JP6689528B2 - Intake duct - Google Patents

Description

  The present invention relates to an intake duct.

  Generally, large transport vehicles such as trucks have more opportunities to drive on unpaved rough roads than ordinary passenger cars, so the intake air of the engine is not outside air near the ground, which contains a lot of dust. , It is preferable to take in clean outside air that is sufficiently high above the ground, and since there is a risk that rainwater and snow splashes will also be taken in near the ground, make sure that only outside air is sufficiently high above the ground. It is preferable to incorporate it.

  Therefore, in a large-sized transport vehicle, an intake duct that extends long vertically is installed on the rear surface of the cab. However, as shown in FIG. 2, in recent years, the cab 1 is designed to be able to take in cleaner air. There is proposed an intake duct 3 having an air intake 2 opened on the upper surface of the.

  According to the intake duct 3, the intake air to each cylinder of the engine is improved by taking in sufficiently cold outside air that is less affected by the hot air from the engine room, and moreover, the outside air is clean at a higher position. By incorporating the air cleaner, the life of the air cleaner can be extended, and the operating condition with less pressure loss can be maintained for a long time to improve the fuel efficiency.

  Here, the duct body 4 forming the outer shell structure of the intake duct 3 runs from the rear surface side of the cab 1 to the upper surface and opens the air intake port 2 to the vehicle width direction outer side (left side in FIG. 2). The head portion 4a and the duct portion 4b extending downward from the lower surface of the rear portion of the head portion 4a and extending along the rear surface of the cab 1 are taken in from the air intake port 2 toward the inner side in the vehicle width direction. Since the outside air flows so as to wrap around the vehicle rearward in the head portion 4a, a partition plate 5 for smoothly guiding the wraparound of the outside air flows to the head portion 4a as shown in an exploded view in FIG. It is built in.

  Conventionally, a partition plate 5 of this type is constructed by inserting separate pieces 5a and 5b, which are separate parts, from the air inlet 2 after the blow molding of the head portion 4a, and the air inlet 2 is assembled after the assembly. It is covered with a louver 6 so as to prevent the direct entry of rainwater (the invasion of snow is also blocked).

  In this case, the flow of the outside air taken in from the air intake port 2 toward the inside in the vehicle width direction is not only guided by the partition plate 5 so as to smoothly wrap around to the rear of the vehicle, but also rain during the wraparound. When snow or snow collides with the wall surface of the partition plate 5 or falls on the bottom surface, it deviates from the flow of the outside air and is prevented from entering the duct portion 4b.

  Here, the divided piece 5a of the partition plate 5 is provided with a slope for returning the water accumulated on the bottom surface thereof toward the air intake 2 side, and from a drain port (not shown) provided near the lower end of the air intake 2. It can be discharged to the outside of the head portion 4a.

  Incidentally, as the prior art document information explaining the general existing technique related to the present invention, the following Patent Documents 1 and 2 by the same applicant as the present invention already exist.

Japanese Patent No. 5485685 Japanese Patent No. 5697941

  However, in the conventional structure as described above, it is unavoidable that a slight gap is formed between the bottom surface of the head portion 4a and the divided piece 5a of the partition plate 5, so that it is possible to prevent rain from entering this gap. There is a problem that the melting water of snow melts down to the duct part 4b due to the capillary phenomenon, and even if the partition plate 5 is not equipped, the melting of rain or snow that has entered the head part 4a. It was difficult to prevent the water from going to the duct portion 4b only by the inclination.

  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 capable of reliably preventing melted water such as rain and snow from being guided to a duct portion and flowing down.

The present invention is an intake duct for taking in outside air as engine intake air from an air intake opening to the outside in the vehicle width direction of a head portion that rides on the upper surface of a cab of a vehicle, the rear surface of the cab being a rear surface of the cab. The air inlet is opened so as to avoid a portion directly above the duct extending downward along the line, and the head portion is divided into front and rear with the rear end of the air inlet as a boundary, and the divided head portion is opened at the rear portion. A vertical wall for blocking water accumulated on the bottom surface of the head portion is provided below the end surface.

