JP2006283697A - Intake device of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for improving combustion efficiency and emission, by restraining fuel sticking to an under surface of a partition plate. <P>SOLUTION: This intake device 1A of an internal combustion engine has an intake control valve 20 for opening and closing a second intake passage, by dividing the inside into a first intake passage and the second intake passage, by arranging the partition plate 4 in the longitudinal direction in an intake pipe 3; and has a communicating part 25 for making a part of intake air GS turning to a combustion chamber flow along the partition plate on the second intake passage side, when the intake control valve 20 closes the second intake passage 6. The intake device 1A prevents sticking of the fuel FU to the partition plate 4 by a part SGS of an intake air flow flowing via the communicating part, and can improve combustion efficiency and emission of the internal combustion engine since the sticking fuel can be scraped away. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intake device for an internal combustion engine in which a partition plate is disposed in an intake pipe to control intake flow.

  Conventionally, a plurality of intake devices having a structure that generates a strong tumble flow in an intake pipe (also referred to as an intake port) have been proposed. For example, in Patent Document 1, a partition plate (also referred to as a partition wall, a partition wall, or the like) along the longitudinal direction is arranged inside the intake pipe, and is divided into a tumble passage and a control passage. An intake flow control valve that can be freely opened and closed is disposed on the control passage side, and left and right partition walls are provided on the tumble passage side to stratify the tumble flow.

Japanese Patent Application Laid-Open No. 6-1559079

  In the intake device disclosed in Patent Document 1, fuel is injected to the tumble passage side, and the intake air flow after passing through the partition plate flows into the combustion chamber including the fuel. FIG. 11A schematically shows the state of the intake device 100 at this time. In the intake device 100, the inside of the intake pipe 103 is divided into a tumble passage 105 and a control passage 106 by a partition plate 104. FIG. 11A shows a state where the intake flow control valve 110 is rotated to close the control passage 106 side and a strong tumble flow is generated in the tumble passage 105. When such a state is formed, a part of the intake air flow after passing through the partition plate 104 may become a strong vortex EC at the lower end. This vortex EC flows backward through the control passage 106 and causes the fuel FU to adhere to the lower surface of the partition plate 104 in the form of droplets. Further, the fuel FU may adhere to the lower surface of the partition plate 104 due to blow-back when an intake valve (not shown) at the upper part of the cylinder is opened.

  The fuel FU that has flowed back or blown back is retained in the lower surface of the partition plate 104 or a recessed portion in the periphery. When the intake flow control valve 110 is switched to open (particularly fully open) in a state where the injected fuel stays on the control passage 106 side in this way, as shown in FIG. The air / fuel ratio (A / F) suddenly becomes rich because it flows in at once. Since this change is sudden, it is extremely difficult to control the air-fuel ratio. For this reason, the combustion efficiency of the internal combustion engine is lowered and the emission is deteriorated.

  Therefore, an object of the present invention is to provide an intake device that can suppress the fuel adhering to the lower surface of the partition plate and improve combustion efficiency and emission.

  An object of the present invention is to provide an internal combustion engine having an intake control valve that opens and closes the second intake passage while providing a partition plate along the longitudinal direction in the intake pipe to divide the interior into a first intake passage and a second intake passage. In the engine intake device, a communication portion is provided that causes a part of the intake air directed to the combustion chamber to flow along the partition plate on the second intake passage side when the intake control valve closes the second intake passage. This is achieved by an intake device of an internal combustion engine.

  According to the present invention, fuel can be prevented from adhering to the partition plate by a part of the intake air flow flowing through the communicating portion, and the adhering fuel can be scraped off, so that the fuel stays on the second intake passage side. Can be suppressed. Therefore, it is possible to improve the combustion efficiency and the emission of the internal combustion engine.

  The intake control valve may include the communication portion, and the communication portion may adopt a structure that rectifies the intake air so that a part of the intake air flows along the partition plate on the second intake passage side.

  In addition, the intake control valve is pivotally supported, and a first blade that rotates in the intake pipe, and a first blade that is spaced from the first blade and rotates integrally with the first blade. It is good also as a structure including 2 blade | wing blades and the said communication part being formed with the said 1st blade blade and the said 2nd blade blade.

