JP3860955B2 - Purge gas processing apparatus for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a purge gas (evaporated fuel gas, EGR gas, PCV gas, etc.) processing apparatus for an internal combustion engine.
[0002]
[Prior art]
Japanese Utility Model Laid-Open No. 3-23642 discloses an inertia in which an intake path of an internal combustion engine is divided into two parts by a partition wall, and a two-part flow path is controlled by an open / close valve at the downstream part of the two divided parts. An internal combustion engine having a supercharging device is disclosed. It is also known to purge the intake air by providing a purge port (for example, EGR gas, evaporated fuel gas, PCV gas, etc.) on the upstream side of the two-divided portion of the intake path.
Depending on the internal combustion engine, a part of the purge gas suction path may be formed integrally with the outer wall of the intake path due to design restrictions or the like . In this case, as shown in FIG. A curved portion 5 that is routed along the outer wall of the intake path in a plane orthogonal to the path 1 and is curved in a plane orthogonal to the partition wall 4 is located immediately upstream of the intake path opening end 3 of the purge gas intake path 2. A structure in which the purge gas is purged into the intake passage 1 through the curved portion 5 is employed.
[0003]
[Problems to be solved by the invention]
However, in the structure of FIG. 5 , a curved portion is required immediately upstream of the intake path opening end of the purge gas suction path. As a result, a purge gas flow generates a directional component perpendicular to the partition wall when the purge gas is sucked. There is a problem that the suction is biased to one side of the cylinder group (the cylinder group connected to the divided passage where the purge gas is sucked in a large amount in the two divided parts).
It is an object of the present invention to provide a purge gas processing apparatus for an internal combustion engine in which purge gas is sucked evenly or substantially equally into both passage portions of the two divided portions of the intake passage in an internal combustion engine having a purge port in the intake passage having the two divided portions. It is to provide.
[0004]
[Means for Solving the Problems]
The present invention for achieving the above object is as follows.
A purge port is provided on the upstream side of the two-divided portion of the internal combustion engine having a two-divided portion obtained by dividing a portion of the intake passage into two portions, and the purge gas that has passed through the purge gas intake passage connected to the purge port is sucked through the purge port. A purge gas processing apparatus for an internal combustion engine that purges in a path, wherein the purge gas processing apparatus for an internal combustion engine has any one of the following structures (1), (2), and (3).
(1) A part of the purge gas intake path is provided along a passage outer wall of the intake path in a plane substantially perpendicular to the intake path axis, and is formed integrally with the passage outer wall of the intake path. An expansion chamber that reduces the direction of the purge gas flow by reducing the purge gas flow rate by enlarging the cross-sectional area of the flow path is provided immediately upstream, and the outer wall of the expansion chamber is formed integrally with the passage wall of the intake passage. A purge gas processing apparatus for an internal combustion engine.
(2) The purge port is provided immediately upstream of the intake path opening end of the purge gas intake path, and a linear portion is connected to the upstream end of the purge port;
The purge port is in a plane including the partition wall and orthogonal to the outer wall of the intake passage;
Said linear portion parallel to the partition wall and extending in the plane direction including the intake path axis, perpendicular to said purge port, extends parallel to the outer wall of the intake passage, has a length on at least purge port diameter or less, And,
A portion perpendicular to the partition wall is not provided between the intake passage opening end of the purge gas suction passage and the straight portion ,
A purge gas processing apparatus for an internal combustion engine, characterized in that a purge gas flow is made parallel to the partition wall at the purge port and the linear portion .
(3) A curved portion in which the flow path is parallel to the partition wall and in a direction perpendicular to the intake path from a portion perpendicular to the partition wall from upstream to downstream immediately upstream of the intake path opening end of the purge gas intake path A purge gas processing apparatus for an internal combustion engine, characterized in that a projection is provided on the inner wall surface of the outer side of the curved portion.
[0005]
In the purge gas processing apparatus for an internal combustion engine of the above (1), the purge gas is drawn into the intake path through the purge port immediately after the purge gas flows into the expansion chamber and the flow directionality is reduced. Inhaled evenly or nearly evenly in both passage parts.
