JP5617350B2 - Intake manifold - Google Patents

Description

  The present invention relates to an intake manifold for an internal combustion engine that includes an intake passage for supplying air to a cylinder of the internal combustion engine and an EGR passage that connects an exhaust gas passage and the intake passage of the internal combustion engine.

  An intake manifold of this type of internal combustion engine is provided with an EGR (Exhaust Gas Recirculation) system in which a part of the exhaust gas discharged from the engine is returned to the cylinder and burned again.

  Conventionally, when a part of the exhaust gas is recirculated to the intake manifold, there is a method of branching the EGR flow path to the intake port of each cylinder head using a branch pipe and distributing the exhaust gas to each cylinder (for example, patents). Reference 1).

  In addition, there is a method in which a liquid adhering to the intake manifold is prevented from flowing directly into the EGR flow path by providing a control wall at the junction of the intake flow path and the EGR flow path in the intake manifold (for example, (See Patent Document 2).

JP 9-317579 A Japanese Utility Model Publication No. 5-17148

  However, soot-like carbon-containing particles containing very fine suspended particulate matter (SPM) are present in the high-temperature exhaust gas recirculated to the cylinder head. For this reason, in the intake manifold of the internal combustion engine described in Patent Document 1 and Patent Document 2, deposits are formed on the inner surface of the intake passage by the carbon-containing particles contained in the exhaust gas and the liquid adhering in the intake manifold. Some deposits could be formed. When the deposit is formed, a part of the intake passage is blocked, and there is a problem that non-uniform EGR distribution or a lump forming a part of the deposit enters the combustion chamber and causes a combustion failure.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an intake manifold for an internal combustion engine in which deposits are difficult to be formed on the inner surface of an intake passage.

According to a first aspect of the present invention, there is provided an intake flow path for supplying a fluid containing blowby gas to a cylinder of an internal combustion engine, an exhaust flow path of the internal combustion engine, and the intake flow path. An EGR passage that circulates a part of the exhaust gas from the passage to the intake passage, a fluid supplied from the intake passage, and a flow of exhaust gas supplied from the EGR passage, and the intake passage And a control wall provided at the junction of the EGR flow path and a wall projecting from the wall of the intake flow path upstream of the control wall from the intake flow path and provided in parallel with the control wall. And a guide portion that guides the liquid contained in the cylinder to the cylinder.

The second problem solving means of the present invention is that the guide portion extends longer than the control wall portion in the arrangement direction of a plurality of intake ports that guide fluid to the cylinder.

The third problem solving means of the present invention is that the protruding amount of the portion of the guide portion facing the control wall portion is larger than the protruding amount of the other portion.

A fourth problem-solving means of the present invention is that the guide portion includes a groove that guides liquid to the cylinder.

A fifth problem solving means of the present invention is that the guide portion is provided with a plurality of the guide portions in parallel to the control wall portion upstream of the control wall portion and upstream of the intake passage.

According to the first problem-solving means of the present invention, by providing the guide portion upstream of the control wall portion, oil or gasoline contained in blow-by gas, or liquid such as water condensed in the intake passage, It can suppress entering the EGR flow path side along a control wall part. Therefore, a deposit in which the liquid adhering in the intake passage is blown to the high-temperature exhaust gas recirculated from the EGR passage and solidifying, and the liquid adhering in the intake passage and the carbon-containing particles contained in the exhaust gas, It is possible to suppress deposits that combine, and to prevent the intake passage from being partially blocked. Further, the guide portion protrudes from the wall surface of the intake passage and is provided in parallel with the control wall portion, so that liquid can be scattered from the tip of the protrusion portion and guided in the cylinder direction.

According to the second problem-solving means of the present invention, in the internal combustion engine including a plurality of cylinders, the guide portion extends in the arrangement direction of the plurality of intake ports that guide the fluid to each cylinder, thereby It is possible to guide the liquid adhering to the cylinders evenly by dispersing them along the extended guide part.