  Thus, in this way, since the air inlet is opened avoiding just above the duct part, the outside air flows from the front side of the head part toward the duct part, and between the wraparounds. When rain or snow collides with the wall surface or falls on the bottom surface, it deviates from the flow of the outside air to prevent entry into the duct part, and also direct entry of rain or snow from the air intake into the duct part. Further, the vertical walls prevent the rainwater and the snow melted from remaining in the head portion from entering the duct portion side and are reliably dammed. It should be noted that the melted water of rain and snow which is blocked by the vertical wall and remains in the head part can be discharged to the outside of the head part by sloping the bottom surface of the head part or providing a drain port. You can leave it as it is.

Further, in the present invention, the head portion dividing structure before and after the boundary of the rear end of the air inlet, so to form a vertical wall below the open end face at the rear portion of the divided head portion, the head The vertical wall can be easily integrally formed during blow molding of the duct part including the rear part of the head part.Before attaching the front part of the head part even if the vertical wall is attached as a separate part by post-processing. At the stage of, it is possible to easily install the vertical wall.

  If the head part is divided into front and rear, the front part of the head part in which the partition plate is integrated by wrapping it with molten resin as an insert and solidifying the partition plate for smoothly circling the outside air is used. It becomes possible to easily mold, and it is also possible to efficiently secure a large cross-sectional area of the flow path as compared with a case where a partition plate which is a separate component is assembled by post-processing.

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

  (I) According to the first aspect of the present invention, the outside air is circulated from the front side of the head portion toward the duct portion, and rain or snow is deviated from the outside air flow during the wraparound. It is possible to prevent the invasion of the duct part from the air intake, and also to prevent the direct ingress of rain or snow from the air intake to the duct part. Moreover, the melted water of the rain or snow remaining in the head part can be prevented. The vertical wall can surely prevent the water from entering the duct portion side, so that it is possible to reliably prevent the melted water of rain or snow from being guided to the duct portion and flowing down.

(II) According to the invention described in claim 1 of the present invention, it is possible to easily integrally molded vertical wall during blow molding of the duct portion including a rear portion of the head portion, also, as a separate part of the vertical wall Even when mounting by post-processing, the vertical wall can be easily mounted before the front part of the head part is assembled.

It is a perspective view showing in an exploded state an example of an embodiment of the present invention. It is a perspective view which shows a prior art example. FIG. 3 is a perspective view showing the intake duct of FIG. 2 in a disassembled state.

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

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

The intake duct 7 in the present embodiment is installed on the rear surface of the cab 1 (see FIG. 2) of the transport vehicle in the same manner as the conventional intake duct 3 described above with reference to FIGS. The air is taken in from an air intake 2 that extends and is open to the vehicle width direction outer side of the head portion 4a that rides on the upper surface of the cab 1, and the lower surface of the rear portion of the head portion 4a is taken in. The air intake 2 is opened so as to avoid a portion directly above the duct 4b extending downward along the rear surface of the cab 1, and water collected on the bottom surface 11 of the head 4a at a position adjacent to the rear end of the air intake 2. are Bei Ete the vertical wall 10 of blocking.

Moreover , the head portion 4a is divided into a rear portion 4ar of the head portion 4a, which is directly above the duct portion 4b, and a front portion 4af which extends forward and rides on the upper surface of the cab 1. The side surface 8 is left outside the vehicle width direction of 4ar, while the outside of the front portion 4af in the vehicle width direction is opened to form the air intake port 2.

  That is, the head portion 4a in this embodiment has a structure in which 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 lower side of the open end surface 9 in the rear portion 4ar of the divided head portion 4a. A vertical wall 10 is formed in the vehicle width direction so that water accumulated on the bottom surface 11 of the head portion 4a can be dammed up by the vertical wall 10.

  Here, when the vertical wall 10 is formed below the open end surface 9 of the rear portion 4ar, the vertical wall 10 may be integrally formed at the time of blow molding the duct portion 4b including the rear portion 4ar of the head portion 4a. Although good, it is also possible to attach the vertical wall 10 as a separate component by post-processing before assembling the front portion 4af of the head portion 4a.

