JP2006070809A - Intake manifold and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the stiffness of an intake manifold without exacerbating the oscillation welding characteristics between the upper half body and the lower half body comprising the intake manifold. <P>SOLUTION: The extended upper part 37 and the extended lower part 29 are formed which are oscillation-welded to each other. The extended upper part is extended outside an intake air passage on the upper half body 25, and the extended lower part is extended outside the intake air passage on the lower half body 27. Then an annular connecting part 31 on the main pipe side is integrally molded to the lower half body 27. Then an upward protruding portion 31b, which is protruded upward and extended in the circumference, is provided on the outer peripheral surface of the connecting part 31 on the main pipe side. Then a reinforcing part 39, which is connected to the outer peripheral surface 31d of the upward protruding portion 31b, is integrally molded to the upper half body 25. Then a connecting surface of the reinforcing part 39 to the upward protruding portion 31b is formed so that it is extended in the oscillating direction at the time of oscillation welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a manifold intake pipe for an engine for supplying intake air to a cylinder of the engine and a method for manufacturing the same.

  Conventionally, as disclosed in, for example, Patent Document 1, a manifold intake pipe for an engine in which one main pipe portion and a plurality of branch pipe portions branched from one end of the main pipe portion are made of resin. It has been known. The manifold intake pipe of Patent Document 1 includes a one-side half that integrally forms one radial direction side of the main pipe part and one radial direction side of the branch pipe part, the other radial direction side of the main pipe part, and the diameter of the branch pipe part. It is divided into two members with the other half that integrally constitutes the other side in the direction, and the one side half and the other side are vibrated by welding both joint surfaces of these one side half and other side half The half is integrated. Thus, by joining the two halves by vibration welding, both joint surfaces can be joined easily and airtightly.

Further, in Patent Document 1, a flange-like communication portion that allows the other end of the main pipe portion to communicate with an intake pipe provided with a throttle valve is integrally formed on one side half, and the communication portion of the main pipe portion is the intake air. It is fixed to the tube. Further, the one side half is integrally formed with a communication portion for communicating each branch pipe portion with the intake port of the engine, and the communication portion of each branch pipe portion is fixed to the engine.
JP-A-9-125970 (3rd page, 4th page, FIG. 2, FIG. 3, FIG. 4)

  However, in the manifold intake pipe for an engine disclosed in Patent Document 1, since the communication part of the main pipe part is fixed to the intake pipe provided with the throttle valve, there are a plurality of branch pipe parts during the operation of the engine. Since each is fixed to the engine, the force due to vibration of the entire manifold intake pipe acts in a distributed manner in the communication part of each branch pipe part, but since there is only one main pipe part, this main pipe part The force due to the vibration of the whole manifold is concentrated and acts on the communicating part. As a result, the force due to the vibration of the entire manifold intake pipe acts more on the communicating part of the main pipe part than on the communicating part of each branch pipe part, so the communicating part of the main pipe part needs to be highly rigid.

  In addition, when the one-side half and the other-side half are vibration welded, the vibration direction is a direction perpendicular to the axis of the intake pipe, so the other half is vibration-welded to the outer surface of the flange-like communication portion. It was difficult to reduce the rigidity, and a reduction in rigidity in the vicinity of the communicating portion was inevitable.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a reinforcing portion that is vibration welded to the communicating portion of the main pipe portion in the other half, and to connect the reinforcing portion and the communicating portion. By elaborating the structure of the welded portion, the rigidity of the intake pipe is increased without hindering the integration by vibration welding between the one half and the other half.

  In order to achieve the above object, according to the first aspect of the present invention, a main pipe part and a plurality of branch pipe parts branched and extended from one end of the main pipe part are provided, and the main pipe part and the branch pipe part are the main pipe part. One side half that integrally configures one side in the radial direction and one side in the radial direction of the branch pipe part, and the other side half that integrally forms the other side in the radial direction of the main pipe part and the other side in the radial direction of the branch pipe part A manifold manifold made of resin for an engine which is divided into a body and these one half and the other half are vibration welded. The other half of the main pipe portion is externally connected to the one half An annular communication portion that communicates with the communication portion is integrally formed, and a reinforcing portion that is joined to the outer peripheral surface of the communication portion to reinforce the communication portion is integrally formed with the other half, and the communication portion of the reinforcement portion The joining surface is shaped so as to follow the vibration direction in the axial direction of the communication portion during vibration welding of the one half and the other half. Is, a structure in which the reinforcing part is vibration welded to the communicating portion.

