JP2018150874A - Intake pipe structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake pipe structure capable of distributing a gas to intake pipes in a well balanced manner regardless of a load state of an engine.SOLUTION: An intake pipe structure 1 comprises: a surge tank 3; multiple intake pipes 4a-4d of which one end side is connected to the surge tank and which are juxtaposed in a flowing direction of air inside of the surge tank; and a gas introduction pipe 5 which introduces an exhaust gas into the surge tank while being connected to the surge tank in such a manner that its distal end side protrudes inside of the surge tank. The surge tank includes a side face part 3b at an intake-pipe-side, a side face part 3a at an anti-intake- pipe-side, and a side face part 3c at a communication side. On an outer peripheral wall 5a at the distal end side of the gas introduction pipe, an intake pipe side opening 7 that is opened towards the side face part 3b at the intake-pipe-side of the surge tank and an anti-intake-pipe-side opening 8 that is opened towards the side face part 3a at the anti-intake-pipe-side of the surge tank are formed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake pipe structure, and more particularly to an intake pipe structure that distributes gas or exhaust gas containing fuel together with air introduced into a surge tank to a plurality of intake pipes and sends it to an intake side of an engine.

  As a conventional intake pipe structure, for example, as shown in FIGS. 8 and 9, the surge tank 103 in which the air introduction port 102 is formed and the side surface portion 103 b of the surge tank 103 on the downstream side of the air introduction port 102. A plurality of intake pipes 104 a to 104 d that are connected at one end side along the air flow direction in the surge tank 103, and a side surface portion 103 c of the surge tank 103 so that the tip side protrudes into the surge tank 103. An intake pipe structure 101 is proposed that includes a gas introduction pipe 105 that is connected between the air introduction port 102 and one end of the intake pipe 104a on the most upstream side and introduces exhaust gas or the like into the surge tank 103. .

  In the intake pipe structure 101, a front opening 107 that opens toward the upstream side of the air flow direction in the surge tank 103 and an air in the surge tank 103 are formed on the outer peripheral wall 105 a on the distal end side of the gas introduction pipe 105. And a rear opening 108 that opens toward the downstream side in the flow direction. The air introduced from the air inlet 102 into the surge tank 103 is distributed to the intake pipes 104a to 104d together with the gas introduced from the gas introduction pipe 105 and sent to the intake side of the engine.

Japanese Patent Laid-Open No. 11-210562

  However, in the above-described conventional intake pipe structure 101, the front-side opening 107 that opens toward the upstream side in the air flow direction in the surge tank 103 and the surge tank are formed in the outer peripheral wall 105a on the distal end side of the gas introduction pipe 105. 103, the rear opening 108 that opens toward the downstream side in the air flow direction is formed, so that the air and gas are not mixed in the surge tank 103, and the intake pipes 104a to 104d are not mixed. The gas cannot be distributed in a balanced manner. Specifically, when the engine rotates at high speed (that is, when the flow velocity of air flowing through the surge tank 103 is high), the gas tends to flow into the intake pipes 104c and 104d on the back side due to the air flow. On the other hand, when the engine is running at a low speed (that is, when the flow velocity of the air flowing through the surge tank 103 is slow), the gas tends to easily flow into the intake pipes 104a and 104b on the front side because the mass of the gas is large. there were.

  In addition, as a conventional intake pipe structure, the front end side of the gas introduction part is provided with a first blowout port directed to the upstream side of the air flow in the surge tank and a second blowout port directed to the downstream side. Has been proposed that is formed into a branched tubular shape (see, for example, Patent Document 1). However, even with the technique described in Patent Document 1, gas cannot be distributed to each intake pipe in a well-balanced manner depending on the load state of the engine in the same manner as the intake pipe structure 101 described above.

  The present invention has been made in view of the above situation, and an object thereof is to provide an intake pipe structure capable of distributing gas to each intake pipe in a well-balanced manner regardless of the load state of the engine.

