JP2019082119A - Intake manifold - Google Patents

Abstract

To provide an intake manifold which can avoid the enlargement of a physique while reducing a cost and weight by decreasing the number of part items, and can uniformly distribute a gas generated in an engine to branch pipes.SOLUTION: A synthetic-resin made intake manifold 1 according to the invention comprises a plurality of spiral branch pipes 2a to 2c which are aligned in parallel with one another, and a surge tank 3 connected with base end sides of the branch pipes. A gas passage part 21 for supplying a gas generated in an engine 4 to the plurality of the branch pipes is integrally arranged at the inside of a spiral shape of the plurality of the branch pipes. Then, a gas introduction port 22 connected to an engine side, and introducing the gas therein from the engine side is formed at the gas passage part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an intake manifold, and more particularly to a synthetic resin intake manifold in which proximal ends of a plurality of spiral branch pipes connected in parallel are connected to a surge tank.

  As a conventional intake manifold, a synthetic resin intake manifold is generally known, in which proximal ends of a plurality of spirally arranged branch pipes are connected to a surge tank. In this intake manifold, it has been proposed that an engine supply a part of exhaust gas after combustion for the purpose of reducing nitrogen oxides (NOx) in exhaust gas and improving fuel consumption. For example, an intake manifold has been proposed in which a metal pipe is connected to a surge tank, and exhaust gas is supplied into the surge tank via the metal pipe and distributed to each branch pipe. However, in this intake manifold, the flow of air in the surge tank changes according to the number of revolutions of the engine, so the variation of the distribution amount of exhaust gas to each branch becomes large. Furthermore, because metal pipes are required, there is a concern of increased costs and increased weight.

  Therefore, as a technique for solving the above problems, an intake manifold having a gas passage portion for directly distributing the exhaust gas to each branch pipe without using a surge tank has been proposed (see, for example, Patent Documents 1 and 2) . The patent document 1 describes that a gas passage is formed outside the spiral shape of a plurality of branch pipes, and the gas passage is closed by a lid cover to form a gas passage portion. A gas introduction port connected to a communication pipe (for example, a rubber hose, piping, etc.) with the exhaust system is provided at one end side of the gas passage portion. Furthermore, Patent Document 2 describes that a gas passage portion is integrally provided outside the spiral shape of a plurality of branch pipes. A gas inlet port connected to a communication pipe with the exhaust system is provided at one end side of the gas passage portion.

Unexamined-Japanese-Patent No. 2015-163769 Patent No. 5316349 gazette

  However, in the intake manifold described in Patent Document 1 described above, since the gas passage is closed by closing the gas passage with the lid cover, the lid cover of another member is essential, and the number of parts and the weight increase. I have a concern. Further, in the intake manifold described in Patent Documents 1 and 2, the gas introduction port connected to the communication pipe with the exhaust system is provided on one end side of the gas passage portion, so the communication pipe of another member is provided. There is a concern that the number of parts and weight will increase. Furthermore, in the intake manifolds described in Patent Documents 1 and 2 described above, since the gas passage portion is provided outside the spiral shape of the plurality of branch pipes, the physique becomes large and it is not practical.

  In addition to the case where the exhaust gas generated by the engine is supplied to the intake manifold, the above-mentioned problem occurs substantially similarly even when the blowby gas generated by the engine is supplied to the intake manifold, for example.

  The present invention has been made in view of the above-mentioned present situation, and it is possible to reduce the number of parts and achieve cost reduction and weight reduction while avoiding an increase in physique while equally distributing the gas generated by the engine to each branch pipe It is an object of the present invention to provide an intake manifold that can be

In order to solve the above-mentioned problems, the invention according to claim 1 is an intake made of synthetic resin including a plurality of spirally arranged branch pipes disposed side by side and a surge tank to which the base end side of the branch pipes is connected. A gas passage portion for supplying a gas generated by an engine to each of the plurality of branch pipes is integrally provided on the inner side of a spiral of the plurality of branch pipes, the manifold being a manifold. The gist of the present invention is that a gas inlet port is provided which is connected to the engine side and introduces gas from the engine side.
According to a second aspect of the present invention, in the first aspect, the gas passage portion is integrally provided with the wall of the surge tank by joining a plurality of members constituting the intake manifold. Make it a gist.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein a flange portion connected to the engine side is provided on the tip end side of the plurality of branch pipes, and the gas inlet The gist of the present invention is that the flange portion is provided.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein in the gas passage portion, a gas passage extending in a direction crossing the plurality of branch pipes, the gas passage, and An outlet hole communicating with each of the plurality of branch pipes, and a communication path connecting the gas passage and the gas introduction port are formed.
The invention according to a fifth aspect is the invention according to the fourth aspect, wherein the outlet hole is formed in a projection provided to project inward in the branch pipe, and the projecting end face of the projection is the outlet A gist is that the hole is formed in an inclined shape so as to open toward the downstream side of the branch pipe.
The invention according to claim 6 is the invention according to claim 4 or 5, wherein the gas passage is provided such that the gas passage extends in the horizontal direction when the intake manifold is mounted on a vehicle. To be a summary.