  In addition, the intake control valve includes a vane plate that is pivotally supported and rotates in the intake pipe, and the communication portion extends through the through hole provided in the vane plate and the downstream facing the through hole. It is good also as a structure currently formed with the louver board arrange | positioned in the said blade board.

  Further, the object is to provide a partition plate along the longitudinal direction in the intake pipe to divide the interior into a first intake passage and a second intake passage, to open and close the second intake passage, and to the first intake passage. An intake device for an internal combustion engine having an intake control valve that can reduce the intake air, wherein when the second intake passage closes the second intake passage, a part of the intake air that is directed to the combustion chamber is supplied to the second intake air A first communication portion that flows along the partition plate on the passage side; and a part of the intake air that is directed to the combustion chamber when the intake control valve reduces the first intake passage; It is also achieved by an intake device for an internal combustion engine that includes a second communication portion that flows along the plate.

  According to the present invention, not only when the second intake passage is closed, but also when the first intake passage is reduced and the tumble flow is strengthened, the adhesion of fuel to the partition plate is prevented, and the attached fuel Therefore, it is possible to suppress the fuel from staying on the second intake passage side.

  In addition, the intake control valve includes the first communication portion and the second communication portion, and the first communication portion and the second communication portion are such that a part of the intake air is along the partition plate on the second intake passage side. Alternatively, a rectifying structure may be employed so as to flow.

  In addition, the intake control valve is pivotally supported, and a first blade that rotates in the intake pipe, and a first blade that is spaced from the first blade and rotates integrally with the first blade. 2, and a third wing plate that is disposed at a distance from the second wing plate and rotates integrally with the first wing plate, wherein the first communicating portion is the second wing plate. And the third vane plate, and the second communication portion may be formed by the first vane plate and the second vane plate.

  If the passage is formed so as to be gradually narrower toward the downstream side of the intake air, the communication portion can increase the flow rate of the intake air and more reliably suppress the fuel adhesion to the partition plate.

  An internal combustion engine having an intake control valve for opening and closing the second intake passage while providing a partition plate along the longitudinal direction in the intake pipe to divide the interior into a first intake passage and a second intake passage. In the intake device, the above-mentioned object is also achieved by an intake device for an internal combustion engine, wherein the partition plate includes a through hole and a louver plate disposed on the partition plate so as to face the through hole and extend downstream. it can.

  ADVANTAGE OF THE INVENTION According to this invention, the fuel which adheres to the lower surface of a partition plate can be suppressed, and the intake device which can aim at the improvement of combustion efficiency and the improvement of emission 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.

  FIG. 1 is a diagram illustrating an intake device 1A according to the first embodiment. FIG. 1A is a diagram showing the overall configuration of the intake device 1A, and FIG. 1B is a perspective view showing the intake control valve 20 included in the intake device 1A. 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. 1A, 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.

  Inside the intake pipe 3, a partition plate 4 is arranged along the longitudinal direction. The partition plate 4 divides the inside of the intake pipe 3 into a first intake passage 5 and a second intake passage 6. An injector mounting portion 7 is formed on the upper portion of the first intake passage 5 so as to protrude outward, and fuel FU is injected into the intake pipe 3 from the tip 8 a of the injector 8 inserted into the mounting portion 7. The Therefore, the intake air flow GS thereafter becomes an air-fuel mixture containing fuel.

  An intake control valve 20 is disposed upstream of the partition plate 4 (intake manifold side). The intake control valve 20 includes two blades, that is, a first blade 21 and a second blade 22. FIG. 1B shows a perspective view of the intake control valve 20 as viewed from the intake manifold side. As shown in this figure, the blade plates 21 and 22 are connected via side plates 23 and 24 at both ends. The blades 21 and 22 are arranged substantially in parallel with a predetermined interval. Therefore, a communication path 25 is formed between the first blade plate 21 and the second blade plate 22. The communication passage 25 rectifies a part of the intake flow GS and flows along the lower surface of the partition plate 4 (the surface on the second intake passage 6 side) when the intake control valve 20 is in a half-open state to be described later. It is formed as follows.

  The first vane plate 21 has a support shaft 15 at one end, and is supported by a bearing 16 provided on the inner wall of the intake pipe 3. Therefore, the first blade 21 can be rotated around the bearing 16. In the illustrated example, a bearing 16 is disposed on the wall surface on the second intake passage 6 side. Further, the 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 first vane plate 21 can be rotated to a desired position by controlling the actuator 17 in accordance with the state of the internal combustion engine.

