JP3865248B2 - Intake duct of internal combustion engine and vehicle equipped with the intake duct - Google Patents

Description

  The present invention relates to an intake duct for taking in air supplied to an internal combustion engine from the atmosphere, and a vehicle equipped with the intake duct.

  Since an intake duct provided in an internal combustion engine mounted on a vehicle is usually disposed at the front of the vehicle, rainwater and splashes of splashed water are likely to enter from the entrance. For example, the air intake duct disclosed in Patent Document 1 is arranged above a radiator provided at the front part of the vehicle body, and rainwater or the like entering from a gap formed above the radiator faces the front upper part of the vehicle body. There are cases where the air intake duct enters from the opening portion for opening the atmosphere. If the water that has entered the intake duct reaches the air cleaner connected to the downstream side through the intake duct, there is a possibility that an appropriate amount of air necessary for combustion in the internal combustion engine cannot be secured.

Therefore, in order to prevent water that has entered the air intake duct from reaching the air cleaner, a technique is known in which a water drain hole is provided in the air intake duct and the water that has entered through the water drain hole is discharged outside the air intake duct. Yes. For example, in the inlet base of the air cleaner disclosed in Patent Document 2, an air / water separator plate to which water that has entered from the air inlet hits is provided. And the water which fell on the air-water separation board and fell below is discharged | emitted outside from an inlet base through the drain hose connected to the bottom part of an inlet base.
Utility Model Registration No. 2513875 Japanese Patent Publication No. 7-73981

  In the prior art of Patent Document 2, since there is an air / water separation plate as a partition wall in the inlet base, the air flow flowing in from the intake port is bent by the air / water separation plate and further below the air / water separation plate. Since it turns and flows around to the opposite side, the intake passage becomes complicated and the ventilation resistance increases. Further, the water that has entered from the air inlet hits the air / water separation plate, falls on the bottom of the inlet base, flows on the bottom, and then is discharged to the outside through a drain hose provided in the bottom. Therefore, it is difficult to discharge water quickly. Further, it is not considered to discharge water that has not hit the steam-water separation plate or water that has not been discharged through the drain hole. Furthermore, it is not considered that the water that goes to the inlet inlet of the inlet base together with outside air is difficult to enter from the inlet.

The present invention has been made in view of such circumstances, the invention of claim 1 7 wherein the the water entering the air intake duct Upon discharged from the drain hole, and suppressing an increase in ventilation resistance In addition, it aims at improving drainage. Furthermore, the invention according to claim 1 enables additional drainage of the invaded water by the additional drainage hole, promotes drainage, prevents or suppresses the intrusion of water from the additional drainage hole, and further adds specific amount of air with the aim of promoting the securing, intended to facilitate the mounting of the member forming the inlet of the air passage formed by the intake duct, according to claim 3 - 5 the described invention, the intake duct In the vehicle in which the air is mounted, the invention described in claims 4 and 5 is intended to prevent water conveyed to the outside airflow from entering the intake duct, and to secure the amount of air flowing into the intake duct. is intended to facilitate, invention according to claim 6, by using the structure to avoid interference between the intake duct and the member, intended to increase the rigidity of the duct wall of the intake duct, according to claim 7, wherein The invention behind the vehicle The purpose is to facilitate drainage by allowing additional drainage of invading water through an additional drain hole that opens to face.

The invention according to claim 1 is located between the inlet through which the outside air flows in, the outlet through which the air toward the air cleaner flows out, the inlet and the outlet, and the air flow from the inlet is bent to the outlet. In an intake duct of an internal combustion engine that forms an air passage having a bent passage section that faces the intake duct, the intake duct is a duct wall that forms the bent passage section, and in the inflow direction of air from the inlet in a plan view An opposing wall that faces the inlet; and a drainage portion that forms a drainage hole that opens downward to discharge water that has entered the air passage from the inlet to the outside. In a plan view, it is located between the inlet and the opposing wall and overlaps with the bent passage portion, and forms a downstream passage portion located between the bent passage portion and the outlet in the air passage. Duck to An additional water drain hole is formed in the wall, and the additional water drain hole opens in the same direction as the inflow direction at a position where it does not overlap the inlet in the bending direction of the air flow in the bent passage portion, and intake noise muffling section having a silencer chamber to reduce is below said additional water drain hole is the intake duct of an internal combustion engine that protrude in the same direction as the flowing direction at a position overlapping the entire additional water drain hole in plan view .

  According to this, the water that has entered the intake duct together with the outside air from the inlet has a higher density than the air, and therefore hits the opposing wall that forms the bent passage portion due to its inertia. The water that hits the opposing wall will adhere to the opposing wall and flow down the opposing wall, or fall away from the opposing wall and overlap with the bent passage portion between the inlet and the opposing wall in plan view. It is quickly discharged from a certain drain hole to the outside of the intake duct. Moreover, since the opposing wall is the duct wall of the intake duct, the bent passage portion that is the air passage is not complicated.

Furthermore , the water that has passed through the bent passage portion without being discharged from the drain hole flows in the downstream passage portion together with the air while adhering to the duct wall connected to the opposing wall, and is discharged to the outside through the additional drain hole. Is done. In addition, by using a muffler provided projecting just below the additional drain hole, it is prevented or suppressed that water from below enters the intake duct through the additional drain hole. Further, when the entrance or the bent passage portion is partially blocked by water, foreign matter, or the like, and it becomes difficult for air to pass through, outside air can be taken into the intake duct through the additional drain hole.

