JP5825903B2 - Resin intake manifold - Google Patents

Description

  The present invention relates to an intake manifold provided in an intake system of an engine, and more particularly, to a resin-made intake manifold made of resin.

  In Patent Document 1, a blow-by gas blowing passage formed in an intake manifold is connected to a weld bead provided on an inner wall surface of an air connector connected to an upstream side of a surge tank, and a resin cover that is a separate member from the air connector. A technique for forming the two by adhering to each other is disclosed.

JP 2009-203929 A

  However, in the technique of Patent Document 1, since the resin cover fixed to the inner wall surface protrudes inside the intake passage and the cross-sectional area of the intake passage is reduced, the air flow is inhibited. Therefore, the cylinder distribution efficiency of air and blow-by gas decreases. Here, the cylinder distribution efficiency refers to a ratio that is equally distributed to each cylinder of the engine.

  Moreover, since the opening area of the opening formed between the inner wall surface of the air connector and the resin cover is small, it is difficult for blow-by gas to be blown out from the opening into the intake passage. This makes it difficult for air and blow-by gas to mix with each other, further reducing the cylinder distribution efficiency.

  Also, the blow-by gas blow-off passage is formed by two pieces (members) of an air connector and a resin cover, and the blow-by gas blow-off passage is secured by fixing the resin cover to the inner wall surface of the air connector. Is forming. Therefore, when manufacturing an intake manifold, the man-hour which adheres a resin cover to the inner wall surface of an air connector is needed. Therefore, the manufacturing cost of the intake manifold increases.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a resin intake manifold capable of improving cylinder distribution efficiency of a mixed gas containing air and blow-by gas. Let it be an issue.

One aspect of the present invention made to solve the above problems includes a surge tank into which air is introduced from an intake inlet and a branch passage that communicates with the surge tank and distributes the air to a plurality of cylinders of the engine. The resin intake manifold has a PCV passage for introducing blow-by gas into the surge tank, the PCV passage extending along the air flow direction, and a surge formed on the surge tank side of the PCV passage. The tank-side opening is formed so as to obliquely intersect the passage axis of the PCV passage.

  According to this aspect, the surge tank side opening of the PCV passage is formed so as to cross obliquely with respect to the passage axis of the PCV passage. Thereby, blow-by gas can be diffused at once in the surge tank without obstructing the flow of air (intake air) inside the surge tank. Therefore, the mixed gas containing air and blowby gas is easily distributed evenly from the surge tank to the plurality of branch passages. Therefore, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas can be improved. The “passage axis” is the central axis of the passage portion through which blow-by gas flows in the PCV passage. Further, “cylinder distribution efficiency” is a ratio that is evenly distributed to a plurality of cylinders of the engine.

  In said aspect, it is preferable that the said PCV channel | path is integrally formed in the components which form the said surge tank.

  According to this aspect, since the PCV passage is formed integrally with the components forming the surge tank, the passage for introducing blow-by gas into the surge tank as in the prior art is formed by assembling a plurality of members. The number of steps for assembling multiple members can be reduced. Therefore, the manufacturing cost can be reduced.

  In said aspect, it is preferable that the external shape of the said surge tank side opening part is formed in the rectangle.

  According to this aspect, since the outer shape of the surge tank side opening of the PCV passage is formed in a quadrangle, the opening area is larger than when the surge tank side opening is formed in a circle. Therefore, a large amount of blow-by gas can be introduced into the surge tank. Therefore, the adjustment range of the amount of blow-by gas introduced into the surge tank is increased according to the amount of air inside the surge tank. Therefore, the cylinder distribution efficiency can be further improved.

  In the above aspect, the PCV passage is inclined toward the surge tank side from the PCV pipe side opening formed on the PCV pipe side where the blow-by gas is introduced to the surge tank side opening. Are preferred.

  According to this aspect, the PCV passage is inclined toward the surge tank from the opening on the PCV pipe side to the opening on the surge tank side. Thereby, when joining a PCV pipe to the components which form a surge tank, the joining state of the components which form a surge tank, and a PCV pipe can be improved. Further, water contained in the blow-by gas introduced from the PCV pipe into the PCV passage is likely to be discharged into the surge tank through the PCV passage.

