JP2010077924A - Intake control device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake control device capable of inhibiting air leak from a gap other than an opening part attributed to an air stream control valve as much as possible. <P>SOLUTION: Since a cartridge 30 is formed out of elastic metal material, an axial part end 21b of a shaft fitting part 21 is fitted under a condition where sidewalls 31c are energized to mutually get close. Consequently, the gap at a side of a valve 22 gets small and air leak from the gap is inhibited. Even if the gap at the side of the valve 22 gets small, oscillation of the valve 22 is prevented from being disturbed by interference. Namely, reduction of the gap at the side of the valve 22 and inhibition of increase of operation force of the valve 22 are compatibly materialized by forming the cartridge 30 out of elastic material. As a result, air leak from the gap other than the opening part of a valve unit 20 is inhibited as much as possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, an airflow control valve is provided in the intake pipe that introduces intake air into the combustion chamber of an internal combustion engine. The flow of intake air in the intake passage formed in the intake pipe is controlled to generate a tumble flow in the combustion chamber. Inhalation devices are known.
In such an intake device, a rotatable valve shaft is provided so as to straddle one inner wall of the intake pipe and the other inner wall facing the inner wall, and a valve body fixed to the valve shaft is inhaled by rotation of the valve shaft. Change the opening cross-sectional area of the passage.

  The structure of the airflow control valve and the intake pipe is often complicated. Therefore, it may be difficult to attach the airflow control valve to the intake pipe. Therefore, in recent years, the airflow control valve bearing is formed on a bearing member separate from the intake pipe, and the airflow control valve is attached to the bearing member in advance, and then the bearing member is attached to the intake pipe, thereby simplifying the assembly process. A technique for achieving this is disclosed (for example, see Patent Document 1).

Special table 2003-509634

In order to generate a strong tumble flow, it is important to concentrate the flow of the intake air efficiently before guiding it to the combustion chamber, and reduce air leakage that occurs outside the opening where the intake air is to be guided. However, it is raised as an issue.
However, the technique described in Patent Document 1 is not sufficient from the viewpoint of reducing air leakage that occurs outside such an opening.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an intake control device that can suppress air leakage from a gap other than the opening by the airflow control valve as much as possible. .

The intake control device according to claim 1 made to solve the above-described problem is provided in an intake pipe for introducing intake air into a combustion chamber of an internal combustion engine. This intake control device includes a valve shaft, an airflow control valve, and a cylindrical elastic member. The valve shaft is provided so as to traverse the inside of the intake pipe perpendicular to the intake air introduction direction. The airflow control valve includes a shaft portion and a valve body, and the shaft portion is supported by the valve shaft. On the other hand, the valve body extends from the shaft portion to be swingable about the valve shaft as a rotation center.
Here, particularly in the present invention, there is provided a cylindrical elastic member having a side wall having a biasing force that is elastically close to the side surfaces of the valve body and a flange portion that is bent toward the outside. The airflow control valve is rotatably held, and is arranged so that the inner wall of the intake pipe passage and the side wall of the cylindrical elastic member do not contact each other.

  In this way, since the side surface of the valve body is sandwiched by the side walls that are urged so as to be close to each other due to elasticity, the gap formed on the side of the valve body can be further reduced. In addition, even if the intake pipe passage is deformed due to temperature or the like at this time, since the side surface of the valve body is sandwiched by elasticity, it is possible to prevent the operating force of the valve body from significantly increasing due to interference. In other words, the cylindrical member that holds the airflow control valve is made of an elastic material to achieve both “reducing the lateral clearance of the valve element” and “suppressing the increase in operating force of the valve element”. It was made to. As a result, it is possible to suppress air leakage from a gap other than the opening due to the airflow control valve as much as possible.

  In the intake control device according to the second aspect, the cylindrical elastic member has a notch that facilitates elastic deformation in a part of the cylindrical side wall portion. In this way, since the elastic deformation becomes easier, the above-described effects are conspicuous.

  By the way, it is known that resin molding is less accurate than metal cutting. Therefore, conventionally, it has been difficult to mold the valve body with resin. On the other hand, in the present invention, since a highly accurate molding technique is not required, as shown in claim 3, the air flow control valve may be molded with resin.

