JP2019127927A - Intake device - Google Patents

Abstract

To provide an intake device which can reduce a difference of distribution amounts of air between a plurality of downstream-side intake passages.SOLUTION: In this intake device 100, a rectification part 11 which is formed so as to be inclined to a direction separating from a center of an X-axis direction toward a plurality of downstream-side opening parts 31a, 32a and 33a from the vicinity of an upstream-side opening part 20a is arranged at a surge tank 10, and a partition portion 12 in which the surge tank 10 is partitioned by the rectification part 11, and a communication portion 13 which is formed so as to communicate at a downstream side rather than the partition portion 12 are arranged. In the partition part 12, the rectification part 11 is arranged so that a flow of air from the upstream-side opening part 20a is divided into a plurality of regions.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake device, and more particularly to an intake device including a surge tank.

  Conventionally, an intake device including a surge tank is known (see, for example, Patent Document 1).

  In the patent document 1, a surge tank and four separate ports each of which is connected to the surge tank are arranged, and the four independent intake passages (downstream side intake passages) arranged in the arrangement direction and the independent intake passage are provided. An intake manifold is disclosed that includes an intake passage (upstream intake passage) including an introduction port that is disposed in the center portion in the arrangement direction of the above and that is connected to a surge tank. The surge tank of this intake manifold protrudes so as to face the inlet at substantially the center of the arrangement direction between two of the four branch ports and the remaining two branch ports. The part is formed. In this intake manifold, when the intake air introduced from the inlet collides with the surface provided with the projecting portion, the flow direction of the intake air is changed to the direction along the arrangement direction, and the intake air is divided into two. The flow is divided into two flows, a flow toward the branch port and a flow toward the remaining two branch ports.

JP 2005-48735 A

  However, in the intake manifold described in Patent Document 1, when the flow direction of the intake air is changed to the direction along the arrangement direction, among the branch openings arranged in the arrangement direction, While a large amount of intake air is supplied, there is a disadvantage in that a small amount of intake air is supplied at the branch port far from the protrusion. As a result, in the intake manifold described in Patent Document 1, there is a problem that the difference in the distribution amount of the intake air between the individual intake passages is not sufficiently reduced.

  The present invention has been made to solve the above-described problems, and one object of the present invention is an intake air capable of reducing a difference in the amount of air distribution between a plurality of downstream intake passages. It is providing a device.

  In order to achieve the above object, an intake system according to one aspect of the present invention includes a surge tank and an upstream opening connected to the surge tank, and introduces air into the surge tank via the upstream opening. A plurality of downstream intake passages, each including an upstream intake passage and a downstream opening connected to the surge tank, and a plurality of downstream intake passages for introducing air from the surge tank to each of the plurality of cylinders The plurality of downstream openings of the intake passage are arranged side by side in the first direction in which the plurality of cylinders are arranged, and the upstream opening of the upstream intake passage is a flow direction of air in the plurality of downstream openings and Between a pair of downstream openings at the center in the first direction of the plurality of downstream openings or between a pair of downstream openings at the center in the first direction in plan view from the second direction orthogonal to the first direction Oriented to The tank is formed to be inclined in the direction away from the center in the first direction from the vicinity of the upstream opening toward the plurality of downstream openings, and is directed to the downstream opening on the center side in the first direction A rectifying unit that divides the air flow and the air flow toward the downstream opening on the direction side away from the central side in the first direction, and a partition part in which the surge tank is partitioned by the rectifying unit; And a communication portion formed so as to communicate with the downstream side further than the air flow from the upstream opening as viewed from the upstream side in the flow direction in the partition portion. As shown, the rectification unit is arranged.

  Note that the “first upstream side of the plurality of downstream openings is a plan view of the upstream side opening of the upstream side intake passage from the second direction orthogonal to the flow direction of the air and the first direction in the plurality of downstream side openings. `` Directed between the downstream opening at the center in the direction or between the pair of downstream openings at the center in the first direction '' means that the air flowing through the upstream opening in the plan view from the second direction A plane from the second direction with the upstream opening and the downstream opening arranged so that the flow and the air flow through the downstream opening are in the same direction. The position of the upstream opening in the first direction is between the downstream opening at the center in the first direction of the plurality of downstream openings, or between the pair of downstream openings at the center in the first direction. It means a state of being located. Further, the “rectifying portion is formed so as to be inclined in the direction away from the center in the first direction from the vicinity of the upstream opening toward the plurality of downstream openings”, the rectifying portion is the upstream opening From the position flush with the upstream opening, it is not limited to the case where it is formed so as to be inclined in a direction away from the center of the first direction from the position spaced from the gap toward the plurality of downstream openings. The case where it forms so that it may incline in the direction away from the center of a 1st direction toward several downstream opening parts is also included.

  In the intake system according to one aspect of the present invention, as described above, the flow of the air toward the downstream side opening in the center in the first direction and the downstream in the direction away from the center in the first direction The air introduced into the surge tank is divided into the air flow toward the side opening. Thus, the flow of air from the upstream opening directed toward the center in the first direction is caused not only by the downstream opening on the center side in the first direction but also from the center side in the first direction by the rectifying unit. Air can also be guided to the downstream opening on the side. Thereby, the distribution amount of the air supplied to the downstream side opening on the center side in the first direction and the air supplied to the downstream side opening on the direction side away from the center side in the first direction can be made closer. Therefore, the difference in the amount of air distribution between the plurality of downstream intake passages can be reduced.

  In the intake device according to the above aspect, as described above, the surge tank is away from the center of the first direction in which the plurality of cylinders are arranged from the vicinity of the upstream opening toward the plurality of downstream openings. In order to divide the flow of air from the upstream opening as viewed from the upstream side of the flow direction into multiple regions. Place. Thus, the air introduced into the surge tank from the upstream opening can be reliably divided in the divided portion and provided to be inclined in the direction away from the center in the first direction in which the plurality of cylinders are arranged. The rectifying unit can reliably supply the divided air to the downstream opening on the direction side away from the center side. As a result, it is possible to reliably suppress an increase in the difference in air distribution amount between the plurality of downstream intake passages.

  In the intake system according to the above aspect, as described above, the upstream side opening of the upstream side intake passage is a second direction orthogonal to the flow direction and the first direction of the air at the plurality of downstream side openings. In plan view, the plurality of downstream openings are directed between the downstream openings in the center in the first direction or between the pair of downstream openings in the center in the first direction. Thereby, compared with the case where the upstream opening is not directed to the plurality of downstream openings, the air introduced from the upstream opening to the surge tank can be directly guided to the downstream opening. Therefore, it is possible to suppress an increase in the flow path resistance of the air flowing through the intake device. As a result, air can be efficiently supplied to each cylinder of the engine.

  Furthermore, in the intake device according to the above aspect, as described above, the surge tank is provided with a communication portion formed to communicate with the downstream side of the partition portion. Thus, unlike in the case where the entire surge tank is partitioned, a communicating portion as a space for damping pulsation generated in the engine cylinder can be secured, so that a decrease in intake efficiency caused by the pulsation can be suppressed. it can.

  In the intake system according to the aforementioned aspect, the rectifying portion preferably extends from the first inner surface on one side in the second direction to the second inner surface on the other side in the second direction in the surge tank.

