JP5357293B2 - Intake manifold for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the rigidity when a resonator body member 14 is subjected to vibration welding. <P>SOLUTION: A resonator part 6 is formed in the space 26 formed between the resonator body member 14, which is stuck to the outside surface of an intake manifold body part 15, and the outside surface of the intake manifold body part 15. Frame-like continuous projection pieces are formed on the outside surface being the curved outside of a second body member 13 and the resonator body member 14 is bonded to the frame-like continued projection pieces by vibration welding. Since frame-like projection pieces extend to traverse a plurality of branch parts 3 on the downstream side of the branch part, the rigidity becomes so high that vibration welding can be performed. The resonator part 6 has a resonator neck part 30 and is communicated with the inside of a collector part 5 through a single communicative hole 27. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to an intake manifold for an internal combustion engine.

  2. Description of the Related Art As an intake manifold for an automobile engine, one having a surge tank and a plurality of branch pipes connected to the surge tank and supplying air to each cylinder of the engine is widely known.

  Patent Document 1 discloses a configuration in which such an intake manifold is further provided with a resonator for the purpose of reducing intake noise.

  In the intake manifold in Patent Document 1, a plurality of individual pipes for distributing intake air to each cylinder and a resonance chamber to which these individual pipes are connected are formed by vibration welding the upper shell and the lower shell. . The upper shell is provided with a plurality of openings, a cover is fixed to the upper shell by vibration welding so as to cover these openings, and the resonance chamber is formed between the upper shell and the cover by the opening. A communicating reflection chamber (resonator chamber) is formed.

JP 2003-139001 A

However, in such an intake manifold of Patent Document 1, the cover, the entire outer peripheral edge thereof is positioned above the hollow resonance container or resonance chamber, when the vibration welding, the resonance container side It is difficult to ensure sufficient rigidity. Therefore, for example, it is necessary to support the upper shell with some jig from the inside during vibration welding of the cover, and it is difficult to perform vibration welding of the cover after welding the upper shell and the lower shell. There are concerns that constraints may arise.

Therefore, the intake manifold of the internal combustion engine in the present invention is
A plurality of branch portions for distributing intake air to each cylinder are connected in parallel to the collector unit, the branch portions adjacent are connected by a connecting wall Rutotomoni, synthetic resin in which the plurality of branch portions is curved to one overall An intake manifold main body ,
A Helmholtz type resonator formed by vibration welding a resonator body member made of synthetic resin having a substantially rectangular dish shape on the outer surface of the intake manifold main body that is outside the curve ;
An intake manifold for an internal combustion engine comprising :
The intake manifold main body includes a first main body member that constitutes a portion that is the inner side of the curve of the branch portion, and a second main body member that constitutes a portion that is the outer side of the curve. Formed by vibration welding to each other along,
A projecting piece that is vibration welded to the outer peripheral wall of the resonator body member is continuously formed in a frame shape corresponding to the outer shape of the resonator body member on the outer surface that is the outside of the curve of the second body member,
One end edge portion on the upstream side of the branch portion of the projecting piece having a continuous frame shape extends along the longitudinal direction of the collector portion on the outer surface of the collector portion, The other edge portion extends on the plurality of branch portions and the connecting wall therebetween so as to cross the plurality of branch portions,
A resonator volume chamber formed between the resonator body member and the intake manifold main body portion communicates with the inside of the collector portion through a single communication hole formed in the collector portion. It is a feature.

In the above configuration, the intake manifold main body having a curved shape has a structure in which the first main body member and the second main body member are vibration welded along the side edges of the branch portions. Side edge rigidity is relatively high. The frame-like projecting piece to which the resonator body member is vibration welded is located on the outer surface of the collector part in the upstream part of the branch part, but crosses a plurality of branch parts in the downstream part of the branch part. It extends like so. In other words, the resonator body member is not entirely located on the collector part, but has a shape that extends to the downstream side of the branch part. Therefore, when the resonator body member is vibration welded, the pressure applied for vibration welding is reliably supported by the rigidity of the plurality of branch portions, and there is no need for holding by the welding jig.

