JP6092656B2 - Intake manifold for internal combustion engine - Google Patents

Description

  The present invention relates to an intake manifold for an internal combustion engine having a plurality of branch pipes for supplying air to the internal combustion engine.

  2. Description of the Related Art Conventionally, in a multi-cylinder engine such as an automobile, an intake manifold for an internal combustion engine is provided between an intake port of a cylinder head and a throttle valve that adjusts an intake air amount, and the intake air taken into the intake manifold for the internal combustion engine Is distributed to each intake port.

  The intake manifold for an internal combustion engine is formed by molding a resin material as disclosed in, for example, Patent Document 1, and includes a branch pipe for diverting air for each cylinder, and an upstream of the branch pipe. A throttle side mounting flange formed on the side and connected to a throttle device for adjusting the amount of air; and a cylinder side mounting flange formed on the downstream side of the branch pipe and connected to each port in the internal combustion engine. In addition, the throttle-side mounting flange and the cylinder-side mounting flange are firmly connected to each other by an integrally formed plate-like L-shaped connecting portion, thereby suppressing the vibration of the throttle-side mounting flange during vibration. Yes.

JP 2004-308506 A

  The intake manifold for the internal combustion engine as described above is formed by filling a molten resin material into a mold and curing it, and a plurality of branch pipes are curved, and the throttle side mounting flange and When the cylinder-side mounting flange is provided separately from each other, the deformation caused when the resin material is cooled is large, and a displacement occurs with the deformation, and the throttle-side mounting flange and It becomes difficult to assemble the cylinder side mounting flange at a predetermined position with respect to the counterpart member.

  Further, when such a positional deviation occurs, the throttle side mounting flange and the cylinder side mounting flange are firmly connected to each other by a connecting portion having an L-shaped cross section and high rigidity. It is difficult to relatively move the flange and the cylinder-side mounting flange, and it is difficult to assemble after adjusting the deformation.

  On the other hand, in order to suppress the displacement due to the deformation as described above, the shape of the mold for forming is adjusted, but the adjustment work is very complicated, and the manufacturing man-hours and manufacturing This will increase the cost. Moreover, since it is necessary to hold the molded product in the mold for a certain period of time in order to secure the cooling time for suppressing the displacement, the production time becomes longer and the productivity is deteriorated accordingly. .

  The present invention has been made in consideration of the above-described problems, and is an intake manifold for an internal combustion engine capable of improving product accuracy by suppressing deformation that occurs during molding and at the same time improving assembly. The purpose is to provide.

In order to achieve the above-mentioned object, the present invention comprises a surge tank, a branch pipe connecting each cylinder of an internal combustion engine and the surge tank, and an inlet for taking intake gas into the surge tank. An introduction part that forms a flow path for introducing the suction gas from the introduction port to the surge tank; and a discharge port that communicates with the branch pipe and sends the suction gas to each cylinder. An intake manifold for an internal combustion engine that is formed by molding a resin material.
The introduction portion is integrally provided with a rib that extends toward the lead-out portion and is connected to the lead-out portion or the branch pipe. The rib includes the lead-in portion and the lead-out portion or the branch. It is formed thinner than the tube wall of the introduction part and the lead-out part or the branch pipe so as to be cured prior to the pipe, and further , the introduction part can be held elastically and freely movable. Features.

  According to the present invention, in the intake manifold for an internal combustion engine made of a resin material, the introduction portion for taking in the intake gas into the surge tank is directed toward the lead-out portion for sending the intake gas to each cylinder of the internal combustion engine. And a rib that is integrally connected to the branch pipe or the lead-out portion that connects each cylinder of the internal combustion engine and the surge tank, and the rib includes the introduction portion, the lead-out portion, or the branch It is thinner than the thickness of the tube wall of the tube and can be elastically deformed.

  Then, when the intake manifold for the internal combustion engine is molded from a resin material, the rib is formed thinner than the thickness of the pipe wall of the introduction part, the lead-out part or the branch pipe. Since it can be filled and cured in advance, relative positioning can be performed before the introduction part, the lead-out part or the branch pipe starts to be cured by the rib.

