylinder head, and the manifold gaskets are inserted into the studs. And the manifold must be assembled while preventing falling off, and there is a problem that workability is extremely poor.

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to manufacture a manifold gasket to be used for a series engine configured as a product line having a different number of cylinders by using a common press die. It is an object of the present invention to provide a method of manufacturing a manifold gasket which is excellent in assembling workability by forming a seal portion for sealing between the flanges of the above-mentioned flanges as an integral type mutually connected by a connecting portion. .

[0007]

Means for Solving the Problems] manifold gasket manufacturing method of the present invention for achieving the above object, et Nji
An inner diameter and arrangement interval of the cylinders constituting the down common, in the manufacturing method of the manifold gasket for cylinder number is different <br/> series engines, the manifold gasket, intake
Multiple pieces formed according to the sealing part of the exhaust port
Between the two seal portion adjacent to the seal portion, a connecting portion
Linked together comprise a unitary structure, before the press mold
Also the largest cylinder in the serial series engine Ru can press processing
The manifold gasket for the most cylinder engine
When you press the Tsu door is, all of the press type of press section
Using a material plate with a width that covers the width ,
Manufacture manifold gaskets by punching
And, a manifold gas for less than most multi-cylinder engine
When you press the packet is, to cover the seal portion of the required number of
Use material plate to that width, one also less of the material plate
Press mold so that one end is located at the site of the connection part
It is supplied to, by punching in the pre-scan type, Maniho
A method characterized by preparing the over field gasket.

The method for manufacturing a manifold gasket according to the present invention can be applied to both a case of manufacturing an intake manifold gasket and a case of manufacturing an exhaust manifold gasket. It can be applied as appropriate when manufacturing using such a material. In the case where a manifold gasket other than the one for the most cylinders is manufactured using a part of the press die, one end has a shape interrupted at the connection part, and an edge is formed at this part. Therefore, it is more preferable to use a press die in which such an edge is not formed beforehand.

[0009]

[Operation] According to the present invention, of the engine product line,
According to the engine with the largest number of cylinders, by manufacturing only the manifold gasket press die for the most cylinders, and by changing the width of the material plate punched by this press die (the length corresponding to the longitudinal direction of the cylinder head), Manifold gaskets suitable for various types of engines can be manufactured.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. In Example 1 shown in FIG.
Is used to produce two types of manifold gaskets for three cylinders and four cylinders. As described above, the press mold 1 corresponding to the four-cylinder engine, which is the most cylinder in the series, is used in accordance with the two types of product variations in which the bore and the bore pitch of the cylinder are common. As a material to be punched out, a material plate 2 for four cylinders and a material plate 3 for three cylinders are prepared.

First, when manufacturing a manifold gasket for four cylinders, a material plate 2 for four cylinders is put into a press die 1 and punched out to form a manifold gasket 4 as shown in FIG. . This manifold gasket 4 is formed with four seal portions 5a to 5d corresponding to each port of the cylinder head of a four-cylinder engine.
These seal portions 5a to 5d are connected to each other by connecting portions 6a to 6c to form an integrated structure.

The seal portions 5a to 5d of the manifold gasket 4 have ventilation holes 7 through which intake air or exhaust air passes.
When the manifold gasket 4 is sandwiched and fixed between the cylinder head and the manifold, a bolt hole 8 through which a fastener such as a bolt penetrates is formed.
On the other hand, according to the present embodiment, the same press die 1 used when the manifold gasket 4 for four cylinders is manufactured is used, and the material plate 3 for three cylinders is put into the press die 1 and punched out. Thereby, the manifold gasket 9 for three cylinders as shown in FIG. 3 can be formed.

When the three-cylinder manifold gasket 9 is manufactured, the manifold gasket 9 for the four cylinders is cut off at the connecting part 6c connecting the seal part 5c and the seal part 5d. An edge is formed on the connecting portion 6c. To prevent this, in the second embodiment shown in FIGS. 4 to 7, a smooth surface 9a can be formed on the connecting portion 6c. So, press mold 1
In the portion where the connecting portion 6c of the manifold gasket 9 is punched, a chamfered portion 1a is provided.

Then, by punching out the material plate 2 using the press die 1 shown in FIG. 4, as shown in FIG.
The manifold gasket 4 for four cylinders has a connecting portion 6a
Notches 4a will be formed at ~ 6c. On the other hand, as shown in FIGS. 6 and 7, the connecting portions 6a and 6b of the manifold gasket 9 for three cylinders have the same cutouts 9b as described above.
Is formed, and the connecting portion 6c has a smooth surface 9a on its end 9c.
Is formed. By forming in this way, it is possible to prevent injuries such as cutting off the hand by the edge when attaching the manifold gasket 9.

In this embodiment, such a smooth surface 9a is formed in order to ensure safety during the mounting operation. However, in order to secure the shape, a notch is formed. The position of a positioning sensor or the like is set so that the end 9c of the material plate 3 for three cylinders coincides with the C line in FIG. 4 showing the position of the top of the chamfered portion 1a of the press die 1 for punching 4a, 9b. The position of the end 9c is measured by using the detecting means, and the alignment control is performed.

