JPH07238828A - Exhaust collecting device and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the device from being cracked, lighten it and simplify its manufacture by forming one exhaust pipeline and its confluence section oat of main pipe made material, and also forming the other exhaust pipeline out of subpipe made material. CONSTITUTION:A main exhaust path made out of main pipe made material is connected to an exhaust manifold 4 at one side of a V-type engine 1. A sub-exhaust path 13 made out of sub-pipe made material is also connected to an exhaust manifold 5 at the other side of the engine. Apaspage hole 12 is formed over the main pipe material, and a slice 14 consisting of a part of a guide section 15 is formed at the periphery section of the passage hole 12 at the upstream side of exhaust gas. Furthermore, the subpipe material forming the sub-exhaust path 13 i welded to a section enclosing the passage hole 12 and the slice 14 so as to be joined in such a way that the sub-exhaust path 13 and the downstream section 11A of the confluence section of the main exhaust path 11 are formed into an U shape via the confluence section 8 By this constitution, since force is small, which restrains the confluence section 8 from being deformed, no stress concentration appears in the confluence section 8, stresses are dispersed, and the occurrence of cracks can thereby be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas collecting apparatus mounted on an exhaust system of an automobile and a manufacturing method thereof.

[0002]

2. Description of the Related Art For example, in an exhaust system mounted on a V-type engine, the exhaust pipe lines respectively connected to the left and right exhaust manifolds of the V-type engine merge at a position below the V-type engine to form a merging pipe. Become a road. In such an engine layout, due to space limitations, the exhaust gas from one exhaust pipe is designed to flow straight to the confluence pipe,
Although there is no unreasonable flow, the structure in which the exhaust gas from the other exhaust gas is abruptly reversed and flows into the merging conduit at the confluence of the two exhaust conduits and the merging conduit.

For this reason, the exhaust gas flowing from the other exhaust pipe line is forcibly folded back at the merging portion and flows while forming a turbulent flow in the merging pipe line, so that a swirl flow is generated, and accordingly,
There is a problem that abnormal noise such as radiated sound is generated.

Therefore, a structure is required to prevent the generation of abnormal noises such as radiated noise by causing the exhaust gas to flow substantially evenly without generating a vortex at the merging portion, and various structures have been devised. An exhaust gas collecting device shown in Japanese Patent Laid-Open No. 5-27224 is known.

FIG. 6 shows an exhaust gas collecting apparatus shown in Japanese Utility Model Laid-Open No. 5-27224. In the figure, reference numeral 101 is an engine, and this engine 101 includes an exhaust manifold 10
Exhaust manifold 10 with one end of 2, 103 attached
At the other ends of 2, 103, exhaust pipe lines 104, 10 are provided, respectively.
One end of 5 is connected. One of the exhaust pipes 104 is bent at a right angle to form a first horizontal portion 104A.

Further, the other exhaust pipe line 105 is integrated with an exhaust merging block 106 made of casting, and constitutes a part of the exhaust merging block 106. The exhaust merging block 106 is located below the engine 101 and has one exhaust pipe line 1
04 and the other exhaust pipe line 105 are provided with a merging portion 107, and the merging portion 107 guides the exhaust gas.
It has 7A.

A confluence section 107 is provided in the exhaust confluence block 106.
The merging conduit 108 is formed on the outlet side of the
Forms a linear main exhaust path 109 with one exhaust pipe line 104.

The sub-exhaust passage formed in the other exhaust pipe 105 and the downstream portion 109 of the confluence of the main exhaust passage 109.
A has a substantially U shape through the confluence portion 107.

[0009]

However, in the conventional exhaust gas collecting apparatus, due to the vibration of the engine 101 and the traveling of the vehicle, the exhaust pipes 104, 105 are not connected to the exhaust pipes 104, 105.
The force to deform 105 is the exhaust merging block 10.
6 is transmitted to the vicinity of the merging portion 107. The other exhaust line 1
Sub exhaust path and main exhaust path 109 formed in 05
Since the integrated portion X is formed in the downstream portion 109A of the merging portion, the vicinity of the merging portion 107 constitutes a kind of rigid body structure as a whole. Therefore, when the stress acts, the two exhaust pipe lines 104 and 105 and the confluent pipe line 108 constrained by the integrated portion X cannot be deformed, so that there is a problem that cracks are likely to occur in the integrated portion X. If the wall thickness is increased in order to prevent the occurrence of cracks, the weight will increase.