  According to a second aspect of the invention, in the first aspect of the invention, the first branch pipe part and the second branch pipe part of the plurality of branch pipe parts extend so as to have a step, and the first branch pipe of one side half body. The joint surfaces of the first branch pipe portion of the second half and the other half body and the joint surfaces of the second branch pipe portion of the first half and the second branch pipe portion of the second half are mutually stepped. In addition, the first side half body and the other side half body are formed so as to be along the vibration direction in the axial direction of the communication portion during vibration welding.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the communicating portion of the one half is connected to a supercharger provided in the engine, and the end of the branch pipe opposite to the main pipe is the above The intake air compressed by the supercharger is connected to an intercooler that cools the intake air.

  According to a fourth aspect of the present invention, in the method of manufacturing a manifold intake pipe according to the first aspect, the joining surface formed on the open side of the one half and the joint surface formed on the open side of the other half While pressing, the joint surface of the reinforcing portion of the other half is pressed against the outer peripheral surface of the communicating portion of the one half, and the one half and the other half are placed in the axial direction of the communicating portion. By causing relative vibration, the welding surfaces formed on the open side of the one half and the other half are vibration welded, and the joint surface of the reinforcing portion is vibration welded to the outer peripheral surface of the communicating portion. The manifold is configured to obtain a manifold intake pipe in which the one half and the other half are integrated.

  According to a fifth aspect of the present invention, in the method for manufacturing a manifold intake pipe according to the second aspect, the joining surface of the reinforcing portion of the other half is pressed against the outer peripheral surface of the communicating portion of the one half, and the one half The first branch pipe part of the other half body and the first branch pipe part of the other half body are in pressure contact with each other, the second branch pipe part of the one half body and the second branch pipe part of the other half body The joint surface of the reinforcing portion is vibrated and welded to the outer peripheral surface of the communication portion by pressure-welding the joint surfaces to each other and causing the one-side half and the other half to relatively vibrate in the axial direction of the communication portion. The welded surfaces of the first branch pipe part of the one half and the first branch pipe part of the other half are vibration welded, and the second branch pipe part of the one half and the other half Both joint surfaces with the second branch pipe part of the body are vibration welded to obtain a manifold intake pipe in which the one half and the other half are integrated.

  According to the first aspect of the present invention, the joint surface of the reinforcing portion provided in the other half is connected to the communicating portion in the axial direction of the communicating portion during vibration welding of the one half and the other half. Therefore, it is possible to smoothly vibrate the one-side half and the other-side half at the time of vibration welding. Thereby, without causing any trouble in vibration welding between the one-side half and the other-side half, the joint surface of the reinforcing portion is securely welded to the outer peripheral surface of the communicating portion, and the communicating portion is reinforced by the reinforcing portion. And the communication portion can be made highly rigid.

  According to the invention of claim 2, when the first branch pipe part and the second branch pipe part are formed so as to have a step, the shape design of each branch pipe part is improved. By simply causing the half and other half to vibrate relative to each other in the axial direction of the communicating part at the time of vibration welding, both joint surfaces of each branch pipe of the one half and each branch pipe of the other half can be easily formed. Furthermore, vibration welding can be performed reliably.

  According to the invention of claim 3, since the communicating portion is highly rigid as described above, the communicating portion can be firmly connected to the supercharger, and the intake air compressed by the supercharger is supplied to the main pipe portion and It can be reliably introduced into a plurality of locations in the intercooler via the branch pipe portion.

  According to the invention of claim 4, the one side half and the other side half are relatively vibrated in the axial direction of the communicating portion, so that the joint surfaces of both half halves are vibration welded and the other half is Since the joint surface of the provided reinforcement part is vibration welded to the outer peripheral surface of the communication part, the two halves are smoothly and relatively vibrated during vibration welding so that the joint surface of the reinforcement part is securely attached to the outer peripheral surface of the communication part. Vibration welding can be performed. As a result, it is possible to easily obtain a manifold intake pipe having a highly rigid communication portion without hindering vibration welding between the one half and the other half.

