JP2021105337A - External gas distribution pipe of internal combustion engine - Google Patents

Abstract

To improve the distribution ratio of an external gas to a plurality of intake pipes with a simple configuration.SOLUTION: In an intake device 1, an external gas distribution pipe 10 distributes an external gas to a plurality of intake pipes 21, 22, 23, which communicate with a plurality of cylinders of odd numbers, respectively. The external gas distribution pipe comprises one introduction part 11 communicating with an external gas supply source, one external gas introduction pipe 12 communicating with the introduction part 11, through which the external gas can flow, a plurality of lead-out parts 13, 14, 15 which lead out the external gas from the external gas introduction pipe 12 to each of the intake pipes 21, 22, 23, a branch part 16 branching from the external gas introduction pipe 12 to two lead-out parts 13, 14 of the lead-out parts 13, 14, 15, and a distribution part 17 distributing from the external gas introduction pipe 12 to one lead-out part 15.SELECTED DRAWING: Figure 1

Description

The present invention relates to an external gas distribution pipe of an internal combustion engine.

Conventionally, as an example of external gas distribution piping of an internal combustion engine, an external gas distribution structure that distributes external gas to each cylinder of an internal combustion engine having a number of cylinders that is a multiple of 3 has been known (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2016-89687

In recent years, internal combustion engines are required to reduce the number of cylinders due to the demand for higher efficiency. Due to such demands, in recent years, small displacement internal combustion engines have been used with three cylinders, which is a multiple of three.

Further, in recent years, the internal combustion engine is also required to be miniaturized in its overall configuration. In order to reduce the size of the internal combustion engine, it is also required to reduce the size of the parts used in the internal combustion engine, for example, the distribution pipe for distributing the external gas for EGR (Exhaust Gas Recirculation).

On the other hand, in the case of an internal combustion engine having two or more odd-numbered cylinders such as three cylinders, the distribution ratio is used when the external gas is distributed from one pipe connected to the external gas to the intake pipe of each cylinder. The challenge is to bring them closer together.

However, the external gas distribution structure of Patent Document 1 is an assembly of one after being branched from one main pipe connected to the external gas to two upstream branch pipes in order to improve the distribution ratio of the external gas. After gathering in the pipe, it was distributed to the intake pipe of each cylinder. Therefore, since the external gas distribution structure of Patent Document 1 is particularly large in the reciprocating direction (longitudinal direction) of the piston, which is also the extension direction of the intake pipe, further improvement in miniaturization of the configuration has been required.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an external gas component pipe of an internal combustion engine capable of improving the distribution ratio of external gas to a plurality of intake pipes by a simple configuration. And.

In order to solve the above problems, the external gas distribution pipe of the internal combustion engine according to the present invention distributes the external gas to a plurality of intake pipes that are communicated with each cylinder provided with an odd number of cylinders in the internal combustion engine. One introduction section that is communicated with the external gas supply source, one external gas introduction pipe that is communicated with the introduction section and allows the external gas to flow, and the external gas to be introduced into the external gas. A plurality of outlets that lead out from the pipe to each of the intake pipes, a branch portion that branches from the external gas introduction pipe to two of the outlet pipes, and a branch portion that branches from the external gas introduction pipe to one of the outlet pipes. It is equipped with a distribution unit.

In the external gas distribution pipe of the internal combustion engine according to one aspect of the present invention, the distribution portion is provided at a position closer to the introduction portion than the branch portion in the external gas introduction pipe.

In the external gas distribution pipe of the internal combustion engine according to one aspect of the present invention, the pipe diameter of the branch portion is larger than the pipe diameter of the distribution portion.

In the external gas distribution pipe of the internal combustion engine according to one aspect of the present invention, the external gas introduction pipes are arranged with the arrangement direction of the plurality of intake pipes as the longitudinal direction.