  Since the second blade 22 is fixed to the first blade 21 via the side plates 23 and 24, the second blade 22 moves integrally when the first blade 21 is driven. As shown in FIG. 1A, when the second vane plate 22 forms a state in which the second intake passage 6 is closed and only the first intake passage 5 is opened, the first intake passage is more than in the fully opened state. A strong tumble flow can be formed in 5. The state in which the second intake passage 6 shown in FIG. 1A is closed is referred to as a half-open state, and the intake control valve 20 rotates to be parallel to the wall surface of the intake pipe 3 and the first intake passage 5 and A state where the second intake passage 6 is opened is referred to as a fully opened state. In the intake device 1A, the first intake passage 5 is a tumble passage, and the second intake passage 6 is a control passage. In addition, you may comprise so that the intake control valve 20 can be rotated from the half-open state to the direction which further closes the 1st intake passage 5 (throttle intake flow GS).

  FIG. 1A schematically shows the behavior of the fuel FU caused by the backflowed intake air flow CGS. Although the fuel FU adheres to the lower surface of the partition plate 4, a part of the intake air flow GS that passes through the communication passage 25 in the half-open state (referred to as a partial intake air flow SGS) flows along the lower surface of the partition plate 4. It acts to scrape off the adhering fuel FU. Therefore, the fuel FU adhering to the lower surface of the partition plate 4 can be suppressed.

  When the first blade plate 21 and the second blade plate 22 form a half-open state, the flow of the partial intake air flow SGS is rectified and the fuel FU adhering to the lower surface of the partition plate 4 is efficiently scraped off. The inclination angle of both blade plates 21 and 22 and the interval between the first blade plate 21 and the second blade plate 22 are set. In addition, the effect of scraping off the fuel FU is the highest in the half-open state shown in FIG. 1A, but the partial intake air flow SGS blows off the fuel FU even during the transition from the full-open state to the half-open state. Can prevent fuel adhesion.

  As is clear from the above description, according to the intake device 1A of the first embodiment, the fuel FU adhering to the lower surface of the partition plate 4 can be scraped off by the partial intake flow SGS flowing through the communication passage 25. It is possible to suppress the fuel from staying on the second intake passage 6 side. Note that the intake control valve 20 of the intake device 1A may be manufactured by connecting the first blade plate 21 and the second blade plate 22 that are prepared separately by the side plates 23 and 24, but a mold or the like may be used. If used and integrally molded, cost reduction can be achieved. When this intake device 1A is used, it is possible to prevent a situation in which the fuel staying on the control passage side suddenly flows, so that the combustion efficiency of the internal combustion engine and the emission can be improved. Further, since the intake device 1A stabilizes the A / F, it is possible to obtain a stable output by suppressing the torque fluctuation of the internal combustion engine.

  FIG. 2 is a diagram illustrating the intake device 1B according to the second embodiment. The same parts as those of the intake device 1A of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The same applies to the following embodiments. FIG. 2A is a diagram showing the overall configuration of the intake device 1B, and FIG. 2B is a perspective view showing the intake control valve 30 included in the intake device 1B.

  The intake control valve 30 provided in the intake device 1B is different in structure from the intake control valve 20 of the intake device 1A. The intake control valve 30 has three blades, that is, a first blade 31, a second blade 32 and a third blade 33. The vanes 31 and 32 are connected via side plates 34 and 35 at both ends, and the vanes 32 and 33 are connected via side plates 36 and 37 at both ends. Each of the blades 31, 32, and 33 is disposed substantially parallel to each other with a predetermined interval. A first communication path 38 is formed between the second blade plate 32 and the third blade plate 33. Similarly, a second communication path 39 is formed between the first blade plate 31 and the second blade plate 32.

  The first communication passage 38 functions as a first communication portion, and is formed to allow a partial intake flow SGS-1 to flow along the partition plate 4 on the second intake passage 6 side in a half-open state. . Further, the second communication passage 39 functions as a second communication portion, and when the intake control valve contracts the first intake passage 5, a part of the intake air flow SGS-2 is divided on the second intake passage 6 side. 4 is formed to flow along.

