JP2006316736A - Intake device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for an internal combustion engine capable of controlling a wide range of an intake air flow flowing in an intake pipe. <P>SOLUTION: In this intake device 1A for the internal combustion engine, a plate-shaped intake control valve 10 which is turned using its end part positioned in a side far from an intake valve as a fulcrum 15 is arranged inside the intake pipe 3. A notch 11 is provided at the tip of the intake control valve 10, and the valve tip is bent in the turning direction. In this intake device 1A, since the valve tip has the notch 11 and bent in the turning direction, the position of the notch 11 can be stabilized, when the intake control valve 10 has a rising posture inside the intake pipe 3 to form a strong tumble flow and closes the intake pipe 3. Therefore, dispersion of the tumble flow can be suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intake device that improves the combustion efficiency of an internal combustion engine by controlling an intake flow flowing in an intake pipe.

  There have been a number of proposals related to an intake device that adjusts the intake air flow by arranging a plate-like intake air control valve in an intake pipe (also referred to as an intake port) for flowing an intake air flow toward the cylinder side of the internal combustion engine. is there. For example, Patent Document 1 arranges a partition along the longitudinal direction in an intake pipe and divides the partition into an upper first passage and a lower second passage, and rotates around a support shaft upstream of the partition. A structure is disclosed in which two plate-like valve bodies are provided to open and close a part of the intake pipe. By adopting such a structure, the opening ratio of the intake pipe can be adjusted, so that the tumble flow can be strengthened and stable combustion of the internal combustion engine can be achieved. Here, the aperture ratio is the ratio of the passage cross-sectional area through which the intake air flows to the cross-sectional area of the intake pipe serving as the base.

JP 2004-124836 A

  However, as in the structure disclosed in Patent Document 1 above, when two valve bodies are arranged coaxially and the inside of the intake pipe is opened and closed, the peripheral structure becomes extremely complicated. Furthermore, since the valve body disclosed in Patent Document 1 is a simple flat plate member, a certain degree of opening ratio must be ensured even when the opening ratio in the intake pipe is reduced to form a tumble flow. . Therefore, the tumble flow may not be set to a desired strength.

  Accordingly, an object of the present invention is to provide an intake device for an internal combustion engine that can control an intake flow flowing through an intake pipe over a wide range with a relatively simple structure.

  An object of the present invention is to provide an intake device for an internal combustion engine in which a plate-like intake control valve that rotates with an end far from the intake valve as a fulcrum is arranged in the intake pipe, and the intake control valve is cut out at the valve tip. And an intake device for an internal combustion engine in which the valve tip is bent in the rotational direction.

  According to the present invention, the intake control valve has a notch at the valve tip, and the valve tip is bent in the rotational direction, so that the intake control valve rises in the intake pipe to form a strong tumble flow. The position of the notch can be stabilized when the tube is closed. Therefore, variations in tumble flow can be suppressed.

  Another object of the present invention is to provide an intake device for an internal combustion engine in which a plate-like intake control valve that rotates with an end far from the intake valve as a fulcrum is disposed in the intake pipe. An internal combustion engine having a notch in which the intake pipe has a recess for accommodating a part of the valve tip of the intake control valve when the intake control valve is in a position where the closed state is formed. It can also be achieved by an intake device.

  According to the present invention, since the intake control valve can be set longer in the intake flow direction, the flow rate of the intake flow can be improved when the intake pipe is partially closed, and the intake pipe is connected to the valve tip of the intake control valve. In order to form a strong tumble flow, the intake control valve can be set up in the intake pipe in order to form a strong tumble flow. Therefore, the intake flow can be controlled over a wide range.

  In addition, the intake control valve employs a structure in which a groove formed with a reduced thickness is provided continuously to the notch, thereby improving the intake flow rate.

  In addition, the corner portion on the proximal end side of the notch is curved, and the intake control valve rotates from an open state to a closed state through a partially closed state, whereby a strong tumble flow is obtained in each state. Thus, the flow rate of the intake air flow can be improved. Further, the side surface portion defining the notch portion is inclined, and the intake control valve rotates from the open state to the closed state through a partially closed state, forming a strong tumble flow in each state. In addition, the flow rate of the intake air flow can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the intake device of the internal combustion engine which can control the intake flow which flows through an intake pipe with a comparatively simple structure over a wide range can be provided.

