JP2017066873A - Intake supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake supply device for improving the efficiency of cooling compressed air while suppressing the generation of condensed water therein.SOLUTION: An intake supply device 10 includes an intake manifold 14 for distributing air into an internal combustion engine 12, and an intercooler 16 stored in the intake manifold 14. The intake manifold 14 has an introduction part 24 upstream of the intercooler 16, including a first passage 30 connected to a throttle body 18 and having an approximately constant passage cross section area all the way, and a second passage 32 connected to the downstream side of the first passage 30 and having a passage cross section area gradually increasing in the longitudinal direction of the intercooler 16. Into the introduction part 24, the air is introduced gradually in a wider range over the longitudinal direction of the intercooler 16 as the air flows from the first passage 30 to the second passage 32. The air applied over the whole surface of the intercooler 16 passes therethrough, resulting in heat exchange.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intake air supply device including a supercharger and an intercooler for supplying compressed air to an internal combustion engine.

  2. Description of the Related Art Conventionally, in a multi-cylinder internal combustion engine such as an automobile, as disclosed in Patent Document 1, an intake air supply device that is connected to an intake port of a cylinder head and distributes and supplies air is used. This intake air supply device is provided with a throttle valve for adjusting the amount of air sucked upstream of the housing, and a supercharger capable of supplying compressed air using exhaust gas further upstream of the throttle valve Is provided.

  An intercooler for cooling the supercharged air introduced from the supercharger is built in the housing.

  Then, after the supercharged air is introduced into the inside of the housing through the intake passage connected to the throttle valve on the upstream side of the housing and cooled by passing through the intercooler, a plurality of downstream airs are provided. Is distributed to each intake port of the internal combustion engine through the branch pipe.

Special table 2014-532146 gazette

  However, in the intake air supply device as described above, there is a portion where the passage cross-sectional area of the intake passage on the upstream side of the intercooler is abruptly reduced, and the air is compressed when flowing through this narrowed portion, There is a concern that moisture contained in the air becomes condensed water and is sucked into the internal combustion engine together with the air. Thus, the condensed water enters the internal combustion engine and causes misfire.

  Further, on the upstream side of the intercooler, since the distance from the constricted part of the intake passage to the intercooler is short, the air that has passed through the constricted part goes straight and hits only a part of the intercooler, and the supercharged air There is a problem that the cooling efficiency cannot be sufficiently cooled.

  The present invention has been made in consideration of the above-described problems, and an object thereof is to provide an intake air supply device that can suppress the generation of condensed water inside and improve the cooling efficiency of air. .

In order to achieve the above object, the present invention provides a supercharger that supplies air compressed by exhaust gas discharged from an internal combustion engine, a throttle body that controls the amount of intake air to the internal combustion engine, and a throttle body An intake manifold connected to the downstream side of the intake manifold having an intercooler housing portion containing the intercooler, and for introducing air into the internal combustion engine,
The throttle body is disposed in the vicinity of the supercharger, and the intake manifold and the throttle body are connected so as to straddle the upper part along the direction of gravity in the internal combustion engine.
The intercooler is arranged so as to be on the opposite side of the supercharger across the internal combustion engine, and the uppermost position thereof is arranged below the passage in the throttle body in the gravity direction,
The upstream passage of the intercooler in the intake manifold has a first passage portion continuously formed with a substantially constant passage cross-sectional area from a connection portion with the throttle body,
A second passage portion that is joined to the downstream side of the first passage portion, the passage cross-sectional area is enlarged in the longitudinal direction of the intercooler, and is connected to the intercooler housing portion at the largest passage cross-sectional area;
It is characterized by having.

  According to the present invention, in the intake air supply device that guides the air compressed by the supercharger to the inside of the internal combustion engine, the throttle body is disposed in the vicinity of the supercharger and straddles the upper part of the internal combustion engine along the direction of gravity. The throttle body and the intake manifold are connected to each other, and the intercooler is arranged inside the intake manifold so as to be opposite to the supercharger across the internal combustion engine, and the upstream side passage of the intercooler in the intake manifold is connected to the throttle body. A first passage portion formed continuously with a substantially constant passage cross-sectional area from the connection portion with the first passage portion, and a passage which is joined to the downstream side of the first passage portion and has a largest passage cross-sectional area in the longitudinal direction of the intercooler. And a second passage portion connected to the intercooler housing portion in cross-sectional area.