In order to solve the above problem, the invention according to claim 1 is characterized in that a surge tank in which an air introduction port is formed, and one end side of the surge tank is connected to the downstream side of the air introduction port so that the inside of the surge tank A plurality of intake pipes arranged side by side along the air flow direction, and the air inlet and one end side of the intake pipe on the most upstream side in the surge tank so that the tip side protrudes into the surge tank. A gas inlet pipe connected to the gas tank for introducing gas containing fuel or exhaust gas into the surge tank, the surge tank on the side of the intake pipe to which the intake pipe is connected The side surface portion, the side portion on the anti-intake pipe side facing the side portion on the intake pipe side, the side portion on the intake pipe side and the side portion on the anti-intake pipe side are connected, and the gas introduction pipe is connected Side of the contact side An intake pipe side opening that opens toward the side surface of the surge tank on the intake pipe side, and a side surface of the surge tank on the side opposite to the intake pipe The gist of the present invention is that an anti-intake pipe side opening that opens toward the portion is formed.
According to a second aspect of the present invention, in the first aspect of the present invention, the outer peripheral wall on the distal end side of the gas introduction pipe is a plane extending through the axis of the gas introduction pipe and extending in the direction in which the intake pipes are arranged. When partitioned into a region and an anti-intake pipe side region, the intake pipe side opening is arranged in the intake pipe side region, and the anti-intake pipe side opening is arranged in the anti-intake pipe side region It is a summary.
According to a third aspect of the present invention, in the second aspect of the present invention, the intake pipe side opening is configured such that the intake pipe side of the surge tank is located in the intake pipe side region of the outer peripheral wall on the distal end side of the gas introduction pipe. The anti-intake pipe side opening is disposed on the side of the anti-intake pipe side of the surge tank in the anti-intake pipe side region of the outer peripheral wall on the distal end side of the gas introduction pipe. The gist is that it is disposed on the side closest to the side surface portion of the.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the intake pipe side opening and the anti-intake pipe side opening have the same opening area. And

According to the intake pipe structure of the present invention, the surge tank includes a side part on the intake pipe side to which the intake pipe is connected, a side part on the side opposite to the intake pipe opposite to the side part on the intake pipe side, and a side face on the intake pipe side. And a side surface portion on the side opposite to the intake pipe side to which the gas introduction pipe is connected, and an outer peripheral wall on the distal end side of the gas introduction pipe is provided on the intake pipe side of the surge tank. An intake pipe side opening that opens toward the side surface and an anti-intake pipe side opening that opens toward the side surface on the anti-intake pipe side of the surge tank are formed. As a result, most of the gas introduced into the surge tank from the opening on the side opposite to the intake pipe is likely to flow into the intake pipe on the back side. Also, most of the gas introduced into the surge tank from the intake pipe side opening is likely to flow into the front intake pipe due to the negative pressure of the intake pipe. Therefore, gas can be distributed to each intake pipe in a well-balanced manner regardless of the engine load state.
Further, when the outer peripheral wall on the front end side of the gas introduction pipe is partitioned into an intake pipe side area and an anti-intake pipe side area by a plane extending through the axis of the gas introduction pipe in the arrangement direction of the intake pipe, When the intake pipe side opening is arranged in the intake pipe side region and the anti-intake pipe side opening is arranged in the anti-intake pipe side region, gas is supplied to each intake pipe in a more balanced manner. Can be distributed.
In addition, the intake pipe side opening is disposed on the intake pipe side region of the outer peripheral wall on the distal end side of the gas introduction pipe on the side closest to the side surface portion on the intake pipe side of the surge tank, When the intake pipe side opening is disposed on the side closest to the side part on the anti-intake pipe side of the surge tank in the anti-intake pipe side region of the outer peripheral wall on the distal end side of the gas introduction pipe, Gas can be distributed in a more balanced manner to the intake pipe.
Further, when the intake pipe side opening and the anti-intake pipe side opening have the same opening area, gas can be distributed to each intake pipe in a more balanced manner.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a perspective view of the intake pipe structure which concerns on an Example. It is the principal part perspective view seen from the air inlet side of the surge tank in the said intake pipe structure. It is the III-III sectional view taken on the line of FIG. It is explanatory drawing for demonstrating the exhaust-gas introduction pipe | tube which concerns on an Example, (a) shows a top view, (b) shows a bottom view. It is explanatory drawing for demonstrating the said exhaust gas introduction pipe | tube, (a) shows the a arrow enlarged view of FIG. 4, (b) shows the bb sectional view enlarged view of FIG. It is explanatory drawing for demonstrating the exhaust-gas introduction pipe | tube which concerns on another form, (a) shows a form provided with a some intake pipe side opening part and a some anti-intake pipe side opening part, (b) is A form provided with a plurality of intake pipe side openings is shown, and (c) shows a form provided with a plurality of anti-intake pipe side openings. It is explanatory drawing for demonstrating the exhaust-gas introduction pipe | tube which concerns on another another form, (a) shows the form provided with the intake pipe side opening part with a larger opening area than an anti-intake pipe side opening part, (b) ) Shows an embodiment provided with an anti-intake pipe side opening having a larger opening area than the intake pipe side opening, and (c) is an intake pipe formed on the downstream side in the air flow direction of the outer peripheral wall of the exhaust gas introduction pipe. The form provided with a side and an anti-intake pipe side opening part is shown. It is a principal part longitudinal cross-sectional view of the conventional intake pipe structure. It is the principal part perspective view seen from the air inlet side of the surge tank in the said conventional intake pipe structure.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Intake pipe structure>
The intake pipe structure according to the present embodiment includes a surge tank (3) in which an air introduction port (2) is formed, and one end side connected to the downstream side of the air introduction port in the surge tank so that air flows in the surge tank. A plurality of intake pipes (4a to 4d) arranged side by side in the direction and one end of the air inlet (2) and the most upstream side intake pipe (4a) in the surge tank so that the tip side protrudes into the surge tank An intake pipe structure (1) including a gas introduction pipe (5) connected between the gas supply pipe and a gas containing fuel or exhaust gas in the surge tank (see, for example, FIGS. 1 to 3) ). The surge tank (3) includes a side surface portion (3b) on the intake pipe side to which the intake pipes (4a to 4d) are connected, and a side surface portion (3a) on the side opposite to the intake pipe facing the side surface portion on the intake pipe side. And a side part (3c) on the communication side that connects the side part on the intake pipe side and the side part on the side opposite to the intake pipe and to which the gas introduction pipe (5) is connected, and the gas introduction pipe (5) The outer peripheral wall (5a) on the front end side of the intake pipe has an intake pipe side opening (7) that opens toward the side surface (3b) on the intake pipe side of the surge tank, and a side surface ( An anti-intake pipe side opening (8) opening toward 3a) is formed (see, for example, FIGS. 4 to 7).

