JP2021055664A - Intake device - Google Patents

Abstract

To provide an intake device which can improve distribution performance for uniformly distributing an exhaust gas while preventing that a height of an engine becomes high.SOLUTION: This intake device 100 comprises an intake device main body 101, and a tournament-shaped gas distribution passage 102. The gas distribution passage 102 includes one or more upstream-side passage parts 4, two first branch passage parts 5 for branching an exhaust gas from the upstream-side passage part 4 into two exhaust gases, and four second branch passage parts 6 for branching the exhaust gas from each of the first branch passage parts 5 into two exhaust gases in an intake passage alignment direction. The intake device main body 101 includes a flange part 3 having an abutment face 31 and a plurality of fixed parts 32, the plurality of fixed parts 32 sandwich the two first branch passage parts 5 from both sides in the intake passage alignment direction when viewed from a direction orthogonal to the abutment face 31, and a center line β of an introduction port 7 of the exhaust gas is arranged inside a center line γ1 of the intake passage 2 in each of the four intake passages 2 in the intake passage alignment direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to an intake device.

Conventionally, an intake device including a distribution passage for distributing external gas to a plurality of cylinders is known (see, for example, Patent Document 1).

Patent Document 1 discloses an intake manifold (intake device) including four intake passages arranged in series and an exhaust gas recirculation device (gas distribution passage) for distributing exhaust gas to the four intake passages. There is. Further, the intake manifold includes a flange portion having a plurality of fixing portions for fixing the intake manifold to the cylinder head. The exhaust gas recirculation device supplies one, two, and exhaust gases in the order of the exhaust intake section (upstream passage section), the main distribution section (first branch passage section), and the intercylinder distribution section (second branch passage section). It is formed in a tournament shape that branches in four steps.

When viewed from the direction orthogonal to the contact surface of the flange portion with the cylinder head, the plurality of fixed portions sandwich the main distribution portion from both sides in the arrangement direction of the four intake passages. This prevents the height of the engine from increasing.

Of the four inlets of the exhaust gas recirculation device that introduces exhaust gas into the four intake passages, the two outer inlets are arranged outside or in the middle of the four intake passages in the arrangement direction of the four intake passages. , The two inner inlets are arranged inside the intake passages in the arrangement direction of the four intake passages. The introduction port is provided at the downstream end of the inter-cylinder distribution section.

JP-A-2018-165478

However, in the intake manifold (intake device) described in Patent Document 1, the outer two of the four introduction ports of the exhaust gas recirculation device (gas distribution passage) that introduce the exhaust gas into the four intake passages are introduced. The ports are arranged outside or in the middle of the intake passages in the arrangement direction of the four intake passages, and the two inner inlets are arranged inside the intake passages. Therefore, the length of the inter-cylinder distribution portion (second branch passage portion) in the arrangement direction of the four intake passages becomes relatively large, and the path length through which the exhaust gas passes becomes large, so that the exhaust gas is evenly distributed. There is a problem that the distribution performance is deteriorated.

The present invention has been made to solve the above problems, and one object of the present invention is the distribution performance of evenly distributing the external gas while preventing the height of the engine from increasing. Is to provide an intake device capable of improving.

In order to achieve the above object, the intake device in one aspect of the present invention is introduced with an intake device main body including four intake passages arranged in series and an external gas, and the introduced external gas is introduced by 1. It is formed in a tournament shape that branches into two and four steps, and has a gas distribution passage that distributes external gas to the four intake passages. The gas distribution passage is an array of intake passages in which four intake passages are lined up. In the direction, it is arranged between the inner two of the four intake passages, and is connected to one upstream passage portion into which an external gas is introduced and the upstream passage portion from the downstream side, from the upstream passage portion. Two first branch passages that branch the external gas into two, and four fourth passages that are connected to the first branch passage from the downstream side and further branch the external gas from each of the first branch passages into two. The intake device main body includes a two-branch passage portion, and is provided at the most downstream of the intake passage, and has a contact surface that abuts on the cylinder head and a plurality of fixing portions that fix the intake device main body to the cylinder head. The plurality of fixed portions are configured to sandwich the two first branch passage portions from both sides in the intake passage arranging direction when viewed from the direction orthogonal to the contact surface, further including the flange portion, and in the intake passage arranging direction, In each of the four intake passages, the center line of the introduction port to which the second branch passage portion is connected and the external gas is introduced is arranged inside the intake passage on the upstream side passage portion side. There is.

In the intake device according to one aspect of the present invention, as described above, in each of the four intake passages in the direction in which the intake passages are arranged, the second branch passage portion is connected to the center line of the introduction port into which the external gas is introduced. Is arranged inside, which is on the upstream side passage portion side of the center line of the intake passage. As a result, the length of the second branch passage portion in the direction in which the intake passages are arranged can be made relatively small. As a result, the path length through which the external gas passes can be reduced, so that the distribution performance for evenly distributing the external gas can be improved. Further, by arranging the two first branch passage portions at positions sandwiched by the plurality of fixed portions when viewed from a direction orthogonal to the contact surface in contact with the cylinder head, the two first branch passage portions can be arranged. It can be placed relatively close to the engine body. As a result, it is possible to prevent the height of the engine from increasing. As described above, the intake device can improve the distribution performance of evenly distributing the external gas while preventing the height of the engine from increasing.

In the intake device according to the above one aspect, preferably, in the intake passage arranging direction, the first length of the second branch passage portion arranged outside in the intake passage arranging direction is the first length and arranged inside. It is 0.4 times or more and 0.6 times or less the total with the second length in the intake passage arranging direction of the second branch passage portion.

As a result of diligent studies, the inventor of the present application has configured the gas distribution passage so that the first length is 0.4 times or more and 0.6 times or less the total of the first length and the second length. Then, it was found that the distribution performance of evenly distributing the external gas can be further improved by the gas distribution passage. This point has been confirmed by a simulation described later.

In the intake device according to the above one aspect, preferably, a plurality of fixing portions are arranged on the lower side of the flange portion, and a pair of first fixing portions sandwiching the gas distribution passage from both sides in the direction of arranging the intake passage and a flange. It is arranged on the upper side of the portion, is arranged inside the pair of first fixed portions in the intake passage arranging direction, and is a pair of second fixed portions sandwiching the first branch passage portion from both sides in the intake passage arranging direction. And one third fixed portion which is arranged on the lower side of the flange portion and is arranged substantially in the middle of the pair of the second fixed portions in the intake passage arranging direction, and the pair of the first fixed portions and the pair. The second fixed portion and one third fixed portion are arranged alternately on the lower side and the upper side of the flange portion from one side to the other side in the intake passage arranging direction in a zigzag manner, and four second branch passages. The portions are arranged between the pair of second fixing portions on the upper side of the flange portion and the pair of first fixing portions and one third fixing portion on the lower side of the flange portion in the vertical direction.

With this configuration, the height of the engine increases while the intake device main body is stably fixed by the plurality of fixing portions alternately arranged in a zigzag shape on the lower side and the upper side of the flange portion. Can be prevented.

In the intake device according to the above one aspect, preferably, in the direction orthogonal to the intake passage arranging direction when viewed from the direction orthogonal to the contact surface, the range in which the two first branch passage portions are provided is the intake passage arranging direction. It overlaps with the range in which a plurality of fixed portions sandwiching the two first branch passage portions are provided from both sides of the above.

