JP6166130B2 - Intake manifold for internal combustion engine - Google Patents

Description

  The present invention relates to an intake manifold for an internal combustion engine having a branch pipe for supplying air to the internal combustion engine.

  2. Description of the Related Art Conventionally, in a multi-cylinder internal combustion engine such as an automobile, an intake manifold for an internal combustion engine is provided between an intake port of a cylinder head and a throttle valve that adjusts an intake air amount, and the intake sucked into the intake manifold for the internal combustion engine Air is divided and distributed to each intake port. In recent internal combustion engines, exhaust gas, blow-by gas, and the like are recirculated to intake air for the purpose of reducing harmful substances in exhaust gas, and the like, for example, disclosed in Patent Document 1 The intake manifold has a plurality of gas passages connected to each branch pipe, and an introduction portion connected to a gas distribution pipe is provided on the upstream side of the gas passage. And secondary gas (for example, blow-by gas, EGR gas) supplied to the gas distribution pipe is supplied from the gas passage to each branch pipe through the introduction section, so that the secondary gas flows through each branch pipe. It is supplied to the cylinder chamber together with air and burned with fuel.

JP 2004-251163 A

  Generally, the secondary gas circulated to the intake manifold as described above contains moisture, and the internal combustion engine is sucked into the cylinder chamber from each branch pipe through the gas passage while containing the moisture. There is a concern that it may cause misfire when burning.

  The present invention has been made in consideration of the above-described problems, and provides an intake manifold for an internal combustion engine that can capture moisture contained in a secondary gas and prevent entry into the internal combustion engine. For the purpose.

To achieve the above object, the present invention provides an internal combustion engine intake manifold having a plurality of branch pipes, wherein the first divided body and the second divided body are joined to each other via a welded portion.
Between the mating surfaces of the first divided body and the second divided body, a secondary gas passage surrounded by the welding portion and through which the secondary gas flows is formed, and the first divided body faces the secondary gas passage. A concave portion is formed in the welding direction with the second divided body, and the secondary gas passage is formed between the joining surfaces of the welded portions between the two adjacent branch pipes, and the second gas passages of the two adjacent branch pipes are formed. An introduction passage is formed between the first branch passage and the second branch passage, a first secondary gas passage is formed between the introduction passage and the first branch passage, and the introduction passage and the first branch passage are separated from each other. A second secondary gas passage that separates the two is formed between the two branch passages, and the first secondary gas passage and the second secondary gas passage are continuously formed around the introduction passage. It is characterized by.

  According to the present invention, the first and second divided bodies constituting the intake manifold for the internal combustion engine are joined to each other via the welded portion, and the welded portion is interposed between the first divided body and the second divided body. An enclosed secondary gas passage is formed. Moreover, a recessed part is formed in a 1st division body in the welding direction with the 2nd division body which faces a secondary gas channel | path. And when secondary gas distribute | circulates to a secondary gas channel | path, the water | moisture content contained in secondary gas is capture | acquired by the recessed part.

  Accordingly, moisture is captured and suitably removed when passing through the secondary gas passage, so that moisture can be reliably prevented from entering the internal combustion engine and causing misfire.

  In addition, by forming the concave portion on the lower side in the direction of gravity with respect to the secondary gas passage, moisture contained in the secondary gas can be moved from the secondary gas passage to the concave portion under the action of gravity and appropriately captured. It becomes possible.

  Furthermore, by allowing the secondary gas to flow through the secondary gas passage from the lower side to the upper side in the direction of gravity, the water contained in the secondary gas is suppressed from flowing downstream under the action of gravity.

  Furthermore, the recess is formed with a lead-out port that communicates with an introduction passage for supplying air to the branch pipe and leads out the secondary gas from the secondary gas passage, and the lead-out port is provided on the downstream side of the secondary gas passage. Since the outlet port can be located at the uppermost position in the direction of gravity in the secondary gas passage, moisture in the secondary gas supplied from the outlet port into the internal combustion engine through the inlet passage can be more reliably contained in the secondary gas passage. Can be captured and removed.

  According to the present invention, the following effects can be obtained.

  That is, a secondary gas passage surrounded by the welded portion is formed between the first and second divided bodies joined together via the welded portion, and the first divided body faces the secondary gas passage. A recess is formed in the welding direction with the two-part body. And when the secondary gas flows through the secondary gas passage, moisture contained in the secondary gas is suitably removed by being captured by the recess, and the cause of misfire due to moisture entering the internal combustion engine side It can be avoided reliably.

1 is an overall front view of an intake manifold for an internal combustion engine according to an embodiment of the present invention. FIG. 2 is a front view of a manifold body showing a state where a branch pipe cover is removed from the intake manifold for the internal combustion engine of FIG. 1. FIG. 3 is an enlarged front view showing the vicinity of an introduction port in the manifold body shown in FIG. 2. It is sectional drawing along the IV-IV line of FIG.