  According to this structure, the movement of air between the plurality of sections can be reliably suppressed while the flow of the air from the upstream opening is surely divided into the plurality of sections in the section portion.

  In the intake system according to the aforementioned aspect, preferably, the straightening unit is curved so that the rate of separation from the center in the first direction gradually increases from the upstream opening side toward the plurality of downstream openings. Yes.

  According to this structure, the flow direction of the air gradually changes in the direction away from the center side in the first direction, and therefore, compared to the case where the flow direction of the air collides with the rectifying portion and the flow direction of the air is sharply changed. It is possible to reliably suppress an increase in the flow resistance of the air guided to the downstream opening on the direction side away from the center side in the first direction.

  In the intake device according to the above aspect, the number of the plurality of cylinders and the downstream intake passages is preferably three, and the air flow from the upstream opening as viewed from the upstream side of the upstream opening in the partition portion The flow straightening unit is disposed such that the flow is divided into the flow to the first area and the second area on both sides in the first direction and the flow to the central third area in the first direction, Both the channel cross-sectional area and the channel cross-sectional area of the second region are larger than the channel cross-sectional area of the third region.

  With this configuration, when the number of the plurality of cylinders and the downstream side intake passages is 3, the regions on both sides (the first region and the first region) in which the amount of air flow tends to be smaller than the third region on the central side. Since the air circulation amount in the (2 region) can be increased, air can be easily guided to the downstream opening on the direction side away from the center side in the first direction. Thereby, it is possible to reliably suppress an increase in the difference in the air distribution amount between the plurality of downstream intake passages.

  In the intake device according to the above aspect, the number of the plurality of cylinders and the downstream intake passages is preferably four, and the air flow from the upstream opening as viewed from the upstream side of the upstream opening in the partition portion The flow straightening unit is disposed such that the flow is divided into the flow to the first area and the second area on both sides in the first direction and the flow to the central third area in the first direction, The flow passage cross-sectional area of the second region and the flow passage cross-sectional area of the second region are both larger than 1/4 of the flow passage cross-sectional area of the upstream opening, and the flow passage cross-sectional area of the third region is It is less than 1/2 of the channel cross sectional area.

  With this configuration, in the case where the number of the plurality of cylinders and the downstream side intake passages is four, the regions on both sides (the first region and the first region) in which the amount of air flow tends to be smaller than in the third region on the central side. Since the air circulation amount in the (2 region) can be increased, air can be easily guided to the downstream opening on the direction side away from the center side in the first direction. Thereby, it is possible to reliably suppress an increase in the difference in the air distribution amount between the plurality of downstream intake passages.

  In the intake device according to the one aspect, preferably, the surge tank is formed by joining the first piece and the second piece, and the rectification unit is provided in the first piece, and the inner side of the surge tank. A first rectifying portion projecting toward the second portion, and an inner end portion provided on the second piece and projecting toward the inside of the surge tank and disposed in the vicinity of the inner end portion of the first rectifying portion. 2 includes a rectifying unit. In the case of “disposed in the vicinity of the inner end of the first rectifying unit”, the inner end of the first rectifying unit and the inner end of the second rectifying unit are opposed to each other with a slight gap. However, the present invention is not limited to the case where the inner end of the first rectifying unit and the inner end of the second rectifying unit are in contact with each other.

  If comprised in this way, a surge tank can be formed easily compared with the case where the whole surge tank is formed integrally. In addition, since the inner end of the second rectification unit is disposed oppositely in the vicinity of the inner end of the first rectification unit, the first rectification unit and the second piece of the first piece provided on different members, respectively. The surge tank can be sufficiently divided by the second rectifying unit. Thereby, even if the surge tank is formed of a plurality of pieces, the difference in the amount of air distribution between the plurality of downstream intake passages can be reliably reduced.

  In the present application, the following configuration is also conceivable in the intake device according to the above aspect.

(Appendix 1)
That is, in the intake device according to the above aspect, the rectifying unit is substantially mirror-image symmetric with respect to a symmetry plane that passes through the approximate center of the first direction in the plurality of downstream openings and extends in the flow direction and the second direction. It is formed as.

(Appendix 2)
In the intake system according to the aforementioned aspect, the rectifying portion is formed in a plate shape.

(Appendix 3)
In the intake device according to the one aspect described above, the surge tank is formed over both the partition portion and the communication portion, and is formed in the wall portion that forms the rectification portion in the partition portion and the communication portion, and penetrates the wall portion. And a hole to be formed.

1 is a side view schematically showing an overall configuration of an in-line three-cylinder engine including an intake device according to a first embodiment of the present invention. FIG. 7 is a cross-sectional view taken along line 700-700 in FIG. FIG. 3 is a cross-sectional view taken along line 710-710 in FIG. FIG. 7 is a sectional view taken along line 720-720 in FIG. 3. It is the side view which showed roughly the whole structure of the inline 4 cylinder engine provided with the intake device by 2nd Embodiment of this invention. FIG. 7 is a cross-sectional view taken along line 730-730 in FIG. FIG. 7 is a cross-sectional view taken along line 740-740 in FIG. 6. FIG. 8 is a cross-sectional view taken along line 750-750 in FIG. 7. FIG. 7 is a side view showing an intake system according to a third embodiment of the present invention. FIG. 10 is a cross-sectional view taken along the line 760-760 in FIG. 9. It is sectional drawing of the surge tank periphery by the 1st modification of 1st Embodiment of this invention. It is sectional drawing of the surge tank periphery by the 2nd modification of 1st Embodiment of this invention. It is sectional drawing of the surge tank periphery by the 3rd modification of 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

First Embodiment
With reference to FIGS. 1-4, the structure of the inline 3 cylinder engine 1 (an example of an engine) provided with the intake device 100 by 1st Embodiment of this invention is demonstrated. In the first embodiment, when the in-line three-cylinder engine 1 is used as a reference, the cylinders 2 are arranged along the X-axis direction (an example of the first direction), and the direction is perpendicular to the X-axis in the horizontal plane. Is the Y-axis direction. In addition, the description will be made assuming that the vertical direction in a state where the intake device 100 (in-line three-cylinder engine 1) is mounted on a vehicle (not shown) (vehicle mounted state) is the Z-axis direction.

<Configuration of in-line three-cylinder engine>
As shown in FIGS. 1 and 2, the in-line three-cylinder engine 1 includes a cylinder head 1a, a cylinder block 1b, and a crankcase 1c. The in-line three-cylinder engine 1 is provided with three cylinders 2. Further, in the in-line three-cylinder engine 1, the cylinders 2a, 2b, and 2c are arranged in this order from the X1 direction side to the X2 direction side.

<Configuration of Intake Device>
The intake device 100 is provided to supply air to each cylinder 2 of the in-line three-cylinder engine 1. The intake system 100 is fixed to the side surface of the inline 3-cylinder engine 1 in the Y1 direction.

  The intake device 100 includes a surge tank 10, an upstream intake passage 20 disposed on the upstream side of the surge tank 10, and three downstream intake passages 30 (31, 32 and 31) disposed on the downstream side of the surge tank 10. 33) includes an intake device body 40 provided therein. The intake device body 40 may be made of resin or metal.