  Accordingly, the upstream side passage to the intercooler can be secured longer than the intake air supply device according to the prior art because of the positional relationship between the intercooler and the throttle body, and the downstream side of the upstream side passage is the intercooler side. By configuring the second passage portion to gradually increase the passage sectional area with respect to the first passage portion, the air flow direction can be gently deflected toward the downstream side.

  As a result, a sudden pressure change in the intake manifold is prevented, the generation of condensed water due to the pressure change is prevented, and the contact range when the air passes through the intercooler can be expanded. The cooling efficiency can be improved.

  In addition, by forming the upstream passage composed of the first and second passage portions longer than the downstream passage on the downstream side of the intercooler, it is easy to optimize the shape of the upstream passage, and the air passes through the intercooler. Therefore, the air cooling efficiency can be further improved, the intake efficiency of the internal combustion engine can be increased, and the performance of the internal combustion engine can be improved.

  Further, the throttle body is provided with a throttle valve that adjusts the amount of intake air to the internal combustion engine so that it can be opened and closed, and the lower end portion along the direction of gravity of the drive source that drives the throttle valve is mounted on the internal combustion engine. Since the throttle body and the member disposed at the top of the internal combustion engine can be overlapped with each other, the intake air supply can be performed. The device can be miniaturized in the direction of gravity (height direction).

  Furthermore, by holding the throttle body in the internal combustion engine via an attachment member sandwiched between the intake manifold and the throttle body, it is possible to reliably fix the relatively heavy throttle body to the internal combustion engine. Therefore, the vibration can be prevented.

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

  That is, in the intake air supply device that guides the air compressed by the supercharger to the inside of the internal combustion engine, the throttle body is disposed in the vicinity of the supercharger and straddles the upper part along the direction of gravity in the internal combustion engine. And the intake manifold, the intercooler is placed inside the intake manifold so that it is on the opposite side of the supercharger across the internal combustion engine, and the upstream side passage of the intercooler in the intake manifold is connected to the throttle body. A first passage portion continuously formed with a substantially constant passage cross-sectional area from the portion, and a passage cross-sectional area that is joined to the downstream side of the first passage portion and that extends in the longitudinal direction of the intercooler, and has a maximum passage cross-sectional area By configuring the intercooler storage part and the second passage part connected to the intercooler storage part, Compared with the intake air supply device, it is possible to ensure a long upstream passage to the intercooler, and further, in the upstream passage, the second passage portion on the downstream side is gradually increased in cross-sectional area with respect to the first passage portion. Thus, the air flow direction can be gently deflected toward the downstream side.

  As a result, a sudden pressure change in the intake manifold is prevented, the generation of condensed water due to the pressure change is prevented, and the contact range with the intercooler when air passes can be expanded. Air cooling efficiency can be improved.

1 is a partially omitted overall cross-sectional view showing an intake air supply device according to an embodiment of the present invention and an internal combustion engine in which the intake air supply device is mounted. FIG. 2 is a front view of the intake air supply device and the internal combustion engine shown in FIG. 1. It is a schematic explanatory drawing which shows the flow of the air in an intake manifold.

  A preferred embodiment of an intake air supply device according to the present invention will be described below and described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates an intake air supply apparatus according to an embodiment of the present invention.

  The intake air supply device 10 is used in, for example, a three-cylinder internal combustion engine 12 having three cylinder chambers mounted on a vehicle or the like. As shown in FIGS. 1 and 2, for example, the internal combustion engine 12, an intake manifold 14 for distributing and supplying air, an intercooler 16 accommodated in the intake manifold 14, a throttle body 18 provided on the upstream side of the intake manifold 14 for adjusting the amount of air, and the throttle And a supercharger 20 that is provided on the upstream side of the body 18 and supplies compressed air using the exhaust gas generated in the internal combustion engine 12. The intake air supply device 10 is provided so as to surround the upper portion of the head cover 22 provided in the upper direction of gravity (in the direction of arrow A1) in the internal combustion engine 12.

  The intake manifold 14 is formed of, for example, a resin material and is provided in the downstream side of the chamber portion 26, the introduction portion 24 that is tubular and extends in a straight line, the chamber portion 26 connected to the introduction portion 24, and the like. And a lead-out portion 28 connected to each intake port of the internal combustion engine 12.

  As shown in FIGS. 1 to 3, the introduction portion 24 is connected to the first passage portion 30 formed on the upstream side thereof and having a substantially constant passage cross-sectional area, and to the downstream side of the first passage portion 30. The passage cross-sectional area includes a second passage portion 32 that gradually increases toward the downstream side.

  The first passage portion 30 is formed so as to be substantially in the center in the width direction in the intake manifold 14, and the second passage portion 32 extends symmetrically with respect to the first passage portion 30 on both sides in the width direction. Formed with.