  According to invention of Claim 5, when the 1st branch pipe part and the 2nd branch pipe part are formed so that it may have a level | step difference mutually, when the freedom degree of the shape design of each branch pipe part is improved, one side In addition to the effect of the above-described fourth aspect, the half body and the other half are relatively vibrated in the axial direction of the communication portion, and in addition to the effects of the above-mentioned claim 4, each branch pipe portion of the one side half body and each branch pipe portion of the other side half body It is possible to easily obtain a manifold intake pipe in which both joint surfaces are reliably welded by vibration.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a manifold intake pipe 1 for an engine according to an embodiment of the present invention. The manifold intake pipe 1 includes a main pipe portion 3 and a first branch pipe portion 5 that branches off from one end of the main pipe portion 3. And the 2nd branch pipe part 7 is comprised integrally. As shown in FIG. 2, the other end of the main pipe part 3 is connected to a discharge port (not shown) of the supercharger 11, while the main pipe part 3 of the first branch pipe part 5 and the second branch pipe part 7 Opposite ends are connected to the intercooler 13, respectively. The intake air drawn from the air cleaner 15 is compressed by the supercharger 11 and then dispersed in the intercooler 13 from the main pipe portion 3 of the manifold intake pipe 1 through the first branch pipe portion 5 and the second branch pipe portion 7. And is efficiently cooled by the intercooler 13. The intake air in the intercooler 13 flows into the intake port (not shown) of the engine 23 through the throttle body 17, the surge tank 19, and the intake manifold 21.

  The first branch pipe portion 5 of the manifold intake pipe 1 extends in a curved shape from one end of the main pipe portion 3 toward the intercooler 13, and as shown in FIGS. The end on the intercooler 13 side is bent at a substantially right angle downward. Further, the second branch pipe portion 7 extends away from the first branch pipe portion 5 in a curved shape from one end of the main pipe portion 3 toward the intercooler 13, and the second branch pipe portion 7 on the intercooler 13 side is extended. The end portion is bent downward similarly to the first branch pipe portion 5.

  Further, the axis 10 (indicated by a dot in FIG. 1) that is the center line of the main pipe 3 is located below the axis 6 (indicated by a dot in FIG. 5) of the first branch pipe 5. Furthermore, the axis 6 of the first branch pipe part 5 is located above the axis 8 (shown by a dot in FIG. 5) of the second branch pipe part 7, and these first branch pipe part 5 and second branch pipe part 5 The pipe part 7 has a level | step difference mutually. The level difference between the first branch pipe part 5 and the second branch pipe part 7 is a result of designing the first branch pipe part 5 and the second branch pipe part 7 so that they can be attached to the supercharger 11 and the intercooler 13. It is a thing.

  As shown in FIG. 3, the manifold intake pipe 1 is divided into an upper half 25 and a lower half 27 formed by injection molding resin. The lower half 27 includes a main pipe constituting part 3a constituting the lower half of the main pipe part 3 in the radial direction and a first branch pipe constituting part constituting the lower half of the first branch pipe part 5. 5a and a second branch pipe constituting part 7a constituting the lower half of the second branch pipe part 7 are integrally provided. That is, each of the main pipe part 3, the first branch pipe part 5, and the second branch pipe part 7 is divided into two vertically. And the 1st branch pipe structure part 5a of the lower half body 27 comprises the 1st branch pipe part of the 1 side half body in this invention, and the 2nd branch pipe structure part 7a is one side in this invention. The half branch pipe part 2 is constituted.

  The cross section of each of the components 3a, 5a, 7a has a substantially arc shape that opens upward, and the open side edge extends downward from the components 3a, 5a, 7a substantially horizontally. A portion 29 is formed. The upper surface of the lower extension 29 is a joint surface 29 a that is vibration welded to the upper half 25. The joint surface 29a is formed along the vibration direction (axis 4 of the main pipe side communication portion 31 described later) during the vibration welding.

  An annular main pipe side communication portion 31 for connecting the main pipe portion 3 to the supercharger 11 as the outside is integrally formed at a position corresponding to the other end of the main pipe portion 3 of the lower half body 27. The main pipe side communication portion 31 is formed to have a substantially circular cross section, the axis 4 of the main pipe side communication portion 31 extends substantially horizontally, and the axis 4 of the main pipe side communication portion 31 is the main pipe in plan view. It extends so as to intersect the axis 10 of the part 3. Therefore, the intake passage at the boundary portion between the main pipe side communication portion 31 and the main pipe portion 3 is bent in a plan view.