  In addition, the bottom surface 11 of the head portion 4a is provided with a slope for returning the water accumulated on the bottom surface 11 to the side of the air intake 2, and the drip channel 12 provided at the lower end of the air intake 2 removes the water. It is configured to be collected, guided to the vertical wall 10 side, and discharged from the drain port 13 to the outside of the head portion 4a.

  When forming the drain port 13 for discharging water, a recess is formed in the lowermost position of the front portion 4af of the head portion 4a which is fitted to the rear portion 4ar, and the front portion 4af is formed. A gap may be formed between the vertical wall 10 and the recessed portion when fitted to the rear portion 4ar, and the gap may be used as the drainage port 13.

  Further, in the present embodiment, the outside air taken in from the air inlet 2 toward the inner side in the vehicle width direction flows into the head portion 4a toward the rear of the vehicle, so that the head can be smoothly guided so as to be guided. The partition plate 14 is built in the portion 4a. When the partition plate 14 is built in, the partition plate 14 is wrapped as an insert with a molten resin to be solidified, whereby a head in which the partition plate 14 is integrated. It is possible to mold it as the front part 4af of the part 4a.

  Thus, if the intake duct 7 is configured in this way, the air intake 2 is opened so as to avoid an area directly above the duct portion 4b, so that outside air wraps around from the front side of the head portion 4a and enters the duct portion 4b. The flow becomes a heading flow, and rain and snow collide with the wall surface or fall to the bottom surface while wrapping around, deviating from the flow of the outside air to prevent entry into the duct part 4b, and from the air intake port 2 to the duct part. It is also possible to prevent direct intrusion of rain or snow into the 4b, and to surely prevent the melted water of the rain or snow remaining in the head portion 4a from entering the duct portion 4b side by the vertical wall 10. become.

  In addition, the melted water of rain and snow which is prevented from entering the duct portion 4b and remains in the head portion 4a flows down to the drip channel 12 due to the inclination of the bottom surface 11 of the head portion 4a, and is collected. It is guided to the vertical 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-described embodiment, the outside air is circulated from the front side of the head portion 4a to the flow toward the duct portion 4b, and rain or snow is deviated from the flow of the outside air to the duct portion 4b during the wraparound. It is possible to prevent the intrusion of rain and snow directly from the air intake 2 to the duct portion 4b, and moreover, to dissolve the rainwater and snow melt remaining in the head portion 4a. Since the vertical wall 10 can surely prevent the water from entering the duct portion 4b side, it is possible to reliably prevent the melted water of rain or snow from being guided to the duct portion 4b and flowing down.

  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 vertical wall 10 is provided below the open end surface in the rear portion 4ar of the divided head portion 4a. Since it is formed, the vertical wall 10 can be easily integrally formed at the time of blow molding of the duct portion 4b including the rear portion 4ar of the head portion 4a. Even if there is, the vertical wall 10 can be easily attached at a stage before the front portion 4af of the head portion 4a is assembled.

  Further, if the head portion 4a is divided into front and rear parts, the partition plate 14 for smoothly circling the outside air is wrapped as an insert with molten resin and solidified, so that the partition plate 14 is integrated with the head portion 4a. The front portion 4af can be easily formed, and the flow passage cross-sectional area can be efficiently secured to be larger than in the case where the partition plate 14 which is a separate component is assembled by post-processing.

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

1 Cab 2 Air intake 4a Head part 4ar Rear part 4b Duct part 7 Intake duct 9 Open end face 10 Vertical wall

Claims (1)

An intake duct for taking in outside air as engine intake air from an air intake opening on the upper side of a head portion of a vehicle cab that is open to the outside in the vehicle width direction, and extends downward along the rear surface of the cab from the rear lower surface of the head portion. The air inlet is opened while avoiding immediately above the extending duct portion, and the head portion is divided into front and rear with the rear end of the air inlet as a boundary, and the lower side of the open end surface in the rear portion of the divided head portion. An air intake duct, characterized in that a vertical wall is provided for damming water accumulated on the bottom surface of the head portion.

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