  In the above aspect, the surge tank is connected to the intake inlet, and the flow path axis is formed in a curved shape, and the flow path axis is formed in a straight line connected to the introduction flow path. It is preferable that the surge tank side opening is formed at a position of the main flow path portion.

  According to this aspect, since the surge tank side opening is formed at the position of the main flow path portion of the surge tank, the blow-by gas is directly introduced into the main flow path portion of the surge tank where the air flow is stable. The Therefore, the air inside the surge tank and the blow-by gas can be mixed stably. Thereby, the mixed gas containing air and blow-by gas can be more evenly distributed from the surge tank to the plurality of branch passages. Accordingly, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas can be further improved.

  According to the resin intake manifold according to the present invention, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas can be improved.

It is a front view of a resin-made intake manifold. It is the figure which looked at the resin-made intake manifolds shown in FIG. 1 from the drawing right side. It is the figure which looked at the resin-made intake manifolds shown in FIG. 1 from the drawing upper side. It is AA sectional drawing of FIG. It is an exploded view of a resin intake manifold. It is the figure of the state which removed the lower piece from the resin-made intake manifolds, Comprising: It is the figure seen from the joining surface side with the lower piece in a middle piece. It is BB sectional drawing of FIG. It is a figure which shows arrangement | positioning of the shaping | molding die when forming a PCV channel | path.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings.

[Description of resin intake manifold]
First, an overall outline of the resin intake manifold 1 will be described. Here, FIG. 1 is a front view of the resin intake manifold 1, FIG. 2 is a view of the resin intake manifold 1 shown in FIG. 1 viewed from the right side of the drawing, and FIG. 3 is a resin intake manifold shown in FIG. It is the figure which looked at 1 from the drawing upper side. 4 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 5 is an exploded view of the resin intake manifold 1.

  As shown in FIGS. 1 to 5, the resin-made intake manifold 1 includes an upper piece 10, a middle piece 12, a lower piece 14, and the like. Further, as shown in FIG. 4, the upper piece 10 is arranged on the upper side of the middle piece 12 and constitutes an upper half shell portion of each branch passage 16 located on the upper side of the drawing. The middle piece 12 is arranged on the lower side of the drawing with respect to the upper piece 10 and constitutes the upper half shell portion of the surge tank 18 and also the lower half shell portion of each branch passage 16 located on the upper side of the surge tank 18 in the drawing. Configure. Further, the lower piece 14 is arranged on the lower side of the drawing with respect to the middle piece 12 and constitutes a lower half shell portion of the surge tank 18 and constitutes each branch passage 16 positioned on the lower side of the surge tank 18 in the drawing. The upper piece 10, the middle piece 12, and the lower piece 14 are each formed into a predetermined shape by injection molding using a synthetic resin as a material.

  The branch passage 16 communicates with the surge tank 18, branches from the surge tank 18, has a curved shape, and is formed in a plurality. Here, as an example, four branch passages 16 are formed. A portion of the branch passage 16 located on the lower side of the drawing in FIG. 4 with respect to the surge tank 18 is formed by a curved conduit 20 provided in the lower piece 14. Further, in the branch passage 16, a portion located on the upper side of the drawing in FIG. 4 with respect to the surge tank 18 is formed by the upper piece 10 and the middle piece 12. As shown in FIG. 4, the surge tank 18 is formed between the middle piece 12 and the lower piece 14 and is disposed so as to be enclosed inside the curved branch passage 16.

  As shown in FIGS. 1 to 3 and 5, the resin intake manifold 1 is formed with a flange 22 for fixing a throttle device (not shown). The flange 22 is formed with an intake inlet 24 that communicates with the internal surge tank 18. As shown in FIG. 2, a flange 26 for attaching an EGR pipe (not shown) is formed in the resin intake manifold 1. The flange 26 is formed with an EGR gas inlet 28 leading to the internal surge tank 18.

