JP5737020B2 - Intake system exhaust introduction structure - Google Patents

Description

  The present invention introduces exhaust gas from an internal combustion engine into a chamber disposed in an intake system of a multi-cylinder internal combustion engine, and is provided in an intake manifold for each cylinder from an exhaust distribution path for each cylinder arranged and opened in the chamber. The present invention relates to an intake system exhaust introduction structure that introduces exhaust into an intake branch path.

  In an exhaust gas recirculation (EGR) device of an internal combustion engine, exhaust gas is mixed into intake air by supplying the exhaust gas to a surge tank or an intake branch pipe (intake branch path) (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, an EGR chamber is provided in the intake manifold, and exhaust is distributed from the exhaust distribution path of the EGR chamber to each intake branch path. The exhaust distribution path is configured to be connected with an angle with a curved wall surface on both sides of the bottom surface of the exhaust distribution path so as to facilitate the discharge of condensed water condensed with water vapor in the exhaust.

  In Patent Document 2, the exhaust gas is distributed by passing the EGR exhaust passage through the space between the intake branch paths. Condensed water is not particularly considered.

JP 2009-209855 A (pages 10-13, FIGS. 4-6) JP 2009-133264 A (6th to 9th pages, FIGS. 1 to 3)

  Water vapor is contained in the exhaust gas of the internal combustion engine, and condensed water is generated by being cooled in the EGR device. The condensed water initially becomes water droplets and adheres to the inner wall surface of the chamber. However, the condensed water flows according to acceleration of gravity and acceleration / deceleration of a vehicle equipped with an internal combustion engine, and collects in the EGR chamber. As a result, there is a possibility of being biased toward an exhaust distribution path of a specific cylinder. When such a bias occurs, misfiring of a specific one cylinder becomes remarkable.

  In this way, when only one misfire occurs in a plurality of cylinders, for example, four cylinders of an internal combustion engine, and the output is reduced, a low-frequency vibration is generated unlike the case where the whole is in the same misfire state. Depending on the application to which the internal combustion engine is applied, this low frequency vibration may cause resonance of a transaxle or the like in a vehicle internal combustion engine, which may cause a driver to feel uncomfortable.

  Patent Document 1 aims at early discharge of condensed water from the exhaust distribution passage, and does not prevent uneven condensation of the cylinders. Patent Document 2 also aims at uniform distribution of exhaust gas among the cylinders, and cannot prevent the bias of condensed water.

  An object of the present invention is to prevent the condensed water from the EGR device from being biased to a specific cylinder in an intake system of a multi-cylinder internal combustion engine.

In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
The intake system exhaust introduction structure according to claim 1 introduces the exhaust of the internal combustion engine into a chamber disposed in the intake system of the multi-cylinder internal combustion engine, and is arranged from the exhaust distribution path for each cylinder arranged and opened in the chamber. An intake system exhaust introduction structure that introduces exhaust into an intake branch path provided for each cylinder in the intake manifold, and orthogonal to an arrangement direction of the exhaust distribution path in the chamber when the internal combustion engine is mounted on a vehicle An inner wall surface continuously provided upward from a floor surface positioned vertically downward in a cross section of the exhaust gas distribution path includes an exhaust distribution path positioned at the end in the arrangement direction of the exhaust distribution paths and an adjacent exhaust distribution path. the site and the same site in the array direction of the exhaust distribution path between the resistance at the time of condensed water in the direction of arrangement of the exhaust distribution passage provided upright on the inner wall surface so as to be perpendicular to the inner wall surface is moved Wherein the transfer resistance portion is formed comprising.

  When water vapor contained in the exhaust is condensed and adheres to the inner wall of the chamber as condensed water as water droplets, if some acceleration is applied to the internal combustion engine, the water droplets that have adhered to the inner wall of the chamber will move to the inner wall surface corresponding to the acceleration. Flowing. As a result, water droplets collect from the floor surface of the chamber to the upper inner wall surface. If it collects in this way, it will become easier to move on the inner wall surface as an aggregate of condensed water. If such a condensed water aggregate moves in the arrangement direction of the exhaust distribution path due to acceleration, there is a possibility that it will flow into the exhaust distribution path of a specific cylinder in a concentrated manner.

  However, since the movement resistance portion exists on the inner wall surface, the condensed water is difficult to move even if it flows on the inner wall surface in the arrangement direction of the exhaust distribution path. For this reason, it is possible to prevent the condensed water from the EGR device from being biased toward a specific cylinder.

