WO2017183268A1

WO2017183268A1 - Air intake duct

Info

Publication number: WO2017183268A1
Application number: PCT/JP2017/005405
Authority: WO
Inventors: 木村　昌裕; 高広松橋
Original assignee: 日野自動車株式会社
Priority date: 2016-04-19
Filing date: 2017-02-15
Publication date: 2017-10-26
Also published as: CN109072829A

Abstract

Provided is an air intake duct 6 for taking in, as intake air for an engine, outside air from an air intake port 2 that opens to the outer side in the vehicle width direction of a head section 4a mounted on the top surface of a cab of a vehicle, the air intake duct being configured such that: the air intake port 2 opens so as to avoid the area immediately above a duct section 4b that extends downward from the bottom surface of a rear section of the head section 4a along the rear surface of the cab; a level difference is formed at the rear end of the air intake port 2 toward the inner side in the vehicle width direction; and a guide section 7 is formed so as to make the level difference continuous though a concavely curved surface that forms a circular arc when seen in a plan view.

Description

Air intake duct

The present invention relates to an intake duct.

In general, large transport vehicles such as trucks have more opportunities to travel on unpaved rough roads than ordinary passenger cars, so the engine intake air is not the outside air near the ground that contains a lot of dust. Therefore, it is preferable to take in clean outside air at a sufficiently high part from the ground, and there is a risk of rainwater and snow splashing up near the ground, so make sure that only outside air is at a sufficiently high part from the ground. It is preferable to incorporate.

For this reason, in a large transport vehicle, an intake duct extending in the vertical direction is installed on the rear surface of the cab. However, in recent years, as shown in FIG. An air intake duct 3 having an air intake port 2 opened on the upper surface of the air intake 1 has been proposed. In the case of the example shown here, a duct body 4 installed on the rear surface of the cab 1 to form an outer shell structure, and the air The intake duct 3 is configured to include a louver 5 that covers the intake port 2 and prevents direct rainwater entry (snow penetration is similarly prevented).

According to such an intake duct 3, the intake efficiency of the intake air into each cylinder of the engine is increased by taking in the sufficiently cooled outside air that is less affected by the hot air from the engine room, and moreover clean air is supplied at a higher position. By taking it in, the service life of the air cleaner can be extended, and the operation state with little pressure loss can be maintained for a long period of time, thereby improving the fuel efficiency.

Incidentally, as prior art document information explaining general existing technologies related to the present invention, the following patent documents 1 to 4 and the like by the same applicant as the present invention already exist.

Utility Model Registration No. 2566732 JP 2002-310022 A Japanese Patent No. 5485585 Japanese Patent No. 5697941

However, in the intake duct 3 that opens the air intake 2 on the upper surface of the cab 1, the head that rides on the upper surface from the rear surface side of the cab 1 and opens the air intake 2 outward in the vehicle width direction (left side in FIG. 1). The duct body 4 is configured to include a portion 4a and a duct portion 4b extending downward from the rear lower surface of the head portion 4a and extending along the rear surface of the cab 1. There is a concern that the outside air that tends to flow into the duct portion 4b is biased toward the rear side of the air intake port 2, and the flow velocity is increased here, making it easy to suck rain and snow.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake duct that can prevent rain and snow from entering the duct.

The present invention is an intake duct that takes in outside air as intake air for an engine from an air intake opening that is open to the vehicle width direction outside of a head portion that rides on an upper surface of a cab of a vehicle, and includes a rear surface of the cab from a rear lower surface of the head portion The air intake opening is opened, avoiding directly above the duct portion extending downward along the air passage, and a step is formed at the rear end of the air intake opening in the vehicle width direction, and an arc shape is formed between the steps in a plan view. It is characterized in that a guide portion that is continuous by a curved surface is formed.

Thus, in this way, since the air intake port is opened so as not to be directly above the duct portion, the outside air flows from the front side of the head portion and flows toward the duct portion. Rain and snow collide with the wall surface and fall to the bottom surface to deviate from the flow of outside air and prevent entry into the duct part, and direct rain and snow entry from the air intake to the duct part Will be blocked.