In one embodiment, the other edge portion has a linear shape along the longitudinal direction of the collector portion.
In a preferred aspect of the present invention, an outermost branch in which a side edge portion connecting the one end edge portion and the other end edge portion serves as a vibration welded portion of the first and second body members. It extends along the part side edge. As described above, the branch part side edge has high rigidity as a vibration welded part. Therefore, in this case, when the resonator body member is subjected to vibration welding, high rigidity is obtained even in the side edge portion, and vibration welding is surely and easily performed.
Further, in a preferred aspect of the present invention, a resonator neck wall is formed to project from the intake manifold main body in a region surrounded by the frame-shaped projecting piece.
The tip of the resonator neck wall is vibration welded to the resonator body member to form a resonator neck portion passage from the communication hole to the resonator volume chamber,
The resonator neck wall extends downstream of the branch part along one of the branch part side edges serving as the vibration welded part of the first and second main body members.
Since the side edge of the branch part has high rigidity as a vibration welded part, vibration welding between the resonator neck wall and the resonator body member along this becomes reliable and easy, and the resonator body member itself is also supported by the resonator neck wall. The rigidity is improved.
In a specific embodiment, the communication hole opens at a position corresponding to any one of the branch portions, and the resonator neck wall extends downstream of the branch portion along the side edge of the branch portion. Yes.
Alternatively, in another example, the resonator neck wall extends from the opening edge of the communication hole along the longitudinal direction of the collector part, and extends to the downstream side of the branch part along one of the branch part side edges. It forms a resonator-shaped neck passage that is bent into a letter shape.

According to the present invention, a part of the frame-shaped protruding piece corresponding to the outer peripheral wall of the resonator body member, that is, the edge portion on the downstream side of the branch part extends so as to cross a plurality of highly rigid branch parts. The rigidity required for the vibration welding of the resonator body member is obtained, and the vibration welding is surely and easily performed.

The perspective view of the intake manifold of the internal combustion engine which concerns on this invention. The disassembled perspective view of the intake manifold of the internal combustion engine in 1st Embodiment of this invention. FIG. 3 is a cross-sectional view of a main part of the intake manifold of the internal combustion engine in the first embodiment of the present invention. The principal part perspective view of the intake manifold of the internal combustion engine in 1st Embodiment of this invention. The perspective view which looked at the resonator body member in 1st Embodiment of this invention from the back surface. FIG. 3 is a cross-sectional view of a main part of the intake manifold of the internal combustion engine in the first embodiment of the present invention. The principal part sectional drawing of the intake manifold of the internal combustion engine in 2nd Embodiment of this invention. The principal part perspective view of the intake manifold of the internal combustion engine in 3rd Embodiment of this invention. The perspective view which looked at the resonator body member in 3rd Embodiment of this invention from the back surface.

  An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1-6 has shown the intake manifold in 1st Embodiment of this invention. The first embodiment is applied to an in-line three-cylinder internal combustion engine.

  As shown in FIG. 1, a resin intake manifold 1 includes three branch portions 2, 3, 4 that distribute intake air to each cylinder, and a collector located on the intake upstream side of each branch portion 2, 3, 4. And a resonator unit 6 communicating with the collector unit 5. Each branch part 2, 3, 4 is connected to the collector part 5 in parallel and is connected to adjacent branch parts by connecting walls 7, 8. In the intake manifold 1, intake air is introduced from an intake air inlet 9 located on the upstream side of the collector portion 5. In FIG. 1, 10 is an upstream flange connected to an intake duct (not shown), 11 is formed continuously at the intake downstream end of each branch part 2, 3, 4 and the cylinder head (not shown) These are downstream flanges to be fastened, and are formed on the first main body member 12 to be described later.

  As shown in the exploded perspective view of FIG. 2, the intake manifold 1 is generally composed of a first body member 12, a second body member 13, and a substantially rectangular and dish-shaped resonator body member 14. The member 12 and the second main body member 13 form an intake manifold main body portion 15 having the collector portion 5 and the branch portions 2, 3, 4. The second main body member 13 and the resonator body member 14 form the resonator portion 6. Is formed.

  The first main body member 12 and the second main body member 13 are basically divided surfaces along the curved shape of the respective branch portions 2, 3, 4, specifically, the branch portions 2, 3, 4 are connected. Further, they are divided from each other on a dividing plane extending in a direction along the row of the branch portions 2, 3, 4.