According to the intake manifold of the present invention, the gas passage portion for supplying the gas generated by the engine to each of the plurality of branch pipes is integrally provided inside the spiral shape of the plurality of branch pipes, The gas inlet is connected to the engine side to introduce gas from the engine side. Then, the gas generated by the engine is introduced from the engine side into the gas passage through the gas inlet and distributed to each branch. As a result, it is not necessary to provide a conventional separate lid cover and a connecting pipe with the exhaust system, and it is possible to reduce the number of parts and achieve cost reduction and weight reduction while avoiding an increase in physique. Furthermore, since the gas generated by the engine is directly distributed to each branch pipe without passing through the surge tank, the gas generated by the engine can be equally distributed to each branch pipe.
In the case where the gas passage portion is integrally provided with the wall of the surge tank by joining a plurality of members constituting the intake manifold, the gas passage portion is formed using the wall of the surge tank. Since the configuration can be made, further cost reduction and weight reduction can be achieved.
Moreover, the flange part connected to the said engine side is provided in the front end side of several said branch pipe, When the said gas introduction port is provided in the said flange part, the flange of several branch pipes Since the gas inlet can be set using a part, cost and weight can be further reduced.
When the gas passage, the gas outlet, the outlet hole, and the communication passage are formed in the gas passage, the gas introduced into the gas passage from the gas inlet passes the gas passage through the communication passage. It flows and is distributed to each branch pipe through each outlet hole.
Further, the outlet hole is formed in a projection provided to project inward in the branch pipe, and a projecting end surface of the projection is formed such that the outlet hole opens toward the downstream side of the branch pipe. In the case of the inclined shape, the backflow to the gas passage side of the gas distributed and supplied from the outlet hole into the branch pipe is prevented.
Furthermore, when the gas passage is provided so that the gas passage extends in the horizontal direction when the intake manifold is mounted on a vehicle, when condensed water of the gas is generated in the gas passage, The condensed water can be dispersed and flowed into each outlet hole.

The invention will be further described in the following detailed description referring to the non-limiting examples of exemplary embodiments according to the invention and with reference to the several figures referred to, but like reference numerals in the drawings. Similar parts are shown throughout the several figures.
It is a top view of the intake manifold concerning an example. It is the II-II line longitudinal cross-section enlarged view of FIG. It is the III arrow enlarged view of FIG. It is an exploded perspective view of the above-mentioned intake manifold. It is the perspective view seen from the bottom of the 1st member which constitutes the above-mentioned intake manifold. It is the perspective view seen from the plane of the 2nd member which constitutes the above-mentioned intake manifold. It is the perspective view seen from the bottom of the above-mentioned 2nd member. It is the perspective view seen from the plane of the 3rd member which constitutes the above-mentioned intake manifold. It is explanatory drawing for demonstrating the exit hole which concerns on an Example, and shows typically the longitudinal cross-section in alignment with the longitudinal direction of the branch pipe of an intake manifold. It is a longitudinal cross-sectional view of the intake manifold concerning a modification. It is a longitudinal cross-sectional view of the intake manifold which concerns on another modification.

  The matter set forth herein is illustrative and is for the purpose of illustrating the embodiments of the invention and is intended to provide the most effective and easily understood explanation of the principles and conceptual features of the invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to show the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention, and some forms of the present invention will It will be apparent to those skilled in the art how it may be embodied in practice.

  The intake manifold according to the present embodiment is made of synthetic resin including a plurality of spiral branch pipes (2a, 2b, 2c) arranged in parallel and a surge tank (3) to which the base end side of the branch pipe is connected. In the intake manifold (1, 31), a gas passage portion (21) for supplying gas generated by the engine (4) to each of the plurality of branch pipes is integrated inside the spiral shape of the plurality of branch pipes The gas passage portion is provided with a gas introduction port (22) connected to the engine side and introducing gas from the engine side (see, for example, FIGS. 1 to 4). The gas passage (21) is usually a portion forming an internal space such as a gas passage partitioned from the outside.