Moreover, since the flow of outside air passing through the rear end of the air intake is directed along the guide portion and directed toward the front of the vehicle, the flow of outside air on the rear side of the air intake that tends to increase the flow velocity temporarily flows from the duct portion. A large turn is made to move away, and the amount of rain and snow falls larger than before in the time earned by this turn, making it difficult for the rain and snow to be taken into the air intake.

It should be noted that rain and snow melting water remaining in the head part after being prevented from entering the duct part is discharged outside the head part by inclining the bottom surface of the head part or providing a drainage port. You should be able to do it.

Further, in the present invention, it is preferable to provide a dredging wall for blocking water accumulated on the bottom surface of the head portion at a position adjacent to the guide portion in the head portion. As long as the rain and snow fall below the height of the dredged wall while being guided by the guide part and the outside air makes a big turn, the dam is prevented from entering the duct part. Intrusion will be blocked.

Furthermore, it is preferable to divide the head part back and forth with the rear end of the air intake as a boundary, and to form a wall on the lower side of the open end surface in the rear part of the divided head part. When blow molding the duct part including the rear part of the head part, it is possible to easily integrally mold the wall, and even if the wall is attached as a separate part by post-processing, the front part of the head part is assembled. In the previous stage, it is possible to easily attach the wall.

In addition, if the head part is divided into front and rear parts, the front part of the head part integrated with the partition plate by wrapping and solidifying the partition plate for smoothly circulating outside air as an insert product with molten resin. It becomes possible to form easily, and it is also possible to efficiently secure a large cross-sectional area of the flow path as compared with the case where a separate partition plate is assembled by post-processing.

Further, in the present invention, it is preferable to attach a louver that covers the side of the head portion on the outer side in the vehicle width direction and extends directly above the duct portion beyond the opening range of the air intake port. It is possible to maintain a good-looking appearance in terms of design, while opening the air intake opening avoiding the above.

Further, in the present invention, it is preferable to form a drainage passage around the air intake port on the upper surface of the head portion, which receives rainwater flowing down the upper surface of the head portion and flows down to the side of the air intake port. By doing so, rainwater that flows down and flows onto the upper surface of the head portion is received by the drainage passage and is washed off to the side of the air intake, so that water drops at the upper edge of the air intake are sucked into the intake duct. This prevents the phenomenon of being lost.

Further, it is preferable to form the drainage passage by a groove shape recessed in the upper surface of the head portion, and in this way, it becomes possible to easily form the drainage passage by a mold at the time of blow molding of the intake duct. At the same time, it is possible to prevent the appearance from deteriorating as a drainage passage that is not noticeable and has no protruding portion.

According to the intake duct of the present invention described above, various excellent effects as described below can be obtained.

(I) The outside air is circulated from the front side of the head portion to be a flow toward the duct portion, and rain and snow can be deviated from the outside air flow during the wraparound to prevent entry into the duct portion, Air that can prevent direct intrusion of rain or snow from the air intake into the duct, and also has a guide that directs the flow of outside air that passes through the rear end of the air intake to the front of the vehicle, making it easy to increase the flow velocity. Since the flow of outside air behind the intake port is turned around so as to be once away from the duct part, the amount of rain and snow falling can be increased more than before, making it difficult for the rain and snow to be taken into the air intake, Rain and snow can be reliably prevented from entering the duct.

(II) If a construction is provided with a dredging wall that dams up the water accumulated on the bottom surface of the head part at a position adjacent to the guide part in the head part, the rain and snow melting water staying in the head part is directed to the duct part side. It can be reliably dammed by the dredging wall so that it does not get in, and while it is guided by the guide part and the outside air turns around, the rain and snow can be dropped below the height of the dredging wall to ensure entry into the duct part. Can be blocked.

(III) If the head part is divided into the front and rear parts with the rear end of the air intake as a boundary, and a saddle wall is formed below the open end surface in the rear part of the divided head part, the rear of the head part The wall can be easily formed integrally when blow molding the duct part including the part, and even when the wall is attached as a separate part by post-processing, the wall can be easily attached before assembling the front part of the head part. It can be performed.

(IV) If a louver is provided on the outer side surface of the head portion in the vehicle width direction so as to cover the air intake opening and directly above the duct, the air intake opening is opened to avoid the duct. However, it is possible to maintain a good-looking appearance in terms of design.