  The “most upstream side intake pipe” is intended to be an intake pipe disposed at a position closest to the air inlet among the plurality of intake pipes. The shape, material, etc. of the surge tank are not particularly limited. Further, the number, shape, material and the like of the intake pipe are not particularly limited. The shape, material, gas type, etc. of the gas introduction pipe are not particularly limited. Further, the number of openings, the opening amount, the arrangement location, etc. are not particularly limited.

  As an intake pipe structure according to the present embodiment, for example, a plane (P1) passing through the axis (C1) of the gas introduction pipe (5) and extending in the direction (Q) of the intake pipe is disposed on the tip side of the gas introduction pipe. When the outer peripheral wall (5a) is partitioned into the intake pipe side area (A1) and the anti-intake pipe side area (A2), the intake pipe side opening (7) is disposed in the intake pipe side area (A1). In addition, the anti-intake pipe side opening (8) can be in the form of being disposed in the anti-intake pipe side region (A2) (see, for example, FIGS. 5 to 7).

  In the case of the above-described embodiment, for example, the intake pipe side opening (7) is formed on the intake pipe side region (A1) of the outer peripheral wall (5a) on the distal end side of the gas introduction pipe (5) on the intake pipe side of the surge tank. It is arrange | positioned at the side nearest to a side part (3b), and an anti-intake pipe side opening part (8) is the anti-intake pipe side area | region (A2) of the outer peripheral wall (5a) of the front end side of a gas introduction pipe (5). In FIG. 4, a configuration (for example, see FIG. 4 and FIG. 5) arranged on the side closest to the side surface portion (3a) on the anti-intake pipe side of the surge tank can be given.

  As the intake pipe structure according to this embodiment, for example, the intake pipe side opening (7) and the anti-intake pipe side opening (8) have the same opening area (S) (for example, FIG. For example, see FIG. The “same opening area” is intended to have substantially the same opening area, and the openings of the intake pipe side opening and the anti-intake pipe side opening are other than the form in which the opening areas of the respective openings are completely matched. A mode in which the difference in area is within ± 5% of the opening area of the intake pipe side opening is also included. Further, the “opening area” means a total opening area of a plurality of openings when a plurality of openings are provided.