  In the intake control device according to the first aspect, the cylindrical elastic member has a flange portion formed by bending an end edge portion toward the outside. If it does in this way, a cylindrical elastic member can be easily positioned with respect to an intake pipe, for example by pinching a collar part.

  With regard to this collar part, as shown in claim 4, the collar part may be composed of a collar piece divided by a notch. At this time, the bending angle of the flange piece is made different. If it does in this way, a collar part can fully be pinched | interposed, for example between intake pipes by the elasticity of a collar piece.

  From the viewpoint of sandwiching the flange portion, for example, as shown in claim 5, it is exemplified that the frame member is configured to hold the flange portion in the suction direction between the step portion in the intake pipe. In this case, if the frame member has a fitting portion that protrudes and fits inside the inner wall of the cylindrical side wall portion, air leakage from the bent portion of the collar portion can be effectively suppressed. . In particular, when the collar portion is composed of a collar piece, the air leaking from the notch can be effectively suppressed.

  In the intake control device according to claim 6, the cylindrical elastic member is disposed between a first member having a U-shape in sectional view having a side wall and an end portion of the first member, and the first elastic member is a cylinder together with the first member. And a second member forming a side wall portion. Thus, if a cylindrical side wall part is formed with two members, the elastic deformation of a cylindrical side wall part can be made easy.

Hereinafter, an intake control device according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing an intake control device 1 of the present embodiment. FIG. 2 is an exploded perspective view showing the intake control device 1 of the present embodiment.
The intake control device 1 is disposed at the downstream end of an intake manifold that introduces air from outside into the combustion chamber. Specifically, it is arranged at a position where the engine head is connected to the intake manifold. In FIG. 1, the intake pipe 11 forms the downstream end of the intake manifold. An intake passage 13 is formed in the intake pipe 11 (see FIG. 4). A shaft 12 as a “valve shaft” is provided across the intake passage 13.

The intake control device 1 includes a valve unit 20 as an “airflow control valve”, a cartridge 30 as a “tubular elastic member”, and a frame member 40.
As shown in FIGS. 1 and 2, the valve unit 20 includes a shaft fitting portion 21 as a “shaft portion” and a valve 22 as a “valve element”. The shaft fitting portion 21 is formed in a cylindrical shape, and the shaft 12 is inserted through the inside. That is, the shaft fitting portion 21 is supported by the shaft 12. The shaft fitting portion 21 has a shaft portion main body 21a whose longitudinal direction is the width direction of the intake passage 13 (see FIG. 4), and a shaft portion end 21b protruding from the end portion of the shaft portion main body 21a. A valve 22 extends from the shaft body 21a. The valve 22 has the same width as the shaft body 21a. The valve 22 can swing around the shaft 12 as a rotation center. In the present embodiment, the valve unit 20 is formed of a resin material.

  The cartridge 30 is formed of a metal material having elasticity, for example, SUS304, and includes a main body portion 31 as a “cylindrical side wall portion”, a bearing portion 32, and a flange 33 as a “ridge portion”. When viewed from the downstream side (in the direction indicated by the arrow M in FIG. 2), the main body 31 has a cylindrical shape with rounded corners 31a and 31b as shown in FIG. However, as can be seen from FIG. 2, the portion close to the downstream side is U-shaped in sectional view. This portion includes side walls 31c and upper walls 31d on both sides. In a portion close to the upstream side, a bottom wall 31e is provided between both side walls 31c. The bottom wall 31e is provided so as to be bent substantially vertically inward from the side wall 31c. Thereby, the end 31f overlaps at the center in the width direction of the intake pipe. This is as shown in FIG. FIG. 3B is an enlarged explanatory view of a portion indicated by a symbol C in FIG. That is, the cartridge 30 has a cut in a part of its cylindrical side wall portion. With this configuration, the elastic deformation in the width direction of the cartridge 30 is facilitated.

  The side wall 31c has a notch that opens to the downstream side at a portion corresponding to the bottom wall 31e, and this notch constitutes a bearing portion 32 (see FIG. 2 and the like). The bearing portion 32 is a notch having a circular arc shape at a deep portion capable of supporting the shaft end 21 b of the shaft fitting portion 21.

  The flange 33 is formed by bending the upstream end portions of the side wall 31c and the upper wall 31d outward. As shown in FIG. 3A, the flange 33 is composed of a plurality of flanges 33b divided by notches 33a. In addition, the flange pieces 33b include those having a slightly larger bending angle than 90 degrees and those having a slightly smaller bending angle, and the flange pieces 33b having different bending angles are arranged alternately.