(V) If the drainage passage is formed around the air intake port on the upper surface of the head portion, the drainage passage that receives rainwater flowing down the upper surface of the head portion and drains it to the side of the air intake port is formed. Since rainwater that falls upon and flows into the water can be received by the drainage passage and can be washed off to the side of the air intake, the phenomenon of rainwater inhalation from the air intake can be reliably prevented.

(VI) If the drainage passage is formed by the groove shape recessed on the upper surface of the head portion, the drainage passage can be easily formed by a mold at the time of blow molding of the intake duct. It is also possible to prevent the appearance from deteriorating as an inconspicuous drainage passage without a protruding portion.

It is a perspective view which shows a prior art example. It is a perspective view shown in the state which decomposed | disassembled an example of the form which implements this invention. It is sectional drawing which looked at the guide part of FIG. 2 by planar view. It is a perspective view which shows another Example of this invention. It is the front view which looked at the air intake duct of FIG. 4 from the vehicle front. It is the perspective view which looked at the intake duct of FIG. 4 from the vehicle diagonally back.

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

2 and 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIG. 1 represent the same items.

As shown in FIG. 2, the intake duct 6 in the present embodiment is installed on the rear surface of the cab 1 to form an outer shell structure, as in the case of the conventional intake duct 3 described above with reference to FIG. And a louver 5 that covers the air intake 2 and prevents direct rainwater descent (similarly preventing snow intrusion in the same manner). The duct includes a head portion 4a that opens the entrance 2 to the outside in the vehicle width direction (left side in FIG. 1), and a duct portion 4b that extends downward from the lower surface of the rear portion of the head portion 4a and extends along the rear surface of the cab 1. Although the main body 4 is configured, the air intake port 2 of the head portion 4a is opened to avoid the position directly above the duct portion 4b, and a step is formed at the rear end of the air intake port 2 in the vehicle width direction. And an arc between the steps in plan view When forming the guide portion 7 is continuous (see FIG. 3) by a concave curved surface constituting a is a feature.

In addition, in the case of the example shown here, the head is placed on the rear portion 4ar that is directly above the duct portion 4b in the head portion 4a and the front portion 4af that extends forward and rides on the upper surface of the cab 1. The portion 4a is divided, and the side surface 8 is left outside the rear portion 4ar in the vehicle width direction, while the outer side in the vehicle width direction of the front portion 4af is opened to form the air intake port 2.

That is, the head portion 4a in this embodiment has a structure that is divided forward and backward with the rear end of the air intake port 2 as a boundary, and the lower side of the open end surface 9 in the rear portion 4ar of the divided head portion 4a. Further, a ridge wall 10 extending in the vehicle width direction is formed adjacent to the guide portion 7 so that water accumulated on the bottom surface 11 of the head portion 4a can be dammed by the ridge wall 10.

Here, when forming the eaves wall 10 below the open end surface 9 of the rear part 4ar, the eaves wall 10 may be integrally formed during blow molding of the duct part 4b including the rear part 4ar of the head part 4a. Although it is good, before attaching the front part 4af of the head part 4a, it is also possible to attach the collar wall 10 as a separate part by post-processing.

In addition, the bottom surface 11 of the head portion 4a is inclined so that the water accumulated on the bottom surface 11 flows back to the air intake 2 side, and the water is supplied by a drip channel 12 provided at the lower end of the air intake 2. It collect | recovers and guides to the eaves wall 10 side so that it can discharge | emit out of the head part 4a from the drain port 13.

In forming the drain port 13 for discharging water, a recess is formed at the lowest position of the fitting portion with the rear portion 4ar in the front portion 4af of the head portion 4a, and the front portion 4af is What is necessary is just to make it form a clearance gap between the said recessed part 10 and the said wall 10 when it fits to the back part 4ar, and to utilize this clearance gap as the drain outlet 13. FIG.