  The first body member 12 integrally includes the upstream flange 10 and the downstream flange 11 and includes most of the collector portion 5. Further, as shown in FIG. 3, each branch portion 2 is divided into two substantially along the center line of each branch passage 16, 17, 18 formed inside each branch portion 2, 3, 4 respectively. 3, 4 are halved. That is, the dividing surfaces of the branch portions 2, 3, 4, that is, the joint surfaces of the first body member 12 and the second body member 13 in the branch portions 2, 3, 4 are It is set along a substantially center line. Further, the connecting walls 7 and 8 are also substantially divided into two by the first main body member 12 and the second main body member 13.

  A portion of each branch part 2, 3, 4 on the first main body member 12 side is called a first branch half part 2A, 3A, 4A. The part on the one body member 12 side is referred to as first connection wall halves 7A and 8A. The collector portion 5 has a structure in which the upper surface is opened in a rectangular or oval shape. A portion of the collector portion 5 on the first body member 12 side is referred to as a first collector portion 5A. As shown in FIG. 2, three first branch halves 2A, 3A, and 4A are continuous with the side of the opening surface of the first collector 5A. That is, when the first main body member 12 is viewed as a whole, the collector body 5 and the three branch parts 2, 3, 4 have a shape in which one opening part is provided continuously. Yes.

  The second body member 13 basically has a shape that covers the one opening from above. That is, as shown in FIGS. 2 and 3, the second collector portion 5B that covers the upper surface opening of the first collector portion 5A and forms a part of the collector portion 5, and the branch portions 2, 3, and 4 are divided in half. Second branch halves 2B, 3B, and 4B, and second connection wall halves 7B and 8B that are parts of the connection walls 7 and 8 divided into two on the second body member 13 side. Yes.

  On the outer peripheral edge of the opening of the first main body member 12 described above, a first joint flange 19 is provided with a substantially constant width, and along the substantially center of the width of the first joint flange 19, The 1st protrusion piece 20 used as a strip | belt-shaped joining surface is protrudingly formed. The first projecting piece 20 is formed as a continuous ridge over the entire circumference of the opening of the first collector 5A and the first branch halves 2A, 3A, 4A. The surface becomes a joint surface to be vibration welded. In addition, the part located between adjacent flange parts among the 1st joining flange parts 19 becomes 1st connection wall half part 7A, 8A. That is, the first connecting wall halves 7 </ b> A and 8 </ b> A are configured by the first joint flange 19.

  Similarly, the outer peripheral edge of the second main body member 13 is provided with a second joint flange portion 21 with a substantially constant width, and along the substantially center of the width of the second joint flange portion 21, The 2nd protrusion piece 22 used as a joining surface is formed. The second protruding piece 22 is provided around the second collector portion 5B and the second branch half portions 2B, 3B, and 4B so as to be joined to the first protruding piece 20 over the entire length of the first protruding piece 20. It is formed as one continuous protrusion, and its top surface becomes a joint surface to be vibration welded. In addition, the part located between adjacent flange parts among the 2nd joining flange parts 21 becomes 2nd connection wall half part 7B, 8B. That is, the second connecting wall halves 7B and 8B are configured by the second joining flange portion 21.

  And the 1st main body member 12 and the 2nd main body member 13 face the 1st protrusion piece 20 of the 1st main body member 12, and the 2nd protrusion piece 22 of the 2nd main body member 13 applying appropriate pressure. Joined by vibration welding.

  Further, since the branch portions 2, 3, and 4 are respectively formed with branch passages 16, 17, and 18, respectively, the branch portions 2, 3, and 4 are relatively thicker than the thickness of the connecting walls 7 and 8, and the intake manifold main body portion The outer surface of 15 is formed in a wave shape with the portions of the branch portions 2, 3, 4 as peaks and the portions of the connecting walls 7, 8 as valleys.

