WO2015152303A1

WO2015152303A1 - Pipe cover

Info

Publication number: WO2015152303A1
Application number: PCT/JP2015/060271
Authority: WO
Inventors: 政博甚田
Original assignee: フタバ産業株式会社
Priority date: 2014-03-31
Filing date: 2015-03-31
Publication date: 2015-10-08
Also published as: JPWO2015152303A1

Abstract

This pipe cover has: a main body formed in a tubular shape and having a fissure split along the axial direction; an abutted section positioned at one end in the axial direction of the main body and at which both sides of the fissure of the main body are abutted during installation to piping; and an overlap section positioned at the other end in the axial direction of the main body and at which one of the two sides of the fissure of the main body overlaps the other side during installation to piping.

Description

Tube cover

Cross-reference of related applications

This international application claims priority based on Japanese Patent Application No. 2014-72442 filed with the Japan Patent Office on March 31, 2014. The entire contents are incorporated herein by reference.

The present invention relates to an exhaust pipe and a pipe cover for other pipes.

As a vehicle internal combustion engine, a high-performance internal combustion engine such as a V-type engine may be used.
A high-performance internal combustion engine is often mounted on a vehicle such that the crankshaft shaft is transverse to the traveling direction of the vehicle (so-called horizontal placement). In this case, the pistons are arranged before and after the crankshaft shaft. It is done.

Therefore, as shown in FIG. 1, the exhaust device 1 is formed in a shape that takes in exhaust gas from before and after the internal combustion engine. In the exhaust device 1, exhaust manifolds having

first catalysts

10 and 11 are attached to the front and rear of the internal combustion engine.

Further, a Y-shaped exhaust merging pipe 3 for merging the exhaust gases sent from the

first catalysts

10 and 11 is attached to the rear of the rear first catalyst 11, and further to the rear of the exhaust merging pipe 3. The second catalyst 13 is installed.

The exhaust merging pipe 3 is attached to the rear side of the first catalyst 11 on the rear side, but is separated from the first catalyst 10 on the front side. Therefore, the exhaust merging pipe 3 and the first catalyst 11 are connected to the exhaust merging pipe. 3 is connected through a long exhaust pipe 12 extending from 3.

Thus, in the exhaust device 1 connected to the horizontally placed internal combustion engine, the lengths of the exhaust paths from the

first catalysts

10 and 11 to the second catalyst 13 are different. The

exhaust pipes

3 and 12 having the exhaust paths having different lengths are called unequal length exhaust pipes.

In the exhaust merging pipe 3, the upstream bifurcated part and the downstream part are called branches. Among the upstream branches, the branch connected to the first catalyst 11 is the first branch 31, the branch connected to the exhaust pipe 12 is the second branch 32, and the downstream branch is the third branch. It is called part 33.

Next, the 1st heat retention tool 4 and the 2nd heat insulation 5 attached to the 1st branch part 31 and the 3rd branch part 33 are demonstrated using FIG.
The first heat insulator 4 is attached to the first branch portion 31 connected to the first catalyst 11 among the first branch portion 31, the second branch portion 32, and the third branch portion 33 constituting the exhaust gas merging pipe 3. The second heat retaining device 5 is attached to the third branch portion 33 connected to the second catalyst 13.

The first heat insulator 4 includes a tube cover 6 formed in a substantially cylindrical shape, and a heat insulating material 41 packed between the inner wall surface of the tube cover 6 and the outer wall surface of the first branch portion 31.
The second heat retaining device 5 includes a tube cover 50 formed in a substantially cylindrical shape, and a heat insulating material 51 packed between the inner wall surface of the tube cover 50 and the outer wall surface of the third branch portion 33.

The tube covers 6 and 50 are made of a stainless steel heat shield, and the heat insulating materials 41 and 51 are made of glass wool. (Patent Document 1)

Japanese Patent Application No. 2014-70903

In the exhaust merging pipe 3 described above, the first branch portion 31 is formed in a shape that is obtained by bending a straight pipe into an obtuse angle.
The first branch portion 31 has a portion from the bending point 31c to the junction point of the second branch portion 32 and the third branch portion 33 (hereinafter referred to as the first portion 31a), and forward from the junction point. A portion extending in a straight line toward the front side of the bending point 31c (hereinafter referred to as a second portion 31b) is disposed so as to extend obliquely forward and upward from the bending point 31c.

