JP3601640B2 - Intake device for a multi-cylinder internal combustion engine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intake device for a multi-cylinder internal combustion engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various intake devices have been proposed which utilize a pressure fluctuation generated in an intake passage of each cylinder of a multi-cylinder internal combustion engine to increase a pressure in an intake port portion in the latter half of an intake stroke to obtain a supercharging effect. It is also known that such intake dynamic effects include inertial supercharging and resonance supercharging.
[0003]
In the inertia supercharging, a negative pressure wave from a cylinder in an intake stroke is inverted to a positive pressure wave by an intake expansion section, and supercharging is performed by an intake pushing action by the pressure wave.
[0004]
In resonance supercharging, a plurality of cylinders are divided into a first cylinder group and a second cylinder group in which the intake strokes are not continuous with each other, and each cylinder of the first cylinder group is connected to the first resonance chamber via an independent intake passage. The second cylinder group is also communicated with the second resonance chamber.
Then, the first and second resonance chambers gather in a common collecting chamber via the first and second resonance passages, respectively.
[0005]
With such a configuration, the air column in the first and second resonance passages vibrates due to the pressure wave generated by the periodic opening and closing of the intake port, and this vibration is generated in the first and second resonance chambers and in the independent intake passage. The air vibrates, and when this vibration resonates, the pressure vibration is maximized and a large supercharging is performed.
[0006]
In addition, in a multi-cylinder internal combustion engine, a normal inertial supercharging intake device has an independent intake pipe extending from each cylinder arranged in series, and each independent intake pipe joins a resonance pipe to form an intake manifold. The upstream side of the resonance tube is connected to a throttle body, and further upstream of the throttle body is connected to an air cleaner via an airflow duct.
[0007]
The plurality of independent intake pipes of the intake manifold extend perpendicularly to the cylinder arrangement direction and connect each downstream end to an integral head flange, and the head flange is fixed to a cylinder head of the internal combustion engine body and each upstream end is Is connected to a long-shaped collecting chamber arranged in parallel with the cylinder arrangement direction.
[0008]
A flange for mounting a throttle body is formed at one end of the collective chamber in the cylinder arrangement direction.
Since the cast intake manifold is heavy, a sheet metal intake manifold which is lighter than the cast intake manifold has been recently created.
[0009]
However, the flange surfaces of the head flange and the throttle body flange are orthogonal to each other, and the flange surfaces are formed at distant positions.
Therefore, in a multi-cylinder internal combustion engine, it has been conventionally proposed to integrally form a head flange and a throttle body flange with an L-shaped bent casting flange, as disclosed in Japanese Patent Application Laid-Open No. 2-95757. There is a description.
[0010]
[Problems to be solved by the invention]
Even if the independent intake pipe and the collecting chamber are made of sheet metal such as wrought material, the head flange and the throttle body flange are integrally formed, but they are made of cast metal, so they are heavy, and naturally have a weight in the internal combustion engine body. Strength is also required for connection.
The flange for mounting the throttle body is also vertically separated from the head flange extending in the cylinder arrangement direction, and by integrally connecting the two flanges, an L-shaped bent flange is formed.
[0011]
The throttle body is attached to the throttle body flange bent in an L-shape with respect to the head flange, and is supported separately from the internal combustion engine body. However, the throttle body is heavy, and the heavy body is attached to the internal combustion engine body. Are supported apart from each other, so that a large fastening force of the head flange to the internal combustion engine body is required.
[0012]
In an internal combustion engine that performs EGR, an exhaust gas recirculation device generally performs EGR gas downstream of a throttle valve to take in EGR gas into intake air. By arranging, the space in the intake manifold can be effectively used.
[0013]
The present invention has been made in view of such a point, and the object thereof is to make the intake manifold itself of a resonance supercharged type having a long intake passage length strong, and to form the intake manifold in a compact manner, It is an object of the present invention to provide an intake device for a multi-cylinder internal combustion engine in which a throttle body and an EGR valve to be attached are arranged at a position close to the internal combustion engine so that a space in the intake manifold can be effectively used.