In this regard, the movement resistance portion is formed at a position corresponding to the space between the adjacent exhaust distribution paths on the inner wall surface provided continuously upward from the floor surface. Movement becomes difficult, and it becomes difficult to concentrate on a specific cylinder.

Even exhaust distribution passage is a 3 or more sequences, such as three or four, by disposing the movement resistance portion at a position corresponding to between the exhaust distribution channels, the condensed water to a specific cylinder Unbiased can be prevented.

The intake system exhaust introduction structure according to claim 2, wherein in the intake system exhaust introduction structure according to claim 1, the inner wall surface includes portions between all adjacent exhaust distribution paths and an arrangement of the exhaust distribution paths. The said movement resistance part is formed in the same site | part in a direction, It is characterized by the above-mentioned.
Further, in the intake system exhaust introduction structure according to claim 3, exhaust of the internal combustion engine is introduced into a chamber disposed in the intake system of the multi-cylinder internal combustion engine, and exhaust distribution is performed for each cylinder arranged and opened in the chamber. An intake system exhaust introduction structure for introducing exhaust gas from a road to an intake branch path provided for each cylinder in an intake manifold, wherein the exhaust distribution path is arranged in the chamber when the internal combustion engine is mounted on a vehicle In the inner wall surface continuously provided upward from the floor surface located below in the vertical direction in the cross section orthogonal to the region between the adjacent exhaust distribution passages and the same portion in the arrangement direction of the exhaust distribution passages, A movement resistance portion serving as a resistance when the condensed water moves in the arrangement direction of the exhaust distribution path is formed, and an interval from the movement resistance portion is formed in the arrangement direction of the exhaust distribution path. There are, condensed water in the direction of arrangement of the exhaust distribution channels, characterized in that the secondary transfer resistance portion serving as a resistance when the moving is formed.
In this way, a sub movement resistance part may be formed at an interval in the arrangement direction of the exhaust distribution path with respect to the movement resistance part. This makes it more difficult for the condensed water to move in the arrangement direction of the exhaust distribution path, and can effectively prevent the condensed water from being biased toward the specific cylinder.
The intake system exhaust introduction structure according to claim 4 is the intake system exhaust introduction structure according to claim 3, wherein a portion of the floor surface of the chamber where the auxiliary movement resistance portion is provided on the inner wall surface and the exhaust The secondary movement resistance portion is formed continuously from the inner wall surface at the same portion in the arrangement direction of the distribution path.
Thus, by providing the above-mentioned auxiliary movement resistance part also on the floor surface of the chamber, it is possible to prevent the condensed water from moving on the floor surface in the arrangement direction of the exhaust distribution path. For this reason, it can prevent more reliably that condensed water is biased to a specific cylinder.
In the intake system exhaust introduction structure according to claim 5 , in the intake system exhaust introduction structure according to any one of claims 1 to 4 , the movement resistance portion crosses the arrangement direction of the exhaust distribution path. It is the protrusion formed in the direction to do.

  By providing a protrusion formed in the direction intersecting with the arrangement direction of the exhaust distribution path, it becomes a resistance when the condensed water moves in the arrangement direction of the exhaust distribution path, and the condensed water moves between the exhaust distribution paths. It becomes difficult to do. Thus, it is possible to prevent the condensed water from being biased toward a specific cylinder.

The intake system exhaust introduction structure according to claim 6 is the intake system exhaust introduction structure according to claim 5 , wherein the movement resistance portion is a protrusion formed in a direction orthogonal to the arrangement direction of the exhaust distribution path. It is characterized by being.

  In particular, the protrusions formed in the direction perpendicular to the arrangement direction of the exhaust distribution paths make it difficult to move the condensed water between the exhaust distribution paths. This effectively prevents the condensed water from being biased toward a specific cylinder.

In the intake system exhaust introduction structure according to claim 7 , in the intake system exhaust introduction structure according to any one of claims 1 to 4 , the movement resistance portion is a plurality of protrusions.
Even if the protrusion is formed on the wall surface of the inner wall as the movement resistance portion, the condensed water is difficult to move, and the condensed water can be prevented from being biased to a specific cylinder.

The intake system exhaust introduction structure according to claim 8 is the intake system exhaust introduction structure according to claim 3 or 4 , wherein the movement resistance portion is formed in a direction crossing the arrangement direction of the exhaust distribution path. It is a protrusion, The sub movement resistance part is a protrusion parallel to the movement resistance part, It is characterized by the above-mentioned.

