JP2009236084A - Intake device of internal combustion engine and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device of an internal combustion engine having a simple structure in which its assembly is easy, and a manufacturing method suitable for manufacturing the intake device. <P>SOLUTION: An air-flow control valve 40 is provided in an intake passage 11 in an internal combustion engine 10. The intake passage 11 is formed by connecting an intake manifold 20 and a cylinder head 30 together. The air-flow control valve 40 has bearing parts 44 for rotatably supporting rotary shafts 43, and valve bodies 41 fixed to the rotary shafts 43 so as to be exposed to the inside of the intake passage 11. Each bearing part 44 is press-fitted into a counter face (mounting groove 38 of a wall part 35) on the side of the cylinder head 30 among the counter faces at the connection between the intake manifold 20 in the intake passage 11 and the cylinder head 30, so as to be fixed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intake device for an internal combustion engine in which an airflow control valve for changing a flow mode of intake air is provided in an intake passage, and a method for manufacturing the intake device.

  In recent years, air flow control valves such as a control valve for forming a vortex flow (so-called tumble flow or swirl flow) in the combustion chamber and a control valve for changing the effective length of the intake passage have been used in the intake passage of the internal combustion engine. Providing it is proposed and put into practical use.

  As an intake device for an internal combustion engine provided with such an airflow control valve, for example, a device described in Patent Document 1 is known. In this intake device, an intermediate member having a built-in airflow control valve is interposed in the intake passage of the internal combustion engine. The intermediate member has a body portion in which a part of the intake passage is formed, a turning shaft supported by the body portion so as to be rotatable, and the rotation of the intermediate member exposed to the inside of the intake passage. And a valve body fixed to the shaft. The airflow control valve is constituted by the rotating shaft and the valve body.

In the intake device, the opening of the air flow control valve (specifically, the valve body) is adjusted by rotating the rotating shaft through the operation control of a separately provided actuator, and the flow mode of the intake air in the intake passage Is changed.
Special table 2003-515027 gazette

  Here, in the above intake device, since the intermediate member is provided in the middle of the intake passage, the structure of the intake device is complicated accordingly. And when the intake device has such a complicated structure, it is inevitable that work for assembling the intake device becomes complicated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an intake device for an internal combustion engine having a simple structure that can be easily assembled, and a manufacturing method suitable for use in manufacturing the intake device. It is in.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 is an intake device for an internal combustion engine in which an airflow control valve for changing a flow mode of intake air is provided in the intake passage, wherein the intake passage has a portion on the upstream side in the intake flow direction. The upstream member constituting and the downstream member constituting the downstream portion in the intake flow direction are connected to each other, and the airflow control valve is a bearing portion that supports the rotation shaft in a rotatable state. And a valve body fixed to the rotating shaft in a state exposed to the inside of the intake passage, and the bearing portion at a joint of the upstream member and the downstream member in the intake passage The gist is that it is press-fitted and fixed to one of the opposing surfaces.

  In the above configuration, since the assembly including the rotation shaft of the airflow control valve, the bearing portion, and the valve body is directly attached to the joint of the intake passage, the intermediate portion for supporting the rotation shaft, the bearing portion, and the valve body is provided. Compared with a configuration in which the member is provided between the upstream member and the downstream member in the intake passage, the intake device has a simple structure. Moreover, since the bearing portion of the assembly is press-fitted and fixed to one of the upstream member and the downstream member, the assembly does not come off when connecting the upstream member and the downstream member to each other, Work for the connection becomes easy. Therefore, according to the above configuration, the intake device can be easily assembled.

  According to a second aspect of the present invention, in the intake device for an internal combustion engine according to the first aspect, the downstream member has a partition wall that divides the inside into a plurality of branch passages, and the airflow control valve is The valve body is also provided so that one end of the valve body is connected to the partition wall so as to partition the inside of the intake passage into a plurality of branch passages, and air to the plurality of branch passages The gist of the invention is to change the inflow mode, and that the bearing portion is press-fitted and fixed to the opposing surface of the downstream member among the opposing surfaces.

  In the above configuration, the vibration generated by the operation of the internal combustion engine is transmitted from the downstream member to the upstream member, and therefore, the vibration mode of the upstream member may be different from the vibration mode of the downstream member. Therefore, if a partition wall is formed on the downstream member and the valve body of the airflow control valve is attached to the upstream member, the partition is caused by the difference between the vibration mode of the upstream member and the vibration mode of the downstream member. There is a possibility that the position of the wall and the valve body will be displaced. Then, if the partition wall and the valve body are displaced in this way, a step is generated at the boundary between the partition wall and the valve body, or the step becomes large, which may hinder the smooth flow of intake air. There is.

