JP2010053833A - Intake manifold - Google Patents

Abstract

When an intake manifold is provided with a gas passage through which a gas to be mixed with intake air is provided, the distribution amount of the gas to the branch pipe is made uniform while the intake manifold is made compact.
An intake manifold (1) includes a surge tank portion (10) having an intake passage (R) through which intake air is introduced, and branch pipes (11, 13) connected to each cylinder of an internal combustion engine. A gas passage S into which a gas mixed with intake air is introduced is formed in the front wall portion 10a of the surge tank 10 so as to be partitioned from the intake passage R. The gas passage S extends to the branch pipes 11 and 13 along the front wall portion 10 a of the surge tank portion 10.
[Selection] Figure 2

Description

  The present invention relates to an intake manifold provided in an intake system of an internal combustion engine.

2. Description of the Related Art Conventionally, as disclosed in Patent Document 1, for example, an intake manifold having a gas passage for introducing a gas mixed with intake air into the intake passage is known. In the intake manifold of Patent Document 1, an overhang portion is integrally formed so as to protrude from the peripheral wall portion of the branch pipe connected to the cylinder of the internal combustion engine. The projecting portion extends in the direction in which the branch pipes are arranged. The gas passage is provided inside the overhanging portion.
JP 2006-241992 A

  However, the intake manifold of Patent Document 1 is provided with an overhanging portion protruding from the branch pipe in order to provide a gas passage. Therefore, the intake manifold is increased in size by the protruding portion protruding.

  Further, since it is desired to make the amount of gas flowing into each cylinder uniform, it is preferable to extend the gas passage to each branch pipe and introduce the gas directly from the gas passage into the branch pipe. However, when the gas passage is provided in the overhanging portion as in Patent Document 1, if the gas passage is extended, the overhanging portion becomes large and the intake manifold is further increased in size.

  The present invention has been made in view of such a point, and an object of the present invention is to make it possible to make the distribution amount of the gas distributed to the branch pipes uniform while making the intake manifold having the gas passage compact. is there.

  To achieve the above object, according to the first aspect of the present invention, there is provided a surge tank portion having an intake passage through which intake air is introduced, and a branch pipe communicating with the intake passage of the surge tank portion and connected to each cylinder of the internal combustion engine. The surge tank portion is formed with a gas passage into which the gas to be mixed with intake air is partitioned from the intake passage, and the gas passage is formed on the surge tank portion. It is set as the structure extended to a branch pipe along a surrounding wall part.

  According to a second aspect, in the first aspect, the surge tank portion includes a first member and a second member that are joined to each other, and the joint portion between the first member and the second member includes a gas A groove constituting the passage is formed, and an open portion of the groove is closed by a joint portion of the second member with the first member.

  According to the first invention, the gas passage through which the gas mixed into the intake air is introduced is formed in the surge tank portion so as to extend along the peripheral wall portion thereof, so that a conventional overhanging portion becomes unnecessary, An intake manifold having a gas passage extending to the branch pipe can be made compact. Since the gas passage extends to the branch pipe, the gas can be directly introduced into the branch pipe, and the distribution amount to the branch pipe can be made uniform.

  According to the second invention, the surge tank portion has the first member and the second member that are joined to each other, and the groove that forms the gas passage is formed in the joint portion of the first member. Since the open portion of the groove is closed by the joint portion of the second member, the gas passage can be easily formed by joining the first member and the second member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows an intake manifold 1 according to an embodiment of the present invention. The intake manifold 1 constitutes a part of an intake system of a horizontally opposed four-cylinder engine (not shown). The intake manifold 1 introduces a manifold main body 2 and exhaust gas into the intake passage R in the manifold main body 2. A gas introduction member 3. The manifold body 2 has a surge tank 10 and four branch pipes 11 to 14 branched from the surge tank 10. The exhaust gas of the present embodiment is so-called EGR gas.