According to the third problem-solving means of the present invention, the liquid adhering in the intake passage is biased to some cylinders by increasing the amount of protrusion from the wall surface of the guide portion at the portion facing the control wall portion. Inflow.

According to the fourth problem solving means of the present invention, by providing a groove in the guide portion, it is possible to capture more liquid adhering in the intake flow path and guide it to each cylinder.

According to the fifth problem solving means of the present invention, by providing a plurality of guide portions, it is possible to catch more liquid adhering in the intake flow path and guide it to each cylinder.

Schematic which shows the cross section of the engine and intake device which concern on 1st Embodiment of this invention. Schematic view of the inside of the intake manifold according to the first embodiment of the present invention III-III sectional view of an oil guide concerning a 1st embodiment of the present invention. IV-IV side view of an oil guide according to a modification of the first embodiment of the present invention Schematic which shows the cross section of the intake device which concerns on 2nd Embodiment of this invention. Schematic view of the inside of the intake manifold according to the second embodiment of the present invention

(First embodiment)
FIG. 1 is a cross-sectional view of an engine 1 (internal combustion engine) according to a first embodiment of the present invention, an intake device 10 including an intake manifold 11 and connected to the engine 1, and an exhaust manifold 7 (exhaust flow path). FIG.

  The engine 1 includes a cylinder block 3 in which a plurality of cylinders 2 are provided, and a cylinder head 6 provided with an intake port 4 for air-fuel mixture and an exhaust port 5 for burned exhaust gas. The engine 1 is an in-line four-cylinder engine, and eight intake ports 4 and eight exhaust ports 5 are arranged in series. FIG. 1 shows a cross-sectional view of one cylinder 2, intake port 4, and exhaust port 5. In this embodiment, eight intake ports 4 and eight exhaust ports 5 are provided, but any number that is an integral multiple of the number of cylinders 2 may be used.

  The intake device 10 includes an intake manifold 11 connected to the intake port 4, a throttle valve 12 that controls the amount of fluid containing blowby gas supplied to the intake manifold 11, and an air hose 13 positioned upstream of the throttle valve 12. PCV piping 14 for supplying blow-by gas to the air hose 13, EGR valve 15 for controlling the amount of exhaust gas supplied to the intake manifold 11, and the exhaust manifold 7 downstream of the exhaust port 5 are connected to the EGR valve 15. The EGR pipe 16 is configured.

  The intake manifold 11 includes an intake passage 17 connected to the throttle valve 12, an EGR passage 18 connected to the EGR valve 15, a wall surface 19 at the junction of the intake passage 17 and the EGR passage 18, and a wall surface 19. And an EGR wall 20 (control wall portion, wall portion) for controlling the fluid containing blow-by gas (liquid) sucked from the intake flow path 17 to flow into the EGR valve 15 and the EGR flow path 18; An oil guide 21 (guide portion, suppression portion) provided in parallel with the EGR wall 20 upstream of the intake passage 17 and in parallel. In other words, the EGR wall 20 is provided at a merging portion of the intake passage 17 and the EGR passage 18 and is provided to guide fluid and exhaust gas to each cylinder 2 of the engine 1. In other words, the oil guide 21 is provided to prevent the fluid (liquid such as blow-by gas) flowing through the intake passage 17 from directly hitting the EGR wall 20. The oil guide 21 is provided to prevent liquid such as blow-by gas contained in the fluid from solidifying (generating deposit) by the EGR wall portion 20 heated by the exhaust gas.

  FIG. 2 is a schematic view showing the inside of the intake manifold 11 as viewed from the cylinder head 6 side, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 of the oil guide 21 of the first embodiment of the present invention.

  The oil guide 21 extends longer than the EGR wall 20 in a direction in which eight intake ports provided in series are arranged, and a center portion 22 of the oil guide 21 facing the throttle valve 12 (a portion facing the EGR wall) Is extended (protruded) from the wall surface 19 and is gradually connected from the central portion 22 toward the end portion 23A and the end portion 23B, and has a symmetrical shape with respect to the central portion 22 with an increased amount of protrusion. Further, the tip of the protrusion is referred to as a protrusion direction tip 24.

