JP2018119456A - Suction system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction system which can inhibit condensed water from concentrically flowing into one of multiple branch suction pipes.SOLUTION: A suction system 100 is a suction system of a multicylinder engine 10 having a supercharger 30. The suction system 100 includes: a collective suction pipe 61 in which an intercooler 7 for cooling suctioned air circulating in the collective suction pipe 61 is disposed; and multiple branch suction pipes 62 which are branched at the downstream of the collective suction pipe 61 and are provided corresponding to multiple cylinders 10b and in which suctioned air circulates. The collective suction pipe 61 includes projection parts 64 which are provided protruding from a lower surface 61d of an inner surface 61c of the collective suction pipe 61 and extend from a downstream side outlet 7c of the intercooler 7 to the multiple branch suction pipes 62 side.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake device.

  Currently, in an intake system for a multi-cylinder engine having a supercharger, the compressed intake air is cooled by an intercooler, thereby increasing the density of the compressed intake air and improving the torque and fuel consumption of the multi-cylinder engine. It is generally done. At this time, by arranging the intercooler in the intake pipe (see, for example, Patent Document 1), the intake volume corresponding to the pipe connecting the intake pipe and the intercooler is compared with the case where the intercooler is provided outside the intake pipe. Therefore, it is possible to improve the responsiveness of supercharging by the supercharger.

  The above-mentioned Patent Document 1 is an intake device arranged between a compressor (supercharger) and an internal combustion engine (engine), and a supercharger heat exchanger (intercooler) is arranged in a pipe. An intake device including an inlet manifold (intake pipe) is disclosed. The inlet manifold of the intake device includes an upstream pipe (collecting intake pipe) in which a heat exchanger for a supercharger is disposed, and a downstream pipe (formed at the same height as the lower end of the upstream pipe) that branches into three ( Branch intake pipe).

  Here, when the high-temperature and high-pressure intake air intake from the compressor is cooled by the intercooler, the water in the intake air is liquefied. For this reason, condensed water will generate | occur | produce in the downstream of an intercooler and an intercooler. In the air intake device disclosed in Patent Document 1, it is considered that the condensed water generated at the lower end (bottom surface) of the inner surface of the upstream pipe is located. And it is thought that the condensed water which generate | occur | produced distribute | circulates the downstream pipe | tube branched into three, and is supplied in the cylinder (combustion chamber) of an internal combustion engine.

Japanese Utility Model Publication No. 63-44704

  However, in the intake device disclosed in Patent Document 1, any of the three downstream pipes (branch intake pipes) is caused by the fact that the condensed water moves due to the steering operation and acceleration / deceleration operation of the vehicle on which the internal combustion engine is mounted. There is a problem that condensed water flows into the downstream pipe. Here, if a large amount of condensed water flows into the combustion chamber at once through the downstream pipe, it may cause misfire in the combustion chamber or decrease the output of the multi-cylinder engine.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to condense the condensed water into any one of the plurality of branch intake pipes. It is an object of the present invention to provide an air intake device capable of suppressing the occurrence of this.

  In order to achieve the above object, an intake apparatus according to one aspect of the present invention is an intake apparatus for a multi-cylinder engine having a supercharger, and an intercooler that cools intake air flowing through the pipe is disposed in the pipe. And a plurality of branch intake pipes that are provided in correspondence with the plurality of cylinders and through which the intake air flows, and the collective intake pipe is a collective intake pipe. A protrusion is provided that protrudes from the lower surface of the inner surface of the pipe and extends from the downstream outlet of the intercooler toward the plurality of branch intake pipes. “Upstream side” and “downstream side” mean the upstream side and the downstream side in the direction of intake air flow (intake direction), respectively.

  In the intake device according to one aspect of the present invention, as described above, the collective intake pipe is provided so as to protrude from the lower surface of the inner surface of the collective intake pipe and is directed from the downstream outlet of the intercooler toward the plurality of branch intake pipes. Including an extending protrusion. As a result, when the high-temperature and high-pressure intake air intake from the supercharger is cooled by the intercooler, the water in the intake air is liquefied as condensed water on the lower surface of the inner surface of the collective intake pipe. The protrusions extending from the outlet toward the plurality of branch intake pipes can restrict the movement of the condensed water from the one region separated by the protrusions to the other region. As a result, even if a steering operation and acceleration / deceleration operation are performed in a vehicle equipped with a multi-cylinder engine, the condensed water is concentrated in a region extending toward one of the plurality of branch intake pipes by the protrusion. Can be suppressed. As a result, it is possible to prevent the condensed water from concentrating and flowing into any one of the plurality of branch intake pipes. Therefore, it is possible to suppress the occurrence of misfire in the combustion chamber in the cylinder or the decrease in output of the multi-cylinder engine.

  In the intake device according to the one aspect described above, preferably, the protrusion at the downstream outlet of the intercooler partitions the downstream outlet of the intercooler into a plurality of outlet portions so that the flow rate of the intake air is equal in a plan view. It is located on the dividing line.

  If comprised in this way, since the flow volume of intake air can be made equal in the some exit part of an intercooler, the generation amount of the condensed water in each of a some exit part can be closely approached. Thereby, the flow volume of the condensed water in the area | region of one side separated by the projection part and the flow volume of the condensed water in the area | region of the other side separated by the projection part can be closely approached. Furthermore, the movement of the condensed water between the regions separated by the protrusions can be restricted. Accordingly, it is possible to more reliably perform the condensate flow into the plurality of branch intake pipes.

  In this case, preferably, the plurality of protrusions are formed in the width direction orthogonal to the intake direction at the downstream outlet of the intercooler, and the plurality of protrusions and the inner surface in the width direction of the collective intake pipe are connected to the intercooler. The downstream outlet is formed so as to have a non-uniform interval in the width direction.

