JP5686692B2 - 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, in a resin intake manifold configured by combining a plurality of resin pieces, a piece in which a PCV pipe (pipe joint) is integrally formed and a piece in which a PCV pipe base is integrally formed are provided. A technique for joining and connecting a PCV pipe to a gas introduction hole provided in a PCV pipe base is disclosed.

JP 2009-221860 A

  In the technique of Patent Document 1, blow-by gas is introduced into a surge tank through a PCV pipe through a gas introduction hole. However, if the blow-by gas is introduced into the surge tank as it is from the gas introduction hole in this way, there is a possibility that the flow of air inside the surge tank is hindered.

  In view of this, the present applicant, in a patent application (Application No. 2011-163215), formed a PCV passage in the middle piece, and passed blow-by gas through the PCV passage to the inside of the surge tank at the back of the surge tank. Proposed to be introduced. And since blow-by gas was introduced in the inside of a surge tank in the back | inner side part of the surge tank where the air flow was stabilized, it proposed that there was no possibility of inhibiting the air flow inside a surge tank.

  According to the proposal in this patent application, the blow-by gas introduced from the PCV pipe is introduced into the surge tank through the PCV passage. At this time, the water generated by the water contained in the blow-by gas is similarly discharged through the PCV passage into the surge tank. However, when the resin intake manifold is mounted on an engine such as a vehicle, the joint portion between the middle piece and the PCV pipe is disposed below (the side on which gravity acts) with respect to the blow-by gas inlet of the PCV pipe. Then, there is a possibility that water generated by the moisture contained in the blow-by gas may accumulate in the joint portion. Then, in the low temperature environment, the water accumulated in the joint portion between the seat portion of the PCV pipe and the base for the PCV pipe of the middle piece may be frozen, and the frozen portion of the water may block the inlet portion of the PCV passage. .

  Accordingly, the present invention has been made to solve the above-described problems, and is made of a resin in which water does not stay in a joint portion between a pipe joint into which a gas containing moisture is introduced and a piece joined to the pipe joint. It is an object to provide an intake manifold.

  One aspect of the present invention made to solve the above-described problems includes a surge tank into which air is introduced from an intake air inlet, and a branch passage that communicates with the surge tank and distributes the air to a plurality of cylinders of the engine. A resin intake manifold, comprising: a piece that forms the surge tank; and a pipe joint that is joined to the piece and into which gas is introduced, and the piece introduces the gas that is introduced from the pipe joint into the surge tank. A pipe joint base that is formed in an annular shape and joins the pipe joint, and a projecting portion that is formed inside the pipe joint base and protrudes toward the pipe joint side. A seat formed in an annular shape and joined to the pipe joint base, a tube formed inside the seat and through which the gas passes, and formed at an end of the tube on the piece side A surplus portion, and the surplus portion and the front end portion are overlapped with a gap therebetween so that the tip portion of the protruding portion is disposed outside the surplus portion. And

  According to this aspect, the tip portion of the protruding portion of the piece is arranged outside the surplus portion of the pipe joint, and the extra portion of the pipe joint and the tip portion of the protruding portion of the piece are spaced apart. Overlapping. Therefore, water generated by moisture contained in the gas introduced into the pipe joint flows from the surplus part of the pipe joint into the protruding part of the piece, and then is discharged to the surge tank through the introduction passage formed in the piece. Is done. Therefore, the water does not flow into the joint portion between the pipe joint seat and the piece pipe joint base. Therefore, water does not stay in the joint portion between the pipe joint seat and the piece pipe joint base.

  In the above aspect, the introduction passage is inclined toward the surge tank side from a fitting side opening formed on the fitting side to a surge tank side opening formed on the surge tank side. It is preferable.

  According to this aspect, since the introduction passage is inclined toward the surge tank side from the pipe joint side opening to the surge tank side opening, water contained in the gas introduced into the pipe joint travels along the introduction passage. It is surely discharged to the surge tank. Therefore, the water contained in the gas introduced into the pipe joint can be reliably discharged to the surge tank.