Further, in a narrow space below the engine 101, a sub-exhaust passage formed in the other exhaust pipe line 105 and a downstream portion 109A of the confluence portion of the main exhaust passage 109 are formed into a substantially U-shape through the confluence portion 107. 2 because they are connected
The structures of the two exhaust lines 104, 105 and the merging line 108 are forced to be cast. for that reason,
There is a problem that the weight of the two exhaust pipe lines 104, 105 and the merging pipe line 108 becomes heavy, manufacturing becomes large, and cost is increased.

Further, since a catalytic converter (not shown) burns and removes unburned components such as CO and HC components in the exhaust gas by the heat of the exhaust gas, the catalytic converter is started at the start of engine operation. It is required to rapidly heat and warm the catalyst carrier inside.

However, since the exhaust merging block 106 is made of cast metal, it has a large plate thickness and a large heat capacity. Therefore, especially at the start of engine operation when the outside air temperature is low, such as in winter, the exhaust gas from the engine 101 is likely to be deprived of heat by the exhaust merging block 106 having a large heat capacity, and the heat easily escapes to lower the temperature of the exhaust gas. There's a problem. Therefore, there is a problem that unburned components such as CO component and HC component in the exhaust gas are difficult to be burned by the heat of the exhaust gas and are hard to be removed.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an exhaust gas collecting apparatus which can prevent cracks from occurring, reduce the weight, and simplify the manufacturing. is there.

[0014]

The invention according to claim 1 is
A pair of exhaust pipes provided on both sides of the engine, a confluence part having a guide part that rectifies the exhaust gas, where the exhaust pipes are gathered at a position below the engine, and one concatenation is connected to the confluence part. A sub-exhaust passage formed in the other exhaust pipe and a downstream portion of the main exhaust passage where the main exhaust passage merges into a substantially U-shape through the junction. In the exhaust collecting device connected to the exhaust gas collecting device, one of the exhaust pipe line and the merging pipe line is formed by one main pipe material, and a passage hole is formed in the main pipe material, and the exhaust gas upstream of the passage hole of the main pipe material is formed. Provide a tongue piece that constitutes a part of the guide portion on the side edge, configure the other exhaust pipe line with a sub pipe material, and weld the sub pipe material to the main pipe material while surrounding the passage hole and tongue piece. It is characterized by

According to a second aspect of the present invention, a main exhaust path made of a main pipe material is connected to one side of the engine, and a sub exhaust path made of a sub pipe material is connected to the other side of the engine. A passage hole is formed in the pipe material, and a tongue forming a part of a guide portion for rectifying the exhaust gas is provided at an edge portion of the passage hole of the main pipe material on the upstream side of the exhaust gas. It is characterized in that the sub-pipe material is joined and welded to the main pipe material so as to have a substantially U shape through the downstream portion and the confluent portion so as to surround the passage hole and the tongue piece.

According to a third aspect of the present invention, in the second aspect of the invention, the tongue piece is formed by crushing the exhaust gas upstream side of the edge portion of the passage hole. The invention according to claim 4 is characterized in that, in the invention according to claim 2, the tongue piece is formed by being welded to an edge portion of the passage hole on the exhaust gas upstream side.

[0017]

In the first aspect of the invention, one exhaust pipe line and the merging pipe line are made of one main pipe material, and the other exhaust pipe line is made of a sub pipe material.
The main pipe material and the sub pipe material are less likely to receive the restraint force at the joining portion, and are deformed as a whole, and the force acting on the main pipe material and the sub pipe material escapes. Therefore, stress concentration is reduced at the confluence, and the stress is dispersed.

According to the second aspect of the present invention, a passage hole is formed in the main pipe material, and a part of the guide portion for rectifying the exhaust gas is provided at the edge portion of the passage hole of the main pipe material on the upstream side of the exhaust gas. A constituting tongue is provided.