  A flange portion 40 a for attaching a throttle portion (not shown) having a throttle valve is formed at the upstream end portion of the intake device main body 40. A flange portion 40 b for fixing the intake device 100 to the cylinder head 1 a of the in-line three-cylinder engine 1 is formed at the downstream end of the intake device main body 40.

  The surge tank 10 is formed of a large space having a flow passage cross-sectional area larger than the flow passage cross-sectional area of the upstream side intake passage 20 and the flow passage cross-sectional area of the downstream side intake passage 30. The surge tank 10 has a function of attenuating pulsation generated in the plurality of cylinders 2 of the in-line three-cylinder engine 1. The surge tank 10 has a substantially rounded rectangular shape whose longitudinal direction is the X-axis direction when viewed from the Y-axis direction, and is formed in a substantially circular shape when viewed from the X-axis direction.

  The upstream side intake passage 20 has a function of guiding the air introduced from the throttle portion to the surge tank 10. An upstream opening 20 a connected to the surge tank 10 is formed at the downstream end of the upstream intake passage 20.

  As shown in FIG. 1, the upstream opening 20 a is formed such that the center in the X axis direction is located substantially at the center O in the X axis direction of the surge tank 10 when viewed from the Y axis direction. Further, as shown in FIG. 2, the upstream side opening 20 a is formed on the Z2 direction side of the surge tank 10 and on the Y1 direction side. Further, as shown in FIGS. 1 and 2, the upstream intake passage 20 is provided so as to be inclined toward the Y1 direction toward the Z2 direction, and is formed to extend along the Z axis direction. Yes. As a result, the upstream intake passage 20 is formed so that air flows in the Z1 direction when viewed from the Y-axis direction.

  The three downstream intake passages 31, 32 and 33 are arranged at substantially equal intervals in the X-axis direction in which the three cylinders 2 are arranged, and in this order from the X1 direction side to the X2 direction side. It is arranged. The downstream side intake passages 31, 32 and 33 correspond to the cylinders 2a, 2b and 2c, respectively, and have a function of guiding the air introduced from the surge tank 10 to the corresponding cylinder 2. At the upstream end of the three downstream intake passages 31, 32 and 33, downstream openings 31a, 32a and 33a connected to the surge tank 10 are formed, respectively.

  As shown in FIG. 1, the downstream opening 31 a is located on the X1 direction side of the surge tank 10 in the X-axis direction. The downstream opening 32a located at the center in the X-axis direction is formed so that the center in the X-axis direction is located at the center O in the X-axis direction of the surge tank 10 when viewed from the Y-axis direction. The downstream opening 33 a is located on the X2 direction side of the surge tank 10 in the X-axis direction. The downstream intake passage 31 and the downstream intake passage 33 pass through the center O in the X-axis direction of the three downstream openings 31a, 32a and 33a, and extend in the circulation direction (Z1 direction) and the Y-axis direction On the other hand, it is formed so as to be substantially mirror image symmetric.

  Further, as shown in FIG. 2, the downstream side intake passage 32 extends from the downstream side opening 32a in the Z1 direction (upward), is curved toward the Y2 direction side, and is formed to extend in the Y2 direction. Yes. The downstream side intake passage 32 is configured to be connected to the cylinder 2 of the in-line three-cylinder engine 1 (specifically, the intake port of the in-line three-cylinder engine 1). As a result, the downstream intake passage 32 is formed so as to connect the surge tank 10 and the corresponding cylinder 2b of the in-line three-cylinder engine 1.

  The downstream intake passages 31 and 33 have the same configuration as the downstream intake passage 32 except for the formation position in the X-axis direction. That is, the downstream intake passages 31 and 33 connect the surge tank 10 and the corresponding cylinders 2a and 2c, respectively.

  As shown in FIG. 3, the downstream side openings 31 a, 32 a and 33 a are formed on the Z1 direction side of the surge tank 10. Further, the downstream openings 31a, 32a, and 33a are all formed so that air flows in the Z1 direction when viewed from the Y-axis direction.

  The upstream opening 20a of the upstream intake passage 20 has an air flow direction (Z1 direction) in the three downstream openings 31a, 32a and 33a and a Y-axis direction (an example of the second direction) orthogonal to the X-axis direction. ) Of the three downstream openings 31a, 32a, and 33a, the center is oriented toward the center downstream opening 32a in the X-axis direction. Specifically, the upstream side opening 20a is formed to face the central downstream side opening 32a in the X-axis direction in plan view from the Y-axis direction, and the X of the upstream side opening 20a is The center in the axial direction substantially coincides with the center in the X-axis direction of the downstream opening 32a. Further, the upstream opening 20a of the upstream intake passage 20 and the downstream opening 31a (32a, 33a) of the downstream intake passage 31 (32, 33) are both in the Z1 direction as viewed from the Y-axis direction. The air is formed to flow toward the

  The upstream opening 20a is formed on the Y1 direction side of the three downstream openings 31a, 32a, and 33a in plan view from the X-axis direction.

  Here, in 1st Embodiment, the surge tank 10 is provided with the division part 12 divided by the rectification | straightening part 11, and the communication part 13 formed so that it may communicate in the downstream rather than the division part 12. FIG. Yes. Specifically, in plan view from the Y-axis direction, the partition portion 12 is provided on the Z2 direction side of the surge tank 10 in which the upstream side opening 20a is formed, and the communication portion 13 is a surge tank 10 is provided on the Z1 direction side where the downstream openings 31a, 32a and 33a are formed. The partition portion 12 is formed from the vicinity of the upstream opening 20a of the surge tank 10 to the approximate center of the surge tank 10 in the Z-axis direction. The communication portion 13 is formed downstream of the approximate center of the surge tank 10 in the Z-axis direction. In the partition portion 12, most of the air passing through the upstream opening 20a is divided into three partitions (a first partition C1 on the X1 direction side, a second partition C2 on the X2 direction side, and a third partition C3 at the center in the X direction). To be slightly divided from the upstream opening 20a (near the upstream opening 20a).

  The rectifying unit 11 is integrally formed with the surge tank 10. That is, the rectifying unit 11 extends from the inner surface 40c (an example of the first inner surface) on the Y1 direction side of the portion where the surge tank 10 of the intake device body 40 is formed to the inner surface 40d (an example of the second inner surface) on the Y2 direction side. Thus, it is integrally formed with the intake device main body 40.

  Further, in the first embodiment, the rectifying unit 11 is formed over the entire partition portion 12. That is, the rectifying unit 11 is formed to extend from the vicinity of the upstream opening 20 a of the surge tank 10 toward the downstream openings 31 a, 32 a, and 33 a. Here, when air is introduced from the upstream opening 20 a to the surge tank 10 by providing the rectifying unit 11 near the upstream opening 20 a of the surge tank 10, the flow passage cross-sectional area is large. The change is suppressed. Thereby, it is possible to reduce the pressure loss resulting from a large change in the flow path cross-sectional area.

  Moreover, the rectification | straightening part 11 inclines in the X2 direction side toward the wall part 14 which inclines in the X1 direction side toward the downstream opening part 31a, 32a, 33a side, and the approximate center of the Z-axis direction of the surge tank 10. And a wall portion 15. The walls 14 and 15 are inclined so as to be separated from the center O in the X-axis direction of the surge tank 10 in the X1 direction and the X2 direction, respectively. Further, the upstream ends 14a and 15a of the walls 14 and 15 are both located in the vicinity of the upstream opening 20a. Both the downstream end portions 14b and 15b of the wall portions 14 and 15 are located at the approximate center of the surge tank 10 in the Z-axis direction.