  As an intake manifold according to the present embodiment, for example, the gas passage portion (21) is formed of a surge tank by joining a plurality of members (11, 12, 13) constituting the intake manifold (1, 31). The form (refer, for example, FIG. 2 etc.) provided integrally with the wall (3a) is mentioned.

  As an intake manifold according to the present embodiment, for example, a flange portion (5) connected to the engine (4) side is provided on the tip end side of the plurality of branch pipes (2a to 2c), and gas introduction The form (refer, for example, FIG. 3 grade etc.) in which the opening (22) is provided in the flange part (5) is mentioned.

  As the intake manifold according to the present embodiment, for example, the gas passage (21) includes a plurality of gas passages (24) extending in a direction crossing the plurality of branch pipes (2a to 2c) and a plurality of gas passages (24). In the embodiment, an outlet hole (25) communicating with each of the branch pipes (2a to 2c) and a communication path (26) communicating the gas passage (24) and the gas inlet (22) are formed. (For example, refer to FIG. 2 etc.). In this case, for example, one end side of the communication path (26) can be connected to the longitudinal center of the gas passage (24).

  In the case of the above-mentioned embodiment, for example, the outlet hole (25) is formed in a projection (29) provided to project inward in the branch pipe (2a to 2c), and the projection end face of the projection is the outlet hole Can be formed in an inclined shape so as to open toward the downstream side of the branch pipe (see, for example, FIG. 9 and the like).

  In the case of the above-described embodiment, for example, when the intake manifold (31) is mounted on a vehicle, the gas passage (24) can be provided so as to extend in the horizontal direction (for example) For example, refer to FIG. The term "extending in the horizontal direction" is intended to be a state extending substantially in the horizontal direction, and includes a state extending obliquely at ± 5 degrees with respect to the horizontal direction.

  In the case of the above embodiment, for example, the downstream side portions of the plurality of branch pipes (2a to 2c) and the surge tank (3) are formed by joining the first member (11) and the second member (12) The upstream side portions of the plurality of branch pipes (2a to 2c) are formed by joining the third member (13) and the fourth member (14), and the gas passage (24) is a second member (2) 12) and the third member (13), and the communication path (26) is formed between the first member (11) and the second member (12), and the outlet hole ( 25) can be formed in the 3rd member (13) (for example, refer to FIG. 4 etc.). Thereby, further cost reduction and weight reduction can be achieved.

  In addition, the code | symbol in the parenthesis of each structure described by the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described by way of examples using the drawings. In the present embodiment, an intake manifold used in an in-line three-cylinder engine is illustrated as the "intake manifold" according to the present invention. Furthermore, in FIGS. 1, 2 and 10, etc., the vehicle width direction is indicated by symbol P, the vehicle longitudinal direction is indicated by symbol Q, and the vehicle height direction is indicated by symbol R when the intake manifold is mounted on the vehicle. .

(1) Configuration of Intake Manifold As shown in FIGS. 1 to 3, the intake manifold 1 according to the present embodiment includes a plurality of (three in the drawing) spiral branch pipes 2a, 2b and 2c arranged in parallel. , And a surge tank 3 to which the proximal ends of the branch pipes 2a to 2c are connected. Each of these branch pipes 2a to 2c is formed in a three-dimensional spiral shape. Moreover, the flange part 5 connected by the bolt fastening etc. is provided in the engine 4 side (for example, cylinder head etc.) by the front end side of branch pipe 2a-2c. A seal member 10 is mounted on the mounting surface of the flange portion 5 on the engine 4 side so as to surround the openings of the branch pipes 2a to 2c and a gas inlet 22 described later (see FIG. 3). Furthermore, the surge tank 3 is formed in the shape of a container capable of temporarily storing the air sent from the feed port 6.

  In the present embodiment, the branch pipes 2a to 2c in which the tip end side (outlet side) is partitioned into two are illustrated, but the present invention is not limited thereto. For example, a branch in which the tip end is not partitioned into two A tube may be employed.

