JP2010065628A - Resin intake manifold for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin intake manifold for an internal combustion engine, provided in the internal combustion engine having an exhaust gas recirculation device and supplying intake air to each cylinder. <P>SOLUTION: This resin intake manifold arranged in the internal combustion engine having a plurality of cylinders, and having communication portions 22a to 22d sectionally formed and communicating with the cylinders by mutually joining a resin upper member and a resin lower member, includes an exhaust gas introducing passage 15 interposed between joint surfaces of the upper member and lower member and extending along the joint surfaces. The exhaust gas introducing passage 15 includes an introducing port 25 for introducing exhaust gas into the exhaust gas introducing passage 15, lead-out ports 27a to 27d for leading out exhaust gas in the exhaust gas introducing passage 15 through the communication portions 22a to 22d, and an operating valve 32. An exhaust gas flow condition in the exhaust gas introducing passage 15 is controlled through open/close control over the operating valve 32, thereby equally discharging exhaust gas into each cylinder. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin intake manifold of an internal combustion engine that is provided in an internal combustion engine having an exhaust gas recirculation device and supplies intake air to each cylinder.

  As an intake manifold provided in an intake system of an internal combustion engine, there is known an intake manifold formed of a resin material for the purpose of weight reduction or the like. Such a resin intake manifold is generally divided into a plurality of members, which are joined together to be integrated. As a result, even an intake manifold having a complicated shape can be easily formed, and the degree of freedom in shape can be increased.

By the way, the internal combustion engine is generally provided with an EGR device for returning a part of the exhaust discharged into the exhaust passage to each cylinder. For example, in the resin intake manifold described in Patent Document 1, an EGR pipe for returning a part of the exhaust gas to each cylinder is connected in this way, and the exhaust gas introduced from the EGR pipe is distributed to each cylinder. I have to. In this way, exhaust gas is introduced into each cylinder through the resin intake manifold, so that the combustion temperature of the air-fuel mixture can be lowered to reduce the NOx emission amount.
JP-A-8-31469

  However, in the configuration in which exhaust is introduced into the resin intake manifold as described above, the following problems may occur. That is, the exhaust gas introduced into the resin intake manifold may be supplied to each cylinder before it is sufficiently mixed with the intake air in the intake manifold. As a result, the amount of exhaust gas introduced into each cylinder cannot be made uniform, resulting in variations.

  The present invention has been made in view of such conventional circumstances, and an object thereof is to provide a resin intake manifold provided in an internal combustion engine having a plurality of cylinders, and to appropriately distribute exhaust to each cylinder. It is an object of the present invention to provide a resin intake manifold for an internal combustion engine that can avoid variations in the amount of exhaust gas introduced into each cylinder.

In the following, means for achieving the above object and its effects are described.
According to a first aspect of the present invention, a resin-made upper member is provided in an intake system of an internal combustion engine having a plurality of cylinders and having an exhaust gas recirculation device that recirculates exhaust gas discharged from the cylinders into an exhaust passage to the cylinders. In the resin intake manifold of the internal combustion engine in which a plurality of communication portions communicating with the respective cylinders of the internal combustion engine are defined by joining together the resin lower member and the resin lower member, the upper member and the lower member are joined together An exhaust introduction passage extending between the surfaces and extending along the joint surface, an introduction port communicating with the exhaust introduction passage and introducing exhaust gas from the exhaust passage to the exhaust introduction passage, The gist of the present invention is that a lead-out port is formed which opens at each communication portion and leads out the exhaust gas from the exhaust introduction passage to each communication portion.

  According to this configuration, the exhaust gas introduced into the exhaust gas introduction passage through the introduction port is distributed from the lead-out port to each communication portion and then introduced from the communication portion to the corresponding cylinder. Therefore, the exhaust can be appropriately distributed to each cylinder, and it is possible to avoid the occurrence of variation in the amount of exhaust introduced into each cylinder.

  According to a second aspect of the present invention, in the resin intake manifold of the internal combustion engine according to the first aspect, a spacer is interposed between the joint surfaces of the upper member and the lower member, and the exhaust is disposed inside the spacer. The gist is that an introduction passage is formed.

