KR100812227B1 - A diverging exhaust pipe for cars and the making method thereof - Google Patents

Abstract

A method for molding a branched exhaust pipe for a vehicle and the branched exhaust pipe for the vehicle made through method thereof are provided to reduce manufacturing time and to reduce exhaust noise by bending a pipe with 'V' shape and drilling a connecting hole at a center part of the pipe. A branched exhaust pipe for a vehicle comprise a long straight pipe, long out pipes(5a,5b), a branched out pipe(2), an expanded pipe(8), a connecting hole, a front pipe member(7), an inlet(11), and an in pipe(10). A method for molding the branched exhaust pipe comprises the steps: bending the long straight pipe with 'V' shape; vertically cutting a center of projected part of the curved pipe; drilling the connecting hole from left to right at one part of the center part; and welding the front pipe member to the center of the branched out pipe.

Description

A method for forming a branched exhaust pipe for a vehicle and a branched exhaust pipe for a vehicle manufactured by the same {A diverging exhaust pipe for cars and the making method

1 is a perspective step-by-step schematic diagram for forming a branched out pipe of a branched exhaust pipe according to the present invention;

Figure 2 is an exploded perspective view of the tip pipe member and the branched out pipe is coupled in the branched exhaust pipe according to the present invention;

Figure 3 is a perspective schematic view of a state in which the in-pipe is inserted into the inlet portion of the tip pipe member in the branched exhaust pipe according to the present invention;

Figure 4 is a partial cross-sectional schematic view of the branched exhaust pipe according to the present invention (cross-sectional schematic view of the line A-A 'of Figure 3)

Figure 5 is a step-by-step schematic diagram for molding a conventional branched exhaust pipe

Figure 6 is a longitudinal cross-sectional schematic view of the inlet portion cut in the conventional branched exhaust pipe (cross-sectional schematic of the line B-B 'of Figure 5)

7 is a longitudinal cross-sectional schematic view of a portion of the conventional branched exhaust pipe in which the outlet pipe is integrally inserted into the outlet portion (cross-sectional schematic view of the line C-C 'of FIG.

              <Description of Symbols for Major Parts of Drawings>

1, 1 '. Branch type exhaust pipe 2. Branch type out pipe

3. Connecting hole 4. Center bending part

5a, 5b, 5a ', 5b'. Outpipe 6a, 6b. flange

7. Tip pipe member 8. Expansion pipe

9. Hang steps 10, 10 '. Inpipe

11, 11 '. Inlet P. Pipe

12a ', 12b'. Metal plate 13 '. Tops

14 '. Lower 15a ', 15b'. exit

16a ', 16b', 16c '. Top protrusion 17a ', 17b', 17c '. Bottom protrusion

18a ', 18b', 18c '. Groove

The present invention relates to a "Y" branch branch exhaust pipe connected between the catalytic converter and the muffler of the exhaust device of the vehicle and used for exhaust. More specifically, the "V" having a long straight pipe is protruded to one side. "B-shaped and bent in the" V "shape of the protruding one side of the pipe is vertically cut vertically to form a branched out pipe with an elliptical connecting hole in the center portion, the branched out pipe The larger diameter and shorter length of pipe is maintained in a circular state and the other side is elliptically expanded through press working to form an expansion pipe, but the other end of the expansion pipe is perforated at the center of the branched out pipe. A tip pipe member is formed to be processed into a size and shape that matches the ball, and the other end of the tip pipe member The welding hole is integrally welded in the state where the connecting hole of the branched out pipe is brought into contact with the perforated center part, and one end portion of the tip pipe member is welded with the in-pipe having a predetermined length. The present invention relates to a method for forming a branched exhaust pipe for a vehicle and a branched exhaust pipe for a vehicle manufactured through the same.