  The intake manifold 1 has a shape that is long in the left-right direction of the vehicle in accordance with the mounting state of the engine. In the description of this embodiment, the left side of the vehicle is simply “left” for convenience of explanation. The right side of the vehicle is simply referred to as “right”, the front side of the vehicle is simply referred to as “front”, and the rear side of the vehicle is simply referred to as “rear”.

  As shown in FIG. 2, the surge tank portion 10 has a shape that is long in the left-right direction. As shown in FIG. 1, two left branch pipes 11 and 12 extend from the left end of the surge tank section 10, and two right branch pipes 13 and 14 extend from the right end. As shown in FIGS. 2 and 3, the left branch pipes 11 and 12 extend from the surge tank portion 10 in the left direction and then bend downward by approximately 90 °. The right branch pipes 13 and 14 extend from the surge tank portion 10 to the right and then bend downward by approximately 90 °. As shown in FIGS. 4 and 5, attachment plate portions 15 and 16 are formed at the lower end portions of the left branch pipes 11 and 12 and the right branch pipes 13 and 14, respectively. Bolts (not shown) that are screwed into the cylinder head are inserted into the mounting plate portions 15 and 16. The inside of the surge tank 10 is an intake passage R.

  As shown in FIG. 2, the upper wall portion that is a part of the peripheral wall portion of the surge tank portion 10 is formed substantially flat, while the lower wall portion that is a part of the peripheral wall portion of the surge tank portion 10 is Is bent downward so that the central part of the center is located at the bottom. Moreover, the front wall part 10a and the rear wall part which are a part of the surrounding wall part of the surge tank part 10 are extended in the up-down direction.

  The manifold body 2 is configured by combining three members: an upper member 20, a lower member (first member) 21, and a front member (second member) 22. The upper member 20 is formed by integrating the upper wall portion of the surge tank 10, the upper wall portion of the left branch pipes 11 and 12, and the upper wall portion of the right branch pipes 13 and 14. The lower member 21 is formed by integrating the rear wall portion and the lower wall portion of the surge tank portion 10, the remaining portions of the left branch pipes 11 and 12 and the remaining portions of the right branch tubes 13 and 14. The front member 22 is constituted by a front wall portion of the surge tank portion 10.

  The upper member 20, the lower member 21, and the front member 22 are formed by injection molding a resin material. The upper member 20 is provided with a joint portion 20 a that is joined to the lower member 21. Further, the lower member 21 is provided with a joint portion 21a to which the joint portion 20a of the upper member 20 is joined, and a joint portion 21b (shown in FIG. 3) to which the front member 22 is joined. The front member 22 is provided with a joint 22 a (shown in FIGS. 6 and 7) that is joined to the joint 21 b of the lower member 21. The joint portions 20a and 21a of the upper member 20 and the lower member 21 are welded by the vibration welding method, and the joint portions 21b and 22a of the lower member 21 and the front member 22 are also welded in the same manner. The upper member 20, the lower member 21, and the front member 22 may be welded by a welding method other than the vibration welding method.

  As shown in FIG. 1, an air inlet 25 is formed in the vicinity of the central portion in the left-right direction of the rear wall portion of the surge tank portion 10. Although not shown, a throttle body with a built-in throttle valve is fastened to the peripheral edge of the intake port 25. Further, an insertion port 26 (shown in FIGS. 6 and 7) into which the exhaust gas introduction member 3 is inserted is formed on the lower left side of the rear wall portion of the surge tank portion 10. An attachment portion 27 to which the exhaust gas introduction member 3 is fastened and fixed is formed at the peripheral edge portion of the insertion port 26. The attachment portion 27 is formed with a screw hole (not shown) extending in the front-rear direction. In addition, the attachment portion 27 is formed with a groove 29 into which a seal member 28 extending in an annular shape so as to surround the insertion opening 26 is fitted.

  An exhaust gas introduction hole 32 is formed on the inner surface of the front wall portion of the surge tank portion 10 so as to face the insertion port 26. A step portion 33 is formed around the introduction hole 32 so as to surround the introduction hole 32. As shown in FIG. 2, a gas passage S for distributing the exhaust gas to the four branch pipes 11 to 14 is formed in the lower portion of the front wall portion 10 a of the surge tank portion 10 and is partitioned from the intake passage R. ing. The gas passage S includes an upstream passage portion S1, and a left passage portion S2 and a right passage portion S3 that extend from the downstream end of the upstream passage portion S1 in the left-right direction.