  In this regard, according to the above configuration, since the partition wall and the valve body of the airflow control valve are both provided in the downstream member, the partition wall and the valve are caused by the difference in the vibration modes of the upstream member and the downstream member. It is possible to suppress the generation of a step at the boundary portion with the body and an increase in the step, and to realize a smooth flow of intake air.

  According to a third aspect of the present invention, there is provided an intake device for an internal combustion engine according to the second aspect, wherein the upstream side member is an intake manifold and the downstream side member is a cylinder head.

  In the above configuration, since the weight of the intake manifold as the upstream member is large, the difference between the vibration mode of the intake manifold and the vibration mode of the cylinder head as the downstream member tends to be large due to the influence of inertia.

In this regard, according to the above-described configuration, it is possible to suitably suppress the occurrence of a step at the boundary portion between the partition wall and the valve body and an increase in the step in such a device.
The gist of the invention according to claim 4 is that, in the intake device for an internal combustion engine according to claim 2 or 3, the upstream member and the downstream member are made of materials having different thermal expansion coefficients. And

  In the above configuration, the amount of thermal expansion due to the temperature rise accompanying the operation of the internal combustion engine is different between the upstream member and the downstream member. If the is attached, the position of the partition wall and the valve body may be shifted due to the difference in the amount of thermal expansion. This may hinder the smooth flow of intake air.

  In this regard, according to the above configuration, since the partition wall and the valve body of the airflow control valve are both provided in the downstream member, the partition wall is caused by the difference in thermal expansion amount between the upstream member and the downstream member. It can suppress that a level | step difference arises in the boundary part of a valve body, and that the level | step difference becomes large.

  When the configuration described in claim 4 is applied to the configuration described in claim 3, it is possible to adopt a configuration in which the intake manifold is formed of a resin material and the cylinder head is formed of a metal material. .

  As the air flow control valve, besides the one for changing the effective length of the intake passage, a vortex flow (so-called tumble flow or swirl flow) is formed in the combustion chamber of the internal combustion engine as in claim 5. Including things for.

  A sixth aspect of the present invention is a method of manufacturing the intake device for an internal combustion engine according to any one of the first to fifth aspects, wherein the assembly includes the rotating shaft, the bearing portion, and the valve body. A first step of forming a body; a second step of press-fitting and fixing the bearing portion of the assembly to one of the opposing surfaces; and a third step of fixing the upstream member and the downstream member to each other. The gist is to provide.

  According to the above manufacturing method, when the members composed of the rotation shaft, the bearing portion, and the valve body of the airflow control valve are fixed to one of the upstream member and the downstream member, The assembly does not come off and the connection work can be easily performed. Therefore, the intake device can be easily assembled.

Hereinafter, an embodiment of the present invention will be described.
FIG. 1 shows a schematic configuration of an internal combustion engine to which an intake device according to the present embodiment is applied.
As shown in FIG. 1, as the internal combustion engine 10 of the present embodiment, an internal combustion engine having a plurality (four in the present embodiment) of cylinders 10a is employed.

  Air is taken into each cylinder 10 a of the internal combustion engine 10 through the intake passage 11. The intake passage 11 includes an intake pipe 12 and an intake manifold 20. The intake pipe 12 is a portion constituting the upstream side in the intake flow direction in the intake passage 11 and is a shared portion through which air (intake) taken into each cylinder 10a passes. The intake manifold 20 communicates each cylinder 10 a of the internal combustion engine 10 and the intake pipe 12. Specifically, a portion of the intake manifold 20 on the upstream side in the intake flow direction (hereinafter simply referred to as “downstream side”) is connected to the intake pipe 12. In addition, the intake manifold 20 has a portion downstream of the intake flow direction (hereinafter simply referred to as “upstream side”) branched into a plurality of (four in the present embodiment) passages (branch pipes 21). A pipe 21 communicates with each cylinder 10 a of the internal combustion engine 10 (specifically, an intake port 31 formed inside the cylinder head 30). The intake port 31 formed in the cylinder head 30 of the internal combustion engine 10 is branched into two passages (branch port 32) along the way. In the internal combustion engine 10, the intake air is distributed and supplied to each cylinder 10 a by the intake manifold 20 after passing through the intake pipe 12.