  As shown in FIG. 2, the frame member 40 includes a front frame 41 disposed on the downstream side and a rear frame 42 disposed on the upstream side. The front frame 41 has a recess 41a in which the flange 33 of the cartridge 30 can be accommodated during assembly. In addition, a fitting portion 41b that protrudes and fits inside the main body portion 31 of the cartridge 30 is provided inside the concave portion 41a. The fitting portion 41 b is loosely fitted to the main body portion 31 of the cartridge 30. On the other hand, the rear frame 42 has a pressing portion 42 a that protrudes corresponding to the front frame 41. The front frame 41 is pressed by the end surface 42b of the pressing portion 42a.

  Next, the configuration when the intake control device 1 is assembled will be described in more detail. FIG. 4 is a front view of the intake control device 1 attached to the intake passage 13 inside the intake pipe 11. 5 is a schematic cross-sectional view taken along the line VV of FIG. 4, and FIG. 6 is a schematic cross-sectional view taken along the line VI-VI of FIG.

  First, as described above, the shaft unit body 21 a of the valve unit 20 is supported by the shaft 12. Thereby, the valve 22 forms the flow path 14 together with the main body portion 31 of the cartridge 30, and the opening cross-sectional area of the flow path 14 can be appropriately changed. For example, FIG. 6 shows a fully opened state of the valve unit 20, and FIG. 7 shows a fully closed state.

  A bearing portion 32 of the cartridge 30 is slidably fitted to and supported by the valve unit 20 from the upstream side. At this time, since the cartridge 30 is formed of an elastic metal material, the shaft end 21b of the shaft fitting portion 21 is fitted in a state where the side walls 31c are biased so as to approach each other. In this state, the cartridge 30 is attached to the intake pipe 11.

  In the cartridge 30, a flange 33 erected at the upstream end is disposed in the recess 41 a of the front frame 41 and is pressed between the stepped portion 15 of the intake pipe 11 by the rear frame 42. At this time, the fitting portion 41 b protruding from the front frame 41 loosely fits inside the cartridge 30.

  As described above in detail, in the intake control device 1 of the present embodiment, since the cartridge 30 is formed of a metal material having elasticity, the shaft fitting is performed in a state where the side walls 31c are biased to be close to each other. The shaft part end 21b of the part 21 is fitted. As a result, the gap on the side of the valve 22 is reduced, and air leakage from this gap can be suppressed.

  Further, even if the intake pipe passage is deformed due to temperature or the like, the operating force of the valve 22 can be prevented from greatly increasing due to interference because the side surface of the valve 22 is sandwiched. In other words, by forming the cartridge 30 from an elastic material, both “reducing the gap on the side of the valve 22” and “suppressing an increase in the operating force of the valve 22” are achieved. As a result, air leakage from a gap other than the opening by the valve unit 20 can be suppressed as much as possible.

  In the present embodiment, the side wall 31 c has a notch that opens to the downstream side, and this notch constitutes the bearing portion 32. With this configuration, the bearing portion 32 of the cartridge 30 is slidably fitted to and supported by the valve unit 20 from the upstream side. Thereafter, the cartridge 30 to which the valve unit 20 is attached is assembled to the intake pipe 11. This facilitates the assembly of the valve unit 20.

  Furthermore, in the present embodiment, the bottom wall 31e is provided between the side walls 31c at a portion close to the upstream side of the cartridge 30, but the end 31f of the bottom wall 31e extends in the width direction of the intake pipe. It overlaps at the center (see FIG. 3B). That is, the cartridge 30 has a cut in a part of its cylindrical portion. Thereby, the elastic deformation in the width direction of the cartridge 30 is facilitated, and the above-described effects stand out.

  By the way, it is known that resin molding is less accurate than metal cutting. Therefore, conventionally, when strong tumble is required, it is difficult to mold the valve unit 20 with resin. On the other hand, in this embodiment, since the elastic deformation of the cartridge 30 is used for suppressing air leakage, a highly accurate molding technique is not required. Therefore, it is possible to mold the valve unit 20 with resin and generate strong tumble.