  As shown in FIGS. 1 to 3, the resin intake manifold 1 has a blow-by gas reduction pipe (not shown) used to recirculate blow-by gas from a crankcase (not shown) of an engine (not shown). PCV (Positive Crankcase Ventilation) pipe 30 (pipe joint) is formed. The PCV pipe 30 is formed integrally with the upper piece 10. The PCV pipe 30 communicates with the internal surge tank 18 via a PCV passage 32 (see FIG. 6) described later. The blowby gas introduced into the PCV pipe 30 from the blowby gas reduction pipe is introduced into the surge tank 18 through the PCV passage 32 communicating with the PCV pipe 30.

  Further, as shown in FIGS. 1, 3 and 5, the resin intake manifold 1 has a pipe joint 34 for attaching a negative pressure pipe (not shown) for introducing a negative pressure to a brake booster (not shown). It is formed. This pipe joint 34 leads to the internal surge tank 18.

  In the resin intake manifold 1 having such a structure, air (intake air) filtered by an air cleaner (not shown) is introduced into the surge tank 18 from the intake inlet 24 through a throttle device (not shown). . Further, blow-by gas sent from a crankcase (not shown) of an engine (not shown) is introduced into the surge tank 18 from the PCV pipe 30 through the PCV passage 32. The air introduced into the surge tank 18 is blow-by gas introduced into the surge tank 18 through the PCV passage 32 or EGR gas introduced into the surge tank 18 from the EGR gas inlet 28. It is mixed with gas other than air. Thereafter, a mixed gas of air and a gas other than air is distributed to each branch passage 16 and introduced into each cylinder (not shown) of the engine through each branch passage 16.

  In addition, the resin intake manifold 1 having such a structure is manufactured by combining the upper piece 10, the middle piece 12, and the lower piece 14 together and joining them together by vibration welding. In addition, the case where the piece by which the upper piece 10 and the middle piece 12 were integrally molded is also considered.

[Explanation of middle piece]
Next, the middle piece 12 among the pieces constituting such a resin intake manifold 1 will be described. Here, FIG. 6 is a view of the state in which the lower piece 14 is removed from the resin intake manifold 1, and is a view as seen from the joint surface side of the middle piece 12 with the lower piece 14. FIG. 7 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 6, a flange 36 fixed to a cylinder head (not shown) of an engine (not shown) is formed on the side of the middle piece 12 where the lower piece 14 is joined. The flange 36 is formed with four intake outlets 38 corresponding to a four-cylinder engine side by side. A plurality of mounting holes 40 for fixing to the cylinder head are formed at the edge of the flange 36. Further, a concave portion 42 constituting the upper half shell portion of the surge tank 18 is formed on the side of the middle piece 12 where the lower piece 14 is joined. Four passage openings 44 corresponding to the respective branch passages 16 are formed side by side on the opposite side of the flange 36 across the recess 42. Further, a gas introduction hole 46 communicating with the surge tank 18 is formed in the middle portion of the middle piece 12 corresponding to the pipe joint 34.

  On the other hand, as shown in FIG. 7, a passage groove 48 constituting the lower half shell portion of each upper branch passage 16 is formed on the side of the middle piece 12 where the upper piece 10 is joined. Four passage grooves 48 are formed side by side on the right side of FIG. Further, a PCV pipe base 50 for joining the PCV pipe 30 is formed on the side of the middle piece 12 where the upper piece 10 is joined. An opening 52 on the PCV pipe 30 side of the PCV passage 32 is formed between the PCV pipe bases 50, and blow-by gas is introduced from the opening 52 into the surge tank 18 through the PCV passage 32. As described above, in this embodiment, the PCV pipe base 50 is not provided with an introduction hole for directly introducing the blowby gas into the surge tank 18, but the blowby gas is passed through the PCV passage 32 and the surge tank. 18 is introduced.

[Description of PCV passage]
Next, the PCV passage 32 formed in the middle piece 12 will be described. As shown in FIGS. 6 and 7, the PCV passage 32 is formed integrally with the bottom of the recess 42 of the middle piece 12. In the PCV passage 32, one opening 54 communicates with the surge tank 18, and the other opening 52 communicates with the PCV pipe 30. The blow-by gas is introduced into the surge tank 18 from the PCV pipe 30 through the PCV passage 32. The opening 54 is an example of the “surge tank side opening” in the present invention, and the opening 52 is an example of the “PCV pipe side opening” in the present invention.