  As a result, the relative displacement between the introduction part and the lead-out part is suppressed by the rib due to deformation during molding, and the introduction part and the lead-out part can be positioned with high accuracy, and are placed at a predetermined position corresponding to the mating member and reliably. In addition to being able to be assembled easily, even when the position of the introducing portion is displaced due to slight deformation, it can be easily assembled by moving the introducing portion to match the mating member to be connected while elastically deforming the rib. Therefore, it becomes possible to improve the assembling property. Further, since the misalignment can be suppressed by providing the rib, it is not necessary to secure a cooling time for suppressing the misalignment, and the production time can be shortened and the production efficiency can be improved.

  In addition, since the rib can be filled with the material first with respect to the introduction part and the lead-out part when forming from a resin material by forming a small volume relative to the introduction part and the lead-out part, By curing in advance, relative positioning can be performed before the introduction portion and the lead-out portion begin to be cured by the rib.

  Further, at least one of the introduction part and the lead-out part is provided with a curved part formed so as to change the flow direction of the intake gas in the middle of the flow path, thereby generating the above-described intake manifold for the internal combustion engine. The deformation (warpage) of the curved portion can be effectively suppressed by the rib, and the displacement of the introduction portion and the lead-out portion due to the deformation can be suppressed.

  Furthermore, the rib is connected to the upstream side of the bending portion with respect to the introduction portion, and is connected to the downstream side of the bending portion with respect to the connection portion of the rib to the lead-out portion, whereby one end of the bending portion. It is possible to effectively suppress the displacement of the introduction part and the lead-out part due to the warp (deformation) on the side and the other end side by the rib.

  Furthermore, since the rib connecting portion is offset from the flange portion of the lead-out portion toward the curved portion, the rib is provided on the curved portion having a large deformation amount during molding. (Warpage) can be effectively suppressed, and accordingly, it is possible to reliably connect by suppressing deformation of the introduction portion and improving positioning accuracy.

  The introduction unit includes a first introduction unit and a second introduction unit provided in the vicinity of the first introduction unit, and extends to the second introduction unit toward the derivation unit side. Even if an intake manifold having a plurality of first and second introduction portions is provided by integrally providing the rib connected to the lead-out portion, the first introduction portion, the second introduction portion, The relative positioning of the introduction part and the lead-out part can be accurately performed by the rib.

  According to the present invention, the following effects can be obtained.

  That is, when the intake manifold for the internal combustion engine is molded from a resin material, the rib formed thinner than the pipe wall of the introduction part, the lead-out part or the branch pipe is quickly filled with the material, and the introduction part or the like Since it can be hardened in advance, the rib enables relative positioning before the introduction portion, the lead-out portion or the branch pipe starts to harden. As a result, the relative positional deviation of the introduction part and the lead-out part due to deformation during molding can be suppressed by the rib, and accordingly, the positioning accuracy of the introduction part and the lead-out part is improved with respect to the counterpart member It can be assembled reliably and easily, and even if the position of the introduction part is shifted due to slight deformation, it can be easily moved by fitting the introduction part to the mating member to be connected while elastically deforming the rib. Since it can assemble | attach, the improvement of an assembly | attachment property can be aimed at.

1 is an overall front view of an intake manifold for an internal combustion engine according to an embodiment of the present invention. FIG. 2 is a side view of the intake manifold for the internal combustion engine of FIG. 1. FIG. 2 is a front view of a main body portion in a branch pipe constituting the intake manifold for the internal combustion engine of FIG. 1.

  A preferred embodiment of an intake manifold for an internal combustion engine according to the present invention will be given and described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates an intake manifold for an internal combustion engine according to an embodiment of the present invention.

  The internal combustion engine intake manifold 10 (hereinafter referred to as an intake manifold 10) is used in, for example, a four-cylinder internal combustion engine having four cylinder chambers mounted on a vehicle or the like.

  As shown in FIGS. 1 and 2, the intake manifold 10 is formed of, for example, a thermoplastic resin and includes a branch pipe 14 having a plurality of first to fourth branch passages 12 a to 12 d, and the branch pipe 14. A surge tank 16 to which one end of each is connected, a first suction connection portion (second introduction portion) 18 provided at one end along the longitudinal direction (arrow A, B direction) of the surge tank 16, A second suction connection portion (first introduction portion) 20 that supplies exhaust gas (suction gas) between the first suction connection portion 18 and the surge tank 16 is included.