  On the other hand, the gas (exhaust gas) burned in each cylinder 10 a of the internal combustion engine 10 is exhausted through the exhaust passage 13. The exhaust passage 13 includes an exhaust manifold 14 and an exhaust pipe 15. The exhaust manifold 14 is formed in a shape branched into a plurality of (four in this embodiment) passages (branch pipes 16) in the middle, and these branch pipes 16 are formed in the cylinders 10a of the internal combustion engine 10 (specifically, The exhaust ports 17) formed in the cylinder head 30 are communicated with each other. Further, the portion of the exhaust manifold 14 where the branch pipes 16 are joined is connected to the exhaust pipe 15. In the internal combustion engine 10, the exhaust discharged from each cylinder 10 a is collected by the exhaust manifold 14 and then discharged to the outside of the exhaust passage 13 through the exhaust pipe 15.

FIG. 2 shows an internal structure of the intake device according to the present embodiment.
As shown in FIG. 2, the cylinder head 30 of the internal combustion engine 10 is formed with an intake port 31 that communicates the branch pipe 21 of the intake manifold 20 and the combustion chamber 18. The intake port 31 is provided with a partition wall 34 having a shape that divides the inside thereof into two branch passages 33 (specifically, a shape that partitions the upper portion and the lower portion in FIG. 2). The partition wall 34 is formed in a shape extending from the vicinity of the end of the intake port 31 on the intake manifold 20 side to the middle of each branch port 32.

  On the other hand, an airflow control valve 40 is provided in the intake passage 11 of the internal combustion engine 10. The air flow control valve 40 is for forming a spiral flow (specifically, a tumble flow) in the combustion chamber 18 of the internal combustion engine 10. The valve body 41 of the air flow control valve 40 is connected to the partition wall 34 at one end (specifically, the downstream end) so that the inside of the intake passage 11 is partitioned into the plurality of branch passages 33 together with the partition wall 34. It is arranged. If a step is formed inside the intake passage 11, this causes a hindrance to the smooth flow of the intake air. Therefore, the valve element 41 is formed in a shape that does not cause a step as much as possible at the boundary portion with the partition wall 34. Arranged.

  The valve element 41 of the airflow control valve 40 is provided so as to be rotatable around a downstream end as shown by an arrow in FIG. Adjustment of the rotational position of the valve body 41 of the airflow control valve 40 is performed through operation control of an actuator 42 provided separately.

  Then, the valve element 41 of the airflow control valve 40 closes the opening on the intake manifold 20 side of one of the branch passages 33 (specifically, the lower branch passage 33 in FIG. 2) (one point in FIG. 2). In a state indicated by a chain line (valve closed state), intake air flows into the combustion chamber 18 only through the other of the branch passages 33 (the upper branch passage 33 in FIG. 2). For this reason, intake air flows into the combustion chamber 18 only from a specific portion of each branch port 32 of the intake port 31, thereby causing a vortex flow (specifically, a tumble flow) inside the combustion chamber 18. To occur.

  When the valve element 41 of the airflow control valve 40 opens the opening on the intake manifold 20 side of each branch passage 33 (state indicated by a solid line in FIG. 2 (valve open state)), each branch passage in the intake port 31 The intake air flows into the gas passage 33, and the intake air flows into the combustion chamber 18 from the branch passages 33. Therefore, at this time, the intake air flows into the combustion chamber 18 from the entire branch ports 32 of the intake port 31, and the vortex flow generated in the combustion chamber 18 becomes weak or the vortex flow is generated. No longer.

  In the present embodiment, the airflow control valve 40 is provided between the intake manifold 20 and the cylinder head 30 in order to make the intake device of the internal combustion engine 10 simple and easy to assemble.

Below, the structure around the arrangement | positioning part of such an airflow control valve 40 is demonstrated in detail.
FIG. 3 shows an exploded perspective structure of the internal combustion engine 10 and the intake passage 11 around the airflow control valve 40.

  As shown in FIG. 3, an opening 36 of each intake port 31 is formed in one wall (wall portion 35) of the cylinder head 30. In addition, a plurality (five in the present embodiment) of screw holes 37 are formed in the wall portion 35. These screw holes 37 are used when the intake manifold 20 is attached. Further, the wall 35 is formed with a groove (attachment groove 38) having a shape extending linearly so as to connect the opening 36 of each intake port 31. The attachment groove 38 extends in a direction along the partition wall 34 formed in each intake port 31. The cylinder head 30 is formed of a metal material (specifically, an aluminum alloy). The mounting groove 38 is formed in the cylinder head 30 through cutting.