  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. In order to facilitate understanding of the technical features of the intake device according to the present invention, the technical background will be described first with reference to FIGS. 1 and 2.

  FIG. 1 is a view showing an intake device 100 in which a cantilever intake control valve is arranged in an intake pipe. In the intake device 100, the intake control valve 110 rotates around a fulcrum 112 provided on the inner wall of the intake pipe 101. The intake control valve 110 is a flat member that opens and closes the inside of the intake pipe 101. The intake control valve 110 rotates with the upstream end in the direction in which the intake flow GS flows (that is, the end far from the intake valve of the internal combustion engine) as a fulcrum 112. A notch 111 is formed at the valve tip of the intake control valve 110. 1A shows a state in which the intake control valve 110 partially closes the intake pipe 103. FIG. Similarly, (B) is a closed state in which the intake control valve 110 is in the most upright position and the intake pipe 103 is closed, and (C) is an open state in which the intake control valve 110 is in the most lying position and the intake pipe 103 is opened. Show. Hereinafter, for convenience of explanation, the state illustrated in FIG. 1B is referred to as a closed state, and the state illustrated in FIG. 1C is referred to as an open state. In addition, the right side of each of the drawings (A) to (B) shows the state of the intake control valve 110 when the inside of the intake pipe 3 is viewed from the upstream side.

  When the intake control valve 110 of the intake device 100 is rotated to shift from the open state in FIG. 1C to the closed state in FIG. 1B, a strong tumble flow can be gradually formed by the notch 111. In the closed state shown in FIG. 1B, the aperture ratio is most reduced and the intake flow GS flows only through the notch 111, so that the strongest tumble flow can be formed in the intake pipe 101. Thus, the intake device 100 can adjust the intake flow GS flowing through the intake pipe 101 in a wide range with a simple structure, and can provide a strong tumble flow by providing the notch 111 at the valve tip.

  By the way, as shown in FIG. 1 (A), when a state in which a part of the intake pipe 101 is closed is formed, it is desirable that the intake apparatus be capable of efficiently sending the intake flow GS downstream while suppressing pressure loss. In this regard, there is still room for improvement in the intake device 100 of FIG. This point will be described with reference to FIG.

  FIG. 2 schematically shows the intake device 100 in a case where an intake control valve 110-1 having a longer dimension in the intake flow direction and an intake control valve 110-2 having a shorter dimension are arranged. It is a figure. FIG. 2A shows a state in which the intake control valve is rotated in the intake pipe 101 and closed from the upper side to a length d. The partially closed state shown in FIG. 2A is set when it is necessary to feed a certain amount of intake air flow into the internal combustion engine while increasing the tumble flow of the intake air flow. Therefore, a structure that can smoothly flow to the downstream side without causing pressure loss in the intake air flow is required. From this point of view, rather than adopting the short intake control valve 110-2, the pressure loss can be suppressed by arranging the intake control valve 110-1 in the laying posture (tilted posture) using the long intake control valve 110-1.

  However, as shown in FIG. 2B, in the closed state in which the opening ratio in the intake pipe 101 is most narrowed and a strong tumble flow is formed only through the notch 111 to form a strong tumble flow, the preferred intake control valve is as described above. Vice versa. When the short intake control valve 110-2 is employed, the posture is more upright. Therefore, even if the intake control valve 110-2 is rotated a little around the fulcrum 112, the height position of the notch 111 (position in the h direction orthogonal to the intake flow in FIG. 2B) is small, so the tumble The change to the flow can be suppressed. That is, when the short intake control valve 110-2 is employed, a strong tumble flow can be stably supplied.

  On the other hand, when the long intake control valve 110-1 is adopted and the closed state is formed, the posture becomes a sleeping position. Therefore, even if the intake control valve 110-1 is slightly rotated around the fulcrum 112, the notch 111 The height position changes greatly. Therefore, the variation of the tumble flow becomes large. Therefore, when the long intake control valve 110-1 is adopted, it is necessary to assemble with high precision using high precision parts, and it is also necessary to perform drive control with high precision. It becomes a simple intake device.