With this configuration, the height of the two first branch passages can be reliably matched to the heights of the plurality of fixed portions that sandwich the two first branch passages, so that the height of the engine is large. It can be surely prevented from becoming.

In the intake device according to the above one aspect, preferably, the gas distribution passage is one communication passage portion that communicates with two second branch passage portions arranged inside on the upstream side passage portion side in the intake passage arrangement direction. Including further.

With this configuration, when the blowback of the intake air through the introduction port occurs, the blowback of the intake air can be dispersed to the plurality of second branch passage portions via the communication passage portion, so that the external gas can be blown back. The distribution performance can be further improved.

In the intake device according to the above one aspect, the external gas is preferably exhaust gas that is recirculated from the exhaust device to the intake device main body.

With this configuration, it is possible to improve the distribution performance of the exhaust gas recirculated from the exhaust device to the intake device main body.

In the intake device according to the above one aspect, preferably, the intake device main body and the gas distribution passage are divided by a predetermined dividing surface, and are joined to each other to form an intake passage and a second branch passage portion. At least one of the inlets arranged in each of the four intake passages includes an expansion portion formed by joining a plurality of resin members to each other, and an expansion portion and a second in the external gas flow direction. The reduced portion includes a second branch passage portion and a reduced portion having a flow path cross-sectional area smaller than the flow path cross-sectional area of the extended portion, and the reduced portion is a second branch passage among a plurality of resin members. It penetrates the resin member adjacent to the intake passage side of the portion.

With this configuration, instead of joining a plurality of resin members to each other to form a reduced portion, the reduced portion penetrates the resin member adjacent to the intake passage side of the second branch passage portion among the plurality of resin members. It is possible to avoid dimensional variation of the reduced portion due to the formation of the reduced portion by joining a plurality of resin members to each other. As a result, the flow rate of the external gas introduced from the introduction port to the intake passage can be stabilized as compared with the case where the introduction port is formed only by joining a plurality of resin members. Further, by providing a reduction portion having a flow path cross-sectional area smaller than the flow path cross-sectional area of the second branch passage portion, the flow rate of the external gas flowing out from the second branch passage portion is changed by changing the flow path cross-sectional area of the reduction portion. As a result, the flow rate of the external gas can be easily changed according to the size of the engine. Further, by providing a reduction portion having a flow path cross-sectional area smaller than the flow path cross-sectional area of the expansion portion, the flow path cross-sectional area of the expansion portion becomes larger than the reduction portion, so that the reduction portion can be smoothly external to the expansion portion. Gas can flow out.

In this case, preferably, in the external gas flow direction, the expansion portion communicates the reduction portion and the intake passage, and when viewed from the direction orthogonal to the contact surface, the reduction portion is the intake passage in the direction in which the intake passages are arranged. It is located on the outside.

With this configuration, unlike the case where the arrangement position of the reduced portion is restricted to the inside of the intake passage, the reduced portion is arranged outside the intake passage in the direction in which the intake passage is arranged, so that the second branch passage portion is provided. It is possible to secure a large route length. As a result, the limitation on the length of the second branch passage portion can be relaxed.

The following configuration is also conceivable in the intake device according to the above one aspect.

(Appendix 1)
In the intake device provided with the reduced portion and the expanded portion, the reduced portion is formed as a through hole penetrating the resin member adjacent to the intake passage side of the second branch passage portion among the plurality of resin members by molding. There is.

With this configuration, instead of joining a plurality of resin members to each other to form a reduced portion, the resin member adjacent to the intake passage side of the second branch passage portion among the plurality of resin members is formed by molding. By forming the reduced portion as a through hole, it is possible to avoid dimensional variation of the reduced portion due to the formation of the reduced portion by joining a plurality of resin members to each other. Further, when the intake device main body is formed by molding, a reduced portion can be formed together with the intake passage. As a result, the flow rate of the external gas introduced into the intake passage from the introduction port can be stabilized, and the reduced portion can be easily formed.

(Appendix 2)
In the intake device provided with the reduced portion and the expanded portion, the expanded portion extends from the inner surface of the intake passage toward the outside of the intake passage in the direction in which the intake passage is arranged, and the reduced portion extends in the extending direction of the expanded portion. It extends from the extension portion toward the second branch passage portion side in the direction orthogonal to the second branch passage portion.

With this configuration, when the expansion portion and the reduction portion are formed by molding the resin member, the expansion portion and the reduction portion are reduced from the expansion portion toward the second branch passage portion side in the direction orthogonal to the extension direction of the expansion portion. Since the portion is extended, the resin member having both the reduced portion and the expanded portion can be easily taken out from the mold. As a result, the reduced portion and the expanded portion can be formed together at the time of molding the resin member, so that the expanded portion and the expanded portion can be easily formed.

(Appendix 3)
In the intake device provided with the reduced portion and the expanded portion, the bottom surface of the expanded portion on the opposite side of the reduced portion is located on the opposite side of the second branch passage portion in the direction of arranging the intake passages toward the intake passage side. It is tilted.

With this configuration, the condensed water in which the water contained in the external gas is condensed can be easily discharged to the intake passage along the bottom surface of the expansion portion, so that the clogging of the introduction port due to the condensed water can be suppressed. be able to.

It is a schematic diagram which showed the in-line 4-cylinder engine provided with the intake device by 1st Embodiment. It is an arrow view along the line 500-500 of FIG. 1, and is the figure which showed the gas distribution passage of the intake device and the flange part from the direction orthogonal to the contact surface of the flange part. It is an enlarged view which showed the gas distribution passage of FIG. It is sectional drawing which follows the line 510-510 of FIG. It is a figure which showed the gas distribution passage and the flange part of the intake device by 2nd Embodiment from the direction orthogonal to the contact surface of the flange part. It is a side view which showed the intake device by 3rd Embodiment. It is sectional drawing along the line 600-600 of FIG. It is an arrow view of the line 610-610 of FIG. It is a partially enlarged view which showed the Z part of FIG. It is a figure which showed the simulation result about the relationship between the branching fraction of an Example, and the variation of an exhaust gas distribution.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The configuration of the intake device 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the present embodiment, the intake device 100 is provided with an in-line 4-cylinder engine E (an engine in which four cylinders E11 are arranged in series in a predetermined direction). Note that, in FIG. 1, since the in-line 4-cylinder engine E is shown when viewed from a predetermined direction (direction A described later), only one cylinder E11 is shown.

(Structure of an in-line 4-cylinder engine equipped with an intake device)
The in-line 4-cylinder engine E shown in FIG. 1 is mounted horizontally on the front of an automobile vehicle. In the in-line 4-cylinder engine E, the intake device 100 is arranged on the front side. A bonnet BN is arranged above the intake device 100. A gap of a predetermined distance D0 or more is secured between the intake device 100 and the bonnet BN. The predetermined distance D0 is the minimum distance required to protect a pedestrian who has collided with the bonnet BN.

The in-line 4-cylinder engine E includes an intake device 100, an engine body E1 including a cylinder head E10 to which intake air is supplied from the intake device 100, an exhaust device E2 to discharge exhaust gas from the cylinder head E10, and an exhaust gas return path E3. And have.

