JP2017074914A - Intake duct for on-vehicle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake duct for an on-vehicle engine that can inhibit water from being sucked to the engine even when water is intruded into the intake duct.SOLUTION: An intake duct 20 includes: an intake path portion 21; a connection path portion 26 for guiding air in the intake path portion 21 to an engine; and a front opening 24 and a rear opening 25 provided at positions overlapped with each other in a vehicle longitudinal direction in the intake path portion 21. In the intake duct 20, a first wall portion 27 and a second wall portion 28 extending in the longitudinal direction and opposing to each other in the width direction are provided between a position to which the connection path portion 26 is connected in the intake path portion 21 and a position having the front opening 24. The first wall portion 27 is provided over the entire longitudinal direction in the intake path portion 21, and the second wall portion 28 located on the front opening 24 side of the first wall portion 27 extends from a front end in the longitudinal direction in the intake path portion 21.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake duct that guides air to an in-vehicle engine.

  A front bumper having a front grill is provided at the front end of a vehicle such as an automobile. An intake duct for guiding air to the engine is provided on the vehicle rear side of the front bumper so as to open toward the front of the vehicle. Part of the air flowing into the engine room flows into the intake duct.

  In Patent Document 1, in a vehicle in which the opening of the intake duct is disposed on the vehicle upper side of the front grille, which is the opening of the front bumper, the opening of the intake duct extends below the intake duct so as to fill a gap with the front bumper. It has been proposed to provide a seal plate for partitioning between the front grille and the front grille. In such a vehicle, even when the water flowing into the engine room from the front grill is rolled up above the vehicle, the water is blocked by the seal plate, and the water moves upward from the seal plate. Since it is regulated, the intrusion of water into the intake duct is suppressed, and the intake of water into the engine is suppressed.

JP 2007-314008 A

  Here, the intake duct may be arranged in a state where the height of the opening and the height of the front grille are substantially the same. In such a case, if the seal plate for partitioning between the opening of the intake duct and the front grill is provided as described above, the intake duct is blocked by the seal plate, and the inflow of air into the intake duct is inhibited. Therefore, in such a case, the seal plate cannot be provided as described above. Also, when the water surface reaches the position of the intake duct opening, such as when traveling on a submerged channel, even if a seal plate is provided between the intake duct opening and the front grille, Infiltration of water into the duct cannot be avoided.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an in-vehicle engine intake duct capable of suppressing the intake of water into the engine even when water enters the intake duct. There is to do.

  An intake duct of an in-vehicle engine for achieving the above object is provided at a position where the intake passage portion extending in the vehicle width direction and the intake passage portion overlap each other in the vehicle front-rear direction. A front opening that opens toward the rear and a rear opening that opens toward the rear of the vehicle, and a position of the intake passage that is spaced apart from the position where the front opening and the rear opening are provided in the vehicle width direction. And a connection path portion that guides the air in the intake path portion to the engine, and guides the air to the engine. The intake duct is provided in a position between the position where the connection path portion in the vehicle width direction is connected and the position where the front opening is provided, inside the intake path portion. A pair of wall portions that are higher than the lower end portion and extend in the vehicle front-rear direction and face each other in the vehicle width direction are provided. Of the pair of wall portions, the first wall portion located on the connection path portion side is provided over the entire vehicle front-rear direction inside the intake passage portion, and is located on the front opening side. Extends from the front end in the vehicle longitudinal direction inside the intake passage portion.

  In the above configuration, when water flows into the intake duct from the front opening, such as when traveling on a submerged channel, the water flows to the rear of the vehicle by the flow and is discharged from the rear opening. . At this time, if the water level is lower than the second wall portion, the water flows along the second wall portion and is guided to the rear side of the vehicle, and the inflow to the connection path portion side is suppressed. As described above, according to the above configuration, the water flowing into the intake duct from the front opening passes through the intake duct and flows out from the rear opening to the outside of the intake duct. In addition, in the above configuration, the first wall portion that extends over the entire vehicle front-rear direction inside the intake passage portion is provided in a portion closer to the connection route portion than the second wall portion. A space defined by the first wall portion and the second wall portion facing each other is formed between the front opening and the connection path portion. Therefore, even when a part of the water flowing into the intake duct from the front opening passes over the second wall part and flows out to the connection path part side, the water can be stored in the space. In addition, water can be prevented from entering the connection path portion side. On the other hand, a part of the air flowing into the intake duct is sucked by the intake negative pressure acting on the intake passage portion via the connection passage portion, gets over the second wall portion and the first wall portion, and enters the connection passage portion. It flows in and is sucked into the engine via the connection path portion. In this way, according to the above configuration, although water enters the intake duct, air is sucked into the connection path portion while discharging the water to the outside, and the air is allowed to flow into the connection path portion. Inhalation of water into the engine can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows schematic structure of the engine room of the vehicle by which the air intake duct of one Embodiment was mounted. The top view of an intake duct. The side view of the intake duct seen from the arrow 3 direction of FIG. The side view of the intake duct which looked at the back opening from the back side. The longitudinal cross-sectional view around the protrusion part of an intake duct. The cross-sectional view around the protrusion part of an intake duct. The cross-sectional view around the protrusion of the intake duct in a state where water has flowed from the front opening. The cross-sectional view around the protrusion of the intake duct in a state where water has flowed into the space. FIG. 6 is a cross-sectional view of the vicinity of the protrusion of the intake duct with the front opening submerged.