  The supercharger 11 side of the main pipe side communication part 31 is an insertion part 31 a that is inserted into and fixed to the discharge port of the supercharger 11. In the upper half of the outer peripheral surface of the main pipe side communication part 31 opposite to the insertion part 31a, an upper protrusion part 31b that protrudes radially outward of the main pipe side communication part 31 and extends in the circumferential direction is formed. In the half portion, there is formed a lower protruding portion 31c that protrudes radially outward of the main pipe side communication portion 31 and extends in the circumferential direction continuously to the upper protruding portion 31b. The upper protruding portion 31b and the lower protruding portion 31c are in contact with the periphery of the discharge port in a state where the insertion portion 31a is inserted into the discharge port of the supercharger 11, so that the main pipe side communication portion 31 has a predetermined length or more in the discharge port. The upper protrusion 31b and the lower protrusion 31c determine the position of the main pipe 31 relative to the supercharger 11. Further, the outer peripheral surface 31d of the upper protruding portion 31b is formed in an arcuate surface shape extending in the direction of the axis 4 of the main pipe side communication portion 31 and extending in the circumferential direction.

  Further, the lower half body 27 is integrally formed with a first branch pipe side communication portion 33 for communicating the first branch pipe portion 5 with the outside (intercooler 13). The first branch pipe side communication portion 33 has a substantially oval annular shape, and is formed so that the axis thereof is oriented substantially vertically corresponding to the bent shape of the end portion of the first branch pipe portion 5 on the intercooler 13 side. Yes. Two fastening portions 33a extending outward are formed on the outer peripheral surface of the first branch pipe side communication portion 33 so as to be separated from each other in the circumferential direction. Bolts or the like are provided in the holes 33b provided in the fastening portions 33a, respectively. By inserting (not shown), the first branch pipe side communication portion 33 is fastened and fixed to the intercooler 13.

  Further, the lower half body 27 is integrally formed with a second branch pipe side communication portion 35 for communicating the second branch pipe portion 7 with the outside (intercooler 13). The second branch pipe side communication portion 35 is formed in an annular shape in which the axis line is substantially vertical like the first branch pipe side communication portion 33, and is provided with two fastening portions 35a and a hole portion 35b. The intercooler 13 is fastened and fixed.

  On the other hand, the upper half 25 includes a main pipe constituting part 3b constituting an upper half of the other side in the radial direction of the main pipe part 3 and a first branch pipe constituting part constituting an upper half of the first branch pipe part 5. 5b and a second branch pipe constituting part 7b constituting the upper half of the second branch pipe part 7 are integrally provided. The first branch pipe constituting part 5b of the upper half 25 constitutes the first branch pipe part of the other half of the present invention, and the second branch pipe part 7b is the second branch half of the other half of the present invention. A 2-branch pipe portion is configured.

  Each of the constituent parts 3b, 5b, and 7b has a substantially arcuate cross section that opens downward, and an upper extending part 37 that extends substantially horizontally outward is formed at the open side edge part. The lower surface of the upper extending portion 37 is a bonding surface 37a that is vibration welded to the bonding surface 29a of the lower half 27, and the bonding surface 37a also extends substantially horizontally. The direction in which the upper half 25 and the lower half 27 are caused to relatively vibrate when the joint surfaces 29 a and 37 a are welded by vibration is the axial direction of the main pipe side communication portion 31.

  Further, as described above, corresponding to the step between the axis 6 of the first branch pipe part 5 and the axis 8 of the second branch pipe part 7, as shown in FIG. 5B, the first branch pipe constituting part 5a, The joining surfaces 29a, 37a of 5b and the joining surfaces 29a, 37a of the second branch pipe constituting portions 7a, 7b have a step.

  Moreover, in this embodiment, as shown in FIG. 5, the joining surfaces 29a and 37a on the second branch pipe portion 7 side in the first branch pipe portion 5 and the joining surfaces 29a and 37a on the opposite side have a step. Furthermore, the second branch pipe portion 7 has steps on the joint surfaces 29a and 37a on both sides in the same manner. By doing in this way, the freedom degree of the shape setting of each branch pipe part 5 and 7 improves further.