The intake device 100 is connected to the cylinder head E10 from the upstream side in the intake flow direction. Further, the exhaust device E2 is connected to the cylinder head E10 from the downstream side in the exhaust flow direction.

The exhaust gas return path E3 has an upstream end connected to an exhaust device E2 and a downstream end connected to an intake device 100 (a gas distribution passage 102 described later in the intake device 100). The exhaust gas return path E3 is configured to return exhaust gas (an example of "external gas" within the scope of claims) from the exhaust device E2 to the intake device 100 (the intake device main body 101 of the intake device 100). That is, the exhaust gas is EGR gas.

The intake device 100 is fixed to the cylinder head E10 by a plurality of bolts b attached to the flange portion 3 of the intake device 100. The plurality of bolts b are simultaneously attached to the flange portion 3 by a dedicated bolt attachment device (not shown).

(Structure of intake device)
The intake device 100 includes an intake device main body 101 and a gas distribution passage 102.

The gas distribution passage 102 is attached to the intake device main body 101 from above. Therefore, the gas distribution passage 102 is arranged at the position closest to the bonnet BN in the intake device 100.

As shown in FIG. 2, the gas distribution passage 102 includes one upstream passage portion 4, two first branch passage portions 5, and four, which are arranged in order from the upstream side in the flow direction of the returned exhaust gas. The second branch passage portion 6 is included. The gas distribution passage 102 is formed in a tournament shape by one upstream side passage portion 4, two first branch passage portions 5, and four second branch passage portions 6. Details will be described later.

The gas distribution passage 102 is formed so as to be plane symmetric (line symmetric) with respect to the central surface (center line α) of the gas distribution passage 102 extending in a direction orthogonal to the intake passage arrangement direction (A direction) described later. There is. The center line α is the center line of the gas distribution passage 102 when the gas distribution passage 102 is viewed from a direction (direction B) orthogonal to the contact surface 31 described later.

(Structure of the intake device body of the intake device)
The intake device main body 101 includes a surge tank 1, four intake passages 2 arranged in series, and a flange portion 3 having a contact surface 31 that abuts on the cylinder head E10. The contact surface 31 is provided on the most downstream side of the intake passage 2 (downstream end portion 22 shown in FIG. 1).

Hereinafter, the direction in which the four intake passages 2 arranged in series are arranged will be described as the “intake passage arrangement direction”. Further, in each figure, the "intake passage arranging direction" is shown in the A direction. The intake passage arranging direction (A direction) is also the direction in which the four cylinders E11 of the in-line 4-cylinder engine E are arranged.

Further, the direction orthogonal to the contact surface 31 is indicated by the B direction, the direction of the B direction from the cylinder head E10 side to the flange portion 3 side is indicated by the B1 direction, and the opposite direction is indicated by the B2 direction.

Further, when viewed from the direction orthogonal to the contact surface 31 (B direction), the direction orthogonal to the A direction is indicated by the C direction, the upward direction of the C direction is indicated by the C1 direction, and the opposite direction is indicated by the C2 direction. Shown by direction.

Further, in FIG. 1, the vertical direction is shown by the Z direction, the upper side is shown by the Z1 direction, and the lower side is shown by the Z2 direction.

<Surge tank configuration>
The surge tank 1 shown in FIG. 1 is configured so that intake air is first supplied in the intake device main body 101. The surge tank 1 has a function of leveling the flow rate of the intake air flowing through the four intake passages 2 by temporarily storing the intake air.

<Composition of four intake passages>
The intake passage 2 is generally arranged above the surge tank 1. The intake passage 2 is curved so as to surround the surge tank 1 when viewed from the direction in which the intake passages are arranged. Specifically, the intake passage 2 extends upward, generally curved, from the upstream end 21 connected to the surge tank 1 toward the downstream side. Further, the intake passage 2 is generally curved on the downstream side so that the intake air flows in the downward oblique direction (the direction slightly inclined with respect to the horizontal direction) in the downstream side portion including the downstream end portion 22. Extends to. Each of the four intake passages 2 extends linearly in the C direction when viewed from the direction orthogonal to the contact surface 31 (B direction) (see FIG. 2, only the upper portion in FIG. 2). Is illustrated). Specifically, the four intake passages 2 extend in the C2 direction so that the upstream end portion 21 is separated from the flange portion 3 when viewed from the direction orthogonal to the contact surface 31 (B direction). ..

As shown in FIG. 2, the four intake passages 2 are arranged at equal intervals in the intake passage arrangement direction (A direction).

<Structure of flange>
The flange portion 3 includes a contact surface 31 and a plurality of fixing portions 32.

Similar to the gas distribution passage 102, the flange portion 3 (plurality of fixed portions 32) is axisymmetric with respect to the center surface (center line α) of the flange portion 3 extending in a direction orthogonal to the intake passage arrangement direction (A direction). It is formed so as to be (line symmetric). The central surface (center line α) of the flange portion 3 coincides with the central surface (center line α) of the gas distribution passage 102.

The contact surface 31 is a flat surface that contacts the cylinder head E10. The contact surface 31 has an elongated shape extending along the direction in which the intake passages are arranged. The downstream end 22 of the four intake passages 2 is connected to the contact surface 31 from the upstream side. That is, the contact surface 31 is located on the same plane as the downstream end 22 of the four intake passages 2.

The outer edge of the contact surface 31 surrounds (omitted) the entire gas distribution passage 102 when viewed from the direction orthogonal to the contact surface 31 (direction B).

The plurality of fixing portions 32 are configured to fix the intake device main body 101 to the cylinder head E10. Specifically, each of the plurality of fixing portions 32 is composed of fastening holes (through holes) for passing bolts b (see FIG. 1). The plurality of fixing portions 32 (fastening holes) extend in the direction orthogonal to the contact surface 31 (B direction) and penetrate the flange portion 3. The plurality of fixing portions 32 (fastening holes) extend in the thickness direction of the flange portion 3.

The plurality of fixing portions 32 are arranged at positions that do not overlap with the gas distribution passage 102 when viewed from a direction (direction B) orthogonal to the contact surface 31. That is, the plurality of fixing portions 32 are arranged at positions deviated from the gas distribution passage 102 (deviated position) when viewed from the direction orthogonal to the contact surface 31 (B direction). Therefore, a dedicated bolt mounting device (not shown) accesses the plurality of fixing portions 32 (flange portions 3) from the B1 direction side of the gas distribution passage 102 without interfering with the gas distribution passage 102, and a plurality of fixed portions 32 (flange portions 3) are accessed. The bolt b can be attached to the flange portion 3 at the same time.

When viewed from the direction orthogonal to the contact surface 31 (B direction), the plurality of fixed portions 32 (a pair of second fixed portions 32b described later) are two first branches from both sides in the intake passage arranging direction (A direction). It is configured to sandwich the passage portion 5.

The plurality of fixing portions 32 include a pair of first fixing portions 32a, a pair of second fixing portions 32b, and one third fixing portion 32c. That is, a total of five fixing portions 32 are provided on the flange portion 3.

The pair of first fixing portions 32a are arranged on the lower side (C2 direction side) of the flange portion 3. Further, the pair of first fixing portions 32a are arranged one by one in the vicinity of both ends of the flange portion 3 in the direction of arranging the intake passages. The pair of first fixing portions 32a sandwich the gas distribution passage 102 from both sides in the direction in which the intake passages are arranged.