  Thus, by combining the sub-movement resistance portion of the ridge with the movement resistance portion of the ridge, the movement of the condensed water in the arrangement direction of the exhaust distribution path can be more reliably prevented, and the condensed water is biased to the specific cylinder. It can be effectively prevented.

The intake system exhaust introduction structure according to claim 9 is the intake system exhaust introduction structure according to claim 3 or 4 , wherein the movement resistance portion is formed in a direction intersecting with an arrangement direction of the exhaust distribution path. It is a protrusion, The sub movement resistance part is a protrusion, It is characterized by the above-mentioned.

  In this way, by combining the sub-movement resistance portion of the protrusion with the movement resistance portion of the protrusion, it is possible to more reliably prevent the movement of the condensed water in the direction of arrangement of the exhaust distribution path, and to prevent the condensed water from being biased to a specific cylinder. Can be prevented.

The intake system exhaust introducing structure according to claim 10, in the intake system exhaust introducing structure according to any one of claims 1 to 9, the floor of the front Symbol chamber, the movement resistance section to the inner wall surface The movement resistance portion is continuously formed from the inner wall surface at the same portion in the arrangement direction of the exhaust distribution path and the portion provided with the exhaust distribution path .

  By providing the movement resistance portion on the floor surface of the chamber in this way, it is possible to prevent the condensed water from moving on the floor surface in the arrangement direction of the exhaust distribution paths. For this reason, it can prevent more reliably that condensed water is biased to a specific cylinder.

In the intake system exhaust introduction structure according to claim 11, in the intake system exhaust introduction structure according to any one of claims 1 to 10, the inner wall surface is a ceiling surface of the chamber facing the floor surface. It is characterized by including.

  In this way, by providing the above-described movement resistance portion and the above-described sub movement resistance portion also on the ceiling surface of the chamber, it is possible to prevent the movement of the condensed water in the arrangement direction of the exhaust distribution path also on the ceiling surface. For this reason, it can prevent more reliably that condensed water is biased to a specific cylinder.

It The intake system exhaust introducing structure according to claim 12, in the intake system exhaust introducing structure according to any one of claims 1 to 11, the arrangement direction of the front Symbol exhaust distribution path is a left-right direction of the vehicle It is characterized by.

  In the intake system exhaust introduction structure provided in such an internal combustion engine, condensed water may concentrate on the inner wall surface of the chamber due to the acceleration / deceleration of the vehicle. As described above, the exhaust gas is exhausted by the movement resistance section and the sub movement resistance section. Since it is difficult to move the condensed water in the arrangement direction of the distribution path, it is possible to prevent the condensed water from being biased toward a specific cylinder.

  For this reason, misfire does not occur remarkably only in a specific cylinder, and low-frequency vibration can be prevented. Therefore, the resonance of the vehicle can be prevented and the vehicle driver does not feel uncomfortable.

FIG. 2 is a front view showing the configuration of the main part of the intake manifold of the internal combustion engine of the first embodiment. Similarly rear view. Similarly left side view. Similarly perspective view. XX sectional drawing in FIG. FIG. 4 is a perspective view showing the inside of a third piece according to the first embodiment. FIG. 6 is a perspective view showing the inside of a third piece according to the second embodiment. FIG. 6 is a perspective view showing the inside of a third piece of Embodiment 3.

[Embodiment 1]
<Structure> FIGS. 1 to 4 show a structure of a main part of an intake manifold 2 of an internal combustion engine to which the intake system exhaust introduction structure described above is applied. This internal combustion engine is mounted on a vehicle for vehicle travel.

  The intake manifold 2 includes a surge tank 4 through which intake air is introduced from the throttle valve. An intake branch pipe assembly 6 is provided downstream of the surge tank 4. The surge tank 4 and the intake branch pipe assembly 6 are integrally formed of resin. Incidentally, a through-hole for installing an intake air temperature sensor and the like, various engaging portions for supporting the intake manifold 2 itself, and the like can be provided on the outer peripheral surface.

  Here, the internal combustion engine has four cylinders, and the intake branch pipe assembly 6 includes four intake branch pipes 6a, 6b, 6c, and 6d as intake branch paths. The internal combustion engine may have another number of cylinders. In this case, the intake manifold 2 is provided with intake branch pipes corresponding to the number of cylinders. In the case of a multi-bank internal combustion engine such as a V-type engine, an intake manifold 2 is provided for each bank, and each intake manifold 2 is provided with intake branch pipes corresponding to the number of cylinders in the same bank. Become.