Hereinafter, an embodiment of an intake duct of an in-vehicle engine will be described.
As shown in FIG. 1, the front portion of the vehicle 10 is an engine room 12 on which an engine 11 is placed. A front bumper 13 is attached to an end of the vehicle 10 on the front side (lower side in FIG. 1). Air flows into the engine room 12 through the opening of the front bumper 13 (front grill 14). An intake duct 20 is attached inside the engine room 12 at a position adjacent to the front bumper 13 on the rear side in the vehicle front-rear direction of the front bumper 13 (specifically, the front grille 14). The intake duct 20 is connected to the engine 11 via the air cleaner 15 and the intake manifold 16. The air flowing into the engine room 12 through the front grille 14 is guided to the engine 11 through the intake duct 20, the air cleaner 15, and the intake manifold 16 in this order.

Hereinafter, the structure of the intake duct 20 will be described in detail.
As shown in FIGS. 2 and 3, the intake duct 20 has an intake path portion 21 having a shape extending in the vehicle width direction (the left-right direction in FIGS. 2 and 3) as a path through which air passes. . An end portion on one side (the left side in FIGS. 2 and 3) of the intake path portion 21 is a protruding portion 22 (FIG. 3) having a shape protruding downward in the vehicle vertical direction. A portion corresponding to the protruding portion 22 in the lower wall portion (bottom wall portion 23) of the intake passage portion 21 has a shape extending at substantially the same height in the vehicle front-rear direction.

  The protrusion 22 has a front opening 24 (FIG. 3) that opens toward the front side in the vehicle front-rear direction and a rear opening 25 that opens toward the rear side. The front opening 24 and the rear opening 25 are provided at positions that overlap each other in the vehicle front-rear direction. Further, as shown in FIG. 4, the upper end portion (upper end portion 25A) of the rear opening 25 is higher than the upper end portion (upper end portion 24A) of the front opening 24 in the vehicle vertical direction. As described above, the front opening 24 and the rear opening 25 are provided.

  As shown in FIGS. 2 and 3, the intake duct 20 communicates with the vicinity of the end portion on the opposite side (right side in FIGS. 2 and 3) of the intake passage portion 21 as a route through which air passes. The connection path portion 26 is provided. The connection path portion 26 is connected to a position spaced in the vehicle width direction from the position where the front opening 24 (FIG. 3) and the rear opening 25 of the intake path portion 21 are provided. An end of the connection path portion 26 on the downstream side in the intake flow direction is connected to the air cleaner 15 (see FIG. 1).

  The intake duct 20 takes air into the interior through a front opening 24 and a rear opening 25 provided in the projecting portion 22, and guides the air in the intake passage portion 21 to the engine 11 through a connection route portion 26. It has become.

  As shown in FIGS. 5 and 6, a pair of wall portions extending in the vehicle front-rear direction (vertical direction in FIG. 6) and facing each other in the vehicle width direction (left-right direction in FIG. 6) are disposed inside the intake passage portion 21. (First wall portion 27 and second wall portion 28) are provided. Specifically, the first wall portion 27 and the second wall portion 28 are located within the intake passage portion 21 from a position where the connection passage portion 26 is connected in the vehicle width direction to a position where the front opening 24 is provided. It is provided at a position between. Further, the upper end portion 27A (FIG. 5) of the first wall portion 27 and the upper end portion 28A of the second wall portion 28 are positioned higher than the lower end portion (lower end portion 24B) and the upper end portion 24A of the front opening 24. It has become.