  The passage length (for example, center line length) L1 of the introduction portion 24 composed of the first and second passage portions 30 and 32 described above is the passage length of the lead-out portion 28 formed on the downstream side of the chamber portion 26. It is formed longer than the length L2 (L1> L2).

  A throttle body 18 that controls an intake air amount to the internal combustion engine 12 is connected to an end portion on the upstream side of the first passage portion 30 via a first flange portion 34. On the other hand, the second passage portion 32 extends so as to gradually expand in the width direction (arrow B direction) of the intake manifold 14 toward the downstream side, and the downstream end thereof is formed in a box shape. The unit 26 is connected.

  The first passage portion 30 continuously extends with a substantially constant passage cross-sectional area from a portion connected to the throttle body 18 to a joint portion with the second passage portion 32.

  The throttle body 18 has a flow path (passage) 38 penetrating through a housing 36 made of, for example, a metal material, and a disk-like throttle valve 40 is opened and closed via a shaft 42 in the flow path 38. It is provided freely. Further, a drive source 44 composed of, for example, a DC motor is provided below the housing 36 in the gravitational direction (arrow A2 direction). An electric signal from an engine control unit (ECU) (not shown) is input to the drive source 44, whereby the rotational driving force of the drive source 44 is transmitted to the throttle valve 40 via the shaft 42. Open and close by a predetermined angle.

  Further, as shown in FIG. 1, the lower end portion 44 a of the drive source 44 is disposed so as to be downward (in the direction of arrow A <b> 2) with respect to the head cover 22 that is disposed at the uppermost position in the gravity direction in the internal combustion engine 12. (See the two-dot chain line in FIG. 1).

  Further, the supercharger 20 is connected to the upstream side of the throttle valve 40 described above via a pipe 46. That is, the throttle body 18 is provided at a position upstream of the intake air supply device 10 and downstream of the supercharger 20.

  Furthermore, a plate-shaped mounting stay (mounting member) 48 is sandwiched between the throttle body 18 and the first flange portion 34 of the intake manifold 14. The mounting stay 48 is formed, for example, by press-molding a plate material, extends from the throttle valve 40 downward in the direction of gravity (arrow A2 direction), and is formed in a crank shape having a plurality of diffraction curves. Yes.

  The mounting stay 48 is fixed to the side surface of the cylinder head 64 of the internal combustion engine 12 with a bolt 50 with one end thereof being sandwiched and fixed between the throttle body 18 and the intake manifold 14.

  The other end of the mounting stay 48 is not limited to being fixed to the cylinder head 64. For example, the mounting stay 48 may be fixed to the head cover 22 or the head cover 22 and the cylinder head 64. You may make it fix to both.

  For example, the chamber part 26 is formed in a box shape having a rectangular cross section and a predetermined volume, and an opening 52 (see FIG. 2) is formed on a side wall that is one end in the width direction, and the intercooler 16 is formed through the opening 52. Is stored inside. That is, the chamber part 26 also functions as an intercooler storage part in which the intercooler 16 is stored. The opening 52 is closed by a cover portion 54 provided at the end of the intercooler 16 in a state where the intercooler 16 is housed in the chamber portion 26.

  In the chamber portion 26, an upstream space 56 is provided at a position upstream from the intercooler 16, and the introduction portion 24 is connected to a wall portion facing the upstream space 56. On the other hand, a downstream space 58 is provided at a position downstream of the intercooler 16, and a later-described derivation unit 28 is connected thereto. That is, air from the introduction part 24 is introduced into the upstream space 56 of the chamber part 26, and air that has passed through the intercooler 16 flows from the downstream space 58 to the outlet part 28.

  The lead-out part 28 has three branch pipes 60 (see FIG. 2) extending while curving toward the opposite side of the introduction part 24 with respect to the chamber part 26, and the branch pipe 60 is at the tip part. Each is connected to an intake port of a cylinder head 64 in the internal combustion engine 12 through a provided second flange portion 62.

  The intercooler 16 is made of, for example, a metal material such as aluminum, is formed in a rectangular parallelepiped box shape along the width direction (arrow B direction) of the chamber portion 26, and circulates in a flow path formed therein. The heat exchange between the medium to be passed and the passing air is performed. The air flowing into the chamber portion 26 through the introduction portion 24 passes through the interior of the intercooler 16 to exchange heat with the medium, and is supplied from the outlet portion 28 to the internal combustion engine 12 as cooled air.