  As a result, as shown in FIG. 4, in the dividing portion 12, when viewed from the upstream side of the upstream opening 20 a, the air flow F0 from the upstream opening 20 a is the first on the X1 direction X1 direction side The flow straightening unit is divided into the flow F1 to the region R1, the flow F2 to the second region R2 on the X2 direction side in the X-axis direction, and the flow F3 to the third region R3 in the center of the X-axis direction 11 are arranged.

  As shown in FIG. 3, the walls 14 and 15 have a central O in the X-axis direction from the upstream opening 20a side (Z2 direction side) toward the downstream openings 31a, 32a, and 33a side (Z1 direction side). It curves so that the rate of leaving from becomes large gradually. Further, as shown in FIG. 4, the wall portions 14 and 15 are formed in a plate shape which is small in the thickness direction. In order to suppress the wall resistances 14 and 15 from becoming flow resistance when the upstream opening 20a is introduced into the surge tank 10, the thickness of the walls 14 and 15 is the strength as a wall. Is preferably as small as possible.

  Also, as shown in FIG. 3, the walls 14 and 15 pass through the approximate center O in the X-axis direction of the three downstream openings 31a, 32a and 33a, and extend in the Z-axis direction and the Y-axis direction. , And are formed so as to be substantially mirror-image symmetrical.

  The wall 14 in the vicinity of the downstream end 14 b is located on the tangent L 1 slightly in the X 2 direction with respect to the X axis direction center of the downstream opening 31 a in the X 1 direction. As a result, the air that has flowed into the first region R1 is gradually changed in the section 12 toward the vicinity of the center of the downstream opening 31a by the curved wall portion 14. At this time, in the partition portion 12, the air that has flowed into the first partition C1 does not move to the second partition C2 adjacent in the X-axis direction. And the air which goes to the center vicinity of the downstream opening part 31a passes the communicating part 13, and is introduce | transduced into the downstream intake passage 31 from the downstream opening part 31a.

  Similarly, the wall 15 near the downstream end 15b is located on the tangent L2 slightly in the X1 direction with respect to the center of the downstream opening 33a in the X2 direction. As a result, the air flowing into the third region R3 is gradually changed in the section 12 toward the vicinity of the center of the downstream opening 33a by the curved wall 15. Under the present circumstances, in the division part 12, the air which flowed in into the 3rd division C3 does not move to the 2nd division C2 adjacent to an X-axis direction. And the air which goes to the center vicinity of the downstream opening part 33a passes the communicating part 13, and is introduce | transduced into the downstream intake passage 33 from the downstream opening part 33a.

  On the other hand, the air flowing into the second region R2 is introduced into the downstream intake passage 32 from the downstream opening 32a. At this time, in the partition portion 12, the air that has flowed into the second section C2 does not move to the first section C1 and the third section C3 adjacent in the X-axis direction.

  Further, in the first embodiment, as shown in FIG. 4, both the flow passage cross-sectional area S1 of the first region R1 and the flow passage cross-sectional area S2 of the second region R2 are the flow passage cross-sectional area S3 of the third region R3. Greater than. Further, the flow channel cross-sectional area S1 of the first region R1 and the flow channel cross-sectional area S2 of the second region R2 are substantially equal. The flow passage cross-sectional area S1 of the first region R1 and the flow passage cross-sectional area S2 of the second region R2 are both the flow passage cross-sectional area S0 of the upstream side opening 20a viewed from the upstream side of the upstream side opening 20a. Preferably it is greater than 1/3. Further, the flow path cross-sectional area S3 of the third region R3 is preferably less than 1/3 of the flow path cross-sectional area S0 of the upstream opening 20a. The flow passage cross-sectional area S1 of the first region R1, the flow passage cross-sectional area S2 of the second region R2, and the flow passage cross-sectional area S3 of the third region R3 are all flow of air flowing through the upstream opening 20a. It means the area in the cross section orthogonal to the direction.

  As shown in FIG. 3, in the communicating portion 13, unlike the dividing portion 12, the rectifying portion 11 (plate-like wall portions 14 and 15) is not provided. Thereby, a space having a large flow path cross-sectional area is formed in the communication portion 13. As a result, the pulsation generated in a certain cylinder 2 and introduced into the surge tank 10 is attenuated in the communication portion 13, so that the reduction of the intake efficiency due to the pulsation is suppressed.

(Effect of the first embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the flow of air toward the downstream side opening 32a on the center side in the X-axis direction by the rectifying unit 11, and the downstream side opening on the side away from the center side in the X-axis direction The air introduced into the surge tank 10 is divided into the air flow toward 31a and 33a. As a result, the flow of air from the upstream opening 20a directed toward the center in the X-axis direction by the rectifying unit 11 is not limited to the downstream opening 32a on the central side in the X-axis direction, but the central side in the X-axis direction. The air can also be guided to the downstream openings 31a and 33a on the side away from the direction. As a result, the distribution amounts of the air supplied to the downstream side opening 32a on the center side in the X-axis direction and the air supplied to the downstream side openings 31a and 33a on the side away from the center side in the X-axis direction Since they can be close, the difference in the amount of air distribution among the three downstream intake passages 30 can be reduced.

  In the first embodiment, the surge tank 10 is moved from the vicinity of the upstream opening 20a toward the plurality of downstream openings 31a, 32a and 33a from the center O in the X-axis direction in which three cylinders 2 are arranged. A partition portion 12 provided with the rectifying unit 11 is provided so as to be inclined in a direction away (X1 direction or X2 direction). And in the division part 12, the flow of the air from the upstream side opening part 20a seeing from the upstream (Z2 direction side) of a distribution direction is a some area | region (1st area | region R1, 2nd area | region R2, 3rd area | region R3) The rectifying unit 11 is arranged so as to be divided into two. Thus, the air introduced into the surge tank 10 from the upstream opening 20a can be reliably divided in the partition portion 12 and in a direction away from the center O in the X-axis direction in which the three cylinders 2 are arranged. By the rectifying unit 11 provided so as to be inclined, the divided air can be reliably supplied to the downstream openings 31a and 33a on the direction side away from the center side. As a result, an increase in the difference in the amount of air distribution among the three downstream intake passages 30 can be reliably suppressed.

  Further, in the first embodiment, the upstream opening 20a of the upstream intake passage 20 is arranged so that the air flow direction (Z1 direction) and the X-axis direction in the plurality of downstream openings 31a, 32a, and 33a are orthogonal to the X-axis direction. In plan view from the direction, the light is directed toward the center downstream opening 32a in the X-axis direction. Thus, the air introduced into the surge tank 10 from the upstream opening 20a is directly applied to the downstream openings 31a, 32a and 33a, as compared with the case where the upstream opening is not directed to the downstream opening. It is possible to prevent the flow path resistance of the air flowing through the intake device 100 from becoming large. As a result, air can be efficiently supplied to each cylinder 2 of the in-line three-cylinder engine 1.