The invention according to claim 2 is located between the inlet through which the outside air flows, the outlet through which the air toward the air cleaner flows out, and the inlet and the outlet, and the air flow from the inlet is bent to the outlet. In an intake duct of an internal combustion engine that forms an air passage having a bent passage section that faces the intake duct, the intake duct is a duct wall that forms the bent passage section, and in the inflow direction of air from the inlet in a plan view An opposing wall that faces the inlet; and a drainage portion that forms a drainage hole that opens downward to discharge water that has entered the air passage from the inlet to the outside. In plan view, the intake duct is provided between the inlet and the opposing wall and overlaps the bent passage portion, and the intake duct includes an introduction portion made of an elastic material having rubber-like elasticity that forms the inlet. , Bend through And a duct body part is formed by the protrusions formed on the duct body is fitted into the through hole formed in the inlet portion, of the internal combustion engine in which the inlet portion is mounted on the duct body It is an intake duct .

According to this, the same action as that of the first aspect of the invention is achieved by matters relating to the position of the drain hole. In order to attach the introduction part to the duct body, the protrusion of the duct body may be fitted into the through hole of the introduction part having rubber-like elasticity.

The invention according to claim 3 is located between the inlet through which the outside air flows, the outlet through which the air toward the air cleaner flows out, and the inlet and the outlet, and the air flow from the inlet is bent to the outlet. In a vehicle mounted with an intake duct of an internal combustion engine that forms an air passage having a bent passage section that faces the intake duct, the intake duct is a duct wall that forms the bent passage section and extends from the inlet in a plan view. An opposing wall that faces the inlet in the air inflow direction, and a drainage portion that forms a drain hole that opens downward to discharge water that has entered the air passage from the inlet to the outside, and The drain hole is provided between the inlet and the opposing wall in a plan view and is provided at a position overlapping the bent passage portion, and a part of the flow of outside air toward the inlet is directed to the inlet. Deviate from Deflecting member is a vehicle that is provided.

According to this, the same action as that of the first aspect of the invention is achieved by matters relating to the position of the drain hole. When the external airflow toward the inlet hits the deflecting member, the water conveyed to the external airflow hits the deflecting member due to its inertia and is separated from the outside air, and the outside air with less water flows toward the inlet.

According to a fourth aspect of the present invention, in the vehicle according to the third aspect , the deflection member is provided with a through passage that allows outside air to flow through the deflection member.

  According to this, a part of the external airflow toward the deflecting member is not deflected by the deflecting member, and passes through the deflecting member toward the inlet through the through passage.

According to a fifth aspect of the present invention, in the vehicle according to the third or fourth aspect , the deflecting member is only a portion of the inlet near the bending direction of the air flow in the bent passage portion, and in the bending direction. It is provided at a position overlapping the inlet.

  According to this, water entering from the portion near the bending direction at the inlet tends to flow downstream from the opposing wall and is difficult to discharge, but is transported by outside air toward the inlet portion near the bending direction. Due to its inertia, the water that hits the deflecting member is separated from the outside air, and the outside air with less water flows toward the inlet. And since a deflection | deviation member overlaps only a part of entrance, a part of external airflow goes to an entrance, without being deflected by a deflection | deviation member.

According to a sixth aspect of the present invention, in the vehicle according to any one of the third to fifth aspects, the duct wall of the intake duct includes a cooling water passage forming member extending from a radiator mounted on the vehicle. A recess for avoiding interference is formed.

  According to this, since the concave portion for avoiding interference with the cooling water passage forming member forms a locally bent portion on the duct wall, the rigidity of the duct wall is increased.

The invention according to claim 7 is located between the inlet through which the outside air flows, the outlet through which the air toward the air cleaner flows out, and the inlet and the outlet, and the air flow from the inlet is bent to the outlet. In a vehicle mounted with an intake duct of an internal combustion engine that forms an air passage having a bent passage section that faces the intake duct, the intake duct is a duct wall that forms the bent passage section and extends from the inlet in a plan view. An opposing wall that faces the inlet in the air inflow direction, and a drainage portion that forms a drain hole that opens downward to discharge water that has entered the air passage from the inlet to the outside, and The drain hole is located between the inlet and the opposing wall in a plan view and provided at a position overlapping the bent passage portion, and is located between the bent passage portion and the outlet in the air passage. Downstream passage An additional drain hole is formed in the rear wall of the vehicle, and the additional drain hole is a vehicle that opens rearward at a position that does not overlap the inlet in the bending direction of the air flow in the bent passage portion. is there.

According to this, the same action as that of the first aspect of the invention is achieved by matters relating to the position of the drain hole. Then, the water that has passed through the bent passage portion without being discharged from the drain hole flows in the downstream passage portion together with the air while adhering to the rear wall continuous to the opposing wall, and faces backward in the front-rear direction of the vehicle. It is discharged outside through the additional drain hole that is open. At this time, when the vehicle is accelerated, the backward inertial force acts on the water that has entered the downstream passage portion, thereby further promoting the discharge of water from the additional drain hole.

  According to invention of Claim 1, the following effect is show | played. In other words, the invading water hits the opposing wall and is quickly discharged from the drain hole to the outside of the intake duct, so that the drainage is improved and the air passage is not complicated, so that the ventilation resistance is reduced. Increase is suppressed.