  The branch pipe 14 is formed with a predetermined width in the longitudinal direction of the surge tank 16 (in the directions of arrows A and B), and extends from one end connected to the surge tank 16 to the other end connected to the cylinder head of the internal combustion engine. It is formed in a cross-sectional curved shape. The branch pipe 14 is connected to the surge tank 16, and has a main body portion (one divided body) 22 in which a plurality of first to fourth branch passages 12 a to 12 d are formed, and a side of the main body portion 22. And a branch pipe cover (the other divided body) 26 that closes the opened opening 24. That is, the branch pipe 14 is configured by a divided body including the main body 22 and the branch pipe cover 26, and a part of the main body 22 in which the first to fourth branch passages 12a to 12d are formed and the branch pipe. A curved portion is constituted by the cover 26.

  The branch pipe cover 26 is attached to the opening 24 of the main body portion 22 to close the first to fourth branch passages 12a to 12d, and the branch passages 12a to 12d extend from the main body portion 22. It is mounted so as to be separable in the direction, that is, the direction intersecting the flow direction of the fluid (intake gas).

  The first to fourth branch passages 12a to 12d are formed at regular intervals along the longitudinal direction of the surge tank 16 (directions of arrows A and B).

  As shown in FIGS. 1 to 3, the main body portion 22 has one end connected to the surge tank 16 for communication, and the other end connected to a cylinder head of an internal combustion engine (not shown). Part) 28 is formed. The mounting flange 28 is integrally formed along the longitudinal direction of the surge tank 16, and outlet ports 30 communicating with the first to fourth branch passages 12 a to 12 d are respectively formed on the end surfaces thereof. Further, bolt holes 32 are formed in the attachment flange 28 between the outside of the lead-out port 30 and between the lead-out ports 30, respectively. Bolts are inserted into the bolt holes 32 and screwed into a cylinder head (not shown). The other end of the branch pipe 14 is fixed to the end face of the cylinder head via the mounting flange 28.

  The first suction connection portion 18 is provided on the side of the surge tank 16, that is, on one end side (in the direction of arrow A) of the main body portion 22 along the longitudinal direction of the surge tank 16, and is formed in a substantially rectangular shape, for example. And a flange portion 34 connected to an intake pipe (not shown). A first introduction port 36 (see FIG. 2) is opened at the center of the flange 34, and bolt holes 32 through which bolts for connection to the end of the intake pipe are inserted are formed at the four corners. .

  A flange of an intake pipe (not shown) is connected to the flange portion 34 via a plurality of bolts (not shown) and the air introduced through an air cleaner (not shown) is flowed by the throttle body to the first suction connection portion 18. After being adjusted, it is supplied to the surge tank 16 through the first introduction port 36 of the first suction connection portion 18.

  The second suction connection portion 20 is disposed in the main body portion 22 between the first suction connection portion 18 and the surge tank 16 and is provided so as to be substantially orthogonal to the first suction connection portion 18. A second introduction port 38 opens at the center of the second suction connection portion 20, and the second introduction port 38 is a flow path (not shown) for connecting the first introduction port 36 and the surge tank 16. Connected to. That is, the first and second suction connection portions 18 and 20 are each provided in the main body portion 22 constituting the branch pipe 14.

  The second suction connection portion 20 is provided with a pair of first and second mounting flanges 40 and 42 connected to an EGR supply passage of a cylinder head (not shown) outside the second introduction port 38. The first mounting flange 40 extends from the second introduction port 38 toward the surge tank 16 side, and a mounting hole 44 through which a fastening bolt is inserted is formed at the tip thereof. That is, in the intake manifold 10, the mounting flange 28 that constitutes the main body portion 22 and the second suction connection portion 20 are fastened to a cylinder head (not shown) that is the same member.

  The second mounting flange 42 is provided at a position opposite to the first mounting flange 40 with the second introduction port 38 as a center, and extends in a direction away from the surge tank 16 from the second introduction port 38. A mounting hole 44 through which a fastening bolt is inserted is formed at the tip. That is, the first and second mounting flanges 40 and 42 are provided on a substantially straight line with the second introduction port 38 as the center.

  And the flange of EGR supply piping is connected to the 1st and 2nd attachment flanges 40 and 42 in the 2nd suction connection part 20 via a fastening bolt, and the exhaust gas exhausted with the internal-combustion engine is the 2nd introduction. It is supplied to the port 38 and introduced into the surge tank 16 together with air through a flow path (not shown).