  Further, in the first embodiment, the surge tank 10 is provided with the communicating portion 13 formed to communicate on the downstream side of the partition portion 12. Thus, unlike the case where the entire surge tank 10 is partitioned, the communication portion 13 as a space for attenuating the pulsation generated in the plurality of cylinders 2 of the in-line three-cylinder engine 1 can be reliably ensured. The resulting reduction in intake efficiency can be suppressed.

  Further, in the first embodiment, the rectifying unit 11 is formed to extend from the inner surface 40c on the Y1 direction side to the inner surface 40d on the Y2 direction side. Thereby, in the partition part 12, the flow of air from the upstream side opening 20a is reliably divided into a plurality of sections (first section C1, second section C2, third section C3), and between the plurality of sections. The movement of air can be reliably suppressed.

  In the first embodiment, the wall portions 14 and 15 of the rectifying unit 11 are moved from the upstream opening 20a side (Z2 direction side) to the three downstream opening portions 31a, 32a and 33a side (Z1 direction side). The curve is made so that the rate of separation from the center O in the X-axis direction gradually increases. As a result, the flow direction of air gradually changes in the direction away from the center O side in the X axis direction, and therefore, the X axis direction is compared with the case where the flow direction of air collides with the straightening part and the flow direction of air is sharply changed. It is possible to reliably suppress an increase in the flow passage resistance of the air led to the downstream side openings 31a and 33a in the direction away from the center O side.

  Further, in the first embodiment, the number of the plurality of cylinders 2 and the downstream side intake passages 30 is 3, and the air from the upstream side opening 20a in the partition portion 12 when viewed from the upstream side of the upstream side opening 20a. Flow F0 to the first region R1 on the X1 direction side in the X axis direction, flow F2 to the second region R2 on the X2 direction side in the X axis direction, and the third region at the center in the X axis direction The rectifying unit 11 is arranged so as to be divided into the flow F3 to R3. Then, both the channel cross-sectional area S1 of the first region R1 and the channel cross-sectional area S2 of the second region R2 are made larger than the channel cross-sectional area S3 of the third region R3. This makes it possible to increase the flow of air in the regions (the first region R1 and the second region R2) on both sides where the flow of air is likely to be reduced compared to the third region R3 on the center side. Air can be easily guided to the downstream side openings 31a and 33a on the direction side away from the center side of the direction. As a result, it is possible to reliably suppress an increase in the difference in the amount of air distribution among the plurality of downstream intake passages 30.

  Moreover, in 1st Embodiment, the rectification | straightening part 11 passes through the approximate center O of the X-axis direction in the three downstream opening parts 31a, 32a, and 33a, and is a symmetrical surface extended in a distribution direction (Z1 direction) and a Y-axis direction. In contrast, it is formed so as to be substantially mirror-image symmetric. Thereby, since the distribution amount of the air divided | segmented by the rectification | straightening part 11 can be approximated in the X1 direction side and the X2 direction side, the difference of the distribution amount of the air between the some downstream intake passages 30 becomes large. Can be reliably suppressed.

  Moreover, in 1st Embodiment, the wall parts 14 and 15 of the rectification | straightening part 11 are formed in plate shape. Thereby, compared with the case where the rectification | straightening part 11 is thick, it can suppress more that the rectification | straightening part 11 becomes flow path resistance of air.

Second Embodiment
Next, the configuration of an in-line four-cylinder engine 201 (an example of an engine) including the intake device 200 according to the second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, unlike the first embodiment in which the intake device 100 is used in the in-line three-cylinder engine 1, a case in which the intake device 200 is used in the in-line four-cylinder engine 201 will be described. In addition, about the same structure as the said 1st Embodiment, while attaching | subjecting the same code | symbol as the said 1st Embodiment, description is abbreviate | omitted.

<Configuration of in-line four-cylinder engine>
The in-line four-cylinder engine 201 is provided with four cylinders 202. In the in-line four-cylinder engine 201, cylinders 202a, 202b, 202c, and 202d are arranged in this order from the X1 direction side to the X2 direction side.

<Configuration of Intake Device>
The intake device 200 includes a surge tank 210, an upstream intake passage 220 disposed on the upstream side of the surge tank 210, and four downstream intake passages 230 (231, 232, 233 and 234) includes an intake device main body 240 provided therein.

  As shown in FIG. 5, the upstream opening 220 a of the upstream intake passage 220 connected to the surge tank 210, when viewed from the Y-axis direction, is substantially at the center O in the X-axis direction of the surge tank 210 in the X-axis direction. The center is formed. Further, the upstream opening 220a is formed on the Z2 direction side of the surge tank 210 as shown in FIG. Further, as shown in FIGS. 5 and 6, the upstream side intake passage 220 is formed so as to extend along the Z-axis direction. As a result, the upstream intake passage 220 is formed so that air flows in the Z1 direction when viewed from the Y-axis direction.

  The four downstream intake passages 231, 232, 233 and 234 are arranged at substantially equal intervals in the X-axis direction in which the four cylinders 202 are arranged, and from the X1 direction side toward the X2 direction side. Arranged in order. The downstream side intake passages 231 to 234 correspond to the cylinders 202a, 202b, 202c and 202d, respectively. At the upstream end of the four downstream intake passages 231, 232, 233 and 234, downstream openings 231a, 232a, 233a and 234a connected to the surge tank 210 are formed, respectively.

  As shown in FIG. 7, among the downstream side openings 231a to 234a, between the pair of downstream side openings 232a and 233a on the center side in the X-axis direction (intermediate point P) is viewed from the Y-axis direction. The center in the X-axis direction is formed at the center O in the X-axis direction of the surge tank 210. Further, the downstream side intake passage 231 and the downstream side intake passage 234 pass through the center O in the X-axis direction in the four downstream openings 231a to 234a and extend in the flow direction (Z1 direction) and the Y-axis direction. On the other hand, it is formed so as to be substantially mirror image symmetric. Similarly, the downstream side intake passage 232 and the downstream side intake passage 233 are formed so as to be substantially mirror-image symmetric with respect to the symmetry plane. Further, the downstream openings 231a to 234a are all formed on the Z1 direction side of the surge tank 210.

  Further, as shown in FIG. 6, the downstream side intake passage 230 has the same shape as the downstream side intake passage 30 of the first embodiment shown in FIG. Further, as shown in FIG. 5, the downstream side intake passages 231 to 234 are formed to connect the surge tank 210 and the corresponding cylinders 202 a to 202 d of the in-line four-cylinder engine 201, respectively. As shown in FIG. 7, the downstream openings 231 a to 234 a of the downstream intake passages 231 to 234 are formed so that air flows in the Z1 direction when viewed from the Y-axis direction.

  The upstream side opening 220a of the upstream side intake passage 220 has four air flow directions (Z1 direction) in the four downstream side openings 231a to 234a and a plan view from the Y axis direction orthogonal to the X axis direction. The downstream openings 231a to 234a are oriented between the pair of downstream openings 232a and 233a on the center side in the X-axis direction. Specifically, the upstream opening 220a is formed so as to face the intermediate point P between the pair of downstream openings 232a and 233a on the center side in the X-axis direction in a plan view from the Y-axis direction. Yes. Furthermore, air flows through the upstream opening 220a of the upstream intake passage 220 and the downstream openings 231a to 234a of the downstream intake passages 231 to 234 in the Z1 direction as viewed from the Y-axis direction. It is formed to be. The upstream opening 220a is formed at substantially the same position as the four downstream openings 231a to 234a in the Y-axis direction in plan view from the X-axis direction.