In the purge gas processing apparatus for an internal combustion engine of the above (2), while the purge gas passes through the straight portion, it has a flow direction in the same direction as the straight portion, and this flow direction is parallel to the partition wall and the intake air. Since it is parallel to the path axis, the purge gas is sucked evenly into both passage parts of the two divided parts of the intake path.
In the purge gas processing apparatus for an internal combustion engine of the above (3), while the purge gas passes through the curved portion, the flow directionality is reduced by reducing the flow velocity of the purge gas by the protrusion and the slight labyrinth effect. Inhaled almost equally into both passage parts of the split part.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an internal combustion engine of the purge gas of the present invention (evaporated fuel gas, EGR gas, PCV gas) processing unit, with reference to FIGS. 1 to 4 will be described. FIG. 1 is applicable to any embodiment of the present invention.
Also, components that are common or similar throughout all embodiments of the present invention are labeled with the same reference numerals throughout all embodiments of the present invention.
[0007]
First, portions common or similar to all the embodiments of the present invention will be described with reference to FIGS. 1 and 2, for example.
A purge gas processing apparatus for an internal combustion engine according to the present invention is provided with a purge port 21 on the upstream side of the two-divided portion 11 of an internal combustion engine having a two-divided portion 11 obtained by dividing a part of an intake passage 10 of the internal combustion engine into two parts. This is a purge gas processing device for an internal combustion engine that purges the purge gas that has passed through the purge gas suction path 20 connected to the port 21 into the intake path 10 through the purge port 21.
[0008]
The purge gas may be any of evaporative fuel gas, EGR gas, and PCV gas. In the following description, the case of evaporative fuel gas is taken as an example.
The two-divided portion 11 may be a passage portion divided into two by the partition wall 13, or may be two passage portions in which one passage is divided into two passages at a branching portion.
The two-divided portion 11 is provided on the partition wall 13 at the downstream portion, and the two passage portions 11a and 11b of the two-divided portion 11 are controlled to be able to communicate and block by opening and closing the opening / closing valve 12, thereby the inertia supercharging effect It may be given.
[0009]
FIG. 1 shows an intake of an internal combustion engine having an inertial supercharging device in which an opening / closing valve 12 is provided downstream of a two-divided portion 11 provided with a partition wall 13 over a surge tank 14 and an intake passage portion 15 connected upstream thereof. The device is shown. A passage portion 11a on one side of the two-divided portion 11 is connected to a cylinder on one side bank of the internal combustion engine (for example, a V type 6 cylinder), and a passage portion 11b on the other side of the two-divided portion 11 is the other side of the internal combustion engine. It is connected to the cylinder in the side bank. The upstream side of the two-divided portion 11 merges into a single passage, and a throttle valve 17 is provided at the junction 16 or upstream thereof.
[0010]
A purge port 21 is provided on the upstream side of the two-divided portion 11 (on the upstream side of the upstream end of the partition wall 13 when the partition wall 13 is present) on the downstream side of the throttle valve 17, and is formed downstream of the throttle valve 17. The purge gas is sucked into the intake passage 10 and purged by the intake negative pressure.
[0011]
A part of the passage wall of the purge gas suction path 20 connected to the purge port 21 is integrally formed with the passage wall of the intake path 10 (for example, integrally cast from aluminum or resin), thereby reducing the space and the number of parts. Is peeled off.
In the example shown in FIG. 2, a part of the passage wall of the purge gas intake passage 20 is routed along the passage outer wall of the intake passage 10. The purge port 21 is desirably provided at the upper portion of the cross section of the intake passage 10 so that the moisture in the intake air is accumulated in the passage wall and is not blocked when frozen. However, the present invention is not limited to this.
[0012]
The purge gas drawn into the intake passage 10 from the purge port 21 needs to be distributed evenly to the two passage portions 11a and 11b of the two-divided portion 11 so that the performance of the cylinders in the left and right banks does not change. Therefore, the present invention provides the equal distribution structure. The uniform distribution structure is different in each embodiment of the present invention.
In the following, the configuration and operation of the parts unique to each embodiment of the present invention will be described.
