JP6510858B2 - Intake manifold - Google Patents

Description

  The present invention relates to an intake manifold of an internal combustion engine.

  In internal combustion engines including internal combustion engines for vehicles, it is widely practiced to make the intake manifold of resin. In this case, the resin-made intake manifold is composed of a plurality of members from the die cutting point and integrated by welding or the like.

  In an internal combustion engine, exhaust gas (EGR gas) is recirculated to the intake system, and blowby gas blown into the crank chamber is returned to the intake system. For example, Patent Document 1 discloses an intake manifold. It is disclosed to form a blow-by gas passage in the mating surface of two members and to distribute the blow-by gas from the blow-by gas passage to the individual intake passages.

  Further, in Patent Document 2, a plurality of spacers are interposed between an intake manifold and a cylinder head, and a blow-by gas passage and an EGR passage which are in a posture long in a direction crossing a group of intake passages are provided on a mating surface of two spacers. Are separately formed on both sides of a group of intake passages, and the blowby gas and the EGR gas are distributed from the blowby gas passage and the EGR passage to the intake passage, respectively.

Japanese Utility Model Application No. 62-56705 microfilm Unexamined-Japanese-Patent No. 2010-150927

  The configuration of Patent Document 2 has a problem that the configuration is complicated and the cost is also increased because a plurality of spacers are required separately from the intake manifold. In this respect, Patent Document 1 forms a blow-by gas passage inside the intake manifold so to speak, so that it can be said that the structure can be simplified and the cost can be suppressed.

  However, in Patent Document 1, only the blow-by gas passage is formed on the mating surface of the two members constituting the intake manifold, and in the internal combustion engine having the EGR gas recirculation function, the EGR gas is separately supplied to each intake passage by a pipe or the like. In the internal combustion engine having the EGR gas recirculation function, there is a problem that the cost is increased.

  The present invention aims to improve such a current situation.

The present invention relates to an intake manifold in which a plurality of intake passages are formed side by side, and in the invention of claim 1, the intake manifold comprises:
"A first member made of synthetic resin in which a plurality of intake passages are at least partially formed, and a second member made of synthetic resin overlapping and welded to the first member from the opposite side of the intake passage the has, on the mating surface between the first member and the second member, and the EGR passage and the blow-by gas passage, are made form an elongated position in a direction transverse to the group of the intake passage,
The first member is provided with an EGR hole for distributing and sending exhaust gas from the EGR passage to each intake passage, and a blowby gas hole for distributing and sending blowby gas from the blowby gas passage to each intake passage. "
It has the composition.

The invention of claim 1 is characterized in that, in the basic configuration,
"The EGR passage and the blow-by gas passage are formed back to back with sandwiching partition ribs which are narrower than the widths of the EGR passage and the blow-by gas passage and which are elongated in the same direction as the two passages."
It has the composition.

In the invention of claim 2, the intake manifold is
"A first member in which the plurality of intake passages are at least partially formed, and a second member overlapping the first member from the opposite side of the intake passage, the first member and the second member An EGR passage and a blow-by gas passage are formed on the mating face with the member in a state of being elongated in the direction crossing the group of the intake passages and adjacent to each other,
The first member is provided with an EGR hole for distributing and sending exhaust gas from the EGR passage to each intake passage, and a blowby gas hole for distributing and sending blowby gas from the blowby gas passage to each intake passage. "
In the basic configuration of
"The inlet of the EGR passage and the inlet of the blowby gas passage are located opposite to each other across the group of the intake passages, and at least one of the EGR passage and the blowby gas passage has an inlet portion. It is formed in the shape of an L that protrudes to the side of the long side edge and is wide and the other passage is close to the long side edge of the one passage, and the end of the passage is the inlet of the one passage. by opposing the two passages has a width of the same extent as the width of the inlet portion of one of the passages as a whole "in
It has the composition.

  In the present invention, the first member and the second member are specified as the components of the intake manifold, but this does not mean that the intake manifold is composed of only two members, but at least two members overlapping each other Is meant to have Therefore, it naturally includes an intake manifold configured by stacking three or more members.

  Further, in the present invention, the intake passage is formed in the first member, but this does not mean that the intake passage is formed only in the first member, and the intake passage is also formed in the second member. It is possible to be formed. That is, at least the first member 1 may be provided with a portion of the intake passage to which at least the EGR gas and the blowby gas are supplied.