  As described above, the long intake control valve 110-1 is preferable in a state in which the intake pipe 101 is partially closed in that the pressure loss can be suppressed and the intake flow can be smoothly guided, but in the closed state in which a strong tumble flow is formed. Tumble flow tends to vary. On the contrary, the short intake control valve 110-2 has a large pressure loss in a partially closed state, but is excellent in that the tumble can be stably maintained in a closed state in which a strong tumble flow is formed. As described above, the intake device including the cantilever intake control valve shown in FIG. 1 has to be improved in order to adjust the intake flow over a wide range. The intake device of the present invention improves this point. Embodiments will be described below with reference to the drawings.

  FIG. 3 is a diagram illustrating the intake device 1A according to the first embodiment. FIG. 3A shows a case where the inside of the intake pipe is partially closed, and FIG. 3B shows a case where the intake pipe is closed to form a strong tumble flow. 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. 3, 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 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 pipe 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 pipe is provided.

  An injector mounting portion 7 is formed on the upper portion of the intake pipe 3 so as to protrude outward, and fuel is injected into the intake pipe 3 from a tip end portion 8 a of the injector 8 inserted into the mounting portion 7. Therefore, the intake air flow GS thereafter becomes an air-fuel mixture containing fuel.

  The intake control valve 10 is generally plate-shaped, and a support shaft 15 serving as a fulcrum is formed at the end. The support shaft 15 is formed at an end portion far from the intake valve. Therefore, the intake control valve 10 is disposed from the support shaft 15 toward the downstream side. The support shaft 15 is supported by a bearing 16 provided on the inner wall of the intake pipe 3, and the intake control valve 10 is rotatable. The basic structure of the intake device 1A is the same as that of the intake device 100 including the cantilevered intake control valve 110 described above, and a notch 11 is formed at the valve tip of the intake control valve 10. However, the intake control valve 10 included in the intake device 1 </ b> A has a different structure from the intake control valve 110 of the intake device 100. This will be described in detail after the overall configuration of the intake device 1A is described.

  A rotational force from the actuator 17 is transmitted to the support shaft 15. The drive of the actuator 17 is controlled by an ECU (Electronic Control Unit) 18. The ECU 18 may also be used as an ECU that controls an internal combustion engine (not shown). In this case, the actuator 17 can be controlled in accordance with the state of the internal combustion engine to move the intake control valve 10 to a desired position from opening to closing. Therefore, in the intake device 1A, a state where the inside of the intake pipe 3 is partially restricted as shown in FIG. 3A can be formed by the control of the ECU 18, and a strong tumble is formed as shown in FIG. 3B. Therefore, it is possible to form a closed state in which the aperture ratio is minimized. Although not shown in FIG. 3, similarly to the intake device 100 shown in FIG. 1, the intake device 1 </ b> A can also open the intake pipe 3 with the intake control valve 10 in the laid posture.

  Next, the intake control valve 10 will be described with reference to FIG. FIG. 4 is an enlarged view of the intake control valve 10 shown in FIG. 4A is a perspective view of the intake control valve 10, and FIG. 4B is a front view and a side view of the intake control valve 10. FIG. The intake control valve 10 is a substantially rectangular plate-like member. The dimension in the intake flow direction is set to be longer. Therefore, as shown in FIG. 3 (A), when the state in which the inside of the intake pipe is partially closed is formed, it is designed to be in a sleeping state.

  Further, the valve tip 10EG of the intake control valve 10 is formed to be bent with respect to the main body portion 10MF. The above-described support shaft 15 is formed at the end opposite to the valve tip 10EG so as to protrude to both sides. The valve tip 10EG is bent in the direction in which the intake control valve 10 rotates, more specifically in the direction in which the intake flow GS is splashed.

  A notch 11 is formed in the valve tip 10EG. Moreover, the groove part 12 formed by reducing thickness is formed in the center part of the valve main-body part 10MF. Therefore, the portion where the groove portion 12 is formed is thinner than the valve body portion 10MF, so that the peripheral portion forms a step 12a. Here, the illustrated groove portion 12 is formed in a V shape. The bottom of the groove 12 is formed flat. The groove 12 is formed so that the valve tip side is continuous with the notch 11. When the groove portion 12 is provided in this way, a turbulent flow (small vortex) is generated when the intake air flows in contact with this portion. This turbulent flow acts to reduce the frictional resistance with the surface of the intake control valve 10 and suck the peripheral intake flow toward the groove 12. Therefore, the flow rate of the intake air around the groove 12 can be improved. The intake air flow thus induced in the groove 12 flows to the opposite side (downstream side) through the notch 11. Therefore, the intake control valve 10 provided with the groove portion 12 becomes a structure that improves the intake flow flowing through the notch 11.