  Further, as shown in FIG. 1, the intercooler 16 is disposed at a position opposite to the supercharger 20 with the internal combustion engine 12 interposed therebetween, and the position at the uppermost position in the gravitational direction is the throttle body. It arrange | positions so that it may become a gravity direction downward (arrow A2 direction) rather than 18 flow paths 38. FIG.

  For example, the supercharger 20 is provided on the side of the head cover 22 in the internal combustion engine 12 and at a position close to the throttle body 18, and is a blade (not shown) that rotates using exhaust gas discharged from the internal combustion engine 12. Is provided inside the casing 66. The supercharger 20 is connected to the piping 46 by a lead-out port 20a for leading the compressed air, so that the air sucked under the rotating action of the blades is compressed and the piping 46 and the throttle body 18 are compressed. And is supplied into the internal combustion engine 12 through the intake manifold 14.

  The intake air supply device 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect will be described.

  First, in a vehicle (not shown), the drive source 44 of the throttle body 18 rotates by a predetermined rotation angle according to the accelerator opening operated by the occupant, and accordingly, the throttle valve 40 opens by a predetermined angle around the shaft 42. As a result, the upstream pipe 46 and the downstream intake manifold 14 communicate with each other through the flow path 38 of the throttle body 18.

  At the same time, exhaust gas generated under the driving action of the internal combustion engine 12 is supplied to the supercharger 20, whereby air is sucked into the supercharger 20 and the compressed air is discharged into the outlet 20a. To the piping 46 connected to the downstream side.

  The compressed air flows from the pipe 46 through the flow path 38 of the throttle valve 40 to the introduction portion 24 of the intake manifold 14, and downstream along the first passage portion 30 of the introduction portion 24 formed in a straight line. And then reaches the upstream space 56 via the second passage portion 32 that gradually expands in the width direction (the arrow B direction in FIGS. 2 and 3) with respect to the first passage portion 30.

  At this time, since the air flows from the first passage portion 30 to the second passage portion 32 that is smoothly widened, there is no sudden pressure change. For example, generation of condensed water due to the sudden pressure change occurs. It is suppressed.

  And after air is introduced over the whole area in the width direction (arrow B direction) of the upstream side space 56, it flows into the inside of the intercooler 16 arrange | positioned to the full width dimension of this upstream side space 56 (chamber part 26). Thus, heat exchange is performed with the medium circulating inside, and the medium is cooled to a predetermined temperature.

  At this time, the air is supplied from the one end portion of the intercooler 16 to the other end portion through the second passage portion 32 of the introduction portion 24 in the upstream space 56 that is upstream of the intercooler 16. Therefore, it is possible to efficiently exchange heat by allowing the entire surface along the width direction of the intercooler 16 to pass evenly.

  Finally, the air cooled by the intercooler 16 is supplied from the downstream space 58 in the chamber part 26 to each port in the internal combustion engine 12 through the branch pipe 60 of the outlet part 28.

  As described above, in the present embodiment, in the intake air supply device 10, the throttle body 18 is disposed in the vicinity of the supercharger 20, and the throttle body 18 and the intake are straddled across the upper part of the internal combustion engine 12 along the direction of gravity. The intercooler 16 is disposed inside the intake manifold 14 so as to be connected to the manifold 14 and on the opposite side of the supercharger 20 across the internal combustion engine 12, and at the upstream side of the intercooler 16 in the intake manifold 14. The introduction portion 24 is joined to the first passage portion 30 continuously formed with a substantially constant passage cross-sectional area from the connection portion with the throttle body 18, and the length of the intercooler 16 joined to the downstream side of the first passage portion 30. The cross-sectional area of the passage expands in the direction (width direction), and the chamber has the largest cross-sectional area. Constitute a second passage portion 32 which is connected to the 26.

  Thereby, compared with the intake air supply device according to the prior art, the introduction part 24 to the intercooler 16 can be ensured longer, and the second passage part 32 on the downstream side in the introduction part 24 is replaced with the first passage part 30. In contrast, by gradually increasing the passage cross-sectional area, the air flow direction can be gently deflected toward the downstream side.

  As a result, a sudden pressure change in the intake manifold 14 is prevented, the generation of condensed water due to the pressure change is prevented, and the contact range when air passes through the intercooler 16 is widened so as to pass over the entire surface. Therefore, the cooling efficiency of the air by the intercooler 16 can be improved.

  Further, the intake air supply device 10 including the intake manifold 14 constitutes an air flow path that gently curves so as to surround the upper portion of the internal combustion engine 12, and therefore, from the supercharger 20 to the internal combustion engine 12. The air flow can be made smooth.