  With this configuration, when the flow rate of the intake air passing through the collective intake pipe (intercooler) is not constant in the width direction, the plurality of protrusions and the collective intake pipe that are spaced apart in the width direction are spaced apart. With the inner surface in the width direction, the downstream outlet of the intercooler can be appropriately divided into a plurality of outlet portions so that the flow rate of the intake air becomes uniform.

  In the configuration in which the plurality of protrusions are formed so as to have a non-uniform interval, preferably, the plurality of protrusions and the inner surface in the width direction of the collective intake pipe have a width direction interval at the center portion at the end portion. It is formed so as to have a non-uniform interval at the downstream outlet of the intercooler so as to be smaller than the interval in the width direction.

  If comprised in this way, when the flow volume of the intake air which passes the center part in a collection intake pipe (intercooler) is large compared with the flow volume of the intake air which passes an edge part, the flow volume of intake air becomes equal. Thus, the downstream outlet of the intercooler can be appropriately divided into a plurality of outlet portions.

  In the configuration in which the plurality of protrusions are formed so as to be spaced at a non-uniform interval, preferably, the plurality of protrusions are separated from each other at a non-uniform interval at the downstream outlet of the intercooler. It is formed to be in a state of being evenly spaced toward the tube side.

  According to this configuration, even when the protrusions affect the flow of intake air, the protrusions are formed so as to be evenly spaced toward the plurality of branch intake pipes. Thus, the intake air can be appropriately distributed to each branch intake pipe.

  The intake device according to the above aspect preferably further includes a groove provided on the lower surface of the inner surface of the collective intake pipe and extending toward the plurality of branched intake pipes.

  If comprised in this way, when condensed water is located in a groove part, the movement of the condensed water from the area | region of the one side separated by the projection part to the area | region of the other side can be controlled further.

  In the intake device according to the above aspect, the protrusion preferably extends from a downstream outlet of the intercooler to a plurality of connection openings connected to the plurality of branch intake pipes.

  If comprised in this way, the movement of the condensed water from the area | region of one side separated by the protrusion part to the area | region of the other side in the whole region between the downstream exit of an intercooler and several connection opening parts is a protrusion part. It can be regulated by. Further, the condensate can be reliably guided from the downstream outlet of the intercooler to the connection opening by the protrusion extending between the plurality of connection openings.

  In this case, preferably, a plurality of connection openings are formed at the lowermost end of the lower surface of the collective intake pipe, and the lower surface formed with the protrusion on the inner surface of the collective intake pipe faces the plurality of connection openings. It is formed to have a downward slope.

  If comprised in this way, since condensed water can be reliably flowed down toward a connection opening part, it can suppress that condensed water is stored by the lower surface of a collection intake pipe. Thereby, it can suppress that the stored large amount of condensed water gets over a projection part easily.

  In the present application, the following other configurations are also conceivable.

(Additional item 1)
That is, in the intake device according to the one aspect, the collective intake pipe is disposed above the multiple cylinder engine.

(Appendix 2)
An intake device according to another aspect is an intake device of a multi-cylinder engine having a supercharger, and is divided into a collective intake pipe through which intake air flows and a downstream of the collective intake pipe and into a plurality of cylinders. A plurality of branch intake pipes that are provided correspondingly and through which the intake air flows, and an intercooler that is disposed in the collective intake pipe and cools the intake air that flows through the collective intake pipe. The collective intake pipe includes a protrusion that protrudes from the lower surface of the inner surface of the collective intake pipe and extends from the downstream outlet of the intercooler toward the plurality of branch intake pipes.

  According to the present invention, as described above, it is possible to prevent the condensed water from concentrating and flowing into any one of the plurality of branch intake pipes.

It is the schematic diagram which showed the engine periphery using the intake device by 1st Embodiment of this invention. 1 is a side view of an intake device according to a first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line 400-400 in FIG. 2. It is a figure for demonstrating the relationship between the intake air flow volume and protrusion part in the downstream exit of the intake device by 1st Embodiment of this invention. It is sectional drawing of the intake device by 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along line 410-410 in FIG. 5. It is a figure for demonstrating the relationship between the intake air flow volume and protrusion part in the downstream exit of the intake device by 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along line 420-420 in FIG. FIG. 6 is a cross-sectional view taken along line 430-430 in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
With reference to FIGS. 1-4, the structure of the intake device 100 by 1st Embodiment of this invention is demonstrated.

(Intake device structure, etc.)
The intake device 100 according to the first embodiment of the present invention is an intake device used for a multi-cylinder engine 10 (a four-cylinder engine in FIG. 1, hereinafter referred to as the engine 10) mounted on a vehicle (not shown). As shown in FIG. 1, the intake device 100 is provided on the upstream side of the engine 10, and is configured to guide intake air (intake air) to each cylinder of the engine 10. In the first embodiment, the vertical direction when the engine 10 is mounted on a vehicle (not shown) is defined as the vertical direction (Z direction) of the intake device 100.

  In the engine 10, the cylinders are formed side by side in the X direction. Each cylinder is connected to a plurality of (four) branch intake pipes 62, which will be described later, of the intake device 100 via corresponding intake ports 10a. As a result, the intake air flowing through the intake device 100 is supplied to the combustion chamber of each cylinder 10 b of the engine 10. The engine 10 is driven and controlled by an ECU (Engine Control Unit) (not shown).

  An exhaust device 20 through which exhaust gas discharged from an exhaust port 10 c provided in each cylinder of the engine 10 flows is provided on the downstream side of the engine 10. The exhaust device 20 includes an exhaust manifold 21, a pre-supercharger exhaust pipe 22, and a supercharger post-exhaust pipe 23. The exhaust manifold 21 has a plurality of branch exhaust pipes 21a connected to each of the plurality of exhaust ports 10c, and a collective exhaust pipe 21b connected to the plurality of branch exhaust pipes 21a on the downstream side of the branch exhaust pipe 21a. ing. As a result, the exhaust gas discharged from the combustion chamber of the cylinder 10b of the engine 10 is discharged outside the vehicle by the exhaust device 20.

