JP2612427B2 - Welded structure of plate and pipe of exhaust manifold and method of manufacturing exhaust manifold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate for an exhaust manifold.
It relates to a manufacturing <br/> method of welding structure and an exhaust manifold of the wood and the pipe member, particularly, Ren設Su the engine cylinder head
That in a state in which fitted the pipe material into the through hole of the plate member, the welding of the pipe for welding the leading end of the pi <br/> flop material sheet
About the suitable welded structures.

[0002]

2. Description of the Related Art Generally, an engine of an automobile is provided with, for example, Japanese Utility Model Laid-Open No.
An exhaust manifold as disclosed in JP-A-13222 is arranged. Recently, in such an exhaust manifold, a pipe manifold in which an exhaust pipe constituting the exhaust manifold is formed of a pipe material has been developed.

Conventionally, with such a pipe manifold,
Fig. 4 shows how to fix the pipe material to the manifold body.
So that it is formed on the plate material 11 forming the manifold body
After the pipe material is inserted into the through hole 13 to be
5 from the insertion side of the pipe material 15 and the plate material 11
Contact and forming a weld bead 17
You. However, with such a pipe manifold
IsAs disclosed in Japanese Utility Model Laid-Open No. 64-49627.
In addition, the pipe material 15 becomes complicatedSuccumbSinging. This is shown in FIG.
More specifically, the manifold is connected to the engine cylinder head.
hold The pipe material 1 is inserted into the through hole of the plate material 11 forming the main body.
5 is inserted, the tip of the pipe member 15 is attached to the plate member 11.
To weld. In this way, the pipe member 15 is complicatedly bent.
BecauseWelding on the insertion side of pipe material 15 to plate material 11
It has been difficult to position the torch.

[0004] Therefore, in such a pipe manifold,
As shown in FIG. 6 , as a welding structure to which the pipe member 15 can also be applied , the pipe member 15 is inserted into the through hole 13 of the plate member 11, and then the distal end of the pipe member 15 is moved from the side opposite to the insertion direction of the pipe member 15. It is considered that the weld bead 19 formed by welding to the plate material 11 is plane-cut by milling.

[0005]

However, in such a method, as shown in FIG. 7 , the angle θ at which the weld bead 19 enters the outer periphery of the pipe material 15 becomes very large, and There is also a relationship between the gap A and the small gap W formed between the pipe member 15 and stress concentrates on this portion A, and the pipe member 15 may be broken from this portion A due to fatigue.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and is intended for a bent pipe manifold.
It is an object of the present invention to provide a welding structure of a plate material of an exhaust manifold, a pipe material, and a method of manufacturing an exhaust manifold, which is suitable and can greatly improve the welding strength of a pipe material to a plate material as compared with the related art. I do.

[0007]

Means for Solving the Problems of claims 1 invention, ene
A pipe material is inserted into a through hole formed in the plate material from one surface side of the plate material connected to the gin cylinder head, and a distal end of the pipe material is welded from the other surface side of the plate material to form a pipe material and a through hole. Exhaust manifold formed by forming a weld bead on a nearby plate
In the welded structure between the plate material and the pipe material of the hold , the through hole has a small diameter portion formed on one surface side of the plate material, a large diameter portion formed on the other surface side, and a taper connecting the small diameter portion and the large diameter portion. The pipe material has its tip end inserted from one surface side of the plate material to the tapered surface through the small diameter portion of the through hole, and the welding bead is formed from the tapered surface of the through hole to one surface side of the plate material. That it is formed including the portion near the opening end of the through hole.
It is a feature .

[0008] The second aspect of the present invention, the inside diameter of the small diameter portion of the through hole, and characterized by a slightly larger diameter than the outer diameter of the pipe
Is what you do. The invention according to claim 3 is an engine cylinder
Exhaust system made by welding pipe material to a plate material connected to the head
In the method for manufacturing a manifold, a through hole having a small-diameter portion on one surface side, a large-diameter portion on the other surface side, and a tapered surface connecting the small-diameter portion and the large-diameter portion is formed. In welding the plate material and the pipe material, the pipe material is inserted from the small diameter portion of the through hole formed on one surface side of the plate material to the position of the tapered surface connected thereto, and then the other surface side of the through hole Insert the electrode from the large diameter side connected to the tapered surface formed in
The present invention is characterized in that a distal end portion of a pipe material is welded, and a weld bead is formed in a region including a portion near a through hole opening end on one surface side of a plate material from a tapered surface of the through hole.

[0009]

According to the first to third aspects, first, there is provided a small-diameter portion on one surface side, a large-diameter portion on the other surface side, and a taper surface connecting the small-diameter portion and the large-diameter portion. A plate material having a hole formed therein and a pipe material to be fitted and welded into a through hole of the plate material are prepared. The next, connecting the pipe, fitted from the small diameter portion of the through hole formed on one side of the plate to a position of the tapered surface connected thereto, the following Ide, the tapered surface formed on the other surface side of the through-hole From the large-diameter portion side, an electrode is inserted, the tip of the pipe material is welded, and a weld bead can be formed in a region from the tapered surface of the through hole to a portion including the portion near the opening end of the through-hole on one surface side of the plate material. .

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 shows an exhaust manifold according to claims 1 and 2.
4. A welded structure between a plate material of a hold and a pipe material ,
FIG. 3 shows an embodiment of a method of manufacturing an exhaust manifold ,
In the drawing, reference numeral 21 indicates, for example, a metal plate forming the manifold body.