  In the present invention, since the blow-by gas passage and the EGR passage are juxtaposed on the mating surfaces of the two members constituting the intake manifold, the blow-by gas and the EGR gas are combined in the internal combustion engine having the EGR function and the blow-by gas return function. The distribution structure of the engine can be simplified to contribute to the cost reduction of the internal combustion engine. Further, since the blow-by gas passage and the EGR passage are also formed inside the intake manifold, the problems of damage and deformation as in the case of providing an external pipe can be avoided.

In addition, since the blowby gas passage and the EGR passage are formed back to back across the elongated partition rib, not only the increase in size of the intake manifold can be prevented, but also the mixing property of the blowby gas and the EGR gas is enhanced and stable. It can also contribute to burning.

In addition, although the first member and the second member are joined by welding using ultrasonic waves or high frequencies, when the blowby gas passage and the EGR passage are arranged back to back via the partition rib as in the present invention , the blowby gas is Since the partition rib separating the passage and the EGR passage is also joined, there is also an advantage that the joining between the members becomes strong.

  Now, in the blowby gas and the EGR gas, the flow rate is much smaller than the amount of intake air (fresh air), so the blowby gas passage and the EGR passage do not require a great cross section, but the inlet It is preferable to have a cross-sectional area of a certain degree in view of the relationship such as providing a buffer function to evenly distribute the gas.

  When the second aspect of the present invention is adopted, the blowby gas passage and the EGR passage can be brought close to each other while widening the inlet part of one or both passages, so that the blowby gas or the EGR gas is evenly distributed. While ensuring the function, the area of the arrangement location of the blowby gas passage and the intake passage can be made as small as possible, which contributes to the downsizing of the intake manifold.

It is a rear view of the intake manifold concerning an embodiment. (A) is an overall side view of the intake manifold, and (B) is an exploded side view. It is a rear view of a 1st member. It is a front view of the 2nd member. (A) is a VA-VA cross-sectional view of FIG. 1 and FIG. 3, (B) is a BB cross-sectional view of (A).

  Next, an embodiment of the present invention will be described based on the drawings. The present embodiment is applied to an intake manifold of a three-cylinder internal combustion engine for a vehicle. Although the directions are shown in the respective drawings, just to be clear, as shown in FIG. 2A, the direction facing the intake side surface of the cylinder head C is defined as a front view, and the vertical direction is the gravity direction It is. 1 and 2 are for the purpose of clarifying the boundaries of the members, and the parallel oblique lines in FIGS. 3 and 4 are for showing a flat surface, and neither is a display of a cross section.

  The intake manifold according to the present embodiment is formed by overlapping and joining first to fourth members 1, 2, 3, 4 made of synthetic resin in the front-rear direction, and has a form incorporating a surge tank. . The outline is described based on FIG. 2 as follows.

  That is, the intake manifold includes a first member 1 having a flange 6 fixed to a cylinder head C, a second member 2 overlapping the first member 1 from the front side, and a third member 3 overlapping the first member 1 from behind The fourth member 4 is overlapped with the second member 2 from the front, and the surge tank 7 is formed between the first member 1 and the second member 2.

  The intake passage 8 of the intake manifold has a form resembling a horn of an instrument in a side view, and roughly, a front curved portion 9 concaved in a backward direction and a back curved in a forward direction in a side view The bending portion 10 and the straight portion 11 that protrudes forward from the lower end of the back bending portion 10 communicate with the upper end of the front bending portion 9 and the upper end of the back bending portion 10. The lower end is open to the surge tank 7.

Furthermore, the front surface of the second member 2 and the front surface of the third member 3 are curved in a forward convex shape, and the front curve 9 is formed between the two by changing the degree of bending of the two. On the other hand, the rear surfaces of the first member 1 and the fourth member 4 are curved in a rearward convex shape in a side view, and the rear curved portion 10 of the intake passage 8 is between them by changing the degree of bending of both. It is formed. Straight portion 11 adjacent are continuous with each other, the flanges 6 provided on the tip end is fixed to the cylinder head C. Most of the straight portion 11 is formed in the first member 1.

  The front curved portion 9 of the intake passage 8 is formed on the mating surface of the second member 2 and the third member 3. Therefore, the start end of the front curved portion 9 opens at the lower end portion of the surge tank portion 7. As shown in FIGS. 3 and 4, the first member 1 and the second member 2 have projecting portions 13 and 14 that project to the left and right sides, and intake is opened forward in the projecting portion 14 of the second member 2 An inlet 15 is provided. As shown in FIG. 1, a boss portion 16 for fixing a throttle body (not shown) is formed at a position of the intake port 15.