  A reinforcing portion 39 for reinforcing the main pipe side communication portion 31 is integrally formed at a location corresponding to the other end of the main pipe portion 3 of the upper half 25. As shown in FIG. 3, the reinforcing portion 39 has an arc shape extending along the outer peripheral surface 31d of the upper protruding portion 31b. As shown in FIG. 4A, the lower surface of the reinforcing portion 39 is a bonding surface 39a that is vibration welded to the outer peripheral surface 31d of the upper protruding portion 31b. It extends along the direction of the axis 4 of the main pipe side communication portion 31 which is the vibration direction when the lower half body 27 is vibration welded.

  Further, as shown in FIG. 3, the upper half 25 is formed with a joining plate portion 41 that is joined to the upper surfaces of the first branch pipe communication portion 33 and the second branch pipe communication portion 35 by vibration welding. .

  Further, as shown in FIG. 4, a gap 43 is formed in the direction of the axis 4 of the main pipe side communication portion 31 between the main pipe side communication portion 31 of the lower half body 27 and the main pipe constituting portion 3 b of the upper half body 25. ing. Due to the gap 43, the amplitude margin when the upper half 25 and the lower half 27 are relatively vibrated in the direction of the axis 4 of the main pipe side communication portion 31 (indicated by arrow F in FIG. 4A) during vibration welding. It is to be secured.

  Next, a manufacturing procedure of the manifold intake pipe 1 configured as described above will be described. First, the upper half 25 and the lower half 27 are set in a vibration welding apparatus (not shown). Thereafter, the joint surface 37a of the upper half 25 and the joint surface 29a of the lower half 27 are pressed against each other, the joint surface 39a of the reinforcing portion 39 is pressed against the outer peripheral surface 31d of the upper protruding portion 31b, and the upper half The joining plate portion 41 of the body 25 is pressed against the upper surfaces of the first branch pipe side communication portion 33 and the second branch pipe side communication portion 35 of the lower half body 27. Thereafter, the upper half 25 and the lower half 27 are relatively vibrated in the direction of the axis 4 of the main pipe side communication portion 31. As a result, the joint surface 37a of the upper half 25 and the joint surface 29a of the lower half 27 are vibration welded, and the reinforcing portion 39 is vibration welded to the outer peripheral surface 31d of the upper protrusion 31b. The manifold intake pipe 1 in which the part 31 is reinforced is obtained.

  Therefore, according to the manifold intake pipe 1 for an engine according to this embodiment, the vibration direction (main pipe side) at the time of vibration welding between the joint surface 39a of the reinforcing portion 39 and the outer peripheral surface 31d (joint surface) of the main pipe side communication portion 31. Since the upper half 25 and the lower half 27 are welded to each other, both the halves 25 and 27 can be smoothly and relatively vibrated. Thus, the reinforcing portion 39 is reliably vibration welded to the outer peripheral surface 31d of the upper protruding portion 31b and the main pipe side communicating portion 31 is reinforced without hindering the vibration welding between the upper half 25 and the lower half 27. It can be reinforced by the part 39, and the main pipe side communication part 31 can be made highly rigid.

  Further, since the main pipe side communication portion 31 is highly rigid as described above, the main pipe side communication portion 31 can be firmly connected to the supercharger 11, and the intake air compressed by the supercharger 11 is supplied to the main pipe portion. 3. It can be reliably introduced into a plurality of locations in the intercooler 13 via the first branch pipe portion 5 and the second branch pipe portion 7.

  In addition, when the first branch pipe 5 and the second branch pipe 7 are formed so as to extend with a step, and the degree of freedom in designing the shape of the first branch pipe 5 and the second branch pipe 7 is improved, Since both joint surfaces 29a, 37a of the first branch pipe constituent parts 5a, 5b and the second branch pipe constituent parts 7a, 7b are aligned with the four directions of the axis line of the main pipe side communication part 31 that is the vibration direction at the time of vibration welding. The joint surfaces 37a and 29a of the branch pipe portions 5b and 7b of the upper half body 25 and the branch pipe portions 5a and 7a of the lower half body 27 can be easily and reliably vibration welded.

  In addition, although this embodiment demonstrated the case where there are two branch pipe parts 5 and 7, this invention is applicable also when there are three or more branch pipe parts.

  Further, in this embodiment, the manifold intake pipe 1 is disposed between the supercharger 11 and the intercooler 13. However, the manifold intake pipe 1 can be arbitrarily arranged as long as it is between devices constituting the intake system of the engine 23. Can be placed in place.