[0014]
Means and action for solving the problem
To achieve the above object, the present invention provides an independent intake pipe having a downstream end connected to a head flange connected to a cylinder head of a multi-cylinder internal combustion engine and extending perpendicularly to a cylinder arrangement direction; A resonance chamber that joins the upstream end, and a resonance pipe that connects the upstream end to a throttle body flange connected to the throttle body, bends in an L-shape, then extends parallel to the cylinder arrangement direction, and connects the downstream end to the resonance chamber. In the intake device for a multi-cylinder internal combustion engine, the head flange and the throttle body flange are integrally formed so as to extend in the cylinder arrangement direction via a connecting portion, and EGR is provided near the head flange of the connecting portion. The intake device of a multi-cylinder internal combustion engine having a valve was used.
[0015]
In an intake apparatus having a structure in which an upstream end is connected to a throttle body flange and then bent in an L-shape to extend in parallel with the cylinder arrangement direction and a downstream end thereof is connected to a resonance chamber where an independent intake pipe joins. Since the flange and the throttle body flange extend in the cylinder arrangement direction via the connection part and are integrally formed, a structurally strong and rigid intake system mounting structure can be achieved, making it possible to reduce the weight and size. is there.
[0016]
Since the throttle body flange is formed integrally on substantially the same plane as the head flange, it is possible to maintain high quality accuracy and durability reliability of the throttle body attached to the throttle body flange against vibration of the internal combustion engine.
By mounting the components of the intake device, the throttle body, and the EGR valve for maintaining high quality accuracy and durability reliability at a position close to the internal combustion engine that is the vibration source, it is possible to suppress the vibration caused by the vibration of the internal combustion engine.
[0017]
Since the EGR valve is disposed at the connection between the head flange and the throttle body flange, the EGR valve is disposed by utilizing the excess space between the independent intake pipe and the resonance pipe, and the space can be used effectively.
Further, since the EGR valve is arranged near the head flange of the connecting portion, an appropriate length of the EGR gas passage from the EGR valve to the downstream of the throttle body can be secured to cool the EGR gas by the outside air.
[0018]
Further, the four cylinders of the in-line four-cylinder internal combustion engine are divided into two cylinder groups whose intake strokes are not continuous with each other, and the downstream end is connected to a head flange connected to the cylinder head to communicate with each cylinder and to be perpendicular to the cylinder arrangement direction. The first, second, third, and fourth independent intake pipes extending to each other and the upstream ends of the first, second, third, and fourth independent intake pipes are assembled for each of the cylinder groups. The first and second resonance chambers, the first and second resonance pipes each extending upstream from the first and second resonance chambers and formed in an L shape, and the first and second resonance pipes are assembled. In an intake device for a four-cylinder internal combustion engine in which an upstream end of the collective chamber is connected to a collective chamber and a throttle body flange connected to a throttle body, the head flange and the throttle body flange are connected to each other via a connecting portion. Extends in the arrangement direction and is integrally formed And an EGR valve is disposed on the intake device side near the head flange of the connecting portion, and an EGR gas pipe having one end connected to the EGR valve extends from the internal combustion engine body side of the connecting portion and is connected to the collecting chamber. An intake device for a multi-cylinder internal combustion engine having the ends connected was used.
[0019]
A head flange in which an intake manifold composed of each independent intake pipe, first and second resonance chambers, first and second resonance pipes, and a collection chamber has a U-shape, and the intake manifold extends in the cylinder arrangement direction; And the throttle body flange are attached to an integrally formed body that is substantially flush with each other, so that the overall configuration is a square shape, and the four ends without open ends are connected to each other so that both ends of each side are , It is possible to make up one strength structure, and it is possible to easily secure high strength and rigidity structurally, so that each member can be reduced in weight and simplified, and overall compact And a simple structure.