A main exhaust path made of the main pipe material having the above structure is connected to one side of the engine, and a sub exhaust path made of the sub pipe material is connected to the other side of the engine.

Then, the sub-pipe material is joined and welded to the main pipe material so as to form a substantially U shape through the merging portion downstream portion of the main exhaust passage and the passage hole and the tongue piece surrounding the main pipe material.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an exhaust gas collecting apparatus according to an embodiment of the present invention.

In the figure, reference numeral 1 is a V-type engine, and the left and right cylinder heads 2 and 3 of the V-type engine 1 are
One ends of the exhaust manifolds 4 and 5 are mounted, and the other ends of the exhaust manifolds 4 and 5 are connected to one ends of exhaust pipe lines 6 and 7, respectively.

One of the exhaust pipe lines 6 is bent at a right angle to form a first horizontal portion 6A. The other exhaust pipe line 7 is bent at a right angle to form a second horizontal portion 7A, and is bent again at its tip to form a bent portion 7B.

Below the V-type engine 1, the first horizontal portion 6A of the one exhaust pipe line 6 and the second horizontal portion 7A of the other exhaust pipe line 7 are combined to form a merging portion 8. A merging conduit 9 is connected to the merging portion 8.

A catalytic converter 10 is installed under the floor of the vehicle (shown) in the middle of the confluence line 9. The merging section 8 will be described in detail.

The merging pipe line 9 and one exhaust pipe line 6 are continuously formed of a main pipe material. Inside the main pipe material, the merging conduit 9 and the first exhaust conduit 6
A linear main exhaust path 11 is formed with the horizontal portion 6A.

A passage hole 12 is formed in the main pipe material. Further, the other exhaust pipe line 7 is made of a sub pipe material, and the sub exhaust passage 13 is formed inside thereof.

A guide portion 15 for rectifying the exhaust gas is formed in the merging portion 8. A tongue piece 14 forming a part of the guide portion 15 is provided at an edge of the passage hole 12 of the main pipe material on the exhaust gas upstream side. The tongue piece 14 is inclined downward.

Main pipe material passage hole 12 and tongue piece 14
The sub-pipe material is joined and welded to a portion surrounding the to form the confluence portion 8. The welding bead W in the welded joint has a substantially circular shape.

The guide portion 15 is composed of the outer curved wall surface 7C of the bent portion 7B of the other exhaust pipe 7 and the tongue piece 14. Further, the sub-exhaust passage 13 and the downstream portion 11A of the main exhaust passage 11 at the merging portion are connected to each other through the merging portion 8 in a substantially U shape.

Next, the manufacturing method of this embodiment will be described. First, the main exhaust path 11 made of a main pipe material is connected to the exhaust manifold 4 which is one side of the V-type engine 1. Next, in the exhaust manifold 5 on the other side of the V-type engine 1, the sub exhaust path 13 made of a sub pipe material is used.
Connect.

Then, the passage hole 12 is formed in the main pipe material, and the tongue piece 14 forming a part of the guide portion 15 is formed at the edge portion of the passage hole 12 of the main pipe material on the exhaust gas upstream side. Since the tongue piece 14 is formed by crushing the edge of the passage hole 12 on the upstream side of the exhaust gas, the work of forming the tongue piece 14 is simple.

Further, the sub-pipe material constituting the sub-exhaust path 13 is provided in the portion surrounding the passage hole 12 and the tongue piece 14 of the main pipe material, the sub-exhaust path 13 and the main exhaust path 11.
Joining and welding is performed so that the downstream portion 11A of the confluence portion has a substantially U shape through the confluence portion 8.

In the present embodiment, however, the exhaust gas from the one exhaust pipe line 6 linearly flows through the merging portion 8 to the merging pipe line 9. On the other hand, the exhaust gas from the other exhaust pipe line 7 is substantially inverted at the merging portion 8 and flows straight to the merging pipe line 9. In the confluence portion 8, the exhaust gas flows reversely by the guide portion 15, but is rectified by the tongue piece 14. Therefore, the exhaust gas is caused to flow substantially evenly without generating eight vortexes at the merging portion to prevent the generation of abnormal noise such as radiated sound.