  As an intake pipe structure according to the present embodiment, for example, an intake pipe between the axis (C1) of the gas introduction pipe (5) and the center (C2) of the opening on one end side of the intake pipe (4a) on the most upstream side. The space | interval (L) along the arrangement direction (Q) of 75-105mm (preferably 80-100mm, especially 85-95mm) can mention the form (for example, refer FIG. 3 etc.). As a result, the gas can be distributed to each intake pipe in a more balanced manner, and the surge tank can be miniaturized.

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

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, as an “intake pipe structure” according to the present invention, an intake pipe structure (also referred to as “intake manifold”) used in a four-cylinder engine is illustrated.

(1) Configuration of Intake Pipe Structure As shown in FIGS. 1 to 3, the intake pipe structure 1 according to this embodiment includes a surge tank 3 in which an air introduction port 2 is formed, and an air introduction port 2 in the surge tank 3. A plurality of (four in the figure) intake pipes 4a to 4d that are connected at one end side to the downstream side of the surge tank 3 along the direction of air flow in the surge tank 3, and the tip side protrudes into the surge tank 3. In addition, the surge tank 3 includes an exhaust gas introduction pipe 5 that is connected between the air introduction port 2 and one end of the intake pipe 4 a on the most upstream side and introduces exhaust gas into the surge tank 3.

  The surge tank 3 includes a side surface portion 3b on the intake pipe side to which the intake pipes 4a to 4d are connected, a side surface portion 3b on the side opposite to the side surface portion 3b, and a side surface portion 3a and a side surface portion 3b. And a communication side surface portion 3c to which the exhaust gas introduction pipe 5 is connected. The surge tank 3 is formed in a long box shape, and an air inlet 2 for introducing air into the surge tank 3 is formed on one end side in the longitudinal direction. The air flow direction in the surge tank 3 (that is, the intake pipe arrangement direction Q) is a direction from the air inlet 2 on one end side toward the other end side. The facing direction between the side surface portion 3a and the side surface portion 3b of the surge tank 3 is defined as a vertical direction P.

  As shown in FIGS. 4 and 5, the exhaust gas introduction pipe 5 includes a cylindrical outer peripheral wall 5 a and a blocking wall 5 b that is connected to the distal end side of the outer peripheral wall 5 a and closes the shaft end side. The outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5 has an intake pipe side opening 7 opening toward the side face 3b on the intake pipe side of the surge tank 3, and a side face on the side opposite to the intake pipe of the surge tank 3 An anti-intake pipe side opening 8 that opens toward the portion 3a is formed.

  Here, as shown in FIG. 5, the outer peripheral wall 5a on the front end side of the exhaust gas introduction pipe 5 on the plane P1 passing through the axis C1 of the exhaust gas introduction pipe 5 and extending in the intake pipe arrangement direction Q is taken into the intake pipe side region A1. And the anti-intake pipe side area A2, the intake pipe side opening 7 is arranged in the intake pipe side area A1, and the anti intake pipe side opening 8 is arranged in the anti intake pipe side area A2. Has been. The intake pipe side region A1 is formed in a semi-cylindrical shape that protrudes toward the side face portion 3b of the surge tank 3 on the intake pipe side. The anti-intake pipe side region A2 is formed in a semi-cylindrical shape that protrudes toward the side part 3a of the surge tank 3 on the anti-intake pipe side.

  Specifically, the intake pipe side opening 7 is disposed on the side closest to the side surface portion 3b on the intake pipe side of the surge tank 3 in the intake pipe side region A1 of the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5. ing. In other words, the intake pipe side opening 7 is disposed on the center side (that is, the apex side) in the arc direction in the intake pipe side region A1 of the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5. Further, the anti-intake pipe side opening 8 is arranged on the side closest to the side part 3 a on the anti-intake pipe side of the surge tank 3 in the anti-intake pipe side region A2 of the outer peripheral wall 5 a on the distal end side of the exhaust gas introduction pipe 5. ing. In other words, the anti-intake pipe side opening 8 is disposed on the center side (that is, the apex side) in the arc direction in the anti-intake pipe side region A2 of the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5.