  The first wall portion 27 is located closer to the connection path portion 26 than the second wall portion 28, and the front wall portion (front wall portion 29 [FIG. 6]) of the intake path portion 21 and the rear side wall. It is provided over the entire vehicle front-rear direction inside the intake passage portion 21 so as to connect the portion (rear wall portion 30). Further, the first wall portion 27 constitutes a side wall on the part side connected to the connection path portion 26 of the protruding portion 22. Specifically, the bottom wall portion 23 of the intake passage portion 21 has a stepped shape in which a portion corresponding to the protruding portion 22 is low and a portion connected to the connecting route portion 26 is higher than the protruding portion 22. The wall portion extending in the vertical direction is the first wall portion 27. The second wall portion 28 is parallel to the first wall portion 27 inside the projecting portion 22 of the intake passage portion 21 and extends from the vehicle front-rear direction front end (front wall portion 29) to the front wall portion 29 inside the intake passage portion 21. And extends to a position between the rear wall portion 30 and the rear wall portion 30.

  In addition, a plurality of ribs 31 extending in the vehicle front-rear direction and parallel in the vehicle width direction are provided on a portion corresponding to the inner surface of the protruding portion 22 in the bottom wall portion 23 of the intake passage portion 21. The heights of the protruding ends of the ribs 31 in the vehicle vertical direction are lower than the upper end portion 27A of the first wall portion 27 and the upper end portion 28A of the second wall portion 28.

  Furthermore, the intake passage portion 21 opens toward the side of the vehicle 10 (the left side in FIGS. 5 and 6) at the wall portion (side wall portion 32) that forms the tip on the protruding portion 22 side in the vehicle width direction. A side opening 33 is provided. The side opening 33 is formed in a shape such that its lower end 33A is higher than the upper end 24A of the front opening 24.

Hereinafter, the effect | action by attaching the intake duct 20 to the vehicle 10 (FIG. 1) is demonstrated.
When the vehicle 10 travels on a submerged road, water accumulated on the road surface may be lifted by the front bumper 13 and flow into the engine room 12 from the front grill 14. In this case, water that flows into the engine room 12 from the front grill 14 may flow into the intake duct 20 through the front opening 24 of the intake duct 20.

  As shown in FIG. 3, the intake duct 20 is provided with a front opening 24 and a rear opening 25 at positions that overlap each other in the vehicle longitudinal direction. Therefore, as shown by an arrow in FIG. 6, even when water flows into the intake duct 20 from the front opening 24, the water flows backward by the flow force and flows from the rear opening 25 to the intake duct 20. Will be discharged to the outside. At this time, as shown in FIG. 7, if the water level in the intake duct 20 is lower than the upper end portion 28A of the second wall portion 28, the water flows along the second wall portion 28 and is guided to the rear side. The inflow of water to the connection path part 26 side is suppressed. Thus, the water that has flowed into the intake duct 20 from the front opening 24 passes through the intake duct 20 and flows out from the rear opening 25 to the outside of the intake duct 20.

  As shown in FIGS. 6 and 7, a plurality of ribs 31 extending in the vehicle front-rear direction are provided in a portion corresponding to the inner surface of the protruding portion 22 in the bottom wall portion 23 of the intake passage portion 21. Since these ribs 31 function as rectifying plates that regulate the flow of water in the longitudinal direction of the vehicle, the flow of water inside the intake duct 20 is rearward compared to the case where an intake duct having no ribs is employed. It will be suitably guided. Moreover, since the rib 31 also functions as a reinforcing member that reinforces the intake duct 20, the strength of the intake duct 20 is higher than that of an intake duct that does not have a rib.

  Here, even when the water level in the intake duct 20 is lower than the upper end portion 28A of the second wall portion 28, as shown in FIG. 8, when the water surface undulates due to the shaking of the vehicle 10, etc. In some cases, a part of the water in the intake duct 20 passes over the second wall portion 28 and flows out to the connection path portion 26 side (right side in FIG. 8).

  The intake duct 20 is provided with a first wall portion 27 that extends over the entire vehicle longitudinal direction inside the intake passage portion 21 at a position closer to the connection route portion 26 than the second wall portion 28. A space 34 defined by the first wall portion 27 and the second wall portion 28 facing each other is formed between the front opening 24 and the connection path portion 26. The front side of the space 34 is closed by a front wall portion 29 (see FIG. 6). Therefore, even when a part of the water in the intake duct 20 climbs over the second wall portion 28 and flows out to the connection path portion 26 side due to the wave of the water surface, the water can be accumulated in the space 34. In addition, it is possible to prevent water from entering the connection path portion 26 side from the space 34.