  As described above, the manifold intake pipe according to the present invention is used, for example, to be disposed between a supercharger provided in an engine and an intercooler and to allow intake air from the supercharger to flow into the intercooler. it can.

It is a perspective view of the manifold intake pipe which concerns on embodiment. It is the schematic which shows the intake system of the engine with which the manifold intake pipe was mounted | worn. It is a disassembled perspective view of a manifold intake pipe. (A) is sectional drawing in the AA line of FIG. 1, (b) is sectional drawing in the BB line of FIG. (A) is sectional drawing in CC line of FIG. 1, (b) is sectional drawing in the DD line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manifold intake pipe 3 Main pipe part 4 Axis 5 of communication part 1st branch pipe part 7 2nd branch pipe part 11 Supercharger 13 Intercooler 23 Engine 25 Upper half (other half)
27 Lower half (one half)
29a Joint surface 31 Main pipe side communication part 37a Joint surface 39 Reinforcement part 39a Joint surface of reinforcement part

Claims (5)

A main pipe part and a plurality of branch pipe parts branched from one end of the main pipe part, and the main pipe part and the branch pipe part are arranged on one side in the radial direction of the main pipe part and one side in the radial direction of the branch pipe part. The one-side half that is integrally formed and the other half that integrally forms the other side in the radial direction of the main pipe part and the other side in the radial direction of the branch pipe part are divided into one half and the other half. It is a plastic manifold intake pipe for engines with the body vibration welded,
The one side half is integrally formed with an annular communication part that communicates the other end of the main pipe part to the outside.
The other half is integrally formed with a reinforcing part that is joined to the outer peripheral surface of the communicating part and reinforces the communicating part,
The joint surface of the reinforcing part with the communicating part is formed along the vibration direction in the axial direction of the communicating part at the time of vibration welding of the one half and the other half, and the reinforcing part vibrates to the communicating part. A manifold intake pipe characterized by being welded. In the manifold intake pipe according to claim 1,
The first branch pipe part and the second branch pipe part among the plurality of branch pipe parts extend so as to have a step,
Both joint surfaces of the first branch pipe part of the one side half and the first branch pipe part of the other side half, the second branch pipe part of the one side half and the second branch pipe part of the other side half The two joint surfaces have a step and are formed along the vibration direction in the axial direction of the communication portion at the time of vibration welding of the one half and the other half. Intake pipe. In the manifold intake pipe according to claim 1 or 2,
The communication part of one side half is connected to the supercharger provided in the engine,
A manifold intake pipe characterized in that an end portion of the branch pipe portion opposite to the main pipe portion is connected to an intercooler that cools the intake air compressed by the supercharger. In the manufacturing method of the manifold intake pipe of Claim 1,
The joint surface formed on the open side of the one half and the joint surface formed on the open side of the other half are pressed together, and the other half is placed on the outer peripheral surface of the communication portion of the one half. Pressure contact the joint surface of the reinforcement
While causing the one-side half and the other-side half to vibrate relative to each other in the axial direction of the communicating portion, the welding surfaces formed on the open side of the one-side half and the other-side half are vibrated and welded together. Manufacturing a manifold intake pipe characterized in that the joint surface of the reinforcing part is vibration welded to the outer peripheral surface of the communication part to obtain a manifold intake pipe in which the one half and the other half are integrated. Method. In the manufacturing method of the manifold intake pipe of Claim 2,
The joint surface of the reinforcement part of the other half is pressed against the outer peripheral surface of the communication part of the one half, and both the first branch pipe part of the one half and the first branch pipe part of the other half Pressure-welding the joining surface, and pressure-welding both joining surfaces of the second branch pipe part of the one half and the second branch pipe part of the other half,
By causing the one-side half and the other-side half to vibrate relative to each other in the axial direction of the communicating portion, the joint surface of the reinforcing portion is vibration welded to the outer peripheral surface of the communicating portion, and the first half of the one-side half Both joint surfaces of the branch pipe part and the first branch pipe part of the other half are vibration welded, and the second branch pipe part of the one half and the second branch pipe part of the other half A manufacturing method of a manifold intake pipe, characterized in that a manifold intake pipe is obtained by vibration welding of both joint surfaces to integrate the one-side half and the other-side half.

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