  According to this configuration, the exhaust introduction passage is formed in advance in the spacer, and the spacer is interposed between the upper member and the lower member, so that the exhaust introduction passage is connected to the joint surface of the upper member and the lower member. Can be easily interposed between the two.

The invention according to claim 3 is the resin intake manifold of the internal combustion engine according to claim 2, wherein the spacer is made of a heat resistant resin.
According to this configuration, thermal deformation of the spacer due to exhaust heat can be suppressed.

  According to a fourth aspect of the present invention, a resin-made upper member is provided in an intake system of an internal combustion engine having a plurality of cylinders and having an exhaust gas recirculation device that recirculates exhaust gas discharged from the cylinders into an exhaust passage to the cylinders. In the resin intake manifold of the internal combustion engine in which a plurality of communication portions that communicate with the respective cylinders of the internal combustion engine are partitioned by joining the resin and the resin lower member to each other, a joint portion between the upper member and the lower member The inner wall is formed with a recess extending along the joint, and a pipe having an inside as an exhaust introduction passage is fitted into the recess, and the pipe communicates with the exhaust introduction passage and is exhausted. Are introduced into the exhaust introduction passage from the exhaust passage, and a lead-out port that opens at each communication portion and leads the exhaust introduction passage to the communication portion, respectively. It is that the gist comprising.

  According to this configuration, the exhaust gas introduced into the pipe exhaust introduction passage through the introduction port is distributed to each communication portion from the lead-out port formed in the pipe, and then introduced to each corresponding cylinder from the communication portion. Will come to be. Therefore, the exhaust can be appropriately distributed to each cylinder, and it is possible to avoid the occurrence of variation in the amount of exhaust introduced into each cylinder.

The invention according to claim 5 is the resin intake manifold of the internal combustion engine according to claim 4, wherein the pipe is made of a heat resistant resin.
According to this configuration, it is possible to suppress thermal deformation of the pipe due to exhaust heat.

  The invention according to claim 6 is the resin intake manifold of the internal combustion engine according to claim 4, wherein at least the inner wall surface of the pipe is formed of a corrosion-resistant metal material.

  When the exhaust gas passes through the exhaust introduction passage by an oxidizing substance such as NOx mixed in the exhaust gas, the surface of the passage, that is, the inner wall surface of the pipe may be oxidized and the pipe may be corroded. In that respect, according to the same configuration, since the pipe has at least an inner wall surface formed of a corrosion-resistant metal material, the occurrence of such corrosion can be suppressed.

  According to a seventh aspect of the present invention, in the resin intake manifold of the internal combustion engine according to any one of the first to sixth aspects, the outlet port is configured so that the amount of exhaust gas discharged from the outlet ports is equal. The gist is that the caliber of each is set to a different size.

  If the derivation ports have the same diameter, the amount of exhaust discharged from each derivation port becomes different, and the amount of exhaust introduced into each cylinder may vary. In that respect, according to the same configuration, since the caliber of each derivation port is set so that the amount of exhaust discharged from each derivation port becomes equal, variation in the amount of exhaust introduced into each cylinder Can be suitably suppressed.

  The invention according to claim 8 is the resin intake manifold of the internal combustion engine according to any one of claims 1 to 7, wherein the exhaust introduction passage is an entire circumference of a joint portion between the upper member and the lower member. The exhaust gas passage is provided with an opening / closing valve whose opening degree can be adjusted.

  According to this configuration, the flow state of the exhaust gas introduced from the introduction port into the exhaust introduction passage can be controlled by adjusting the opening degree of the on-off valve. By controlling the flow state of the exhaust gas in the exhaust introduction passage in this way, it is possible to suitably suppress variation in the amount of exhaust gas introduced into each cylinder from the outlet port via the communication portion.

(First embodiment)
Hereinafter, an embodiment of a resin intake manifold (hereinafter simply referred to as “intake manifold”) of an internal combustion engine according to the present invention will be described with reference to FIGS. FIG. 1 shows a perspective view of an intake manifold in the present embodiment. As shown in FIG. 1, the intake manifold has four communication portions 22a to 22d communicating with each cylinder, and an intake air intake 51 provided in a side protruding manner.

