JP2007192094A - Intake device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device capable of controlling intake air flows in a wide range by using a butterfly type intake air flow control valve. <P>SOLUTION: The intake device 1A for an internal combustion engine is provided with an intake air flow control valve 10 adjusting intake air flow GS flowing in an intake air passage 3 by pivotally supporting a plate shape valve element 11 at a side center position and rotating the same. The valve element 11 is formed of an elastically deformable member, and provided in such a manner that one end of the valve element 11 can abut on the inner wall 3WA of the intake air passage 3 when one end of the valve element 11 is rotated to a predetermined position of the valve element 11. Consequently, one end of the valve element 11 block one end side of the intake air passage 3, and the valve element 11 deforms in a state that one end side of the intake air passage 3 is blocked to adjust a passage area of the other end side of the intake air passage 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intake device including an intake flow control valve for controlling an intake flow flowing in an intake passage.

  Conventionally, a plurality of proposals have been made for an intake device provided with an intake flow control valve that generates a vortex flow (or also called a swirl flow) in the intake passage. The generated vortex flows include a vertical vortex flow called a tumble flow and a horizontal vortex flow called a swirl flow. By controlling the generation of these vortex flows on the intake device side, it is possible to improve the combustion efficiency in the cylinder of the internal combustion engine, and to improve fuel consumption and emissions.

  For example, Patent Document 1 discloses two types of intake devices having different valve bodies. The first type of intake device adjusts the amount of tumble flow by driving an intake flow control valve composed of one valve element in a stepwise manner. The second type of intake device uses an intake flow control valve constituted by two valve bodies that can be independently driven. This second type of intake device also mainly adjusts the amount of tumble flow generated by changing the opening of the valve body. Further, both the intake devices are provided with a notch in the valve body so that a swirl flow can be formed. Therefore, this intake device can adjust the generated vortex over a wide range.

JP 11-336552 A

  Incidentally, in the first type of intake device disclosed in Patent Document 1, an intake flow control valve generally called a butterfly valve is employed. The butterfly valve has intermediate shafts on both sides of a plate-like valve element disposed in an intake passage (intake pipe). The butterfly valve has an intermediate shaft supported by a bearing and rotates like a seesaw to adjust the opening of the intake passage. FIG. 9 is a view showing a conventional general intake device 100 employing a butterfly valve. The butterfly valve 101 rotates about the intermediate shaft 102. FIG. 9A shows a closed state in which the flow path is most narrowed by the butterfly valve 101, FIG. 9B shows a half-open state, and FIG. 9C shows a full-open state. As shown in FIG. 9A, the intake device 100 has a lower side so that the lower side in the intake passage is closed by the butterfly valve 101 and a narrow flow path is left on the upper side (closed state). A dead volume (recessed portion) 104 is provided on the inner wall 103 of the main body.

  However, if the dead volume 104 exists as described above, the intake resistance increases when the butterfly valve 101 is laid along the intake flow GS and fully opened as shown in FIG. 9C. Therefore, the intake device having a dead volume in the intake passage has a problem that the output performance is lowered due to insufficient intake amount when fully opened. The first type of intake device disclosed in Patent Document 1 has the same problem because it has the same structure as the intake device shown in FIG.

  Moreover, the 2nd type intake device disclosed by patent document 1 is provided with the intake flow control valve which drives two valve bodies independently. However, this intake flow control valve has a structure in which a butterfly valve is formed by two divided valve bodies. Also in the case of this intake device, a dead volume is provided on the lower inner wall so that a closed state can be formed. Therefore, the same problem that the intake air amount decreases when fully opened occurs.

  It should be noted that a cantilever valve can be adopted as the intake device in place of the butterfly valve described above. The cantilever valve is a valve that adjusts the opening degree of the flow path by pivotally supporting one end of the plate-like member. FIG. 10 is a view showing a conventional general intake device 110 that employs a cantilever valve as an intake flow control valve. FIG. 10 also shows a closed state where the flow path is most restricted by the cantilever valve 111 in (A), a half-open state in (B), and a fully-open state in (C).

  In the cantilever valve 111, the moment applied to the shaft 112 increases, so the drive motor becomes larger. Further, the inner wall 113 below the intake passage is provided with a recess 114 for retracting the cantilever valve 111 when fully opened, and therefore, a part of the exhaust gas and fuel tends to accumulate as an adhesive deposit 115 in the recess 114. As shown in FIG. 10C, when the deposit 115 adheres to the cantilever valve 111, the operation is hindered. Therefore, since the intake device using the cantilever valve has a problem in terms of reliability, it is desirable to use a butterfly valve as the intake flow control valve.