  The intake manifold 2 is formed by joining several pieces together by vibration welding or the like. Here, as shown in the longitudinal cross-sectional configuration of FIG. 5, three pieces 2a, 2b, 2c are integrated by vibration welding. By integrating the three pieces 2a, 2b, and 2c, an EGR chamber 8 is formed below the intake branch pipe assembly 6.

  Exhaust gas is supplied into the EGR chamber 8 from an exhaust gas supply unit 8a formed on one side of the intake branch pipe assembly 6 via an EGR valve provided in the EGR device when exhaust gas recirculation is executed. From the EGR chamber 8, the exhaust is distributed to the intake branch pipes 6 a to 6 d via the exhaust distribution paths 10, 12, 14, and 16.

  In the EGR chamber 8, three ribs 20 (corresponding to a movement resistance portion) are provided on the inner wall surface formed by the third piece 2c. As shown in FIG. 6, these ribs 20 are formed on the inner wall surface of the third piece 2 c at positions corresponding to between the adjacent exhaust distribution paths 10 to 16, and in the arrangement direction of the exhaust distribution paths 10 to 16. On the other hand, it is formed as a protrusion in the orthogonal direction.

Further, in the EGR chamber 8, the floor surface 8c, which is the upper surface of the floor portion 8b, has three ribs 22 (movement resistance) extending to the wall portions between the adjacent exhaust distribution paths 10 to 16 continuously to the ribs 20. Equivalent to the portion).
<Operation> Exhaust gas introduced into the EGR chamber 8 from the exhaust gas supply unit 8a flows in the internal space of the EGR chamber 8 in the direction of arrangement of the exhaust gas distribution paths 10 to 16, and is distributed to the exhaust gas distribution paths 10 to 16 of each cylinder. The During the distribution of the exhaust gas, neither the rib 20 of the third piece 2c nor the rib 22 of the floor portion 8b is high in the internal space of the EGR chamber 8, and does not hinder the even distribution of exhaust gas to each cylinder.

  For example, when the internal combustion engine is in a cold state and the exhaust gas is cooled below the dew point in the EGR chamber 8, condensed water is generated in the EGR chamber 8 and adheres to the inner wall surface of the EGR chamber 8 as water droplets. .

  In particular, since the internal combustion engine is mounted on the vehicle, the water droplets adhering to the inner wall surface are subjected to acceleration in the front-rear direction by starting / stopping or accelerating / decelerating, and also in the lateral direction during turning. When the water droplets attached to the inner wall surface of the EGR chamber 8 receive such acceleration and vibration during traveling, the water droplets collect and the aggregate moves according to the acceleration.

  For example, as shown in FIG. 6, the water droplets adhering to the entire inner wall surface of the EGR chamber 8 move forward in the EGR chamber 8 due to vehicle deceleration or stop, and as shown by the hatching of the broken line in the figure, On the inner wall surface, a water aggregate Dw composed of a large amount of condensed water is formed. If this is the case, the water aggregate Dw is introduced into each cylinder together with the exhaust. Therefore, even if misfire occurs in the internal combustion engine, the misfire is uniform in all cylinders. Therefore, the vibration due to misfire has a high frequency.

  In the state shown in FIG. 6, when lateral acceleration in the left-right direction occurs due to vehicle turning at the same time as deceleration, for example, when the vehicle turns leftward, centrifugal force acts on the water aggregate Dw in the right direction. The water aggregate Dw tends to move to the exhaust distribution path 10 side for the # 1 cylinder at the right end.

  However, on the inner wall surface of the third piece 2c, the rib 20 is formed as a protrusion formed in a direction orthogonal to the arrangement direction of the exhaust distribution passages 10-16 at a position corresponding to between the adjacent exhaust distribution passages 10-16. Is formed.

  For this reason, the water aggregate Dw is prevented from moving in the right direction, and the water in the position corresponding to the exhaust distribution paths 12 to 16 of the other three cylinders is positioned at the position corresponding to the exhaust distribution path 10 of the # 1 cylinder. Concentration of the aggregate Dw is prevented.

  Therefore, even if lateral acceleration occurs in this way, the water aggregate Dw is stopped at a position corresponding to the exhaust distribution passages 10 to 16 of each cylinder, and condensed water concentrates on a specific cylinder, here, the # 1 cylinder. The state where almost no condensed water flows into the three cylinders can be prevented. If the lateral acceleration is in the reverse direction, the water aggregate Dw of the exhaust distribution passages 10 to 14 of the other cylinders tries to move to the exhaust distribution passage 16 of the # 4 cylinder. Condensed water is concentrated on the other three cylinders, so that almost no condensed water flows into the other three cylinders. Therefore, even if misfire occurs in the internal combustion engine, all cylinders are misfired uniformly, and the vibration frequency due to misfire is high.