  Each opening of the intake pipe side opening 7 and the anti-intake pipe side opening 8 is formed in a substantially rectangular plane. The intake pipe side opening 7 and the anti-intake pipe side opening 8 have substantially the same opening area S. Further, the intake pipe alignment direction Q between the axial center C1 of the exhaust gas introduction pipe 5 and the center C2 of the opening on the one end side of the intake pipe 4a on the most upstream side (that is, the center C2 of the alignment direction Q of the intake pipe of the opening). The distance L along the line is about 90 mm (see FIG. 3).

(2) Action of Intake Pipe Structure Next, the action of the intake pipe structure 1 having the above configuration will be described. When the engine is operating, as shown in FIG. 3, the exhaust gas introduced into the surge tank 3 from the exhaust gas introduction pipe 5 together with the air introduced into the surge tank 3 from the air inlet 2 (indicated by phantom arrows). Gas (indicated by broken line arrows) is distributed to the intake pipes 4a to 4d and supplied to the intake side of the engine. At this time, even when the engine is running at a low speed, most of the exhaust gas introduced into the surge tank 3 from the opening 8 on the side opposite to the intake pipe of the exhaust gas introduction pipe 5 passes through the intake pipes 4a and 4b on the front side. It becomes easy to flow into the intake pipes 4c and 4d on the back side so as to jump. On the other hand, even when the engine is rotating at high speed, most of the exhaust gas introduced into the surge tank 3 from the intake pipe side opening 7 of the exhaust gas introduction pipe 5 is caused by the negative pressure of the intake pipe. It becomes easy to flow into 4a, 4b. As described above, a part of the exhaust gas is recirculated to the intake side of the engine, thereby reducing nitrogen oxides in the exhaust gas and improving fuel efficiency.

(3) Effects of the Embodiment According to the intake pipe structure 1 of the present embodiment, the surge tank 3 is opposed to the side face portion 3b on the intake pipe side to which the intake pipes 4a to 4d are connected, and the side face portion 3b on the intake pipe side. An anti-intake pipe side surface portion 3a, an intake pipe side surface portion 3b, and an anti-intake pipe side surface portion 3a connected to each other and a gas introduction pipe 5 connected to the side surface portion 3c. In the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5, an intake pipe side opening 7 opening toward the side face 3b on the intake pipe side of the surge tank 3 and a side face on the side opposite to the intake pipe of the surge tank 3 are provided. An anti-intake pipe side opening 8 that opens toward the portion 3a is formed. Thereby, much of the exhaust gas introduced into the surge tank 3 from the anti-intake pipe side opening 8 is likely to flow into the back side intake pipes 4c and 4d. Also, most of the exhaust gas introduced into the surge tank 3 from the intake pipe side opening 7 is likely to flow into the front intake pipes 4a and 4b due to the negative pressure of the intake pipe. Therefore, the exhaust gas can be distributed to each of the intake pipes 4a to 4d in a well-balanced manner regardless of the engine load state.

  Further, in the present embodiment, the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5 on the plane P1 passing through the axis C1 of the exhaust gas introduction pipe 5 and extending in the intake pipe arrangement direction Q is opposite to the intake pipe side region A1. When partitioned into the pipe side area A2, the intake pipe side opening 7 is disposed in the intake pipe side area A1, and the anti-intake pipe side opening 8 is disposed in the anti-intake pipe side area A2. . Thereby, gas can be distributed to each intake pipe 4a-4d in a more balanced manner.

  In the present embodiment, the intake pipe side opening 7 is located on the side closest to the side surface portion 3b on the intake pipe side of the surge tank 3 in the intake pipe side region A1 of the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5. The anti-intake pipe side opening 8 is disposed at a side closest to the side part 3a on the anti-intake pipe side of the surge tank 3 in the anti-intake pipe side region A2 of the outer peripheral wall 5a on the distal end side of the exhaust gas introduction pipe 5. Is arranged. Thereby, gas can be distributed to each intake pipe 4a-4d in a more balanced manner.

  In the present embodiment, the intake pipe side opening 7 and the anti-intake pipe side opening 8 have the same opening area. Thereby, gas can be distributed to each intake pipe 4a-4d in a more balanced manner.