  FIG. 2A shows a state where the intake device 1B is in a half-open state. The fuel FU adhering to the lower surface of the partition plate 4 is scraped off by the partial intake flow SGS-1 that has passed through the first communication passage 38. Further, the fuel FU is prevented from adhering to the lower surface of the partition plate 4 even before and after forming the half-open state. Furthermore, the partial intake air flow SGS-2 that has passed through the second communication passage 39 conveys the scraped fuel FU toward the combustion chamber. Therefore, the intake device 1B can suppress the fuel FU adhering to the lower surface of the partition plate 4 in the same manner as the intake device 1A of the first embodiment, so that the combustion efficiency of the internal combustion engine and the emission can be improved. Further, since the A / F is stabilized by the intake device 1B, a stable output can be obtained by suppressing the torque fluctuation of the internal combustion engine. In particular, the intake device 1B has a structure in which the second communication passage 39 is further disposed below the first communication passage 38, so that fuel can be prevented from staying on the second intake passage 6 side.

  Further, the intake device 1B is different from the intake device 1A according to the first embodiment in that the first intake passage (tumble passage) 5 is reduced so that the tumble flow can be strengthened. The intake device 1B is formed so as to suppress fuel adhering to the partition plate 4 even when the first intake passage 5 is reduced. In addition, the state which narrowed down the 1st intake passage 5 side used as a tumble passage is called a small open state. The intake control valve 30 may be configured to be able to further rotate in the direction of closing the first intake passage 5 (throttle the intake flow GS) from this small open state.

  The intake device 1A according to the first embodiment described above is set to rotate between, for example, a position where the intake control valve 20 forms a fully open state and a position where a half open state is formed. In the intake device 1B according to the second embodiment, for example, the intake control valve 30 is set to rotate from a position where the fully open state is formed to a position where the small open state is formed via a position where the half open state is formed. . The operation control of the intake control valve 30 is performed by the ECU 18 that controls the actuator 17. FIG. 3 is a diagram schematically showing how the intake control valve 30 of the intake device 1B rotates. FIG. 3A shows a fully open state, FIG. 3B shows a half-open state, and FIG. 3C shows a small-open state. Yes. FIG. 3 shows the intake control valve 30 in a simplified plate shape, and the right side of each figure shows the state of the intake control valve 30 in which the inside of the intake pipe 3 is throttled.

  FIG. 4 is a view showing the small opening state of the intake device 1B. When the intake device 1B is in the small open state, the partial intake flow SGS-2 that has passed through the second communication passage 39 formed between the first blade plate 31 and the second blade plate 32 is partitioned. The fuel FU is prevented from adhering to the lower surface of the plate 4 and acts to scrape off the adhering fuel FU. Therefore, it is possible to suppress the fuel from staying on the second intake passage 6 side even in the small open state. As shown in FIG. 4, in the small open state, the partial intake flow SGS-1 that has passed through the first communication passage 38 flows through the first intake passage 5 side.

  As is clear from the above description, according to the intake device 1B of the second embodiment, the fuel FU adhering to the lower surface of the partition plate 4 is not only in the half-open state but also in the small open state that strengthens the tumble flow. Can be scraped off. Therefore, according to the intake device 1 </ b> B, a stronger tumble flow can be formed, and fuel adhering to the lower surface of the partition plate 4 can also be suppressed at this time. The intake control valve 30 of the intake device 1B may also be manufactured by connecting the first blade plate 31, the second blade plate 32, and the third blade plate 33, which are prepared separately, with side plates 34 to 37. However, cost reduction can be achieved by integrally molding using a mold or the like.

  FIG. 5 is a diagram illustrating the intake device 1 </ b> C according to the third embodiment. FIG. 5A is a view showing the overall configuration of the intake device 1C, and FIG. 5B is a perspective view showing the intake control valve 40 included in the intake device 1C.