In addition, the rib 22 is similarly formed in the floor surface 8c of the floor part 8b in the position corresponded between the exhaust distribution paths 10-16 of each cylinder continuously with the rib 20 of the 3rd piece 2c. Therefore, even if condensed water collects on the floor surface 8c of the floor portion 8b, the movement in the lateral direction (the arrangement direction of the exhaust distribution paths 10 to 16) can be prevented. For this reason, even if misfiring occurs in the internal combustion engine due to the condensation of the condensed water only on the floor surface 8c of the floor portion 8b, the misfiring is uniform in all the cylinders, and the vibration due to misfiring has a high frequency.
<Effects> (1) When the water vapor contained in the exhaust gas condenses and adheres to the inner wall surface of the EGR chamber 8 as condensed water as water droplets, as described above, when acceleration to the internal combustion engine occurs due to vehicle acceleration / deceleration or turning, Water droplets in the EGR chamber 8 flow on the inner wall surface and gather on the inner wall surface of the third piece 2c located above the floor portion 8b.

  However, the rib 20 as the movement resistance portion is disposed on the inner wall surface of the EGR chamber 8 at a position corresponding to the space between the adjacent exhaust distribution passages 10 to 16, so that the condensed water is discharged from the exhaust distribution passages 10 to 16. Movement in the arrangement direction becomes difficult. Therefore, it is possible to prevent the condensed water from the EGR device from being biased toward a specific cylinder.

  Thus, a remarkable misfire state does not occur only in a specific cylinder, and low-frequency vibration can be prevented. Therefore, vehicle resonance at a transaxle or the like can be prevented, and the vehicle driver does not feel uncomfortable.

  (2) Further, since the rib 22 is formed continuously on the floor surface 8c of the floor portion 8b on the rib 20 on the third piece 2c side, the condensed water is also discharged on the floor surface 8c. Can be prevented from moving in the direction of arrangement. For this reason, it can prevent more reliably that condensed water is biased to a specific cylinder.

[Embodiment 2]
<Configuration> FIG. 7 shows a third piece 102c of the present embodiment. The third piece 102c is different from the structure of the third piece of the first embodiment, and the other pieces are the same as those of the first embodiment.

  In the third piece 102c, one main rib 120 is provided at a position corresponding to between the exhaust distribution path of the # 1 cylinder and the exhaust distribution path of the # 2 cylinder, and the exhaust distribution path of the # 3 cylinder and the # 4 cylinder Another main rib 122 is provided at a position corresponding to the exhaust distribution path.

  Then, the auxiliary ribs 120a, 120b, 122a, 122b are arranged in the front-rear direction as protrusions parallel to the main ribs 120, 122 at intervals with respect to the main ribs 120, 122 in the arrangement direction of the exhaust distribution passages. Each book is provided. The sub ribs 120a, 120b, 122a, 122b correspond to sub movement resistance portions.

There is no rib at a position corresponding to between the exhaust distribution path of the # 2 cylinder and the exhaust distribution path of the # 3 cylinder.
Incidentally, the floor of the EGR chamber may be provided with the same rib as in the first embodiment, or corresponds to the main rib 120, 122 and the sub rib 120a, 120b, 122a, 122b shown in FIG. The ribs may be formed continuously.
<Operation> When the water droplets adhered to the entire inner wall surface after the exhaust gas is cooled in the EGR chamber move forward during vehicle deceleration, a large amount of water is applied to the inner wall surface of the piece 102c as shown in FIG. 6 of the first embodiment. It becomes a water aggregate consisting of condensed water. Even in the configuration of FIG. 7, as described in the first embodiment, the water aggregate is introduced into each cylinder together with the exhaust gas as it is. Therefore, even if misfiring occurs in the internal combustion engine, the misfiring is evenly performed in all cylinders. Therefore, the vibration due to misfire has a high frequency.

  And if lateral acceleration in the left-right direction occurs due to vehicle turning at the same time as deceleration, for example, if the vehicle turns left and centrifugal force acts on the water assembly in the right direction, the water assembly moves to the right # 1 cylinder side. Try to move.

  However, on the inner wall surface of the piece 102c, main ribs 120, 122 and sub-ribs 120a, 120b, 122a, 122b are formed as protrusions in a direction perpendicular to the arrangement direction of the exhaust distribution passages. Therefore, the water aggregate is prevented from moving in the right direction, and the water aggregate at the position corresponding to the exhaust distribution path of the other three cylinders is concentrated at the position corresponding to the exhaust distribution path of the # 1 cylinder. It is prevented.