Furthermore, in this embodiment, the outside air taken inward in the vehicle width direction from the air intake port 2 flows into the rear of the vehicle in the head portion 4a, so that the head can be guided smoothly. The partition plate 14 is built in the portion 4a. When the partition plate 14 is built in, the partition plate 14 is wrapped in molten resin as an insert and solidified, thereby integrating the partition plate 14. It can be formed as a front portion 4af of the head portion 4a. Further, a louver 5 is mounted on the side surface of the head portion 4a on the outer side in the vehicle width direction so as to cover the air intake 2 beyond the opening range of the head portion 4a and directly above the duct portion 4b.

Thus, if the intake duct 6 is configured in this way, the air intake port 2 is opened so as to avoid a position directly above the duct portion 4b, so that outside air circulates from the front side of the head portion 4a and enters the duct portion 4b. During the wraparound, rain or snow collides with the wall surface or falls to the bottom surface 11 to deviate from the flow of the outside air and prevent entry into the duct portion 4b. The direct entry of rain and snow into the portion 4b is also prevented.

Moreover, since the flow of outside air passing through the rear end of the air intake 2 is guided along the guide portion 7 and directed toward the front of the vehicle (on the right side in FIG. 3), the rear of the air intake 2 where the flow velocity tends to increase. The flow of outside air on the side turns away from the duct part 4b once, and the amount of rain and snow falling is larger than before in the time earned by this turning, and the rain and snow are taken into the air intake 2 It becomes difficult.

Further, the rain or snow melting water remaining in the head portion 4a after being prevented from entering the duct portion 4b is reliably dammed by the dredging wall 10 so as not to enter the duct portion 4b side, and the head portion 4a It flows down to the drip channel 12 due to the inclination attached to the bottom surface 11 and is collected, guided to the wall 10 side by the drip channel 12 and discharged from the drain port 13 to the outside of the head portion 4a.

Therefore, according to the above embodiment, the outside air is circulated from the front side of the head portion 4a to flow toward the duct portion 4b, and rain and snow are deviated from the flow of the outside air during the wraparound to the duct portion 4b. In addition to preventing intrusion, it is also possible to prevent direct intrusion of rain and snow from the air intake 2 into the duct portion 4b, and guide the flow of outside air that passes through the rear end of the air intake 2. The flow of outside air behind the air intake 2 where the flow velocity tends to be increased by the portion 7 is increased so as to be once away from the duct portion 4b, thereby increasing the amount of rain and snow falling from the conventional level. Since it is possible to make it difficult for snow to be taken into the air intake 2, it is possible to reliably prevent rain and snow from entering the duct portion 4b.

In addition, rain and snow melting water remaining in the head portion 4a can be reliably dammed by the wall 10 so as not to enter the duct portion 4b side, and the outside air is greatly guided by being guided by the guide portion 7. Intrusion into the duct part 4b can be reliably prevented by simply dropping rain or snow below the height of the wall 10 in between.

Further, particularly in the present embodiment, the head portion 4a is divided into front and rear portions with the rear end of the air intake port 2 as a boundary, and the eaves wall 10 is provided below the open end surface of the rear portion 4ar of the divided head portion 4a. Since the ridge wall 10 can be easily formed integrally when blow-molding the duct portion 4b including the rear portion 4ar of the head portion 4a, and the ridge wall 10 is attached as a separate part by post-processing. Even if it exists, if it is a stage before the front part 4af of the head part 4a is assembled | attached, the wall 10 can be attached easily.

Moreover, if the head part 4a is divided into front and rear parts, the head part 4a in which the partition plate 14 is integrated by wrapping and solidifying the partition plate 14 for smoothly circulating outside air as an insert product with molten resin. The front portion 4af can be easily formed, and the flow passage cross-sectional area can be secured efficiently and larger than the case where the separate partition plate 14 is assembled by post-processing.

Moreover, since the louver 5 covers the side surface of the head portion 4a on the outer side in the vehicle width direction beyond the opening range of the air intake port 2 and directly above the duct portion 4b, the air intake port avoids the position directly above the duct portion 4b. While opening 2, it is possible to maintain a good-looking appearance in terms of design.

FIGS. 4 to 6 show another embodiment of the present invention. In the intake duct 6 configured in the same manner as in the case of FIGS. 2 and 3, the periphery of the air inlet 2 on the upper surface of the head portion 4a is shown. Further, as shown by an arrow A (see FIGS. 5 and 6), a drainage passage 15 is formed for receiving rainwater flowing down in the vehicle width direction and flowing down to the side of the air intake 2 as indicated by an arrow A (see FIGS. 5 and 6). Yes.