As shown in FIGS. 2 to 5, the second main body member 13 and the resonator body member 14 include a third projecting piece 23 formed on the surface of the second main body member 13 serving as the outer surface of the intake manifold main body portion 15. The fourth projecting piece 25 continuously formed over the entire circumference of the resonator body member 14 is joined to the outer peripheral wall 24 of the resonator body member 14 by abutting them while applying an appropriate pressure and vibration welding. ing. A space 26 sealed from the outside is formed between the outer surface of the second main body member 13 and the resonator body member 14. The space 26 communicates with the inside of the collector portion 5 through a communication hole 27 formed in the second main body member 13.
As is apparent from FIGS. 2 and 4, the third projecting piece 23 is continuously formed in a substantially rectangular frame shape corresponding to the outer shape of the resonator body member 14. And one edge part 23A which becomes the branch part upstream side in the protrusion piece 23 continued in this frame shape is extended along the longitudinal direction of the collector part 5 on the outer surface of the collector part 5. The other edge portion 23B, which becomes the downstream portion of the branch portion, is formed on the three branch portions 2, 3, 4 on the three branch portions 2, 3, 4 and the connecting walls 7, 8 therebetween. It extends across. The downstream edge portion 23 </ b> B has a linear shape along the longitudinal direction of the collector portion 5. Further, the two side edge portions 23C and 23D connecting the end edge portion 23A and the end edge portion 23B are respectively branched along the outer side edges of the branch portion 2 and the branch portion 4 (see FIG. 3). It extends to the downstream side.

  The resonator unit 6 constituted by the second main body member 13 and the resonator body member 14 corresponds to a so-called Helmholtz type resonator, and is connected to the resonator body member 14 and the outer surface of the second main body member 13. A resonator neck portion 30 having an elongated resonator neck passage 29 formed between a pair of opposing resonator neck walls 28, 28, and a resonator volume chamber 31 communicating with the collector portion 5 through the resonator neck passage 29. And is formed in the space 26.

  As shown in FIG. 6, the resonator neck portion passage 29 is formed so that the communication hole 27 is positioned at one end, one end communicates with the inside of the collector portion 5, and the other end opens into the resonator volume chamber 31. The resonator neck portion 30 is formed on the central branch portion 3 of the three branch portions 2, 3, and 4 and extends along the branch portion 3. The cross-sectional area and length of the resonator neck passage 29 and the volume of the resonator volume chamber 31 are appropriately set according to the resonance frequency of the resonator section 6. The various dimensions of the resonator body member 14 are appropriately changed according to the resonance frequency required for the resonator section 6, but the outer surface thereof is corrugated like the outer surface of the intake manifold main body section 15. The first embodiment is formed so as to have a relatively smooth surface so that the appearance can be improved.

Each of the resonator neck walls 28, 28 is formed by abutting a main body side wall portion 32 protruding from the outer surface of the second main body member 13 and a resonator side wall portion 33 protruding from the resonator body member 14 while applying appropriate pressure. It is formed by joining the front-end | tip of this by vibration welding. More specifically, a concave groove 34 is formed at the front end of the main body side wall 32 over the entire length in the longitudinal direction of the main body side wall 32, and a fifth protruding piece 35 that protrudes from the front end of the resonator side wall 33. The resonator neck wall 28 is formed by abutting the bottom wall 34a of the concave groove 34 while applying an appropriate pressure, and joining the tips of both by vibration welding. The pair of resonator neck walls 28, 28 extend along the side edges of the central branch portion 3, as is apparent from FIGS. 2 and 3.

  The resonator neck wall 28 has a width of a portion to be vibration welded, that is, a width of a joint portion between the fifth projecting piece 35 and the bottom wall 34a of the groove 34, so that the third projecting piece 23 of the second main body member 13 has a width. And the width of the joint portion between the resonator body member 14 and the fourth projecting piece 25 is set to be smaller. In other words, the width of the fifth protruding piece 35 is set to be smaller than the widths of the second protruding piece 22 and the third protruding piece 23.

  In such a first embodiment, the resonator body member 14 is connected to a pair of resonator neck walls 28, 28 that form a resonator neck 30, and the resonator neck walls 28, 28 are intermediate to the resonator body member 14. Thus, the rigidity of the resonator body member 14 can be improved without increasing the thickness of the resonator body member 14. That is, the rigidity of the resonator body member 14 can be relatively improved without increasing the weight of the resonator body member 14.