  This gas passage S includes a groove 21c (shown in FIGS. 3, 6 and 7) formed in the joint portion 21a of the lower member 21, and a groove 22b (FIG. 6) formed in the joint portion 22a of the front member 22. 7 and FIG. 8).

  As shown in FIG. 6, the upstream end of the upstream passage portion S <b> 1 is located at the lower left portion of the front wall portion 10 a of the surge tank portion 10 and communicates with the introduction hole 32. The upstream side passage portion S1 extends from the introduction hole 32 along the lower wall portion of the surge tank portion 10 to the right side to a substantially central portion in the left-right direction.

  The left-side passage portion S2 extends to the left side along the upstream-side passage portion S1 below the upstream-side passage portion S1. The left passage portion S2 extends to the left side of the introduction hole 32 and then bends upward. As shown in FIG. 5, left bulges 40 that bulge downward are formed in the lower wall portions of the left branch pipes 11 and 12. The left bulge portion 40 is formed to have an L shape extending to the left side along the front left branch pipe 11 and then extending to the rear left branch pipe 12. As shown in FIG. 9, the downstream end of the left passage portion S <b> 2 extends in an L shape corresponding to the shape of the left bulging portion 40. As shown in FIGS. 4 and 9, a front discharge hole 11 a is formed in a lower wall portion of the front left branch pipe 11 at a portion facing the left bulging portion 40, and a lower wall of the rear left branch pipe 12 is formed. Similarly, a rear discharge hole 12a is formed in the portion. The front discharge hole 11a is located to the left of the rear discharge hole 12a.

  A plate 41 is provided in the left bulging portion 40 to prevent exhaust gas flowing from the upstream side of the left passage portion S2 from flowing directly to the front discharge hole 11a. As shown in FIG. 8, the plate 41 is integrally formed on the bottom surface of the groove 22b of the front member 22, and extends straight rearward through the right side of the front discharge hole 11a. The length and position of the plate 41 are set so that the exhaust gas flowing from the upstream side of the left passage portion S2 flows substantially evenly through the front discharge holes 11a and the rear discharge holes 12a.

  As shown also in FIG. 2, the right passage portion S <b> 3 extends to the right along the lower wall portion of the surge tank portion 10. As shown in FIG. 5, a right side bulging portion 42 that bulges downward is formed on the lower wall portion of the right branch pipes 13 and 14. The right bulge portion 42 is formed to have an L shape like the left bulge portion 40, and the right passage portion S 3 corresponds to the shape of the right bulge portion 42 in the right bulge portion 42. Is formed so that its downstream end extends in an L shape. As shown in FIG. 4, a front discharge hole 13 a is formed in the lower wall portion of the front right branch pipe 13 at a portion facing the right bulge portion 42, and the lower wall portion of the rear right branch pipe 14 is also formed. Similarly, a rear discharge hole 14a is formed.

  In the right bulging portion 42, as in the case of the plate 41, a plate 43 (see FIG. 4) for preventing the exhaust gas flowing from the upstream side of the right passage portion S3 from flowing directly to the front discharge hole 13a. 8). The plate 43 is also integrally formed on the bottom surface of the groove 22b of the front member 22.

  As shown in FIG. 10, the gas introduction member 3 includes an exhaust gas circulation pipe 50 into which exhaust gas is introduced, a mounting flange 51 provided in the exhaust gas circulation pipe 50, and an exhaust gas circulation pipe on the flange 51. The cylindrical member 52 provided so as to oppose the outer surface of 50 is integrated. The exhaust gas flow pipe 50, the flange 51, and the cylindrical member 52 are made of a material having higher heat resistance than the resin material constituting the manifold body 2, and are damaged under an atmosphere of about 300 ° C. such as a steel material. It is made of materials that do not.