  An object of the present invention is to solve the above-described conventional problems and provide an intake device that can control an intake flow over a wide range using a butterfly-type intake flow control valve.

  An object of the present invention is to provide an intake device for an internal combustion engine including an intake air flow control valve that adjusts an intake air flow that flows in an intake passage by pivotally supporting a side intermediate position of a plate-like valve body. The valve body is formed of an elastically deformable member, and one end of the valve body is disposed so as to be able to contact the inner wall of the intake passage when the valve body is rotated to a predetermined position. Accordingly, one end portion of the valve body closes one end side of the intake passage, and the valve body deforms in a state where one end side of the intake passage is closed, whereby the passage area on the other end side of the intake passage This can be achieved by an intake device for an internal combustion engine that adjusts the pressure.

  According to the present invention, the valve body is formed of an elastically deformable member, and the valve body itself is elastically deformed when the valve body rotates and one end abuts against the inner wall of the intake passage. There is no need to provide a dead volume as in the apparatus. Further, the intake flow can be guided in a flat shape when no external force acts on the valve body. Therefore, since this intake device can change the intake passage area in multiple stages, the intake flow can be controlled over a wide range and the combustion efficiency of the internal combustion engine can be improved. In addition, since there is no dead volume in the intake passage, the intake flow rate does not decrease when fully opened. Therefore, a high output can be obtained from the internal combustion engine.

  And the said valve body may be formed with the rubber | gum which elastically deforms in a predetermined position, and may employ | adopt the structure where the core material is embed | buried under the predetermined position in an elastic member.

  The valve body is formed by a first valve body portion and a second valve body portion, and a spring is interposed between the first valve body portion and the second valve body portion, and the spring is the valve body. A structure provided between the intermediate position and the end of the valve body contacting the intake passage may be adopted.

  In addition, if the valve body is formed so that a predetermined gap is formed between the other end portion and the inner wall of the intake passage when the one end portion contacts the inner wall of the intake passage, The flow can be squeezed to form a fast vortex.

  In addition, the said intake device can generate a tumble flow and a swirl flow by changing the position which pivotally supports a valve body suitably.

  ADVANTAGE OF THE INVENTION According to this invention, the intake device which can control an intake flow over a wide range using a butterfly type intake flow control valve can be provided. In particular, since there is no dead volume in the intake passage, the intake flow rate does not decrease when the intake passage is fully opened. Therefore, it is possible to obtain a high output when applied to an internal combustion engine.

  Hereinafter, an intake device for an internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings.

  1A and 1B are diagrams illustrating an intake device 1A according to the first embodiment. FIG. 1A is an overall configuration diagram, and FIG. 1B is a diagram schematically illustrating an intake flow control valve 10 taken out. 1A of intake devices are arrange | positioned in the part which connects the cylinder side of an internal combustion engine not shown and an intake manifold. In FIG. 1, the lower end 2 is the cylinder side of the intake device 1A. The intake flow GS flows from the intake manifold side toward the cylinder as shown in the figure. In general, the intake passage (intake pipe) of the intake device is often formed in the cylinder head of the internal combustion engine, but the intake device according to the present invention is not limited to such a form. The intake passage may be a part of the intake manifold or a form existing as an independent pipe. The embodiment described below will be described without particularly limiting the place where the intake passage is provided.

  An intake flow control valve 10 is disposed at a predetermined position in the intake passage 3. The intake flow control valve 10 is a butterfly type. The intake flow control valve 10 includes a valve body 11 formed of a plate-like member and an intermediate shaft 12 provided at a side intermediate position of the valve body 11. The intermediate shaft 12 protrudes outward at both sides. The intermediate shaft 12 may be formed integrally with the valve body 11, or a recess may be provided in the valve body 11, and the intermediate shaft 12 may be inserted and fixed in this recess. In short, it is only necessary to realize a configuration in which the side intermediate position of the plate-like valve body 11 is pivotally supported. The side intermediate position is a position shifted from the central position of the side. Thus, by supporting the plate-like valve body 11 at a position shifted from the center position, a structure in which one end of the valve body 11 abuts against the inner wall 3WA of the intake passage 3 as described later is realized.