  Since the resonator neck portion 30 is located on the peak portion of the outer surface of the branch portion 3, the cross-sectional area of the resonator neck portion 30 can be easily reduced, particularly when the resonance frequency is set to a low frequency. It will be advantageous.

  Further, pressure is equally applied to the resonator neck wall 28 located in the space 26 from the resonator volume chamber 31 side and the resonator neck passage 29 side. On the other hand, atmospheric pressure acts on the outer peripheral wall 24 of the resonator body member 14 connected to the outer surface of the intake manifold main body 15 from outside, and pressure in the space 26 different from atmospheric pressure acts from the inside. Therefore, a stress larger than the stress acting on the resonator neck wall 28 acts due to the pressure difference. In other words, the stress acting on the resonator neck wall 28 is smaller than the stress acting on the outer peripheral wall 24 of the resonator body member 14, and therefore the portion (intake) that is vibration welded in the resonator neck wall 28 located in the space 26. The stress acting on the body side wall portion 32 of the manifold body portion 15 and the resonator side wall portion 33 of the resonator body member 14 is vibration welded to the intake manifold body portion 15 and the outer peripheral wall 24 of the resonator body member 14. The stress is smaller than the stress acting on the portion (the joined portion between the third projecting piece 23 of the second main body member 13 and the fourth projecting piece 25 of the resonator body member 14).

Therefore, in the resonator neck walls 28, the width of the part amount that will be vibration welding (connecting portion between the resonator side wall portion 33 of the body sidewall portion 32 and the resonator body member 14) of the intake manifold body portion 15 and the resonator body member 14 It can be set to be smaller than the width of the portion where the outer peripheral wall 24 is vibration welded (the joint portion between the third protruding piece 23 of the second main body member 13 and the fourth protruding piece 25 of the resonator body member 14). . That is, the vibration welded portion of the resonator neck wall 28 can be reduced in size, and the pressure (load) required for vibration welding the tip of the main body side wall 32 and the tip of the resonator side wall 33 is determined by the resonator. Since it is supplemented by the shape rigidity of the outer surfaces of the body member 14 and the intake manifold main body 15, there is no need for holding by a welding jig. Therefore, it is not necessary to set the welding flange necessary for holding by the welding jig in the intake manifold main body 15 and the resonator body member 14, and the weight can be reduced by that amount. It is possible to improve the degree of freedom of design with respect to performance. Further, since the welding flange is not required, the volume of the resonator volume chamber 31 can be increased, and a resonator having a lower frequency range can be formed.

  The resonator neck portion 30 and the resonator volume chamber 31 of the resonator portion 6 are formed using the outer wall surface of the intake manifold main body portion 15. That is, it is possible to reduce the proportion of the wall surface that constitutes only the resonator unit 6, and overall, the intake manifold 1 can be reduced in size and weight.

  Further, in the first embodiment, the wave shape of the surface of the intake manifold main body 15 is covered by the resonator body member 14 having a relatively smooth outer surface, so that the appearance of the intake manifold 1 is improved in appearance. It is possible to improve the quality of the engine room.

  Hereinafter, although other embodiment of this invention is described, the same code | symbol is attached | subjected to the component same as 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  The intake manifold 41 according to the second embodiment of the present invention will be described with reference to FIG. The intake manifold 41 in the second embodiment has substantially the same configuration as the intake manifold 1 in the first embodiment described above, but the resonator neck 30 is adjacent to the communication hole 27 and the intake manifold main body 15 side ( A partition wall 42 protruding from the intake manifold main body 15 from the lower side in FIG. 7 toward the resonator body member 14 side (upper side in FIG. 7), and located on the other end side of the resonator neck portion passage 29 from the partition wall 42. A partition wall 43 that protrudes from the resonator body member 14 toward the intake manifold main body 15 side (lower side in FIG. 7) from the resonator body member 14 side (upper side in FIG. 7) is provided.

  These partition walls 42 and 43 are provided so that the length of the resonator neck portion passage 29 is longer than the length of the resonator neck portion 30. In the second embodiment, the resonator neck portion passage 29 is provided. However, as shown by a broken line P in FIG. In other words, the divider neck 42 protruding from the outer surface of the second main body member 13 and the divider wall 43 protruding from the inner wall surface of the resonator body member 14 form a so-called labyrinth for the resonator neck passage 29 in the resonator neck 30. It has a structure.