  A preferred embodiment of an intake manifold for an internal combustion engine according to the present invention will be given and described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates an intake manifold 10 for an internal combustion engine according to an embodiment of the present invention.

  The internal combustion engine intake manifold 10 (hereinafter referred to as an intake manifold 10) is used in, for example, a four-cylinder internal combustion engine having four cylinder chambers mounted on a vehicle or the like.

  As shown in FIGS. 1 and 2, the intake manifold 10 is formed of, for example, a thermoplastic resin and includes a branch pipe 20 having a plurality of first to fourth branch passages 12, 14, 16, and 18. And a suction connection portion 22 provided at one end of the branch pipe 20.

  The branch pipe 20 has, for example, a predetermined dimension in the width direction (arrows A and B directions), and is curved in cross section from one end connected to a surge tank (not shown) to the other end connected to the cylinder head of the internal combustion engine. It is formed into a shape. The branch pipe 20 covers a manifold body (first divided body) 24 having a plurality of first to fourth branch passages 12, 14, 16, and 18 formed therein, and an opening portion of the manifold body 24. And a branch pipe cover (second divided body) 26 constituting a part of the first to fourth branch passages 12, 14, 16, 18. That is, the branch pipe 20 is configured by a divided body including the manifold main body 24 and the branch pipe cover 26.

  Further, in the state where the intake manifold 10 is mounted on the internal combustion engine, the branch pipe 20 has one end portion in the gravity direction (arrow C direction) and the other end portion in the gravity direction (arrow) as shown in FIG. D direction).

  One end of the manifold body 24 is connected to a surge tank (not shown), and is connected to a cylinder head of an internal combustion engine (not shown) via a mounting flange 28 formed at the other end. Has first to fourth branch passages 12, 14, 16, and 18 provided substantially in parallel in the width direction (arrows A and B directions). As shown in FIG. 2, first openings 30 a to 30 d are opened at one end portions of the first to fourth branch passages 12, 14, 16 and 18, respectively, and communicate with a surge tank (not shown). Second openings 32a to 32d are opened at the other ends of the first to fourth branch passages 12, 14, 16, and 18, respectively, and communicate with an intake port of a cylinder head (not shown).

  As shown in FIG. 2, the manifold body 24 surrounds the outer edges of the first to fourth branch passages 12, 14, 16, 18 on the end face (mating face) to which the branch pipe cover 26 is joined. A first welded portion (welded portion) 24a is formed on the end surface of the branch pipe cover 26, and the first welded portion 24a protrudes toward the branch pipe cover 26 when the manifold body 24 and the branch pipe cover 26 are assembled. It is vibration welded in contact with the end face (mating face) of the branch pipe cover 26 and joined to the branch pipe cover 26.

  The manifold main body 24 is formed with an introduction passage 34 that guides the air supplied from the suction connection portion 22 to the surge tank, and one end of the introduction passage 34 is provided through a hole (not shown). The suction connection portion 22 opens, and the other end extends to the one end portion of the manifold body 24 through the second branch passage 14 and the third branch passage 16. The introduction passage 34 communicates with a surge tank (not shown) through an introduction port 36 provided between the pair of first openings 30b and 30c at one end of the manifold body 24. That is, the introduction passage 34 and the introduction port 36 are provided in a substantially central portion along the width direction (arrow A, B direction) of the manifold body 24.

  Further, as shown in FIGS. 2 and 3, the manifold body 24 is formed with a first wall portion 38 that separates both between the introduction passage 34 and the second branch passage 14. A second wall portion 40 is formed between 34 and the third branch passage 16 to separate them. The first and second wall portions 38, 40 are formed in a concave shape at a position between the first opening 30b and the introduction port 36 and between the introduction port 36 and the first opening 30c. First recesses 42a and 42b and second recesses 44a and 44b are formed.

  The first recesses 42a, 42b and the second recesses 44a, 44b are formed, for example, in a rectangular cross section, and the first recesses 42a, 42b are on one end side (in the direction of arrow C) of the manifold body 24, the second recesses 44a, 44b is formed so as to be on the other end side (in the direction of arrow D) spaced apart from the first recesses 42a and 42b by a predetermined distance. In other words, the first recesses 42 a and 42 b and the second recesses 44 a and 44 b are arranged in a straight line along the extending direction of the first and second wall portions 38 and 40.

  The first recess 42b formed on the third branch passage 16 side (arrow B direction) extends toward the introduction passage 34 side (arrow A direction), and the second recess 44b and the introduction port 36 are extended. A gas outlet port 46 is formed. The gas outlet port 46 is formed along the width direction (arrow A, B direction) of the manifold body 24 substantially orthogonal to the extending direction of the second wall portion 40.