In general, the exhaust system of automobiles is an exhaust manifold in which a plurality of branch pipes connected to an engine are merged into one, and to remove harmful particulates (soot) such as particulate matter, carbon monoxide, hydrocarbons, and nitrogen oxides from the engine. It is composed of a catalytic converter and a muffler for reducing noise and discharging soot to the outside of the vehicle, wherein the exhaust manifold, the catalytic converter and the muffler are connected to each other by connecting pipes to reduce the exhaust gas from the engine. It is discharged to the outside through the muffler in the state.

The pipe connecting the catalytic converter and the muffler among the connecting pipes has a catalyst converter connected to an inpipe located at a distal end and a muffler connected to an outpipe located at an end thereof. Exhaust gas from which harmful particulates (soot) has been purified is smoothly discharged through the muffler while passing through the converter. Recently, a "Y" shaped branched exhaust pipe is installed between the catalytic converter and the two mufflers so that two mufflers are installed. The exhaust gas from the catalytic converter is bifurcated into two pieces while passing through the branched exhaust pipe so as to be discharged more smoothly through each muffler.

The conventional forming method of the branched exhaust pipe 1 ′ is manufactured through a complicated process through several steps as shown in FIG. 5. First, the metal plates 12a ′ 12b ′ positioned above and below are cut to a predetermined size. Then, the metal plates 12a 'and 12b' are press-molded to form the upper plate 13 'and the lower plate 14' which are each bent into a "Y" shape by using a conventional press apparatus, and the "Y" shaped The upper plate 13 'and the lower plate 14' are respectively welded up and down, but the inlet 11 'portion of the tip side to which the inpipe 10' is connected is divided into two ends and is discharged. Pressing the diameter larger than the outlets 15a 'and 15b' in order to achieve a balanced inflow and outflow of the exhaust gas, and an upper protrusion on the outer surfaces of the upper plate 13 'and the lower plate 14', respectively. The upper projection pieces 16a ', 16b' and 16c 'are formed by protruding the pieces 16a', 16b 'and 16c' and the lower projection pieces 17a 'and 17b' and 17c '. The lower protruding pieces 17a ', 17b' and 17c 'are welded and placed in contact with each other so that a "Y" -shaped pipe line is formed therein, and the inlet portion at the tip end has a predetermined length. Weld-attach with the in-pipe 10 'inserted and weld-out with the predetermined length of the outpipes 5a' and 5b 'respectively inserted into the outlets 15a' and 15b 'on both ends. And the branched exhaust pipe 1 'is fixed to the bottom surface of the vehicle while the branched exhaust pipe 1' is fixed to the bottom surface of the vehicle. 5b 'is connected to and mounted with a conventional muffler, respectively, and the branch type exhaust pipe 1' is installed in the vehicle.

However, the branched exhaust pipe 1 'has a very complicated overall molding process, which greatly increases the manufacturing time and manufacturing cost, and the upper plate 13' and the lower plate 14 'which are press-formed to be bent in a "Y" shape. Are welded to each other, as shown in FIGS. 6 and 7 due to the welding of the upper protrusion pieces 16a ', 16b' and 16c 'and the lower protrusion pieces 17a', 17b 'and 17c'. Deformation takes place as a whole, so that the inlet portion 11 'of the tip portion and the outlet portion 15a' and 15b 'portion of the tip portion are deformed to be elliptical rather than circular, respectively, so that the inpipe 10' and the outpipe 5a 'and 5b' are respectively deformed. ) Are not easily coupled to the inlet 11 'and outlet 15a' and 15b ', respectively, and are not precisely tightly coupled even in the fitted state, so that a small gap is generated in the coupled portion and the exhaust gas leaks. In addition, the inner circumferential surface of the engaging portion in which the upper protrusion pieces 16a ', 16b', 16c 'and the lower protrusion pieces 17a', 17b 'and 17c' are welded to each other. 6 is a recessed portion 18a ', 18b', and 18c 'recessed inward, and the exhaust gas flows into the recesses 18a', 18b ', and 18c'. As shown in FIG. 5, vortices are generated to reduce the flow of exhaust gas as well as increase exhaust noise.