  A supercharger 30 that compresses intake air is provided between the intake device 100 and the exhaust device 20. The supercharger 30 is provided between an intake compressor 31 through which intake air circulates, an exhaust pipe 23 after the supercharger, and an exhaust pipe 23 after the supercharger, and an exhaust circulation through which exhaust gas circulates. Part 32.

  An intake turbine 31 a is provided inside the intake compression unit 31, and an exhaust turbine 32 a is provided inside the exhaust circulation unit 32. The intake turbine 31 a and the exhaust turbine 32 a are connected via a rotating shaft portion 33. As a result, the rotation of the exhaust turbine 32 a that is rotated by the exhaust gas that circulates inside the exhaust circulation portion 32 rotates the intake turbine 31 a via the rotary shaft portion 33. The supercharger 30 is configured such that intake air flowing through the intake turbine 31a is compressed using the rotation of the intake turbine 31a. Moreover, the temperature of the intake air compressed in the supercharger 30 becomes high.

  Further, an exhaust gas recirculation (EGR) gas circulation unit 40 is provided so as to connect the intake device 100 and the exhaust device 20. The EGR gas circulation unit 40 is provided to introduce and recirculate exhaust gas (EGR gas) that circulates inside the exhaust device 20 into the intake device 100.

  The EGR gas circulation part 40 includes a piping part 41 through which EGR gas circulates, and an EGR valve 42 that is provided in the piping part 41 and adjusts the amount of EGR gas that circulates in the pipe part 41. The piping part 41 connects the supercharger exhaust pipe 23 of the exhaust device 20 and an air hose 3 described later of the intake device 100. That is, the EGR gas circulation unit 40 is configured to recirculate the positive pressure exhaust gas flowing in the exhaust pipe 23 after the supercharger to the negative pressure intake air before compression flowing in the air hose 3. (Low Pressure) EGR type EGR gas distribution section. As a result, the intake air is prevented from flowing back through the pipe portion 41 and flowing out to the exhaust pipe 23 after the supercharger. The opening degree of the EGR valve 42 is controlled by the ECU.

(Detailed structure of intake device)
In the intake device 100, the air duct 1, the air cleaner 2, the air hose 3, the intake air compression portion 31 of the supercharger 30, the air hose 4, the throttle 5, and the intake manifold 6 (hereinafter referred to as intake manifold, An example) communicates in this order.

  The air duct 1 is provided for taking outside air as intake air. The air cleaner 2 has an air filter 2a, and has a function of removing the foreign matter contained in the intake air sucked from the air duct 1 to clean the intake air.

  In the intake compression unit 31, intake air including EGR gas flowing from the EGR gas circulation unit 40 is compressed by the intake turbine 31 a and sent out to the air hose 4.

  A throttle valve 5 a is arranged inside the throttle 5. The throttle valve 5a has a function of adjusting (squeezing) the flow rate of the intake air when the rotational state is controlled by the ECU.

  As shown in FIGS. 1 and 2, the intake manifold 6 includes a collective intake pipe 61 connected to the throttle 5 and a plurality (four) of branched intake pipes connected to the collective intake pipe 61 on the downstream side of the collective intake pipe 61. Tube 62. The intake manifold 6 is formed at an end portion on the side of the collective intake pipe 61 and is formed at a flange portion 6a for connecting to the throttle 5, and is formed at an end portion on the side of the branch intake pipe 62 and connected to the engine 10. And a portion 6b.

  The intake manifold 6 may be formed by joining a plurality of parts, or may be formed integrally. The intake manifold 6 is preferably made of heat-resistant resin (for example, made of polyamide resin mixed with glass fibers) from the viewpoint of weight reduction, but may be made of metal (for example, made of aluminum alloy).

  2 and 3, the collective intake pipe 61 includes an upstream collective pipe portion 61a into which intake air from the throttle 5 is introduced, and a downstream collective pipe connected to the downstream side of the upstream collective pipe portion 61a. And a tube portion 61b. In the upstream side collecting pipe part 61a, the pipe diameter of the opening on the throttle 5 side where the intake air is introduced (the diameter of the pipe in the direction orthogonal to the intake direction) is smaller than the pipe diameter of the downstream side collecting pipe part 61b. It is formed as follows. The upstream collecting pipe portion 61a is formed such that the pipe diameter gradually increases from the upstream side (throttle 5 side) toward the downstream side (downstream collecting pipe portion 61b side). In the collective intake pipe 61, intake air from the throttle 5 is introduced into the central portion in the width direction (X direction) orthogonal to the intake direction of the collective intake pipe 61. The downstream collecting pipe portion 61b is formed to have substantially the same pipe diameter along the intake direction.

  As shown in FIG. 3, the four branched intake pipes 62 are formed side by side in the width direction and in the X direction, which is the direction in which the cylinders are arranged. Further, the four branch intake pipes 62 are formed at a substantially uniform interval W1 in the X direction. The four branch intake pipes 62 communicate with the downstream collecting pipe part 61b through corresponding four connection openings 63 (63a to 63d). The four connection openings 63 are all formed on the lower surface 61 d of the inner surface 61 c of the collective intake pipe 61. The four connection openings 63 are formed at a uniform interval W1 in the X direction, like the four branch intake pipes 62.

  Further, as shown in FIG. 2, the intake manifold 6 has a downward slope over the entire intake manifold 6 from the upstream side (Z1 direction) to the downward direction (Z2 direction) from the upstream side to the downstream side in the intake direction. It is formed as follows. Further, the collective intake pipe 61 of the intake manifold 6 is disposed immediately above the engine 10. The connection opening 63 is formed at the lowermost end of the lower surface 61 d of the collective intake pipe 61. As a result, the lower surface 61d of the collective intake pipe 61 is formed to have a downward slope from the upstream side in the intake direction (upstream collective pipe part 61a side) toward the downstream side in the intake direction (connecting opening 63 side). ing.