  Furthermore, by setting the passage length of the introduction portion 24 composed of the first and second passage portions 30 and 32 to be longer than the passage length of the outlet portion 28 on the downstream side with respect to the intercooler 16, the introduction portion 24 is set. Accordingly, the shape of the introduction portion 24 can be optimized to widen the contact range when air passes from the introduction portion 24 to the intercooler 16. Become. Therefore, the air cooling efficiency can be further improved, and accordingly, the intake efficiency of the internal combustion engine 12 can be increased.

  Furthermore, the lower end portion of the throttle body 18 along the direction of gravity of the drive source 44 is lower than the head cover 22 that is the uppermost part of the internal combustion engine 12 in the direction of gravity or the uppermost part of components mounted on the head cover 22. Since the throttle body 18 and the head cover 22 can be arranged so as to overlap with each other, the intake air supply device 10 can be downsized in the direction of gravity (height direction).

  Furthermore, the throttle body 18 is relatively heavy by being fixed to the cylinder head 64 of the internal combustion engine 12 via an attachment stay 48 that is sandwiched between the intake manifold 14 and extends downward in the gravitational direction. Since the throttle body 18 can be reliably fixed to the internal combustion engine 12, the vibration can be prevented.

  Further, since the mounting stay 48 has a structure in which a plurality of bent stays are formed so as to have a crank shape in cross section, the mounting stay 48 is easily deformed as compared with a case where the mounting stay 48 is formed in a flat shape without being bent. And the assembly error between the throttle body 18 and the intake manifold 14 and the internal combustion engine 12 can be suitably absorbed.

  Further, in the introduction part 24 of the intake manifold 14, a current plate is provided so that the air flow is preferably spread in the longitudinal direction (width direction) of the intercooler 16 from the first passage part 30 to the second passage part 32. Also good. For example, the rectifying plate may be formed in a plate shape corresponding to the outer shape of the introduction portion 24 and provided at a predetermined interval from the inner wall surface of the introduction portion 24. As a result, the air supplied from the first passage portion 30 to the intercooler 16 through the second passage portion 32 in the introduction portion 24 can be more suitably applied over the entire surface of the intercooler 16, so that the air The cooling efficiency can be further improved.

  In addition, the intake air supply device according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Intake supply device 12 ... Internal combustion engine 14 ... Intake manifold 16 ... Intercooler 18 ... Throttle body 20 ... Supercharger 22 ... Head cover 24 ... Introduction part 26 ... Chamber part 28 ... Derivation part 30 ... 1st channel | path part 32 ... 2nd Passage portion 48 ... mounting stay 56 ... upstream space 58 ... downstream space

Claims (4)

A supercharger that supplies air compressed by exhaust gas discharged from an internal combustion engine, a throttle body that controls the amount of intake air to the internal combustion engine, and an intercooler that is connected downstream of the throttle body and incorporates an intercooler An intake manifold having an accommodating portion, for introducing the air into the internal combustion engine,
The throttle body is disposed in the vicinity of the supercharger, and the intake manifold and the throttle body are connected so as to straddle an upper portion along the direction of gravity in the internal combustion engine,
The intercooler is disposed so as to be opposite to the supercharger across the internal combustion engine, and the uppermost position is disposed so as to be lower in the gravitational direction than the passage in the throttle body,
An upstream passage of the intercooler in the intake manifold, a first passage portion formed continuously from the connecting portion with the throttle body with a substantially constant passage cross-sectional area;
A second passage portion that is joined to the downstream side of the first passage portion, the passage cross-sectional area is enlarged in the longitudinal direction of the intercooler, and is connected to the intercooler housing portion at the maximum passage cross-sectional area;
An intake air supply apparatus comprising: The intake air supply device according to claim 1, wherein
The intake air supply apparatus according to claim 1, wherein an upstream side passage composed of the first and second passage portions is formed longer than a downstream side passage which is a downstream side of the intercooler. The intake air supply device according to claim 1 or 2,
The throttle body is provided therein with a throttle valve that adjusts the amount of intake air to the internal combustion engine so as to be openable and closable, and a lower end portion along the gravity direction of a drive source that drives the throttle valve is provided in the internal combustion engine. An intake air supply device that is arranged to be lower than a position that is the uppermost in the direction of gravity in the components mounted on the air intake. The intake air supply device according to any one of claims 1 to 3,
The intake air supply device according to claim 1, wherein the throttle body is held by the internal combustion engine through an attachment member sandwiched between the intake manifold and the intake manifold.

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