The pair of first fixed portions 32a sandwich four intake passages 2 from both sides in the direction in which the intake passages are arranged. The pair of first fixed portions 32a are arranged on the C2 direction side with respect to the gas distribution passage 102 (four second branch passage portions 6).

The pair of second fixing portions 32b are arranged on the upper side (C1 direction side) of the flange portion 3. The pair of second fixing portions 32b are arranged inside the pair of first fixing portions 32a in the intake passage arranging direction. The pair of second fixed portions 32b sandwich the first branch passage portion 5 from both sides in the direction in which the intake passages are arranged. The pair of second fixed portions 32b are arranged one by one in the vicinity of the outer ends of the two first branch passage portions 5 in the intake passage arranging direction. The pair of second fixing portions 32b are arranged between the inner introduction port 7 (the opening for introducing the exhaust gas into the intake passage 2) and the outer introduction port 7 in the direction in which the intake passages are arranged.

The pair of second fixed portions 32b are arranged at two locations between the two outer intake passages 2 and the two inner intake passages 2 in the direction in which the intake passages are arranged. The pair of second fixing portions 32b are arranged on the C1 direction side with respect to the four second branch passage portions 6. The pair of second fixing portions 32b are arranged in the vicinity of the C1 direction ends of the four intake passages 2 in the C direction when viewed from the direction orthogonal to the contact surface 31 (B direction).

One third fixing portion 32c is arranged on the lower side (C2 direction side) of the flange portion 3. Further, one third fixed portion 32c is arranged substantially in the middle of the pair of second fixed portions 32b in the intake passage arranging direction. One third fixed portion 32c is arranged substantially in the middle of the pair of first fixed portions 32a in the intake passage arranging direction. One third fixed portion 32c is arranged on the central surface (center line α) of the flange portion 3 extending in a direction orthogonal to the intake passage arranging direction (A direction).

One third fixed portion 32c is arranged between two intake passages 2 inside the four intake passages 2 in the direction in which the intake passages are arranged. One third fixed portion 32c is arranged on the C2 direction side with respect to the gas distribution passage 102 (four second branch passage portions 6).

The plurality (five) fixing portions 32 are formed by a pair of first fixing portions 32a, a pair of second fixing portions 32b, and one third fixing portion 32c from one side to the other side in the intake passage arranging direction (A direction). The flange portions 3 are alternately arranged in a zigzag shape on the lower side and the upper side toward the side.

(Structure of gas distribution passage of intake device)
As shown in FIG. 2, the gas distribution passage 102 is formed in a tournament shape in which the introduced external gas is introduced and the introduced external gas is gradually branched into one, two, and four, and four intakes are taken. It is configured to distribute the external gas to the passage 2.

Further, as described above, the gas distribution passage 102 includes one upstream side passage portion 4, two first branch passage portions 5, and four second branch passage portions 6.

A flange portion 4a for connecting the exhaust gas return path E3 from the upstream side is provided at the upstream end portion of one upstream passage portion 4.

One upstream passage portion 4 is arranged between the inner two of the four intake passages 2 in the intake passage arrangement direction (A direction). One upstream passage portion 4 is a portion of the gas distribution passage 102 where the exhaust gas is first introduced.

One upstream passage portion 4 is arranged on the center line α of the gas distribution passage 102 (flange portion 3). One upstream passage portion 4 is arranged on the C1 direction side with respect to one third fixed portion 32c.

One upstream passage 4 generally extends in the B direction. One upstream passage portion 4 is configured to allow exhaust gas to flow toward the B2 direction side, which is the downstream side.

The two first branch passage portions 5 are connected to the upstream side passage portion 4 from the downstream side. The two first branch passage portions 5 are configured to branch the external gas from the upstream side passage portion 4 into two.

The two first branch passage portions 5 are generally formed in an L shape when viewed from a direction (direction B) orthogonal to the contact surface 31. Specifically, the two first branch passage portions 5 are along the intake passage 2 from the upstream linear portion extending linearly in the intake passage alignment direction (A direction) and the outer end portion of the upstream linear portion. It is generally formed in an L shape by the downstream linear portion extending in the direction toward the upstream side (see FIG. 1) of the intake passage 2.

The four second branch passage portions 6 are connected to the first branch passage portion 5 from the downstream side. The four second branch passage portions 6 are configured to further branch the external gas from each of the first branch passage portions 5.

Each of the four second branch passages 6 generally extends linearly in the A direction. The four second branch passage portions 6 overlap each other when viewed from the intake line-up direction (A direction) (see FIG. 1). In the intake passage arranging direction (A direction), the two inner second branch passage portions 6 are configured to allow exhaust gas to flow to the inner side on the downstream side. In the intake passage arranging direction (A direction), the two outer second branch passage portions 6 are configured to allow exhaust gas to flow to the outer side on the downstream side.

In each of the four intake passages 2 in the direction in which the intake passages are arranged, the center line β of the introduction port 7 in which the second branch passage portion 6 is connected from the upstream side and the exhaust gas is introduced into the intake passage 2 is the intake passage 2. It is arranged inside the passage portion 4 on the upstream side of the center line γ1 of the above. The introduction port 7 is an opening provided at the downstream end of the second branch passage portion 6.

Further, in the intake passage arranging direction, in each of the four intake passages 2, the center line β of the introduction port 7 is the center indicating the center of the center line γ1 of the intake passage 2 and the innermost end 2a of the intake passage 2. It is arranged inside the line γ2.

Further, in each of the four intake passages 2 in the direction in which the intake passages are arranged, the center line β of the introduction port 7 is arranged in the vicinity of the innermost end portion 2a of the intake passage 2.

As shown in FIG. 3, in the intake passage arranging direction, the first length La in the intake passage arranging direction of the second branch passage portion 6 arranged on the outside is the first length La and the first length La arranged on the inside. It is 0.4 times or more and 0.6 times or less the total with the second length Lb in the intake passage arranging direction of the two-branch passage portion 6. As an example, in the direction in which the intake passages are arranged, the first length La is about 0.5 times the total of the first length La and the second length Lb.

The four second branch passage portions 6 have a pair of second fixing portions 32b on the upper side of the flange portion 3 and a pair of first fixing portions on the lower side of the flange portion 3 in the vertical direction (Z direction) (C direction). It is arranged between the portion 32a (see FIG. 2) and one third fixing portion 32c.

In the direction orthogonal to the intake passage arranging direction (C direction) when viewed from the direction orthogonal to the contact surface 31 (B direction), the range R1 in which the two first branch passage portions 5 are provided is the intake passage arranging direction. It overlaps with the range R2 in which a plurality of fixing portions 32 (a pair of second fixing portions 32b) sandwiching the two first branch passage portions 5 from both sides are provided.

[Effect of the first embodiment]
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, in each of the four intake passages 2 in the direction in which the intake passages are arranged, the second branch passage portion 6 is connected to the introduction port 7 into which the external gas (exhaust gas) is introduced. The center line β is arranged inside the intake passage 2 on the upstream side passage portion 4 side of the center line γ1. As a result, the length of the second branch passage portion 6 in the direction in which the intake passages are arranged can be made relatively small. As a result, the path length through which the external gas passes can be reduced, so that the distribution performance for evenly distributing the external gas can be improved. Further, by arranging the two first branch passage portions 5 at positions sandwiched by the plurality of fixed portions 32 when viewed from a direction orthogonal to the contact surface 31 that abuts on the cylinder head E10, the two first branch passage portions 5 are arranged. The passage portion 5 can be arranged at a position relatively close to the engine main body E1. As a result, it is possible to prevent the height of the in-line 4-cylinder engine E from increasing. As described above, the intake device 100 can improve the distribution performance of evenly distributing the external gas while preventing the height of the in-line 4-cylinder engine E from increasing.