  The intake device 100 is configured such that an intercooler 7 for cooling intake air can be accommodated in the intake manifold 6. The intercooler 7 is water-cooled. That is, as shown in FIG. 1, the intercooler 7 is connected to a radiator 72 that cools water (cooling water) warmed by the intercooler 7 via a water pipe 71. Further, the water pipe 71 is provided with a pump 73 for circulating cooling water between the intercooler 7 and the radiator 72.

  As shown in FIG. 3, the intercooler 7 is fixed so as to be positioned in the pipe of the downstream collecting pipe portion 61 b of the collecting intake pipe 61. The intercooler 7 is arranged in a region from the vicinity of the connection portion of the downstream side collecting pipe portion 61b to the upstream side collecting pipe portion 61a to the vicinity of the central portion in the intake direction of the downstream side collecting pipe portion 61b. Further, the intercooler 7 is fixed in the pipe of the intake manifold 6 so that there is no circulation path of intake air other than the inside of the intercooler 7. The intercooler 7 is formed in a rectangular shape when viewed from the intake direction.

  The intercooler 7 has a plurality of metal fins 7a extending in the intake direction, and a water passage portion 7b formed in a U shape so as to cross the plurality of fins 7a and through which cooling water flows. The plurality of fins 7a are formed at a predetermined interval in the width direction.

  In the intercooler 7, heat exchange is performed between the intake air flowing between the plurality of fins 7a and the fins 7a. The intake air is cooled by this heat exchange. At this time, the condensed water generated by liquefying a part of the moisture contained in the intake air is discharged from the downstream outlet 7c side of the intercooler 7 onto the lower surface 61d of the downstream collecting pipe portion 61b. Further, the fin 7a is cooled by the cooling water flowing through the water passage portion 7b. Here, since the water passage portion 7b is formed in a U shape so as to cross the plurality of fins 7a, the plurality of fins 7a formed at predetermined intervals in the width direction are cooled substantially uniformly. . Further, both end portions of the water passage portion 7 b are connected to the water pipe 71.

  Here, in the first embodiment, the lower surface 61d of the inner surface 61c of the collective intake pipe 61 has a plurality of (three) protrusions 64 (64a to 64c) protruding in a rib shape upward (Z1 direction) from the lower surface 61d. Is provided. The plurality of protrusions 64 extend from the downstream outlet 7c of the intercooler 7 toward the branch intake pipe 62 side to between the connection openings 63 along the intake direction. Specifically, the protrusion 64a on the X1 direction side extending from the downstream outlet 7c of the intercooler 7 includes a connection opening 63a located closest to the X1 direction and a connection opening adjacent to the connection opening 63a on the X2 direction side. It extends to between the parts 63b. The central protrusion 64b in the X direction extending from the downstream outlet 7c of the intercooler 7 extends between the connection opening 63b and the connection opening 63c adjacent to the connection opening 63b on the X2 direction side. The projection 64c on the X2 direction side extending from the downstream outlet 7c of the intercooler 7 extends to between the connection opening 63c and the connection opening 63d located on the most X2 direction side. In addition, although the some protrusion part 64 is not contacting the downstream exit 7c of the intercooler 7, it is provided in proximity to the downstream exit 7c of the intercooler 7. The plurality of protrusions 64 may be provided so as to contact the downstream outlet 7 c of the intercooler 7.

  The three protrusions 64 are formed so as to extend linearly from the downstream outlet 7c of the intercooler 7 to the connection opening 63 in plan view.

  Further, due to the three protrusions 64, the downstream collecting pipe portion 61 b of the collecting intake pipe 61 is arranged in four regions R (R 1 to R 4) in the X direction downstream from the downstream outlet 7 c of the intercooler 7. It is divided. The region R1 is a region between the side surface 61e on the X1 direction side of the inner surface 61c of the downstream collecting pipe portion 61b and the protruding portion 64a on the X1 direction side. The region R2 is a region between the protrusion 64a and the central protrusion 64b in the X direction. The region R3 is a region between the central projecting portion 64b in the X direction and the projecting portion 64c on the X2 direction side. The region R4 is a region between the protrusion 64c and the side surface 61f on the X2 direction side of the inner surface 61c of the downstream collecting pipe portion 61b. That is, the region R1 and the region R2 are separated in the width direction by the protrusion 64a. The region R2 and the region R3 are separated in the width direction by the protrusion 64b. The region R3 and the region R4 are separated in the width direction by the protrusion 64c.

  In the first embodiment, the plurality of protrusions 64 are formed at substantially uniform intervals W2 in the width direction (X direction) over the whole along the intake direction. Further, the protrusion 64a and the side surface 61e are spaced apart from each other by a gap W2 in the width direction (X direction). Similarly, the protrusion 64c and the side surface 61f are separated from each other by a gap W2 in the width direction (X direction). As a result, the plurality of protrusions 64 have a plurality (four) of the downstream outlets 7c so that the lengths in the width direction of the downstream outlets 7c of the intercooler 7 are equal in plan view. It is divided into E1 to E4).

  That is, the plurality of protrusions 64 are dividing lines D (D1) that divide the rectangular downstream outlet 7c of the intercooler 7 into a plurality of outlet portions E so that the flow area of the intake air is uniform in plan view. To D3). As a result, as shown in FIG. 4, the downstream collecting pipe portion 61b is formed to have a sufficient length in the intake direction, and the intake air introduced into the central portion is in the downstream collecting pipe portion 61b. When the intake air circulates substantially uniformly throughout the intercooler 7 by spreading substantially uniformly throughout, the plurality of protrusions 64 are positioned on the dividing line D (D1 to D3). The respective intake flow rates F1 to F4 at the outlet portions E1 to E4 (intake flow rate F = flow passage area of the outlet portion E × flow rate per unit area of intake air) can be made substantially uniform. As a result, the plurality of protrusions 64 are positioned on the dividing line D (D1 to D3) that divides the downstream outlet 7c into a plurality of outlet portions E so that the flow rate of the intake air is uniform in plan view. Yes.