However, since the first branch portion 31 is bent at an obtuse angle, the downstream side (the merging side with the second branch portion 32) of the portion to which the tube cover 6 constituting the first heat insulator 4 is attached. When the pipe is bent, the cross-sectional shape may vary in the vicinity of the bent portion due to the difference in material lot (for example, an elliptical shape).

Therefore, even if the tube cover 6 is formed in a substantially cylindrical shape, a gap is formed between the edge of the tube port located on the downstream side of the tube cover 6 and the outer peripheral surface of the first branch portion 31, and the gap This part may become unwelded during welding, and the tube cover 6 may not be able to sufficiently suppress the heat radiation from the first branch portion 31.

In addition, if there is a gap between the tube port of the tube cover 6 and the outer peripheral surface of the first branch portion 31, it may be difficult to fix the tube cover 6 to the first branch portion 31 by welding. It was.
In one aspect of the present invention, it is desirable to provide a tube cover that is less likely to cause a gap between the edge of the tube port of the tube cover and the piping when the tube cover is attached to the piping even if the shape of the piping varies.

The tube cover of one aspect of the present invention is
A main body that is formed in a cylindrical shape and has a split that is split along the axial direction;
Abutting portions that are located on one end side in the axial direction and are attached to the pipe, and on both sides of the split,
It is located on the other end side in the axial direction, and when attached to the pipe, one side of the both sides of the split is superposed on the other side.

This tube cover is attached so that the tube port located on the other end side in the axial direction faces the side where the pipe is bent. Then, even if the cross-sectional shape of the pipe varies due to bending, this pipe cover can be squeezed on the other end side in the axial direction by the overlapping portion, so the edge of the tube port located on the other end side in the axial direction and the outer periphery of the pipe It can be attached to the piping without causing a gap between the surface. Therefore, when this pipe cover is used, the pipe cover can be firmly fixed to the pipe by welding.

In the above, when one side of both sides of the split is overlapped with the other side, the other side moves in the direction of reducing the diameter of the main body under one side of both sides of the split You may form in the shape in which the movement space to be formed is formed.

Since the main body of the tube cover is formed of a hard material, if such a movement space is formed, the diameter can be smoothly reduced.
In addition, since the movement space will become easy to generate | occur | produce a welding defect if the magnitude | size is too large, suitable space is good.

In the above, a hole covering portion that extends from the other end in the axial direction, and covers a hole formed on the other end side in the axial direction by overlapping may be provided.
If it does in this way, since a hole covering part closes the hole formed in the other end side of an axial direction by superposition, it can control that a hole is opened from the inside of a main part and heat is radiated.

In addition, when the overlapping portion overlaps one side of both sides of the split with the other side, the other side moves below the one side of both sides of the split in the direction of reducing the diameter of the main body. In the case where the moving space is formed in a shape, the hole is formed by the moving space.

It is a front view of an exhaust device. It is a front view of an exhaust merging pipe. It is a perspective view of the pipe cover of this embodiment, and has shown a mode that it was attached to piping. FIG. 4A is a plan view of the tube cover. FIG. 4B is an enlarged view of a portion surrounded by reference numeral VB in FIG. 4A, and a part of the configuration is shown in a transparent view with a one-dot chain line indicating the upper side portion 60 t and a dotted line indicating the lower side portion 60 u. FIG. 5A is a view of the width portion indicated by the symbol A in FIG. 4B with respect to the upper portion 60t, as viewed from the direction of the arrow VA. The portion hidden by the lower portion 60u is indicated by hatching, but is not a cross section. 5B is a VB-VB cross-sectional view of FIG. 4B. FIG. 5C is a sectional view taken along the line VC-VC of FIG. 4B. FIG. 6A is a front view of the tube cover. 6B is a cross-sectional view taken along the line VIB-VIB of FIG. 6A. 6C is a VIC-VIC cross-sectional view of FIG. 6A. FIG. 7A is a cross-sectional view taken along the line VIB-VIB in FIG. 6A and shows a state where no aperture is applied. FIG. 7B is a cross-sectional view taken along the line VIB-VIB in FIG. 6A and shows a state when a diaphragm is being applied.