  The valve body 11 is disposed in the intake passage 3 and is sized so that the opening degree of the intake passage 3 can be changed when it rotates about the intermediate shaft 12. In this embodiment, the intake passage 3 has a substantially rectangular cross section, and the valve body 11 is also formed in a rectangular shape corresponding thereto. The valve body 11 is formed by an elastic member such as a leaf spring or a rubber material formed in a plate shape.

  The intermediate shaft 12 provided on the side of the valve body 11 is pivotally supported by a bearing 4 provided on the intake passage 3 side, as shown in FIG. Therefore, the intake flow control valve 10 is rotatable about the intermediate shaft 12. However, the length of the portion PL below the intermediate shaft 12 is set longer than the distance PD1 from the bearing 4 to the lower inner wall of the intake passage 3. Therefore, when the valve body 11 is in a posture in which it rises in the intake passage 3 (an posture that is nearly perpendicular to the intake flow GS), its lower end portion (one end portion) 13 comes into contact with the inner wall 3WA of the intake passage 3, Deforms to close the lower side.

  On the other hand, the length of the portion PH above the intermediate shaft 12 is set shorter than the distance PD2 from the bearing 4 to the upper inner wall of the intake passage 3. Therefore, when the intake flow control valve 10 rises in the intake passage 3, a predetermined gap 5 is formed between the upper end portion (the other end portion) 14 of the valve body 11 and the inner wall of the intake passage 3. The When the closed state is formed, the gap 5 becomes the most narrowed intake passage. Therefore, the clearance 5 may be set so that a desired intake flow GS can be obtained in the closed state.

  Further, the rotational force from the actuator 15 is transmitted to the intermediate shaft 12. The drive of the actuator 15 is controlled by an ECU (Electronic Control Unit) 16. The ECU 16 may also be used as an ECU that controls an internal combustion engine (not shown). In this case, the valve body 11 can be rotated to a desired position by controlling the actuator 15 according to the state of the internal combustion engine.

  The intake flow control valve 10 rotates the valve body 11 from a state where the flow passage in the intake passage 3 is opened (fully opened state) to a state where the intake flow GS is throttled (closed state). FIG. 1A shows a closed state in which the intake flow control valve 10 most restricts the intake flow GS leaving only the gap 5 on the upper side in the intake passage 3.

  When the closed state shown in FIG. 1A is formed, the lower end 13 of the valve body 11 contacts the inner wall 3WA of the intake passage 3. Here, the valve body 11 is formed of an elastic member such as a leaf spring. If the torque of the actuator 15 is set to a predetermined value in advance, as shown in FIG. 1B, the reaction force CP is received from the inner wall 3WA of the intake passage 3, so that the lower end 13 side of the valve body 11 bends (deforms). Will be). In this way, the intake flow control valve 10 bends the valve body 11 to close the lower intake flow. On the other hand, since the small gap 5 is formed on the upper end 14 side, the intake flow GS having a fast flow can be supplied downstream by reducing the intake amount. Therefore, a strong tumble flow TM can be formed in the cylinder.

  An injector mounting portion 7 is formed on the upper side of the intake passage 3 so as to protrude outward, and fuel is injected into the intake passage 3 from a tip portion 8a of the injector 8 inserted into the mounting portion 7. The Therefore, the subsequent intake flow GS is supplied into the cylinder as an air-fuel mixture containing fuel.

  2A and 2B are diagrams showing another state of the intake device 1A, in which FIG. 2A shows a half-open state, and FIG. In FIG. 2, the configuration of the intake device 1A is simplified as compared with FIG. When the valve body 11 is rotated counterclockwise from the closed state shown in FIG. 1, the fully opened state of (B) can be achieved via the half-opened state of (A). When the valve body 11 is in the half-open state and the full-open state, no external force is adopted for the valve body 11, so that the intake air flow GS is guided in a flat form.

  For example, if the intake flow control valve 10 is closed as shown in FIG. 1 when the internal combustion engine is cold-started, emission can be improved by generating a strong tumble flow with a reduced flow rate. If the intake flow control valve 10 is in the half-open state shown in FIG. 2A when the internal combustion engine is in a medium load state, a medium tumble flow can be generated to improve fuel efficiency. Furthermore, if the intake flow control valve 10 is fully opened as shown in FIG. 2B in a high load state, the output of the internal combustion engine can be improved by generating a weak tumble flow while ensuring a sufficient flow rate. Thus, the intake device 1A of the present embodiment can control the intake flow GS over a wide range according to the state of the internal combustion engine.