  As shown in FIG. 6, although the second wall portion 28 extending from the front wall portion 29 of the intake duct 20 is interrupted in the middle, the water flows forward due to the flow of water flowing in the intake duct 20. Since water hardly flows back to the side (lower side in FIG. 6), it is difficult for water to enter the space 34. Therefore, the interior of the space 34 is hardly filled with water flowing in from the interrupted portion of the second wall portion 28, and the connection path is more than the first wall portion 27 in the intake duct 20 by the space 34. The effect which suppresses the penetration | invasion of the water to the part 26 side can be maintained. In addition, since the second wall portion 28 is interrupted in the middle, if the vehicle 10 stops and water does not flow into the intake duct 20 because the water is no longer lifted by the front bumper 13 or the like, it accumulates in the space 34. Water flows out of the space 34 through the interrupted portion of the second wall portion 28. Thus, in the intake duct 20, the water that has entered the interior of the space 34 can be discharged out of the space 34 and removed.

  According to the intake duct 20, a part of the air that has flowed into the interior through the front opening 24 or the like is sucked by the intake negative pressure acting on the intake passage section 21 through the connection path section 26, so that the second wall The vehicle passes over the portion 28 and the first wall portion 27, flows into the connection path portion 26, and is sucked into the engine 11 through the connection path portion 26.

  Thus, in the vehicle 10, although water may enter the intake duct 20, the air is sucked into the connection path portion 26 while discharging the water to the outside, and the air is sucked into the connection path portion 26. On the other hand, the intake of water into the engine 11 can be suppressed.

In addition, the intake duct 20 has a structure capable of sending air to the engine 11 even when the front opening 24 is submerged.
As described above, when the vehicle 10 (FIG. 1) travels on the submerged road, the water on the road surface is lifted by the front bumper 13 and flows into the engine room 12 through the front grille 14. Therefore, the water level is high in a portion adjacent to the front grille 14 in the engine room 12, that is, a portion on the front side of the intake duct 20. On the other hand, the water that flows into the engine room 12 from the front grille 14 flows down in the engine room 12. Therefore, the water level does not become so high in the portion of the engine room 12 that is spaced rearward from the front grille 14. Therefore, as shown in FIG. 9, even if the front opening 24 formed in the front wall portion 29 of the intake duct 20 is submerged, the rear opening 25 formed in the rear wall portion 30 of the intake duct 20 is submerged. It is hard to do.

  Here, as the vehicle 10 moves forward, the water flowing inside the intake duct 20 flows in from the front opening 24, so that the water level inside the intake duct 20 is almost the same height as the upper end portion 24A of the front opening 24 (FIG. 9). It is easy to be limited to (height shown in). In the intake duct 20, the upper end portion 25 </ b> A of the rear opening 25 is higher than the upper end portion 24 </ b> A of the front opening 24. Therefore, in the intake duct 20, even when the front opening 24 is submerged, a gap (indicated by S in FIG. 9) is formed between the water surface in the intake duct 20 and the upper end of the rear opening 25. Therefore, in the intake duct 20, when the front opening 24 is submerged, air can be caused to flow into the intake duct 20 through the rear opening 25 (specifically, the gap S), and the intake path of the intake duct 20. Air can be supplied to the engine 11 through the section 21 and the connection path section 26.

  Further, as described above, when the vehicle 10 (FIG. 1) travels on the submerged channel, the water level on the front side of the intake duct 20 in the engine room 12 becomes high, but the water level in the portion separated rearward from the front grill 14 is Not so high. Therefore, as shown in FIG. 9, although the side opening 33 is formed in the side wall portion 32 of the intake duct 20, the water lifted by the front bumper 13 hardly reaches the side opening 33. It can be said that it is difficult to enter the intake duct 20 through the opening 33. Moreover, in the intake duct 20, the lower end portion 33 </ b> A of the side opening 33 is higher than the upper end portion 24 </ b> A of the front opening 24. Therefore, even when the water level at the front end of the engine room 12 becomes so high that the front opening 24 is submerged, it is difficult for water to reach the side opening 33, and the water enters the intake duct 20 through the side opening 33. It is hard to penetrate. Therefore, air can be introduced into the intake duct 20 through the side opening 33.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Although water intrudes into the intake duct 20, the air flows into the connection path portion 26 so that the air is sucked into the connection path portion 26 while discharging the water to the outside. Inhalation of water can be suppressed.

The above embodiment may be modified as follows.
The second wall portion 28 may have a shape extending over the entire vehicle longitudinal direction inside the intake passage portion 21, in other words, a shape connecting the front wall portion 29 and the rear wall portion 30. Even in such a configuration, a part of the water flowing into the intake duct 20 from the front opening 24 flows over the second wall portion 28 and flows out to the portion connected to the connection path portion 26 due to the water surface undulating. However, the water can be stored in the space 34, and water can be prevented from entering the connection path portion 26 side of the space 34.

