Engine intake duct

Abstract

To prevent water from entering the inside of the duct body. [Solution] The first divided body 30 has a protruding wall 38 that protrudes upward from the outer circumferential surface of the annular portion 32 and extends in the circumferential direction of the cylindrical main body portion 31. The second divided body 40 has a first extending wall 51 that extends upward from the joint end portion 42 along the protruding wall 38, a second extending wall 52 that extends from the first extending wall 51 and covers the protruding wall 38 above the vehicle, and a third extending wall 53 that extends downward from the second extending wall 52 toward the outer circumferential surface of the annular portion 32. The tip of the protruding wall 38 is in contact with the second extending wall 52, and the chamber 60 is defined by the outer circumferential surface of the annular portion 32, the protruding wall 38, the second extending wall 52, and the third extending wall 53.

Description

Technical Field

[0001] The present invention relates to an intake duct of an engine.

Background Art

[0002] The intake duct of an engine includes a cylindrical duct body. The duct body is arranged behind the vehicle with respect to the grill opening of the front grill in the engine room. The duct body is configured by aligning a first divided body and a second divided body so as to form a cylindrical shape, for example, as in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in such an intake duct of an engine, for example, the first divided body may have a cylindrical main body portion in which a window opening to the outer peripheral surface is formed. In such a case, the cylindrical main body portion has an annular portion that forms an edge located in the axial direction of the cylindrical main body portion at the window. The second divided body has a mating end portion that is abutted against the end surface of the annular portion in the axial direction of the duct body. Then, the second divided body closes the window in a state where the mating end portion is abutted against the end surface of the annular portion.

[0005] Here, for example, water may enter the engine compartment through the grille opening of the front grille during rainy weather or car washing. If this water enters the engine compartment through the grille opening, it may come into contact with the intake duct body. When water comes into contact with the duct body, the intake negative pressure from the engine may draw the water into the duct body through the gap between the end face of the annular part of the first divided part and the joint end of the second divided part. Water entering the duct body may cause engine malfunction. [Means for solving the problem]

[0006] The engine intake duct that solves the above problem is positioned in the engine compartment of the vehicle, rearward from the grille opening of the front grille, and comprises a cylindrical duct body formed by joining a first divided body and a second divided body to form a cylindrical shape, the first divided body has a cylindrical body portion with a window formed on its outer circumferential surface, the cylindrical body portion has an annular portion that forms an edge in the axial direction of the cylindrical body portion in the window, the second divided body has a joint end that abuts against the end face of the annular portion in the axial direction of the duct body, and the joint end abuts against the end face of the annular portion to close the window The intake duct for a din is configured such that the first segment has a protruding wall that projects upward from the outer circumferential surface of the annular portion and extends in the circumferential direction of the cylindrical main body, the second segment has a first extending wall that extends upward from the joint end along the protruding wall, a second extending wall that extends from the first extending wall in the axial direction of the duct body and covers the protruding wall above the vehicle, and a third extending wall that extends downward from the second extending wall toward the outer circumferential surface of the annular portion, the tip of the protruding wall is in contact with the second extending wall, and a chamber is defined by the outer circumferential surface of the annular portion, the protruding wall, the second extending wall, and the third extending wall.

[0007] According to this, the tip of the protruding wall is in contact with the second extending wall, and the chamber is defined by the outer surface of the annular portion, the protruding wall, the second extending wall, and the third extending wall. Therefore, the suction negative pressure from the engine that acts continuously from the gap between the end face of the annular portion of the first divided body and the joint end of the second divided body to the gap between the third extending wall and the outer surface of the annular portion is reduced by the chamber. As a result, it is possible to suppress the suction negative pressure from the engine from drawing water into the duct body through the gap between the end face of the annular portion of the first divided body and the joint end of the second divided body. Thus, it is possible to suppress the intrusion of water into the duct body.

[0008] In the intake duct of the engine described above, the surface of the protruding wall opposite to the first extending wall is preferably an inclined surface that moves away from the joint end as it moves away from the outer peripheral surface of the annular portion.

[0009] According to this, water that enters the chamber is less likely to flow along the surface of the protruding wall opposite to the first extending wall, towards the space between the tip of the protruding wall and the second extending wall. As a result, it becomes easier to further suppress the water that enters the chamber from being sucked into the interior of the duct body through the gap between the end face of the annular portion of the first divided body and the joined end of the second divided body by the negative suction pressure from the engine. Therefore, it becomes easier to further suppress the ingress of water into the interior of the duct body.