Furthermore , since the water that has not been discharged from the drain hole is discharged to the outside through the additional drain hole, additional water that has entered can be discharged, and drainage is promoted. In addition, by using the silencer, it is possible to prevent or suppress the entry of water from the additional drain hole without providing a dedicated water intrusion prevention member. Furthermore, when it becomes difficult for air to pass through the inlet and the bent passage portion, an additional amount of air can be secured by taking outside air through the additional drain hole.

According to invention of Claim 2 , in addition to the effect of the invention of Claim 1 by the matter regarding the position of the drain hole , the following effect is produced. That is, since the introduction part that forms the inlet is attached to the duct body, the protrusion may be fitted into the through hole, so that the introduction part can be easily attached.

According to invention of Claim 3 , in addition to the effect of the invention of Claim 1 by the matter regarding the position of the drain hole , the following effect is produced. That is, since the outside air after the water is separated upon hitting the deflecting member flows toward the inlet, the water carried by the outside airflow is suppressed from entering the intake duct in the vehicle equipped with the intake duct.

According to invention of Claim 4 , in addition to the effect of the invention of the cited claim, there exists the following effect. That is, a part of the outside air toward the deflecting member flows through the deflecting member and flows toward the inlet, and accordingly, the amount of air flowing into the intake duct is increased and the air amount is easily secured.

According to the invention described in claim 5 , in addition to the effect of the invention described in the cited claim, the following effect is produced. That is, the water transported by the outside air toward the inlet portion closer to the bending direction hits the deflecting member and is separated from the outside air, and the outside air with a reduced amount of water flows toward the inlet. Intrusion into the duct is suppressed. Since a part of the external airflow goes to the inlet without being deflected by the deflecting member, it is easy to secure the amount of air flowing into the intake duct.

According to the invention described in claim 6 , in addition to the effect of the invention described in the cited claim, the following effect is exhibited. That is, the rigidity of the duct wall can be increased by utilizing the recess for avoiding interference between the duct wall of the intake duct and the cooling water passage forming member.

According to invention of Claim 7 , in addition to the effect of the invention of Claim 1 by the matter regarding the position of the drain hole , the following effect is produced. That is, since the water that has not been discharged from the drain hole is discharged to the outside through the additional drain hole, additional water that has entered can be discharged, and drainage is promoted. In addition, when the vehicle is accelerated, the backward inertial force acting on the intruded water further promotes the discharge of water from the additional drain hole.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Referring to FIGS. 1 and 2, an intake duct 4 to which the present invention is applied constitutes a part of an intake device 1 for an internal combustion engine mounted on a vehicle V, and at the front portion of the vehicle V together with an unillustrated engine body. The engine room 3 is formed so that the upper part is covered with the bonnet 2.

  The intake device 1 includes an intake duct 4 for taking in outside air as air in the engine room 3, a connection duct device 5 including a connection duct 5 a having a bellows structure connected to a downstream end of the intake duct 4, and a connection duct An air cleaner 6 to which the downstream end of the device 5 is connected, and a throttle body (not shown) communicating with the air cleaner 6 via a connection duct 7 connected to the outlet of the air cleaner 6 are provided. The connection duct device 5 is formed integrally with the engine cover 8 that covers the upper portion of the internal combustion engine, and communicates via a pipe 9 with a resonator that is a silencer that reduces intake noise.

  Referring to FIGS. 1 and 4, the air passage 10 formed by the intake duct 4 includes an inlet 10a through which outside air flows, an outlet 10d through which air toward the air cleaner 6 flows out, both of the inlet 10a and the outlet 10d. It has a bent passage portion 10b and a downstream passage portion 10c located therebetween. The bent passage portion 10b is located between the inlet 10a and the downstream passage portion 10c and bends the air flow from the inlet 10a toward the downstream passage portion 10c. The downstream passage portion 10c Lead to exit 10d.

  The intake duct 4 includes an introduction portion 11 that forms an inlet 10a, and a duct body 12 that includes a bent passage portion 10b, a downstream passage portion 10c, and a bent portion 12b that forms an outlet 10d, a downstream portion 12c, and a lead-out portion 12d, respectively. . A connection duct 5a is connected to the lead-out portion 12d.

  2 to 4, the intake duct 4 is disposed above the radiator 15 disposed behind the front grille 14 fixed to the front end portion of the bulkhead 13 constituting a part of the front portion of the vehicle body frame. Further, it is arranged on the right side of the vehicle body center line which is the center in the left-right direction (also in the vehicle width direction). Here, both the bulkhead 13 and the front grille 14 are vehicle body side members. In addition, front and rear, right and left in this specification correspond to front and rear and left and right of the vehicle V.

  The introduction part 11 disposed between the bonnet 2 and the bulkhead 13 has an opening edge 20 that forms the periphery of the inlet 10a that opens obliquely upward and forward. The opening edge 20 has a bottom portion 20a placed on the upper surface 13a of the front end portion of the bulkhead 13, and an arch shape in which the upper portion 20b1 is parallel to the bottom portion 20a. It has a flexible seal lip 20b (see also FIGS. 6 and 7), which is a U-shaped seal portion in plan view. Then, when the upper portion 20b1 of the seal lip 20b comes into contact with the inner surface of the bonnet 2, the flow of outside air toward the inlet 10a in the engine room 3 (hereinafter referred to as “outside airflow”) is caused between the bonnet 2 and the introduction portion 11. The space between the bonnet 2 and the introduction part 11 is sealed so that the rearward passage is suppressed.