  Further, in this embodiment, the distance L along the arrangement direction Q of the intake pipes between the axis C1 of the exhaust gas introduction pipe 5 and the center C2 of the opening on the one end side of the intake pipe 4a on the most upstream side is 90 mm. As a result, the gas can be distributed to each of the intake pipes 4a to 4d in a more balanced manner, and the surge tank 3 can be downsized.

  Here, in the simulation using a computer, as a first analysis, the distribution state of the exhaust gas to each of the intake pipes 4a to 4d due to the influence of the opening area of each of the openings 7 and 8 was analyzed. Further, as a second analysis, the distribution state of the exhaust gas to each of the intake pipes 4a to 4d due to the influence of the interval L (see FIG. 3) was analyzed.

  In the first analysis, the A1 form in which the openings 7 and 8 have the same opening area S, and the A2 form in which the intake pipe side opening 7 has an opening area approximately 10% larger than the anti-intake pipe side opening 8 (FIG. 7 (a)), and the A3 configuration (see FIG. 7 (b)) in which the opening portion 8 on the anti-intake pipe side has a larger opening area by about 10% than the opening portion 7 on the intake pipe side (see FIG. 7 (b)). 1500 rpm) and at high engine speed (5000 rpm). As a result, when the engine was running at a low speed, there was no noticeable variation in the distribution of the exhaust gas to the intake pipes 4a to 4d in the A1 to A3 configurations. In contrast, when the engine is running at high speed, there is little variation in the distribution of the exhaust gas to the intake pipes 4a to 4d in the A1 form, but in the A2 form, the exhaust gas to the intake pipes 4a and 4b on the front side is small. The distribution of exhaust gas to the intake pipes 4c, 4d on the back side is slightly increased in the A3 form.

  In the second analysis, by changing the connection position in the arrangement direction Q of the intake pipe of the exhaust gas inlet 5 with respect to the surge tank 3, the B1 form in which the interval L is 60 mm, the B2 form in which the interval L is 70 mm, the interval In the B3 form in which L is 80 mm and the B4 form in which the interval L is 90 mm, a comparative study was performed at low engine speed (1500 rpm) and at high engine speed (5000 rpm). As a result, at the time of high engine rotation, in the B1 to B4 configurations, there was no noticeable variation in the distribution of the exhaust gas to the intake pipes 4a to 4d. On the other hand, when the engine is running at a low speed, the variation in the distribution of the exhaust gas to the intake pipes 4a to 4d decreases as the interval L increases.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above embodiment, the gas introduction pipe 5 including one intake pipe side opening 7 and one anti-intake pipe side opening 8 is illustrated, but the present invention is not limited thereto. ) As shown in (b), a gas inlet pipe 5 having a plurality of intake pipe side openings 7 may be used. Further, for example, as shown in FIGS. 6 (a) and 6 (c), a gas introduction pipe 5 having a plurality of anti-intake pipe side openings 8 may be used.

  In the above embodiment, the side surface portion 3b (or the anti-intake pipe) of the surge tank 3 in the intake pipe side region A1 (or the anti-intake pipe side region A2) of the outer peripheral wall 5a on the distal end side of the gas introduction pipe 5 is used. Although the intake pipe side opening 7 (or the anti-intake pipe side opening 8) disposed on the side closest to the side surface portion 3a) is illustrated, the present invention is not limited to this. For example, FIGS. ) And FIG. 7 (c), the intake pipe side opening disposed in the intake pipe side region A1 of the outer peripheral wall 5a on the distal end side of the gas introduction pipe 5 away from the portion closest to the side surface portion 3b. It may be 7. Also, for example, as shown in FIGS. 6A, 6C and 7C, from the portion closest to the side surface portion 3a in the anti-intake pipe side region A2 of the outer peripheral wall 5a on the distal end side of the gas introduction pipe 5. It is good also as the anti-intake pipe side opening part 8 arrange | positioned in the distant place.

  Moreover, in the said Example, although the opening parts 7 and 8 of the same opening area S were illustrated, it is not limited to this, For example, as shown to Fig.7 (a) (b), the opening part 7 of a different opening area is shown. , 8 may be used. 6 and 7, the lengths of the openings 7 and 8 in the axial direction are the same.

  Moreover, in the said Example, although the opening parts 7 and 8 formed only in the outer peripheral wall 5a of the gas introduction pipe 5 were illustrated, it is not limited to this, For example, the outer peripheral wall 5a and the obstruction | occlusion wall 5b of the gas introduction pipe 5 It is good also as an opening formed over.