[0010] In the intake duct of the engine described above, the duct body is connected to an air cleaner, and the side of the third extending wall opposite to the chamber is preferably in contact with the housing of the air cleaner.

[0011] According to this, since the side of the third extending wall opposite to the chamber is in contact with the air cleaner housing, water that has come into contact with the duct body is less likely to seep into the gap between the third extending wall and the outer surface of the annular part. As a result, it is possible to further suppress the fact that water that has entered the chamber is sucked into the interior of the duct body through the gap between the end face of the annular part of the first divided body and the joint end of the second divided body by the suction negative pressure from the engine. Therefore, it is possible to further suppress the intrusion of water into the interior of the duct body.

[0012] In the intake duct of the engine described above, the second divided body has a fourth extending wall that extends upward from the second extending wall toward the vehicle, and the fourth extending wall is in contact with the housing. According to this, since the fourth extending wall is in contact with the air cleaner housing, water that has come into contact with the duct body is less likely to penetrate further into the gap between the third extending wall and the outer surface of the annular section. As a result, it is possible to further suppress the water that has entered the chamber from being sucked into the interior of the duct body through the gap between the end face of the annular section of the first divided body and the joint end of the second divided body by the suction negative pressure from the engine. Therefore, it is possible to further suppress the penetration of water into the interior of the duct body. [Effects of the Invention]

[0013] According to this invention, it is possible to suppress the intrusion of water into the inside of the duct body. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a schematic cross-sectional view showing the inside of the engine compartment in the embodiment. [Figure 2] Figure 2 is an exploded perspective view showing the relationship between the duct body and the air cleaner. [Figure 3] Figure 3 is an exploded perspective view showing a portion of the duct body. [Figure 4] Figure 4 is a perspective view showing a portion of the duct body. [Figure 5]Figure 5 is a cross-sectional view showing an enlarged portion of the duct body and a portion of the air cleaner housing. [Modes for carrying out the invention]

[0015] The following describes one embodiment of the engine intake duct with reference to Figures 1 to 5. The intake duct of this embodiment is located in the engine compartment of the vehicle. <Overview of the engine compartment> As shown in Figure 1, the engine compartment 11 of the vehicle 10 contains an engine 12, an intake duct 13, a condenser 14, a radiator 15, a cooling fan 16, an air cleaner 17, and a bumper reinforcement 18. The bumper reinforcement 18 supports the front bumper 19. Above the front bumper 19, the front grille 20 is positioned. The front grille 20 has a grille opening 21. The grille opening 21 opens into the engine compartment 11. The grille opening 21 communicates the inside and outside of the engine compartment 11.

[0016] The condenser 14, radiator 15, cooling fan 16, and air cleaner 17 are located in the engine compartment 11, towards the rear of the vehicle relative to the front bumper 19 and grille opening 21. The condenser 14, radiator 15, cooling fan 16, and air cleaner 17 are arranged in this order from the front to the rear of the vehicle within the engine compartment 11.

[0017] As shown in Figure 2, the air cleaner 17 includes a housing 27. The housing 27 is roughly rectangular in shape. An intake port 27a is formed in the housing 27. An exhaust port 27b is formed in the housing 27.

[0018] As shown in FIG. 1, when the engine 12 is operating, outside air is introduced into the engine room 11 through the grill opening 21. The air introduced into the engine room 11 from the grill opening 21 passes through the condenser 14 and the radiator 15. The cooling fan 16 increases the amount of air passing through the condenser 14 and the radiator 15. The air passing through the condenser 14 and the radiator 15 contributes to cooling the condenser 14 and the radiator 15.

[0019] The exhaust port 27b of the air cleaner 17 and the engine 12 are connected via a connecting pipe 22. An air flow meter 23 is provided in the connecting pipe 22. The air flow meter 23 detects the amount of air sucked into the engine 12. Specifically, the air flow meter 23 is configured to be able to detect the amount of air flowing in the connecting pipe 22.

[0020] The engine 12 is driven and controlled by an ECU 24. The ECU 24 is an electronic control unit including a CPU (central processing control device), a memory that stores various programs, various information, maps, etc. in advance, an input interface, an output interface, etc. The air flow meter 23 is electrically connected to the ECU 24. Then, information regarding the amount of air detected by the air flow meter 23 is transmitted to the ECU 24. A control program for controlling the driving of the engine 12 is stored in the ECU 24 in advance based on the information regarding the amount of air transmitted from the air flow meter 23.