  In the above aspect, the protruding portion includes a trunk portion connected to the tip portion, and a step portion formed between the tip portion and the stem portion, and the surplus portion and the tip portion. In the arrangement direction, the thickness of the tip portion is preferably smaller than the thickness of the backbone portion.

  According to this aspect, the protruding portion of the piece includes the stepped portion, and the thickness of the distal end portion is smaller than the thickness of the backbone portion in the arrangement direction of the surplus portion of the conduit and the distal end portion of the piece. Thereby, size reduction of the structure of the joint part vicinity of a piece and a pipe joint can be achieved.

  In said aspect, it is preferable that the said front-end | tip part is arrange | positioned in the position of the direction where gravity acts with respect to the said surplus part.

  According to this aspect, the tip portion of the protruding portion of the piece is arranged at a position in the direction in which gravity acts on the surplus portion of the pipe joint. Therefore, the water generated by the moisture contained in the gas introduced into the pipe joint surely flows down from the surplus part of the pipe joint to the protruding part of the piece, and then is discharged to the surge tank through the introduction passage provided in the piece. Can be made.

  In the above aspect, the pipe joint is preferably a PCV pipe into which blow-by gas is introduced.

  According to this aspect, the pipe joint is a PCV pipe into which blow-by gas is introduced. Thereby, the water produced | generated with the water | moisture content contained in blow-by gas does not stay in the junction part of a PCV pipe and a piece.

  According to the resin-made intake manifold according to the present invention, water does not stay in a joint portion between a pipe joint into which a gas containing moisture is introduced and a piece joined to the pipe joint.

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 CC sectional drawing of FIG.

  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 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. The blow-by gas is an example of the “gas” in the present invention, the PCV pipe 30 is an example of the “pipe joint” in the present invention, and the PCV passage 32 is an example of the “introduction passage” in the present invention.

  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. The PCV pipe base 50 is an example of a “pipe joint base” in the present invention, and the opening 52 is an example of a “pipe joint side opening” in the present invention.

[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.

  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. Further, the water generated by the moisture 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, introduces a flow path axis 56 in which a flow path axis L <b> 1 is formed in a curved shape, and communicates with the flow path 56. The main flow path part 58 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 58. Therefore, blow-by gas is directly introduced into the main flow path portion 58 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 58 of the surge tank 18 than in the introduction flow path portion 56. Therefore, blow-by gas can be mixed with air stably.

[Description of the structure near the joint between the middle piece and the PCV pipe]
Next, the structure in the vicinity of the joint portion between the middle piece 12 and the PCV pipe 30 will be described. Here, FIG. 8 is a CC cross-sectional view of FIG. 8 corresponds to the downward direction when the resin intake manifold 1 is mounted on an engine (not shown) such as a vehicle (not shown), and also corresponds to the direction of action of gravity.

  As shown in FIG. 8, the PCV pipe 30 is formed with a straight pipe portion 60 that is an inlet for blow-by gas and a slanted downward connection toward the middle piece 12 that is connected to the straight pipe portion 60. And an inclined pipe portion 62 that passes therethrough. Thus, the PCV pipe 30 has a shape that is bent halfway. In addition, the PCV pipe 30 includes a seat portion 64 that is joined by welding to the PCV pipe base 50, and a transition portion 66 that is formed between the inclined pipe portion 62 and the seat portion 64. The seat portion 64 is formed in an annular shape, and the inclined pipe portion 62 is formed inside the seat portion 64. Further, the PCV pipe 30 includes a surplus portion 68 formed at an end portion of the inclined pipe portion 62 on the middle piece 12 side. The surplus portion 68 is formed so as to protrude from the position of the transition portion 66 toward the middle piece 12 side.