  Outside air from the front of the vehicle V toward the front end of the vehicle body mainly passes through the outside air passage 16 formed in the engine room 3 and heads for the inlet 10a. The outside air passage 16 is formed with its upper part defined by the bonnet 2 and its lower part defined by the front grill 14 and the bulkhead 13, and the inlet 17 at the front end of the vehicle body, here the front end of the bonnet 2 and the engine room 3 has an inflow port 17 formed between the front grille 14 and the front grille 14. Therefore, outside air outside the vehicle flows into the engine room 3 from the inlet 17, passes through the outside air passage 16, and reaches the inlet 10 a positioned above the inlet 17.

  In the middle of the outside air passage 16 between the bonnet 2 and the front grille 14 in front of the inlet 10a and the bulkhead 13, the direction of the outside airflow toward the inlet 10a is diverted from the inlet 10a, here in one of the left and right directions. A deflecting member 18 directed to the right is provided on the lower surface of the bonnet 2. The plate-shaped deflecting member 18 that is longer in the left-right direction than in the up-down direction is fixed to the bonnet 2 by a clip 18c inserted through a through hole 18b provided in the mounting portion 18a, and the bonnet 2 is closed. It contacts the upper surface 14a of the front grill 14 over the entire length in the left-right direction.

  While the direction of the external airflow is easily changed by the deflecting member 18, the water such as water droplets passing through the external air passage 16 together with the external airflow has a higher density than the air. 18, adheres, then flows down the deflecting member 18 and falls outside the outside air passage 16. Therefore, since the water in the outside air is separated by the deflecting member 18 and the outside air whose water has decreased flows toward the inlet 10a, the deflecting member 18 prevents water from entering the intake duct 4. The

  In addition, since the inlet 10a is located higher than the inlet 17, the outside airflow from the inlet 17 is located in the middle of the outside air passage 16 in the vertical direction between the inlet 17 and the inlet 10a. And the front end of the bulkhead 13 are deflected before reaching the inlet 10a.

  Further, the deflecting member 18 is provided with a through passage 18d including a through hole that allows a part of the outside air hitting the deflecting member 18 to pass through. The through passage 18d is formed in an appropriate number and an appropriate shape as long as the function of suppressing the intrusion of water into the intake duct 4 by the deflecting member 18 is not impaired. Then, the amount of air flowing from the inlet 10a can be increased by the through passage 18d as compared to the case where there is no through passage 18d.

  Referring to FIGS. 4 and 5, the introduction portion 11 is constituted by a member made of an elastic material having rubber-like elasticity, and is a member separate from the duct body 12 made of synthetic resin. The introducing portion 11 has a cylindrical connecting portion 21 that is continuous with the opening edge 20 that forms an inlet 10a that is flat in the vertical direction. 8 and 9 together, the connecting portion 21 that forms the upstream opening 30 of the bent passage portion 10b and fits outside the connecting portion 31 that is a part of the bent portion 12b that is connected to the introducing portion 11. Includes a bottom wall 21a continuous with the bottom portion 20a, a top lip 21b and a pair of left and right side walls 21c and 21d connecting the bottom wall 21a and the top wall 21b. Have.

  The bottom wall 21a has a tip portion 21a1 that contacts the upper surface 13a (see FIGS. 2 and 3) of the bulkhead 13, and a back portion 21a2 that covers the outside of the lower wall 31a of the connection portion 31. The front end portion 21a1 is in contact with the bulkhead 13, and leakage of outside air between them is prevented or suppressed. In addition, the intake duct 4 is fixed to the bulkhead 13 with the introduction portion 11 being inserted into a plurality of insertion holes 21c formed in the distal end portion 21a1, and the duct body 12 is integrally formed with the duct body 12. In addition, it is fixed to the vehicle body by being fixed to the vehicle body frame via a plurality of brackets 12h.

  3, 6, and 7, protrusions 22 as a plurality of engaging portions are formed on the back portion 21 a 2, and a plurality of engaging portions are formed on the upper wall 21 b. Each of the projections 22 is formed. Each protrusion 22 having the same shape has a shaft portion 22a and a head portion 22b having a diameter larger than that of the shaft portion 22a. The shaft portion 22a is formed on the lower wall 31a and the upper wall 31b of the connection portion 31 to form the protrusion 22. The bottom wall 31a and the top wall 31b are sandwiched between the bottom wall 21a and the head portion 22a, and between the top wall 21b and the head portion 22a, respectively. The Furthermore, the left and right side walls 31c and 31d of the connecting portion 31 are respectively leftwardly connected to the through holes 23a formed by the long holes of the pair of engaging portions 23 formed in the left and right side walls 21c and 21d of the connecting portion 21. A pair of protrusions 33 are fitted as engaging portions that are formed to protrude to the right and align with the through holes 23a.

  The introduction portion 11 is locked and attached to the duct body 12 by the engagement of the protrusion 22 and the engagement portion 32, and further the engagement portion 23 and the protrusion 33. At this time, the connection part 21 fitted to the outside of the connection part 31 is slightly expanded compared to when it is in a natural state before being fitted so that the elastic force of the rubber-like elasticity acts on the connection part 31. It has a dimension that fits in the connecting portion 31 in a state where

  Further, the entrance 10a is partially formed by foreign matter between the through hole 23a and the protrusion 33 and between the side walls 31c and 31d of the connection portion 31 corresponding to the side walls 21c and 21d of the connection portion 21. When closed, a relatively small gap is formed to allow outside air flowing in through the through hole 23a to be supplied into the intake duct 4 through the space between the side wall 21c; 21d and the side wall 31c; 31d. You may do it.