  As described above, since the valve body 11 itself bends when the intake device 1A is in the closed state, it is not necessary to provide a dead volume at the bottom of the intake passage as in the conventional device. Therefore, the intake device 1A does not cause a problem of a decrease in the flow rate unlike the conventional device, so that a sufficient output can be obtained from the internal combustion engine when fully opened. Further, the intake flow can be adjusted over a wide range by rotating the valve body 11. Therefore, the internal combustion engine employing the intake device 1A of the present embodiment can also obtain a sufficient output while improving the combustion efficiency.

(Modification)
The valve body 11 employed in the intake flow control valve 10 may be a simple rubber plate or a leaf spring, but the portion that is elastically deformed when abutting against the inner wall of the intake passage 3 is made constant and predetermined It is more desirable to design so that the above-mentioned bending occurs. FIG. 3 shows a modification of the valve body 11 of the intake flow control valve 10. For example, as shown in FIG. 3A, when the valve body 11 is formed of a plate-like rubber material or a leaf spring, the groove portion 17 is provided and a place where the portion is deformed by forming a thinner portion than the other portions. And the amount of deflection can be set in advance. Further, as shown in FIG. 3B, when the core material 18 is embedded at a predetermined position of the rubber material, the area where the core material 18 is embedded has high rigidity, so that a location to be deformed can be set. Moreover, the shape stability and durability of the valve body 11 can be improved by using a core material.

  Furthermore, with reference to FIG.4 and FIG.5, the intake device which concerns on Example 2 is demonstrated. 4A and 4B are diagrams illustrating the intake device 1B according to the second embodiment. FIG. 4A is an overall configuration diagram, and FIG. 4B is a diagram schematically illustrating the intake flow control valve 20 taken out. 5A shows a half-open state of the intake device 1B, and FIG. 5B shows a fully-open state of the intake device 1B. These drawings are the same as FIGS. 1 and 2 shown for the first embodiment. In order to avoid overlapping description, the same parts are denoted by the same reference numerals.

  The intake device 1B is different from the first embodiment in the structure of the valve body of the intake flow control valve 20. As shown in FIG. 4B, the valve body 21 is divided into a first valve body portion 21A and a second valve body portion 21B. The intermediate shaft 12 is fixed to the first valve body 21A side. The second valve body portion 21 </ b> B is disposed so as to be rotatable with respect to the intermediate shaft 12. Further, two coil springs 25A and 25B are engaged with the intermediate shaft 12, and both ends of these coil springs are fixed to the first valve body portion 21A and the second valve body portion 21B, respectively. That is, the valve body 21 has a structure in which coil springs 25A and 25B as elastic members are interposed between the first valve body portion 21A and the second valve body portion 21B. The arrangement position of the coil springs 25A and 25B is not particularly limited, but may be between the intermediate position of the valve body 21 and the end of the valve body (the part that contacts the inner wall 3WA of the intake passage 3).

  The coil springs 25A and 25B are set so that the first valve body portion 21A and the second valve body portion 21B are linear when no external force is received. In the case of the present embodiment, there is no particular limitation on the plate-like members that form the first valve body portion 21A and the second valve body portion 21B, as long as they are members having a predetermined or higher rigidity and durability. Good.

  When the intake device 1B is in the closed state as shown in FIG. 4A, the lower end 13 of the second valve body 21B abuts against the inner wall 3WA of the intake passage 3. At this time, the coil springs 25A and 25B are bent (deformed) and the second valve body portion 21B is inclined. On the other hand, the first valve body 21A moves with the rotation of the intermediate shaft 12 to form a small gap 5 on the upper end 14 side. Therefore, as in the case of the first embodiment, the intake flow GS with a reduced flow rate and a fast flow can be supplied downstream, so that a strong tumble flow can be formed in the cylinder.