DESCRIPTION OF SYMBOLS 1 ... Exhaust device 3 ... Exhaust merge pipe 6 ... Pipe cover 6a ... Split 8 ... Movement space 8a ... Hole 9 ... Pipe 50 ... Pipe cover 60 ... Main body 60c ... Edge 60u ... Lower part 60t ... Upper part 61 ... Abutting part 62 ... Overlapping part 62a ... Step part 62b ... Step maintaining part 63 ... Hole covering part

Embodiments of the present invention will be described below with reference to the drawings.
The tube cover 6 of this embodiment will be described.
Since the exhaust merging pipe 3 to which the pipe cover 6 is attached and the exhaust device 1 to which the exhaust merging pipe 3 is attached have already been described in the background art section, description thereof will be omitted below.

Moreover, about the code | symbol of structures other than the tube cover 6, the code | symbol demonstrated in the column of background art is used if necessary.
Further, in the present embodiment, “6” is used as a symbol indicating the tube cover, but this does not indicate the same configuration as the tube cover described in the background art. This is to clarify which part of the background art has caused the present invention by using a problem as a hint. However, this does not prevent the tube cover 6 of this embodiment from being used as a cover for other parts such as the tube cover 50 described in the background art.

As shown in FIG. 3, the tube cover 6 of the present embodiment includes a main body 60 that is formed in a cylindrical shape and has a split 6 a that is cracked along the axial direction.
Also, the main body 60 is formed such that both end portions in the axial direction (portions having a predetermined width from both end portions in the axial direction of the main body 60) 60a and 60b are gradually reduced in diameter toward the respective end portions. Yes.

When one end side α in the axial direction of the main body 60 is attached to the pipe 9, both sides of the split 6a are brought together. Hereinafter, this associated portion is referred to as a butt portion 61.
On the other hand, when the other end side β in the axial direction of the main body is attached to the pipe 9, one side of both sides of the split 6a is overlapped with the other side. Hereinafter, the overlapped portion is referred to as a superposition portion 62.

Further, the main body 60 is formed in a shape in which the overlapping portion 62 is extended in the axial direction, and has a hole covering portion 63 that extends outward from the edge portion 60c on the other end side β of the main body 60. ing.
Next, details such as the shapes of the abutting portion 61 and the overlapping portion 62 will be described.

Here, in describing the abutting portion 61 and the overlapping portion 62, as shown in FIG. 4A, both side portions sandwiching the split 6a of the main body 60 are referred to as an upper portion 60t and a lower portion 60u.
The shape of the portion corresponding to the abutment portion 61 in the upper portion 60t and the portion facing the lower portion 60u will be described with reference to FIG. 5A.

The portion corresponding to the abutting portion 61 of the upper portion 60t has a portion 61a that swells for a while as it goes from the one end side α in the axial direction of the main body 60 to the other end β in the vicinity of the overlapping portion 62, The portion 61b closer to the overlapping portion 62 than the portion 61a that swells for a while is formed with a thickness that maintains the bulge. The other portion 61c of the abutting portion 61 is formed with a half thickness of the portion 61b that maintains the bulge.

When the main body 60 is attached to the pipe 9, the portion corresponding to the abutting portion 61 in the upper side portion 60t is abutted with the portion corresponding to the abutting portion 61 in the lower side portion 60u, but the lower side portion 60u. Of these, the portion corresponding to the abutting portion 61 has the same thickness as the other portion 61c of the upper portion 60t throughout.

Therefore, the

portions

61a and 61b other than the other portion 61c of the upper portion 60t are butted against the lower portion of the

portions

61a and 61b, as indicated by hatching in FIG. 5A.