  The airflow control valve 40 includes a rotation shaft 43 common to all the cylinders 10a. A plurality (four in the present embodiment) of valve bodies 41 are fixed to the rotating shaft 43. One valve body 41 is provided for each intake port 31. The airflow control valve 40 includes a plurality of (five in the present embodiment) bearings 44 that support the pivot shaft 43 in a pivotable state. These bearing portions 44 are individually attached at positions where the opening portions 36 of the respective intake ports 31 are sandwiched between the two bearing portions 44.

  In the present embodiment, the gasket 22 is provided between the intake manifold 20 and the intake port 31. The gasket 22 is for preventing leakage of intake air from the inside of the intake passage 11 through the connection portion between the intake manifold 20 and the intake port 31 to the outside. The gasket 22 includes a surrounding portion 22a that surrounds the entire periphery of the opening 36 of each intake port 31, and a connection portion 22b that integrally connects the surrounding portions 22a.

  A flange portion 23 is formed at the tip of each branch pipe 21 of the intake manifold 20 so as to project in a bowl shape. A plurality (five in the present embodiment) of through holes 24 are formed in the flange portion 23. These through holes 24 are used when the intake manifold 20 is attached to the cylinder head 30. Further, a groove (not shown) having a shape corresponding to the gasket 22 is formed on the surface of the branch pipe 21 on the side facing the cylinder head 30. When the intake manifold 20 is attached to the cylinder head 30 with the gasket 22 attached to the groove, the gasket 22 is sandwiched between the cylinder head 30 and the intake manifold 20. The intake manifold 20 is made of a resin material (synthetic resin).

  In the present embodiment, the intake manifold 20 is screwed into the screw hole 37 of the wall portion 35 of the cylinder head 30 in a state where the bolt 25 is inserted into the through hole 24 of the flange portion 23 of the intake manifold 20. Fixed to.

FIG. 4 shows an execution procedure of work related to the assembly of the intake device of the internal combustion engine 10.
Hereinafter, an operation for assembling the intake device of the internal combustion engine 10 will be described with reference to FIG.

  In this operation, first, in the first step, a plurality of valve bodies 41 (FIG. 3), a rotating shaft 43, and a plurality of bearing portions 44 are integrally assembled (aggregate 45) (FIG. 5). 4 step S10).

  Next, in the second step, the assembly 45 is attached to the opposing surface (specifically, the wall portion 35) of the cylinder head 30 among the opposing surfaces of the intake manifold 20 (FIG. 3) and the cylinder head 30. Specifically, as shown in FIG. 5, each bearing portion 44 of the assembly 45 is press-fitted and fixed in the mounting groove 38 of the cylinder head 30 (step S20 in FIG. 4). FIG. 5 shows an enlarged cross-sectional structure of the internal combustion engine 10 around the bearing portion 44.

  Next, in the third step, the intake manifold 20 (FIG. 3) and the cylinder head 30 are fixed to each other (step S30 in FIG. 4). Specifically, a gasket 22 is attached to the flange portion 23 of the intake manifold 20, and a plurality of bolts 25 (five in the present embodiment, only three are shown in FIG. 4) pass through the flange portion 23 in this state. It is screwed into the screw hole 37 of the cylinder head 30 while being inserted through the hole 24.

  Hereinafter, the operation of providing the airflow control valve 40 as described above will be described with reference to FIG. FIG. 6 shows an enlarged cross-sectional structure of the internal combustion engine 10 and the intake passage 11 around the valve element 41 of the airflow control valve 40.

  In the present embodiment, as shown in FIG. 6, the bearing portion 44 of the airflow control valve 40 is an opposing surface on the cylinder head 30 side among the opposing surfaces at the joint between the intake manifold 20 and the cylinder head 30 in the intake passage 11. It is press-fitted and fixed to the (wall portion 35). As a result, the assembly 45 including the rotation shaft 43, the bearing portion 44, and the valve body 41 of the airflow control valve 40 is directly attached to the joint of the intake passage 11. Therefore, such an intermediate member is not provided in comparison with the configuration of the comparative example in which the intermediate member for supporting the rotating shaft, the bearing portion, and the valve body is provided between the cylinder head and the intake manifold in the intake passage. Therefore, the intake device of the internal combustion engine 10 has a simple structure. Moreover, prior to connecting the cylinder head 30 and the intake manifold 20 to each other, the assembly 45 (specifically, its bearing portion 44) is press-fitted and fixed to the cylinder head 30. Therefore, the assembly 45 is not detached in the third step (see FIG. 4) for connecting the cylinder head 30 and the intake manifold 20 to each other, and the operation for the connection can be easily performed. Therefore, the intake manifold 20 and the airflow control valve 40 can be easily assembled to the cylinder head 30, and the intake device of the internal combustion engine 10 can be easily assembled.

