JPS6188077A - Manufacture of exhaust manifold gasket - Google Patents

Abstract

PURPOSE:To increase positioning efficiency and accuracy, by a method wherein, after 2 gasket base materials and one iron sheet are formed in a threehold structure, and, except the one gasket, the gasket base material and the iron sheet are separated and cut at each cylinder. CONSTITUTION:To the one gasket base material 1 continuously formed between cylinders, the other gasket base material 3 and an iron sheet 2 are coupled at each cylinder. After the gasket base materials 1 and 3 are adhered in 3 layers with the iron sheet 2 located therebetween, arm parts 11 and 10 of the other gasket base material 3 and the iron sheet 2 are cut and separated, and the gasket base materials 1 and 3 and the iron sheet 2 are located independently at each cylinder. This constitution enables correct positioning of the gaskets at all cylinders just through positioning of the iron sheet 2 and the gasket base materials 1 and 3 during contact bonding, and saves a machining labor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a method of manufacturing a gasket interposed between +I+ of an exhaust manifold and a shilling head of an internal combustion engine.

(Prior art) In order to prevent gas leakage at the joint between the exhaust manifold and the shilling head, it is known and has been practiced to insert a gasket between the joints of the exhaust manifold and the shilling head (see Utility Model No. 5).
No. 8-48957, etc.).

By the way, the J Schilling head is kept at a relatively low temperature by the cooling effect of engine cooling water, but the exhaust manifold is not water cooled in this way, so it becomes much hotter when the engine is under high load. For this reason, in a multi-air AM flight, there is a large difference in thermal expansion between the shilling head and the exhaust manifold in the direction of the engine. However, when such a difference in thermal expansion occurs, large thermal stress occurs in the exhaust manifold and silling head, and in severe cases, the exhaust manifold and bolts may be damaged by the excessive stress.

To absorb such thermal stress, it is possible to create slippage between the exhaust manifold and the shilling head due to thermal expansion or contraction, but with a normal gasket, it is difficult to tighten the bolts. Make sure the 7-run corner of the exhaust manifold doesn't dig into it.

Therefore, the exhaust manifold V is less likely to slip against the shilling head due to thermal deformation.

Therefore, the applicant proposed a gasket having a three-layer structure as shown in FIGS. 5 to 7.

The first part to be joined to the shilling head side is the skenod base material 1.
The iron plate 2 is held between the gasket base member 3 and the second gasket base material 3 joined to the exhaust manifold side. The gasket base material 3 and the iron plate 2 are separated into 3a, 3b, 2a, and 2b for each branch of the exhaust manifold, so that the gasket base materials 1 and 3 slide relative to each other with both sides of the iron plate 2 as boundaries. It is more likely to occur.

In this case, the reason why the gasket base material 1 on the cylinder head side is made continuous without being separated between sections is to improve the ease of attaching the gasket.If it were separated for each cylinder, it would be extremely troublesome to install it. Put it away.

However, the other gasket base material 3 and the iron plate 2 need to be separated as described above in order to easily cause slippage.

(Problem to be solved by the invention) However, for this reason, at the stage of manufacturing the gasket, the skeleton base material 3 and the iron plate 2 are separated for each cylinder.
The process of integrally joining the cylinder head side to the skeleton base material 1 is complicated and time-consuming.

In other words, in order to connect these, the steel plate 2 and the separated base material 3 are crimped to the base metal 1 with the bolt holes 4 and exhaust passage holes 5 aligned. The connecting claws 6 which alternately protrude toward both sides of the iron plate 2 are made to bite into the gasket base materials 1 and 3.

However, the connecting claws 6 are minute protrusions and do not prevent relative movement between the gasket base materials 1.3 with the iron plate 2 as a boundary. It is a core metal.

In this way, each cylinder is separated, but the skeleton base material 3 and the iron plate 2 are aligned and crimped one after another, but this process is very time-consuming and the positioning The alignment accuracy tends to be low, resulting in extremely low production efficiency, and the present invention aims to solve these problems.