  FIG. 2 is an exploded perspective view of the intake manifold. As shown in FIG. 2, the intake manifold includes a plurality of divided members, that is, an upper member 11, a lower member 12, and an annular spacer 13. The upper member 11 constitutes the upper part of the communication parts 22a to 22d, and the lower member 12 constitutes the lower part of the communication parts 22a to 22d. A spacer 13 is interposed between the upper member 11 and the lower member 12. As described above, the upper member 11 and the lower member 12 are joined to each other via the spacer 13, so that the communication portions 22 a to 22 d are partitioned.

  These three members, that is, the upper member 11, the lower member 12, and the spacer 13 are sequentially overlapped as shown in FIG. 1, and their peripheral portions are joined together by vibration welding to be integrated. The upper member 11 and the lower member 12 are formed by injection molding a synthetic resin, and the spacer 13 is formed by injection molding a heat resistant resin.

Next, the structure of the spacer 13 will be described with reference to FIGS.
FIG. 3 shows a cross-sectional view of the spacer 13 disposed along the joint surface between the upper member 11 and the lower member 12.

  As shown in FIG. 3, an exhaust introduction passage 15 extending along the joint surface of the upper member 11 and the lower member 12 is formed in the spacer 13 so as to form an annular shape over the entire circumference of the joint surface. Has been. Further, as shown in FIG. 4 which is a DD cross section of FIG. 3 and FIG. 5B which is a BB cross section of FIG. 3, the exhaust introduction passage 15 has a substantially rectangular cross section. There is no.

  As shown in FIG. 3, on the joint surface between the upper member 11 and the lower member 12, the spacer 13 is formed with a hollow protruding portion 26 partially protruding sideways. FIG. 5C shows a cross section taken along the line CC in FIG. 3, that is, a cross sectional structure of the protruding portion 26. As shown in FIG. 5C, an exhaust introduction pipe 31 connected to the exhaust passage is connected to the protruding portion 26. Part of the exhaust gas in the exhaust passage is introduced from the exhaust introduction pipe 31 into the exhaust introduction passage 15 through the inside of the protruding portion 26, that is, through the introduction port 25.

  Further, as shown in FIG. 3, in the exhaust introduction passage 15, outlet ports 27a to 27d for distributing the exhaust introduced from the introduction port 25 are connected to the communication portions 22a to 22d corresponding to the respective cylinders. They are formed at the upper center of the joints 23a to 23d with the cylinder.

  FIG. 5A is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 5A, these lead-out ports 27 a to 27 d all have the same diameter and are formed to open inside the intake manifold of the spacer 13.

  Thus, since the outlet ports 27a to 27d are provided for the communication portions 22a to 22d, the exhaust gas introduced into the exhaust gas introduction passage 15 through the introduction port 25 can be appropriately distributed to each cylinder. become.

The exhaust introduction passage 15 is provided with an on-off valve 32 whose opening degree can be adjusted.
Hereinafter, the operation mode of the on-off valve 32 will be described. The opening degree of the on-off valve 32 is adjusted by the driving device 33 based on the engine operating state. Specifically, the engine rotation speed and the engine load are set so that the exhaust amounts discharged from the outlet ports 27a to 27d to the communication portions 22a to 22d are approximately equal under a predetermined engine rotation speed and engine load. The opening degree of the on-off valve 32 corresponding to is calculated, and the relationship between the engine speed, the engine load, and the opening degree of the on-off valve 32 is mapped in advance. Here, by referring to the map, the opening degree of the on-off valve 32 is obtained based on the engine speed and the engine load. And by setting the opening degree of the on-off valve 32 in this way, it becomes possible to suitably suppress variations in the amount of exhaust discharged from the outlet ports 27a to 27d and introduced into each cylinder.

According to the embodiment described above, the following effects can be obtained.
(1) Exhaust gas introduced into the exhaust introduction passage 15 through the introduction port 25 is led out to the communication portions 22a to 22d from the lead-out ports 27a to 27d, and then introduced into the corresponding cylinders. Therefore, the exhaust can be appropriately distributed to each cylinder, and it is possible to avoid the occurrence of variation in the amount of exhaust introduced into each cylinder.