Then, one of the exhaust pipe line 6 and the merging pipe line 9
Is composed of one main pipe material and the other exhaust pipe line 7
Is composed of a sub-pipe material, so that the merging portion 8 constitutes a so-called one-force supporting end. Moreover, since the length of the weld bead W is about the circumferential length of the sub-pipe material, the length of the weld bead W is longer than that of a structure in which a half-circular member having a semicircular cross section is welded and joined in the vicinity of the confluence. Is getting shorter.

Therefore, when the force for deforming the exhaust pipe lines 6 and 7 is transmitted to the exhaust pipe lines 6 and 7 due to the vibration of the V-type engine 1 and the traveling of the vehicle, the main pipe material and the sub pipe The material is less likely to receive the restraint force at the joining portion 8, is deformed as a whole, and the force acting on the main pipe material and the sub-pipe material is likely to escape. That is, the stress concentration at the merging portion 8 is reduced and the stress is dispersed.

According to the above construction, the one exhaust pipe line 6 and the one merging pipe line 9 are made of one main pipe material,
The other exhaust pipe line 7 is made of a sub-pipe material, and the sub-pipe material is welded to the main pipe material, so that the binding force at the merging portion 8 is weakened. Therefore, the main pipe material and the sub pipe material are wholly deformed, the force acting on the main pipe material and the sub pipe material escapes, the stress concentration is eliminated in the confluence portion 8, the stress is dispersed, and the occurrence of cracks can be prevented. It has been confirmed by a vibration endurance test of a single body that a durability strength five times or more that of the conventional structure can be obtained.

In short, even if stress is applied to the merging portion 8,
Since the two exhaust pipe lines 6 and 7 and the merging pipe line 9 are deformable, stress concentration can be reduced and stress can be dispersed. Further, unlike the conventional case, since a casting material is not used, the plate thickness is thin, the weight is light, and the cost can be reduced.

Further, since the two exhaust pipe lines 6 and 7 and the merging pipe line 9 are made of pipes, the plate thickness is thin and the heat capacity is smaller than that of the casting. Therefore, especially at the start of engine operation when the outside air temperature is low, such as in winter, heat is less likely to be taken by the exhaust gas merging portion 8 from the V-type engine 1, heat escape is prevented, and the temperature of the exhaust gas can be maintained high. Therefore, due to the catalyst carrier in the catalytic converter, CO components and H in the exhaust gas
Unburned components such as C component are burned by the heat of the exhaust gas, and the removal efficiency can be increased.

Further, the work of providing the tongue piece 14 forming a part of the guide portion 15 at the edge of the passage hole 12 of the main pipe material on the upstream side of the exhaust gas is simply performed after the passage hole 12 is formed in the material pipe. Since the tongue piece 14 should be crushed and welded,
It suffices to prepare the pipe material as the material and to weld the sub pipe material to the main pipe material. Moreover, since the length of the welding bead W is about the circumference of the sub pipe material, the welding work time is short and it can be easily manufactured. The manufacturing cost can be reduced.

In this embodiment, the V-type engine is used as the type of engine, but the present invention is not limited to this and can be applied to an in-line engine.
Further, in this embodiment, the tongue piece is formed by crushing the edge portion of the passage hole on the upstream side of the exhaust gas.
The tongue piece 21 may be welded to the edge of the passage hole 22 on the exhaust gas upstream side as shown in FIG. In such a case, the shape such as the length and width of the tongue piece 21 can be freely selected, and therefore, for example, the flow of exhaust gas can be freely designed to correspond to the exhaust amount.

[0042]

As described above, according to the first aspect of the present invention, one exhaust pipe line and one merging pipe line are formed of one main pipe material, and the other exhaust pipe line is a sub pipe material. Since the sub-pipe material is welded to the main pipe material, the force for restraining the deformation at the merging portion is small. Therefore, the main pipe material and the sub pipe material are wholly deformed, the force acting on the main pipe material and the sub pipe material escapes, the stress concentration disappears at the confluence portion, the stress is dispersed, and the occurrence of cracks can be prevented.