Next, in the upper part 60t, the part corresponding to the abutting part 61 and the overlapping part 62, and cutting the boundary part between the abutting part 61 and the overlapping part 62, the shape of the part forming each thickness, This will be described with reference to FIGS. 5B and 5C.

The portion of the upper portion 60t corresponding to the overlapping portion 62 is formed with the same thickness as a whole when viewed in the direction of arrow E1 (see FIG. 4B) as shown in FIG. 5B. In the vicinity of the split 6a in the portion corresponding to the overlapping portion 62, a stepped portion 62a is formed that rises upward for a while and rises one step with respect to the other portion 62c. Of the portion corresponding to the overlapping portion 62, the portion (step maintaining portion 62b) closer to the split 6a than the step portion 62a maintains a state where the step portion 62a is one step higher than the other portions.

On the other hand, the portion corresponding to the abutting portion 61 in the upper portion 60t is in the vicinity of the split 6a and upward as it approaches the split 6a as shown in the direction of the arrow E2 (see FIG. 4B) as shown in FIG. 5C. There is a portion 61d that swells for a while. The portion 61e closer to the split 6a than the portion 61d that swells for a while is formed with a thickness that maintains the bulge. The other portion 61f is formed with a half thickness of the portion 61e that maintains the bulge.

In the tube cover 6, when the main body 60 is attached to the pipe 9, the abutting portion 61 is abutted with the portions forming the thickness of the lower side portion 60 u and the upper side portion 60 t, but the overlapping portion 62 is a stepped portion. By providing 62a, a moving space 8 is formed below the portion of the step maintaining portion 62b between the step portion 62a and the split 6a, and the tip of the step maintaining portion 62b is Overlaid on the side 60u.

As shown in FIGS. 6A, 6B, and 6C, the moving space 8 is formed from a boundary portion between the abutting portion 61 and the overlapping portion 62 to an edge portion 60c on the other end side β of the main body 60.
Thus, when the moving space 8 is formed, as shown in FIG. 7A, a hole 8 a is formed on the other end side β in the axial direction of the main body 60 by overlapping.

Therefore, the hole covering portion 63 (see FIG. 1) described above covers and conceals the hole portion 8a from the outside.
Further, since the tube cover 6 is formed with the moving space 8, when the main body 60 is squeezed in the circumferential direction, as shown in FIG. 7B, the lower side portion 60u can move in the moving space 8, Can be squeezed.

The tube cover described above has the following characteristic operational effects.
Since this tube cover 6 can be narrowed at the other end side β in the axial direction by the overlapping portion 62, the cross-sectional shape of one end side of the pipe 9 in the portion where the pipe cover 6 is attached to the pipe 9. Even if it varies, it can be attached so that there is no gap between the edge 60c of the main body 60 on the end side and the tube 9. At this time, the moving space 8 is also closed depending on the degree of variation (degree of non-circularity, degree of flatness, etc.).

Moreover, since the main body 60 of the tube cover 6 is formed of a hard material, the diameter can be reduced smoothly by forming the moving space 8.
In addition, even if the tube cover 6 is squeezed and the hole 8a is not blocked and the hole 8a remains, the hole cover 63 closes the hole 8a generated by forming the moving space 8. Therefore, it is possible to prevent heat from being radiated from the inside of the main body 60 through the hole 8a.
[Other Embodiments]
The tube cover 6 described in the above embodiment is merely an example, and the present invention is not limited to this.

Claims

A main body that is formed in a cylindrical shape and has a split that is split along the axial direction;
Abutting portions that are located on one end side in the axial direction and are attached to the pipe, and on both sides of the split,
A pipe cover having an overlapping portion that is positioned on the other end side in the axial direction and overlapped with one side of the both sides of the split when the pipe is attached to the pipe.
The tube cover according to claim 1,
The overlapping portion is configured such that when one side of both sides of the split is overlapped with the other side, the other side of the other side in the direction of reducing the diameter of the main body is below one side of the both sides of the split. A tube cover formed in a shape that forms a moving space to be moved by the side.
The tube cover according to any one of claims 1 and 2,
A tube cover having a hole covering portion extending from the other end in the axial direction and covering a hole formed on the other end side in the axial direction by the overlapping.