  The intake control valve 40 of the intake device 1C includes two blades, that is, a first blade 41 and a second blade 42. The blades 41 and 42 are connected via side plates 43 and 44 at both ends. Yes. The basic structure of the intake control valve 40 is the same as that of the intake control valve 20 of the first embodiment. However, the side plates 43 and 44 are formed between the blade plates 41 and 42 as shown in FIG. The difference is that the passage 45 has a structure in which the passage 45 is gradually narrowed toward the downstream (the passage is narrowed). Although FIG. 5B shows a structural example in which the distance between the side plates 43 and 44 is gradually reduced, this is not restrictive. It is good also as a structure which makes the 1st blade 41 gradually approach the 2nd blade 42 42 toward the downstream, and narrows the communicating path 45 gradually. The intake control valve 40 can also be obtained by integral molding using a mold or the like.

  The intake device 1 </ b> C can prevent the fuel FU from adhering to the lower surface of the partition plate 4 by the partial intake flow SGS in the half-open state, and scrapes the adhering fuel FU. However, since the inside of the communication path 45 is formed so as to be gradually narrowed, the partial intake flow SGS that has passed through the communication path 45 has a higher flow velocity than the partial intake flow SGS of the above-described embodiment. Therefore, the fuel FU adhering to the lower surface of the partition plate 4 can be scraped off strongly. Similarly to the intake device 1A of the first embodiment, the intake device 1C can suppress the fuel adhering to the lower surface of the partition plate 4, and can improve the combustion efficiency and the emission of the internal combustion engine. Further, torque fluctuations of the internal combustion engine can be suppressed.

  FIG. 6 is a view illustrating an intake device 1D according to the fourth embodiment. FIG. 6A is a diagram showing the overall configuration of the intake device 1D, and FIG. 6B is a perspective view showing the intake control valve 50 included in the intake device 1D. The intake device 1D includes an intake device 1B that suppresses the attachment of the fuel FU to the lower surface of the partition plate 4 in the half-open state and the small-open state shown in the second embodiment (see FIGS. 2 to 4), and the third embodiment ( The intake passage 1 </ b> C is combined with the intake passage 1 </ b> C that restricts the attachment of the fuel FU by reducing the communication path shown in FIG. 5 and increasing the flow velocity.

  That is, as shown in FIG. 6B, the intake control valve 50 included in the intake device 1D includes three blades, that is, a first blade plate 51, a second blade plate 52, and a third blade plate 53. Is included. The blades 51 and 52 are connected via side plates 54 and 55 at both ends, and the blades 52 and 53 are connected via side plates 56 and 57 at both ends. Each of the blades 51, 52, and 53 is disposed substantially parallel to each other with a predetermined interval. The first communication passage 58 formed between the second blade plate 52 and the third blade plate 53 is formed so that the side plates 56 and 57 narrow the passage width. Similarly, the second communication passage 59 formed between the first blade plate 51 and the second blade plate 52 is formed so that the side plates 54 and 55 narrow the passage width.

  The intake device 1D strongly scrapes off the fuel FU adhering to the lower surface of the partition plate 4 by the partial intake flow SGS-1 that has passed through the first communication path 58 in the half-open state shown in FIG. be able to. At this time, the partial intake flow SGS-2 that has passed through the second communication passage 59 assists in transporting the scraped fuel FU to the combustion chamber side. FIG. 7 is a view showing the small opening state of the intake device 1D. In the small open state, a partial intake flow SGS-2 that has passed through the second communication path 59 formed between the first blade plate 51 and the second blade plate 52 adheres to the lower surface of the partition plate 4. Since the fuel FU to be scraped off is strongly scraped, it is possible to suppress the fuel from staying on the second intake passage 6 side.

  As is apparent from the above description, according to the intake device 1D of the fourth embodiment, not only in the half-open state, but also in the small open state in which the tumble flow is strengthened, the partial intake flow SGS with the increased flow velocity is partitioned. It is possible to suppress the fuel FU from adhering to the lower surface of the plate 4. In addition, although the intake control valve 50 of the intake device 1D exemplifies a structure in which both the first communication path 58 and the second communication path 59 are narrowed, a structure in which only one of the paths is narrowed is adopted. May be.

  In the embodiment described above, the blade plate is a flat member, and these are arranged substantially in parallel. However, the present invention is not limited to such a form. The vane plate may be flat or bent as long as it is a plate-like member constituting the valve. Moreover, what is necessary is just to have a space | interval between blades, for example, you may arrange | position so that the space | interval of a downstream side may become narrower than an upstream.