In the first embodiment, as described above, in the intake passage arranging direction, the first length La of the second branch passage portion 6 arranged on the outside in the intake passage arranging direction is the first length La and the inside. It is 0.4 times or more and 0.6 times or less the total of the arranged second branch passage portion 6 and the second length Lb in the direction in which the intake passages are arranged. As a result of diligent studies, the inventor of the present application has made the first length La 0.4 times or more and 0.6 times or less the total of the first length La and the second length Lb. It has been found that by configuring the gas distribution passage 102, the distribution performance of evenly distributing the external gas (exhaust gas) can be further improved by the gas distribution passage 102. This point has been confirmed by a simulation described later.

In the first embodiment, as described above, the plurality of fixing portions 32 are arranged on the lower side of the flange portion 3, and the pair of first fixing portions 32a sandwiching the gas distribution passage 102 from both sides in the intake passage arranging direction. And, it is arranged on the upper side of the flange portion 3, is arranged inside the pair of first fixed portions 32a in the intake passage arranging direction, and sandwiches the first branch passage portion 5 from both sides in the intake passage arranging direction. A pair of second fixing portions 32b and one third fixing portion 32c arranged on the lower side of the flange portion 3 and arranged substantially in the middle of the pair of second fixing portions 32b in the intake passage arranging direction are included. , A pair of first fixing portions 32a, a pair of second fixing portions 32b, and one third fixing portion 32c, from one side to the other side in the intake passage arranging direction, to the lower side and the upper side of the flange portion 3. The four second branch passage portions 6 are arranged alternately in a zigzag shape, and the four second branch passage portions 6 are a pair of second fixing portions 32b on the upper side of the flange portion 3 and a pair of first fixing portions on the lower side of the flange portion 3 in the vertical direction. It is arranged between the portion 32a and one third fixed portion 32c. As a result, the height of the in-line 4-cylinder engine E is increased while the intake device main body 101 is stably fixed by the plurality of fixing portions 32 alternately arranged in a zigzag shape on the lower side and the upper side of the flange portion 3. It can be prevented from becoming.

In the first embodiment, as described above, the range R1 in which the two first branch passage portions 5 are provided in the direction orthogonal to the intake passage arrangement direction when viewed from the direction orthogonal to the contact surface 31 is the intake passage. It overlaps with the range R2 in which a plurality of fixing portions 32 sandwiching the two first branch passage portions 5 are provided from both sides in the arrangement direction. As a result, the heights of the two first branch passage portions 5 can be reliably matched to the heights of the plurality of fixed portions 32 that sandwich the two first branch passage portions 5, so that the height of the in-line 4-cylinder engine E can be adjusted. It is possible to surely prevent the height from becoming large.

In the first embodiment, as described above, the external gas is the exhaust gas that is recirculated from the exhaust device E2 to the intake device main body 101.

As a result, the distribution performance of the exhaust gas recirculated from the exhaust device E2 to the intake device main body 101 can be improved.

[Second Embodiment]
Next, the configuration of the intake device 200 according to the second embodiment of the present invention will be described with reference to FIG. In the second embodiment, in addition to the configuration of the first embodiment, an example in which the intake device 200 includes the communication passage portion 208 will be described. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The intake device 200 includes a gas distribution passage 202.

The gas distribution passage 202 includes one upstream side passage portion 4, two first branch passage portions 5, four second branch passage portions 6, and one communication passage portion 208.

The communication passage portion 208 communicates with the two second branch passage portions 6 arranged inside on the upstream side passage portion 4 side in the intake passage arrangement direction (A direction). The communication passage portion 208 communicates with each other at the inner ends of the two second branch passage portions 6 in the intake passage arrangement direction (A direction). The communication passage portion 208 is configured so that when the intake air flows into the intake passage 2 and the intake air flows into the inside of the gas distribution passage 202 through the introduction port 7 (backflow), the inflowed intake air flows. As a result, the communication passage portion 208 is configured to be able to more evenly disperse the backflow intake air to the plurality of other intake passages 2.

[Effect of the second embodiment]
In the second embodiment, the following effects can be obtained.

In the second embodiment, as in the first embodiment, the intake device 200 has a distribution performance of evenly distributing the external gas (exhaust gas) while preventing the height of the in-line 4-cylinder engine E from increasing. Can be improved.

In the second embodiment, as described above, the gas distribution passage 102 communicates with the two second branch passage portions 6 arranged inside on the upstream side passage portion 4 side in the intake passage arrangement direction. The passage portion 208 is further included. As a result, when the blowback of the intake air through the introduction port 7 occurs, the blowback of the intake air can be dispersed to the plurality of second branch passage portions 6 via the communication passage portion 208, so that the external gas (exhaust) can be dispersed. The distribution performance of gas) can be further improved.

Other effects of the second embodiment are the same as those of the first embodiment.

[Third Embodiment]
Next, the configuration of the intake device 300 according to the third embodiment of the present invention will be described with reference to FIGS. 6 to 9. In the third embodiment, unlike the configuration of the first embodiment, an example of the intake device 300 including the introduction port 307 arranged at a position deviated from the intake passage 2 will be described. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 6, the intake device 300 includes an intake device main body 301, a gas distribution passage 302, and an introduction port 307.

The intake device main body 301 and the gas distribution passage 302 include a plurality of resin members 320 that are divided by a predetermined division surface 310 and are joined to each other to form an intake passage 2 and a second branch passage portion 6.

Here, the intake device main body 301 and the gas distribution passage 302 are divided by three predetermined dividing surfaces 310. The predetermined dividing surface 310 indicates a lower dividing surface 311 provided on the surge tank 1 side in the Z direction. The predetermined dividing surface 310 indicates an upper dividing surface 312 provided on the gas distribution passage 302 side in the Z direction. The predetermined dividing surface 310 indicates an intermediate dividing surface 313 provided between the upper dividing surface 312 and the lower dividing surface 311 in the Z direction.

Further, the plurality of resin members 320 have a lower resin member 321, an EGR resin member 322, an upper resin member 323, and an intermediate resin member 324. The lower resin member 321 is a portion of the intake device main body 301 on the Z2 direction side divided by the lower dividing surface 311.

The EGR resin member 322 is a portion of the gas distribution passage 302 on the Z1 direction side divided by the upper division surface 312.

The upper resin member 323 is a portion of the gas distribution passage 302 on the Z2 direction side divided by the upper division surface 312, and is a portion of the intake device main body 301 on the Z1 direction side divided by the intermediate side division surface 313. ..

The intermediate resin member 324 is a portion of the intake device main body 301 on the Z1 direction side divided by the lower dividing surface 311 and a portion of the intake device main body 301 on the Z2 direction divided by the intermediate dividing surface 313. Is.