[0021] <Intake duct> The intake duct 13 includes a cylindrical duct body 25. The duct body 25 is disposed behind the vehicle with respect to the grill opening 21 of the front grill 20 in the engine room 11 of the vehicle 10.

[0022] The duct body 25 has an air intake port 26. The air intake port 26 opens at the first end of the duct body 25. The air intake port 26 is located in the engine compartment 11, rearward relative to the front grille 20. The air intake port 26 is located above the cooling fan 16. The air intake port 26 opens toward the front grille 20. The second end of the duct body 25 is located rearward relative to the cooling fan 16 and is connected to the air intake port 27a of the air cleaner 17. Therefore, the duct body 25 is connected to the air cleaner 17. A portion of the duct body 25 is located rearward relative to the cooling fan 16.

[0023] A portion of the air introduced into the engine compartment 11 through the grille opening 21 is drawn into the duct body 25 via the intake port 26. The air drawn into the duct body 25 is introduced into the air cleaner 17 and purified by the air cleaner 17. The air purified by the air cleaner 17 is then drawn into the engine 12 via the connecting pipe 22.

[0024] As shown in Figures 3 and 4, the duct body 25 comprises a first segment 30 and a second segment 40. The duct body 25 is constructed by joining the first segment 30 and the second segment 40 to form a cylindrical shape. The second segment 40 is positioned above the vehicle relative to the first segment 30. The first segment 30 and the second segment 40 are made of resin material.

[0025] As shown in Figure 3, the first divided body 30 has a cylindrical main body portion 31. The cylindrical main body portion 31 has an annular portion 32 and a half-split portion 33. The annular portion 32 is a square ring. The first end of the annular portion 32 forms the first end of the cylindrical main body portion 31.

[0026] As shown in Figure 5, the first end of the annular portion 32 is connected to the intake port 27a of the air cleaner 17. The space between the first end of the annular portion 32 and the intake port 27a is sealed by an annular sealing member 28. The second end of the annular portion 32 protrudes from the intake port 27a.

[0027] As shown in Figure 3, the split portion 33 extends from a portion of the annular portion 32 in the circumferential direction. The split portion 33 extends from the end face 32a of the annular portion 32. The split portion 33 forms the portion of the cylindrical main body 31 excluding the annular portion 32. The end of the split portion 33 opposite to the annular portion 32 forms the second end of the cylindrical main body 31.

[0028] Multiple locking portions 34 are provided in the split portion 33. Each locking portion 34 protrudes from both ends of the split portion 33 in the circumferential direction on the outer surface of the split portion 33. Each locking portion 34 is spaced apart from each other in the axial direction of the split portion 33. A locking hole 35 is formed in each locking portion 34.

[0029] A window 36 is formed in the cylindrical main body portion 31. The window 36 opens onto the outer circumferential surface of the cylindrical main body portion 31. The window 36 is located on both sides in the circumferential direction of the split portion 33 and is formed by the end edges 37 that are continuous with the inner circumferential surface of the split portion 33 and the end edge 32e of the end face 32a of the annular portion 32. Therefore, the annular portion 32 forms an edge in the window 36 that is located in the axial direction of the cylindrical main body portion 31.

[0030] The second divided body 40 is shaped like a half-cylinder. The second divided body 40 has a pair of side ends 41. Both side ends 41 extend in the axial direction of the second divided body 40. Both side ends 41 abut against the circumferential ends of the half-split portion 33 of the first divided body 30 in the circumferential direction of the duct body 25.

[0031] The second divided body 40 has a joint end 42. The joint end 42 is a first end located on one side of the second divided body 40 in the axial direction. The joint end 42 connects the first end sides of the second divided body 40 at both end ends 41. The joint end 42 abuts against the end face 32a of the annular portion 32 of the first divided body 30 in the axial direction of the duct body 25. Therefore, the joint end 42 is the end located on the annular portion 32 side of the second divided body 40.

[0032] The second segmented body 40 is provided with multiple locking claws 43. Each locking claw 43 protrudes from both end portions 41. Each locking claw 43 is configured to be insertable into each locking hole 35.

[0033] As shown in Figure 4, each locking claw 43 is inserted into each locking hole 35 with both end portions 41 abutting against the circumferential ends of the split portion 33 and the joint end portion 42 abutting against the end face 32a of the annular portion 32. The first divided body 30 and the second divided body 40 are connected to each other by the locking claw 43 inserted into each locking hole 35 engaging with the area around each locking hole 35 in each locked portion 34.