  The flange 51 is formed so as to extend outward from the intermediate portion in the longitudinal direction of the exhaust gas circulation pipe 50, and extends along the attachment portion 27 of the manifold main body portion 2 as shown in FIGS. 6 and 7. Screw insertion holes 51 a and 51 a are formed in the flange 51 so as to coincide with the screw holes of the attachment portion 27. The gas introduction member 3 is fixed to the manifold body 2 by screwing screws (not shown) inserted through the screw insertion holes 51a into the screw holes.

  The exhaust gas circulation pipe 50 is constituted by a circular pipe member. A base end portion of the exhaust gas circulation pipe 50 protrudes outward from the surge tank portion 10, and a pipe extending from the exhaust system (not shown) is connected to the base end portion. The distal end portion of the exhaust gas circulation pipe 50 is located in the surge tank portion 10 and is crushed and closed in the radial direction. A plurality of slits (gas outlets) 50a, 50a that are open to the outer surface and extend in the axial direction are formed on the front end side of the flange 51 of the exhaust gas circulation pipe 50 at intervals in the circumferential direction.

  The cylindrical member 52 has a cylindrical shape surrounding the exhaust gas circulation pipe 50 and is disposed so as to face the intake passage R in the surge tank portion 10. The entire circumference of the proximal end portion of the cylindrical member 52 is airtightly joined to the flange 51. Further, the length of the cylindrical member 52 is set so that the tip of the cylindrical member 52 fits into the stepped portion 33 around the introduction hole 32 of the surge tank portion 10 in a state where the flange 51 is fixed to the mounting portion 27. ing. In a state of being fitted to the step portion 33, the tip end portion of the cylindrical member 52 is sealed by the inner surface of the step portion 33 so as to ensure airtightness.

  The inner diameter of the cylindrical member 52 is set larger than the outer diameter of the exhaust gas circulation pipe 50 by a predetermined dimension. As a result, a space in which the exhaust gas can be ejected from the slit 50a is formed between the exhaust gas circulation pipe 50 and the cylindrical member 52. Further, the outer diameter of the cylindrical member 52 is set smaller than that of the insertion port 26, so that the cylindrical member 52 does not contact the peripheral edge of the insertion port 26.

  Next, the case where the intake manifold 1 configured as described above is assembled to an engine and the engine is in an operating state will be described. The intake air sucked into the surge tank portion 10 from the intake port 25 through the throttle body flows in both the left and right directions, flows into the left branch pipes 11 and 12 and the right branch pipes 13 and 14, and is supplied to each cylinder of the engine. . On the other hand, the exhaust gas flowing through the exhaust system of the engine flows into the exhaust gas circulation pipe 50 of the exhaust gas introducing member 3 through the pipe. In addition, when the temperature of the exhaust gas which flows through piping is very high temperature of 500 degreeC or more, you may make it cool to about 300 degreeC by attaching a small heat exchanger (cooler) in the middle of piping.

  The exhaust gas flowing into the exhaust gas circulation pipe 50 is ejected between the cylindrical member 52 and the exhaust gas circulation pipe 50 from the slit 50a. At this time, since the cylindrical member 52 faces the slit 50 a, the exhaust gas blown out from the slit 50 a collides with the inner surface of the cylindrical member 52. Since the cylindrical member 52 faces the surge tank portion 10 where the intake air flows as described above, it is cooled by the intake air. Therefore, the temperature of the exhaust gas can be lowered without providing a large cooler. The temperature of the exhaust gas after being cooled in the cylindrical member 52 can be easily changed depending on the size, length, etc. of the cylindrical member 52. In this embodiment, the temperature is such that the resin material is not damaged ( For example, it is set to be about 150 ° C. or less.