  As a result, the amount of condensed water generated at the plurality of outlet portions E1 to E4 can be made closer to each other, so that the flow rate of condensed water in the regions R1 to R4 can be made closer to the same.

  Further, the protrusion height H1 (see FIG. 2) of the protrusion 64 from the lower surface 61d is about 5 mm or more. Here, since the size of the water droplets of the condensed water that has been liquefied into water droplets is about 5 mm at the maximum, even if steering operation and acceleration / deceleration operations are performed in the vehicle on which the engine 10 is mounted, The possibility that the condensed water located on the lower surface 61d gets over the protrusion 64 protruding from the lower surface 61d by about 5 mm or more is sufficiently low. The protrusion height H1 of the protrusion 64 from the lower surface 61d is preferably not more than half (50%) of the tube diameter of the downstream collecting pipe portion 61b, and more preferably not more than 20%.

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the collective intake pipe 61 is provided so as to protrude from the lower surface 61d of the inner surface 61c of the collective intake pipe 61, and from the downstream outlet 7c of the intercooler 7 to the plurality of branch intake pipes 62 side. It includes a protrusion 64 extending toward it. Thereby, when the high-temperature and high-pressure intake air intake from the supercharger 30 is cooled by the intercooler 7, when the water in the intake air is liquefied as condensed water on the lower surface 61d of the inner surface 61c of the collective intake pipe 61, The projection 64 extending from the downstream outlet 7c of the intercooler 7 toward the plurality of branch intake pipes 62 condenses from one region R in the width direction separated by the projection 64 to the other region R in the width direction. It is possible to regulate the movement of water. Thereby, even if a steering operation and an acceleration / deceleration operation are performed in the vehicle on which the engine 10 is mounted, the condensed water is concentrated in the region R extending toward one of the plurality of branch intake pipes 62 by the protrusion 64. Therefore, the condensed water can be prevented from concentrating and flowing into any one of the plurality of branch intake pipes 62. Therefore, it is possible to suppress the occurrence of misfire in the combustion chamber of the cylinder 10b or the output reduction of the engine 10.

  Further, in the first embodiment, as described above, the protrusion 64 at the downstream outlet 7c of the intercooler 7 is arranged so that the downstream outlet 7c has a plurality of outlet portions so that the flow rate of the intake air becomes equal in a plan view. It arrange | positions on the dividing line D (D1-D3) divided into E (E1-E4). Thereby, by equalizing the flow rate of the intake air at the plurality of outlet portions E of the intercooler 7, the amount of condensed water generated at the plurality of outlet portions E can be made closer to each other. As a result, the flow rate of the condensed water in the region R on one side separated by the protrusion 64 and the flow rate of the condensed water in the region R on the other side separated by the protrusion 64 can be made close to each other. Furthermore, the movement of the condensed water between the regions R separated by the protrusions 64 can be restricted. As a result, the condensed water can be evenly introduced into the plurality of branch intake pipes 62 even more reliably.

  Further, in the first embodiment, as described above, the protrusion 64 extends from the downstream outlet 7c of the intercooler 7 to between the plurality of connection openings 63 connected to the plurality of branch intake pipes 62, respectively. Thereby, in the entire region from the downstream outlet 7c of the intercooler 7 to the plurality of connection openings 63, the condensed water moves from the region R on one side separated by the protrusion 64 to the region R on the other side. It can be regulated by the protrusion 64. Further, the condensate can be reliably guided from the downstream outlet 7 c of the intercooler 7 to the connection opening 63 by the protrusion 64 extending between the plurality of connection openings 63.

  In the first embodiment, as described above, the plurality of connection openings 63 are formed at the lowermost end of the lower surface 61 d of the collective intake pipe 61. In addition, the lower surface 61 d on which the projection 64 of the inner surface 61 c of the collective intake pipe 61 is formed is formed so as to descend toward the plurality of connection openings 63. As a result, the condensed water can surely flow down toward the connection opening 63, so that the condensed water can be suppressed from being stored in the lower surface 61 d of the collective intake pipe 61. As a result, it is possible to prevent the stored large amount of condensed water from easily getting over the protrusion 64.

  In the first embodiment, the collective intake pipe 61 is disposed above the engine 10 as described above. Thereby, the condensed water generated in the collective intake pipe 61 can be surely and quickly flowed down to the engine 10 below. Further, the lower surface 61 d on which the protrusion 64 of the inner surface 61 c of the collective intake pipe 61 is formed can be easily formed so as to have a downward slope toward the plurality of connection openings 63.

  In the first embodiment, as described above, the condensed water containing components in the exhaust gas (EGR gas) is directly discharged to the outside of the vehicle by guiding the condensed water to the combustion chamber of the engine 10. Can be prevented.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. In the second embodiment, unlike the configuration of the first embodiment, a plurality of (three) protrusions 164 and an inner surface 61c (side surface) in the width direction of the collective intake pipe 161 at the downstream outlet 7c of the intercooler 7. An example in which a plurality of protrusions 164 are formed so that 61e and 61f) are spaced at a non-uniform distance will be described. In the drawing, the same reference numerals as those in the first embodiment are assigned to the same components as those in the first embodiment, and the description thereof is omitted.

(Detailed structure of intake device)
In the intake device 200 according to the second embodiment of the present invention, as shown in FIG. 5, among the projections 164 formed on the collective intake pipe 61 of the intake manifold 106, the projection 164 a on the X1 direction side and the projection on the X2 direction side The part 164c is formed in a wave shape in a plan view. Specifically, in the protrusion portion 164a on the X1 direction side, the end portion 264a on the downstream outlet 7c side of the intercooler 7 is closer to the center portion side (X2 direction side) in the X direction than the end portion 364a on the connection opening 63 side. ). And in the projection part 164a, the edge part 264a and the edge part 364a are connected gently. Similarly, in the protrusion portion 164c on the X2 direction side, the end portion 264c on the downstream outlet 7c side of the intercooler 7 is closer to the center portion side (X1 direction side) in the X direction than the end portion 364c on the connection opening 63 side. positioned. And in the projection part 164c, the edge part 264c and the edge part 364c are connected gently. On the other hand, the central protrusion 64b in the X direction is formed so as to extend linearly from the downstream outlet 7c of the intercooler 7 to the connection opening 63 in plan view, as in the first embodiment.