As shown in FIG. 2, a through hole 23 is formed in the plate 21. The through-hole 23 is formed in the plate 2
1 includes a small diameter portion 27 formed on one surface 25 side and a large diameter portion 31 formed on the other surface 29 side. The small diameter portion 27 and the large diameter portion 31 are connected by a tapered surface 33. The distal end 37 of the pipe 35 is fitted into the small diameter portion 27, and the distal end 37 of the pipe 35 is welded from the other surface 29 of the plate 21.

The inside diameter of the small diameter portion 27 of the through hole 23 is
As shown in FIG. 2, the outer diameter of the pipe member 35 is slightly larger. And, by this welding, the weld bead 3
As shown in FIG. 3, 9 is formed including a portion 41 near the opening end of the through hole on the one surface 25 side of the plate member 21. As shown in FIG. 2, the welding structure of the exhaust manifold plate and pipe material and the method of manufacturing the exhaust manifold configured as described above include the pipe material 35 on the small diameter portion 27 of the plate material 21.
Is inserted until the distal end surface 43 is positioned at the end of the large-diameter portion 31, and then an electrode is inserted from the large-diameter portion 31 side of the plate 21.
It is formed by welding a distal end portion 37 of a pipe material 35 and forming a weld bead 39 in a region including a portion 41 near the opening end of the through hole on the one surface 25 side of the plate material 21 from the tapered surface 33 of the through hole 23 (claim). 3).

Thus, the exhaust system constructed as described above
In the welding structure of the plate material of the manifold and the pipe material, only the tip portion 37 of the pipe material 35 is inserted into the through hole 23, and the welding bead 39 is connected to one surface 25 of the plate material 21, that is, the insertion side of the pipe material 35. As shown in FIG. 3, since the surface 41 includes the portion 41 near the opening end of the through hole,
Angle θ at which welding bead 39 enters the outer periphery of pipe material 35
Is significantly smaller than before, and welding beads 39
Is formed by melting together with the small diameter portion 27 and the pipe material 35, and since the gap between the small diameter portion 27 and the pipe material 35 is completely eliminated by the welding bead 39, the welding strength of the pipe material 35 to the plate material 21 is reduced. It is possible to greatly improve.

[0014]

As described above, according to the first to third aspects, the angle at which the weld bead enters the outer periphery of the pipe material can be made significantly smaller than before, and the angle between the small diameter portion and the pipe material can be reduced. As a result, the gap is completely eliminated by the weld bead,
There is an advantage that the welding strength of the pipe material to the plate material can be greatly improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a view showing a welded structure between a plate member and a pipe member of an exhaust manifold according to claim 1 and 2, and an exhaust manifold according to claim 3;
It is a longitudinal cross-sectional view which shows one Example of the manufacturing method of.

FIG. 2 is a longitudinal sectional view showing a state before welding of the pipe member welding structure of FIG. 1;

FIG. 3 is an explanatory diagram showing details of a weld bead in FIG. 1;

FIG. 4 is an explanatory view showing a conventional method for welding a pipe material to a manifold body.

FIG. 5 is an exhaust manifold using a conventional bent pipe material.
FIG.

FIG. 6 is an explanatory view showing a conventional method of welding a pipe material to a manifold body.

FIG. 7 How to weld pipe material to conventional manifold body
It is explanatory drawing which shows a method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Plate material 23 Through-hole 25 One surface 29 Other surface 35 Pipe material 37 Tip 39 Weld bead 41 Near end of through-hole opening end

Claims (3)

(57) [Claims] 1. A pipe member (35) is inserted into a through hole (23) formed in a plate member (21) from one surface (25) side of a plate member (21) connected to an engine cylinder head. The tip (37) of the pipe (35) is welded from the other surface (29) side of the plate (21), and the tip (3) of the pipe (35) is welded.
7) and a plate (2 ) of an exhaust manifold formed by forming a weld bead (39) in a plate (21) near the through hole (23).
In the welding structure of 1) and the pipe member (35) , the through hole (23) is formed on the small-diameter portion (27) formed on one surface (25) side of the plate member (21) and on the other surface (29) side. Large diameter part (31), small diameter part (27) and large diameter part (31)
And a taper surface (33) connecting the pipe member (35).
1) From the one surface (25) side, the small diameter portion (2) of the through hole (23)
7) is inserted through the tapered surface (33), and the weld bead (39) is inserted into the tapered surface (3) of the through hole (23).
3) A welding structure between a plate member and a pipe member of an exhaust manifold, wherein the plate member and the pipe member are formed so as to include a portion (41) near the opening end of the through hole on one surface (25) side of the plate member (21). 2. The exhaust manifold plate according to claim 1, wherein the inside diameter of the small diameter portion of the through hole is slightly larger than the outside diameter of the pipe material. <br/> Welded structure of pipe material. 3. A plate member connected to an engine cylinder head.
Exhaust manifold made by welding pipe material (35) to (21)
In the method for manufacturing a mold, a small-diameter portion (27) is provided on one surface (25) side, and the other surface (29) is provided.
A plate material having a large-diameter portion (31) on its side and a perforated hole (23) formed by connecting the small-diameter portion (27) and the large-diameter portion (31) with a tapered surface (33) ( 21) and pipe material (3
In welding 5), the pipe material (35) is connected to the small diameter portion (27) of the through hole (23) formed on the one surface (25) side of the plate material (21) by connecting to the tapered surface (33). The electrode is inserted from the large diameter portion (31) side connected to the tapered surface (33) formed on the other surface (29) side of the through hole (23), and the pipe material ( The tip (37) of (35) is welded, and a weld bead is formed from the tapered surface (33) of the through hole (23) to a region including the portion (41) near the opening end of the through hole on one surface (25) of the plate (21). Exhaust characterized by forming (39)
Manifold manufacturing method.