  FIG. 8 is a diagram illustrating an intake device 1E according to the fifth embodiment. In the first to fourth embodiments described above, the case where the communication passage functioning as the communication portion is provided on the intake control valve side is shown, but the present invention is not limited to such a form. This Example 5 has shown about the case where a communicating part is provided in the partition plate side. Also in the fifth embodiment, the same reference numerals are assigned to the same portions as those of the intake device 1A of the first embodiment in order to avoid redundant description.

  The partition plate 60 included in the intake device 1E has a through hole 61 formed so as to communicate the first intake passage 5 and the second intake passage 6. The through hole 61 is formed in a slit shape extending in the width direction (direction perpendicular to the intake air flow GS), for example. The through hole 61 may be formed so that the partition plate 60 is divided into two in the direction of the intake air flow GS, or may be formed so that a connection portion remains at the end.

  A louver plate 62 is provided on the lower surface side (second intake passage 6 side) of the partition plate 60 so that the base end is in the vicinity of the through hole 61 and faces the through hole 61. The open end 62a of the louver plate 62 extends toward the downstream side of the intake air flow GS. The intake control valve 10 of the intake device 1E is a plate-like member, and is rotated from the fully open state to the half open state shown in FIG. 8 by the actuator 17 controlled by the ECU 18.

  When the intake device 1E is in the half-open state shown in FIG. 8, a part SGS of the intake air flow GS flowing through the first intake passage 5 enters the second intake passage 6 through the through hole 61 functioning as a communication portion. . Since the louver plate 62 is disposed on the lower surface of the partition plate 60, the partial intake air flow SGS flows along the lower surface of the partition plate 60. Therefore, the fuel FU adhering to the lower surface of the partition plate 60 due to the partial intake air flow SGS can be prevented, and the adhering fuel FU can be scraped off.

  As is clear from the above description, the fuel FU adhering to the lower surface of the partition plate 60 can also be scraped off by the intake device 1E of the fifth embodiment, so that it is possible to suppress the fuel from staying on the second intake passage 6 side. . Even when the intake device 1E is used, it is possible to prevent a situation in which the fuel staying on the control passage side suddenly flows, so that the combustion efficiency of the internal combustion engine and the emission can be improved. In addition, a stable output can be obtained by suppressing the torque fluctuation of the internal combustion engine.

(Modification)
FIG. 9 is a view showing a modification of the fifth embodiment. (A) forms the inner wall 61a of the through-hole 61 by the side where the partial intake air flow SGS collides in the taper shape. When the shape of the through hole 61 is changed in this way, the partial intake flow SGS is easily guided to the second intake passage 6 side. Further, (B) shows a modification in which the position of the partition plate 60 is further offset to the first intake passage 5 side by the length h. When the arrangement of the partition plate 60 and the shape of the through hole 61 are changed in this way, it becomes easier to guide a part of the intake air flow SGS to the second intake passage 6 side.

  FIG. 10 is a diagram illustrating the structure of the intake control valve 70 of the intake device 1F according to the sixth embodiment. In the above-described fifth embodiment, the case where the through hole 61 and the louver plate 62 are provided in the partition plate 60 to form the communicating portion has been described, but in the sixth embodiment, the through hole 71 and the louver plate 72 are provided in the intake control valve. The case where it is provided is shown.

  The intake control valve 70 of the intake device 1F also has a through hole 71 formed so as to communicate the first intake passage 5 and the second intake passage 6, and the base end is penetrated on the lower surface side of the intake control valve 70. A louver plate 72 is provided in the vicinity of the hole 71 so as to face the through hole 71. The open end 72a of the louver plate 72 extends toward the downstream side of the intake air flow GS.

  When the intake control valve 70 is in the half-open state shown in FIG. 10, a part of the intake air flow GS flowing through the first intake passage 5 enters the second intake passage 6 through the through hole 71. Since the louver plate 72 is disposed on the lower surface of the intake control valve 70, the partial intake flow SGS flows along the lower surface of the partition plate 4 after flowing along the lower surface of the intake control valve 70. . Therefore, the fuel FU adhering to the lower surface of the partition plate 4 due to the partial intake air flow SGS can be prevented, and the adhering fuel FU can be scraped off. As is clear from the above description, the fuel FU adhering to the lower surface of the partition plate 4 can be scraped off also by the intake device 1F of the sixth embodiment, so that the fuel can be prevented from staying on the second intake passage 6 side. .