  On the other hand, as shown in FIG. 8, the middle piece 12 is formed on the inner side of the annular PCV pipe base 50 and is formed at the wall 70 and an end of the wall 70 at the lower right side of the drawing. And a projecting portion 72 projecting to the pipe 30 side. Further, the middle piece 12 includes a crossing portion 74 formed between the wall portion 70 and the PCV pipe base 50 and between the protruding portion 72 and the PCV pipe base 50.

  Under such a configuration, the blow-by gas introduced into the straight pipe portion 60 of the PCV pipe 30 passes through the inclined pipe portion 62 and is guided by the wall portion 70 to reach the opening portion 52 of the PCV passage 32. , Introduced into the surge tank 18 through the PCV passage 32. At this time, the water produced by the moisture contained in the blow-by gas is discharged to the surge tank 18 through a similar path.

  Here, in this embodiment, the surplus portion 68 and the projecting portion 72 are arranged such that the tip portion 76 of the projecting portion 72 of the middle piece 12 is disposed at an outer position with respect to the surplus portion 68 of the PCV pipe 30. The front end portion 76 is overlapped with an interval. That is, the distal end portion 76 of the projecting portion 72 is disposed with the surplus portion 68 sandwiched between the passage through which blow-by gas formed inside the inclined tube portion 62 passes, and the distal end of the surplus portion 68 and the projecting portion 72. The portion 76 is overlapped with an interval. More specifically, when the resin intake manifold 1 is mounted on an engine (not shown) such as a vehicle (not shown), the distal end portion 76 of the protrusion 72 is directed downward (gravity) with respect to the surplus portion 68. The surplus portion 68 and the tip portion 76 of the protruding portion 72 are overlapped with each other while being spaced apart from each other.

  As a result, when the resin intake manifold 1 is mounted on an engine such as a vehicle, the water generated by the moisture contained in the blow-by gas travels along the inner wall 78 of the inclined pipe portion 62 of the PCV pipe 30 and the surplus portion. It flows to 68. Thereafter, the water flows down from the surplus portion 68 to the protruding portion 72 of the middle piece 12 as shown by the arrow in FIG. Then, the water that has flowed down to the projecting portion 72 on the middle piece 12 hits the wall portion 70, and then is discharged into the surge tank 18 through the PCV passage 32.

  As described above, the water generated by the moisture contained in the blow-by gas does not flow into the joint portion between the seat portion 64 of the PCV pipe 30 and the PCV pipe base 50 of the middle piece 12. Then, the water is discharged to the surge tank 18 without staying at the joint portion between the seat portion 64 of the PCV pipe 30 and the PCV pipe base 50 of the middle piece 12.

  Further, the protruding portion 72 of the middle piece 12 includes a backbone portion 80 connected to the distal end portion 76. The projecting portion 72 includes a stepped portion 82 between the backbone portion 80 and the distal end portion 76, and the thickness T 1 of the distal end portion 76 in the arrangement direction of the surplus portion 68 and the distal end portion 76 is set to The thickness is smaller than T2. In this way, with respect to the arrangement direction of the surplus portion 68 and the tip portion 76, the inner surface of the tip portion 76 (the surface on the surplus portion 68 side) is the inner surface of the backbone portion 80 (the passage side through which blow-by gas passes ) On the outer side (PCV pipe base 50 side). Thereby, the protrusion 72 can be formed as close as possible to the inner side (passage side through which blow-by gas passes), and the interval δ between the PCV pipe bases 50 can be reduced. Therefore, it is possible to reduce the size of the structure in the vicinity of the joint portion between the middle piece 12 and the PCV pipe 30.