[0013]
In the first embodiment of the present invention, as shown in FIG. 2, an expansion chamber 23 is provided immediately upstream of the intake path opening end 22 of the purge gas intake path 20 (also the intake path opening end 22 of the purge port 21). Yes. The purge port 21 communicates the expansion chamber 23 and the intake path 10. The axial center of the purge port 21 is in a plane including a straight line passing through the wall thickness center line of the partition wall 13 and is located upstream of the upstream end of the partition wall 13 in the intake flow direction.
The expansion chamber 23 is formed by expanding the purge gas suction path diameter more than twice as much as the cross-sectional area, and more desirably more than 4 times as large as the cross-sectional area. Moreover, the outer wall of the expansion chamber 23 is desirably formed integrally with the passage wall of the intake passage 10 and is made of aluminum or resin.
[0014]
With respect to the operation of the first embodiment, when the purge gas is sucked and flows into the expansion chamber 23, the flow velocity is rapidly decreased due to the cross-sectional area expansion, and the flow directionality is reduced. Immediately after the directionality of the flow is reduced, the air is sucked into the intake passage 10 through the purge port 21, so that it is sucked in evenly. It flows almost evenly.
[0015]
In the second embodiment of the present invention, as shown in FIG. 3, an in-plane parallel to the partition wall 13 of the intake passage 10 and including the intake passage axis is located immediately upstream of the intake passage opening end 22 of the purge gas intake passage 20. A straight line portion 24 extending in the direction and having a length of at least the diameter of the purge port 21 is provided, and a passage portion perpendicular to the partition wall 13 is provided between the intake passage opening end 22 and the straight portion 24 of the purge gas suction passage 20. It is set as the structure which does not provide. The purge port 21 is in a plane including the partition wall 13 and is orthogonal to the outer wall of the intake passage 10 .
Also, in the example of FIG. 3, the linear portion 24, parallel to the partition wall 13 in a plane containing the partition wall 13, parallel with the outer wall of the intake passage 10 extends. Further, the axis of the purge port 21 and the axis of the linear portion 24 are orthogonal to each other. The purge gas suction path 20 is bent at the end of the straight portion 24 opposite to the purge port 21. The direction of the bending may be any direction.
[0016]
With respect to the operation of the second embodiment, the purge gas has the same direction of flow as the straight portion 24 while passing through the straight portion 24, and is sucked into the intake passage 10 with this flow direction. Since the direction of the flow of the purge gas is parallel to the partition wall 13 and in the plane including the intake path axis, the purge gas flows evenly in the two passage portions 11a and 11b of the two-divided portion 11 of the intake path 10. .
[0017]
In the third embodiment of the present invention, as shown in FIG. 4 , a portion where the flow path is perpendicular to the partition wall from the upstream side to the downstream side in the purge gas flow direction, immediately upstream of the intake path opening end 22 of the purge gas suction path 20. Therefore, the curved portion 25 is formed in a direction parallel to the partition wall and perpendicular to the intake passage, and the protrusion 26 is provided on the inner surface of the outer wall of the curved portion 25.
[0018]
With respect to the operation of the third embodiment, while the purge gas passes through the curved portion 25, the direction of the purge gas flow is reduced by reducing the flow velocity of the purge gas by the projection 26 and the slight labyrinth effect by the projection 26. The two divided portions 11 are sucked almost equally into the passage portions 11a and 11b.
[0019]
【The invention's effect】
According to the purge gas processing apparatus for an internal combustion engine of claim 1, since the expansion chamber is provided immediately upstream of the intake path opening end of the purge gas suction path, the purge gas flows into the expansion chamber and the flow directionality is reduced . The purge gas is sucked evenly or substantially equally into both passage portions of the two divided portions of the intake passage.
According to the purge gas processing apparatus for an internal combustion engine of claim 2, the purge gas suction path extends immediately in the upstream portion of the intake path opening end in a plane parallel to the partition wall and including the intake path axis, and has at least a purge port diameter. Since the straight portion having the above length is provided, the purge gas has the same flow direction as the straight portion while passing through the straight portion, but this flow direction is parallel to the partition wall and the intake air. Since it is parallel to the path axis, the purge gas is sucked evenly into both passage parts of the two divided parts of the intake path.