  The portion sandwiched between the protruding portion 13 of the first member 1 and the protruding portion 14 of the second member 2 is a part of the surge tank 7. Therefore, the intake air flowing from the intake port 15 into the surge tank 7 flows from below into the front curve 9 and flows upward, and swirls downward from the back by the front curve 9 and the back curve 10, and is directed forward at the lower end Flow into the intake port of the cylinder head C.

The first member 1 and the second member 2 overlap with each other on the lower side of the surge tank 7 and above the rear curved portion 10. In FIGS. 3, 4, 5, etc., the overlapping portions of both members 2, 3 are shown by reference numerals 20, 21. Further, as shown in FIGS. 3 and 4, a blow-by gas passage 18 and an EGR passage 19 are formed on the mating surface of the two overlapping portions 20 and 21. Both passages 18 and 19 is adapted to elongate in form in the lateral direction across the intake passage 8, as EGR passage 19 blow-by gas passage 18 is located above is positioned below, the enclosure ribs 22 and the partition The ribs 23 are formed up and down and back to back.

That is, the blowby gas passage 18 and the EGR passage 19 are located as a whole on the inner side of the laterally long horizontal enclosing rib 22 , and the inside of the surrounding rib 22 is divided up and down by the elongated left and right long longitudinal partition ribs 23, The blowby gas passage 18 and the EGR passage 19 are formed back to back. As clearly shown in FIGS. 3 to 5 (A), the width of the partition rib 23 is much smaller than the widths of the blowby gas passage 18 and the EGR passage 19.
In the embodiment, the enclosing rib 22 and the dividing rib 23 are formed on both of the first member 1 and the second member 2, but these ribs 22 and 23 may be formed of the first member 1 and the second member 2. You may form only in one side among them.

  In the polymerization unit 20 of the first member 1, a blowby gas hole 24 for distributing blowby gas to the back curved portion 10 of each intake passage 8 and for distributing EGR gas to the back curved portion 10 of each intake passage 8 And the EGR holes 25 are open.

  One end (left end) of the EGR passage 19 is a wide inlet 19 a that extends (projects) toward the longitudinal upper end of the EGR passage 19. Therefore, the EGR passage 19 is substantially L-shaped in a front view. On the other hand, the inlet 18a of the blowby gas passage 18 is formed at the other end (left end) opposite to the inlet 19a of the EGR passage 19, and the inlet 18a of the blowby gas passage 18 is It protrudes in the opposite side to the passage 18 and is wide.

  The end of the blowby gas passage 18 faces the inlet 19 of the EGR passage 19. Therefore, the blow-by gas passage 18 and the intake passage 8 are in mesh with each other, and the whole can be made compact. The inlet 18 a of the blow-by gas passage 18 extends toward the opposite side to the EGR passage 19 but protrudes toward the EGR passage 19 so that the end of the EGR passage 19 faces the inlet 18 a of the blow-by gas passage 18 You may

As shown in FIG. 4, in the inlet 18 a of the blow-by gas passage 18 of the second member 2, the blow-by gas inlet 26 is vacant. As shown in FIG. 1, the blowby gas inlet 26 is in the form of a boss projecting rearward, to which a hose is connected via a joint. The blowby gas inlet 26 may be opened sideways, or may be opened downward or upward.

  For example, as shown in FIG. 2, an EGR gas inlet 27 is opened in the left lateral direction at the left end portion of the overlapping portion 21 of the second member 2. The EGR gas inlet 27 is formed on a flange 28 to which an EGR pipe (not shown) is fixed by bolts, and as shown in FIG. 5B, the EGR gas inlet 27 communicates with the EGR passage 19. ing.

In the above configuration, since the blowby gas passage 18 and the EGR passage 19 are disposed upside down with the partition rib 2 , the blowby gas passage 18 and the EGR passage 19 can be collectively arranged in a narrow area. . Therefore, the intake manifold can be made compact.

In the intake manifold forms the intake passage 8 has a surge tank 7 is bent largely as in the present embodiment, the portion becomes a dead space kind between the surge tank portion 7 and the straight portion 11 However, in the present embodiment , the blowby gas passage 18 and the EGR passage 19 can be formed by effectively utilizing this dead space. Therefore, the enlargement of the intake manifold can be suppressed more appropriately.

Further, the blowby gas passage 18 and the EGR passage 19 are located at the end of the back curved portion 10 of the intake passage 8, and the EGR gas and the blowby gas are supplied to the end of the back curved portion 10 of the intake passage 8. Since the EGR gas and the blowby gas have a long distance to reach the intake port of the cylinder head C, the gases can be mixed with each other and also uniformly mixed with fresh air. Further, since the gas discharged from the holes 24 and 25 immediately reaches the straight portion 11 of the intake passage 8, there is an advantage that the gas can be prevented from adhering to the inner surface of the intake passage 8.