[0020]
Since the EGR valve is arranged on the intake device side of the connecting portion, the space can be effectively used by utilizing the excess space of the intake manifold.
Also, the EGR valve is disposed near the head flange of the connecting portion and is separated from the collecting chamber connected to the throttle body flange by an appropriate distance, and the EGR gas pipe is connected to the EGR valve and the collecting chamber. The EGR gas can be cooled by the outside air by exposing it to an appropriate length.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described below with reference to FIGS.
The vehicle 1 according to the present embodiment is an FF (front engine front drive) vehicle, and FIG. 1 is a schematic side view showing an arrangement state of an internal combustion engine 10 at a front portion of the vehicle body.
[0022]
In the engine room 3 below the bonnet 2, an in-line four-cylinder internal combustion engine 10 is mounted horizontally between a front radiator 4 and a rear dashboard 5, and a cylinder block in which cylinders are arranged in series 11 is inclined backward.
An intake manifold 20 extends forward from the cylinder head 12 above the inclined cylinder block 11, and an exhaust manifold 18 extends rearward.
[0023]
The intake manifold 20 has a structure in which intake air is supercharged. FIGS. 2 to 4 are a plan view, a front view, and a side view showing the intake manifold 20 downstream of the throttle body.
[0024]
Assuming that four cylinders of the in-line four-cylinder internal combustion engine 10 mounted laterally with respect to the vehicle body are first, second, third, and fourth cylinders in order from the right side, the first cylinder and the fourth cylinder perform the intake stroke. , And the second cylinder and the third cylinder similarly constitute another cylinder group in which the intake stroke is not continuous.
[0025]
From the cylinder head 12 of the in-line four-cylinder internal combustion engine 10, first, second, third, and fourth independent intake pipes 21, 22, 23, and 24 are provided in front of the first, second, third, and fourth cylinders, respectively. Extending to
The four independent intake pipes 21, 22, 23, and 24 have their base ends fitted to the head flange portion 14 of the common horizontally long plate-like flange plate 13, and are welded to be connected to the cylinder head 12.
[0026]
The first, second, third, and fourth independent intake pipes 21, 22, 23, and 24 extend obliquely upward and forward from the flange plate 13, and among them, the first, second, and third independent intake pipes 21, 22, are included. , 23 are curved in an inverted U-shape in side view so as to hold a space below. The first independent intake pipe 21 is connected to the upper surface of the first resonance chamber 31, and the second and third independent intake pipes 22, 23 is connected to the upper surface of the second resonance chamber 32.
[0027]
The first resonance chamber 31 is disposed substantially in front of the second cylinder in a front-rear long posture oriented in a direction perpendicular to the cylinder arrangement direction, and the rear half (cylinder head side) of the second resonance chamber 31 bulges upward. The first upper surface 31a is located at a lower position than the rear upper surface 31b, and the first independent intake pipe 21 is connected to the lower front upper surface 31a.
[0028]
The second resonance chamber 32 is in a left and right long position oriented parallel to the cylinder arrangement direction, is disposed substantially in front of the third cylinder, and is in contact with the front half side surface of the first resonance chamber 31. Second and third independent intake pipes 22, 23 are connected to the upper surface 32a of the second resonance chamber 32 side by side.
[0029]
Since the upper surface 31a of the first half of the first resonance chamber 31 and the upper surface 32a of the second resonance chamber 32 are located side by side at substantially the same height, the first, second, and third independent intake pipes 21, 22, 23 are The upstream end is arranged right and left close to the upper surfaces 31a and 32a of the first and second resonance chambers 31 and 32, and is curved in an inverted U-shape, and the downstream end is formed on the same long surface on the left and right sides of the flange plate 13. They are arranged and have substantially the same path length with a curved shape having substantially the same curvature.
[0030]
Then, the fourth independent intake pipe 24 extends obliquely upward and forward from the flange plate 13, then curves in an inverted U-shape in a side view so as to hold a space below and obliquely to the right (toward the vehicle traveling direction). And the space below the inverted U-shaped curved portion formed by the second and third independent intake pipes 22 and 23 along the rear side (the flange plate 13 side) of the second resonance chamber 32. The first resonance chamber 31 is connected to a portion that protrudes upward from the left side of the rear half of the first resonance chamber 31.