  In the present embodiment, there is no rib at a position corresponding to between the exhaust distribution path of the # 2 cylinder and the exhaust distribution path of the # 3 cylinder. For this reason, when turning left, the water aggregate moves from a position corresponding to the exhaust distribution path of the # 3 cylinder to a position corresponding to the exhaust distribution path of the # 2 cylinder. For this reason, in a left turn, misfire is less likely to occur in the # 3 cylinder, misfire is likely to occur in the # 2 cylinder, and an intermediate misfire occurs in the # 1 and # 4 cylinders.

  In this way, there is a difference in the degree of misfire occurrence, but as in the past, misfire in the # 1 cylinder is significant, and other # 2 to # 4 cylinders are not likely to be misfired. There will be no reduction where resonance becomes a problem.

Since the rib (8b: FIG. 5) is also formed in the floor portion (8b: FIG. 5), even if condensed water collects on the floor surface of the floor portion, (Movement in the direction of arrangement) can be prevented. The same applies to the case where ribs are continuously formed on the floor portion of the main ribs 120, 122 and the sub ribs 120a, 120b, 122a, 122b of the piece 102c. As a result, even if misfire occurs in the internal combustion engine due to the condensation of condensed water only at the floor, misfire is almost uniform in all cylinders, and the vibration frequency due to misfire is high.
<Effect> (1) In the piece 102c, it corresponds between the exhaust distribution path of the # 1 cylinder and the exhaust distribution path of the # 2 cylinder, and between the exhaust distribution path of the # 3 cylinder and the exhaust distribution path of the # 4 cylinder. The main ribs 120 and 122 and the sub-ribs 120a, 120b, 122a, and 122b are formed at the positions. For this reason, even if there is no rib between the # 2 cylinder and the # 3 cylinder, the condensed water can be more reliably prevented from concentrating on one cylinder.

This produces the same effect as in the first embodiment.
[Embodiment 3]
<Configuration> FIG. 8 shows a third piece 202c of the present embodiment. The third piece 202c is different from the structure of the third piece of the first embodiment, and the other pieces are the same as those of the first embodiment.

  In the third piece 202c, one rib 220 is provided at a position corresponding to between the exhaust distribution path of the # 1 cylinder and the exhaust distribution path of the # 2 cylinder, and the exhaust distribution path of the # 3 cylinder and the # 4 cylinder Another rib 222 is provided at a position corresponding to the exhaust distribution path.

  Further, four protrusions 220a, 220b, 222a, and 222b are provided in the front and rear as movement resistance portions at intervals with respect to the ribs 220 and 222 in the arrangement direction of the exhaust distribution path. That is, the protrusions 220a, 220b, 222a, and 222b correspond to the sub movement resistance portion.

  Furthermore, there is no rib at the position corresponding to the exhaust distribution path of the # 2 cylinder and the exhaust distribution path of the # 3 cylinder because the internal space is narrow by design, but a total of eight protrusions 224 are provided. The movement resistance portions are arranged in a line in the arrangement direction of the exhaust distribution paths.

Incidentally, the floor of the EGR chamber may be provided with the same rib as in the first embodiment, or corresponds to the main rib 120, 122 and the sub rib 120a, 120b, 122a, 122b shown in FIG. Ribbed ribs may be formed. Alternatively, ribs corresponding to the ribs 220 and 222 in FIG. 8 may be disposed, and ribs or protrusions may be disposed at positions corresponding to the protrusions 220a, 220b, 222a, 222b, and 224. In the case of protrusions, a plurality of rows are arranged in parallel as well as one row.
<Operation> When the water droplets adhered to the entire inner wall surface after the exhaust gas is cooled in the EGR chamber move forward during vehicle deceleration, a large amount of water is applied to the inner wall surface of the piece 202c as shown in FIG. 6 of the first embodiment. It becomes a water aggregate consisting of condensed water. In the configuration of FIG. 8 as well, as described in the first embodiment, the water aggregate is introduced into each cylinder together with the exhaust gas as it is. Therefore, even if misfiring occurs in the internal combustion engine, the misfire is evenly applied to all cylinders. Therefore, the vibration due to misfire has a high frequency.

  And if lateral acceleration in the left-right direction occurs due to vehicle turning at the same time as deceleration, for example, if the vehicle turns left and centrifugal force acts on the water assembly in the right direction, the water assembly moves to the right # 1 cylinder side. Try to move.