  Referring to FIGS. 4, 5, and 8 to 10, the duct main body 12 has water that has entered the intake duct 4 in addition to the bent portion 12 b, the downstream portion 12 c, and the outlet portion 12 d to the outside of the intake duct 4. A drainage portion 12e for forming a drain hole 40 for discharging is provided. The bent portion 12b, the downstream portion 12c, the lead-out portion 12d, and the drainage portion 12e are constituted by a duct wall of the duct body 12.

  The bent portion 12b is bent in an L shape in the left-right direction, in this case, leftward toward the vehicle body center line in a substantially horizontal state with respect to the upstream portion that is the connecting portion 31 extending forward. The bent portion 12b is a duct wall that forms the bent passage portion 10b and faces the inlet 10a in the inflow direction A1 (see FIGS. 4 and 8) in plan view of air that is the main flow from the inlet 10a. An opposing wall 34 is provided. The facing wall 34 is concave on the side of the bent passage portion 10b when viewed in the bending direction A2 of the bent portion 12b with respect to the connection portion 31 (also the bending direction A2 of the air flow in the bent passage portion 10b, which is the left direction here). It is the curved wall (refer FIG. 5) which becomes a shape.

  Of the duct wall of the downstream portion 12c, an additional drain hole 41 is formed in the rear wall 35, which is a duct wall that extends in the bending direction A2 and is connected to the opposing wall 34 to form the downstream passage portion 10c. The additional drain hole 41, which is a circular hole having an opening area smaller than the drain hole 40, adheres to the inner surface of the rear wall 35 located upstream of the additional drain hole 41 among the water that has entered the air passage 10. In this state, water that is conveyed to the air from the bent passage portion 10b and flows through the downstream passage portion 10c toward the outlet 10d is discharged to the outside, and at a position that does not overlap the inlet 10a in the bending direction A2. It opens in the same direction as the inflow direction A1, here facing backwards.

  Referring to FIGS. 4, 5, and 9, below the additional drain hole 41, there is a side branch composed of a silencer having a silencer chamber for reducing intake noise, the pipe having a closed end. 50 protrudes rearward at a position overlapping the entire additional drain hole 41 in plan view. The front side surface 8a of the engine cover 8 (see FIG. 1) disposed behind the intake duct 4 is positioned close to the side branch 50 connected to the connection port 51 formed in the rear wall 35. The additional drain hole 41 faces the engine cover 8 (see FIG. 1) at a distance slightly larger than the protruding amount of the side branch 50 from the rear wall 35 to the rear.

The drainage part 12e is comprised by the cylindrical wall extended below from the bending part 12b, and the exit 40a of the drain hole 40 is formed by a lower end part. The drain hole 40 is provided at a position overlapping the bent passage portion 10b between the inlet 10a and the opposing wall 34 in plan view. Further, the drainage portion 12e has a rear wall 36 which is a wall located on the downward extension of the lower portion of the opposing wall 34 in the inflow direction A1, and the drain hole 40 and the outlet 40a are in plan view, in the inflow direction A1, it has a width W 0 maximum width W1 larger than (see FIG. 9) in the vertical direction of the upstream opening 30, has a maximum width W2 greater than the maximum width W1 in the bending direction A2. By maximum width W2 in the bending direction A2 of the drain hole 40 and the outlet 40a is larger than the maximum width W 1, at the bent passage portion 10b, water or dropped while being carried to the air flow toward the downstream portion 12c Water flowing down the facing wall 34 is easily discharged from the drain hole 40. Then, as shown in FIG. 4, the drain hole 40 and the outlet 40a are formed in the bending direction A2 in the half of the inlet 10a that is close to the direction opposite to the bending direction A2, in this embodiment, in the right half of the inlet 10a. And provided at a position overlapping the inlet 10a.

  Referring to FIG. 4, the deflecting member 18 for deflecting the outside air is provided only at a portion of the inlet 10a near the bending direction A2, in this embodiment only at the left half, and is provided at a position overlapping the inlet 10a in the bending direction A2. As a result, outside air that flows into the intake duct 4 from the portion near the downstream passage portion 10c at the inlet 10a flows in at a position close to the downstream passage portion 10c in the bent passage portion 10b, so that water enters the downstream passage portion 10c. There is a tendency that water entering the intake duct 4 is not easily discharged from the drain hole 40 because the water easily enters. However, the outside airflow toward the downstream passage portion 10c of the inlet 10a hits the deflecting member 18, and water is separated from the outside air, and the outside air with less water flows toward the inlet 10a. Is done.

  Further, as shown in FIGS. 9 and 10, the range from the central portion of the inlet 10a to the portion downstream of the additional drain hole 41 in the bending direction A2 is bent in the bending direction 12b and the downstream portion 12c. The passage portion 10b and the downstream passage portion 10c form a widened portion 12f that forms a widened widened passage portion extending downward, and the upper surface of the step portion 12g is formed by the step portion 12g that rises above the downstream end of the widened portion 12f. Further, the water adhering to the inner surfaces of the bent portion 12b and the downstream portion 12c below is prevented from moving toward the outlet 10d. Then, the water accumulated in the bottom portion 12f1 of the widened portion 12f is guided to the bottom portion 12f1 that gradually curves downward toward the drainage portion 12e and is discharged to the outside from the drain hole 40.