(Method for Solving the Problems) Therefore, the present invention has developed an exhaust manifold having a three-IrA structure in which a steel plate is sandwiched between two gasket base materials, and that the scale γF is reduced! !
In this method, one gasket base material is formed continuously between each cylinder, and the other gasket base material and the steel plate are connected via arms for each cylinder, and these are connected with the steel plate in between. After bonding in three layers, the base gasket base material and the arm portions of the iron plate are cut and separated, and the base gasket base material and the steel plate are made independent for each cylinder.

Therefore, by simply aligning the iron plate and the two gasket base materials during crimping, gaskets for all cylinders can be correctly positioned, saving processing time and greatly improving accuracy.

(Example) f:tSIIA - A detailed explanation of the present invention shown in FIG. 4 will be given.

Although it is joined to the shilling head side, the Sukenodo base material 1 has gold cylinders that are continuous with the same width, whereas the iron plate 2 and the other Sukenodo base material 3 have narrow spaces between each cylinder. @
They are connected by sections 10 and 11, respectively.

The outer shape of the iron plate 2 is slightly smaller than that of the gasket base material 1.3, and on the other hand, the passage hole 5 of the iron plate 2 is set to be thicker.

This is also shown in Fig. 4, but when the gasket is inserted into the throat 12 of the cylinder and the exhaust manifold 13 is tightened with bolts, the skeleton base material 3 deforms and becomes slippery. .

The iron plate 2 is aligned and placed on the upper surface of the gasket base material 1. At this time, glue is applied to both sides of the iron plate 2 in advance. Align and place it on top of 2.

These are aligned so that the bolt holes 4 and 41i and the electrical passage hole 5 are properly aligned), and then by compressing them, the three are bonded together.

Figure 2 shows the state in which the iron plate 2 is glued to the gasket base material 1, but as shown in Figure 3, after gluing the king, the arms 10 and 11 of the iron plate 2 and the gasket base material 3 are cut from the base. Separate, preferably severed arms 10.11
The cut portion 15 is formed so that the root of the cut portion 15 bites into an arc shape. This is to facilitate deformation when the gasket is tightened, as mentioned above.

In this way, the iron plate 2 and the gasket base material 3, which are connected by the arms 10 and 11 over the metal cylinder, are glued together and then the unnecessary parts are cut off. Compared to gluing, it is much easier to achieve accurate alignment as a whole.

Note that since the iron plate 2 and the gasket base material 3 are separated from each other after being cut, after the exhaust manifold is attached to the shilling head, thermal deformation of the exhaust manifold will not be hindered.
Sliding between gasket base materials 1 and 3 is guaranteed with an iron plate 2 as a boundary.

(Effects of the Invention) As described above, according to the present invention, after two gasket/base materials and one steel plate are combined into a three-layer structure, one Since the gasket base material and steel plate are cut separately for each cylinder, alignment of the gasket base material and steel plate can be performed simultaneously for all 'A' cylinders, improving the efficiency and accuracy of alignment. On the other hand, the number of man-hours required for bonding and punching can be significantly reduced, and the shape of the gasket base material can be freely selected, resulting in a significant improvement in production efficiency.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, an exploded perspective view of the gasket, Figs. 2 and 3 are plan explanatory views showing the front and back of the arm section, and Fig. 4 shows the installed state of the gasket. FIG. tjSS is an exploded perspective view showing the example of the prior application, FIG. 6 is a sectional view thereof, and FIG. 1'17 is an explanatory plan view. 1.3... Gasket base material, 2... Steel plate, 4...
Bolt hole, 5... Exhaust passage hole, 10.11... Arm portion, 12... Schilling head, 13... Exhaust manifold, 15... Cutting portion. Patent applicant Nissan Motor Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In a method for manufacturing an exhaust manifold gasket with a three-layer structure in which a steel plate is sandwiched between two gasket base materials, for one gasket base material in which the space between each cylinder is continuously formed,
The other gasket base material and the steel plate are connected via the arms for each cylinder, and after bonding them in three layers with the steel plate in between,
A method for manufacturing an exhaust manifold gasket, which comprises cutting and separating the other gasket base material and the arm portion of the iron plate.