  As described above, the PCV passage 32 includes the opening 54 as a passage port on the side communicating with the surge tank 18. And this opening part 54 is formed so that it may cross | intersect the channel | axis axis Lp of the PCV channel | path 32 diagonally, as shown in FIG. That is, with respect to the direction of the passage axis Lp, the opening 54 is such that the end 56 on the upper piece 10 side (upper side in FIG. 7) protrudes closer to the surge tank 18 than the end 58 on the lower piece 14 side (lower side in FIG. 7). It is formed to do. And the opening part 54 is formed so that the edge part 56 and the edge part 58 may be connected linearly. Here, the passage axis Lp is the central axis of the passage portion through which blow-by gas flows in the PCV passage 32.

  Thereby, the blow-by gas introduced from the PCV pipe 30 into the PCV passage 32 is introduced into the surge tank 18 so as to be uniformly diffused from the opening 54. Therefore, the flow of air introduced from the intake inlet 24 into the surge tank 18 is not inhibited by the blow-by gas introduced from the PCV pipe 30 through the PCV passage 32 into the surge tank 18. And air and blow-by gas can be mixed well. Accordingly, the mixed gas containing air and blow-by gas is stably distributed from the surge tank 18 to the four branch passages 16 and is equally distributed to each cylinder of the engine. Therefore, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas is improved. Here, the cylinder distribution efficiency refers to a ratio that is uniformly distributed to each cylinder of the engine.

  Moreover, as shown in FIG. 6, the opening part 54 of the PCV channel | path 32 is formed in the rectangle. Thereby, compared with the case where the opening part 54 is formed circularly, the opening area of the opening part 54 can be enlarged. Therefore, a large amount of blow-by gas can be introduced into the surge tank 18 from the PCV passage 32. Therefore, the amount of blow-by gas introduced from the PCV passage 32 into the surge tank 18 can be widely adjusted according to the amount of air introduced from the intake inlet 24 into the surge tank 18. Therefore, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas is further improved. In the example shown in FIG. 6, the opening shape of the opening portion 54 of the PCV passage 32 is specifically formed in a rectangular shape with rounded corners. The opening shape of the opening 54 of the PCV passage 32 may be a square, but a rectangular shape is more desirable.

  Further, as shown in FIG. 7, the PCV passage 32 is inclined from the opening 52 on the PCV pipe 30 side to the opening 54 on the surge tank 18 side toward the surge tank 18 (lower right in the drawing). Thereby, the height difference between the left and right parts of the PCV pipe base 50 can be suppressed. Therefore, when the upper piece 10 and the middle piece 12 are welded, the PCV pipe 30 and the PCV pipe base 50 can be reliably welded, and the joining state of the PCV pipe 30 and the PCV pipe base 50 is improved. be able to. Furthermore, the water contained in the blow-by gas introduced from the PCV pipe 30 into the PCV passage 32 is easily discharged into the surge tank 18 through the lower surface of the PCV passage 32 in the drawing.

  Further, as shown in FIG. 6, the surge tank 18 communicates with the intake inlet 24 and has an introduction channel portion 60 in which the channel axis L <b> 1 is formed in a curved shape, and a channel that communicates with the introduction channel portion 60. The main flow path part 62 in which the axis line L2 was formed in the linear shape is provided. As shown in FIG. 6, the opening 54 of the PCV passage 32 is formed at the position of the main flow path portion 62. Therefore, blow-by gas is directly introduced into the main flow path portion 62 of the surge tank 18 from the opening 54 of the PCV passage 32. Here, the air flow is more stable in the main flow path portion 62 of the surge tank 18 than in the introduction flow path portion 60. Therefore, blow-by gas can be mixed with air stably.

  In such a PCV passage 32, as shown in FIG. 8, a slide mold 68 is disposed between the first mold 64 and the second mold 66, and the first mold 64, the second mold 66 and the slide are arranged. It is formed by injecting molten resin into a cavity formed between the mold 68 and solidifying the resin. As shown in FIG. 8, the passage portion of the PCV passage 32 is formed by the slide mold 68, and the opening 54 is formed by the first mold 64.