  The branch pipe cover 26 is attached to the opening portion of the manifold body 24 so as to close a part of the first to fourth branch passages 12, 14, 16, 18 and the introduction passage 34, and to the manifold body 24. The first to fourth branch passages 12, 14, 16, 18 are mounted so as to be separable in the extending direction (that is, the direction of arrow E in FIG. 4) that intersects the air flow direction.

  The branch pipe cover 26 includes first to fourth cover portions 48, 50, 52, and 54 (see FIG. 1) that cover the first to fourth branch passages 12, 14, 16, and 18, respectively, and the second cover portion 50. And the third cover portion 52, and an introduction cover portion 56 (see FIG. 1) that covers the introduction passage 34. The first to fourth cover portions 48, 50, 52, 54, and the introduction cover portion 56 are provided. Are formed to bulge out in a circular arc shape in a direction away from the manifold body 24.

  The first to fourth cover portions 48, 50, 52, 54 and the introduction cover portion 56 are formed at equal intervals along the width direction (arrow A, B direction) of the branch pipe cover 26.

  In the branch pipe cover 26, a gas introduction port 58 is formed between the third cover portion 52 and the introduction cover portion 56. As shown in FIG. 2, the gas introduction port 58 opens at a position facing the second wall portion 40 of the manifold main body 24 in the branch pipe cover 26, and as shown in FIG. The outer side of the branch pipe cover 26 and the inner side on the manifold body 24 side communicate with each other.

  Then, the secondary gas is supplied through a tube (not shown) connected to the gas introduction port 58. The secondary gas referred to here is, for example, gas supplied to the cylinder chamber of the internal combustion engine through the intake manifold 10 such as blow-by gas or EGR gas.

  The branch pipe cover 26 is provided with second welded portions (welded portions) 60 on end surfaces (mating surfaces) facing the first and second wall portions 38 and 40 of the manifold body 24, respectively. Protrudes toward the manifold body 24 with respect to the end face, and is in contact with the end faces (mating faces) of the first and second wall portions 38 and 40 when the branch pipe cover 26 and the manifold body 24 are assembled. Vibration welding and joining together.

  At this time, a space having a predetermined interval is formed between the end surface of the branch pipe cover 26 and the first and second wall portions 38 and 40 in the manifold body 24, and the space formed on the second wall portion 40 side. Is used as a gas passage 62 surrounded by the first and second welded portions 24a and 60 and through which the secondary gas flows.

  The gas passage 62 extends along the second wall portion 40 from at least a portion facing the gas introduction port 58 to a portion facing the first recess 42 b, and the gas introduction port 58 and the gas outlet port are passed through the gas passage 62. 46 communicates. Then, the secondary gas supplied from the gas introduction port 58 flows to the gas outlet port 46 through the gas passage 62 and then flows into the surge tank through the inlet 36.

  The suction connection portion 22 is provided on the side of the manifold body 24, that is, on one end portion side (in the direction of arrow A) of the manifold body 24, and has, for example, a flange portion 64 connected to a throttle body (not shown). A hole (not shown) is opened in the center of the flange 64, and air whose flow rate is adjusted by the throttle body is supplied to the introduction passage 34 through the hole.

  The intake manifold 10 for an internal combustion engine according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.

  First, air sucked from an intake duct (not shown) is supplied to the introduction passage 34 through the hole of the intake connection portion 22 and is introduced into a surge tank (not shown) through the introduction port 36 of the manifold body 24, and then to the surge tank. Each of the first openings 30a to 30d that are opened is distributed to the first to fourth branch passages 12, 14, 16, and 18 and supplied to the cylinder head.

  At the same time, the secondary gas is supplied to the gas introduction port 58 through a tube (not shown), led out from the gas outlet port 46 into the introduction passage 34 through the gas passage 62, and mixed with the air flowing through the introduction passage 34. Supplied to the cylinder chamber.

  At this time, the secondary gas is introduced into the gas passage 62 from the gas introduction port 58 which is lower in the gravitational direction in the intake manifold 10, and upward (in the direction of arrow C) along the gas passage 62 against the gravitational direction. Therefore, the water contained in the secondary gas is unlikely to reach the gas outlet port 46 opened upward in the direction of gravity, and the first recess 42b provided in the vicinity of the gas outlet port 46. And it will be caught inside by passing the 2nd crevice 44b.

  Specifically, when the secondary gas passes through the first concave portion 42b and the second concave portion 44b, more water is captured by the second concave portion 44b disposed below the gravitational direction (arrow D direction), and the second gas is captured. Moisture that has not been captured by the recess 44b is reliably captured by the first recess 42b. Therefore, it is avoided that moisture is removed in the gas passage 62 and moves to the introduction passage 34 side together with the secondary gas from the gas outlet port 46 opened in the first recess 42b.