In short, even if stress is applied to the merging portion, 2
Since the two exhaust pipe lines and the merging pipe line are deformable, stress concentration can be avoided and stress can be dispersed. Further, unlike the conventional case, since a casting material is not used, the weight is light and the cost can be reduced.

Further, since the two exhaust pipe lines and the merging pipe line are made of pipes, the heat capacity is smaller than that of the casting. Therefore, especially when the engine starts operating in a low temperature of the outside air, such as in the winter, the exhaust gas from the engine is less likely to lose heat at the confluent portion, heat is prevented from escaping, and the temperature of the exhaust gas can be kept high. Therefore, the catalytic converter burns the unburned components such as CO component and HC component in the exhaust gas with the heat of the exhaust gas, and the removal efficiency can be increased.

According to the second aspect of the invention, the work of providing the tongue piece forming a part of the guide portion at the edge of the passage hole of the main pipe material on the upstream side of the exhaust gas simply involves forming the passage hole in the raw material pipe. After drilling, squeeze the tongue pieces, and weld the main pipe material to the sub pipe material. Moreover, since the welding length is about the circumference of the sub pipe material, the welding work time is short. It can be easily manufactured and the manufacturing cost can be reduced.

According to the third aspect of the invention, the tongue piece is formed by crushing the edge portion of the passage hole on the upstream side of the exhaust gas, so that the work of forming the tongue piece is simple. According to the invention described in claim 4, since the tongue piece is formed by being welded to the edge portion of the passage hole on the exhaust gas upstream side, the shape of the tongue piece can be freely selected and the flow of the exhaust gas can be changed. There is an effect that can be freely changed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an exhaust gas collecting apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing an entire exhaust gas collecting apparatus according to the embodiment.

FIG. 3 is a perspective view showing a main part of the exhaust gas collecting apparatus according to the embodiment.

4 is a view taken in the direction of the arrow X in FIG.

FIG. 5 is a cross-sectional view showing a main part of another tongue piece of the exhaust gas collecting device according to the embodiment of the present invention.

FIG. 6 is a front view showing the entire conventional exhaust collecting apparatus.

[Explanation of symbols]

 1 V-type engine (engine) 6 One exhaust pipe line 7 One exhaust pipe line 8 Confluence part 9 Confluence line 11 Main exhaust path 11A Confluence part downstream part 12 Passage hole 13 Sub exhaust path 14 Tongue piece 15 Guide part

Claims (4)

[Claims] 1. A pair of exhaust pipes provided on both sides of the engine, a confluence part having a guide part for rectifying exhaust gas, where the exhaust pipes are gathered at a position below the engine, and the confluence part is connected to the confluence part. One exhaust pipe line and a confluence pipe line that forms a linear main exhaust passage are provided, and the sub-exhaust passage formed in the other exhaust pipe line and the downstream portion of the confluence part of the main exhaust passage are connected via the confluence portion. In the exhaust gas collecting device connected in a substantially U shape, one exhaust pipe line and one merging pipe line are formed by one main pipe material, and a passage hole is formed in the main pipe material, and the passage of the main pipe material is formed. A tongue that forms a part of the guide is provided at the edge of the hole on the upstream side of the exhaust gas, and the other exhaust pipe line is made of a sub-pipe material. Characterized by joining and welding materials That exhaust collecting apparatus. 2. A main exhaust passage made of a main pipe material is connected to one side of the engine, and a sub exhaust passage made of a sub pipe material is connected to the other side of the engine, and a passage hole is formed in the main pipe material. A tongue forming a part of a guide part that rectifies the exhaust gas is provided at the edge of the passage hole of the main pipe material on the upstream side of the exhaust gas. Through U
A method for manufacturing an exhaust gas collecting apparatus, comprising: joining a sub-pipe member to a main pipe member so as to form a V shape and enclosing and welding the passage hole and the tongue piece. 3. The exhaust gas collecting apparatus according to claim 2, wherein the tongue piece is formed by crushing an exhaust gas upstream side of an edge portion of the passage hole. 4. The exhaust gas collecting device according to claim 2, wherein the tongue piece is formed by being welded to an edge of the passage hole on the upstream side of the exhaust gas.