JP2534437Y2 - Exhaust manifold mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to an exhaust manifold mounting structure used for an automobile engine or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 6 to 9, an exhaust manifold mounting structure 20 used for an automobile engine or the like has one end of an exhaust manifold 21a, 21b, 21c, 21d via a port side mounting member 22. attached to the cylinder head of the engine (not shown), and the other end is connected to an exhaust pipe (not shown) through an exhaust pipe-side mounting member 23.

The port side mounting member 22 is usually made of a steel plate having a thickness of 10 mm or more and has a mounting hole 22a. One end of the exhaust manifolds 21a, 21b, 21c, 21d is fitted and welded to the mounting hole 22a. . FIG. 7 shows an example.
The other end of each of the exhaust manifolds 21a, 21b, 21c, and 21d is a Voigt 2 formed by bending a sheet metal.
The forks 24, 24 are fitted and welded to mounting holes 23a formed in the exhaust pipe-side mounting member 23, which is usually made of a steel plate having a thickness of 12 mm or more. In addition, 2
5 is an insulator fixing member (not shown), 26 is a mounting hole of the port side mounting member 22 to the engine, 27 is an exhaust pipe fixing stud provided on the exhaust pipe side mounting member 23, 28
Denotes a gasket and P denotes an exhaust pipe.

[0004]

However, the conventional exhaust manifold mounting structure has the following disadvantages. (A) Port side mounting member 22 and exhaust pipe side mounting member 23
Since a mounting hole for fitting the exhaust manifolds 21a to 21d is formed by a precision press, a mold cost and a processing cost are required. (B) Port-side mounting member 22 and exhaust pipe-side mounting member 23
It takes a lot of man-hours to weld the exhaust manifold after fitting it into the mounting hole. In particular, the port side mounting member must be engine
Very high because it is attached to the cylinder head of
Exposure to temperature, susceptible to deformation due to thermal ratcheting
Environment.

This invention is based on the man-hours required for processing the port-side mounting member.
And man-hours for assembling the exhaust manifold to the port side mounting member
An object of the present invention is to provide an exhaust manifold mounting structure that is small and does not easily deform .

[0006] This invention for solving the above-end
Exhaust manifold with an outward flange
Step mounting with a step that can accommodate the outwardly facing flange
A port-side mounting member having a hole formed therein, wherein the port
The side mounting member has an outward flange of the exhaust manifold.
The exhaust manifold housed in the step of the step-like mounting hole and
The engine through the stepped mounting hole
Exhaust manifold attached to dahead with fasteners
In the mounting structure of (1), the step-
The perforations extend from the inner peripheral edge to the outer peripheral surface of the exhaust manifold.
And a cylindrical portion that comes into contact with the cylindrical member .

[0007]

Exhaust manifold mounting structure of the [action] the present invention, the exhaust manifold
A force is applied in the direction to pull the hold from the port side mounting member.
When this force is applied , this force acts so as to increase the opening diameter of the cylindrical portion provided on the inner peripheral edge of the step-shaped mounting hole. Here, since a considerably large force is required to increase the opening diameter of the cylindrical portion, the cylindrical portion may be distorted or deformed even if the exhaust manifold is subjected to a thermal ratchet phenomenon, for example. Prevent you from doing so.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The exhaust manifold mounting structure 10 of the present invention will be described below with reference to FIGS. The port-side mounting member 12 is made of a steel plate having a thickness of 2 to 3 mm, and a flange 12a is formed on a peripheral portion thereof, and four step-like mounting holes 12c are formed on the flat plate portion 12b as shown in FIG. . The exhaust pipe side mounting member 13 is also made of a steel plate having a thickness of 2 to 3 mm, and has a flange 13a formed at the peripheral edge thereof, and two stepped mounting holes 13c formed at the flat plate portion 13b as shown in FIG. I have. One end of each of the exhaust manifolds 11a, 11b, 11c, and 11d is bent outwardly after being inserted into the step-shaped mounting hole 12c of the port-side mounting member 12, and a flange 14 is formed. The flange 14 is accommodated and fitted in the step of the step-shaped mounting hole 12c of the port-side mounting member 12, and the outer surface of the flange 14 and the outer surface of the flat plate portion 12b of the port-side mounting member 12 are substantially the same as shown in FIG. Face. Note that 17
Is a gasket. On the other hand, the exhaust manifolds 11a, 11
The other ends of b, 11c, and 11d are (A) or (B) in FIG.
Fork 1 made of a pipe welded as shown in Figure 1
5 is inserted and welded, and the fork 15 is inserted into the step-like mounting hole 13c of the exhaust pipe side mounting member 13 and then bent outward as shown in FIG. In FIG. 5, 17 is a gasket, and P is an exhaust pipe. The flange 16 is housed and fitted in the step of the step-shaped mounting hole 13c of the exhaust-side mounting member 13. Flange 12
Brackets 18 are formed at three places a and 13a, and welding nuts 19 for fixing an insulator (not shown) are welded to the brackets 18.