In the external gas distribution pipe of the internal combustion engine according to one aspect of the present invention, the first branch forming a pipeline from the branch portion to the one of the two outlet portions, which is farther from the introduction portion. A pipe and a second branch pipe forming a pipeline from the branch portion to the other lead portion of the two outlet portions are provided, and the length of the first branch pipe is the length of the second branch pipe. Longer than the pipe length.

According to the present invention, it is possible to improve the distribution ratio of the external gas to the plurality of intake pipes by a simple configuration.

It is a top view of the intake apparatus provided with the external gas distribution pipe of the internal combustion engine which concerns on embodiment of this invention. It is a perspective view of the intake apparatus provided with the external gas distribution pipe of the internal combustion engine which concerns on embodiment. It is a front view of the intake apparatus provided with the external gas distribution pipe of the internal combustion engine which concerns on embodiment. It is a top view of the external gas distribution pipe of the internal combustion engine which concerns on embodiment. It is a bottom view of the external gas distribution pipe of the internal combustion engine which concerns on embodiment. It is a schematic diagram for showing the flow of the external gas in the intake apparatus provided with the external gas distribution pipe which concerns on embodiment. It is a top view of the external gas distribution pipe of the internal combustion engine which concerns on the modification of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of an intake device 1 including an external gas distribution pipe 10 according to an embodiment of the present invention. FIG. 2 is a perspective view of the intake device 1 including the external gas distribution pipe 10. FIG. 3 is a front view of the intake device 1 provided with the external gas distribution pipe 10.

Hereinafter, for convenience of explanation, in the intake device 1 shown in FIGS. 1 to 3, the side where the external gas distribution pipe 10 is provided is the front side, and the opposite side is the rear side. In the following description, the longitudinal direction of the external gas distribution pipe 10 of the internal combustion engine is the x-axis direction (left-right direction, width direction), the lateral direction is the y-axis direction (front-rear direction), and is perpendicular to both the x-axis and the y-axis. The direction is the z-axis direction (vertical direction, height direction). In the following description, when the positional relationship and direction of each component are described as right side, left side, front side, rear side, upper side, and lower side, the positional relationship and direction in the drawings are shown to the last, and the actual external gas of the internal combustion engine is shown. It does not limit the positional relationship or direction in the branching pipe.

As shown in FIGS. 1 to 3, in an intake device 1 provided in an internal combustion engine (not shown), external gas is supplied to a plurality of intake pipes 21, 22, 23, which are communicated with cylinders provided with a plurality of odd numbers. One introduction section 11 which is an external gas distribution pipe 10 to be distributed and is communicated with an external gas supply source, and one external gas introduction pipe 12 which is communicated with the introduction section 11 and allows external gas to flow. A plurality of out-licensing units 13, 14, 15 that lead out the external gas from the external gas introduction pipe 12 to the intake pipes 21, 22, 23, respectively, and two out-licensing units 13, 14, 15 from the external gas introduction pipe 12. A branch portion 16 that branches into the portions 13 and 14 and a distribution portion 17 that distributes the gas from the external gas introduction pipe 12 to one lead-out unit 15 are provided. Hereinafter, the external gas distribution pipe 10 of the internal combustion engine according to the present embodiment will be specifically described.

The intake device 1 includes an external gas distribution pipe 10 as described above. The intake device 1 is configured to be mounted on, for example, an in-line 3-cylinder engine (hereinafter, referred to as an engine) as a gasoline engine (not shown). The three cylinders as an example of the odd number of multiple cylinders of the engine are arranged in the x-axis in the order of the first cylinder, the second cylinder, and the third cylinder from the right side to the left side (+ x-axis direction) of the paper in FIG. They are lined up in a row along. Further, the intake device 1 constitutes a part of an intake system that supplies air to the engine. The intake device 1 includes an intake pipe 21 for the first cylinder, an intake pipe 22 for the second cylinder, an intake pipe 23 for the third cylinder, and an air cleaner (not shown) in which the intake pipes 21, 22, and 23 are assembled. It is provided with an intake device main body 20 having a collecting pipe portion 24 connected to the above.