According to the purge gas processing apparatus for an internal combustion engine of claim 3, the flow path is parallel to the partition wall from the portion perpendicular to the partition wall from upstream to downstream immediately upstream of the intake path opening end of the purge gas suction path. In addition, since the protrusion is provided on the inner wall of the outside of the curved portion of the curved portion, and the purge gas passes through the curved portion, the flow rate of the purge gas is reduced by the protrusion. The slight labyrinth effect reduces the directionality of the flow, and the purge gas is sucked almost evenly into both passage portions of the two divided portions of the intake passage.
[Brief description of the drawings]
FIG. 1 is a plan view of a purge gas processing apparatus for an internal combustion engine applied to any embodiment of the present invention.
FIG. 2 is a cross-sectional view of a purge gas processing apparatus for an internal combustion engine according to a first embodiment of the present invention.
FIG. 3 is a perspective view of a purge gas processing apparatus for an internal combustion engine according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of a purge gas processing apparatus for an internal combustion engine according to a third embodiment of the present invention.
FIG. 5 is a cross-sectional view of a conventional purge gas processing apparatus for an internal combustion engine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Intake path 11 2 division | segmentation part 11a, 11b Two passage parts 12 On-off valve 13 Partition wall 14 Surge tank 15 Intake passage part 16 Merge part 17 Throttle valve 20 Purge gas intake path 21 Purge port 22 Intake path opening end 23 Expansion chamber 24 Linear Part 25 Curved part 26 Projection part

Claims (3)

A purge port is provided on the upstream side of the two-divided portion of the internal combustion engine having a two-divided portion obtained by dividing a portion of the intake passage into two portions, and the purge gas that has passed through the purge gas intake passage connected to the purge port is sucked through the purge port. In a purge gas processing apparatus for an internal combustion engine that purges in a path, a part of the purge gas suction path is provided along the outer wall of the intake path in a plane substantially perpendicular to the intake path axis and is formed integrally with the outer wall of the intake path. , an expansion chamber immediately upstream portion of the intake path open end of the purge gas suction path reduces the purge gas flow rate by the flow path cross-sectional area enlarged to reduce the directionality of the purge gas stream is provided, the passage wall of the intake passage an outer wall of the expansion chamber And a purge gas processing device for an internal combustion engine. A purge port is provided on the upstream side of the two-divided portion of the internal combustion engine having a two-divided portion obtained by dividing a portion of the intake passage into two portions, and the purge gas that has passed through the purge gas intake passage connected to the purge port is sucked through the purge port. In a purge gas processing apparatus for an internal combustion engine that purges in a path,
The purge port is provided immediately upstream of the opening end of the intake path of the purge gas intake path, and a straight portion is connected to the upstream end of the purge port,
The purge port is in a plane including the partition wall and orthogonal to the outer wall of the intake passage;
Said linear portion parallel to the partition wall and extending in the plane direction including the intake path axis, perpendicular to said purge port, extends parallel to the outer wall of the intake passage, has a length on at least purge port diameter or less, And,
A portion perpendicular to the partition wall is not provided between the intake passage opening end of the purge gas suction passage and the straight portion ,
A purge gas processing apparatus for an internal combustion engine, characterized in that a purge gas flow is made parallel to the partition wall at the purge port and the linear portion .   A purge port is provided on the upstream side of the two-divided portion of the internal combustion engine having a two-divided portion obtained by dividing a portion of the intake passage into two portions, and the purge gas that has passed through the purge gas intake passage connected to the purge port is sucked through the purge port. In a purge gas processing apparatus for an internal combustion engine that purges in a path, the flow path is parallel to the partition wall from a portion perpendicular to the partition wall from upstream to downstream immediately upstream of the intake path opening end of the purge gas suction path. A purge gas processing apparatus for an internal combustion engine, comprising a curved portion directed in a direction perpendicular to the intake path, and a projection provided on a wall inner surface outside the curved portion of the curved portion.

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