  As shown in FIG. 4, the intake manifold 1 is configured by joining a first member 11, a second member 12, a third member 13, and a fourth member 14 made of synthetic resin by vibration welding or the like. By joining the first member 11 and the second member 12, the downstream portions of the branch pipes 2a to 2c and the surge tank 3 are formed (see FIGS. 5 and 6). Moreover, the upstream part of each branch pipe 2a-2c is formed by joining the 3rd member 13 and the 4th member 14 (refer FIG. 8). Furthermore, by joining the second member 12 and the third member 13, the upstream side portion and the downstream side portion of each of the branch pipes 2a to 2c are connected, and the proximal end sides of the respective branch pipes 2a to 2c The surge tank 3 is connected (see FIGS. 7 and 8).

  Inside the spiral shape of the plurality of branch pipes 2a to 2c, as shown in FIGS. 2 and 4, the exhaust gas ("EGR (Exhaust Gas Recirculation) gas") generated in the engine 4 in each of the branch pipes 2a to 2c The gas passage 21 for supplying the same is integrally provided. At one end side of the gas passage portion 21, there is provided a gas introduction port 22 connected to the engine 4 side (specifically, an EGR cooler of a cylinder head, etc.) to introduce exhaust gas from the engine 4 side. . The gas introduction port 22 is provided in the flange portion 5 on the tip side of the plurality of branch pipes 2a to 2c (see FIG. 3). Then, as described above, a part of the exhaust gas after combustion of the engine 4 is supplied to the intake manifold 1 and is re-intake by the engine 4 to reduce nitrogen oxides (NOx) mainly in the exhaust gas. And fuel efficiency can be improved.

  Here, although a cavity is generally provided inside the plurality of branch pipes 2a to 2c, in the present embodiment, the gas passage portion 21 is set using the cavity. Therefore, the physical size of the intake manifold 1 does not increase as compared with that in which the gas passage portion 21 is not set. On the other hand, in the case where the gas passage portion is set outside the spiral shape of the plurality of branch pipes as in the prior art, the physique of the intake manifold is increased.

  As shown in FIG. 2, the gas passage portion 21 has a gas passage 24 extending in a direction crossing the plurality of branch pipes 2a to 2c, and an outlet hole 25 for communicating the gas passage 24 with the branch pipes 2a to 2c. , And a communication passage 26 which connects the gas passage 24 and the gas inlet 22. The outlet holes 25 are formed through the walls of the branch pipes 2a to 2c. Further, the gas passage portion 21 is provided such that when the intake manifold 1 is mounted on the vehicle, the gas passage 24 is inclined at about 30 degrees with respect to the horizontal direction (specifically, the vehicle longitudinal direction Q) .

  As shown in FIG. 9, the outlet hole 25 is formed in a projection 29 provided on the branch pipes 2a to 2c so as to protrude inward. The projecting end face of the projection 29 is formed in an inclined shape so that the outlet hole 25 opens toward the downstream side of the branch pipes 2a to 2c. Specifically, the projecting end surface of the projection 29 is inclined at a predetermined inclination angle (for example, 35 to 55 degrees) with respect to the axis of the branch pipes 2a to 2c. Further, as shown in FIG. 2, one end side of the connection path 26 is connected to the central portion in the longitudinal direction of the gas passage 24. In addition, the communication path 26 is expanded rather than the gas introduction port 22 for pressure loss adjustment.

  The gas passage portion 21 joins the first to third members 11, 12 and 13 so that the wall 3a of the surge tank 3 and the surface side of the plurality of branch pipes 2a to 2c (specifically, the plurality of branch pipes It is provided integrally with the proximal end surface side of 2a-2c). The gas passage 24 is formed between the second member 12 and the third member 13 (see FIGS. 7 and 8). Also, the communication path 26 is formed between the first member 11 and the second member 12 (see FIGS. 5 and 6). Furthermore, the outlet hole 25 is formed in the third member 13 (see FIG. 8).

(2) Operation of Intake Manifold Next, the operation of the intake manifold 1 configured as described above will be described. As shown in FIG. 2, a part g of exhaust gas generated by the engine 4 (indicated by a broken arrow in the figure) is introduced from the engine 4 side into the gas passage 21 through the gas inlet 22 and It is distributed and supplied to the branch pipes 2a to 2c. Specifically, the exhaust gas g introduced into the gas passage 21 flows in the gas passage 24 through the communication passage 26 and is distributed and supplied to the branch pipes 2 a to 2 c through the outlet holes 25. The exhaust gas g supplied to the branch pipes 2a to 2c is recirculated to the intake side of the engine 4 together with the air sent from the surge tank 3 to the branch pipes 2a to 2c. On the other hand, the condensed water w generated in the upstream of the intake manifold 1 or in the intake manifold 1 is equally distributed and inflowed to the branch pipes 2 a to 2 c through the outlet holes 25.