The intake device main body 20 constitutes an upper pipe portion 25 constituting an upper front portion of the intake pipes 21, 22, 23, a lower front portion of the intake pipes 21, 22, 23, and a collecting pipe portion 24. It is composed of a lower pipe portion 26, an intake pipe 21, 22, 23, and a rear pipe portion 27 constituting a rear portion of the collecting pipe portion 24. The intake device main body 20 is formed by joining, for example, a resin upper pipe portion 25, a lower pipe portion 26, and a rear pipe portion 27. The upper pipe portion 25 and the lower pipe portion 26 are joined by a joint portion 28 provided near the central portion in the vertical direction of the intake device main body 20. The component configuration of the intake device main body 20 is not limited to the above-mentioned example.

The intake pipe 21 has an opening 211 communicating with the inside of the pipeline as an opening for introducing the external gas from the external gas distribution pipe 10 into the upper pipe portion 25. The intake pipe 22 has an opening 221 communicating with the inside of the pipeline as an opening for introducing the external gas from the external gas distribution pipe 10 into the upper pipe portion 25. The intake pipe 23 has an opening 231 communicating with the inside of the pipeline as an opening for introducing the external gas from the external gas distribution pipe 10 into the upper pipe portion 25.

As shown in FIGS. 1 to 3, the external gas distribution pipe 10 is attached to the upper front side of the intake device main body 20 in the intake device 1. In the external gas distribution pipe 10, the outlet 13 is connected to the opening 211 of the intake pipe 21, the outlet 14 is connected to the opening 221 of the intake pipe 22, and the outlet 15 is connected to the opening 231 of the intake pipe 23. There is.

FIG. 4 is a plan view of the external gas distribution pipe 10. Further, FIG. 5 is a bottom view of the external gas distribution pipe 10.

As shown in FIGS. 4 and 5, as described above, the external gas distribution pipe 10 includes an introduction unit 11, an external gas introduction pipe 12, a lead-out unit 13, 14, 15, a branch unit 16, and a distribution unit 17. I have. The external gas distribution pipe 10 is formed by, for example, joining the upper component 18 constituting the upper portion and the lower component 19 constituting the lower portion, all of which are made of resin.

The introduction unit 11 communicates with the external gas supply source in order to introduce the external gas from an external gas supply source (not shown) into the inside of the external gas distribution pipe 10.

The external gas introduction pipe 12 is a single pipe that connects the introduction unit 11 and the plurality of outlet units 13, 14, and 15. The external gas introduction pipe 12 is arranged so that the arrangement direction of the plurality of intake pipes 21, 22, 23, that is, the left-right direction (x-axis direction) is the longitudinal direction. The external gas introduction pipe 12 is formed in a straight tubular shape or a substantially straight tubular shape. Since the external gas introduction pipe 12 is formed in this way, the external gas introduced from the external gas supply source can be circulated to the intake pipes 21, 22, and 23 of the intake device main body 20.

Three lead-out units 13, 14 and 15 are provided according to the number of cylinders of the engine. As described above, the lead-out portion 13 is connected to the opening 211 of the intake pipe 21, the lead-out portion 14 is connected to the opening 221 of the intake pipe 22, and the lead-out portion 15 is connected to the opening 231 of the intake pipe 23. Since the lead-out units 13, 14 and 15 communicate with the introduction unit 11 via the external gas introduction pipe 12, the external gas is led out from the external gas introduction pipe 12 to the intake pipes 21, 22 and 23, respectively. Can be done.

The branch portion 16 is located at the position farthest from the introduction portion 11 in the external gas introduction pipe 12, specifically, the other end portion 122 on the opposite side (+ x-axis direction side) of the one end portion 121 where the introduction portion 11 is provided. It is provided in. The branch portion 16 has two of the outlet portions 13, 14, 15 from the external gas introduction pipe 12 after the pipeline is bent from the other end 122 of the external gas introduction pipe 12 to the rear side (+ y-axis direction side). , A lead-out unit 13 connected to the intake pipe 21 of the first cylinder, and a lead-out unit 14 connected to the intake pipe 22 of the second cylinder. That is, the branch portion 16 is a so-called tournament pipe that branches from one pipe (external gas introduction pipe 12) and is connected to two pipes (first branch pipe 131 and second branch pipe 141).