[Effect of this embodiment]
According to the present embodiment, the leading end portion 76 of the protruding portion 72 of the middle piece 12 is disposed outside the surplus portion 68 of the PCV pipe 30 so that the surplus portion 68 and the leading end portion 76 are spaced from each other. Are overlapping. Therefore, the water produced by the moisture contained in the blow-by gas flows from the surplus portion 68 into the protrusion 72 and then is discharged to the surge tank 18 through the PCV passage 32. Therefore, the water does not flow into the joint portion between the seat portion 64 of the PCV pipe 30 and the PCV pipe base 50 of the middle piece 12. Therefore, water does not stay at the joint portion between the seat portion 64 of the PCV pipe 30 and the PCV pipe base 50 of the middle piece 12. Therefore, water does not freeze at the joint portion between the seat portion 64 of the PCV pipe 30 and the PCV pipe base 50 of the middle piece 12 in a low temperature environment, and the opening 52 of the PCV passage 32 is blocked by the frozen material of the water. It will never be done.

  Further, since the PCV passage 32 is inclined toward the surge tank 18 from the opening 52 to the opening 54, the water generated by the moisture contained in the blow-by gas introduced into the PCV pipe 30 is the PCV passage 32. Is surely discharged to the surge tank 18. Therefore, the water can be reliably discharged to the surge tank 18.

  Further, the projecting portion 72 includes a stepped portion 82, and the thickness T 1 of the distal end portion 76 is smaller than the thickness T 2 of the backbone portion 80 in the arrangement direction of the surplus portion 68 and the distal end portion 76. Thereby, size reduction of the structure of the junction part vicinity of the middle piece 12 and the PCV pipe 30 can be achieved.

  Moreover, since the front-end | tip part 76 of the protrusion part 72 of the middle piece 12 is arrange | positioned in the position of the direction where gravity acts with respect to the surplus part 68 of the PCV pipe 30, it produces | generates with the water | moisture content contained in blow-by gas for that reason. The water to be discharged can surely flow down from the surplus portion 68 to the protruding portion 72, and then be discharged to the surge tank 18 through the PCV passage 32.

<Modification>
In the above embodiment, the structure in the vicinity of the joint portion between the middle piece 12 and the PCV pipe 30 has been described, but the present invention is not limited to this. For example, the present invention can be applied to a structure in the vicinity of a joint portion between the flange 26 of the middle piece 12 and an EGR pipe (not shown).

  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 PCV pipe 32 PCV passage 50 PCV pipe base 52 Opening portion 54 Opening portion 60 Straight pipe portion 62 Inclined pipe portion 64 Seat portion 68 Extra portion 72 Protruding part 76 Tip part 82 Step part

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 piece forming the surge tank;
A pipe joint that is joined to the piece and into which gas is introduced,
The piece is formed inside an introduction passage for introducing the gas introduced from the pipe joint into the surge tank, a pipe joint base that is formed in an annular shape and joins the pipe joint, and an inner side of the pipe joint base. Protruding portion protruding to the pipe joint side,
The pipe joint is formed in a ring-shaped seat part joined to the pipe joint base, a pipe part formed inside the seat part through which the gas passes, and an end part on the piece side of the pipe part. And a surplus portion,
The tip portion of the protruding portion is arranged outside the surplus portion, and the surplus portion and the tip portion are overlapped with a gap therebetween,
Resin intake manifold featuring The resin intake manifold according to claim 1,
The introduction passage is inclined toward the surge tank side from the fitting side opening formed on the fitting side to the surge tank side opening formed on the surge tank side,
Resin intake manifold featuring The resin intake manifold according to claim 1 or 2,
The protrusion includes a backbone portion connected to the tip portion, and a step portion formed between the tip portion and the backbone portion,
The thickness of the tip portion is smaller than the thickness of the backbone portion with respect to the arrangement direction of the surplus portion and the tip portion,
Resin intake manifold featuring The resin intake manifold according to any one of claims 1 to 3,
The tip portion is disposed at a position in a direction in which gravity acts on the surplus portion,
Resin intake manifold featuring The resin intake manifold according to any one of claims 1 to 4,
The pipe joint is a PCV pipe into which blow-by gas is introduced;
Resin intake manifold featuring

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