  Further, as shown in FIG. 4B, the corner R on the base end side of the notch 11 is formed to be curved. And the notch 11 is formed so that it may expand toward the outer side. In FIG. 4B, the notch 11 is exemplarily formed so as to expand outward with a central angle α. The side surface portion TA that defines the notch 11 is an inclined surface. Thus, the notch 11 formed in the intake control valve 10 has an inverted trapezoidal plan shape and a large curvature at the corner R. By making the corners have a large curvature, the flow of the intake air flow becomes smooth. Therefore, the notch 11 can secure a substantially large passage area as compared with a quadrangle having the same height HT and the same cross-sectional area. That is, the notch 11 has a shape capable of improving the flow rate of the intake air flow as compared with the case of a notch (see notch 111 in FIG. 1) having a square area with a square corner and the same area.

  According to the intake device 1A, as shown in FIG. 3 (A), the intake control valve 10 can be in a sleeping position when a state in which a part of the intake pipe 3 is closed is formed. A sufficient intake air flow can be suppressed and supplied to the internal combustion engine. Further, since the intake control valve 10 includes the inverted trapezoidal cutout 11, the base end side corner portion R of the cutout 11 has a larger curvature, thereby improving the flow rate of the intake flow. Furthermore, the intake control valve 10 is also provided with a groove 12 continuous to the notch 11 to improve the flow rate of the intake flow.

  Further, as shown in FIG. 3B, when the intake control valve 10 forms the closed state of the intake pipe 3, the state in which the intake flow GS passes only through the notch 11 can be stably maintained. Therefore, according to the intake device 1A of the first embodiment, a desired strong tumble flow can be formed.

  Incidentally, as pointed out above with reference to FIG. 2B, the intake control valve in which the dimension in the intake flow direction is set to be long tends to vary the tumble flow. The intake device 1A has a structure that also copes with this point. This will be described with reference to FIG. FIG. 5A is a view showing a state when a simple flat plate-like intake control valve 110 is rotated, and FIG. 5B is an intake control valve in which the valve tip 10EG of the embodiment is bent in the rotation direction. It is the figure which showed the mode when 10 was rotated.

  As can be confirmed from FIG. 5A, even if the intake control valve 110 is slightly rotated, the height change (d1) of the notch 111 and the direction change of the notch 111 are large. For this reason, it can be understood that the above-described variation in the tumble flow occurs. On the other hand, in the intake control valve 10 shown in FIG. 5B, it can be seen that the position change (d2) of the notch 11 is small and the change in the direction of the notch 11 is also small. Therefore, when the intake control valve 10 is employed, a strong tumble flow can be stably maintained even if there is a small part error or assembly error. Further, it is not necessary to perform opening / closing control of the intake control valve 10 with high accuracy. Therefore, the intake device 1A provided with the intake control valve 10 can reduce the cost. In this way, the tumble flow can be stabilized by bending the valve tip of the intake control valve 10 in the rotational direction. Further, as compared with the case where the intake control valve having the same length is adopted, it is possible to suppress the angle variation when the intake control valve 10 is rotated to reach the closed state where the intake pipe is closed.

  Further, the simple flat intake control valve 110 is easily affected by the shape of the notch 111. When the machining accuracy of the notch 111 is poor, as shown in FIG. 6A, the passed intake GS may sag downward and further weaken the tumble. However, as shown in FIG. 6 (B), the valve tip 10EG of the intake control valve 10 is bent in the direction of splashing the intake flow GS, so even if there is a slight processing error in the notch 11, the intake flow GS The direction can be maintained upward. Also in this respect, the intake device 1A including the intake control valve 10 can stably maintain the tumble flow. Thus, the tumble flow can be stabilized regardless of the rotational state of the intake control valve 10 with a simple structure in which the valve tip is provided with a notch and the valve tip is bent in the rotational direction.