  However, ribs 220 and 222 are formed on the inner wall surface of the piece 202c as protrusions in a direction perpendicular to the arrangement direction of the exhaust distribution passages, and further, protrusions 220a, 220b, 222a, 222b, and 224 are formed. Therefore, the water aggregate is prevented from moving in the right direction, and the water aggregate at the position corresponding to the exhaust distribution path of the other three cylinders is concentrated at the position corresponding to the exhaust distribution path of the # 1 cylinder. It is prevented.

  In the present embodiment, ribs do not exist at positions corresponding to the exhaust distribution path of the # 2 cylinder and the exhaust distribution path of the # 3 cylinder, but the protrusion 224 exists. Therefore, the water aggregate is difficult to move from the position corresponding to the exhaust distribution path of the # 3 cylinder to the position corresponding to the exhaust distribution path of the # 2 cylinder, and the movement is inhibited. This suppresses the difference in the degree of misfire between the # 2 cylinder and the # 3 cylinder.

Therefore, as in the past, misfire in the # 1 cylinder becomes remarkable, and the other # 2 to # 4 cylinders are not likely to misfire, and the vibration frequency due to misfire is high.
In addition, ribs as in the first embodiment are formed on the floor (8b: FIG. 5), or continuous with the ribs and protrusions of the piece 102c in the second embodiment and the piece 202c in the second embodiment. Since ribs and protrusions are formed, even if condensed water collects on the floor surface of the floor, movement in the lateral direction (arrangement direction of the exhaust distribution path) can be prevented. Therefore, even if misfire occurs in the internal combustion engine due to the condensation of condensed water only at the floor, the misfire is even in all cylinders, and the vibration frequency due to misfire is high.
<Effect> (1) In the piece 202c, it corresponds between the exhaust distribution path of the # 1 cylinder and the exhaust distribution path of the # 2 cylinder, and between the exhaust distribution path of the # 3 cylinder and the exhaust distribution path of the # 4 cylinder. Ribs 220 and 222 and a plurality of protrusions 220a, 220b, 222a, and 222b are formed at the positions where they are formed. Further, a plurality of protrusions 224 are formed at positions corresponding to the exhaust distribution path of the # 2 cylinder and the exhaust distribution path of the # 3 cylinder. For this reason, even if there is no rib between the exhaust distribution path of the # 2 cylinder and the exhaust distribution path of the # 3 cylinder, the condensed water can be more reliably prevented from concentrating on one cylinder.

This produces the same effect as in the first embodiment.
[Other embodiments]
In each of the above embodiments, the ribs and protrusions are formed on the floor surface of the EGR chamber in addition to the inner wall surface of the third piece. However, in addition to the floor surface, the EGR chamber shown in FIG. Ribs and protrusions may be formed on the ceiling surface 8d of 8 corresponding to the positions of the ribs and protrusions on the third piece side.

  In each of the above embodiments, the ribs are protrusions formed in a direction perpendicular to the arrangement direction of the exhaust distribution passages. However, the ribs are not orthogonal but may be crossed with respect to the arrangement direction of the exhaust distribution passages. good. This also serves as resistance to the movement of the condensed water, and prevents the condensed water from being biased toward the specific cylinder.

  -Condensed water adhering as water droplets on the inner wall surface of the EGR chamber moves and gathers on the inner wall surface of the third piece that stands up from the floor surface due to acceleration / deceleration of the vehicle. When concentrated on a specific cylinder, the output fluctuation of the internal combustion engine causes vehicle resonance vibration. Therefore, without providing ribs or protrusions on the floor or ceiling surface, ribs 20, 120, 120a, 120b, 122, 122a, 122b, 220, 222 and protrusions 220a, 220b, 222a, as shown in FIGS. Even in an EGR chamber provided with only 222b and 224, it is possible to prevent the condensed water from being biased toward a specific cylinder. As a result, the misfire state in a specific cylinder does not become noticeable, and low-frequency vibrations can be prevented, so that the vehicle can be prevented from resonating and the vehicle driver does not feel uncomfortable.

  2 ... intake manifold, 2a, 2b ... piece, 2c ... third piece, 4 ... surge tank, 6 ... intake branch pipe assembly, 6a, 6b, 6c, 6d ... intake branch pipe, 8 ... EGR chamber, 8a ... exhaust Supply part, 8b ... Floor part, 8c ... Floor surface, 8d ... Ceiling surface, 10, 12, 14, 16 ... Exhaust distribution passage, 20, 22 ... Rib, 102c ... Third piece, 120, 122 ... Main rib, 120a , 120b, 122a, 122b ... secondary rib, 202c ... third piece, 220, 222 ... rib, 220a, 220b, 222a, 222b, 224 ... projection, Dw ... water assembly.