The first branch pipe 131 provides a conduit to one of the two lead-out portions 13 and 14 branched from the branch portion 16 which is farther from the introduction portion 11 (distance in the x-axis direction or pipe length). Is forming. In the second branch pipe 141, of the two out-licensing units 13 and 14 branched from the branching unit 16, the other out-licensing unit whose distance from the introduction unit 11 (distance in the x-axis direction or pipe length) is closer than that of the out-licensing unit 13. It forms a conduit to 14. Here, the pipe length L1 of the first branch pipe 131 is longer than the pipe length L2 of the second branch pipe.

The first branch pipe 131 is provided with a bent portion 132 that bends the pipeline in a predetermined direction, for example, in the + y-axis direction, between the branch portion 16 and the lead-out portion 13. Further, the second branch pipe 141 is provided with a bent portion 142 that bends the pipeline in a predetermined direction, for example, in the + y-axis direction, between the branch portion 16 and the lead-out portion 14. Here, the curvature of the bent portion 132 is larger than that of the bent portion 142 (the degree of bending is tight).

The distribution section 17 is provided at a position closer to the introduction section 11 (closer to the −x axis direction) than the branch section 16 in the external gas introduction pipe 12. In the distribution unit 17, a pipeline (splitting pipe 151) is directly distributed from the external gas introduction pipe 12 to the outlet unit 15. The pipe diameter of the distribution portion 17 is larger than the pipe diameter of the branch portion 16. The distribution unit 17 distributes the external gas from one external gas introduction pipe 12 to one of the plurality of out-licensing units 13, 14 and 15.

Next, the operation of the external gas distribution pipe 10 described above will be described.

FIG. 6 is a schematic diagram for showing the flow of external gas in the intake device 1 including the external gas distribution pipe 10 according to the embodiment.

As shown in FIG. 6, in the intake device 1 provided with the external gas distribution pipe 10, the external gas is introduced into the inside of the external gas distribution pipe 10 from the introduction unit 11. The external gas introduced into the external gas distribution pipe 10 passes through the inside of the external gas introduction pipe 12 and is provided from the outlets 13, 14 and 15 corresponding to the plurality of cylinders of the engine to the intake pipe 21. , 22, 23.

Here, the external gas distribution pipe 10 includes a branch portion 16 that branches from the external gas introduction pipe 12 into two out-licensing units 13 and 14, and a distribution unit 17 that distributes to one out-licensing unit 15. In particular, in the external gas distribution pipe 10, the distribution portion 17 is provided at a position closer to the introduction portion 11 than the branch portion 16 in the external gas introduction pipe 12.

With this configuration, the external gas distribution pipe 10 communicates with two out-licensing units 13 and 14 rather than the external gas G3 distributed to the distribution unit 17 communicating with one out-licensing unit 13. It is possible to improve the difference in the distribution ratios of the external gases G1 and G2 distributed to the branch portion 16.

Further, in the external gas distribution pipe 10, the pipe diameter of the branch portion 16 is formed to be larger than the pipe diameter of the distribution portion 17. Therefore, the external gas distribution pipe 10 can improve the difference in the distribution ratios of the external gases G1 and G2 distributed to the branching portions 16 communicating with the two leading portions 13 and 14.

Further, in the external gas distribution pipe 10, since the external gas introduction pipe 12 is arranged in the longitudinal direction in the arrangement direction (horizontal direction, x-axis direction) of the plurality of intake pipes 21, 22, 23, the intake pipe 21, It is possible to prevent the piston from increasing in the reciprocating direction (vertical direction), which is also the extension direction of 22 and 23, and improve the miniaturization of the configuration.