  FIG. 7 is a diagram summarizing the effects obtained by the intake device 1A of the first embodiment described above. FIG. 7A shows the relationship between the tumble ratio and the flow rate when the intake pipe is partially closed. The “tumble ratio” is an index value indicating the in-cylinder airflow strength, and is defined as the ratio of the rotational speed of the tumble flow to the rotational speed of the internal combustion engine. Here, the dotted line indicates an intake device that employs the short intake control valve 110-2 in FIG. On the other hand, in the intake device 1A of the first embodiment, the flow rate of the intake flow is greatly improved as shown by the solid line. The effect of providing the inverted trapezoidal notch 11 at the valve tip of the intake control valve 10 and providing the V-shaped groove 12 can be confirmed.

  In addition, although the intake control valve 10 of Example 1 has shown about the structure provided with the inverted trapezoidal notch 11 and the groove part 12 exemplarily, this invention is not limited to this. Even when one of the inverted trapezoidal notch 11 and the groove 12 is applied to the intake control valve 10, the flow rate of the intake flow can be improved. Moreover, although the shape of the groove part 12 has preferable V shape, it is not restricted to this. Other shapes such as a U shape or a U shape may be used.

  FIG. 7B is a view similarly showing the relationship between the tumble ratio and the flow rate when the intake pipe is closed to form a strong tumble flow. However, the dotted line here has shown about the intake device which employ | adopted the long intake control valve 110-1 in FIG.2 (B). On the other hand, in the intake device 1A of the first embodiment, variation in the tumble ratio is suppressed as shown by the solid line. The effect of bending the valve tip 10EG of the intake control valve 10 and providing the notch 11 in this portion can be confirmed. Moreover, the improvement of the flow rate of the intake flow can also be confirmed. This is an effect obtained by providing the notch 11 and the groove 12. Thus, if the notch 11 and the groove part 12 are provided in the intake control valve, the flow rate can be improved even in the closed state where a strong tumble flow is formed.

  As is clear from the above description, the intake device 1A provided with the intake control valve 10 can increase the flow rate when the interior of the intake pipe 3 is partially closed, and can cause the intake flow to flow. It can suppress and maintain a strong tumble flow stably. Therefore, it can be provided as an intake device for an internal combustion engine that can control the intake flow over a wide range.

  FIG. 8 is a diagram illustrating the intake device 1B according to the second embodiment. FIG. 8A shows a state in which the intake pipe is partially closed. The same (B) shows a case where the intake pipe is closed to form a strong tumble flow. The intake control valve provided in the intake device 1B is a flat intake control valve 20, and a slit hole 21 is formed as a notch on the valve tip side. In addition, the description which overlaps by omitting the same code | symbol to the site | part similar to 1 A of intake devices of Example 1 is attached. FIG. 9 is an enlarged front view and side view of the intake control valve 20 shown in FIG.

  This intake control valve 20 is also a substantially rectangular plate-like member. The dimension in the intake flow direction is set longer. Therefore, as shown in FIG. 8 (A), when forming a state in which the inside of the intake pipe is partially closed, the intake control valve 20 is in a sleeping position.

  Further, the valve tip side of the intake control valve 20 is not bent as in the first embodiment. A rectangular slit hole 21 is formed in the valve tip. When a strong tumble flow is formed, it is necessary to rotate the intake control valve 20 in a direction in which the intake control valve 20 stands in the intake pipe 3. In this case, the same state as that of the long intake control valve 110-1 previously pointed out in FIG. However, the intake pipe 3 of the second embodiment is provided with a recess 31 that accommodates a portion that interferes when the intake control valve 20 comes to the position where the closed state is formed (that is, an extra long portion). The portion PR on the tip side from the slit hole 21 shown in FIG. 9 is housed in the recess 31 of the intake pipe 3 as shown in FIG. Therefore, the intake control valve 20 can be in a standing posture close to a right angle with respect to the inner wall of the intake pipe 3.