As shown in FIG. 7, the plurality of resin members 320 are provided with welding portions 320a for joining the plurality of resin members 320 to each other by vibration welding. Specifically, the lower resin member 321 and the intermediate resin member 324 are joined at a plurality of welded portions (not shown) by vibration welding. The intermediate side resin member 324 and the upper side resin member 323 are joined at a plurality of (five places) welding portions 320a by vibration welding. The upper resin member 323 and the EGR resin member 322 are joined at a plurality of (three places) welded portions 320a by vibration welding.

(Multiple inlets)
In the third embodiment, as shown in FIGS. 7 and 8, two of the inlets 307 that introduce EGR gas (an example of "external gas" in the claims) into each of the four intake passages 2. (At least one) is arranged at a position offset from the intake passage 2. That is, two of the introduction ports 307 that introduce the EGR gas into each of the four intake passages 2 are arranged outside the intake passage 2 when viewed from the direction orthogonal to the contact surface 31 (B direction). There is. Here, two of the introduction ports 307 for introducing EGR gas into each of the four intake passages 2 are a pair of inner introductions arranged on the upstream side passage portion 4 side in the intake passage arrangement direction (A direction). Mouth 307a (see FIG. 8). Further, the two introduction ports 307 other than the inner introduction port 307 are a pair of outer introduction ports 307b (see FIG. 8).

Specifically, as shown in FIGS. 8 and 9, the pair of inner inlets 307a have an expansion portion 371 and a reduction portion 372. Such an introduction port 307 is formed in an L shape by the expansion portion 371 and the reduction portion 372 in the cross section in the direction in which the second branch passage portion 6 extends. The pair of inner inlets 307a are not provided as a part of the intake passage 2, but are provided for introducing EGR gas into the intake passage 2 from a position deviated from the intake passage 2. Further, the pair of outer introduction ports 307b are formed to have substantially the same diameter as the respective reduction portions 372 of the pair of inner introduction ports 307a. In the following description, since the shapes of the pair of inner inlets 307a are the same, only one of the pair of inner inlets 307a will be described.

In the following description, the direction in which the expansion portion 371 and the reduction portion 372 are lined up is the D direction, the reduction portion 372 side in the D direction is the D1 direction, and the expansion portion 371 side in the D direction is the D2 direction.

<Expansion part>
As shown in FIGS. 8 and 9, the expansion portion 371 extends from the inner surface 302b of the intake passage 2 toward the outside of the intake passage 2 in the A direction. That is, the expansion portion 371 has a substantially rectangular shape (see FIG. 6) extending in the intake flow direction when viewed from either one of the A directions. In the external gas flow direction (hereinafter referred to as the F direction), the expansion unit 371 communicates the reduction unit 372 with the intake passage 2. When viewed from the B direction, the expansion portion 371 is arranged outside the intake passage 2 in the A direction. The expansion portion 371 is arranged in the range in which the intake passage 2 is formed in the D direction.

The expansion portion 371 has a flow path cross-sectional area T1 larger than the flow path cross-sectional area T2 of the reduction portion 372. Specifically, the minimum flow path cross-sectional area of the expansion section 371 is larger than the maximum flow path cross-sectional area of the reduction section 372. In this way, the expansion unit 371 expands the flow path cross-sectional area T2 of the reduction unit 372 so that the EGR gas easily flows out from the reduction unit 372. Further, the flow path cross-sectional area T1 of the expansion portion 371 becomes larger toward the downstream in the F direction.

The expansion unit 371 has a shape that allows the condensed water generated by the condensation of the water contained in the EGR gas to flow out to the intake passage 2. That is, the bottom surface 371a of the expansion portion 371 on the opposite side of the reduction portion 372 is inclined to the opposite side of the second branch passage portion 6 in the A direction toward the intake passage 2 side. Further, the top surface of the expansion portion 371 on the reduction portion 372 side extends along the A direction.

Such an expansion portion 371 is formed by joining a plurality of resin members 320 to each other. Specifically, the expansion portion 371 is formed by joining the intermediate side resin member 324 and the upper side resin member 323 by vibration welding. The portion of the expansion portion 371 on the Z1 direction side is formed in the upper resin member 323 as an opening opened on the Z2 direction side. The portion of the expansion portion 371 on the Z2 direction side is formed in the intermediate side resin member 324 as an opening opened on the Z1 direction side.

<Reduced part>
The reduction portion 372 penetrates the resin member 320 adjacent to the intake passage 2 side of the second branch passage portion 6 among the plurality of resin members 320. That is, the reduced portion 372 is located on the upper side in the direction extending toward the upper resin member 323 (D direction) in the direction orthogonal to the extending direction (A direction) of the expanding portion 371 when viewed from either one of the A directions. It is a through hole (see FIG. 6) that penetrates the resin member 323. The reduction section 372 communicates the expansion section 371 with the second branch passage section 6 in the F direction. When viewed from the B direction, the reduced portion 372 is arranged outside the intake passage 2 in the A direction. The reduction portion 372 is arranged in the range in which the intake passage 2 is formed in the D direction.

The reduction portion 372 has a flow path cross-sectional area T1 smaller than the flow path cross-sectional area T2 of the second branch passage portion 6 and the expansion portion 371. That is, the reduction portion 372 has a function as an orifice that narrows the flow path cross-sectional area of the second branch passage portion 6.

The reduction unit 372 has a shape that allows condensed water to flow out to the expansion unit 371. That is, when viewed from the A direction, the bottom surface 372a (see FIG. 6) on the Z2 direction side is inclined toward the Z2 direction side toward the engine body E1 side in the vehicle traveling direction. Further, the top surface 372b of the reduced portion 372 on the Z1 direction side is also inclined in the same manner as the bottom surface 372a on the Z2 direction side when viewed from the A direction.

Such a reduced portion 372 is formed as a through hole penetrating the resin member 320 adjacent to the intake passage 2 side of the second branch passage portion 6 among the plurality of resin members 320 by mold molding. That is, the reduced portion 372 is formed as a through hole penetrating the upper resin member 323 by mold molding. The reduction portion 372 extends from the expansion portion 371 toward the second branch passage portion 6 side in the direction orthogonal to the extension direction of the expansion portion 371 (see FIG. 6). The reduced portion 372 has a shape that makes it easy to take out the resin molded product from the mold when it is molded by mold molding. Specifically, the reduced portion 372 has a tapered shape in which the cross-sectional area T1 of the flow path is narrowed toward the D2 direction in the cross section along the A direction. The opening at the end of the reduction portion 372 in the D2 direction is the minimum aperture. That is, the flow path cross-sectional area T2 of the reduced portion 372 becomes smaller toward the downstream in the F direction. The other configurations of the third embodiment are the same as the configurations of the first embodiment.

[Effect of Third Embodiment]
In the third embodiment, the following effects can be obtained.

In the third embodiment, as in the first embodiment, the intake device 300 has a distribution performance of evenly distributing the EGR gas (exhaust gas) while preventing the height of the in-line 4-cylinder engine E from increasing. Can be improved.