  (2) The exhaust introduction passage 15 is previously formed in the spacer 13 and the spacer 13 is interposed between the upper member 11 and the lower member 12, so that the exhaust introduction passage 15 is connected to the upper member 11 and the lower member 12. It can be easily interposed between the joint surfaces.

  (3) Since the temperature of the exhaust gas recirculated is higher than the temperature at which the synthetic resin reaches thermal deformation, the spacer 13 having the exhaust introduction passage 15 may be thermally deformed. In the present embodiment, since the spacer 13 is formed of a heat resistant resin, deformation due to exhaust heat can be suppressed.

  (4) By adjusting the opening degree of the on-off valve 32, the flow state of the exhaust gas introduced from the introduction port 25 into the exhaust introduction passage 15 can be controlled. Then, by controlling the flow state of the exhaust gas in the exhaust introduction passage 15 in this way, it is possible to suitably suppress variation in the amount of exhaust gas introduced into each cylinder from the outlet ports 27a to 27d via the communication portions 22a to 22d. Will be able to.

(Second Embodiment)
Next, an intake manifold according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same number is attached | subjected to the member equivalent to 1st Embodiment, and the description is abbreviate | omitted.

FIG. 6 shows a cross-sectional view along the joint surface between the upper member 11 and the lower member 12.
As shown in FIG. 7 which is a cross-sectional view taken along the line HH in FIGS. 6 and 6, the intake manifold according to this embodiment has a peripheral portion of the resin upper member 11 and the resin lower member 12 formed by vibration welding. They are joined together and formed integrally. A recess 40 is formed on the inner wall of the joint surface between the upper member 11 and the lower member 12 over the entire circumference of the joint, and a pipe 41 having the inside as an exhaust introduction passage 17 is fitted into the recess 40. Yes. The pipe 41 is integrally welded when the upper member 11 and the lower member 12 are bonded and joined, and is provided so as to form an annular shape over the entire circumference of the joining surface.

  Further, as shown in FIG. 7 which is a HH cross section of FIG. 6 and FIG. 8B which is a FF cross section of FIG. 6, the pipe 41 has an outer diameter extending in the direction of the same joint surface. It is composed of a deformed pipe smaller than the outer diameter in the direction orthogonal to the surface. The pipe 41 is formed of a metal material whose inner wall surface is processed with a corrosion-resistant metal material, specifically, stainless steel.

Next, the details of the pipe 41 will be described.
As shown in FIG. 6, an exhaust introduction passage 17 extending along the joint surface between the upper member 11 and the lower member 12 is provided inside the pipe 41 so as to form an annular shape over the entire circumference of the pipe 41. ing. Further, as shown in FIG. 7 which is an HH cross-sectional view of FIG. 6 and FIG. 8B which is a FF cross-sectional view of FIG. The outer diameter of the cross section extending in the direction of the joint surface is an ellipse that is smaller than the outer diameter in the direction orthogonal to the joint surface.

  As shown in FIG. 6, in the joint surface between the upper member 11 and the lower member 12, the pipe 41 is formed with a hollow projecting portion 42 with a part projecting sideways. The protruding portion 42 is provided between the joint surfaces of the upper member 11 and the lower member 12. FIG. 8C shows a cross section taken along the line G-G in FIG. 6, that is, a cross sectional structure of the protrusion 42. As shown in FIG. 8C, the exhaust pipe 31 connected to the exhaust passage is connected to the projecting portion 42. Part of the exhaust gas in the exhaust passage is introduced from the exhaust introduction pipe 31 into the exhaust introduction passage 17 through the inside of the protruding portion 26, that is, through the introduction port 43.

  Further, as shown in FIG. 6, in the exhaust introduction passage 17, lead ports 34a to 34d for leading the exhaust gas introduced from the introduction port 43 are connected to the communication portions 22a to 22d corresponding to each cylinder and each cylinder. Are formed at the upper center of the joints 23a to 23d.

  Fig.8 (a) is the EE cross section of FIG. As shown in FIG. 8A, these outlet ports 34a to 34d are formed so that the inside of the intake hold of the pipe 41 is opened.