The present invention is to solve the problems as described above, not perforated by welding the top plate and the bottom plate of a metal material, but the perforations and ends of the end portion of the branched out pipe bent to the "V" shape bent By welding and attaching the pipe member, the branched exhaust pipe of “Y” shape is manufactured and manufactured in a short time by a simple process, and the welded part is greatly reduced, so that there is almost no heat deformation and the inlet part of the end pipe member is circular without heat deformation. The purpose is to provide a branched exhaust pipe that is easily and precisely coupled to the in-pipe and maintains the same, so that there is no leakage of exhaust gas, and long straight grooves are not formed on the inner circumference so that no vortex occurs and exhaust noise is reduced. There is this.

In order to achieve this purpose, the long straight pipe is bent into a "V" shape with a central portion protruding to one side, and the center part is cut vertically by vertically cutting the protruding one middle part of the pipe bent to a "V" shape. To form a branched out pipe with an elliptical connecting hole in the pipe, one side of the pipe having a diameter larger and shorter than the branched out pipe is kept in a circular state, and the other side is elliptical through the press processing to expand the pipe. The other end of the expansion pipe is formed to form a front end pipe member to be processed into a size and shape corresponding to the connection hole punched in the center portion of the branched out pipe, the branched out pipe at the other end of the end pipe member The tip wave is integrally welded in a state where the connection hole is brought into contact with the centered portion. One feature of the present invention is that the inlet portion of the if member is completed by welding with an in-pipe of a predetermined length inserted.

The present invention relates to a "Y" shaped branched exhaust pipe connected between a catalytic converter and two mufflers of an automobile exhaust system and used for exhaust gas. An inpipe located at the distal end of the branched exhaust pipe includes: A conventional muffler is connected and mounted, and each outpipe divided into two ends is equipped with a conventional muffler. Each exhaust pipe is purged of harmful particulates (soot) through the catalytic converter. Is divided into both sides in the branched exhaust pipe and is smoothly discharged through each muffler.

Hereinafter, the method of forming a branched exhaust pipe for a vehicle as described above will be described in detail by each step as follows.

1. Forming step of the branched out pipe (2)

As shown in FIGS. 1 to 4, the branched out pipe 2 is divided into two outpipes while the exhaust gas flowing from the inpipe 10 located at the tip side of the branched exhaust pipe 1 is bifurcated. It is divided into 5a) and 5b so as to be discharged. As shown in FIG. 1, a long straight pipe P made of a metal material is bent around a center portion with a conventional bending machine to form a "V". Branch formed by bending in the shape of a "V" shape of the protruding one side of the pipe (P) is bent in the vertical shape up and down vertically and branched with a long oval connecting hole (3) in the left and right direction on one side of the center portion The mold out pipe 2 is formed.

The branched out pipe 2 has a center bent portion 4 formed at the other side of the center portion bent in a “V” shape, and the center bent portion 4 is formed at the left and right sides at a branch point, respectively. The outpipes 5a and 5b long in the diagonal direction are formed integrally, and the connecting holes 3 drilled on one side of the center portion are welded together integrally in a state in which the tip pipe member 7 is coupled. have.

As described above, long out pipes 5a and 5b having a predetermined length are integrally formed on both the left and right sides of the branched out pipe 2, so that it is not necessary to weld and attach a separate out pipe as in the prior art. It is composed of a structure and the work can be easily done in a short time.

On the other hand, the outpipe (5a) (5b), as shown in Figure 3, the normal flange (6a) (6b) is welded to each end as needed, so that the conventional muffler is easily coupled and mounted have.