  Further, in the blowby gas passage 18 and the EGR passage 19, if the inlets 18a and 19a are formed wide, the inlets 18a and 19a become buffer units for the blowby gas and the EGR gas, and the intake passages 8 are formed. Although the gas can be introduced uniformly, the blow-by gas passage 18 and the EGR passage 19 are vertically meshed with each other, so the height of the intake manifold is not increased (the intake manifold is not enlarged). The EGR passage 19 can be formed with a wide inlet 19 a serving as a buffer.

  In the present embodiment, the blowby gas passages 18 have the same vertical width in the entire length except for the inlet 18a. The blow-by gas has almost no positive pressure and is in a state of being suctioned by suction, so it may be uniform over the entire length like this.

  On the other hand, since the EGR gas has a positive pressure and tends to move toward the end, if the EGR passage 19 has the same width over the entire length, the EGR gas flowing into the EGR hole 25 located at the end is As the proportion increases, there is a possibility that combustion among the cylinders may become uneven. Therefore, in the present embodiment, as shown in FIGS. 3 and 4, the EGR passage 19 has an equal width in the vertical direction from the inlet portion to the middle portion, and the vertical width gradually decreases from the middle portion to the end. As a result, the pressure of the EGR gas at each EGR hole 25 can be equalized, and the inflow of the EGR gas into each EGR hole 25 can be equalized.

  In the present embodiment, a part of the enclosure rib 22 constituting the blowby gas passage 18 and the EGR passage 19 also serves as a partition with the surge tank portion 7. For this reason, while being able to contribute further to compactization, the waste of material can also be prevented.

The present invention can be variously embodied in addition to the above embodiments. For example, application target is not limited to the internal combustion engine of the three-cylinder, it can also be applied to two-cylinder or four-cylinder or an internal combustion engine. The intake manifold does not necessarily have a horn shape as in the embodiment, and a simple type in which the intake passage extends from the box-like surge tank portion toward the cylinder head or a simpler type without the surge tank portion. Can also be applied to various intake manifolds.

  The present invention is practically applicable to the intake manifold. Therefore, it can be used industrially.

C cylinder head 1 first member 2 second member 3 third member 4 fourth member 7 surge tank portion 8 intake passage 9 front curved portion of intake passage 10 back curved portion of intake passage 11 straight portion of intake passage 15 intake inlet 18 Blow-by gas passage 18a Inlet portion of blow-by gas passage 19 EGR passage 19a Inlet portion of EGR passage 20 Overlapping portion of first member 21 Overlapping portion of second member 22 Enclosure rib 23 Partition rib 25 EGR hole 26 Blow-by gas hole

Claims (2)

An intake manifold in which a plurality of intake passages are formed side by side,
A first member made of synthetic resin in which the plurality of intake passages are at least partially formed, and a second member made of synthetic resin overlapping and welded to the first member from the opposite side of the intake passage has, on the mating surface of the first member and the second member, and the EGR passage and the blow-by gas passage, are made form an elongated position in a direction transverse to the group of the intake passage,
It said first member, and the EGR hole for sending to distribute the exhaust gas to the intake passage from the EGR passage, a blow-by gas holes to send to distribute Burobaiga scan to the intake passage from the blow-by gas passage is formed Configuration,
The EGR passage and the blow-by gas passage are formed back to back with sandwiching partition ribs which are narrower than the widths of the EGR passage and the blow-by gas passage and extend in the same direction as the two passages.
Intake manifold. An intake manifold in which a plurality of intake passages are formed side by side,
A first member in which the plurality of intake passages are at least partially formed, and a second member overlapping the first member from the opposite side of the intake passage; the first member and the second member The EGR passage and the blow-by gas passage are formed on the mating face with each other in an elongated posture in the direction crossing the group of the intake passages and adjacent to each other,
The first member is provided with an EGR hole for distributing and sending exhaust gas from the EGR passage to each intake passage, and a blowby gas hole for distributing and sending blowby gas from the blowby gas passage to each intake passage. In the configuration,
The inlet of the EGR passage and the inlet of the blowby gas passage are located opposite to each other across the group of the intake passages, and at least one of the EGR passage and the blowby gas passage is elongated at the inlet portion. It is formed in a wide L-shape projecting to the side of one side edge, and the other passage is close to the longitudinal one side edge of the one passage, and the end is at the inlet of the one passage. By facing each other, the two passages are generally as wide as the width of the inlet of one passage,
Air intake manifold.

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