  As described above, since the outlet ports 34a to 34d are provided for the communication portions 22a to 22d, the exhaust gas introduced into the exhaust gas introduction passage 17 of the pipe 41 through the introduction port 43 is appropriately distributed to each cylinder. Will be able to.

  An opening / closing valve 32 whose opening degree can be adjusted is provided in a part of the exhaust introduction passage 17. The operation mode of the on-off valve 32 is the same as the operation mode of the on-off valve 32 in the first embodiment described above.

According to this embodiment described above, in addition to the effect according to (4) shown in the first embodiment, the following effects can be obtained.
(5) The exhaust gas introduced into the exhaust gas introduction passage 17 of the pipe 41 through the introduction port 43 is led out from the lead-out ports 34a to 34d formed in the pipe 41, and then introduced into the corresponding cylinders. Become. Therefore, exhaust can be appropriately distributed to each cylinder.

  (6) Since the temperature of the exhaust gas recirculated is higher than the temperature at which the synthetic resin is thermally deformed, the pipe 41 having the exhaust introduction passage 17 may be thermally deformed. In this respect, in the present embodiment, since the pipe 41 is formed of a heat resistant resin, it is possible to suppress thermal deformation.

  (7) When exhaust passes through the exhaust introduction passage 17 by an oxidizing substance such as NOx mixed in the exhaust, the surface of the exhaust introduction passage 17, that is, the inner wall surface of the pipe 41 is oxidized, and the pipe 41 There is a risk of corrosion. In this respect, in the present embodiment, since at least the inner wall surface of the pipe 41 is formed of a corrosion-resistant metal material, the occurrence of such corrosion can be suppressed.

In addition, embodiment described above can also be implemented in the following aspects.
In each of the above embodiments, all the outlet ports 27a to 27d have the same diameter, but the present embodiment is not limited to this. For example, as shown in FIG. 9, the diameters of the outlet ports 27a to 27d may be set to different sizes so that the amounts of exhaust gas discharged from the outlet ports 27a to 27d are equal. In the present embodiment, when the exhaust amount to be introduced is small, the lead-out port 27d where the pressure of the exhaust becomes low has the largest diameter and is provided near the lead-in port 25 so that the exhaust pressure is high. The aperture is set so as to be smaller.

  If the derivation ports 27a to 27d have the same diameter, the amount of exhaust discharged from the derivation ports 27a to 27d differs, and the amount of exhaust introduced into each cylinder may vary. In that respect, according to the present embodiment, the caliber of each of the derivation ports 27a to 27d is set so that the amount of exhaust discharged from the derivation ports 27a to 27d is equal, so that it is introduced into each cylinder. Variations in the amount of exhaust gas can be suitably suppressed. In addition, since the variation of the amount of exhaust gas introduced into each cylinder can be suppressed by setting the caliber of each of the outlet ports 27a to 27d in this way, in the present modification, the on-off valve 32 described above is used. And the structure which omitted the drive device 33 is employable.

  In each of the above embodiments, the lead-out ports 27a to 27d are formed so as to be positioned at the upper center of the communication portions 22a to 22d and the joint portions 23a to 23d of each cylinder. The present embodiment is not limited to this, and the derivation ports 27a to 27d may be formed at any position of the communication portions 22a to 22d as long as exhaust is introduced into each cylinder. Also in this embodiment, the effect according to the embodiment can be obtained.

  In each of the above embodiments, the introduction port 25 is provided in the vicinity of the communication portion 22a. However, the present embodiment is not limited to this, and the introduction port 25 and the introduction port 43 are the exhaust introduction passage 15 or the exhaust introduction passage. You may attach in any place of 17.

  In the second embodiment, the pipe 41 can be formed of a heat resistant resin. According to such a configuration, thermal deformation of the pipe 41 due to the heat of the exhaust can be suppressed.

In the above embodiment, one on-off valve 32 is provided. However, the present embodiment is not limited to this, and a plurality of on-off valves 32 may be provided.
In each of the above embodiments, the on-off valve 32 and its driving device 33 are provided. However, when the variation in the amount of exhaust gas derived from the outlet ports 27a to 27d is small enough to be ignored, these are omitted. be able to.