2. Forming step of the tip pipe member 7

As shown in FIGS. 1 to 4, the tip pipe member 7 is configured such that an in-pipe 10 connected to a conventional catalytic converter is welded to one side, and a branched out pipe 2 is integrally welded to the other side. It is attached to smoothly transfer the exhaust gas from the catalytic converter to the branched out pipe (2), the diameter (ø ₁ ) of the branched out pipe (2) as shown in FIG. ₂ ) the large and short length of the round metal pipe is to maintain the circular state as it is and the other side is expanded into a long oval in the left and right direction through the press processing to form an expansion part (8), the expansion part ( 8) is formed into a tapered shape in which the left and right are getting wider and the upper and lower are gradually narrowed toward the other end, and the other end of the expansion part 8 is formed with a connection hole 3 drilled at the center of the branched out pipe 2; part It is formed in a size and shape, and the outer end surface of the other end of the expansion pipe 8 is expanded again by secondary press processing, and the center part of the branched out pipe 2 inside (the hole where the connection hole 3 is drilled). It forms the locking end 9 which can be inserted.

The expansion pipe (8) is formed in a tapered shape in which the left and right are getting wider and the upper and lower are gradually narrowed toward the other end, so that a large diameter pipe connected to one inlet portion (11) of the tip pipe member (7) 10. The exhaust gas from 10) naturally spreads to the left and right sides while passing through the tapered expansion pipe 8, so that the outpipes 5a on both the left and right sides having small diameters without bottlenecks or backflows. Each of them is divided into 5b and supplied.

3. Joining and welding completion step

As shown in FIG. 3, the center portion of the branched out pipe 2 is drilled and inserted into the engaging end 9 formed at the other end of the tip pipe member 7. In the state, the combined outer peripheral surface is welded and fixedly integrally attached, and one side inlet portion 11 of the tip pipe member 7 has a predetermined length of inpipe 10 having an outer diameter equal to the inner diameter of the inlet portion 11. ) Is welded in the state inserted into the inside to complete the branched exhaust pipe 1 processed into the "Y" shape.

Hereinafter, the action according to the present invention is as follows.

As described above, the branched exhaust pipe (1) manufactured in the "Y" shape through the combination of the branched out pipe forming step, the end pipe member forming step, and the welding completion step is generally used for the inpipe 10 located at the distal end. A conventional muffler is connected to each of the outpipes 5a and 5b on the left and right sides of the catalytic converter connected to each other and the exhaust gas in which harmful particulates (soot) from the catalytic converter is purified is introduced. While passing through (1), the center bent portion (4) formed in the center portion of the branched out pipe (2) is divided into two branches to be discharged to the respective mufflers through the out pipes (5a) (5b) on both left and right sides. As shown in FIG. 4, the expansion part 8 is tapered in gradually extending to the left and right sides, and the connection hole 3 of the branched out pipe 2 is drilled inside the locking end 9. Centered part It is welded in a combined state so that the exhaust gas is smoothly discharged to each of the outpipes 5a and 5b without naturally hitting or engaging the coupling portion, and is discharged smoothly to the respective outpipes 5a and 5b. And only the portion where the branched out pipe 2 is coupled is welded and there is almost no thermal deformation of the whole branched exhaust pipe 1, and the inlet portion 11 of the tip pipe member 7 remains in a circular state without deformation. It is possible to maintain the inpipe (10) when the coupling is not a small gap is generated in the coupling portion is the exhaust gas does not leak through the coupling portion.

As described above, according to the present invention, the upper and lower plates of metal material are press-molded, and the long straight pipe is bent into a "V" shape instead of the entire welded side circumference, and then the center portion is cut to perforate the connection hole. By welding and attaching the end pipe member, it is possible to mold and manufacture the branched exhaust pipe of the “Y” shape in a short time by a simple process. The welded part is greatly reduced, so that there is no overall heat deformation and the inlet part of the end pipe member is circular. It keeps its state as it is, and it is easily and precisely coupled to the in-pipe, so that there is no leakage of exhaust gas, and the tapered portion of the tip pipe member gradually widens to the left and right sides, and a branched out pipe inside the locking end. Of the exhaust hole is tapered by welding Expansion along the tube naturally As you spread divided into two categories, each divided in bottlenecks or reverse the symptoms without the large diameter pipe to crowd out the right and left sides of the small diameter pipe there is an effect that the exhaust gas can be made smooth.