In the third embodiment, as described above, the expansion portion 371 and the reduction portion 372 are provided in two of the introduction ports 307 arranged in each of the four intake passages 2. The reduced portion 372 is passed through the intermediate resin member 324. As a result, instead of joining the plurality of resin members 320 to each other to form the reduced portion 372, the plurality of resin members 320 are joined to each other by providing the intermediate side resin member 324 with the reduced portion 372 penetrating the reduced portion 372. It is possible to avoid dimensional variation of the reduced portion 372 due to the formation of the reduced portion 372. As a result, the flow rate of the EGR gas introduced from the introduction port 307 into the intake passage 2 can be stabilized as compared with the case where the introduction port 307 is formed only by joining the plurality of resin members 320. Further, by providing the reduction portion 372 having the flow path cross-sectional area T1 smaller than the flow path cross-sectional area of the second branch passage portion 6, the flow rate of the EGR gas flowing out from the second branch passage portion 6 is reduced to the flow of the reduction portion 372. Since it can be easily adjusted by changing the road cross-sectional area T1, the flow rate of the EGR gas can be easily changed according to the size of the engine E. Further, by providing the reduction portion 372 having the flow path cross-sectional area T1 smaller than the flow path cross-sectional area T2 of the expansion portion 371, the flow path cross-sectional area T2 of the expansion portion 371 becomes larger than the reduction portion 372. The EGR gas can be smoothly discharged from the 372 to the expansion portion 371.

In the third embodiment, as described above, in the F direction, the expansion unit 371 communicates the reduction unit 372 with the intake passage 2. When viewed from the B direction, the reduced portion 372 is arranged outside the intake passage 2 in the A direction. As a result, unlike the case where the arrangement position of the reduction portion 372 is restricted to the inside of the intake passage 2, the reduction portion 372 is arranged outside the intake passage 2 in the A direction, whereby the second branch passage portion 6 is arranged. A large route length can be secured. As a result, the limitation on the length of the second branch passage portion 6 can be relaxed.

Other effects of the third embodiment are the same as those of the first embodiment.

[Example]
Next, a simulation performed to confirm the effect of the present invention will be described with reference to FIGS. 3 and 10. In the simulation, the branching ratio (= La / (La + Lb)) was changed by changing the ratio of the first length La of the second branch passage portion 6 to the second length Lb of the second branch passage portion 6. In this case, it was investigated how the difference (variation in exhaust gas distribution) between the maximum inflow amount of exhaust gas and the minimum inflow amount of exhaust gas among the four intake passages 2 changes.

As an example, a simulation was performed in which the branching fraction (= La / (La + Lb)) was 0.4 or more and 0.6 or less.

As a comparative example, the simulation was performed when the branching fraction (= La / (La + Lb)) was 0.2 or more and less than 0.4, and more than 0.6 and 0.8 or less.

<result>
In FIG. 10, which shows the results of the simulation, the branch fraction is on the horizontal axis, and the “variation in exhaust gas distribution” is on the vertical axis. As a result of the simulation, it was confirmed that the "variation in exhaust gas distribution" when the branch fraction was 0.5 was the smallest. Therefore, the simulation result will be described with reference (value) of "variation in exhaust gas distribution" when the branching fraction is 0.5. The "variation in exhaust gas distribution" increases as the vertical axis shown in FIG. 10 goes up.

As a result of the simulation, the "variation in exhaust gas distribution" gradually increased as the branching fraction increased in the range where the branching fraction was larger than 0.5 with the branching fraction of 0.5 as the boundary. Further, it was confirmed that in the range where the branching fraction is smaller than 0.5, the "variation in exhaust gas distribution" gradually increases as the branching fraction decreases.

Further, the "variation in exhaust gas distribution" when the branch fractions of 0.4 and 0.6 in the embodiment are about four times the reference value ("variation in exhaust gas distribution" when the branch fraction is 0.5). It was confirmed that Regarding the "variation in exhaust gas distribution", a range in which the effect of reducing the "variation in exhaust gas distribution", which is practically effective at about 4 times or less of the standard value, can be obtained (hereinafter, "practically effective range"). It is described as). However, the present invention is not limited to the range of about 4 times or less of the reference value for "variation of exhaust gas distribution" (the branching fraction is limited to the range of 0.4 or more and 0.6 or less). is not it).

Further, a branch ratio of 0.45 or more and 0.55 or less, which is a range that can be reduced to about twice or less of the reference value, can obtain a more effective effect of reducing "variation in exhaust gas distribution". Therefore, it is a more preferable range than the above-mentioned "practically effective range".

In addition, the "variation in exhaust gas distribution" when the branch fractions are 0.3 and 0.7 in the comparative example is about 7 times the reference value ("variation in exhaust gas distribution" when the branch fraction is 0.5). It was confirmed that Therefore, it was confirmed that it deviates from the above "practically effective range".

Further, the "variation in exhaust gas distribution" when the branch fractions are 0.2 and 0.8 in the comparative example is about 10 times the reference value ("variation in exhaust gas distribution" when the branch fraction is 0.5). It was confirmed that Therefore, it was confirmed that it deviates from the above "practically effective range".

Therefore, in the intake passage arranging direction (A direction), the first length La of the second branch passage portion 6 arranged outside in the intake passage arranging direction is the first length La and the second arranged inside. Exhaust gas is effectively supplied to the four intake passages 2 by making it 0.4 times or more and 0.6 times or less the total of the second length Lb in the intake passage arrangement direction of the branch passage portion 6. It was confirmed that "variation in exhaust gas distribution" at the time of distribution can be suppressed. That is, it was confirmed that the exhaust gas distribution performance was effectively improved.

(Modification example)
It should be noted that the embodiments disclosed this time and examples thereof are examples in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment and its modifications, and further includes all modifications (mods) within the meaning and scope equivalent to the scope of claims. ..

For example, in the first to third embodiments, an example in which five fixing portions are provided is shown, but the present invention is not limited to this. In the present invention, two, three, four, or six or more fixing portions may be provided.

Further, in the first to third embodiments described above, an example is shown in which the external gas of the present invention is an exhaust gas recirculated from the exhaust device to the main body of the intake device, but the present invention is not limited to this. In the present invention, the external gas of the present invention may be blow-by gas or the like.

Further, in the first to third embodiments, the first length is 0.4 times or more and 0.6 times or less the total of the first length and the second length in the intake passage arranging direction. However, the present invention is not limited to this. In the present invention, the first length may be less than 0.4 times the total of the first length and the second length, or more than 0.6 times.

Further, in the first to third embodiments, the example in which the transverse engine includes the intake device of the present invention is shown, but the present invention is not limited to this. In the present invention, the longitudinal engine may include the intake device of the present invention.

Further, in the first to third embodiments, with reference to FIG. 3, in the direction in which the intake passages are arranged, the center line β of the introduction port 7 is set to the center line γ2 (the center line γ1 of the intake passage 2 and the intake passage 2). An example is shown in which the line is arranged inside the innermost end 2a), but the present invention is not limited to this. In the present invention, the center line β may be arranged between the center line γ1 and the center line γ2.

Further, in the second embodiment, an example is shown in which the two second branch passage portions arranged inside are communicated with each other by the communication passage portion in the direction in which the intake passages are arranged, but the present invention is not limited to this. In the present invention, the two second branch passage portions arranged on the outside may be communicated with each other by the communication passage portion in the direction in which the intake passages are arranged.

Further, in the third embodiment, as an embodiment different from the first embodiment, an intake device including an introduction port arranged at a position deviated from the intake passage is shown, but the present invention is limited to this. Absent. In the present invention, as an embodiment different from the second embodiment, the intake device may include an introduction port arranged at a position deviated from the intake passage.