  Further, as shown in FIG. 5, when the valve body 21 is rotated counterclockwise from the closed state shown in FIG. 4, the external force applied to the coil spring 25 is removed, so that the first valve body portion 21A and the second valve body are removed. The portion 21B is linear and forms an integral plane. And it can be set as the fully open state of (B) through the half open state of (A). Therefore, the intake air flow GS can be controlled in a wide range according to the state of the internal combustion engine also by the intake device 1B of the present embodiment. In the intake device 1B, since the coil springs 25A and 25B bend when the closed state is formed, it is not necessary to provide a dead volume at the bottom of the intake passage as in the conventional device. Therefore, unlike the conventional apparatus, there is no problem of a decrease in flow rate, so that a sufficient output can be obtained from the internal combustion engine when fully opened.

  Furthermore, with reference to FIG.6 and FIG.7, the intake device which concerns on Example 3 is demonstrated. 6A and 6B are diagrams illustrating an intake device 1C according to the third embodiment. FIG. 6A is an overall configuration diagram of the intake device 1C, and FIG. 6B is a schematic view illustrating an intake flow control valve 30 of the intake device taken out. FIG. 7A shows a half-open state of the intake device 1C, and FIG. 7B shows a fully-open state of the intake device 1C. These figures are also shown in the same manner as FIGS. 1 and 2 shown for the first embodiment.

  The third embodiment is an embodiment related to the second embodiment. In the second embodiment, the valve body is divided into the first valve body portion and the second valve body portion at the position of the intermediate shaft 12. Even in the present embodiment, the valve body 31 is the same in that it is divided into the first valve body portion 31A and the second valve body portion 31B, but the first valve body portion 31A can be formed in a closed state independently. The point that is set to is different. The second valve body 31B is rotatably disposed on a rotation shaft 32 provided at the end of the first valve body 31A. Coil springs 35 </ b> A and 35 </ b> B are fixed to both ends of the rotation shaft 32. Both ends of the coil springs 35A and 35B are fixed to the first valve body portion 31A and the second valve body portion 31B, respectively. The coil springs 35A and 35B are also set so that the first valve body portion 31A and the second valve body portion 31B are linear when receiving no external force.

  When the intake device 1 </ b> C forms a closed state as shown in FIG. 6A, the lower end 13 of the second valve body portion 31 </ b> B contacts the inner wall 3 </ b> WA of the intake passage 3. At this time, the coil springs 35 </ b> A and 25 </ b> B are bent and the second valve body portion 31 </ b> B is completely bent and is parallel to the inner wall 3 </ b> WA. On the other hand, the first valve body portion 31 </ b> A moves and rises with the rotation of the intermediate shaft 12 and forms a small gap 5 on the upper end 14 side. Therefore, also in the third embodiment, as in the case of the first embodiment, the intake flow GS having a fast flow with the reduced intake amount can be supplied downstream to form a strong tumble flow in the cylinder. And as shown in FIG. 7, it can be set as the fully open state of (B) through the half open state of (A).

  As described above, the intake air flow GS can be controlled in a wide range according to the state of the internal combustion engine also by the intake device 1C. Since the coil springs 35A and 35B bend when the intake device 1C is also in the closed state, it is not necessary to provide a dead volume at the bottom of the intake passage as in the conventional device. Therefore, unlike the conventional apparatus, there is no problem of a decrease in flow rate, so that a sufficient output can be obtained from the internal combustion engine when fully opened.

  When the intake device 1C forms the closed state shown in FIG. 6, the flow of the intake flow GS is substantially guided only by the first valve body portion 31A. Therefore, there is no portion connecting the two valve body portions in the portion where the intake flow GS flows as in the second embodiment, so that the intake flow GS can be guided more stably.

  Further, a fourth embodiment according to the present invention will be described. The first to third embodiments show an intake device that generates a tumble flow. However, in the intake device according to the present invention, the valve body is formed of a member that can be elastically deformed, and is arranged so that one end thereof abuts against the inner wall of the intake passage when the valve body is rotated to a predetermined position. It is characterized by being. A swirl flow can be easily generated simply by changing the setting of the intermediate shaft for rotating the valve body. FIG. 8 is a diagram illustrating an intake device 1D according to a fourth embodiment that generates a swirl flow, in which (A) is a closed state in which the intake flow is restricted, (B) is a half-open state, and (C) is a full-open state. Show.

  The intake device 1D rotates the position of the intermediate shaft 12 of the intake device 1A shown in the first embodiment by 90 degrees. That is, in the intake device 1A, the intermediate shaft 12 is set in the horizontal direction as shown in FIG. 1, but in the intake device 1D, the intermediate shaft 12 is set in the vertical direction as shown in FIG. Each drawing of FIG. 8 shows the intake device 1D in plan view.