  Further, in the present embodiment, since it is not necessary to provide an intermediate member unlike the configuration of the comparative example, the structure around the connection portion between the cylinder head 30 and the intake manifold 20 can be made compact.

  Furthermore, in this embodiment, since the partition wall 34 and the valve body 41 of the airflow control valve 40 are both provided in the cylinder head 30, the intake device including the airflow control valve 40 and the airflow control valve 40 are not provided. The same intake manifold 20 can be employed for the intake device, and parts can be shared.

  Here, in the present embodiment, the vibration of the internal combustion engine 10 that is caused by the operation of the internal combustion engine 10 is transmitted from the cylinder head 30 to the intake manifold 20. Specifically, the vibration amplitude and period are different. Moreover, since the weight of the intake manifold 20 is large, the difference between the vibration mode of the cylinder head 30 and the vibration mode of the intake manifold 20 tends to increase due to the influence of inertia. Therefore, if the partition wall 34 is formed in the cylinder head 30 and the valve body 41 of the airflow control valve 40 is attached to the intake manifold 20, the difference is caused between the vibration mode of the intake manifold 20 and the vibration mode of the cylinder head 30. As a result, the positions of the partition wall 34 and the valve body 41 may be displaced. If the position of the partition wall 34 and the valve body 41 is shifted as described above, a step is generated at the boundary portion between the partition wall 34 and the valve body 41 or the step is increased, thereby smoothing the intake air. The flow is obstructed.

  In the present embodiment, the intake manifold 20 and the cylinder head 30 are formed of materials having different coefficients of thermal expansion, such as the intake manifold 20 is formed of a resin material and the cylinder head 30 is formed of a metal material. Has been. Therefore, the amount of thermal expansion due to the temperature rise accompanying the operation of the internal combustion engine 10 differs between the intake manifold 20 and the cylinder head 30. Therefore, if the partition wall 34 is formed in the cylinder head 30 and the valve body 41 of the airflow control valve 40 is attached to the intake manifold 20, the partition wall 34 and the valve body 41 are caused by the difference in the amount of thermal expansion. There is a possibility that the smooth flow of the intake air may be hindered by the displacement of the position.

  In this regard, in the present embodiment, the partition wall 34 and the valve body 41 of the airflow control valve 40 are both provided in the cylinder head 30. Therefore, a step is generated at the boundary portion between the partition wall 34 and the valve body 41 due to a difference in vibration mode and a difference in thermal expansion between the intake manifold 20 and the cylinder head 30, and the step is increased. Can be suppressed, and a smooth flow of intake air is realized.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) The bearing portion 44 of the airflow control valve 40 is press-fitted and fixed to the opposing surface on the cylinder head 30 side among the opposing surfaces at the joint between the intake manifold 20 and the cylinder head 30 in the intake passage 11. Therefore, compared to the configuration of the comparative example, the intake device of the internal combustion engine 10 has a simple structure as long as the intermediate member is not provided. In addition, when the cylinder head 30 and the intake manifold 20 are connected to each other, the assembly 45 is not detached, and the operation for the connection can be easily performed. Therefore, the intake manifold 20 and the airflow control valve 40 can be easily assembled to the cylinder head 30, and the intake device of the internal combustion engine 10 can be easily assembled.

  (2) Since both the partition wall 34 and the valve element 41 of the airflow control valve 40 are provided in the cylinder head 30, the partition wall is caused by the difference between the vibration mode of the intake manifold 20 and the vibration mode of the cylinder head 30. It can suppress that a level | step difference arises in the boundary part of 34 and the valve body 41, and the level | step difference becomes large, and can implement | achieve the smooth flow of intake air.

  (3) Since both the partition wall 34 and the valve body 41 of the airflow control valve 40 are provided in the cylinder head 30, the difference between the thermal expansion amount of the intake manifold 20 and the thermal expansion amount of the cylinder head 30 is caused. It is possible to suppress the occurrence of a step at the boundary portion between the partition wall 34 and the valve body 41 and the increase in the step, thereby realizing a smooth flow of intake air.

The embodiment described above may be modified as follows.
-You may employ | adopt the cylinder head formed with metal materials other than an aluminum alloy.
-It is also possible to adopt an intake manifold formed of a metal material.