Further, in the third embodiment, the reduced portion is formed as a through hole penetrating the upper resin member (resin member) by mold molding, but the present invention is not limited to this. In the present invention, the reduced portion may be formed as a through hole penetrating the resin member by cutting or the like.

Further, in the third embodiment, an example is shown in which an expansion portion and a reduction portion are provided in two of the introduction ports for introducing external gas into each of the four intake passages, but the present invention is not limited to this. .. In the present invention, expansion and reduction portions may be provided in one, three or four of the introduction ports for introducing external gas into each of the four intake passages.

Further, in the third embodiment, two of the introduction ports for introducing external gas into each of the four intake passages are a pair arranged on the upstream side passage portion side in the A direction (intake passage arrangement direction). Although an example of an inner inlet is shown, the present invention is not limited to this. In the present invention, two of the introduction ports for introducing external gas into each of the four intake passages are a pair of outer introduction ports arranged on the opposite side of the upstream passage portion in the intake passage arrangement direction. There may be. In this case, it is preferable that the pair of outer inlets are arranged at positions shifted toward the upstream passage portion with respect to the intake passage in the direction in which the intake passages are arranged.

Further, in the third embodiment, the intake device main body and the gas distribution passage are divided by three predetermined dividing surfaces, but the present invention is not limited to this. In the present invention, the intake device main body and the gas distribution passage may be divided by 1, 2 or 4 or more predetermined division surfaces.

Further, in the third embodiment, the extension portion is formed in a substantially rectangular shape when viewed from either one of the A directions (intake passage arranging directions), but the present invention is limited to this. Absent. In the present invention, the expansion portion may be formed in an elliptical shape other than a substantially rectangular shape when viewed from either one of the intake passage arranging directions.

Further, in the third embodiment, the bottom surface of the expansion portion on the opposite side of the reduction portion is located on the opposite side of the second branch passage portion in the A direction (intake passage arranging direction) toward the intake passage side. An example of tilting is shown, but the present invention is not limited to this. In the present invention, the bottom surface of the expansion portion on the opposite side of the reduction portion may extend along the direction in which the intake passages are arranged.

Further, in the third embodiment, an example is shown in which the plurality of resin members have a lower resin member, an EGR resin member, an upper resin member, and an intermediate resin member. Is not limited to this. In the present invention, the plurality of resin members may have 2, 3 or 5 or more resin members.

3 Flange part 4 Upstream side passage part 5 First branch passage part 6 Second branch passage part 7,307 Introduction port 31 Contact surface 32 Fixed part 32a First fixed part 32b Second fixed part 32c Third fixed part 100, 200 , 300 Intake device 101, 301 Intake device main body 102, 202, 302 Gas distribution passage 208 Communication passage part 310 Predetermined division surface 320 Resin member 371 Expansion part 372 Reduction part E2 Exhaust device La (2nd branch passage part) 1st Length Lb (of the second branch passage) Second length R1 (two first branch passages are provided) Range R2 (plural fixed sandwiching the two first branch passages from both sides in the intake passage alignment direction) Range where the part is provided) T1 (reduced part) flow path cross-sectional area T2 (extended part) flow path cross-sectional area

Claims (8)

The main body of the intake device including four intake passages arranged in series,
A gas distribution passage that is formed in a tournament shape in which the introduced external gas is gradually branched into one, two, and four as the external gas is introduced, and the external gas is distributed to the four intake passages. With and
The gas distribution passage is arranged between the inner two of the four intake passages in the intake passage arrangement direction in which the four intake passages are lined up, and the gas distribution passage is provided with one upstream passage portion into which the external gas is introduced. , Connected to the upstream side passage portion from the downstream side, and connected to the first branch passage portion from the downstream side with two first branch passage portions that branch the external gas from the upstream side passage portion into two. Includes four second branch passages that further branch the external gas from each of the first branch passages into two.
The intake device main body is further provided with a flange portion provided at the most downstream of the intake passage and having a contact surface that abuts on the cylinder head and a plurality of fixing portions that fix the intake device main body to the cylinder head. Including
The plurality of fixed portions are configured to sandwich the two first branch passage portions from both sides in the intake passage arranging direction when viewed from a direction orthogonal to the contact surface.
In each of the four intake passages in the direction in which the intake passages are arranged, the center line of the introduction port to which the second branch passage portion is connected and the external gas is introduced is more than the center line of the intake passage. An intake device located inside, which is on the upstream side passage side. In the intake passage arranging direction, the first length of the second branch passage portion arranged outside in the intake passage arranging direction is the first length and the second branch passage portion arranged inside. The intake device according to claim 1, wherein the intake device is 0.4 times or more and 0.6 times or less the total with the second length in the intake passage line-up direction. The plurality of fixing portions are
A pair of first fixed portions arranged on the lower side of the flange portion and sandwiching the gas distribution passage from both sides in the direction of arranging the intake passages.
It is arranged on the upper side of the flange portion, is arranged inside the pair of first fixed portions in the intake passage arranging direction, and sandwiches the first branch passage portion from both sides in the intake passage arranging direction. A pair of second fixing parts and
It includes one third fixing portion which is arranged on the lower side of the flange portion and is arranged substantially in the middle of the pair of second fixing portions in the intake passage arranging direction.
The pair of first fixing portions, the pair of second fixing portions, and the one third fixing portion are provided on the lower side and the upper side of the flange portion from one side to the other side in the intake passage arranging direction. Arranged alternately in a zigzag pattern,
In the vertical direction, the four second branch passage portions include the pair of second fixing portions on the upper side of the flange portion, the pair of first fixing portions on the lower side of the flange portion, and the one third fixing portion. The intake device according to claim 1 or 2, which is arranged between the fixed portion and the fixed portion. The range in which the two first branch passage portions are provided in the direction orthogonal to the intake passage arranging direction when viewed from the direction orthogonal to the contact surface is the range from both sides of the intake passage arranging direction. The intake device according to any one of claims 1 to 3, which overlaps with a range in which the plurality of fixed portions that sandwich the branch passage portion are provided. The gas distribution passage further includes one communication passage portion that communicates with the two inner second branch passage portions arranged on the upstream side passage portion side in the intake passage arrangement direction. The intake device according to any one of 4. The intake device according to any one of claims 1 to 5, wherein the external gas is an exhaust gas that is recirculated from the exhaust device to the intake device main body. The intake device main body and the gas distribution passage include a plurality of resin members that are divided by a predetermined division surface and are joined to each other to form the intake passage and the second branch passage portion.
At least one of the inlets for introducing external gas into each of the four intake passages is
An expansion portion formed by joining the plurality of resin members to each other,
The expansion portion and the second branch passage portion are communicated with each other in the external gas flow direction, and the second branch passage portion and a reduction portion having a flow path cross-sectional area smaller than the flow path cross-sectional area of the expansion portion are included.
The intake device according to any one of claims 1 to 6, wherein the reduced portion penetrates a resin member adjacent to the intake passage side of the second branch passage portion among the plurality of resin members. In the external gas flow direction, the expansion portion communicates the reduction portion with the intake passage.
The intake device according to claim 7, wherein the reduced portion is arranged outside the intake passage in the direction in which the intake passage is arranged when viewed from a direction orthogonal to the contact surface.

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