Claims (12)

An intake branch path provided for each cylinder in an intake manifold from an exhaust distribution path for each cylinder, which is arranged in the chamber and opened, into the chamber disposed in the intake system of the multi-cylinder internal combustion engine Intake system exhaust introduction structure that introduces exhaust into
When the internal combustion engine is mounted on a vehicle, the inner wall surface continuously provided upward from the floor surface positioned vertically downward in the cross section orthogonal to the arrangement direction of the exhaust distribution path in the chamber includes The inner wall surface orthogonal to the inner wall surface at a position between the exhaust distribution path located at the end in the arrangement direction of the exhaust distribution path and the adjacent exhaust distribution path and the same position in the arrangement direction of the exhaust distribution path upright and intake system exhaust introduction structure, characterized in that the transfer resistance portion is formed of condensed water is resistance when the moving direction of the arrangement of the exhaust distribution path to. 2. The intake system exhaust introduction structure according to claim 1 , wherein the movement resistance portion is formed on the inner wall surface at a portion between all adjacent exhaust distribution passages and the same portion in the arrangement direction of the exhaust distribution passages. Intake system exhaust introduction structure characterized by that. An intake branch path provided for each cylinder in an intake manifold from an exhaust distribution path for each cylinder, which is arranged in the chamber and opened, into the chamber disposed in the intake system of the multi-cylinder internal combustion engine Intake system exhaust introduction structure that introduces exhaust into
When the internal combustion engine is mounted on a vehicle, adjacent to the inner wall surface continuously provided upward from the floor surface positioned vertically downward in the cross section orthogonal to the arrangement direction of the exhaust distribution passage in the chamber A movement resistance portion serving as a resistance when condensate moves in the arrangement direction of the exhaust distribution path is formed at the same part in the arrangement direction of the exhaust distribution path and the portion between the exhaust distribution paths to be formed, and the exhaust In the arrangement direction of the distribution path, an auxiliary movement resistance part is formed which is spaced from the movement resistance part and serves as a resistance when condensed water moves in the arrangement direction of the exhaust distribution path. Intake system exhaust introduction structure. In the intake system exhaust introducing structure according to claim 3, in the floor of the front Symbol chamber, wherein the same site in the array direction of the site of the sub-transfer resistance portions are provided the exhaust distribution path within said wall, said sub An intake system exhaust introduction structure characterized in that a movement resistance portion is formed continuously from the inner wall surface . The intake system exhaust introduction structure according to any one of claims 1 to 4 , wherein the movement resistance portion is a ridge formed in a direction intersecting with an arrangement direction of the exhaust distribution passages. Intake system exhaust introduction structure. 6. The intake system exhaust introduction structure according to claim 5 , wherein the movement resistance portion is a ridge formed in a direction orthogonal to the arrangement direction of the exhaust distribution passages. The intake system exhaust introduction structure according to any one of claims 1 to 4 , wherein the movement resistance portion is a plurality of protrusions. 5. The intake system exhaust introduction structure according to claim 3 , wherein the movement resistance portion is a protrusion formed in a direction intersecting with an arrangement direction of the exhaust distribution path, and the sub movement resistance portion is the movement. Intake system exhaust introduction structure characterized by a ridge parallel to the resistance portion. 5. The intake system exhaust introduction structure according to claim 3 , wherein the movement resistance portion is a protrusion formed in a direction intersecting with an arrangement direction of the exhaust distribution path, and the sub movement resistance portion is a protrusion. An intake system exhaust introduction structure characterized by being. In the intake system exhaust introducing structure according to any one of claims 1 to 9, the floor of the front Symbol chamber, in the arrangement direction of the exhaust distribution channels and sites where the transfer resistance portion is provided in said wall surface An intake system exhaust introduction structure , wherein the movement resistance portion is formed continuously from the inner wall surface at the same site . The intake system exhaust introduction structure according to any one of claims 1 to 10, wherein the inner wall surface includes a ceiling surface of the chamber facing the floor surface . In the intake system exhaust introducing structure according to any one of claims 1 to 11, the arrangement direction of the front Symbol exhaust dispensing path, intake system exhaust introduction structure, which is a lateral direction of the vehicle.

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