  The first connecting rib 46 is connected to the second mounting flange 42 between the flange portion 34 of the first suction connecting portion 18 and the second connecting rib 48 between the end portion of the mounting flange 28. Is connected. The first and second connecting ribs 46 and 48 are respectively connected to the tips of the second mounting flanges 42 and, as shown in FIG. 2, are plate-shaped having a predetermined width along the extending direction of the bolt holes 32. And a thin plate with a substantially constant thickness. Moreover, the 1st and 2nd connection ribs 46 and 48 have a flexible elasticity by giving a predetermined load. In other words, the first and second connecting ribs 46 and 48 have a smaller volume and are formed thinner than the first suction connecting portion 18 and the mounting flange 28 to be connected, respectively.

  Specifically, as shown in FIG. 1, the first connecting rib 46 connects the distal end of the second mounting flange 42 and the end of the flange portion 34 of the first suction connection portion 18 in a straight line, and The connecting rib 48 connects the end of the second mounting flange 42 and the end of the mounting flange 28 closest to the second mounting flange 42 (in the direction of arrow A) in a straight line. The first connecting rib 46 and the second connecting rib 48 are connected so as to be inclined by a predetermined angle.

  Further, as shown in FIG. 2, the first and second connecting ribs 46, 48 are offset toward the branch pipe 14 (in the direction of arrow C) with respect to the mounting surface 28 a of the mounting flange 28, and the mounting surface 28a is formed substantially parallel to the upstream end 24a of the opening 24 in the main body 22, and is also offset from the branch pipe 14 (in the direction of arrow C). The first and second connecting ribs 46 and 48 are limited to a case where the first and second connecting ribs 46 and 48 are arranged offset from the upstream end 24a of the opening 24 toward the branch pipe 14 (in the direction of arrow C in FIG. 2). For example, you may make it arrange | position offset with respect to the branch pipe 14 side with respect to the downstream edge part 24b of the opening part 24 used as the attachment flange 28 side. That is, the first and second connecting ribs 46 and 48 may be disposed on the branch pipe 14 side from at least one of the upstream end 24a and the downstream end 24b of the opening 24.

  The second connecting rib 48 may connect the second mounting flange 42 and the pipe wall of the branch pipe 14. In this case, the second connecting rib 48 is connected to the pipe of the branch pipe 14. It is formed so as to be thin with respect to the wall and to have a small volume.

  The intake manifold 10 for an internal combustion engine according to the embodiment of the present invention is basically configured as described above. Next, a main body portion 22 constituting the intake manifold 10 is made of a resin material (for example, The case of molding with a thermoplastic resin will be briefly described.

  First, a molten resin material is poured into a mold in which a cavity having the shape of the main body 22 is formed, and then cooled over a predetermined time. At this time, the first and second connecting ribs 46 and 48 having a small volume with respect to the branch pipe 14, the first and second suction connection portions 18 and 20, the mounting flange 28, and the like are first filled. It begins to harden when cooled. In other words, the first and second connecting ribs 46 and 48 formed in a thin plate shape are preceded by resin before the first and second suction connection portions 18 and 20 and the mounting flange 28 formed in a block shape. The material is filled and shaped.

  Therefore, the first and second connecting ribs 46 and 48 start to harden before the surrounding portions start to harden, so that the first suction connecting part 18 and the mounting flange 28 of the second suction connecting part 20 are cured. Relative positioning is achieved by the first and second connecting ribs 46, 48.

  After the first and second connecting ribs 46 and 48 are hardened, the branch pipe 14, the first and second suction connection parts 18 and 20, the mounting flange 28 and the like start to harden gradually, and the entire main body part 22 is By completely cooling and curing, the molding of the main body 22 constituting the intake manifold 10 is completed.

  At this time, even when the large-volume branch pipe 14, the first and second suction connection portions 18, 20 and the mounting flange 28 are deformed during cooling, the already-cured first and second connecting ribs 46, 48, the relative positional relationship between the first and second suction connection portions 18, 20 and the mounting flange 28 is maintained without change.