  Further, in the bent portion 12b, a cooling water outlet joint 60 extending from the radiator 15 (see FIG. 2) and the cooling water are connected to the duct wall 37 connected to the bottom wall 31a of the connecting portion 31 which is a downstream portion close to the introduction portion 11. An arch-shaped wall portion 38 that forms a recess for avoiding interference with the hose 61 is formed, and a part of the joint 60 and a part of the cooling water hose 61 are accommodated in the recess. Then, the rigidity of the connecting portion 31 in which the upstream opening 30 is formed is enhanced by the wall portion 38 having a convex shape on the bent passage portion 10b side. Here, the joint 60 and the cooling water hose 61 are both cooling water passage forming members extending from the radiator 15 (see FIG. 2). The joint 60 is formed integrally with the radiator 15 (see FIG. 2) or formed separately from the radiator 15 and connected to the radiator 15.

Next, operations and effects of the embodiment configured as described above will be described.
The intake duct 4 of the internal combustion engine that takes in air for combustion from the atmosphere forms a bent passage portion 10b and opposes the opposing wall 34 facing the inlet 10a in the inflow direction A1 and water that has entered the air passage 10 from the inlet 10a. A drainage portion 12e that forms a drainage hole 40 that opens downward to be discharged to the outside, and the drainage hole 40 is located between the inlet 10a and the opposing wall 34 and bent in plan view. Since the water that has entered the intake duct 4 together with the outside air from the inlet 10a has a higher density than the air by being provided at a position overlapping the passage portion 10b, the opposing wall 34 that forms the bent passage portion 10b due to its inertia It hits. The water after hitting the opposing wall 34 adheres to the opposing wall 34 and flows down the opposing wall 34 or falls away from the opposing wall 34 and bends between the inlet 10a and the opposing wall 34 in plan view. Since the water drainage hole 40 located at the position overlapping the passage portion 10b is quickly discharged to the outside of the intake duct 4, the drainage performance is improved, and the water that has entered the intake duct 4 is prevented from reaching the air cleaner 6. It is suppressed. In addition, since the opposing wall 34 is a duct wall of the intake duct 4, the bent passage portion 10b is not complicated, so that an increase in air ventilation resistance in the intake duct 4 can be suppressed.

  The range from the central portion of the inlet 10a to the portion downstream of the additional drain hole 41 in the bending direction A2 across the bent portion 12b and the downstream portion 12c is the widened portion 12f, and the downstream end of the widened portion 12f The step portion 12g suppresses the water adhering to the inner surface of the bent portion 12b and the downstream portion 12c below the upper surface of the step portion 12g toward the outlet 10d, and the water accumulated in the bottom portion 12f1 of the widened portion 12f is Since the water is guided to the bottom 12f1 and discharged from the drain hole 40 to the outside, the water that has entered the intake duct 4 is prevented or suppressed from reaching the air cleaner 6 also in this respect.

  An additional drain hole 41 is formed in the rear wall 35 forming the downstream passage portion 10c, and the additional drain hole 41 is in the inflow direction A1 at a position that does not overlap the inlet 10a in the bending direction A2 of the air flow in the bending passage portion 10b. The side branch 50, which opens in the same direction as the rear and reduces intake noise, protrudes rearward below the additional drain hole 41 at a position overlapping the entire additional drain hole 41 in plan view. Thus, the water that has passed through the bent passage portion 10b without being discharged from the drain hole 40 flows along with the air in the downstream portion 12c while adhering to the rear wall 35 that continues to the opposing wall 34, and the additional drain hole 41 Since the water is discharged from the outside, it is possible to discharge the invading water and promote drainage. In addition, by using the side branch 50 provided directly below the additional drain hole 41, water from below passes through the additional drain hole 41 in the intake duct 4 without providing a dedicated water intrusion prevention member. It is prevented or suppressed from entering. Furthermore, when the inlet 10a or the bent passage portion 10b is partially blocked by water, foreign matter, or the like and the air becomes difficult to pass through, the outside air can be taken into the intake duct 4 through the additional drain hole 41. As a result, an additional amount of air can be secured.

  The additional water drain hole 41 formed in the rear wall 36 is opened rearward at a position where it does not overlap the inlet 10a in the bending direction A2 of the air flow in the bent passage portion 10b, thereby adding intruding water. Further, drainage from the intake duct 4 is facilitated, and when the vehicle V accelerates, additional water is drained by a backward inertial force acting on the water that has entered the downstream passage portion 10c. The discharge of water from the hole 41 is further promoted. Furthermore, since the additional water drain hole 41 is opened facing rearward, it is difficult for water from the front to enter, and the water intrusion is further suppressed by facing the engine cover 8.

  The intake duct 4 includes an introduction portion 11 made of an elastic material having rubber-like elasticity that forms the inlet 10a, and a duct body 12 in which a bent passage portion 10b, a downstream passage portion 10c, and an outlet 10d are formed. The projection formed on the fitting portion 11 is fitted into the through-hole of the introduction portion 11 so that the introduction portion 11 is attached to the duct main body 12. Therefore, in order to attach the introduction portion 11 to the duct main body 12, Since the protrusion only needs to be fitted into the through hole of the introduction portion 11 having rubber-like elasticity, the introduction portion 11 can be easily attached.