(3) Effects of the Embodiment According to the intake manifold 1 of the present embodiment, the exhaust gas g generated by the engine 4 in each of the plurality of branch pipes 2a to 2c is formed inside the spiral of the plurality of branch pipes 2a to 2c. A gas passage portion 21 for supplying is integrally provided, and the gas passage portion 21 is provided with a gas inlet 22 connected to the engine 4 side for introducing the exhaust gas g from the engine 4 side. There is. Then, the exhaust gas g generated by the engine 4 is introduced into the gas passage 21 from the side of the engine 4 through the gas inlet 22 and distributed and supplied to the branch pipes 2a to 2c. As a result, it is not necessary to provide a conventional separate lid cover and a connecting pipe with the exhaust system, and it is possible to reduce the number of parts and achieve cost reduction and weight reduction while avoiding an increase in physique. Furthermore, since the exhaust gas generated by the engine 4 is directly distributed to the branch pipes 2a to 2c without passing through the surge tank 3, the exhaust gas generated by the engine 4 is equally distributed to the branch pipes 2a to 2c. Can.

  Further, in the present embodiment, the gas passage portion 21 is provided integrally with the wall 3 a of the surge tank 3 by joining the plurality of members 11, 12 and 13 which constitute the intake manifold 1. As a result, the gas passage portion 21 can be configured by using the wall 3 a of the surge tank 3, so that the cost and weight can be further reduced.

  Further, in the present embodiment, the flange portion 5 connected to the engine 4 side is provided on the tip end side of the plurality of branch pipes 2a to 2c, and the gas inlet 22 is provided in the flange portion 5 . Thereby, since the gas inlet 22 can be set using the flange part 5 of several branch pipe 2a-2c, the further cost reduction and weight reduction can be achieved.

  Further, in the present embodiment, the gas passage 24, the outlet hole 25, and the connection passage 26 are formed in the gas passage portion 21. Thus, the exhaust gas g introduced from the gas inlet 22 into the gas passage 21 flows through the communication passage 26 through the gas passage 24 and is distributed and supplied to the branch pipes 2 a to 2 c via the outlet holes 25. Be done. In particular, in the present embodiment, one end side of the connection path 26 is connected to the longitudinal center of the gas passage 24. As a result, the condensed water w generated in the upstream of the intake manifold 1 and in the intake manifold 1 is evenly distributed and inflowed to the branch pipes 2 a to 2 c through the outlet holes 25. Thus, the distribution of the condensed water w together with the gas g is enhanced.

  Further, in the present embodiment, the outlet hole 25 is formed in a projection 29 provided in the branch pipes 2a to 2c so as to project inward, and the projection end face of the projection 29 has branch holes 2a to 2c. It is formed in an inclined shape so as to open toward the downstream side of the. Thereby, the backflow to the gas passage 24 side of the gas distributed and supplied from the outlet hole 25 into the branch pipes 2a to 2c is prevented.

  Furthermore, in the present embodiment, the downstream side portions of the plurality of branch pipes 2a to 2c and the surge tank 3 are formed by joining the first member 11 and the second member 12, and the plurality of branch pipes 2a to 2c The upstream side portion is formed by joining the third member 13 and the fourth member 14, the gas passage 24 is formed between the second member 12 and the third member 13, and the communication path 26 is formed. The outlet hole 25 is formed in the third member 13 and is formed between the first member 11 and the second member 12. Thereby, further cost reduction and weight reduction can be achieved.

<Modification>
Next, an intake manifold 31 according to a modification of the intake manifold 1 will be described. In the intake manifold 31, as shown in FIG. 10, in the gas passage portion 21, when the intake manifold 31 is mounted on a vehicle, the gas passage 24 extends in the horizontal direction (specifically, the vehicle longitudinal direction Q). It is provided. Therefore, the condensed water w generated in the upstream of the intake manifold 31 or in the intake manifold 31 is equally distributed and inflowed to the branch pipes 2 a to 2 c through the outlet holes 25. Thus, the distribution of the condensed water w together with the gas g is enhanced.

  According to the intake manifold 31 according to the present modification, in addition to achieving substantially the same function / effect as the intake manifold 1, the gas passage portion 21 has the gas passage 24 horizontal when the intake manifold 31 is mounted on a vehicle. As it is provided so as to extend in the direction, when the condensed water w of the exhaust gas is generated in the gas passage 24, the condensed water w can be dispersed and flowed into the respective outlet holes 25.