  Moreover, in the said Example, although the opening parts 7 and 8 which have an opening of a plane substantially rectangular shape were illustrated, it is not limited to this, For example, as an opening part which has openings, such as a plane substantially circular shape, a substantially elliptical shape, and an irregular shape Also good.

  Moreover, in the said Example, although the square cylinder shaped surge tank 3 was illustrated, it is not limited to this, For example, it is good also as a cylindrical or elliptical cylindrical surge tank.

  Further, in the above embodiment, the exhaust gas introduction pipe 5 for introducing the exhaust gas into the surge tank 3 is exemplified, but the present invention is not limited to this. For example, blow-by gas (that is, gas containing fuel) in the surge tank 3. Or a gas introduction tube for introducing fuel vapor (that is, a gas containing fuel) into the surge tank 3. Furthermore, in the said Example, although the form provided with the one gas introduction pipe | tube 5 was illustrated, it is not limited to this, For example, you may make it provide a some gas introduction pipe | tube.

  Furthermore, in the said Example, although the gas introduction pipe | tube 5 which has the cylindrical outer peripheral wall 5a was illustrated, it is not limited to this, For example, it is good also as a gas introduction pipe | tube which has a rectangular tube shape or an elliptical cylinder shape outer peripheral wall. .

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  INDUSTRIAL APPLICABILITY The present invention is widely used as a technique related to an intake pipe structure for introducing gas containing fuel or exhaust gas together with air to the intake side of an engine used in vehicles such as passenger cars, buses, and trucks.

  DESCRIPTION OF SYMBOLS 1; Intake pipe structure, 2; Air inlet, 3; Surge tank, 3a; Side part on the anti-intake pipe side, 3b; Side part on the intake pipe side, 3c; Side part, 4a-4d; Exhaust gas introduction pipe (gas introduction pipe), 5a; outer peripheral wall, 7; intake pipe side opening, 8; anti-intake pipe side opening, A1; intake pipe side area, A2; anti-intake pipe side area, C1; Axial center of gas introduction pipe, C2: center of intake pipe on the most upstream side, P1; plane, Q: arrangement direction of intake pipe, S: opening area of opening.

Claims (4)

A surge tank in which an air introduction port is formed, and a plurality of intake pipes arranged in parallel along the flow direction of air in the surge tank with one end connected downstream of the air introduction port in the surge tank; Gas or exhaust gas containing fuel in the surge tank connected between the air inlet and one end side of the intake pipe on the most upstream side in the surge tank so that the tip side protrudes into the surge tank An intake pipe structure comprising a gas introduction pipe for introducing
The surge tank includes a side portion on the intake pipe side to which the intake pipe is connected, a side portion on the anti-intake pipe side facing the side portion on the intake pipe side, a side portion on the intake pipe side, and the anti-intake air A side part on the communication side that communicates with the side part on the pipe side and to which the gas introduction pipe is connected,
An outer peripheral wall on the distal end side of the gas introduction pipe is directed to an intake pipe side opening portion that opens toward the side surface portion of the surge tank toward the intake pipe side, and toward a side surface portion of the surge tank that is opposite to the intake pipe side. And an intake pipe side opening that is open.   When the outer peripheral wall on the front end side of the gas introduction pipe is partitioned into an intake pipe side region and an anti-intake pipe side region by a plane passing through the axis of the gas introduction pipe and extending in the direction in which the intake pipes are arranged, the intake pipe The intake pipe structure according to claim 1, wherein the side opening is arranged in the intake pipe side region, and the anti-intake pipe side opening is arranged in the anti-intake pipe side region. The intake pipe side opening is disposed on a side closest to the side surface portion of the surge tank on the intake pipe side in the intake pipe side region of the outer peripheral wall on the distal end side of the gas introduction pipe,
The anti-intake pipe side opening is disposed on a side closest to the side part on the anti-intake pipe side of the surge tank in the anti-intake pipe side region of the outer peripheral wall on the distal end side of the gas introduction pipe. 2. The intake pipe structure according to 2.   The intake pipe structure according to any one of claims 1 to 3, wherein the intake pipe side opening and the anti-intake pipe side opening have the same opening area.

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