  Thus, in the intake manifold 10 having the first and second suction connection portions 18 and 20, the second mounting flange 42 of the second suction connection portion 20, the flange of the first suction connection portion 18, and the mounting flange 28 By providing the thin plate-like first and second connecting ribs 46 and 48 that respectively connect the first and second connecting ribs 46 and 48 at the time of molding, the first and second connecting ribs 46 and 48 can be cured in advance. The second connecting ribs 46 and 48 can be positioned relative to each other before the first suction connection 18, the second suction connection 20 and the mounting flange 28 are cured.

  As a result, when the main body portion 22 of the intake manifold 10 is manufactured by molding, the relative positional relationship between the first suction connection portion 18, the second suction connection portion 20, and the mounting flange 28 due to the cooling is suppressed. It becomes possible.

  Next, an example in which the intake manifold 10 including the main body portion 22 formed as described above is assembled to the cylinder head, the intake pipe, and the EGR supply pipe of the internal combustion engine will be described. In this case, the branch pipe cover 26 is attached in advance to the opening 24 of the main body 22.

  First, with the mounting flange 28 in contact with the end face of the cylinder head in the internal combustion engine, the bolts 32 are inserted into the bolt holes 32 and fastened to the cylinder heads, whereby the outlet ports 30 of the branch pipes 14 are respectively connected. The cylinder head is mounted in communication with a port (not shown) of the cylinder head.

  Next, after connecting an intake pipe (not shown) to the flange portion 34 of the first suction connection portion 18 and fastening it with a bolt inserted into the bolt hole 32, the first suction connection portion 20 is connected to the first suction connection portion 20. And the 2nd mounting flanges 40 and 42 are each assembled | attached with the flange of the EGR supply piping which is not shown in figure. At this time, if the second suction connection portion 20 is deformed when the main body portion 22 is molded and the relative positions with respect to the first suction connection portion 18 and the mounting flange 28 are shifted, the second suction connection portion 20 is changed. By pressing in a desired direction so as to match the mounting position of the EGR supply pipe on the other side, the first and second connecting ribs 46 and 48 are bent and elastically deformed, and can be moved horizontally. Therefore, the second suction connection portion 20 moved to a desired position can be assembled to the flange of the EGR supply pipe.

  As described above, in the present embodiment, in the main body portion 22 constituting the intake manifold 10, the first suction connection portion 18 connected to the intake piping, and the second suction connection portion 20 connected to the EGR supply piping, And a mounting flange 28 connected to a cylinder head of an internal combustion engine for supplying air and exhaust gas supplied from the first and second suction connection portions 18 and 20 to the cylinder head, and the first suction connection portion. A thin plate-like first and second connecting ribs 46 and 48 are provided between the second suction connection portion 20 and the second suction connection portion 20, and between the second suction connection portion 20 and the mounting flange 28, respectively.

  In this manner, the first and second connecting ribs 46 and 48 are formed with a small volume with respect to the first and second suction connection portions 18 and 20, the mounting flange 28, etc., so that the intake manifold 10 is made of a resin material. When molding from the above, the material filled in the first and second connecting ribs 46 and 48 is rapidly cured in advance to other parts such as the first and second suction connection portions 18 and 20. Therefore, after the first and second suction connection portions 18 and 20 and the mounting flange 28 are relatively positioned by the first and second connection ribs 46 and 48, the first and second connection ribs 46 and 48 are used. The suction connection portions 18 and 20 and the mounting flange 28 can be hardened.

  As a result, it is possible to prevent the relative positions of the first and second suction connection portions 18 and 20 and the mounting flange 28 from being displaced due to deformation at the time of molding, and it can be reliably and easily assembled at a predetermined position. Even when the position of the second suction connecting portion 20 with respect to the first suction connecting portion 18 and the mounting flange 28 is shifted due to slight deformation, the first and second connecting ribs 46 and 48 are elastically flexible. Since it is formed, it is possible to easily assemble the second suction connection portion 20 by moving the second suction connection portion 20 so as to match the position of the flange of the EGR supply pipe to be connected. Can be achieved. Further, since the first and second connecting ribs 46 and 48 are provided, the relative displacement between the first and second suction connection portions 18 and 20 and the mounting flange 28 can be suppressed. This eliminates the need for the cooling time, and accordingly, the production time can be shortened, so that the production efficiency can be improved.

  Further, the first connecting rib 46 is connected to the end of the flange portion 34 in the first suction connecting portion 18, and the second connecting rib 48 is connected to the end of the mounting flange 28 in the branch pipe 14, respectively. Therefore, the deformation of the first suction connection portion 18 and the mounting flange 28 during molding can be more reliably suppressed.