  In the present invention, the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention according to the purpose and application. That is, in the above embodiment, the EGR passage 21 for supplying the exhaust gas generated by the engine 4 to the branch pipes 2a to 2c is illustrated as the gas passage, but the invention is not limited thereto. Alternatively, or in addition, blow-by gas generated by the engine 4 may be supplied to the branch pipes 2a to 2c as a PCV passage.

  Moreover, in the said Example, although the gas passage part 21 integrally provided between the wall 3a of the surge tank 3 and the surface side of several branch pipe 2a-2c was illustrated, it is not limited to this, For example, a surge A gas passage may be provided integrally with the surface side of the plurality of branch pipes 2 a to 2 c at a position separated from the tank 3.

  Moreover, in the said Example, although the gas inlet 22 was provided in the flange part 5 of the front end side of several branch pipe 2a-2c, it is not limited to this, For example, the engine 4 is independent from the flange part 5 The gas inlet 22 may be provided in the connection part connected to the side.

  Further, although the communication path 26 connected to the central portion in the longitudinal direction of the gas passage 24 is illustrated in the above embodiment, the present invention is not limited thereto. For example, as shown in FIG. The connection 26 may be connected to the end.

  In the above embodiment, the intake manifolds 1 and 31 including three branch pipes 2a to 2c are illustrated. However, the present invention is not limited thereto. For example, an intake manifold including two or four or more branch pipes is also possible. Good.

  Moreover, in the said Example, although the intake manifold 1, 31 comprised joining four members 11-14 was illustrated, it is not limited to this, For example, two, three or five or more members are joined, It may be configured as an intake manifold.

  Furthermore, although the form which joined the some resin members 11-14 by vibration welding was illustrated in the said Example, it is not limited to this, For example, laser welding, ultrasonic welding, the some resin members 11-14, It may be made to join by heat welding, induction welding, adhesives etc.

  The foregoing examples are for illustrative purposes only and are not to be construed as limitations on the present invention. While the present invention has been described by way of exemplary embodiments, it is understood that the words used in the description and illustration of the present invention are illustrative and exemplary rather than restrictive. Changes may be made within the scope of the appended claims without departing from the scope or spirit of the invention in its form, as detailed herein. While the specification herein has been directed to specific structures, materials, and examples, the present invention is not intended to be limited to the particulars disclosed herein, but rather is as follows: It shall cover all functionally equivalent structures, methods, and uses within the scope.

  The invention is not limited to the embodiments detailed above, but various modifications or alterations are possible within the scope of the claims of the invention.

  The present invention is widely used as a technique relating to an intake manifold for introducing air into a combustion chamber of an engine used in vehicles such as passenger cars, buses, trucks and the like.

  1, 31: Intake manifold, 2a to 2c, branch pipe, 3: surge tank, 3a: wall of surge tank, 4: engine, 5: flange portion, 11: first member, 12: second member, 13: first 3 members, 21; gas passage portion, 22; gas inlet, 24; gas passage, 25; outlet hole, 26; communication passage, 29; projection, g;

Claims (6)

A synthetic resin intake manifold comprising: a plurality of spiral branch pipes arranged in parallel; and a surge tank to which the base end side of the branch pipe is connected,
Inside the spiral shape of the plurality of branch pipes, a gas passage portion for supplying an engine generated gas to each of the plurality of branch pipes is integrally provided;
An intake manifold characterized in that the gas passage portion is provided with a gas introduction port connected to the engine side and introducing gas from the engine side.   The intake manifold according to claim 1, wherein the gas passage portion is integrally provided with a wall of the surge tank by joining a plurality of members constituting the intake manifold.   The intake manifold according to claim 1 or 2, wherein a flange portion connected to the engine side is provided on the tip end side of the plurality of branch pipes, and the gas inlet is provided in the flange portion. .   The gas passage portion includes a gas passage extending in a direction crossing the plurality of branch pipes, an outlet hole communicating the gas passage with each of the plurality of branch pipes, the gas passage, and the gas inlet port. The intake manifold according to any one of claims 1 to 3, wherein a communication path to communicate with is formed. The outlet hole is formed in a projection provided to project inward to the branch pipe,
The intake manifold according to claim 4, wherein the projecting end surface of the projection is formed in an inclined shape such that the outlet hole opens toward the downstream side of the branch pipe.   The intake manifold according to claim 4 or 5, wherein the gas passage portion is provided such that the gas passage extends in a horizontal direction when the intake manifold is mounted on a vehicle.

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