By controlling as described above, the position of the end 9c of the manifold gasket 9 other than the one for the most cylinders is made to coincide with the position of the chamfered portion 1a of the press die 1 shown in FIG. The shape of the end 9c is prevented from becoming the shape shown in (b) and (d), and the end 9c can be made smooth as shown in (c).
Note that, as the shape of the chamfered portion 1a of the press die 1, various shapes can be applied in addition to the shape forming the cutouts 4a and 9b as described above. a)
By forming the chamfered portion 1a as shown in FIG. 1 on the press die 1, a projection 9d as shown in FIG.

[0017]

Method for manufacturing a manifold gasket according to the present invention has an inner diameter and arrangement interval of the air cylinder constituting the engine
But a common, in the manufacturing method of the manifold gasket for cylinder number is different series engine, the Manihoru
Align the gasket with the sealing part of the intake and exhaust ports.
Seals and two adjacent seals
The parts between the parts are constructed as an integral structure connected by connecting parts.
To, most cylinder in the series engine as a press die
Prepare what you can press working, for the most multi-cylinder engine
When pressing the manifold gasket,
Use the material plate of width to cover the full width of the press section of the scan type
To, by Nuku striking Chi at the press type, Maniho
To produce a field gasket, less engine than most cylinder
When pressing the manifold gasket for
A sealing portion by using a material plate having a width of cover of the
At least one end of the material plate is located at the connection portion.
Is supplied to the press die so that
By and wolfberry, possible to manufacture the manifold gasket
Since in a manner characterized, it can provide the following effects.

Since the manifold gasket used for the engine group constituted as a product line having a different number of cylinders and corresponding to each number of cylinders can be manufactured by a common press die, the trouble of replacing the press die can be eliminated.
In addition, it is not necessary to manufacture a dedicated press die for each type, so that the cost and days for manufacturing the press die can be saved, and the press die can be stored in a small space.

In addition, while being applicable to engines having different numbers of cylinders, a manifold gasket having an integral structure in which seal portions for sealing between each intake / exhaust port of a cylinder head and a flange of a manifold are mutually connected by a connecting portion. Therefore, a manifold gasket excellent in assembling workability can be manufactured. In addition, connection of a press-type manifold gasket
The chamfered portion is provided in part, for the most cylinder in Series engine
At the time of the manifold gasket production other than, to the pre-scan type
Position the end of the material plate to be charged at the top of the chamfer
In registration, by punching the wood material plate, Manihoru
Be the shape of the end of the de gasket smooth shape
Can be cut by the edge of this end during installation.
Injuries Do not Let 's that can be prevented in advance.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a method of manufacturing a manifold gasket according to a first embodiment of the present invention, showing a common press die, a material plate for four cylinders, and a material plate for three cylinders.

FIG. 2 is a plan view of a manifold gasket for four cylinders formed by the method of FIG.

FIG. 3 is a plan view of a manifold gasket for three cylinders formed by the method of FIG. 1;

FIG. 4 is a schematic view showing a method of manufacturing a manifold gasket according to a second embodiment of the present invention, showing a common press die, a material plate for four cylinders, and a material plate for three cylinders.

FIG. 5 is a plan view of a manifold gasket for four cylinders formed by the method of FIG. 4;

FIG. 6 is a plan view of a manifold gasket for three cylinders formed by the method of FIG. 4;

FIG. 7 is an enlarged view of a portion A in FIG. 6;

FIG. 8 is a plan view showing a state of position control when manufacturing a manifold gasket other than the one for the most cylinders in the method for manufacturing a manifold gasket of the present invention.

FIG. 9 is a plan view exemplifying an end shape in the case of manufacturing a manifold gasket other than for the most cylinders in the method for manufacturing a manifold gasket of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press die 1a Square part 2 Material plate 3 Material plate 4 Manifold gasket 5a Seal part 5b Seal part 5c Seal part 5d Seal part 6a Connection part 6b Connection part 6c Connection part 9 Manifold gasket 9a Smooth surface 9c End

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-88077 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 15/00-15/34 B21D 28 / 00-28/36

Claims (2)

(57) [Claims] An internal diameter of a cylinder constituting an engine and an arrangement between the cylinders
In a method of manufacturing a manifold gasket for a series engine having a common separation and a different number of cylinders , the manifold gasket is sealed with an intake / exhaust port.
Adjacent to a plurality of seals formed according to the
That two between the seal portion, an integral structure which is connected by a connecting portion
And press the most cylinders in the series engine as a press type.
Prepare manifolds that can be machined and press the manifold gasket for the most cylinder engine
When the to cover the entire width of the press section of the pre-scan type
Use material plate of that width, this punching Te in the press mold
To manufacture a manifold gasket, and use fewer manifold gaskets for engines than the largest number of cylinders.
When pressing the seal, make sure that the width covers the required number of seals.
In the using materials plate, of the material plate least one of
Hold the press mold so that the end is located at the joint.
Supply and punching with the press die, the manifold
A method for manufacturing a manifold gasket, comprising manufacturing a gasket. 2. A manifold for an engine having less than the largest number of cylinders.
When pressing the hold gasket , press
Link that connects between the seal part and the adjacent seal part.
In the middle part of the joint, round the end of this joint
For the most in the series engine
Manifold gasket production of a smaller number of cylinders than for cylinder
During the end of the material plate to be put into the press die
The method for manufacturing a manifold gasket according to claim 1 , wherein the material plate is punched out while being aligned with the top of the chamfer.