  The intake duct may be configured such that the portion of the intake path portion 21 to which the connection path portion 26 is connected and the first wall portion 27 are adjacent to each other. Since the length of the intake duct in the vehicle width direction can be shortened as the distance between the portion of the intake path portion 21 to which the connection path portion 26 is connected and the first wall portion 27 is closer, the intake duct can be reduced. A compact structure can be obtained.

The rib 31 formed in the intake passage portion 21 may be omitted.
The upper end 24A of the front opening 24 may be higher than the upper end 25A of the rear opening 25. According to such a configuration, when the front opening 24 is not submerged and the water level in the intake duct is equal to or lower than the height of the upper end portion 25A of the rear opening 25, the water flow hits the rear wall portion 30. Since the discharge of water to the outside of the intake duct is not hindered, the water can be discharged from the intake duct without causing an increase in the water level. At this time, air can also flow into the intake duct through a gap between the upper end 24A of the front opening 24 and the water surface.

  The height of the upper end portion 27 </ b> A of the first wall portion 27 and the height of the upper end portion 28 </ b> A of the second wall portion 28 may be less than or equal to the height of the upper end portion 24 </ b> A of the front opening 24. In such a configuration, the water level in the intake duct may be higher than the upper end portion 27 </ b> A of the first wall portion 27 and the upper end portion 28 </ b> A of the second wall portion 28. However, when the water level in the intake duct is lower than the upper end portion 27A of the first wall portion 27, the inflow of water to the connection path portion 26 side in the intake path portion 21 rather than the first wall portion 27 is suppressed. be able to. Further, when the water level in the intake duct is lower than the upper end portion 28A of the second wall portion 28, the space 34 is used to move the intake passage portion 21 from the first wall portion 27 to the connection route portion 26 side. The inflow of water can be suitably suppressed.

  -The part in which the front opening 24 and the rear opening 25 are formed does not need to be the shape which protruded in the downward side in the intake passage part 21. FIG. In this case, one side surface of the portion of the first wall portion 27 protruding from the bottom wall portion 23 of the intake passage portion 21 forms a part of the space 34, and the other side surface is more than the first wall portion 27. It becomes the shape which makes a part of inner surface of the part by the side of the connection path | route part 26. FIG.

  The height of the lower end 33 </ b> A of the side opening 33 may be equal to or less than the height of the upper end 24 </ b> A of the front opening 24. Even in such a configuration, when the upper end portion (upper end portion) of the side opening is higher than the upper end portion 24A of the front opening 24, the side opening is not affected even when the front opening 24 is submerged. There is a high possibility of not being submerged. If the side opening is not submerged, air can be introduced into the intake duct through the side opening.

  -The side opening 33 may be omitted. Even with such a configuration, air can be caused to flow into the intake passage portion 21 via the front opening 24 and the rear opening 25, and air can be supplied to the engine 11.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Engine, 12 ... Engine room, 13 ... Front bumper, 14 ... Front grille, 15 ... Air cleaner, 16 ... Intake manifold, 20 ... Intake duct, 21 ... Intake passage part, 22 ... Projection part, 23 ... Bottom wall part 24 ... Front opening 24A ... Upper end part 24B ... Lower end part 25 ... Rear opening 25A ... Upper end part 26 ... Connection path part 27 ... First wall part 27A ... Upper end part 28 ... First 2 walls, 28A ... upper end, 29 ... front wall, 30 ... rear wall, 31 ... rib, 32 ... side wall, 33 ... side opening, 33A ... lower end, 34 ... space.

Claims (1)

An intake path portion extending in the vehicle width direction;
A front opening that opens toward the front side of the vehicle and a rear opening that opens toward the rear side of the vehicle.
A connection path portion that is connected to a position spaced apart in the vehicle width direction from a position where the front opening and the rear opening are provided in the intake path section, and guides the air in the intake path section to the engine; An in-vehicle engine intake duct for guiding air to the engine,
It is provided in a position between the position where the connection path part in the vehicle width direction is connected and the position where the front opening is provided, inside the intake path part, from the lower end part of the front opening. A pair of wall portions extending in the vehicle longitudinal direction and facing each other in the vehicle width direction,
Of the pair of wall portions, the first wall portion located on the connection path portion side is provided over the entire vehicle front-rear direction inside the intake passage portion, and is located on the front opening side. The intake duct is characterized in that the portion extends from the front end in the vehicle longitudinal direction inside the intake passage portion.

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