[0034] As shown in Figures 3 and 4, the second divided body 40 closes the window 36 with both end portions 41 abutting against both circumferential ends of the half-split portion 33, and the joining end portion 42 abutting against the end face 32a of the annular portion 32. The intake duct 13 is located in the engine compartment 11 with one end portion 41 positioned towards the front of the vehicle and the other end portion 41 positioned towards the rear of the vehicle.

[0035] <Protruding wall, first extending wall, second extending wall, third extending wall, chamber> As shown in Figure 5, the first divided body 30 has a protruding wall 38. The protruding wall 38 protrudes upward from the outer circumferential surface of the annular portion 32. The protruding wall 38 is continuous with the edge 32e of the end face 32a of the annular portion 32. As shown in Figure 3, the protruding wall 38 extends in the circumferential direction of the cylindrical body portion 31. One end of the cylindrical body portion 31 in the protruding wall 38 is continuous with one end of the split portion 33 in the circumferential direction. The other end of the cylindrical body portion 31 in the protruding wall 38 is continuous with the other end of the split portion 33 in the circumferential direction.

[0036] As shown in Figure 5, the protruding wall 38 extends upward of the vehicle, inclined in a direction that approaches the first end of the annular portion 32 as it moves away from the outer circumferential surface of the annular portion 32. The surface of the protruding wall 38 located on the window 36 side is inclined in a direction that approaches the first end of the annular portion 32 as it moves away from the end face 32a of the annular portion 32. The surface of the protruding wall 38 located on the opposite side of the window 36 is inclined in a direction that approaches the first end of the annular portion 32 as it moves away from the outer circumferential surface of the annular portion 32.

[0037] The second segment 40 has a first extending wall 51, a second extending wall 52, and a third extending wall 53. The first extending wall 51 extends upward from the joint end 42 along the protruding wall 38 toward the vehicle. As shown in Figure 3, the first extending wall 51 extends in the circumferential direction of the second segment 40. One circumferential end of the second segment 40 in the first extending wall 51 is continuous with one of the side ends 41. The other circumferential end of the second segment 40 in the first extending wall 51 is continuous with the other of the side ends 41.

[0038] As shown in Figure 5, the first extending wall 51 extends along the surface of the protruding wall 38 that is located on the window 36 side. The surface of the protruding wall 38 that is located on the opposite side of the window 36 is the surface of the protruding wall 38 that is opposite to the first extending wall 51. The surface of the protruding wall 38 that is opposite to the first extending wall 51 is an inclined surface that moves away from the outer circumferential surface of the annular portion 32 and further away from the joint end portion 42.

[0039] The second extending wall 52 extends axially from the end opposite to the joint end 42 of the first extending wall 51 toward the first end of the annular portion 32 towards the duct body 25. Thus, the second extending wall 52 extends axially from the first extending wall 51 toward the duct body 25. As shown in Figure 3, the second extending wall 52 extends circumferentially from the second divided body 40. One circumferential end of the second extending wall 52 toward the second divided body 40 is continuous with one of the two end portions 41. The other circumferential end of the second extending wall 52 toward the second divided body 40 is continuous with the other of the two end portions 41.

[0040] As shown in Figure 5, the second extending wall 52 is above the vehicle and passes over the protruding wall 38. The second extending wall 52 covers the protruding wall 38 above the vehicle. The tip of the protruding wall 38 is in contact with the second extending wall 52.

[0041] The third extending wall 53 extends downward from the end of the second extending wall 52 opposite to the first extending wall 51 toward the outer circumferential surface of the annular portion 32. Thus, the third extending wall 53 extends downward from the second extending wall 52 toward the outer circumferential surface of the annular portion 32. As shown in Figure 3, the third extending wall 53 extends in the circumferential direction of the second divided body 40. As shown in Figure 5, the tip of the third extending wall 53 is spaced apart from the outer circumferential surface of the annular portion 32. The chamber 60 is defined by the outer circumferential surface of the annular portion 32, the protruding wall 38, the second extending wall 52, and the third extending wall 53. The side of the third extending wall 53 opposite to the chamber 60 is in contact with the housing 27 of the air cleaner 17.

[0042] <4th extension wall> The second segment 40 has a fourth extending wall 54. The fourth extending wall 54 extends upward from a portion of the outer surface of the second extending wall 52 that is closer to the third extending wall 53 and located above the vehicle. The fourth extending wall 54 extends while inclining in a direction away from the first extending wall 51 as it moves away from the outer surface of the second extending wall 52. In this way, the fourth extending wall 54 extends upward from the second extending wall 52. The fourth extending wall 54 extends in the circumferential direction of the second segment 40. The fourth extending wall 54 is in contact with the housing 27 of the air cleaner 17.