Further, the external gas distribution pipe 10 has a first branch pipe 131 forming a pipeline from the branch portion 16 to one of the lead-out portions 13 which is far from the introduction portion 11 and a pipeline to the other lead-out portion 14. It includes a second branch pipe 141 to be formed. Here, the pipe length of the first branch pipe 131 is longer than the pipe length of the second branch pipe 141. With this configuration, the external gas distribution pipe 10 is simple by improving the distribution ratio to the out-licensing unit 13 which is far from the introduction unit 11 where the distribution ratio of the external gas tends to increase. Depending on the configuration, the distribution ratio of the external gas can be further improved.

As described above, according to the external gas distribution pipe 10 of the internal combustion engine according to the embodiment, it is possible to improve the distribution ratio of the external gas by a simple configuration in an odd number of multi-cylinder engines such as three cylinders. can.

Although the embodiment of the present invention has been described above, the present invention is not limited to the external gas distribution pipes 10 and 10A of the internal combustion engine according to the above embodiment, and is within the scope of the concept and claims of the present invention. Includes all aspects involved. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each configuration in the above embodiment can be appropriately changed depending on the specific usage mode of the present invention.

FIG. 7 is a plan view of the external gas distribution pipe 10A of the internal combustion engine according to the modified example of the embodiment. As shown in FIG. 7, in the modified example of the external gas distribution pipe 10A, unlike the external gas distribution pipe 10 described above, the introduction portion 11A is provided on the left side in the left-right direction (closer to the + x-axis direction), and the branch portion is provided. 16A is provided on the right side in the left-right direction (closer to the −x axis direction). As described above, the external gas distribution pipe 10A has a configuration and arrangement other than the arrangement of the branch portion 16A and the distribution portion 17A with respect to the introduction portion 11A and the external gas introduction pipe 12, and the difference in pipe diameter between the branch portion 16 and the distribution portion 17. Can be changed as appropriate.

1 ... Intake device, 10,10A ... External gas distribution pipe, 11,11A ... Introduction part, 12 ... External gas introduction pipe, 12,12A ... External gas introduction pipe, 13,13A, 14,14A, 15,15A ... Derivation Parts, 16, 16A ... Branch parts, 17, 17A ... Distribution parts, 18 ... Upper parts, 19 ... Lower parts, 20 ... Intake device main body, 21, 22, 23 ... Intake pipes, 24 ... Collecting pipe parts, 25 ... Upper pipe portion 25 ... Upper pipe portion, 26 ... Lower pipe portion, 27 ... Rear pipe portion, 28 ... Joint portion, 121 ... One end portion, 122 ... Other end portion, 131 ... First branch pipe, 141 ... Second Branch pipe, 151 ... Minute pipe

Claims (5)

It is an external gas distribution pipe that distributes external gas to a plurality of intake pipes that are communicated with each cylinder provided with an odd number of cylinders in an internal combustion engine.
One introduction that communicates with an external gas source,
One external gas introduction pipe that communicates with the introduction part and allows the external gas to flow,
A plurality of outlets for leading the external gas from the external gas introduction pipe to each of the intake pipes,
A branching portion that branches from the external gas introduction pipe into two of the out-licensing portions,
A distribution unit that distributes from the external gas introduction pipe to one of the outlet units,
External gas piping for internal combustion engines. The distribution section is provided at a position closer to the introduction section than the branch section in the external gas introduction pipe.
The external gas distribution pipe of the internal combustion engine according to claim 1. The pipe diameter of the branch portion is larger than the pipe diameter of the distribution portion.
The external gas distribution pipe of the internal combustion engine according to claim 1 or 2. The external gas introduction pipe is arranged with the arrangement direction of the plurality of intake pipes as the longitudinal direction.
The external gas distribution pipe for an internal combustion engine according to any one of claims 1 to 3. A first branch pipe forming a pipeline to one of the two lead-out portions, which is farther from the introduction portion, and
A second branch pipe forming a pipeline from the branch portion to the other lead-out portion of the two lead-out portions,
With
The length of the first branch pipe is longer than the length of the second branch pipe.
The external gas distribution pipe for an internal combustion engine according to any one of claims 1 to 4.

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