The four first, second, third, and fourth independent intake pipes 21, 22, 23, and 24 have substantially equal passage lengths and curvatures of the curved portions.
[0031]
Then, the first resonance pipe 41 extends in parallel with the flange plate 13 from the lower part (the upper part of which the fourth independent intake pipe 24 is connected) of the left side of the rear half of the first resonance chamber 31, and the fourth independent upper part of It is inclined obliquely upward from a point past the intake pipe 24, bent substantially L-shaped rearward, and connected to the right side of the collective chamber 50.
[0032]
A second resonance tube 42 extends from the left side surface of the second resonance chamber 32 in parallel with the flange plate 13, inclines obliquely upward from the middle along the first resonance tube 41, and bends backward in an L-shape. And is connected to the left side of the collecting room 50.
[0033]
The flange plate 13 is slightly twisted leftward and slightly upward from the right head flange portion 14 to which the first, second, third, and fourth independent intake pipes 21, 22, 23, and 24 are connected. The throttle body flange portion 16 is formed at the left end via the extended connecting portion 15 and is an integrally formed plate made of sheet metal and elongated in the left-right horizontal direction.
[0034]
The upstream of the collecting chamber 50 is connected to the throttle body flange 16 at the left end of the flange plate 13, and the downstream branching left and right adjacent to the front is connected to the first and second resonance tubes 41 and 42. You.
The passage length of the second resonance tube 42 is slightly shorter than that of the first resonance tube 41.
[0035]
When the flange plate 13 is attached to the cylinder head 12, the collecting chamber 50 fixed to the throttle body flange 16 is connected to the throttle body, and an air cleaner is connected to the upstream side of the throttle body via an airflow duct.
[0036]
The first resonance chamber 31 and the second resonance chamber 32 adjacent to the left and right are communicated with each other by a communication pipe 33 at a lower portion, and the communication pipe 33 swells left and right to have a relatively large capacity.
[0037]
An opening / closing valve 34 is provided at a communication port of the communication pipe 33 with the first resonance chamber 31 so as to be openable and closable so that the first resonance chamber 31 and the second resonance chamber 32 can be appropriately blocked or communicated through the communication pipe 33. It has become.
[0038]
The second resonance pipe 42 has a slightly shorter passage length than the first resonance pipe 41, but the second resonance chamber 32 to which the second resonance pipe 42 is connected also has a capacity of the communication pipe 33 which is always in communication therewith. If this is included, a sufficient volume is secured and the first and second resonance tubes 41 and 42 are equal in length, so that the resonance frequencies (resonance points) of the first resonance tube 41 and the second resonance tube 42 are the same. It can be.
[0039]
The on-off valve 34 is a butterfly valve that is fixed to a valve shaft 35 and turns. The valve shaft 35 that is rotatably supported is connected via a link mechanism 37 to an operating portion of a diaphragm 36 protruding from the head flange 13 side. Have been.
[0040]
The diaphragm 36 is operated in accordance with the operation state of the internal combustion engine 10. In a low to middle rotation range of the internal combustion engine 10, the switching valve 34 is closed to communicate the first resonance chamber 31 and the second resonance chamber 32. In the high rotational speed range, the switching valve 34 is opened, the first resonance chamber 31 and the second resonance chamber 32 communicate with each other, and the large cylinder including the communication pipe 33 is closed. A volume is formed and inertial supercharging is performed.
[0041]
As described above, the first, second, third, and fourth independent intake pipes 21, 22, 23, and 24 of the intake manifold 20 are attached to the right head flange portion 14, and the collecting chamber 50 is attached to the left throttle body flange portion 16. The flange plate 13 is provided with an EGR valve 60 for controlling the flow rate of the EGR gas near the head flange portion 14 at the connecting portion 15 therebetween, adjacent to and in parallel with the fourth independent intake pipe 24, and a throttle body flange portion 16. A rectangular ventilation hole 15a is formed on the side.