  In the vehicle V in which the intake duct 4 of the internal combustion engine is mounted, a deflecting member 18 that deflects a part of the flow of the outside air toward the inlet 10a from the direction toward the inlet 10a is provided, so that the outside airflow toward the inlet 10a is changed. The water conveyed to the external airflow when hitting the deflecting member 18 is separated from the outside air by the inertia due to the inertia, and the outside air with less water flows toward the inlet 10a, so the intake duct 4 is mounted. In the vehicle V, the water conveyed to the external airflow is prevented from entering the intake duct 4.

  The deflecting member 18 is provided with a through-passage 18 d that allows outside air to flow through the deflecting member 18, so that part of the external airflow toward the deflecting member 18 is not deflected by the deflecting member 18. Since the air passes through the through-passage 18d, passes through the deflecting member 18 and travels toward the inlet 10a, the amount of air flowing into the intake duct 4 is increased correspondingly, and the air amount can be easily secured.

  The deflection member 18 is provided only at a portion of the inlet 10a near the bending direction A2 of the air flow in the bent passage portion 10b, and is provided at a position overlapping the inlet 10a in the bending direction A2, so that the inlet 10a is closer to the bending direction A2. The water entering from this portion tends to flow downstream from the opposing wall 34 and is difficult to discharge, but the water conveyed by the outside air toward the inlet portion near the bending direction A2 is deflected by its inertia. Since the outside air that has been separated from the outside air upon hitting 18 and has reduced water flows toward the inlet 10a, the water conveyed to the outside air stream is prevented from entering the intake duct 4, and the deflection member 18 Since it overlaps with only a part of 10a, a part of the external airflow goes to the inlet 10a without being deflected by the deflecting member 18, so that it becomes easy to secure the amount of air flowing into the intake duct 4.

  When the upper part 20b1 of the seal lip 20b of the introduction part 11 contacts the inner surface of the bonnet 2, the external airflow toward the inlet 10a in the engine room 3 passes between the bonnet 2 and the introduction part 11 and escapes backward. Since the gap between the bonnet 2 and the introduction part 11 is sealed so that the air is taken in, the efficiency of taking in the outside air from the inlet 10a is improved, and the amount of air flowing into the intake duct 4 is increased. In addition, the hot air in the engine room 3 is suppressed from flowing into the intake duct 4. Since the leading end portion of the introducing portion 11 is in contact with the bulkhead 13 and leakage of outside air between the two is prevented or suppressed, the outside air intake efficiency from the inlet 10a is also improved in this respect.

  In the middle of the outside air passage 16, the outside air current is deflected by the front grill 14 and the bulkhead 13 positioned between the inlet 17 and the inlet 10a in the vertical direction, and then reaches the inlet 10a. Similarly to the deflecting member 18, the head 13 also prevents the water conveyed to the external airflow from being separated from the external air and the water from entering the intake duct 4.

  In the bent portion 12b, the duct wall 37 adjacent to the inlet 10a and the introduction portion 11 and connected to the flat bottom wall 31a of the connection portion 31 avoids interference with the joint 60 and the cooling water hose 61. By forming the arch-shaped wall portion 38 that forms the concave portion for forming the wall portion 38 that is a locally bent portion in the duct wall 37, the duct wall 37 and the joint 60 or the cooling water hose 61 are formed. The rigidity of the duct wall 37 connected to the connection portion 31 which is a relatively low rigidity portion of the duct wall of the intake duct 4 because it is close to the inlet 10a is increased using the recess for avoiding interference with the duct. . In addition, by increasing the rigidity of the duct wall 37, the introduction part 11 made of an elastic material fitted to the connection part 31 in which the upstream opening 30 is formed is held in the connection part 31 in a stable fitting state. . Furthermore, since a part of the joint 60 and a part of the cooling water hose 61 are accommodated in the recess formed by the wall part 38, the intake duct 4 and the radiator 15 are arranged close to each other in the front-rear direction and the vertical direction. Therefore, a compact arrangement of the intake duct 4 and the radiator 15 is possible.

Hereinafter, an embodiment in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
The deflecting member 18 may be provided in the middle of the outside air passage 16, and may be provided in the front grill 14 or the bulkhead 13. The air passage 10 may be composed of a single through hole as long as the passage of water can be suppressed as much as possible. The entrance 10a does not have to face forward. The deflecting member 18 may not have the through passage 18d.
The introduction part 11 is a separate member from the duct main body 12, but the introduction part and the duct main body may be composed of one member.