  FIG. 10 is a diagram summarizing the effects obtained by the intake device 1B of the second embodiment described above. FIG. 10A is a diagram showing the relationship between the tumble ratio and the flow rate when the intake pipe is partially closed. The dotted line in FIG. 10A shows an intake device that employs a short intake control valve 110-2. On the other hand, in the intake device 1B of the second embodiment, the flow rate of the intake flow is greatly improved as shown by the solid line. This is because the intake control valve 20 can be placed in a lying state (inclined posture) in the flow direction of the intake flow. FIG. 10B similarly shows the relationship between the tumble ratio and the flow rate when a strong tumble flow is formed with the intake pipe closed. A dotted line indicates an intake device that employs the long intake control valve 110-1 in FIG. On the other hand, in the intake device 1B of the second embodiment, the variation in the tumble ratio is suppressed as indicated by the solid line. Further, the portion PR beyond the slit hole of the intake control valve 20 is accommodated in the recessed portion 31 of the intake pipe 3 so as to be in a standing posture, and the effect of suppressing the position change of the notch 21 can be confirmed. .

  As is clear from the above description, the intake devices 1A and 1B of the first embodiment can set the intake control valve disposed in the intake pipe 3 to have a longer dimension in the flow direction of the intake flow, so It is possible to improve the flow rate of the intake flow when partly closed. Further, since the intake control valve is in a standing posture when a strong tumble flow is obtained, variations in tumble can be suppressed. Therefore, it can be provided as an intake device for an internal combustion engine that can control the intake flow over a wide range. If such intake devices 1A and 1B are employed, fuel and air can be sufficiently mixed, and combustion of the internal combustion engine can be improved. Therefore, the torque and output of the internal combustion engine can be improved by improving the combustion.

  In the second embodiment, the case where the slit hole 21 is formed as a notch in the intake control valve 20 is illustrated. However, it may be a U-shaped notch in which one of the holes is not opened. As for the notch of the intake control valve 20, similarly to the intake control valve 10 of the first embodiment, by adopting a structure in which the curvature of both corners on the base side is formed large or a structure in which a groove 12 is added, the intake flow is reduced. The flow rate can be further improved.

  Further, in the first and second embodiments, the intake flow GS flowing inside the intake pipe 3 is adjusted by the intake control valves 10 and 20, but the partition plate extends along the intake flow direction inside the intake pipe 3. You may employ | adopt the structure which has arrange | positioned (partition wall). Thus, when a partition plate is arrange | positioned in the intake pipe 3, a stronger tumble flow can be formed.

  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 has arrange | positioned the cantilevered intake control valve in the intake pipe. FIG. 2 is a view schematically showing a comparison between a case where an intake control valve having a longer dimension in the intake flow direction and an intake control valve having a shorter dimension are arranged in the intake device of FIG. 1. It is the figure shown about the intake device which concerns on Example 1. FIG. It is the figure which expanded and showed the intake control valve shown in FIG. It is the figure which showed the mode when the intake control valve from which a shape differs was rotated. It is the figure shown about the influence of the notch of the intake control valve from which a shape differs. It is the figure which put together the effect acquired by 1 A of intake devices of Example 1. FIG. It is the figure shown about the intake device which concerns on Example 2. FIG. It is the front view and side view which expanded and showed the intake control valve shown in FIG. It is the figure on which the effect acquired by the air intake device of Example 2 was put together.

Explanation of symbols

1A, 1B Intake device 3 Intake 10, 20 Intake control valve 10EG Valve tip 11, 21 Notch 12 Groove portion 15 Support shaft (fulcrum)
31 Indentation part GS Intake flow

Claims (5)

An intake device for an internal combustion engine in which a plate-like intake control valve that rotates around an end far from the intake valve as a fulcrum is disposed in the intake pipe,
An intake device for an internal combustion engine, wherein the intake control valve has a notch at a valve tip, and the valve tip is bent in a rotating direction. An intake device for an internal combustion engine in which a plate-like intake control valve that rotates around an end far from the intake valve as a fulcrum is disposed in the intake pipe,
The intake control valve has a notch at the valve tip;
The internal combustion engine according to claim 1, wherein the intake pipe has a recess for storing a part of the valve tip of the intake control valve when the intake control valve is in a position where the closed state is formed. Intake device. The intake device for an internal combustion engine according to claim 1 or 2, wherein the intake control valve is provided with a groove portion formed in a reduced thickness so as to be continuous with the cutout portion. The internal combustion engine according to claim 3, wherein a corner portion on the base end side of the notch is curved, and the intake control valve rotates from an open state to a closed state through a partially closed state. Engine intake system. 4. The internal combustion engine according to claim 3, wherein a side surface portion defining the notch portion is inclined, and the intake control valve rotates from an open state to a closed state through a partially closed state. Intake device.

Images