  In the closed state shown in FIG. 8A, the intake device 1D can generate a strong swirl flow SW with a reduced intake amount in the cylinder CY because the valve body 11 restricts the intake flow GS. Further, if the half-open state shown in FIG. 8B is used, a moderate swirl flow can be generated, and if the fully-open state shown in FIG. 8C is used, a sufficient intake amount can be secured. Emission can be improved by forming the closed state shown in FIG. 8A when the internal combustion engine is running at an extremely low speed such as when the engine is idling. Further, when the internal combustion engine is at a low speed and a low load, the emission and fuel efficiency can be improved by forming the half-open state of FIG. 8B. Furthermore, when the internal combustion engine is at a high rotation speed and a high load, the output of the internal combustion engine can be improved by forming the fully opened state of FIG.

  As described above, the intake device 1D of the fourth embodiment is an intake device that is changed to generate a swirl flow by changing the setting position of the intermediate shaft 12 of the intake device 1A shown in the first embodiment. Since the valve body 11 itself bends when this intake device is also in the closed state, it is not necessary to provide a dead volume on the side of the intake passage, and the intake flow can be adjusted over a wide range by rotating the valve body 11. . The fourth embodiment shows a case where the intake device 1A of the first embodiment is changed, but the swirl flow is generated by changing the arrangement position of the intermediate shaft 12 in the second and third embodiments as well. It can be changed to the intake device to be made.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

It is the figure shown about the intake device which concerns on Example 1, (A) is a whole block diagram, (B) is the figure which extracted and showed typically the intake flow control valve. It is the figure shown about the other state of the intake device of Example 1, (A) is a half-open state, (B) is a figure which shows the full open state. It is the figure shown about the modification of the valve body of an intake flow control valve. It is the figure shown about the intake device which concerns on Example 2, (A) is a whole block diagram, (B) is the figure which took out the intake flow control valve, and was shown typically. It is the figure shown about the other state of the intake device of Example 2, (A) is a half-open state, (B) is a figure which shows the full open state. It is the figure shown about the intake device which concerns on Example 3, (A) is a whole block diagram, (B) is the figure which took out the intake flow control valve and showed typically. It is the figure shown about the other state of the intake device of Example 3, (A) is a half-open state, (B) is a figure which shows the full open state. It is the figure shown about the intake device which concerns on Example 3, (A) is the closed state which restrict | squeezed the intake flow, (B) is a half-open state, (C) is the figure which shows the full open state. It is the figure shown about the conventional common intake device which employ | adopts a butterfly valve. It is the figure shown about the conventional common intake device which employs a cantilever valve.

Explanation of symbols

1A to 1D Intake device 3 Intake passage 3WA Inner wall of intake passage 4 Bearing 10 Intake flow control valve 11 Valve body 12 Intermediate shaft 13 Lower end portion (one end portion) of valve body
17 Groove portion 18 Core material 21A First valve body portion 21B Second valve body portion 25A, 25B Coil spring (elastic member)
31A 1st valve body part 31B 2nd valve body part 35A, 35B Coil spring GS Intake flow

Claims (4)

An intake device for an internal combustion engine comprising an intake flow control valve that adjusts an intake flow flowing in an intake passage by pivotally supporting and rotating a side intermediate position of a plate-like valve body,
The valve body is formed of an elastically deformable member, and one end portion of the valve body is disposed so as to be able to contact the inner wall of the intake passage when the valve body is rotated to a predetermined position. Thus, one end of the valve body closes one end side of the intake passage, and the valve body deforms in a state where one end side of the intake passage is closed, thereby reducing the passage area on the other end side of the intake passage. An intake device for an internal combustion engine, characterized by adjusting. The intake device for an internal combustion engine according to claim 1, wherein the valve body is formed of rubber that is elastically deformed at a predetermined position. 2. The intake device for an internal combustion engine according to claim 1, wherein a core material is embedded at a predetermined position in the elastic member. The valve body is formed by a first valve body portion and a second valve body portion, and a spring is interposed between the first valve body portion and the second valve body portion, and the spring is intermediate between the valve bodies. 2. The intake device for an internal combustion engine according to claim 1, wherein the intake device is disposed between a position and a valve body end contacting the intake passage. 3.

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