  Further, since the second connecting rib 48 is arranged offset from the mounting surface 28a of the mounting flange 28 in the branch pipe 14 toward the branch pipe cover 26 (in the direction of arrow C), a large amount of deformation occurs during molding. By providing the second connecting rib 48 on the branch pipe 14 side (in the direction of arrow C), deformation (warp) of the branch pipe 14 can be effectively suppressed, and accordingly, the second suction connection portion 20 is provided. Therefore, the positioning accuracy can be improved.

  Further, the branch pipe 14 is constituted by a main body portion 22 and a branch pipe cover 26 that can be divided in a direction intersecting with the flow direction of air or exhaust gas, and the main body portion 22 has first and second suction connection portions 18, 20. By providing the mounting flange 28, the first and second connecting ribs 46 and 48 can suppress displacement caused by warping (deformation) of the branch pipe 14 at one end and the other end.

  Further, the first and second connecting ribs 46 and 48 are provided offset from the opening 24 of the main body portion 22 to which the branch pipe cover 26 is attached in the branch pipe cover 26 side (arrow C direction). The deformation (warping) of the branch pipe 14 including the branch pipe cover 26 can be further effectively suppressed.

  Further, even if the first suction connection portion 18 and the second suction connection portion 20 are disposed adjacent to each other, the first and second suction connection portions are connected to each other by the first connecting rib 46. By suppressing the deformation of the first and second ribs 18 and 20 and making the first connecting rib 46 bendable, the first connecting rib 46 can be reliably assembled at a predetermined position.

  Of course, the intake manifold for an internal combustion engine according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Intake manifold for internal combustion engines 12a-12d ... 1st-4th branch passage 14 ... Branch pipe 16 ... Surge tank 18 ... 1st suction connection part 20 ... 2nd suction connection part 22 ... Main-body part 26 ... Branch pipe cover 28 ... mounting flange 30 ... outlet port 34 ... flange portion 36 ... first introduction port 38 ... second introduction port 40 ... first attachment flange 42 ... second attachment flange 46 ... first connection rib 48 ... second connection rib

Claims (6)

A surge tank, a branch pipe connecting each cylinder of the internal combustion engine and the surge tank, and an inlet for introducing the intake gas into the surge tank; a flow for introducing the intake gas from the inlet to the surge tank An introduction portion that forms a passage; and a lead-out portion that communicates with the branch pipe and has a lead-out port that sends out the suction gas to the cylinders and forms a flow path between the surge tank and the lead-out port. In an intake manifold for an internal combustion engine formed by molding a resin material,
The introduction portion is integrally provided with a rib that extends toward the lead-out portion and is connected to the lead-out portion or the branch pipe. The rib includes the lead-in portion and the lead-out portion or the branch. It is formed thinner than the tube wall of the introduction part and the lead-out part or the branch pipe so as to be cured prior to the pipe, and further , the introduction part can be held elastically and freely movable. An intake manifold for an internal combustion engine. The intake manifold for an internal combustion engine according to claim 1,
The intake manifold for an internal combustion engine, wherein the rib has a smaller volume than the introduction portion and the lead-out portion. The intake manifold for an internal combustion engine according to claim 1 or 2,
An intake manifold for an internal combustion engine, wherein at least one of the introduction part and the lead-out part has a curved part formed so as to change a flow direction of the intake gas in the middle of the flow path. The intake manifold for an internal combustion engine according to claim 3,
The internal combustion engine, wherein the rib is connected to the upstream side of the bending portion with respect to the introduction portion, and is connected to the downstream side of the bending portion with respect to a connection portion of the rib to the lead-out portion. Intake manifold. The intake manifold for an internal combustion engine according to claim 3 or 4,
The intake manifold for an internal combustion engine, wherein the connecting portion of the rib is arranged to be offset toward the curved portion with respect to the flange portion in the lead-out portion. The intake manifold for an internal combustion engine according to any one of claims 1 to 5,
The introduction portion has a first introduction portion and a second introduction portion provided in the vicinity of the first introduction portion, and extends toward the lead-out portion side in the second introduction portion. And the said manifold connected to the said derivation | leading-out part is provided integrally, The intake manifold for internal combustion engines characterized by the above-mentioned.

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