-An intake manifold and a cylinder head formed of the same material can be used.
The bearing portion 44 of the airflow control valve 40 may be press-fitted and fixed to the opposing surface on the intake manifold 20 side among the opposing surfaces at the joint between the intake manifold 20 and the cylinder head 30 in the intake passage 11.

The airflow control valve can be provided at the joint of the intake passage upstream of the connection portion instead of being provided at the connection portion between the cylinder head and the intake manifold.
The present invention relates to an intake device for an internal combustion engine provided with an air flow control valve for forming a swirl flow if the air flow control valve for changing the flow mode of intake air is provided in the intake passage. It can also be applied to an intake device of an internal combustion engine or the like provided with an air flow control valve for changing the effective length of the intake passage in a variable intake system.

  The present invention can be applied not only to a four-cylinder internal combustion engine, but also to a 1-3 cylinder internal combustion engine or an internal combustion engine having five or more cylinders.

1 is a schematic diagram showing a schematic configuration of an internal combustion engine to which an intake device according to an embodiment embodying the present invention is applied. The fragmentary sectional view which shows the internal structure of the air intake device concerning the embodiment. The disassembled perspective view which shows the disassembled perspective structure of the internal combustion engine and the intake passage in the periphery of the airflow control valve. The flowchart which shows the execution procedure of the assembly operation | work of the intake device of an internal combustion engine. Sectional drawing which expands and shows the cross-section of the internal combustion engine in the periphery of a bearing part. Sectional drawing which expands and shows the cross-section of the internal combustion engine and intake passage in the periphery of a valve body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 10a ... Cylinder, 11 ... Intake passage, 12 ... Intake pipe, 13 ... Exhaust passage, 14 ... Exhaust manifold, 15 ... Exhaust pipe, 16 ... Branch pipe, 17 ... Exhaust port, 18 ... Combustion chamber, 20 ... intake manifold (upstream member), 21 ... branch pipe, 22 ... gasket, 22a ... surrounding part, 22b ... connection part, 23 ... flange, 24 ... through hole, 25 ... bolt, 30 ... cylinder head (downstream member) , 31 ... intake port, 32 ... branch port, 33 ... branch passage, 34 ... partition wall, 35 ... wall portion, 36 ... opening, 37 ... screw hole, 38 ... mounting groove, 40 ... airflow control valve, 41 ... valve Body, 42 ... Actuator, 43 ... Rotating shaft, 44 ... Bearing part, 45 ... Assembly.

Claims (6)

In an intake device for an internal combustion engine in which an airflow control valve for changing a flow mode of intake air is provided in an intake passage,
The intake passage is formed by connecting an upstream member constituting a portion upstream of the intake flow direction and a downstream member constituting a portion downstream of the intake flow direction,
The air flow control valve includes a bearing portion that supports a rotating shaft in a rotatable state, and a valve body fixed to the rotating shaft in a state exposed to the inside of the intake passage. An intake device for an internal combustion engine, wherein a bearing portion is press-fitted and fixed to one of the opposing surfaces of a joint between the upstream member and the downstream member in the intake passage. The intake device for an internal combustion engine according to claim 1,
The downstream member has a partition wall that partitions the interior into a plurality of branch passages,
The air flow control valve is provided so that one end of the valve body is connected to the partition wall so as to partition the inside of the intake passage into a plurality of branch passages together with the partition wall, and the plurality of branches It is for changing the inflow mode of the air into the passage, and the bearing portion is press-fitted and fixed to the opposing surface of the downstream member among the opposing surfaces. An intake device for an internal combustion engine. The intake device for an internal combustion engine according to claim 2,
The upstream member is an intake manifold,
The intake member for an internal combustion engine, wherein the downstream member is a cylinder head. The intake device for an internal combustion engine according to claim 2 or 3,
The intake device for an internal combustion engine, wherein the upstream member and the downstream member are formed of materials having different coefficients of thermal expansion. The intake device for an internal combustion engine according to any one of claims 1 to 4,
The air flow control valve is for forming a spiral flow in a combustion chamber of the internal combustion engine. A method for manufacturing an intake device for an internal combustion engine according to any one of claims 1 to 5,
A first step of forming an assembly including the pivot shaft, the bearing portion, and the valve body;
A second step of press-fitting and fixing the bearing portion in the assembly to one of the opposing surfaces;
And a third step of fixing the upstream side member and the downstream side member to each other.

Images