[0042]
An injector mounting hole 14a is formed above each mounting portion of each of the independent intake pipes 21, 22, 23, 24 of the head flange portion 14.
A connecting pipe 65 for a water passage is provided projecting obliquely below the EGR valve 60 of the connecting portion 15.
[0043]
An EGR port 15b communicating with the exhaust port is formed in a portion of the connecting portion 15 where the EGR valve 60 is fixed, in a range where the EGR valve 60 is sealed via a gasket with the cylinder head 12 (see FIG. 5). There is an outlet port outside the side seal area, from which the EGR gas pipe 61 extends rearward, bends laterally and passes through the rear side of the ventilation hole 15a to form the throttle body flange 16. The lower side is turned forward to connect the end to the lower surface of the collecting chamber 50 to communicate the inside of the EGR gas passage.
[0044]
The intake system of the in-line four-cylinder internal combustion engine 10 has the above-described structure, and the intake manifold 20 is provided with a first plate and a first plate. The second, third, and fourth independent intake pipes 21, 22, 23, and 24 extend forward from the head flange portion 14, and pass through the first and second resonance chambers 31, 32 to form the first and second resonance pipes 41, 42. Reference numeral 42 extends in parallel with the flange plate 13 and bends into an L-shape, assembles in the collecting chamber 50, and is connected to and attached to the throttle body portion 16. The flange plate 13 has one side in the plan view shown in FIG. The first, second, third, and fourth independent intake pipes 21, 22, 23, and 24 each have another side, and the first and second resonance chambers 31 and 32 that are bent into an L shape have other two sides. The square-shaped structure has four open ends without open ends. Both end portions of each side by concatenating from being supported by the other side, it is possible to create a single strength structure can be secured structurally high strength and rigidity.
[0045]
Therefore, it is not necessary to increase the thickness of the flange plate 13 to which the intake manifold is attached or to form a complicated fitting structure of the attachment portion, so that the intake manifold is made compact with a light and simple structure.
[0046]
The throttle body attached to the throttle body flange portion 16 of the flange plate 13 is about 1.3 kg in weight, and in order to ensure high quality accuracy and durability reliability, high strength against vibration of the internal combustion engine 10 is required. Although a rigid mounting structure is required, in this embodiment, the throttle body is mounted on the throttle body flange portion 16 of the flange plate 13 which is substantially flush with the head flange portion 14, and as described above, Since one of the sides has a substantially rectangular shape and the strength and rigidity are kept high, high quality accuracy and durability reliability of the throttle body can be easily secured.
[0047]
Although the EGR valve 60 also weighs about 0.47 kg, it is attached to the flange plate 13 like the throttle valve, so that quality accuracy and durability reliability can be maintained.
[0048]
Since the EGR valve 60 projects forward from the connecting portion 15 of the flange plate 13, the EGR valve 60 is disposed in a surplus space between the fourth independent intake pipe 24 and the first resonance pipe 41 to effectively use the space. it can.
[0049]
Further, since the EGR valve 60 is mounted near the head flange portion 14 of the connecting portion 15, an EGR gas extending from the EGR valve 60 to the collecting chamber 50 at an appropriate distance between the EGR valve 60 and the throttle body flange portion 16 is provided. An appropriate and sufficient length is secured without complicating the pipe 61, and the EGR gas can be cooled by the outside air.
[0050]
Since the EGR gas pipe 61 passes behind the ventilation hole 15a formed in the connecting portion 15, the traveling wind directly hits the EGR gas pipe 61, and the cooling effect of the EGR gas is high.
The position where the EGR gas is released to the intake is not limited to the collecting chamber 50.