  Here, in the second embodiment, the surge tank 210 includes three sections (a first section C11 on the X1 direction side, a second section C12 on the X2 direction side, and a third section C13 at the center in the X direction). And a communicating portion 13 formed to communicate on the downstream side of the dividing portion 212. The rectifying unit 211 is formed so as to extend from the upstream opening 220a of the surge tank 210 toward the downstream openings 231a to 234a. That is, the rectifying unit 211 is formed to extend from the position substantially flush with the upstream opening 220 a of the surge tank 210 toward the downstream openings 231 a to 234 a.

  Further, the rectifying unit 211 inclines in the X2 direction side toward the substantial center of the surge tank 210 in the Z axis direction, and the wall portion 214 which inclines in the X1 direction toward the approximate center of the surge tank 210 in the Z axis direction. And a wall portion 215. The walls 214 and 215 are respectively inclined away from the center O in the X-axis direction of the surge tank 210 in the X1 and X2 directions. Further, the upstream ends 214a and 215a of the walls 214 and 215 are both formed to be substantially flush with the upstream opening 220a. Further, the downstream end portions 214b and 215b of the wall portions 214 and 215 are both located on the upstream side (Z2 direction side) of the approximate center of the surge tank 210 in the Z-axis direction.

  As a result, in the partition portion 212, when viewed from the upstream side of the upstream opening 220a, the air flow F10 from the upstream opening 220a and the flow F11 to the first region R11 on the X1 direction side in the X axis direction The rectifying unit 211 is disposed so as to be divided into the flow F12 to the second region R12 on the X2 direction side in the X-axis direction and the flow F13 to the third region R13 at the center in the X-axis direction.

  Note that the walls 214 and 215 are plate-like and curved, as in the first embodiment. Further, the wall portions 214 and 215 are formed to be substantially mirror-symmetrical with respect to a symmetry plane extending in the Z-axis direction and the Y-axis direction, passing through the approximate center O in the X-axis direction.

  The wall 214 near the downstream end 214 b is located on the tangent L 11 toward the X 2 end of the downstream opening 231 a on the X 1 side. As a result, the air that has flowed into the first region R11 is gradually changed in the section 212 toward the downstream opening 231a by the curved wall 214. Similarly, the wall portion 215 in the vicinity of the downstream end portion 215b is located on a tangent line L12 toward the end portion on the X1 direction side of the downstream opening portion 234a on the X2 direction side. As a result, the air that has flowed into the third region R13 is gradually changed in the section 212 toward the downstream opening 234a by the curved wall portion 215. On the other hand, the air that has flowed into the second region R12 is substantially evenly distributed to the air flow F13a toward the downstream opening 232a and the air flow F13b toward the downstream opening 233a, which are substantially mirror-image symmetric.

  In the second embodiment, the flow passage cross-sectional area S11 of the first region R11 and the flow passage cross-sectional area S12 of the second region R12 are both the upstream opening 220a viewed from the upstream side of the upstream opening 220a. It is larger than 1/4 of the channel cross-sectional area S10. Further, the channel cross-sectional area S13 of the third region R13 is less than ½ of the channel cross-sectional area S10 of the upstream opening 220a. In addition, it is preferable that the channel cross-sectional area S13 of the third region R13 is larger than the channel cross-sectional area S11 of the first region R11 and the channel cross-sectional area S12 of the second region R12. In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

(Effect of the second embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, the air flow toward the downstream side opening portions 232a and 233a on the center side in the X-axis direction by the rectifying unit 211, and the downstream side on the side away from the center side in the X-axis direction The air introduced into the surge tank 210 is divided into the air flow toward the openings 231a and 234a. Thereby, the difference of the distribution amount of the air between the four downstream side intake passages 230 can be made small similarly to the said 1st Embodiment.

  Further, in the second embodiment, the number of the plurality of cylinders 202 and the downstream side intake passages 230 is 4, and the air from the upstream side opening 220a in the partition portion 212 when viewed from the upstream side of the upstream side opening 220a. Flow F10 to the first region R11 on the X1 direction side of the X axis direction, flow F12 to the second region R12 on the X2 direction side, and the third region at the center in the X axis direction The rectifying unit 211 is arranged so as to be divided into the flow F13 to R13. Then, both the channel cross-sectional area S11 of the first region R11 and the channel cross-sectional area S12 of the second region R12 are both of the channel cross-sectional area S10 of the upstream opening 220a viewed from the upstream side of the upstream opening 220a. While being larger than 1/4, the flow path cross-sectional area S13 of the third region R13 is set to be less than 1/2 of the flow path cross-sectional area S10 of the upstream opening 220a. This makes it possible to increase the flow of air in the two regions (the first region R11 and the second region R12) in which the flow of air is likely to be reduced compared to the third region R13 on the center side. Air can be easily guided to the downstream side openings 231a and 234a on the direction side away from the center side of the direction. As a result, it is possible to reliably suppress an increase in the difference in the air distribution amount between the plurality of downstream-side intake passages 230. In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

Third Embodiment
Next, an intake system 300 according to a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. In the third embodiment, unlike the first embodiment, a case will be described in which the intake device 300 is composed of a plurality (two) of pieces. In addition, about the same structure as the said 1st Embodiment, while attaching | subjecting the same code | symbol as the said 1st Embodiment, description is abbreviate | omitted.

<Configuration of Intake Device>
The intake device 300 includes a surge tank 210, an upstream intake passage 220 disposed on the upstream side of the surge tank 210, and three downstream intake passages 30 (31, 32 and 31) disposed on the downstream side of the surge tank 310. 33) and an air intake device main body 340 made of resin provided therein. In the intake device body 340, the surge tank 210 and the upstream intake passage 220 have the same configuration as the surge tank 210 and the upstream intake passage 220 in the intake device 200 of the second embodiment, and three The downstream side intake passage 30 has the same configuration as the downstream side intake passage 30 in the intake device 100 of the first embodiment. Further, a rectifying portion 311 that divides the partition portion 212 and has a wall portion 314 on the X1 direction side and a wall portion 315 on the X2 direction side is disposed in the partition portion 212 of the surge tank 210.

  Here, in the third embodiment, as shown in FIGS. 9 and 10, the resin intake device main body 340 is joined by vibration welding of the first piece 341 and the second piece 342 to each other. Yes. That is, the surge tank 210, the upstream side intake passage 220, and the downstream side intake passage 30 are formed by joining the first piece 341 and the second piece 342 together.

  The first piece 341 constitutes a portion on the Y2 direction side of the intake device main body 340, and includes flange portions 40a and 40b. Moreover, the flange part 341a is formed in the part joined to the 2nd piece 342 among the 1st pieces 341 over the perimeter.

  The second piece 342 constitutes a portion of the intake device main body 340 on the Y1 direction side. In addition, a flange portion 342a is formed over the entire circumference at a portion of the second piece 342 joined to the first piece 341 so as to correspond to the flange portion 341a. And the flange part 341a and the flange part 342a are joined by carrying out vibration welding mutually using the vibration welding apparatus which is not shown in figure in the state which the flange part 341a and the flange part 342a contact | abutted.