The drainage passage 15 is formed by a groove shape recessed in the upper surface of the head portion 4a. More specifically, the air intake port 2 is provided at the outer end in the vehicle width direction on the upper surface of the head portion 4a. A drainage passage 15 is formed by forming a groove shape extending in the vehicle front-rear direction along the upper edge portion of the vehicle. Generally, the duct body 4 of this type of intake duct 6 is manufactured by blow molding. What is necessary is just to shape | mold the said drainage channel 15 integrally with a metal mold | die at the time of blow molding.

The upper surface of the head portion 4a referred to in the present invention refers to a range that can be seen when the head portion 4a is viewed from above, and particularly in this embodiment, the front and back positions of the upper surface of the head portion 4a. The drainage passage 15 also extends in the inclined portion, and both sides of the air intake 2 extend obliquely downward to reach the vicinity of the lower end position of the air intake 2.

Thus, if the intake duct 6 is configured in this way, even if the upper surface of the head portion 4a is inclined downwardly in the vehicle width direction, it is poured onto the upper surface of the head portion 4a and the vehicle width direction. Rainwater that flows outward is received by the drainage passage 15 and is washed away to the side of the air intake 2, thereby preventing a phenomenon that water drops are sucked into the intake duct 6 at the upper edge of the air intake 2. Will be.

As a result, the upper surface of the head portion 4a can be provided with a slope that forms a downward gradient outward in the vehicle width direction without any trouble, so that the head portion 4a of the intake duct 6 that rides on the upper surface of the cab 1 is not conspicuous. The appearance of the cab 1 can be prevented from being impaired by the presence of the head portion 4a.

Therefore, according to the above-described embodiment, rainwater that falls on the upper surface of the head portion 4a and flows outward in the vehicle width direction can be received by the drainage passage 15 and can be washed down to the side of the air intake 2. In this way, it is possible to reliably prevent the phenomenon that rainwater drops are sucked from the top of the head 4a, and to add a slope that forms a downward slope outward in the vehicle width direction on the upper surface of the head portion 4a. A good appearance of the cab 1 can be maintained.

Further, in the present embodiment, the drainage passage 15 is formed by the groove shape recessed in the upper surface of the head portion 4a. Therefore, the drainage passage 15 can be easily formed by a mold when the intake duct 6 is blow-molded. Moreover, it is possible to prevent the appearance of the drainage passage 15 that does not have a protruding portion from the appearance and is less noticeable.

Note that the intake duct of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Cab 2 Air inlet 4a Head part 4ar Back part 4b Duct part 5 Louver 6 Intake duct 7 Guide part 9 Open end face 10 Gutter wall 11 Bottom face 15 Drainage channel

Claims

An air intake duct that takes in outside air as engine intake air from an air intake opening that opens outward in the vehicle width direction of the head portion that rides on the upper surface of the cab of the vehicle, and is downward from the rear lower surface of the head portion along the rear surface of the cab Opening the air intake opening, avoiding directly above the extending duct portion, and forming a step inward in the vehicle width direction at the rear end of the air intake opening, and continuing between the steps by a concave curved surface forming an arc shape in plan view Air intake duct that forms a guide section.
The air intake duct according to claim 1, further comprising a wall that dams up water accumulated on a bottom surface of the head portion at a position adjacent to the guide portion in the head portion.
The intake duct according to claim 2, wherein the head portion is divided into front and rear portions with the rear end of the air intake as a boundary, and a saddle wall is formed below the open end surface in the rear portion of the divided head portion.
The air intake duct according to claim 1, wherein a louver that covers the side of the head portion on the outer side in the vehicle width direction and covers the duct portion directly above the opening range of the air intake port is mounted.
The intake duct according to claim 1, wherein a drainage passage is formed around the air intake on the upper surface of the head portion to receive rainwater flowing down the upper surface of the head portion and flow down to the side of the air intake.
The intake duct according to claim 5, wherein a drainage passage is formed by a groove shape recessed in the upper surface of the head portion.