[0051]
【The invention's effect】
The present invention provides a structure in which a head flange and a throttle body flange are integrally formed so as to extend in a cylinder arrangement direction via a connecting portion, and an intake manifold is attached to the overall structure to form a substantially rectangular shape. The installation structure of the intake system with high rigidity makes it possible to reduce the weight and size.
[0052]
Since the throttle body flange is formed integrally on substantially the same plane as the head flange, it is possible to maintain high quality accuracy and durability reliability of the throttle body attached to the throttle body flange against vibration of the internal combustion engine.
[0053]
The EGR valve is arranged by utilizing the extra space between the independent intake pipe and the resonance pipe, and the space can be used effectively.
In addition, since the EGR valve is arranged near the head flange of the connecting portion, it is possible to secure a sufficient length of the EGR gas passage from the EGR valve to the downstream of the throttle body, thereby cooling the EGR gas by the outside air.
[0054]
By constructing as in the above-mentioned claim 2 and piping the EGR gas pipe having a sufficient length, the EGR gas can be effectively cooled by the outside air.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an arrangement state of an internal combustion engine in a front portion of a vehicle body of an automobile according to an embodiment of the present invention.
FIG. 2 is a plan view of an intake manifold of the internal combustion engine.
FIG. 3 is a front view of the same.
FIG. 4 is a side view of the same.
FIG. 5 is a rear view of a throttle body flange portion of the flange plate.
[Explanation of symbols]
1 ... car, 2 ... bonnet, 3 ... engine room, 4 ... radiator, 5 ... dashboard,
DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Cylinder block, 12 ... Cylinder head, 13 ... Flange plate, 14 ... Head flange part, 15 ... Connection part, 16 ... Throttle body flange part, 18 ... Exhaust manifold,
20: intake manifold, 21: first independent intake pipe, 22: second independent intake pipe, 23: third independent intake pipe, 24: fourth independent intake pipe
31: first resonance chamber, 32: second resonance chamber, 33: communication pipe, 34: open / close valve, 35: valve shaft, 36: diaphragm, 37: link mechanism,
41: first resonance tube, 42: second resonance tube,
50… Meeting room,
Reference numeral 60: EGR valve, 61: EGR gas pipe, 65: connection pipe.

Claims (2)

An independent intake pipe connecting the downstream end to a head flange connected to a cylinder head of a multi-cylinder internal combustion engine and extending vertically in the cylinder arrangement direction;
A resonance chamber that joins the upstream end of the independent intake pipe;
A multi-cylinder internal combustion engine comprising: a resonance pipe having an upstream end connected to a throttle body flange connected to a throttle body and then bent in an L-shape to extend parallel to the cylinder arrangement direction and connect a downstream end to the resonance chamber. In the device,
The head flange and the throttle body flange are integrally formed by extending in the cylinder arrangement direction via a connecting portion,
An intake device for a multi-cylinder internal combustion engine, wherein an EGR valve is arranged near a head flange of the connecting portion. The four cylinders of the in-line four-cylinder internal combustion engine are divided into two cylinder groups whose intake strokes are not continuous with each other,
First, second, third, and fourth independent intake pipes each having a downstream end connected to a head flange connected to the cylinder head, communicating with each cylinder, and extending perpendicularly to the cylinder arrangement direction;
First and second resonance chambers in which the upstream ends of the first, second, third, and fourth independent intake pipes merge for each of the cylinder groups;
First and second resonance tubes each extending upstream from the first and second resonance chambers and formed in an L-shape;
A collecting chamber in which the first and second resonance tubes collect;
An intake device for a four-cylinder internal combustion engine, wherein an upstream end of the collective chamber is connected to a throttle body flange connected to a throttle body,
The head flange and the throttle body flange are integrally formed by extending in the cylinder arrangement direction via a connecting portion,
An EGR valve is arranged on the intake device side near the head flange of the connection portion,
An intake apparatus for a multi-cylinder internal combustion engine, wherein an EGR gas pipe having one end connected to the EGR valve extends from the internal combustion engine body side of the connection portion and the other end is connected to the collecting chamber.

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