  As a result, the plurality of protrusions 164 and the side surfaces 61e and 61e of the inner surface 61c of the downstream collecting pipe portion 61b are spaced apart from each other in the width direction (X direction) at the downstream outlet 7c of the intercooler 7. A plurality of protrusions 164 are formed. Specifically, as shown in FIG. 6, in the downstream outlet 7c, the interval W11a in the width direction between the side surface 61e on the X1 direction side of the downstream collecting pipe portion 161b and the protrusion portion 164a on the X1 direction side is the protrusion portion. It is larger than the interval W12a in the width direction between 164a and the central protrusion 64b in the X direction. Further, the widthwise interval W14a between the side surface 61f on the X2 direction side of the downstream collecting pipe portion 161b and the protrusion portion 164c on the X2 direction side is larger than the interval W13a in the width direction between the protrusion portion 164c and the protrusion portion 64b. The interval W11a and the interval W14a are substantially equal, and the interval W12a and the interval W13a are substantially equal.

  As a result, the plurality of protrusions 164 are formed such that the intervals W12a and W13a at the center in the width direction are smaller than the intervals W11a and W14a at the ends in the width direction at the downstream outlet 7c. Accordingly, in plan view, the downstream outlet 7c of the intercooler 7 is partitioned by the plurality of protrusions 164, whereby the flow passage areas of the outlet portions E12 and E13 in the central portion in the width direction are at the end portions in the width direction. It becomes smaller than the flow passage area of the outlet portions E11 and E14.

  Accordingly, as shown in FIG. 7, in the intercooler 7, the downstream collecting pipe portion 61b does not have a sufficient length in the intake direction, and the flow resistance in the side surfaces 61e and 61f is large. When the flow rate per unit area of the intake air at the central portion is larger than the flow rate per unit area of the intake air at the end portion, the intake air flows F11 to F14 (intake flow rates) at the outlet portions E11 to E14 are configured as described above. (F = flow area of outlet portion E × flow rate per unit area of intake air) can be made substantially uniform. As a result, the plurality of protrusions 164 in the downstream outlet 7c are divided lines D (D11 to D13) that divide the downstream outlet 7c into a plurality of outlet portions E so that the flow rate of the intake air becomes equal in plan view. Located on the top.

  As a result, the amount of condensed water generated at the plurality of outlet portions E11 to E14 can be made close to each other, so that the flow rate of condensed water in the regions R11 to R14 can be made close to even.

  Further, as shown in FIGS. 5 and 8, the plurality of protrusions 164 are positioned between the connection openings 63 (between the plurality of branch intake pipes 62) on the connection opening 63 side. Further, on the connection opening 63 side, the plurality of protrusions 164 and the side surfaces 61e and 61e of the inner surface 61c of the downstream collecting pipe portion 61b are separated by a plurality of uniform intervals W2 in the width direction (X direction). The protrusion 164 is formed. Specifically, as shown in FIG. 7, the plurality of protrusions 164 are formed on the connection opening 63 side with a substantially uniform interval W2 in the width direction. Further, the protrusion 164a and the side surface 61e are spaced apart in the width direction W2 on the connection opening 63 side. Similarly, the protrusion 164c and the side surface 61f are spaced apart in the width direction W2 on the connection opening 63 side. As shown in FIG. 6, the interval W2 is smaller than the interval W11a and the interval W14a, and larger than the interval W12a and the interval W13a.

  Further, as shown in FIG. 5, the plurality of protrusions 164 are spaced uniformly from the non-uniform spacing at the downstream outlet 7 c of the intercooler 7 toward the plurality of branch intake pipes 62. It is formed continuously so as to be in a state. As shown in FIG. 9, the width W11b between the side surface 61e and the protrusion 164a in the center of the protrusion 164 in the intake direction is greater than the distance W12b in the width direction between the protrusion 164a and the protrusion 64b. Is also big. The interval W11b is smaller than the interval W11a (see FIG. 6) and larger than the interval W2 (see FIG. 8). The interval W12b is larger than the interval W12a (see FIG. 6) and smaller than the interval W2. Similarly, in the central portion of the protrusion 164 in the intake direction, the widthwise interval W14b between the side surface 61f and the protrusion 164c is larger than the widthwise interval W13b between the protrusion 164c and the protrusion 64b. The interval W14b is smaller than the interval W14a (see FIG. 6) and larger than the interval W2. The interval W13b is larger than the interval W13a (see FIG. 6) and smaller than the interval W2.

  Further, as shown in FIGS. 8 and 9, in the four regions R (R11 to R14) divided in the X direction by the three protrusions 164, groove portions 161g each having a U-shaped cross section are formed. ing. The groove 161g is formed to be recessed downward. Further, the groove 161g is formed so as to connect the protrusions 164 to each other or the protrusion 164 and the side surface 61e or the side surface 61f. The groove 161g is formed so that the groove depth H2 gradually increases from the upstream side toward the downstream side in the intake direction. That is, almost no groove 161g is formed on the upstream side in the vicinity of the downstream outlet 7c of the intercooler 7 in FIG. On the other hand, the groove 161g is formed in the vicinity of the connection opening 63 in FIG. 8 so as to have a sufficiently large groove depth H2.