  A first rectification unit 316 that is a part of the rectification unit 311 is integrally formed with the first piece 341. The first rectifying unit 316 has a straightening portion 316a constituting the Y2 direction side of the wall portion 314 on the X1 direction side, and a straightening portion 316b constituting the Y2 direction side of the wall portion 315 on the X2 direction side. Both the rectifying portions 316a and 316b protrude toward the inside (Y1 direction side) of the surge tank 210.

  The second piece 342 is integrally formed with a second rectification unit 317 that is a part of the rectification unit 311. The second rectifying portion 317 has a straightening portion 317a constituting the Y1 direction side of the wall portion 314 on the X1 direction side, and a straightening portion 317b constituting the Y1 direction side of the wall portion 315 on the X2 direction side. Both the rectifying portions 317a and 317b protrude toward the inside (Y2 direction side) of the surge tank 210.

  Further, in the third embodiment, the inner end 316c of the rectifying portion 316a constituting the X1 direction side wall 314 and the inner end 317c of the rectifying portion 317a are disposed to face each other with a minute gap. As a result, the inner end 317c of the rectifying portion 317a is disposed opposite to the vicinity of the inner end 316c of the rectifying portion 316a. Similarly, the inner end 316 d of the rectifying portion 316 b constituting the X2 direction side wall 315 and the inner end 317 d of the rectifying portion 317 b are disposed to face each other with a minute gap therebetween. As a result, the inner end 317d of the rectifying portion 317b is disposed opposite to the vicinity of the inner end 316d of the rectifying portion 316b. Here, it is preferable that the minute gap is a gap that does not allow air passing through the inside of the compartment to move to another compartment. The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

(Effect of the third embodiment)
In the third embodiment, the following effects can be obtained.

  In the third embodiment, the air flow toward the downstream opening 32a on the center side in the X-axis direction and the downstream openings 31a and 33a on the direction side away from the center side in the X-axis direction are caused by the rectifying unit 311. The air introduced into the surge tank 210 is divided into the air flow. Thereby, the difference of the distribution amount of the air between the three downstream side intake passages 30 can be made small like the said 1st Embodiment.

  In the third embodiment, the surge tank 210 is formed by joining the first piece 341 and the second piece 342. Thereby, compared with the case where the whole surge tank is formed integrally, the surge tank 210 can be formed easily. Further, the inner end portions 317c and 317d of the second rectifying unit 317 are disposed to face each other in the vicinity of the inner end portions 316c and 316d of the first rectifying unit 316. Thus, the surge tank 210 can be sufficiently partitioned by the first rectifying portion 316 of the first piece 341 and the second rectifying portion 317 of the second piece 342 respectively provided on different members. As a result, even when the surge tank 210 is formed of a plurality of pieces (the first piece 341 and the second piece 342), the difference in the amount of air distribution among the plurality of downstream intake passages 30 can be ensured. Can be small. The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

[Modification]
It should be understood that the embodiment disclosed herein is illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the description of the above-described embodiment but by the scope of claims for patent, and further includes all modifications (variants) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the ratio of the straightening portion (wall portion) away from the center in the X-axis direction (first direction) from the upstream opening side toward the downstream opening side is gradually Although the example which curves so that it may become large was shown, this invention is not limited to this. In the present invention, the rectifying unit may be formed so as to be inclined in a direction away from the center of the first direction from the upstream opening side toward the downstream opening side, and is not formed to be curved. May be. For example, as in the first modification of the first embodiment shown in FIG. 11, the wall portions 414 and 415 of the rectifying unit 411 of the intake device main body 440 are both connected from the upstream opening 20a side to the downstream opening 31a, You may make it incline linearly so that it may leave | separate uniformly from the center O of a X-axis direction toward 32a and 33a side.

  Furthermore, in the present invention, the rectifying unit may not be inclined from the upstream opening side to the entire downstream opening side. For example, as in the second modified example of the first embodiment shown in FIG. 12, the wall portions 514 and 515 of the rectifying portion 511 of the intake device main body 540 are formed on the upstream side opening 20a side, and along the Z axis direction. The upstream side portions 514c and 515c and the downstream side opening portions 31a, 32a and 33a, and the center O in the X-axis direction from the upstream side opening portion 20a toward the downstream side opening portions 31a, 32a and 33a side. Further, it may be configured to have downstream side portions 514d and 515d that are linearly inclined so as to be evenly separated from each other.

  Moreover, in the said 1st-3rd embodiment, although the wall part was not provided in the communicating part of the surge tank, this invention is not limited to this. For example, as in the third modification of the first embodiment shown in FIG. 13, in the intake device main body 640, the downstream opening 31a of the surge tank 10 in the Z-axis direction from the vicinity of the upstream opening 20a of the surge tank 10. , 32a and 33a may be provided with a pair of wall portions 614 and 615 so as to extend. That is, in the third modified example, the wall portions 614 and 615 are provided not only in the partition portion 12 but also in the communication portion 613. In this case, the wall portions 614 and 615 in the partition portion 12 become the rectifying portion 611.

  The downstream end 614b on the Z1 direction side of the wall 614 is connected to the inner surface of the surge tank 10 on the X2 direction side of the downstream opening 31a. The downstream end 615b on the Z1 direction side of the wall 615 is connected to the inner surface of the surge tank 10 on the X1 direction side of the downstream opening 33a. And the through-holes 614e and 615e are provided in the wall parts 614 and 615 in the communication part 613, respectively. The through-holes 614e and 615e ensure communication at the communication portion 613.

  In the first embodiment, the intake system 100 of the present invention is applied to the in-line three-cylinder engine 1 having three cylinders 2, and in the second embodiment, the in-line four-cylinder engine 201 having four cylinders 202. Although the example which applied the intake device 200 of this invention was shown, this invention is not limited to this. For example, the intake device of the present invention may be applied to a V-type 6-cylinder engine. In this case, it is possible to apply the intake device 100 of the first embodiment to the V-shaped three-cylinder portion on one side and the three-cylinder portion on the other side, respectively.

  In the first embodiment, in the intake system 100 used for the in-line three-cylinder engine 1, both the flow passage cross-sectional area S1 of the first region R1 and the flow passage cross-sectional area S2 of the second region R2 are in the third region R3. Although the example which makes it larger than flow-path cross-sectional area S3 was shown, this invention is not limited to this. In the present invention, the flow passage cross-sectional area of the first region or the flow passage cross-sectional area of the second region may be changed to the third flow region if the difference in the air distribution among the plurality of downstream intake passages is suppressed. You may make it below the flow-path cross-sectional area of an area | region.

  In the second embodiment, in the intake system 200 used for the in-line four-cylinder engine 201, the flow passage cross-sectional area S11 of the first region R11 and the flow passage cross-sectional area S12 of the second region R12 are made larger than 1/4. Although the example in which the flow path cross-sectional area S13 of the third region R13 is less than ½ has been shown, the present invention is not limited to this. In the present invention, the flow passage cross-sectional area of the first region or the flow passage cross-sectional area of the second region is reduced to 1/1, provided that the increase in the difference in the air distribution among the plurality of downstream intake passages is suppressed. It may be 4 or less, and the channel cross-sectional area of the third region may be larger than 1/2.