[0043] [Effect of the Embodiment] Next, the operation of the embodiment will be described. Incidentally, for example, water may enter the engine compartment 11 through the grille opening 21 of the front grille 20 during rainy weather or when washing the car. When this happens, the water that enters the engine compartment 11 through the grille opening 21 may pass through the condenser 14 and radiator 15 together with the air introduced into the engine compartment 11 through the grille opening 21 and come into contact with the duct body 25 of the intake duct 13. In particular, the operation of the cooling fan 16 causes the water that has passed through the condenser 14 and radiator 15 to be blown onto the duct body 25. When water comes into contact with the duct body 25 in this way, the intake negative pressure from the engine 12 may cause the water to be drawn into the interior of the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40.

[0044] At this time, the tip of the protruding wall 38 is in contact with the second extending wall 52, and the chamber 60 is defined by the outer circumferential surface of the annular portion 32, the protruding wall 38, the second extending wall 52, and the third extending wall 53. Therefore, the suction negative pressure from the engine 12 that acts continuously from the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 to the gap between the third extending wall 53 and the outer circumferential surface of the annular portion 32 is reduced by the chamber 60. As a result, the suction negative pressure from the engine 12 prevents water from being sucked into the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40.

[0045] Furthermore, the surface of the protruding wall 38 opposite to the first extending wall 51 is an inclined surface that moves away from the joint end 42 as it moves away from the outer circumferential surface of the annular portion 32. As a result, water that enters the chamber 60 is less likely to flow along the surface of the protruding wall 38 opposite to the first extending wall 51 towards the space between the tip of the protruding wall 38 and the second extending wall 52. Consequently, it is even easier to suppress the water that enters the chamber 60 from being sucked into the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 by the suction negative pressure from the engine 12.

[0046] Furthermore, since the side of the third extending wall 53 opposite to the chamber 60 is in contact with the housing 27 of the air cleaner 17, water that has come into contact with the duct body 25 is less likely to seep into the gap between the third extending wall 53 and the outer surface of the annular portion 32. As a result, it is even easier to suppress the fact that water that has entered the chamber 60 is sucked into the interior of the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 by the suction negative pressure from the engine 12.

[0047] Furthermore, because the fourth extending wall 54 is in contact with the housing 27 of the air cleaner 17, water that has come into contact with the duct body 25 is less likely to penetrate into the gap between the third extending wall 53 and the outer surface of the annular portion 32. As a result, it is even easier to suppress the water that has entered the chamber 60 from being sucked into the interior of the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 by the suction negative pressure from the engine 12.

[0048] [Effects of the Embodiment] The above embodiment can be achieved to obtain the following effects. (1) The tip of the protruding wall 38 is in contact with the second extending wall 52, and the chamber 60 is defined by the outer circumferential surface of the annular portion 32, the protruding wall 38, the second extending wall 52, and the third extending wall 53. Therefore, the suction negative pressure from the engine 12 that acts continuously from the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 to the gap between the third extending wall 53 and the outer circumferential surface of the annular portion 32 is reduced by the chamber 60. As a result, it is possible to suppress the suction negative pressure from the engine 12 from drawing water into the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40. Therefore, it is possible to suppress the intrusion of water into the duct body 25.

[0049] (2) The surface of the protruding wall 38 opposite to the first extending wall 51 is an inclined surface that moves away from the joint end 42 as it moves away from the outer circumferential surface of the annular portion 32. This makes it difficult for water that has entered the chamber 60 to flow along the surface of the protruding wall 38 opposite to the first extending wall 51 towards the space between the tip of the protruding wall 38 and the second extending wall 52. As a result, it is possible to further suppress the water that has entered the chamber 60 from being sucked into the interior of the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 by the suction negative pressure from the engine 12. Thus, it is possible to further suppress the ingress of water into the interior of the duct body 25.

[0050] (3) Since the side of the third extending wall 53 opposite to the chamber 60 is in contact with the housing 27 of the air cleaner 17, water that has come into contact with the duct body 25 is less likely to seep into the gap between the third extending wall 53 and the outer surface of the annular portion 32. As a result, it is possible to further suppress the water that has entered the chamber 60 from being sucked into the interior of the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 by the suction negative pressure from the engine 12. Thus, it is possible to further suppress the intrusion of water into the interior of the duct body 25.