Claims (5)

In the method of forming a "Y" branched exhaust pipe connected between the catalytic converter and two mufflers among the exhaust devices of a vehicle, the long straight pipe (P) protrudes to one side. “Bending in the shape of a shape and cutting the middle part of the protruding one side of the pipe (P) formed in the“ V ”shape up and down vertically so that the long oval connecting hole 3 in the left and right direction is perforated on one side of the center part. A branched out pipe 2 is formed so that the long out pipes 5a and 5b in a diagonal direction are integrally formed on the left and right sides with the center bent portion 4 on the other side as a branch point, and the branched out pipe 2 is formed. The larger diameter and shorter length of the pipe) is maintained in a circular state on one side, and the other side forms an enlarged enlarged part 8 extending into an oval shape long in the left and right direction through press working, but the other end of the expanded part 8 is formed. A tip pipe member 7 is formed in the center of the branched out pipe 2 so as to be machined to a size and a shape corresponding to the connection hole 3 perforated, and branched to the other end of the tip pipe member 7. In the state in which the connecting hole 3 of the mold-out pipe 2 is in contact with the perforated center portion, the welded body is integrally welded and the in-pipe 10 is inserted into the one inlet 11 portion of the tip pipe member 7. A method of forming branched exhaust pipes for automobiles, characterized in that a branched exhaust pipe (1) having a "Y" shape is completed by welding in one state. According to claim 1, wherein the expansion portion 8 is expanded to the other end of the outer peripheral surface again by the second press processing by inserting the center portion is inserted into the center portion of the connection hole (3) of the branched out pipe (2) Forming method of the branch exhaust pipe for cars, characterized in that the locking end (9) is formed. 3. The diameter according to claim 1 or 2, wherein the enlarged pipe portion 8 is formed in a tapered shape in which the left and right sides are wider and the upper and lower edges become narrower gradually toward the other end and are connected to one side of the tip pipe member 7. A branch for an automobile characterized in that the exhaust gas from the large inpipe 10 passes through the tapered expansion pipe 8 and naturally spreads to the outpipes 5a and 5b on both sides of small diameter. Molding method of mold pipe. In the "Y" branch branch exhaust pipe connected between the catalytic converter and two mufflers of the exhaust system of the automobile and used for exhaust, a "V" shape with a long straight pipe (P) protruding toward one side of the center The elliptical connecting hole (3) is formed in the left and right direction at the center of one side of the central part of the pipe (P) by vertically cutting the protruding one side of the pipe (P) bent to the "V" shape and vertically A branched out pipe 2 in which diagonally long outpipes 5a and 5b are integrally formed on the left and right sides at the branching points 4 and the branched outpipe 2 are respectively larger in diameter. A large and short length of pipe has one inlet portion 11 in a circular state and the other side is formed with an enlarged enlarged part 8 extending in a long oval shape in the left and right direction, and the other end of the expanded part 8 is branched out. Middle of pipe (2) It has a size and shape consistent with the connecting hole (3) perforated in the portion and the engaging end (9) is integrally formed on the outer peripheral surface of the other end of the expansion pipe (8) to connect the branched out pipe (2) The end pipe member 7 which is to be welded and integrally welded in a state where the hole 3 is perforated and inserted is inserted into the one end portion 11 of the end pipe member 7. Branch type exhaust pipe for cars, characterized in that consisting of a predetermined length of the in-pipe (10) to be welded. 5. The in-pipe of claim 4, wherein the enlarged pipe portion 8 is formed in a tapered shape in which the left and right are gradually wider and the upper and lower are gradually narrowed toward the other end, so that a large diameter pipe connected to one side of the tip pipe member 7 is provided. The exhaust gas from (10) naturally spreads to the left and right sides as it passes through the tapered expansion pipe (8), and is separately supplied to the outpipes (5a) and (5b) on the left and right sides, each of which is small in diameter, without bottleneck or backflow. Branched exhaust pipe for cars, characterized in that.

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