  In the first embodiment, the wall 14 near the downstream end 14 b is the X axis direction of the downstream opening 31 a on the X1 direction side (the downstream opening on the side away from the center side in the first direction). It is located on the tangent L1 which goes to the X2 direction side slightly from the center of. Further, the wall 15 near the downstream end 15b is slightly more X1 than the X axis direction center of the downstream opening 33a in the X2 direction (the downstream opening in the direction away from the center side in the first direction). The example located on the tangent L2 which goes to a direction side was shown. In the second embodiment, the wall 214 in the vicinity of the downstream end 214b is located at the end on the X2 direction side of the downstream opening 231a (the downstream opening on the side away from the center in the first direction). It is located on the tangent L11 that goes. In addition, the wall portion 215 in the vicinity of the downstream end portion 215b is illustrated as being located at the tangent line L12 toward the end portion on the X1 direction side of the downstream opening portion 234a. However, the present invention is not limited to this. In the present invention, the wall portion in the vicinity of the downstream end portion may not be configured to be directed to the downstream opening side on the direction side away from the center side in the first direction. In addition, although it is preferable that the wall near the downstream end is configured to be further away from the center in the first direction than the downstream opening at the center in the first direction, the first region and the second When a large area is ensured, the wall near the downstream end may be configured to face the downstream opening on the center side in the first direction.

  In the first embodiment, the wall 14 near the downstream end 14 b is the X axis direction of the downstream opening 31 a on the X1 direction side (the downstream opening on the side away from the center side in the first direction). It is located on the tangent L1 which goes to the X2 direction side slightly from the center of. Further, the wall 15 near the downstream end 15b is slightly more X1 than the X axis direction center of the downstream opening 33a in the X2 direction (the downstream opening in the direction away from the center side in the first direction). The example located on the tangent L2 which goes to a direction side was shown. In the second embodiment, the wall 214 in the vicinity of the downstream end 214b is located at the end on the X2 direction side of the downstream opening 231a (the downstream opening on the side away from the center in the first direction). It is located on the tangent L11 that goes. In addition, the wall portion 215 in the vicinity of the downstream end portion 215b is illustrated as being located at the tangent line L12 toward the end portion on the X1 direction side of the downstream opening portion 234a. However, the present invention is not limited to this. In the present invention, the wall portion in the vicinity of the downstream end portion may not be configured to be directed to the downstream opening side on the direction side away from the center side in the first direction. In addition, although it is preferable that the wall near the downstream end is configured to be further away from the center in the first direction than the downstream opening at the center in the first direction, the first region and the second When a large area is ensured, the wall near the downstream end may be configured to face the downstream opening on the center side in the first direction.

  Moreover, in 3rd Embodiment, the inner side edge part 316c of the rectification | straightening part 316a of the 1st rectification | straightening part 316 and the inner side edge part 317c of the rectification | straightening part 317a of the 2nd rectification | straightening part 317 are arrange | positioned facing each other with a minute gap. Moreover, although the inner end 316d of the rectifying portion 316b of the first rectifying portion 316 and the inner end 317d of the rectifying portion 317b of the second rectifying portion 317 are arranged to face each other with a minute gap therebetween, The invention is not limited to this. In the present invention, the inner end portion of the first rectifying unit and the inner end portion of the second rectifying unit may be arranged to face each other.

  Moreover, in the third embodiment, an example in which the intake device main body 340 is configured by two pieces (the first piece 341 and the second piece 342) is shown, but the present invention is not limited to this. In the present invention, the intake device main body may be composed of three or more pieces.

1 Inline 3-cylinder engine (engine)
2, 202 Cylinder 10, 210 Surge tank 11, 211, 311, 411, 511, 611 Rectifier 12, 212 Partition part 13, 613 Communication part 20, 220 Upstream intake passage 20a, 220a Upstream opening 31, 32, 33, 231, 232, 233, 234 Downstream side intake passage 31a, 32a, 33a, 231a, 232a, 233a, 234a Downstream side opening 40c Inner surface (first inner surface)
40d inner surface (second inner surface)
100, 200, 300 intake system 201 in-line 4-cylinder engine (engine)
314 1st piece 315 2nd piece 316 1st rectification part 317 2nd rectification part R1, R11 1st field R2, R12 2nd field R3, R13 3rd field X 1st direction Y 2nd direction Z1 Distribution direction

Claims (6)

A surge tank,
An upstream intake passage including an upstream opening connected to the surge tank and introducing air into the surge tank via the upstream opening;
A plurality of downstream intake passages each including a downstream side opening connected to the surge tank, for introducing air from the surge tank to each of a plurality of cylinders of the engine;
The plurality of downstream openings of the plurality of downstream intake passages are arranged in a first direction in which the plurality of cylinders are arranged,
The upstream openings of the upstream intake passages are the plurality of downstream openings in a plan view from the air flow direction and the second direction orthogonal to the first direction in the plurality of downstream openings. Pointing between the downstream opening at the center in the first direction or between the pair of downstream openings at the center in the first direction,
In the surge tank,
It is formed so as to incline in the direction away from the center in the first direction from the vicinity of the upstream opening toward the plurality of downstream openings, and on the downstream opening on the center side in the first direction. A rectification unit that divides the air flow toward the air flow toward the downstream opening on the direction side away from the central side of the first direction is provided, and the surge tank is partitioned by the rectification unit Part,
A communication part formed so as to communicate with the downstream side of the partition part, and
The air intake device in which the rectifying unit is arranged in the partition portion so that the air flow from the upstream opening as viewed from the upstream side in the flow direction is divided into a plurality of regions.   2. The air intake system according to claim 1, wherein the straightening unit extends from the first inner surface on one side in the second direction to the second inner surface on the other side in the second direction in the surge tank.   3. The device according to claim 1, wherein the flow straightening unit is curved such that a rate of separation from the center in the first direction gradually increases from the upstream side opening toward the plurality of downstream side openings. Intake device as described. The number of the plurality of cylinders and the downstream side intake passage is three,
In the partition portion, the air flow from the upstream opening as viewed from the upstream side of the upstream opening is the flow to the first region and the second region on both sides of the first direction, and the first direction. The flow straightener is arranged to be divided into the flow to the central third region of the
The air intake according to any one of claims 1 to 3, wherein a flow path cross-sectional area of the first area and a flow path cross-sectional area of the second area are both larger than a flow path cross-sectional area of the third area. apparatus. The number of the plurality of cylinders and the downstream side intake passage is four,
In the partition portion, the air flow from the upstream opening as viewed from the upstream side of the upstream opening is the flow to the first region and the second region on both sides of the first direction, and the first direction. The flow straightener is arranged to be divided into the flow to the central third region of the
Both the channel cross-sectional area of the first region and the channel cross-sectional area of the second region are larger than 1/4 of the channel cross-sectional area of the upstream opening, and the channel cross-sectional area of the third region Is an intake device according to any one of claims 1 to 3, which is less than ½ of a flow path cross-sectional area of the upstream opening. The surge tank is formed by joining the first piece and the second piece,
The rectifying unit is provided in the first piece and protrudes toward the inside of the surge tank; the rectifying unit is provided in the second piece; and protrudes toward the inside of the surge tank; The intake device according to any one of claims 1 to 5, further comprising a second rectifying unit having an inner end disposed opposite to the inner end of the first rectifying unit.

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