[Effect of this embodiment]
According to the present embodiment, the opening 54 on the surge tank 18 side of the PCV passage 32 is formed so as to obliquely intersect the passage axis Lp of the PCV passage 32. Thereby, the blow-by gas can be diffused at once in the surge tank 18 without hindering the flow of air inside the surge tank 18. Therefore, the mixed gas containing air and blow-by gas is easily distributed evenly from the surge tank 18 to the plurality of branch passages 16. Therefore, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas can be improved.

  In addition, since the PCV passage 32 is formed integrally with the middle piece 12 forming the surge tank 18, the passage for introducing blow-by gas into the surge tank is formed by assembling a plurality of members as in the prior art. The number of steps for assembling multiple members can be reduced. Therefore, the manufacturing cost can be reduced. Furthermore, when the passage for introducing blow-by gas into the surge tank is formed by assembling a plurality of members by welding or the like, the blow-by gas introduction portion formed thickly reduces the air flow inside the surge tank. The problem of obstruction can be eliminated.

  Moreover, since the external shape of the opening part 54 by the side of the surge tank 18 of the PCV channel | path 32 is formed in the rectangle, the opening area is large. Therefore, a large amount of blow-by gas can be introduced into the surge tank 18. Therefore, the adjustment range of the amount of blow-by gas introduced into the surge tank 18 is increased according to the amount of air inside the surge tank 18. Therefore, the cylinder distribution efficiency can be further improved.

  The PCV passage 32 is inclined toward the surge tank 18 from the opening 52 on the PCV pipe 30 side to the opening 54 on the surge tank 18 side. Thereby, when joining the PCV pipe 30 to the middle piece 12, the joining state of the middle piece 12 and the PCV pipe 30 can be improved. Further, the water contained in the blow-by gas introduced from the PCV pipe 30 into the PCV passage 32 is easily discharged into the surge tank 18 through the PCV passage 32.

  Further, since the opening 54 on the surge tank 18 side of the PCV passage 32 is formed at the position of the main flow path portion 62 of the surge tank 18, the blow-by gas has a main flow path portion of the surge tank 18 in which the air flow is stable. 62 is introduced directly. Therefore, the air inside the surge tank 18 and the blow-by gas can be mixed stably. As a result, the mixed gas containing air and blow-by gas can be more evenly distributed from the surge tank 18 to the plurality of branch passages 16. Accordingly, the cylinder distribution efficiency of the mixed gas containing air and blow-by gas can be further improved.

  Further, since the opening 54 of the PCV passage 32 is away from the intake inlet 24, there is no possibility that blow-by gas flows into the intake inlet 24. Therefore, since the oil contained in the blow-by gas does not adhere to the throttle valve (not shown) provided in the intake air inlet 24, the operation of the throttle valve is stabilized. Therefore, air can be stably introduced into the surge tank 18.

  It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Resin intake manifold 10 Upper piece 12 Middle piece 14 Lower piece 16 Branch passage 18 Surge tank 30 Fitting 32 PCV passage 42 Concave portion 54 Opening portion

Claims (5)

In a resin intake manifold having a surge tank into which air is introduced from an intake air inlet and a branch passage communicating with the surge tank and distributing the air to a plurality of cylinders of the engine,
A PCV passage for introducing blow-by gas into the surge tank;
The PCV passage extends along the air flow direction;
The surge tank side opening formed on the surge tank side of the PCV passage is formed so as to cross obliquely with respect to the passage axis of the PCV passage;
Resin intake manifold featuring The resin intake manifold according to claim 1,
The PCV passage is formed integrally with a part forming the surge tank;
Resin intake manifold featuring The resin intake manifold according to claim 1 or 2,
The outer shape of the surge tank side opening is formed in a square,
Resin intake manifold featuring The resin intake manifold according to any one of claims 1 to 3,
The PCV passage is inclined toward the surge tank side from the PCV pipe side opening formed on the PCV pipe side into which the blow-by gas is introduced to the surge tank side opening;
Resin intake manifold featuring The resin intake manifold according to any one of claims 1 to 4,
The surge tank communicates with the intake inlet and has a flow passage axis formed in a curved shape, and a main flow passage portion communicated with the introduction flow passage and formed with a straight flow passage axis. With
The surge tank side opening is formed at the position of the main flow path;
Resin intake manifold featuring

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