  In the present embodiment, the flange 33 is formed by bending the upstream end of the main body 31 outward. And it is comprised by the some flange piece 33b divided by the notch 33a, and the flange piece 33b from which a bending angle differs is arranged in a staggered manner. As a result, the flange 33 erected at the upstream end can be sufficiently pressed between the stepped portion 15 of the intake pipe 11, positioning of the cartridge 30 is facilitated, and rattling is prevented. it can.

  Furthermore, the maze structure is formed in the recessed part 41a of the front frame 41 by arranging the flanges 33b having different bending angles alternately. As a result, air leakage can be effectively suppressed. Furthermore, since the fitting part 41b protruding from the front frame 41 is loosely fitted inside the cartridge 30, air leakage from the notch 33a of the flange 33 can be effectively suppressed.

(Second Embodiment)
FIG. 8 is a front view (seen from the downstream side) showing a state in which the intake control device 2 of the second embodiment is arranged in the intake pipe 11. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a schematic cross-sectional view taken along line XX in FIG.

  In the present embodiment, the valve unit 200 as an “airflow control valve” includes a shaft fitting portion 201 as a “shaft portion” and a valve 202 as a “valve body”, as in the above embodiment. The shaft fitting portion 201 is formed in a cylindrical shape, and the shaft 12 is inserted through the inside (see FIG. 9). That is, it is supported by the shaft 12 as a “valve shaft”. Further, the shaft fitting portion 201 has the shaft portion main body 201a and the shaft portion end 201b protruding from the end portion of the shaft portion main body 21a as in the above embodiment. Also in this embodiment, the valve unit 200 is formed of a resin material.

  The cartridge 300 as a “cylindrical elastic member” is formed of a metal material having elasticity, and includes a main body portion 301 as a “cylindrical side wall portion”, a bearing portion 302, and a flange 303 as a “ridge portion”. Have. When viewed from the downstream side, the main body 301 has a cylindrical shape as shown in FIG.

  The main body 301 has side walls 301c on both sides, an upper wall 301d that connects the upper ends of the side walls 301c, and a bottom wall 301e formed by folding back the lower ends of the side walls 301c. Accordingly, the bottom wall 301e partially overlaps at the center in the width direction of the intake pipe 101 (see FIG. 9 and the like). That is, also in this embodiment, the cartridge 300 has a cut in a part of its cylindrical side wall portion. Such a configuration facilitates elastic deformation of the cartridge 300 in the width direction.

  The side wall 301 c has a notch that opens to the upstream side, and this notch constitutes the bearing portion 302. The bearing portion 302 has a circular arc-shaped notch at a deep portion that can support the shaft end 201 b of the shaft fitting portion 201. The flange 303 is formed by bending the downstream end portion outward. Furthermore, two splits 301g are formed on the side wall 301c from the upstream end to the downstream side.

  With this configuration, the valve 202 forms the flow path 140 together with the main body portion 301 of the cartridge 300, and the opening cross-sectional area of the flow path 140 can be changed as appropriate (see FIG. 10). The valve unit 200 is slidably fitted to and supported by the bearing portion 302 of the cartridge 300 from the upstream side. The cartridge 300 with the valve unit 200 fitted thereto is attached to the intake pipe 101 from the downstream side, and the flange 303 is sandwiched between the intake pipe 101 and the engine head.

According to this embodiment, the same effect as the above-mentioned embodiment is produced.
That is, since the cartridge 300 is formed of a metal material having elasticity, the shaft end 201b of the shaft fitting portion 201 is fitted in a state where the side walls 301c are biased so as to be close to each other. As a result, the gap on the side of the valve 202 is reduced, and air leakage from this gap can be suppressed. Further, it is possible to prevent the operating force of the swinging movement of the valve 202 from significantly increasing due to the interference. As a result, air leakage from a gap other than the opening by the valve unit 200 can be suppressed as much as possible.

  In the present embodiment, the side wall 301 c has a notch that opens to the upstream side, and this notch constitutes the bearing portion 302. With this configuration, the valve unit 200 is fitted and supported in a sliding manner with respect to the bearing portion 302 of the cartridge 300 from the upstream side. Such a cartridge 300 is attached to the intake pipe 101. This facilitates the assembly of the valve unit 200.