  The operation and effect of the first embodiment of the present invention will be described. First, the blow-by gas contained in the fluid is unburned gas containing mist-like engine oil and gasoline. Further, in the intake manifold 11 and the air hose 13, condensation occurs on the inner surface when the engine stops and cools.

  The fluid containing these liquids flows from the central portion 22 toward the end portion 23A and the end portion 23B. The liquid is guided to the projecting direction tip 24 while being dispersed to the end portion 23A and the end portion 23B extending from the center portion 22. The liquid guided to the projecting direction tip 24 scatters toward each intake port and is evenly combusted in each cylinder 2, and at the same time, the generation of deposits can be suppressed by reducing the liquid reaching the EGR wall 20. .

  4 is a cross-sectional view taken along line IV-IV in FIG. 2 of an oil guide 21A according to a modification of the first embodiment of the present invention.

  The difference between the oil guide 21A and the oil guide 21 in FIG. 2 is that the oil guide 21A has grooves 25A to 25D extending toward the intake ports 4 on the surface facing the throttle 12.

  The operation and effect of the modification of the first embodiment of the present invention will be described. The fluid sprayed on the oil guide 21A flows into the grooves 25A to 25D and gathers. Then, the liquid guided to the protrusion direction tip 24 of the oil guide 21 </ b> A is scattered toward each intake port 4. The fluid uniformly guided to each cylinder 2 through each intake port 4 burns in the cylinder 2. Therefore, in this invention, the liquid which reaches | attains the EGR wall 20 can be reduced and the production | generation of a deposit can be suppressed.

  In the present embodiment, the shape, depth, number, and the like of the grooves can be changed as appropriate. For example, the groove may extend by being branched into four toward each intake port 4 with the throttle 12 side as one. Further, the two grooves extending to the outer intake port 4 may be provided with wide grooves, and the two extending to the inner intake port 4 may be narrow grooves, and further extend to the outer intake port 4. Only two grooves may be provided. A structure in which liquid is actively guided to the outer cylinder and can be evenly distributed to each cylinder.

(Second Embodiment)
FIG. 5 is a schematic view of a cross section of the intake device 10 connected to the engine 1. The same parts and the same structure as those of the first embodiment will be described using the same reference numerals. The intake manifold 11 includes an intake passage 17 connected to the throttle valve 12, an EGR passage 18 connected to the EGR valve 15, a wall surface 19 at the junction of the intake passage 17 and the EGR passage 18, and a wall surface 19. And an EGR wall 20 that controls the fluid containing blow-by gas that is sucked from the intake passage 17 so as not to flow into the EGR valve 15 and the EGR passage 18, and upstream of the intake passage 17 from the EGR wall 20. And an oil guide 21B provided in parallel, and an oil guide 21C provided between the EGR wall 20 and the oil guide 21B and parallel to the oil guide 21B. In other words, the EGR wall 20 is provided at a merging portion of the intake passage 17 and the EGR passage 18 and is provided to guide fluid and exhaust gas to each cylinder 2 of the engine 1. In other words, the oil guide 21C is provided to prevent the fluid (liquid such as blow-by gas) flowing through the intake passage 17 from directly hitting the EGR wall 20. The oil guide 21 </ b> C is provided to prevent liquid such as blow-by gas contained in the fluid from being solidified (generation of deposit) by the EGR wall portion 20 heated by the exhaust gas.

  FIG. 6 is a schematic view showing the inside of the intake manifold 11 as viewed from the cylinder head 6 side. The oil guide 21B extends longer than the EGR wall 20 in the direction in which the eight intake ports 4 provided in series are arranged, and a central portion 22B of the oil guide 21B that faces the throttle valve 12 (a portion that faces the EGR wall) ) Protrudes in the direction of the throttle valve 12.