1 is a perspective view of an intake device for an internal combustion engine including an intake duct according to an embodiment of the present invention. FIG. 2 is a schematic right side view of a vehicle body on which the intake duct of FIG. 1 is mounted. FIG. 3 is a perspective view from the front of the vehicle of FIG. 2. It is a top view of the air intake duct of FIG. It is a right view of the air intake duct of FIG. FIG. 6 is a view taken along the arrow VI of the intake duct of FIG. 5. It is sectional drawing in the VII-VII arrow of FIG. It is a top view of the duct main body of the air intake duct of FIG. It is a front view of the duct main body of FIG. It is sectional drawing in the XX arrow of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Intake device, 2 ... Bonnet, 3 ... Engine room, 4 ... Intake duct, 5 ... Connection duct apparatus, 6 ... Air cleaner, 7 ... Connection duct, 8 ... Engine cover, 9 ... Pipe, 10 ... Air passage, 10a ... Inlet, 10b ... Bent passage, 10c ... Downstream passage, 10d ... Outlet, 11 ... Inlet, 12 ... Duct body, 12e ... Drain, 13 ... Bulkhead, 14 ... Front grille, 15 ... Radiator, 16 ... Outside air Passage, 17 ... inlet, 18 ... deflecting member, 19 ..., 20 ... opening edge, 21 ... connecting portion, 22 ... projection, 23 ... engaging portion, 23a ... through hole, 30 ... upstream opening, 31 ... connecting portion, 32 ... engaging portion, 33 ... projection, 34 ... opposing wall, 35, 36 ... rear wall, 37 ... duct wall, 38 ... wall portion, 40 ... drain hole, 41 ... additional drain hole, 50 ... side branch, 51 ... Connection port, 60 ... Joint, 61 ... Cooling water hose,
V ... vehicle, A1 ... inflow direction, A2 ... bending direction, W1, W2 ... width.

Claims (7)

Air having an inlet through which outside air flows, an outlet through which air toward the air cleaner flows out, and a bent passage portion that is located between the inlet and the outlet and that has a bent air flow from the inlet toward the outlet. In an intake duct of an internal combustion engine that forms a passage,
The intake duct is a duct wall that forms the bent passage portion, and is an opposing wall that faces the inlet in the air inflow direction from the inlet in plan view, and water that has entered the air passage from the inlet. A drainage portion that forms a drainage hole that opens downward to discharge to the outside, and
The drain hole is provided between the inlet and the opposing wall in a plan view and at a position overlapping the bent passage portion,
In the air passage, an additional water drain hole is formed in a duct wall that forms a downstream passage portion located between the bent passage portion and the outlet, and the additional water drain hole is used for air flow in the bent passage portion. A silencer having a silencer chamber that opens in the same direction as the inflow direction at a position that does not overlap with the inlet in the bending direction and has a silencer chamber that reduces intake noise is located in a plan view below the additional drain hole. intake duct of the internal combustion engine at a position that overlaps with the entire vent hole you characterized in that protrudes in the same direction as the inflow direction. Air having an inlet through which outside air flows, an outlet through which air toward the air cleaner flows out, and a bent passage portion that is located between the inlet and the outlet and that has a bent air flow from the inlet toward the outlet. In an intake duct of an internal combustion engine that forms a passage,
The intake duct is a duct wall that forms the bent passage portion, and is an opposing wall that faces the inlet in the air inflow direction from the inlet in plan view, and water that has entered the air passage from the inlet. A drainage portion that forms a drainage hole that opens downward to discharge to the outside, and
The drain hole is provided between the inlet and the opposing wall in a plan view and at a position overlapping the bent passage portion,
The intake duct includes an introduction portion made of an elastic material having rubber-like elasticity that forms the inlet, and a duct body in which a bent passage portion is formed, and a protrusion formed on the duct body is formed in the introduction portion. It has been by fitting the through hole, an intake duct of an internal combustion engine you wherein introducing portion is mounted on the duct body. Air having an inlet through which outside air flows, an outlet through which air toward the air cleaner flows out, and a bent passage portion that is located between the inlet and the outlet and that has a bent air flow from the inlet toward the outlet. In a vehicle equipped with an intake duct of an internal combustion engine that forms a passage ,
The intake duct is a duct wall that forms the bent passage portion, and is an opposing wall that faces the inlet in the air inflow direction from the inlet in plan view, and water that has entered the air passage from the inlet. A drainage portion that forms a drainage hole that opens downward to be discharged to the outside, and
The drain hole is provided between the inlet and the opposing wall in a plan view and at a position overlapping the bent passage portion,
A vehicle having a deflecting member for deflecting a part of a flow of outside air toward the entrance from a direction toward the entrance. 4. The vehicle according to claim 3, wherein the deflecting member is provided with a through passage that allows outside air to flow through the deflecting member. The deflection member, of the inlet, only part of the bending direction side of the air flow at the bent passage portions, according to claim 3 or claim 4, characterized in that provided in a position overlapping with the inlet in the bending direction The vehicle described. Wherein the duct wall of the air intake duct, of claims 3 to 5, characterized in that the recess for avoiding interference with the coolant passage formation member extending from the radiator mounted on the vehicle is formed The vehicle according to any one of the above. Air having an inlet through which outside air flows, an outlet through which air toward the air cleaner flows out, and a bent passage portion that is located between the inlet and the outlet and that has a bent air flow from the inlet toward the outlet. In a vehicle equipped with an intake duct of an internal combustion engine that forms a passage ,
The intake duct is a duct wall that forms the bent passage portion, and is an opposing wall that faces the inlet in the air inflow direction from the inlet in plan view, and water that has entered the air passage from the inlet. A drainage portion that forms a drainage hole that opens downward to discharge to the outside, and
The drain hole is provided between the inlet and the opposing wall in a plan view and at a position overlapping the bent passage portion,
In the air passage, an additional drain hole is formed in a rear wall that forms a downstream passage portion located between the bent passage portion and the outlet, and the additional drain hole is used for air flow in the bent passage portion. A vehicle characterized by opening rearward at a position that does not overlap the entrance in a bending direction.

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