  As a result, the moisture contained in the secondary gas is reliably removed inside the gas passage 62 including the first recess 42b and the second recess 44b, thereby preventing the moisture from being discharged to the outside. It is possible to prevent misfire of the internal combustion engine caused by being sucked into the cylinder head from the gas passage 62 together with the secondary gas.

  Further, in the intake manifold 10, since the gas passage 62 uses a space provided between the manifold body 24 and the branch pipe cover 26, it is not necessary to form a new gas passage, thereby reducing the manufacturing cost. be able to.

  Further, the first recess 42b and the second recess 44b for capturing moisture contained in the secondary gas are formed in a dead space between the introduction passage 34 and the second branch passage 14, and the manifold body. Since the lightening part for reducing the weight of 24 is used, it is possible to reduce the manufacturing cost and effectively use the dead space as compared with the case where a concave part for water refilling is newly formed. By doing so, the concave portion does not protrude to the outside of the manifold body 24, so that the intake manifold 10 can be prevented from being enlarged.

  In the above-described embodiment, the gas passage 62 is provided in the second wall portion 40 between the introduction passage 34 and the third branch passage 16 in the manifold body 24, and the first recess 42 b of the second wall portion 40 is provided. Although the case where the gas outlet port 46 is formed has been described, the present invention is not limited to this. The gas passage 62 is provided in the first wall portion 38 between the introduction passage 34 and the second branch passage 14, and The gas outlet port 46 may be formed in the first concave portion 42 a of the one wall portion 38. In this case, the gas introduction port 58 formed in the branch pipe cover 26 is also formed at a position facing the first wall portion 38.

  In the above-described embodiment, as shown in FIG. 4, the first and second recesses 42b and 44b are formed so that the direction in which the first and second recesses 42b and 44b are formed opens in the direction perpendicular to the direction of gravity (arrow C and D). However, the present invention is not limited to this. For example, the bottom surfaces of the first and second recesses 42b and 44b are gradually inclined upward (in the direction of arrow C) toward the opening so that moisture is accumulated in the first and second recesses 42b and 44b. The bottom surfaces of the first and second recesses 42b and 44b may be formed so as to return the water accumulated in the first and second recesses 42b and 44b to the reverse flow direction of the secondary gas. You may form in the taper shape which inclined in the gravity direction downward (arrow D direction) gradually toward the opening part.

  Of course, the intake manifold 10 for an internal combustion engine according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Intake manifold for internal combustion engines 12 ... 1st branch passage 14 ... 2nd branch passage 16 ... 3rd branch passage 18 ... 4th branch passage 20 ... Branch pipe 22 ... Suction connection part 24 ... Manifold body 26 ... Branch pipe cover 30a -30d ... first opening 32a-32d ... second opening 34 ... introducing passage 36 ... introducing port 38 ... first wall 40 ... second wall 42a, 42b ... first recess 44a, 44b ... second recess 46 ... Gas outlet port 58 ... Gas inlet port 62 ... Gas passage

Claims (4)

In the intake manifold for the internal combustion engine, which has a plurality of branch pipes, and the first divided body and the second divided body are joined to each other via a welded portion,
A secondary gas passage surrounded by the welded portion and through which a secondary gas flows is formed between the mating surfaces of the first divided body and the second divided body. A concave portion is formed in the welding direction with the second divided body facing the secondary gas passage, and the secondary gas passage is formed between the joining surfaces of the welding portions between two adjacent branch pipes. A first secondary gas passage in which an introduction passage is formed between the first branch passage and the second branch passage of two adjacent branch pipes, and the both are separated between the introduction passage and the first branch passage. Is formed, and a second secondary gas passage is formed between the introduction passage and the second branch passage, and the first secondary gas passage and the second secondary passage are separated from each other. gas passage intake for an internal combustion engine, characterized in that it is continuously formed around the introduction passage In manifold. The intake manifold for an internal combustion engine according to claim 1,
The intake manifold for an internal combustion engine, wherein the recess is formed below the secondary gas passage in the direction of gravity. The intake manifold for an internal combustion engine according to claim 1 or 2,
An intake manifold for an internal combustion engine, wherein the secondary gas flows through the secondary gas passage from the lower side to the upper side in the direction of gravity. The intake manifold for an internal combustion engine according to any one of claims 1 to 3 ,
The concave portion is formed with a lead-out port that communicates with an introduction passage that supplies air to the branch pipe and that leads out the secondary gas from the secondary gas passage, and the lead-out port is located downstream of the secondary gas passage. An intake manifold for an internal combustion engine, wherein

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