[0051] (4) Because the fourth extending wall 54 is in contact with the housing 27 of the air cleaner 17, water that has come into contact with the duct body 25 is less likely to penetrate further into the gap between the third extending wall 53 and the outer surface of the annular portion 32. As a result, it is possible to further suppress the water that has entered the chamber 60 from being sucked into the interior of the duct body 25 through the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 by the suction negative pressure from the engine 12. Thus, it is possible to further suppress the penetration of water into the interior of the duct body 25.

[0052] (5) According to this embodiment, in order to prevent water from entering the inside of the duct body 25, it is not necessary to separately provide a sealing material to seal the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40. Therefore, the number of parts of the intake duct 13 can be reduced, and thus costs can be reduced. Furthermore, even if a sealing material is provided in the gap between the end face 32a of the annular portion 32 of the first divided body 30 and the joint end 42 of the second divided body 40 to prevent water from entering the inside of the duct body 25, the problem of water entering the inside of the duct body 25 due to deterioration of the sealing material over time can be avoided.

[0053] (6) Since water can be prevented from entering the inside of the duct body 25, problems such as steam or water droplets adhering to the air flow meter 23 and causing condensation on the air flow meter 23 can be avoided. As a result, problems such as difficulty in accurately detecting the amount of air by the air flow meter 23 can be avoided, and thus malfunctions of the engine 12 can be avoided.

[0054] [Example of changes] The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0055] ○ In this embodiment, the surface of the protruding wall 38 that is located on the opposite side from the first extending wall 51 does not need to be inclined. ○ In this embodiment, the surface of the protruding wall 38 that is located on the opposite side of the first extending wall 51 may be an inclined surface that approaches the joint end 42 as it moves away from the outer peripheral surface of the annular portion 32.

[0056] ○ In this embodiment, the side of the third extending wall 53 opposite to the chamber 60 may be spaced apart from the housing 27 of the air cleaner 17. ○ In this embodiment, the fourth extending wall 54 may be spaced apart from the housing 27 of the air cleaner 17.

[0057] ○ In this embodiment, the second divided body 40 does not need to have the fourth extending wall 54. [Explanation of symbols]

[0058] 10...Vehicle, 11...Engine room, 12...Engine, 13...Intake duct, 17...Air cleaner, 20...Front grille, 21...Grille opening, 25...Duct body, 27...Housing, 30...First segment, 31...Cylindrical body section, 32...Annular section, 32a...End face, 36...Window, 38...Protruding wall, 40...Second segment, 42...Joint end, 51...First extending wall, 52...Second extending wall, 53...Third extending wall, 54...Fourth extending wall, 60...Chamber.

Claims

1. It comprises a cylindrical duct body positioned in the engine compartment of the vehicle, rearward relative to the grille opening of the front grille, and formed by joining a first divided body and a second divided body to form a cylindrical shape. The first divided body has a cylindrical main body portion with a window formed on its outer surface, The cylindrical body portion has an annular portion that forms an edge located in the axial direction of the cylindrical body portion in the window, The second divided body has a mating end that abuts against the end face of the annular portion in the axial direction of the duct body, and is an engine intake duct that closes the window when the mating end is abutting against the end face of the annular portion, The first divided body has a protruding wall that extends upward from the outer circumferential surface of the annular portion toward the vehicle and extends in the circumferential direction of the cylindrical main body portion. The second division is A first extending wall extends upward from the joint end along the protruding wall toward the vehicle, A second extending wall extends from the first extending wall in the axial direction of the duct body and covers the protruding wall above the vehicle, It has a third extending wall that extends downward from the second extending wall toward the outer circumferential surface of the annular portion toward the vehicle, The tip of the protruding wall is in contact with the second extending wall. An engine intake duct characterized in that the chamber is defined by the outer circumferential surface of the annular portion, the protruding wall, the second extending wall, and the third extending wall.

2. The intake duct for an engine according to claim 1, characterized in that the surface of the protruding wall located on the opposite side of the first extending wall is an inclined surface that moves away from the joint end as it moves away from the outer peripheral surface of the annular portion.

3. The duct body is connected to the air cleaner, The intake duct for an engine according to claim 1 or 2, characterized in that the surface of the third extending wall opposite to the chamber is in contact with the housing of the air cleaner.

4. The second divided body has a fourth extending wall that extends upward from the second extending wall toward the vehicle, The intake duct for an engine according to claim 3, characterized in that the fourth extending wall is in contact with the housing.

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