  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.

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure shown about the intake device which concerns on Example 1, (A) is the figure which showed the whole structure of the intake device, (B) is the perspective view which extracted and showed the intake control valve contained in the intake device. is there. It is the figure shown about the intake device which concerns on Example 2. FIG. It is the figure which showed a mode that the intake control valve of the intake device of FIG. 2 rotates, (A) is a full open state, (B) is a half open state, (C) is a figure which shows a small open state. . It is the figure shown about the small open state of the intake device of FIG. FIG. 6 is a view showing an intake device according to a third embodiment. FIG. 10 is a view showing an intake device according to a fourth embodiment. It is the figure shown about the small open state of the intake device of FIG. It is the figure shown about the intake device which concerns on Example 5. FIG. FIG. 10 is a view showing a modified example of the fifth embodiment. FIG. 10 is a view showing the structure of an intake control valve of an intake device according to Embodiment 6. It is the figure shown about the conventional intake device.

Explanation of symbols

1A to 1F Intake device 3 Intake pipe 4, 60 Partition plate 5 First intake passage 6 Second intake passage 20, 30, 40, 50, 70 Intake control valve 25 Communication passage 38, 39 Communication passage 45 Communication passage 58, 59 Communication Passage 61 Through-hole 62 Louver plate FU Fuel GS Intake flow CGS Backflow intake flow

Claims (9)

An intake device for an internal combustion engine having a partition plate along the longitudinal direction in the intake pipe to divide the interior into a first intake passage and a second intake passage, and an intake control valve for opening and closing the second intake passage In
When the intake control valve closes the second intake passage, a communication portion is provided that allows a part of the intake air toward the combustion chamber to flow along the partition plate on the second intake passage side. An intake device for an internal combustion engine. The said intake control valve is provided with the said communication part, This communication part rectifies | straightens so that a part of said intake air may flow along the said partition plate by the side of the said 2nd intake passage. An intake device for an internal combustion engine. The intake control valve is pivotally supported so as to rotate in the intake pipe, and a second vane that is disposed at an interval from the first vane plate and rotates integrally with the first vane plate. Including slats,
The intake device for an internal combustion engine according to claim 2, wherein the communication portion is formed by the first blade plate and the second blade plate. The intake control valve includes a vane plate that is pivotally supported and rotates in the intake pipe, and the communication portion has a through hole provided in the vane plate, and faces the through hole so as to extend downstream. The intake device for an internal combustion engine according to claim 2, wherein the intake device is formed by a louver plate disposed on a blade plate. A partition plate is provided in the intake pipe along the longitudinal direction to divide the interior into a first intake passage and a second intake passage, and to open and close the second intake passage and to reduce the first intake passage. An intake device for an internal combustion engine including a control valve,
A first communication portion for flowing a part of the intake air toward the combustion chamber along the partition plate on the second intake passage side when the intake control valve closes the second intake passage; and An internal combustion engine comprising: a second communication portion that causes a part of the intake air toward the combustion chamber to flow along the partition plate on the second intake passage side when the first intake passage is reduced. Inhalation device. The intake control valve includes the first communication portion and the second communication portion, and a part of the intake air flows along the partition plate on the second intake passage side in the first communication portion and the second communication portion. 6. The intake device for an internal combustion engine according to claim 5, wherein rectification is performed as described above. The intake control valve is pivotally supported so as to rotate in the intake pipe, and the second blade plate is disposed at a distance from the first blade plate and rotates integrally with the first blade plate. Including a blade, and a third blade disposed with a distance from the second blade and rotating integrally with the first blade,
The first communication portion is formed by the second blade plate and the third blade plate, and the second communication portion is formed by the first blade plate and the second blade plate. The intake device for an internal combustion engine according to claim 5, wherein 8. The intake device for an internal combustion engine according to claim 3, wherein a passage of the communication portion is gradually narrowed toward the downstream side of the intake air. An intake device for an internal combustion engine having a partition plate along the longitudinal direction in the intake pipe to divide the interior into a first intake passage and a second intake passage, and an intake control valve for opening and closing the second intake passage In
An intake device for an internal combustion engine, characterized in that the partition plate includes a through hole and a louver plate disposed on the partition plate so as to face the through hole and extend downstream.

Images