In the above configuration, the port-side mounting member 1
2, four stepped mounting holes 12c are aligned with the exhaust ports of the cylinders of the engine (not shown),
The exhaust pipe P is aligned with the two forks 15 via the gasket 17. Therefore, exhaust gas from the engine is discharged to the exhaust pipe P via the exhaust manifolds 11a to 11d.

Since both the port side mounting member 12 and the exhaust pipe side mounting member 13 are made of a steel plate having a thickness of 2 to 3 mm, they are much lighter than the conventional port side mounting member and exhaust pipe side mounting member having a thickness of 10 mm or more. is there. Conventionally, the mounting hole for fitting the end of the exhaust manifold to the port-side mounting member and the exhaust pipe-side mounting member was formed by precision press processing, so that mold cost and processing cost were required. The holes for inserting the exhaust manifolds 11a to 11d provided in the port side mounting member 12 and the exhaust pipe side mounting member 13 are stepped mounting holes 12c and 13c, and these holes are formed by ordinary press working. Processing is simple and suitable for mass production. Further, conventionally, it took a lot of man-hours to fit and weld the ends of the exhaust manifold to the holes of the port-side mounting member and the exhaust pipe-side mounting member.
It is easy to insert the holes a to 11d into the step-shaped mounting holes 12c and 13c of the port-side mounting member 12 and the exhaust pipe-side mounting member 13. After the insertion, the ends of the exhaust manifolds 11a to 11d are bent outward. The assembling operation is simple because the flanges need only be formed.

[0011]

The present invention has the above-mentioned structure and therefore has the following excellent effects. (A) Port side mounting member (also for exhaust manifold)
When a force is applied in the direction of pulling out from the exhaust pipe side mounting member) , this force acts to increase the opening diameter of the cylindrical portion provided at the inner peripheral edge of the stepped mounting hole. Here, since a considerably large force is required to increase the opening diameter of the cylindrical portion, the cylindrical portion may be distorted or deformed even if the exhaust manifold is subjected to a thermal ratchet phenomenon, for example. Prevent you from doing so. As a result, according to the exhaust manifold mounting structure of the present invention, an excellent effect of not being easily deformed can be obtained. (B) The step-like mounting hole for inserting the exhaust manifold into the port-side mounting member and the exhaust pipe-side mounting member is easy to work, and mass productivity is superior. (C) The assembling of the exhaust manifold with the port-side mounting member and the exhaust pipe-side mounting member does not require welding as in the related art, so that it becomes simpler and the cost is reduced. Furthermore, since there is no welded portion, welding distortion is eliminated and durability is improved. (D) The insulator mounting bracket is conventionally welded to the exhaust manifold. However, in the present invention, since the insulator is formed integrally with the port side mounting member and the exhaust pipe side mounting member, the number of steps is reduced, and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment.

FIG. 2 is a detailed view of a portion A in FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a perspective view of a conventional manifold mounting structure.

FIG. 7 is a sectional view taken along line EE of FIG. 6;

FIG. 8 is a sectional view taken along line FF of FIG. 6;

FIG. 9 is a sectional view taken along line GG of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Exhaust manifold mounting structure 11a-11d Exhaust manifold 12 Port side mounting member 12a Flange 12c Stepped mounting hole 13 Exhaust pipe side mounting member 13a Flange 13c Stepped mounting hole 14 Flange 16 Flange

Claims (1)

(57) [Scope of request for utility model registration] 1. An exhaust system having an outward flange formed at an end.
A step having a step capable of accommodating the manifold and the outward flange;
A port-side mounting member having a hole formed therein , wherein the port-side mounting member faces outward of the exhaust manifold.
The flange is housed in the step of the step-shaped mounting hole and
With the air manifold inserted through the stepped mounting hole,
Exhaust attached to the cylinder head of the
In the manifold mounting structure, the step-shaped mounting hole of the port-side mounting member has an inner peripheral edge portion.
From the cylindrical part that abuts along the outer peripheral surface of the exhaust manifold.
Exhaust manifold mounting structure characterized by comprising.