  Furthermore, in this embodiment, the cartridge 300 is provided with a bottom wall 301e between both side walls 301c, but the end 301f of the bottom wall 301e overlaps at the center in the width direction of the intake pipe 101. . As a result, the elastic deformation in the width direction of the cartridge 300 is facilitated, and the above-described effects stand out. In addition, also in this embodiment, since accuracy is not required, the valve unit 200 can be formed of resin.

  In the present embodiment, the flange 303 is formed by bending the downstream end of the main body 301 outward. Accordingly, the flange 303 can be sufficiently pressed down by the intake pipe 101 and the engine head, and the cartridge 300 can be easily positioned.

  Furthermore, in this embodiment, a split 301g from the upstream side is provided on the side wall 301c of the main body 301 of the cartridge 300. As a result, the side wall 301c is elastically deformed outward by the pressure of the flow path 140 and is pressed against the inner wall of the intake pipe 101. Therefore, rattling of the cartridge 300 can be effectively suppressed.

(Third embodiment)
FIG. 11 is a front view (viewed from the downstream side) showing a state in which the intake control device 3 of the third embodiment is arranged in the intake pipe 111. 12 is a schematic sectional view taken along line XII-XII in FIG.

This embodiment is particularly characterized in the configuration of the cartridge 310 as a “tubular elastic member”. Therefore, the configuration of the cartridge 310 will be described below.
The cartridge 310 is formed of a metal member having elasticity, and includes a main body portion 311 as a “cylindrical side wall portion”, a bearing portion 312, and a flange 313 as a “ridge portion”. Here, in particular, the main body 311 is composed of two members, a first main body 311a as a “first member” and a second main body 311b as a “second member”.

  As shown in FIG. 13A, the first main body 311a has an inner wall 311c and an upper wall 311d. And the bearing part 312 and the split 311g are provided in the inner wall 311c. However, the 1st main-body part 311a does not have a bottom wall, but becomes cross-sectional view U shape (refer FIG. 11). The second main body portion 311b replaces the bottom walls 31e and 301e in the above embodiment.

  As shown in FIG. 13B, the second main body 311b is formed by bending a member made of a metal material having elasticity, and is disposed below the valve unit 200 as an “air flow control valve” when assembled. The bottom portion 311h and the inclined portion 311i that inclines so as to narrow the flow path 140 from the bottom portion 311h toward the downstream side. The end portion of the inclined portion 311i is bent downward, and the center portion and the side portion are further bent to the bottom 311h side at different heights to form bent portions 311j and 311k. With this configuration, the second main body portion 311b is attached so as to sandwich the sandwiched portion 115 formed at the downstream end portion of the intake pipe 111.

According to this embodiment, the same effect as the above-mentioned embodiment is produced.
That is, since the cartridge 310 is formed of an elastic metal material, the shaft portion end 201b of the shaft fitting portion 201 is fitted in a state where the side walls 311c are biased so as to be close to each other. As a result, the gap on the side of the valve 202 is reduced, and air leakage from this gap can be suppressed. Further, it is possible to prevent the operating force of the swinging movement of the valve 202 from being significantly increased due to the interference on the side of the valve 202. As a result, air leakage from a gap other than the opening by the valve unit 200 can be suppressed as much as possible.

  In the present embodiment, the side wall 311 c has a notch that opens to the upstream side, and this notch constitutes the bearing portion 312. With this configuration, the valve unit 200 is fitted and supported in a sliding manner with respect to the bearing portion 312 of the cartridge 310 from the upstream side. Such a cartridge 310 is attached to the intake pipe 111. This facilitates the assembly of the valve unit 200.

  Furthermore, in the present embodiment, the flange 313 is formed by bending the downstream end of the first main body 311a outward. Accordingly, the flange 313 can be sufficiently pressed by the intake pipe 111 and the engine head, and the positioning of the cartridge 310 is facilitated.

  In the present embodiment, a split 311g from the upstream side is provided on the side wall 311c of the first main body 311a of the cartridge 310. Thus, the side wall 311c is elastically deformed outward by the pressure of the flow path 140 and is pressed against the inner wall of the intake pipe 111, so that the play of the cartridge 310 can be effectively suppressed.