  In addition, since the cross section of the groove 161g is U-shaped so as to be depressed downward, it is possible to allow condensed water to flow toward the connection opening 63 in the vicinity of the connection opening 63. Thereby, it is possible to prevent the condensed water from being stored in the end portion (corner portion) near the connection opening 63 on the lower surface 161d of the collective intake pipe 161. In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, the collective intake pipe 161 is provided so as to protrude from the lower surface 161 d of the inner surface 61 c of the collective intake pipe 161 and extends from the downstream outlet 7 c of the intercooler 7 toward the plurality of branch intake pipes 62. 164. As a result, similar to the first embodiment, it is possible to prevent the condensed water from concentrating on the region R extending toward any one of the plurality of branch intake pipes 62. Condensed water can be prevented from concentrating and flowing into any one of the branch intake pipes 62.

  Further, in the second embodiment, as described above, the protrusion 164 at the downstream outlet 7c of the intercooler 7 has a plurality of outlet portions such that the downstream outlet 7c has a uniform flow rate of the intake air in plan view. It arrange | positions on the dividing line D (D11-D13) divided into E (E11-E14). Thereby, similarly to the said 1st Embodiment, it can carry out still more reliably to make condensed water flow in into the some branch intake pipe 62 equally.

  In the second embodiment, as described above, the plurality of protrusions 164 are formed in the width direction (X direction) orthogonal to the intake direction at the downstream outlet 7c of the intercooler 7. Further, the plurality of protrusions 164 and the inner surfaces (side surfaces 61e and 61f) in the width direction of the collective intake pipe 161 are formed so as to have a non-uniform interval in the width direction at the downstream outlet 7c of the intercooler 7. As a result, when the flow rate of the intake air passing through the collective intake pipe 161 (intercooler 7) is not constant in the width direction, the plurality of protrusions 164 and the collective intake pipe 161 spaced apart at an uneven interval in the width direction. By the side surfaces 61e and 61f, the downstream outlet 7c of the intercooler 7 can be appropriately divided into a plurality of outlet portions E so that the flow rate of the intake air becomes equal.

  Further, in the second embodiment, as described above, the plurality of protrusions 164 and the inner surfaces (side surfaces 61e and 61f) in the width direction of the collective intake pipe 161, and the widthwise intervals W12a and W13a in the central portion are end portions. In the downstream outlet 7c of the intercooler 7, a non-uniform interval is formed so as to be smaller than the interval W11a and W14a in the width direction. Thereby, when the flow rate of the intake air passing through the central portion in the collective intake pipe 161 (intercooler 7) is larger than the flow rate of the intake air passing through the end portion, the flow rate of the intake air is made uniform. The downstream outlet 7c of the intercooler 7 can be appropriately divided into a plurality of outlet portions E.

  Further, in the second embodiment, as described above, the plurality of protrusions 164 are formed so as to be spaced at a uniform interval toward the plurality of branch intake pipes 62 side. Thereby, even if the protrusion 164 affects the flow of the intake air, the intake air can be appropriately distributed to each branch intake pipe 62.

  In the second embodiment, as described above, a plurality of grooves 161g extending toward the plurality of branch intake pipes 62 are formed on the lower surface 161d of the inner surface 61c of the collective intake pipe 161. Thereby, when the condensed water is positioned in the groove 161g, it is possible to further restrict the movement of the condensed water from the region R on the one side separated by the protrusion 164 to the region R on the other side.

  In the second embodiment, as described above, the plurality of protrusions 164 are arranged between the plurality of branch intake pipes 62 on the side of the plurality of branch intake pipes 62 formed at uniform intervals in the width direction. Form so as to be positioned. Accordingly, the region R (R12 and R13) sandwiched between the pair of projections 164 and the region R (R11 and R14) sandwiched between the projection 164 and the inner surface (side surfaces 61e and 61f) of the collective intake pipe 161. Can correspond to one branch intake pipe 62. As a result, the condensed water can be made to uniformly flow into the plurality of branch intake pipes 62. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, the example in which the air intake apparatus of the present invention is applied to a multi-cylinder engine for automobiles is shown, but the present invention is not limited to this. You may apply the intake device of this invention to engines other than the engine for motor vehicles. In addition, as a multi-cylinder engine to which the intake device of the present invention is applied, an engine mounted on a transportation device (for example, a ship) in which a shift operation and a steering operation are performed is preferable.

  In the first embodiment, when the intake air flows substantially uniformly throughout the intercooler 7, the plurality of protrusions 64 are long in the width direction of the downstream outlet 7 c of the intercooler 7 in plan view. In this example, the downstream outlet 7c is divided into a plurality of (four) outlet portions E (E1 to E4) so that the lengths are uniform. Further, in the second embodiment, when the flow rate per unit area of the intake air at the central portion of the intercooler 7 is larger than the flow rate per unit area of the intake air at the end portion, the plurality of protrusions 164 are planar. In view, the downstream outlet 7c is divided into a plurality of (four) outlet portions E (E11) so that the length in the width direction at the center of the downstream outlet 7c of the intercooler 7 is smaller than the length in the width direction at the end. To E14). However, the present invention is not limited to this.

  In the present invention, the protrusion at the downstream outlet of the intercooler only needs to be positioned on a dividing line that divides the downstream outlet of the intercooler into a plurality of outlet portions so that the flow rate of the intake air becomes equal. For example, when the intake air is introduced from the vicinity of one end of the intercooler so that the intake air flow rate at one end of the intercooler is larger than the intake air flow rate at the other end, the protrusion is The dividing line that divides the downstream outlet of the intercooler into a plurality of outlet portions so that the flow rate of the intake air is evenly arranged is narrow on one end side and narrow on the other end side. Become.

  Moreover, in the said 1st and 2nd embodiment, since the water channel part 7b of the intercooler 7 is U-shaped, the several fin 7a formed at predetermined intervals in the width direction is cooled substantially equally. However, the present invention is not limited to this. In this invention, you may comprise so that the fin of the one side of the width direction may be cooled more easily than the fin of the other side because a water channel part is I-shaped. In this case, the amount of condensed water generated varies depending not only on the flow rate of the intake air but also on the ease with which the intake air is cooled. For this reason, it is preferable that the protruding portion partition the downstream outlet of the intercooler in plan view so that the amount of condensed water generated at the plurality of outlet portions is substantially equal. In such a case, the protrusion at the downstream outlet of the intercooler is positioned on a dividing line that divides the downstream outlet of the intercooler into a plurality of outlet portions so that the flow rate of the intake air is uniform in plan view. You don't have to.