  In a Helmholtz type resonator, the resonator volume chamber needs to be small to stabilize the pressure in the intake manifold at an early stage, and the passage cross-sectional area of the resonator neck needs to be small to avoid deterioration of intake manifold intake distribution. Therefore, it is common to tune the resonance frequency of the resonator by increasing the length of the resonator neck, that is, the length of the resonator neck passage provided in the resonator neck. In order to secure the size, a complicated layout configuration is required.

  However, in the second embodiment, since the length of the resonator neck passage 29 in the resonator neck 30 can be changed (longened) without changing the length of the resonator neck 30 itself, the resonator 6 It is possible to set the resonator neck 30 without taking a relatively complicated layout configuration according to the resonance frequency required for the resonator, and it is possible to make the resonator unit 6 compact. That is, it is possible to improve the design freedom of the resonator unit 6 and thus the intake manifold 41.

  The number of partition walls provided in the second main body member 13 and the resonator body member 14 is not limited to one each as in the second embodiment, but the second main body member 13 and the resonator body. It is also possible to provide a plurality of partition walls on each member 14. When a plurality of partition walls are provided, it is necessary to alternately provide the second main body 13 side and the resonator body member 14 side along the resonator neck passage 29, and the total number of partition walls is either an even number or an odd number. It may be sufficient if it forms a meandering flow in the resonator neck passage 29. Further, only one partition wall may be provided on either the second main body member 13 or the resonator body member 14, or the resonator neck passage 29 may be provided. Further, only one partition wall may be provided on either the second main body member 13 or the resonator body member 14.

  Furthermore, when a partition wall is provided in the resonator neck 30 and the length of the resonator neck passage 29 is increased without changing the length of the resonator neck 30 itself, the resonator partition wall 42 and the partition wall 43 of the resonator neck passage 29 are used. In the section where the passage is meandering, in other words, in the second embodiment, the section S from the communication hole 27 to the passage cross section A constituted by the distal end of the partition wall 43 and the second main body member 13 is substantially equal to the section S. By making the sectional area of the passage constant, the passage length of the section S can be set to be the longest, and the passage length of the resonator neck 30 can be maximized as a whole. Here, when the flow (for example, air) in the section S is considered, the substantial passage cross-sectional area of the section S excludes a portion that actually becomes a so-called dead space and hardly generates a flow. It is the passage cross-sectional area of the remaining part.

Next, an intake manifold 51 according to a third embodiment of the present invention will be described with reference to FIGS. The intake manifold 51 in the third embodiment has substantially the same configuration as the intake manifold 1 in the above-described first embodiment, but most of the resonator neck passage 29 is formed between the resonator body member 14 and the intake manifold main body 15. It is formed between a resonator neck wall 28 connected to the outer surface, and a wall surface constituted by the outer peripheral wall 24 of the resonator body member 14 and the third projecting piece 23 of the second main body member 13. That is, in the third embodiment, the resonator neck 30 is formed on the branch 2 that is not located at the center of the three branches 2, 3, 4 and extends along the branch 2. The formed portion is formed between the wall surface constituted by the third projecting piece 23 of the second main body member 13 and the outer peripheral wall 24 of the resonator body member 14, and the resonator neck wall 28, and substantially One of the pair of resonator neck walls 28 in the first embodiment described above is omitted. That is, the resonator neck wall 28 extends from the opening edge of the communication hole 27 along the longitudinal direction of the collector section 5, extends along the side edge of the branch section 2 to the downstream side of the branch section, and is bent in a substantially L shape. A neck passage 29 is formed.