The perspective view of the resin-made intake manifolds concerning this embodiment. The disassembled perspective view of the resin-made intake manifolds concerning 1st Embodiment. Sectional drawing of the resin-made intake manifolds and spacers concerning 1st Embodiment. Sectional drawing of the resin-made intake manifolds concerning 1st Embodiment. Sectional drawing of the resin-made intake manifolds concerning 1st Embodiment. Sectional drawing of the resin-made intake manifolds concerning 2nd Embodiment. Sectional drawing of the resin-made intake manifolds concerning 2nd Embodiment. Sectional drawing of the resin-made intake manifolds concerning 2nd Embodiment. Sectional drawing of the resin-made intake manifold concerning other modifications.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Upper member, 12 ... Lower member, 13 ... Spacer, 15 ... Exhaust introduction passage, 17 ... Exhaust introduction passage, 22a, 22b, 22c, 22d ... Communication part, 23a, 23b, 23c, 23d ... Joint part, 25... Introduction port, 26... Projection, 27 a, 27 b, 27 c and 27 d... Derivation port, 31... Exhaust introduction pipe, 32 ... Opening and closing valve, 33 ... Drive device, 34 a, 34 b, 34 c, 34 d. ... Recess, 41 ... Pipe, 42 ... Projection, 43 ... Introduction port, 51 ... Intake air intake

Claims (8)

Provided in an intake system of an internal combustion engine having a plurality of cylinders and having an exhaust gas recirculation device that recirculates exhaust gas discharged from the cylinders into an exhaust passage to the cylinders, and a resin upper member and a resin lower member In the resin intake manifold of the internal combustion engine in which a plurality of communication portions communicated with each cylinder of the internal combustion engine are formed by joining,
An exhaust introduction passage extending between the joint surfaces of the upper member and the lower member and extending along the joint surface;
An introduction port that communicates with the exhaust introduction passage and introduces exhaust gas from the exhaust passage into the exhaust introduction passage;
A resin intake manifold for an internal combustion engine, wherein a lead-out port is formed which opens at each communication portion and leads out the exhaust gas from the exhaust introduction passage to each communication portion. In the resin intake manifold of the internal combustion engine according to claim 1,
A resin intake manifold for an internal combustion engine, wherein a spacer is interposed between the joint surfaces of the upper member and the lower member, and the exhaust introduction passage is formed in the spacer. The resin intake manifold of the internal combustion engine according to claim 2,
The spacer is made of a heat resistant resin. A resin intake manifold for an internal combustion engine. Provided in an intake system of an internal combustion engine having a plurality of cylinders and having an exhaust gas recirculation device that recirculates exhaust gas discharged from the cylinders into an exhaust passage to the cylinders, and the resin upper member and the resin lower member are mutually connected In the resin intake manifold of the internal combustion engine in which a plurality of communication portions communicated with each cylinder of the internal combustion engine are formed by joining,
A concave portion extending along the joint portion is formed on the inner wall of the joint portion of the upper member and the lower member, and a pipe having an inside as an exhaust introduction passage is fitted into the concave portion. An introduction port that communicates with the exhaust introduction passage and introduces exhaust gas from the exhaust passage to the exhaust introduction passage, and opens at each communication portion, and exhausts the exhaust introduction passage to each communication portion. A resin intake manifold for an internal combustion engine, characterized in that a lead-out port is formed. The resin intake manifold of the internal combustion engine according to claim 4,
The pipe is made of a heat resistant resin. A resin intake manifold for an internal combustion engine. The resin intake manifold of the internal combustion engine according to claim 4,
A pipe intake manifold for an internal combustion engine, wherein at least an inner wall surface of the pipe is formed of a corrosion-resistant metal material. In the resin intake manifold of the internal combustion engine according to any one of claims 1 to 6,
The resin intake manifold is characterized in that the diameter of the outlet port is set to be different from each other so that the amount of exhaust gas discharged from each outlet port becomes equal. In the resin intake manifold of the internal combustion engine according to any one of claims 1 to 7,
The exhaust introduction passage is provided so as to form an annular shape over the entire circumference of the joint portion between the upper member and the lower member, and the exhaust introduction passage is provided with an opening / closing valve whose opening degree can be adjusted. A resin intake manifold for internal combustion engines.

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