  Moreover, although the example which provided the groove part 161g in the lower surface 161d of the collective intake pipe 161 was shown in the said 2nd Embodiment, this invention is not limited to this. In the present invention, in the configuration of the first embodiment, the groove portion of the second embodiment may be provided on the lower surface of the collective intake pipe.

  In the first and second embodiments, the lower surface 61d of the collective intake pipe 61 is shown to be inclined downward from the upstream side in the intake direction toward the downstream side. Not limited to. In the present invention, the lower surface of the inner surface of the intake manifold may be formed to include a horizontal or upward gradient. In addition, it is preferable to form at least the lower surface of the portion where the condensed water is generated in a horizontal or downward gradient.

  In the first and second embodiments, the example in which the configuration of the present invention is applied to the intake device 100 used in the engine 10 provided with four cylinders 10b has been described. However, the present invention is not limited to this. . In the present invention, the configuration of the present invention may be applied to an intake device used for an engine provided with two, three, or five or more cylinders. In addition, it is preferable to provide at least (number of cylinders-1) protrusions on the lower surface of the inner surface of the collective intake pipe. Thereby, it is possible to divide the lower surface of the collective intake pipe into the same number of regions as the cylinders or a larger number of regions than the cylinders by the protrusions.

  Moreover, in the said 1st and 2nd embodiment, although the example which formed the projection part 64 (164) was shown, this invention is not limited to this. In the present invention, one, two, or four or more protrusions may be formed.

  Moreover, in the said 1st and 2nd embodiment, although the protrusion part 64 (164) showed the example extended from the downstream exit 7c of the intercooler 7 to between the connection opening parts 63, this invention is limited to this. Absent. In the present invention, the protrusions do not have to extend between the connection openings.

  In the first and second embodiments, the example in which the protrusion height H1 from the lower surface 61d of the protrusion 64 is about 5 mm or more is shown, but the present invention is not limited to this. In the present invention, the protrusion height from the lower surface of the protrusion may be less than 5 mm.

  In the first and second embodiments, an example in which the EGR gas circulation unit 40 is an LPEGR type EGR gas circulation unit has been described, but the present invention is not limited to this. In the present invention, the EGR gas circulation part is an HP (High Pressure) EGR type EGR gas circulation part configured to recirculate the exhaust gas flowing in the pre-supercharger exhaust pipe to the compressed intake air. Also good.

  Moreover, in the said 2nd Embodiment, although the example which formed the projection part 164 in the waveform in planar view was shown, this invention is not limited to this. In the present invention, the protrusions may be formed so as to extend linearly in a direction intersecting the intake direction in plan view.

  Moreover, in the said 1st and 2nd embodiment, although the example which does not provide an EGR cooler in the EGR gas distribution part 40 was shown, this invention is not limited to this. In this invention, you may provide an EGR cooler in an EGR gas distribution part. In this case, since the intake air containing EGR gas can be cooled by the intercooler, it is not necessary to cool the intake air in the EGR cooler by the amount cooled by the intercooler. As a result, the EGR cooler can be sufficiently downsized.

6 Intake manifold (intake unit body)
7 Intercooler 7c Downstream outlet 10 Engine (multi-cylinder engine)
10b Cylinder 30 Supercharger 61, 161 Collecting intake pipe 61c Inner surface 61d, 161d Lower surface 62 Branch intake pipe 63 Connection opening 64, 164 Protrusion part 100, 200 Intake device 161g Groove part D Dividing line E Exit part

Claims (8)

An intake device for a multi-cylinder engine having a supercharger,
A collective intake pipe in which an intercooler for cooling the intake air flowing through the pipe is disposed in the pipe;
Branching downstream of the collective intake pipe, provided corresponding to a plurality of cylinders, and provided with a plurality of branched intake pipes through which intake air flows,
The air intake apparatus, wherein the collective intake pipe includes a protrusion that protrudes from a lower surface of an inner surface of the collective intake pipe and extends from a downstream outlet of the intercooler toward the plurality of branch intake pipes.   The protrusion at the downstream outlet of the intercooler is positioned on a dividing line that divides the downstream outlet of the intercooler into a plurality of outlet portions so that the flow rate of the intake air is uniform in plan view. The intake device according to claim 1. A plurality of the protrusions are formed in the width direction perpendicular to the intake direction at the downstream outlet of the intercooler,
The plurality of protrusions and the inner surface in the width direction of the collective intake pipe are formed so as to be spaced apart from each other in the width direction at the downstream outlet of the intercooler. The inhaler described.   The plurality of protrusions and the inner surface in the width direction of the collective intake pipe are arranged on the downstream side of the intercooler so that the width-direction interval at the center portion is smaller than the interval in the width direction at the end portion. The air intake device according to claim 3, wherein the air intake device is formed to have a non-uniform interval at the side outlet.   The plurality of protrusions are formed so as to be in a state of being spaced uniformly from the non-uniform interval at the downstream outlet of the intercooler toward the plurality of branch intake pipes. The intake device according to claim 3 or 4.   6. The intake device according to claim 1, wherein the collective intake pipe further includes a groove portion provided on a lower surface of an inner surface of the collective intake pipe and extending toward the plurality of branch intake pipes.   7. The projection according to claim 1, wherein the protrusion extends from the downstream outlet of the intercooler to a plurality of connection openings connected to the plurality of branch intake pipes. Inhalation device. The plurality of connection openings are formed at the lowermost end of the lower surface of the collective intake pipe,
The intake device according to claim 7, wherein the lower surface on which the protruding portion of the inner surface of the collective intake pipe is formed has a downward slope toward the plurality of connection openings.

Images