  The exhaust gas in the cylindrical member 52 is introduced into the upstream passage portion S1 of the gas passage S through the introduction hole 32. Since the exhaust gas introduced into the upstream-side passage portion S1 is at a temperature that does not damage the resin material, damage to the manifold body portion 2 is suppressed. The exhaust gas that has flowed downstream in the upstream passage S1 is divided into the left passage portion S2 and the right passage portion S3, and flows through the passage portions S2 and S3 downstream. The exhaust gas flowing through the left passage portion S2 hits the plate 41 when flowing through the left bulging portion 40, and the momentum is weakened. As shown by the arrows in FIG. 9, the exhaust gas is substantially uniform in the front discharge hole 11a and the rear discharge hole 12a. And flows into the left branch pipes 11 and 12. The exhaust gas flowing into the left branch pipes 11 and 12 is taken into the cylinder together with the intake air. Similarly, the exhaust gas flowing through the right passage portion S3 flows into the right branch pipes 13 and 14 and is sucked into the cylinder.

  As described above, according to this embodiment, the gas passage S into which the exhaust gas mixed with the intake air is introduced is formed so as to extend along the front wall portion 10a of the surge tank portion 10. Such an overhang | projection part becomes unnecessary and the intake manifold 1 which has the gas channel | path S extended to the branch pipes 11-14 can be made compact. And since the gas passage S is extended to the branch pipes 11-14, exhaust gas can be directly introduced into the branch pipes 11-14, and the distribution amount to the branch pipes 11-14 can be made uniform.

  Further, the surge tank portion 10 includes a lower member 21 and a front member 22 that are joined to each other, and a groove 21c that constitutes the gas passage S is formed in the joint portion 21b of the lower member 21, Since the open portion of the groove 21c is closed by the joint 22a of the front member 22, the gas passage S can be easily formed by joining the lower member 21 and the front member 22.

  In this embodiment, the case where the intake manifold 1 is for a horizontally opposed four-cylinder engine has been described. However, the shape and number of the branch pipes 11 to 14 and the shape of the surge tank section 10 are not limited thereto. By doing so, it can be attached to an in-line engine or a V-type engine.

  Further, the exhaust gas introducing member 3 may be made of a highly heat resistant resin material.

  Moreover, in this embodiment, although the manifold main-body part 2 was comprised with three members, it may comprise not only this but two members, and may comprise four or more members.

  In this embodiment, the gas mixed in the intake air is EGR gas. However, the present invention is not limited to this, and may be, for example, fuel evaporative gas or blow-by gas generated in the fuel tank. When mixing a gas having a low temperature, the gas may be directly introduced into the gas passage S without using the exhaust gas introduction member 3.

  As described above, the intake manifold according to the present invention is suitable for distributing, for example, EGR gas, fuel evaporative gas generated in the fuel tank, blow-by gas, and the like to each cylinder.

It is a perspective view of the intake manifold which concerns on embodiment of this invention. It is a front view of an intake manifold. It is the perspective view which looked at the intake manifold of the state which removed the front side member from the front side. It is the perspective view which looked at the intake manifold of the state which removed the upper member from the upper side. It is the perspective view which looked at the intake manifold of the state which removed the front side member from the front side. It is sectional drawing in the VI-VI line of FIG. It is sectional drawing in the VII-VII line of FIG. It is the perspective view which looked at the front side member from the back side. It is sectional drawing in the IX-IX line of FIG. It is a perspective view of an exhaust gas introducing member.

Explanation of symbols

1 Intake Manifold 10 Surge Tank 10a Front Wall (Surround Wall) of Surge Tank
11-14 Branch pipe S Gas passage R Intake passage

Claims (2)

An intake manifold comprising a surge tank portion having an intake passage through which intake air is introduced, and a branch pipe connected to each cylinder of the internal combustion engine in communication with the intake passage of the surge tank portion;
In the surge tank portion, a gas passage into which a gas mixed with intake air is introduced is partitioned from the intake passage, and is formed.
The intake manifold according to claim 1, wherein the gas passage extends to a branch pipe along a peripheral wall portion of the surge tank portion. Intake manifold according to claim 1,
The surge tank portion has a first member and a second member joined to each other,
A groove constituting a gas passage is formed in a joint portion between the first member and the second member, and an open portion of the groove is blocked by a joint portion between the first member and the first member. An intake manifold characterized by

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