  The oil guide 21C extends in a direction in which eight intake ports 4 provided in series are arranged, and a center portion 22C (a portion facing the EGR wall) of the oil guide 21C facing the throttle valve 12 is the throttle valve 12. It extends (protrudes) in the direction. The oil guide 21B and the oil guide 21C are provided in parallel with the EGR wall.

  The operation and effect of the second embodiment of the present invention will be described. The fluid is sprayed onto the oil guide 21B and is distributed from the central portion 22B toward the end portion 23E and the end portion 23F. The liquid adhering to the oil guide 21B is transferred from the central portion 22B to the end portion 23E and the end portion 23F and is guided to the protrusion direction front end 24B. Then, the fluid is sprayed onto the oil guide 21C and is distributed from the central portion 22C toward the end portion 23G and the end portion 23H. Similarly to the oil guide 21B, the liquid adhering to the oil guide 21C is transmitted from the center portion 22C to the end portion 23G and the end portion 23H, and is guided to the protrusion direction tip 24C.

  By providing the oil guide 21B and the oil guide 21C, the liquid that has passed over the oil guide 21B is captured by the oil guide 21C, scattered from the protruding direction tip 24C toward each intake port, and combusted in each cylinder 2. be able to. Therefore, in the embodiment of the present invention, the liquid reaching the EGR wall 20 can be reduced, and deposit generation can be further suppressed.

  In the first and second embodiments of the present invention, an in-line four-cylinder engine is used. However, the present invention is not limited to this and can be applied to other engine types such as an in-line six-cylinder and a V-type six-cylinder.

DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Cylinder 3 ... Cylinder block 4 ... Intake port 5 ... Exhaust port 6 ... Cylinder head 7 ... Exhaust manifold (exhaust flow path)
DESCRIPTION OF SYMBOLS 10 ... Intake device 11 ... Intake manifold 12 ... Throttle valve 13 ... Air hose 14 ... PCV piping 15 ... EGR valve 16 ... EGR pipe 17 ... Intake flow path 18 ..EGR flow path 19 ... wall 20 ... EGR wall (control wall, wall)
21 ... Oil guide (guide part, restraining part)
21A ... Oil guide A
21B ... Oil guide B
21C ... Oil guide C
22 ... Center 22A ... Center A
22B ... Center B
22C ... Center C
23A ... End A
23B ... End B
23C ... End C
23D ... End D
23E ... End E
23F ... End F
23G ... End G
23H ... End H
24 ... Projection direction tip 24B ... Projection direction tip 24C ... Projection direction tip 25A ... Groove A
25B ... Groove B
25C ... Groove C
25D ... Groove D

Claims (5)

An intake passage for supplying fluid containing blowby gas to a cylinder of the internal combustion engine;
An EGR passage that communicates an exhaust passage of the internal combustion engine and the intake passage, and circulates a part of the exhaust gas from the exhaust passage to the intake passage;
A control wall provided at a junction of the intake flow path and the EGR flow path for controlling the flow of the fluid supplied from the intake flow path and the exhaust gas supplied from the EGR flow path;
A guide portion that is provided in parallel with the control wall portion so as to protrude from the wall surface of the intake passage upstream of the control wall portion from the intake passage, and guides a liquid contained in the fluid to the cylinder;
Intake manifold with The intake manifold according to claim 1, wherein the guide portion extends longer than the control wall portion in an arrangement direction of a plurality of intake ports that guide fluid to the cylinder . The intake manifold according to claim 2, wherein a protruding amount of a portion of the guide portion facing the control wall portion is larger than a protruding amount of another portion . The intake manifold according to any one of claims 1 to 3, wherein the guide portion includes a groove that guides liquid to the cylinder . 5. The intake manifold according to claim 1 , wherein the guide portion includes a plurality of the guide portions provided in parallel to the control wall portion upstream of the control wall portion and the intake flow path .

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