  Furthermore, in this embodiment, the 1st main-body part 311a does not have a bottom wall, but becomes cross-sectional view U shape (refer FIG. 11). As a result, the elastic deformation in the width direction of the cartridge 310 is facilitated, and the above-described effects stand out. Further, the second main body portion 311b includes an inclined portion 311i that is inclined so as to narrow the flow path 140 from the bottom portion 311h toward the downstream side. Thereby, air leakage in the space below the valve 202 of the valve unit 200 can be suppressed. Further, bent portions 311j and 311k are formed on the downstream side of the second main body portion 311b, and the two bent portions 311j and 311k sandwich the sandwiched portion 115 of the intake pipe 111. As a result, the second main body 311b is also easily positioned.

  As mentioned above, this invention is not limited to the said embodiment at all, In the range which does not deviate from the meaning of invention, it can implement with a various form.

1 is a perspective view showing an intake control device according to a first embodiment of the present invention. It is a disassembled perspective view which shows the intake control device of 1st Embodiment of this invention. (A) is a front view of the cylindrical elastic member of 1st Embodiment, (b) is an expanded explanatory view of the part shown by the symbol C of (a). It is a front view which shows the intake control device of 1st Embodiment of this invention. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a schematic sectional view taken along line VI-VI in FIG. 4. It is a schematic sectional drawing which shows the state by which the airflow control valve was fully closed. It is a front view which shows the intake control device of 2nd Embodiment of this invention. It is the IX-IX line schematic sectional drawing of FIG. FIG. 9 is a schematic sectional view taken along line XX in FIG. 8. It is a front view which shows the intake control device of 3rd Embodiment of this invention. It is the XII-XII line schematic sectional drawing of FIG. It is explanatory drawing which shows the structure of the main-body part of the cylindrical elastic member of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2, 3 ... Intake control apparatus 11, 101, 111 ... Intake pipe, 12 ... Shaft (valve shaft), 13 ... Intake passage, 14, 140 ... Flow path, 15 ... Step part, 20, 200 ... Valve unit (Airflow control valve), 21, 201 ... Shaft fitting part (shaft part), 21a, 201a ... Shaft body, 21b, 201b ... Shaft end, 22, 202 ... Valve (valve element), 30, 300, 310 ... cartridge (cylindrical elastic member) 31, 301, 311 ... main body (cylindrical side wall), 311a ... first main body (first member), 311b ... second main body (second member), 31a, 31b ... Corner part, 31c, 301c, 311c ... Side wall, 31d, 301d, 311d ... Upper wall, 31e, 301e ... Bottom wall, 31f, 301f ... End part, 311h ... Bottom part, 311i ... Inclined part, 311i, 311j ... Fold Song Part, 32, 302, 312 ... bearing part, 33, 303, 313 ... flange (saddle part), 33a ... notch, 33b ... scissor piece, 40 ... frame member, 41 ... front frame, 41a ... recessed part, 41b ... fitting Joint part, 42 ... rear frame, 42a ... pressing part, 42b ... end face, 115 ... sandwiched part

Claims (6)

Provided in the intake pipe for introducing air into the combustion chamber of the internal combustion engine,
A valve shaft provided across the intake pipe perpendicular to the air introduction direction;
A shaft portion supported by the valve shaft, and an airflow control valve having a valve body extending from the shaft portion so as to be swingable about the valve shaft as a rotation center;
A cylindrical side wall portion including a side wall sandwiching the air flow control valve having an urging force so as to be elastically close to the valve body side surface of the air flow control valve, and an edge portion toward the outside. And a cylindrical elastic member having a bent flange, and is arranged so that the inner wall of the passage of the intake pipe and the side wall of the cylindrical elastic member are not in contact with each other. .   The intake control device according to claim 1, wherein the cylindrical elastic member has a notch that facilitates elastic deformation in a part of the cylindrical side wall portion.   The intake control device according to claim 1, wherein the airflow control valve is formed of resin.   The flange portion is composed of a flange piece divided by a notch, and changes the bending angle of the flange piece so as to have an urging force elastically close to the shaft portion or the valve shaft. The intake control device according to any one of claims 1 to 3, wherein   It comprises a frame member having a fitting portion that presses the flange in the air introduction direction between the stepped portion in the intake pipe and protrudes and fits inside the inner wall of the cylindrical side wall portion. The intake control device according to claim 4.   The cylindrical elastic member is disposed between a first member having a U-shaped cross-sectional view having the side wall and an end of the first member, and forms a cylindrical side wall portion together with the first member. The intake control device according to claim 1, further comprising a member.

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