  As a result, the third projecting piece 23 of the second main body member 13 and the outer periphery of the resonator body member 14 constituting the outer wall surface of the resonator volume chamber 31 of the resonator 6 as one of the pair of resonator necks constituting the resonator neck 30. Since the wall 24 is shared, the cost and weight of the intake manifold 51 can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Intake manifold 2 ... Branch part 3 ... Branch part 4 ... Branch part 5 ... Collector part 6 ... Resonator part 28 ... Resonator neck wall 29 ... Resonator neck passage 30 ... Resonator neck part 31 ... Resonator volume chamber

Claims (4)

Synthetic resin in which a plurality of branch portions that distribute intake air to each cylinder are connected in parallel to the collector portion, adjacent branch portions are connected by a connecting wall, and the plurality of branch portions are curved to one side as a whole. An intake manifold main body,
A Helmholtz type resonator formed by vibration welding a resonator body member made of synthetic resin having a substantially rectangular dish shape on the outer surface of the intake manifold main body that is outside the curve;
An intake manifold for an internal combustion engine comprising:
The intake manifold main body includes a first main body member that constitutes a portion that is the inner side of the curve of the branch portion, and a second main body member that constitutes a portion that is the outer side of the curve. Formed by vibration welding to each other along,
A projecting piece that is vibration welded to the outer peripheral wall of the resonator body member is continuously formed in a frame shape corresponding to the outer shape of the resonator body member on the outer surface that is the outside of the curve of the second body member,
One end edge portion on the upstream side of the branch portion of the projecting piece having a continuous frame shape extends along the longitudinal direction of the collector portion on the outer surface of the collector portion, The other edge portion extends on the plurality of branch portions and the connecting wall therebetween so as to cross the plurality of branch portions,
A resonator volume chamber formed between the resonator body member and the intake manifold main body portion communicates with the inside of the collector portion through a single communication hole formed in the collector portion .
In the region surrounded by the frame-like projecting piece, a resonator neck wall is projected from the intake manifold main body,
The tip of the resonator neck wall is vibration welded to the resonator body member to form a resonator neck portion passage from the communication hole to the resonator volume chamber,
The resonator neck wall is a vibration welded portion of the first and second body members such that the resonator neck passage is formed on any one of the plurality of branch portions. Along the side edge of the branch,
An intake manifold for an internal combustion engine, wherein the communication hole opens at a position corresponding to the branch portion, and the resonator neck passage extends from the communication hole to the downstream side of the branch portion . Synthetic resin in which a plurality of branch portions that distribute intake air to each cylinder are connected in parallel to the collector portion, adjacent branch portions are connected by a connecting wall, and the plurality of branch portions are curved to one side as a whole. An intake manifold main body,
A Helmholtz type resonator formed by vibration welding a resonator body member made of synthetic resin having a substantially rectangular dish shape on the outer surface of the intake manifold main body that is outside the curve;
An intake manifold for an internal combustion engine comprising:
The intake manifold main body includes a first main body member that constitutes a portion that is the inner side of the curve of the branch portion, and a second main body member that constitutes a portion that is the outer side of the curve. Formed by vibration welding to each other along,
A projecting piece that is vibration welded to the outer peripheral wall of the resonator body member is continuously formed in a frame shape corresponding to the outer shape of the resonator body member on the outer surface that is the outside of the curve of the second body member,
One end edge portion on the upstream side of the branch portion of the projecting piece having a continuous frame shape extends along the longitudinal direction of the collector portion on the outer surface of the collector portion, The other edge portion extends on the plurality of branch portions and the connecting wall therebetween so as to cross the plurality of branch portions,
A resonator volume chamber formed between the resonator body member and the intake manifold main body portion communicates with the inside of the collector portion through a single communication hole formed in the collector portion.
In the region surrounded by the frame-like projecting piece, a resonator neck wall is projected from the intake manifold main body,
The tip of the resonator neck wall is vibration welded to the resonator body member to form a resonator neck portion passage from the communication hole to the resonator volume chamber,
The resonator neck wall extends from the opening edge of the communication hole so that the resonator neck passage has a substantially L shape with the downstream portion overlapping one of the branch portions. extending along the longitudinal direction of the collector portion, bent or one substantially L-shaped, the first, extends to the downstream side along the side edge of the branch portion serving as vibration welding portion of the second body member, it An intake manifold for an internal combustion engine. The intake manifold for an internal combustion engine according to claim 1 or 2 , wherein the other end edge portion has a linear shape along a longitudinal direction of the collector portion. The side edge portion connecting the one end edge portion and the other end edge portion extends along the outermost branch side edge that becomes the vibration welded portion of the first and second body members. The intake manifold for an internal combustion engine according to any one of claims 1 to 3 .

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