JP6594173B2 - Air intake duct - Google Patents

Description

  The present invention relates to an intake duct.

  Generally, 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 air near the ground, which contains a lot of dust. Therefore, it is preferable to take in a sufficiently high part of the clean air from the ground, and there is a risk of the rainwater and snow jumping together near the ground. It is preferable to incorporate.

  For this reason, in a large transport vehicle, as shown in an example in FIG. 5, an intake duct b extending in the vertical direction is installed on the rear surface of the cab a. A duct main body d having an outer shell structure with an air intake c that is taken in as an intake air for the engine is formed on the upper side, and a louver e that covers the air intake c and prevents entry of air other than outside air. Yes.

  Here, in the intake duct b, the air intake c is greatly open toward the rear of the vehicle, and further, the air intake c extends to the right side surface on the outer side in the vehicle width direction. This is merely an auxiliary extension to the right side so that the air intake c is not completely blocked even if the hood of the cargo bed covers the rear surface of the intake duct b.

  Therefore, the air intake c in the following description refers only to the main opening range formed on the rear surface of the duct body d, and the opening range that wraps around to the right side is distinguished as an auxiliary intake c ′. And

  As prior art document information related to this type of intake duct, the following Patent Document 1 has already been proposed.

Japanese Patent No. 5325764

  However, in the conventional structure as described above, as schematically shown in FIG. 6, the main flow of the outside air (arrow A in FIG. 6) taken in from the air intake port c that opens greatly toward the rear of the vehicle is the duct body. The rainwater that collides with the surface facing the air intake c in d and flows so as to descend along the facing surface, and the rainwater taken in along with the flow of the outside air is separated from the flow of the outside air by inertia. Therefore, the drip channel f must be installed directly below the surface facing the air inlet c in the duct body d. In other words, the drip channel f collides with the main flow of the outside air, resulting in a significant increase in intake resistance.

  In the schematic illustration of FIG. 6, the drip channel f is shown alone for the sake of convenience of explanation. However, the internal partition component or the reinforcing member incorporated so as to partition the inside of the duct body d into a plurality of flow paths. Of course, it may be formed integrally with a part of the skeleton member or the like.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the intake resistance by avoiding a collision between a main flow of outside air taken in from an air intake and a drip channel.

The present invention is an intake duct that is installed on the rear surface of a cab of a transport vehicle and extends in the vertical direction and takes in outside air as an intake air for an engine from an air intake opening on the upper side thereof, and the air intake is opened upward A duct body having an outer shell structure, a side branch portion formed at a lower portion of the duct body and having an upper end opened in the duct body and a lower end opened to the outside, and stretched over the air intake port. A mesh that collects the mesh, a louver that covers the air intake port together with the mesh to prevent intrusion other than outside air , and an inner wall that is located directly below the mesh in the duct body and forms a surface extending downward from the mesh And a drip channel that catches rainwater flowing down the inner wall and guides it to the upper end of the side branch portion.

  Thus, in this way, when outside air is sucked from the air intake port, rainwater that passes through the louver and is accompanied by the flow of outside air is collected by the mesh, and is collected to the inner wall of the duct body directly below the mesh. And is captured by the drip channel, guided to the upper end of the side branch portion by the drip channel, flows down into the side branch portion, and is discharged from the lower end to the outside.

  As a result, rainwater is not included in the main flow of outside air that is taken in from the air intake and collides with the surface facing the air intake, and a drip channel is formed immediately below the surface facing the air intake in the duct body. While it is not necessary to install it, it is only necessary to provide a drip channel on the inner wall directly below the mesh where the main flow of the outside air does not pass, so that collision between the main flow of the outside air taken in from the air intake and the drip channel is avoided. Reduction is achieved.

  Further, in the present invention, it is preferable to form a bead as a drip channel on the inner wall immediately below the mesh in the duct body, which is recessed outwardly in a groove shape and forms a downward slope toward the upper end of the side branch portion. For example, rainwater flows down the inner wall directly under the mesh in the duct body, enters into the groove shape of the bead due to surface tension, is guided to the upper end of the side branch part by the bead inclination, and flows into the side branch part. While maintaining the function as a channel, it is possible to avoid overhanging the inside of the duct body to further reduce the intake resistance, and it is also possible to contribute to the strength improvement of the duct body by forming beads It becomes.

  Furthermore, in the present invention, it is preferable that the bead is formed in at least two stages at the top and bottom, and in this way, the rainwater that cannot be taken into the groove shape by the first stage bead is also the second and subsequent stages. It becomes possible to collect the rainwater more reliably by taking it into the groove shape by means of the bead, and it is also possible to further improve the strength of the duct body by increasing the formation of the bead.

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

  (I) According to the invention described in claim 1 of the present invention, it is not necessary to install a drip channel immediately below the surface facing the air intake in the duct body, and it is directly below the mesh through which the main flow of the outside air does not pass. Since it is only necessary to provide a drip channel on the inner wall, collision between the main flow of outside air taken in from the air intake and the drip channel can be avoided, and the intake resistance can be reduced. It can be greatly improved.

  (II) According to the invention described in claim 2 of the present invention, when the drip channel is provided on the inner wall immediately below the mesh in the duct body, the overhang to the inside of the duct body is avoided while maintaining the function as the drip channel. Thus, the intake resistance can be further reduced, and the bead formation can contribute to the improvement of the duct body strength.

  (III) According to the invention described in claim 3 of the present invention, rainwater that could not be taken into the groove shape by the first stage bead is taken into the groove shape by the second and subsequent beads, so that more reliable rainwater can be obtained. The recovery can be achieved and the strength of the duct body can be further improved by increasing the formation of beads.

It is a perspective view which shows an example of the form which implements this invention. It is an enlarged view which shows the detail of the air intake duct of FIG. It is the figure which looked at the air intake duct of FIG. 2 from the vehicle rear. It is a schematic diagram which shows the flow of the external air taken in into the air intake duct of FIG. It is a perspective view which shows a prior art example. It is a schematic diagram which shows the flow of the external air taken in into the air intake duct of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show an example of an embodiment for carrying out the present invention. As shown in FIGS. 1 to 4, the intake duct 1 in this embodiment is the same as the conventional intake duct b described above with reference to FIG. Similarly to the case, the outside air is installed as the intake air for the engine from the air intake 3 that is installed on the rear surface of the cab 2 (see FIG. 1) of the transporting vehicle and extends in the vertical direction and opens greatly toward the rear of the vehicle on the upper side. The auxiliary intake 3 'is formed so as to go around the right side surface on the outer side in the vehicle width direction. However, even if the hood of the cargo bed covers the rear surface of the intake duct 1, the air intake 3 is The air intake port 3 is only extended to the right side so as not to be completely blocked, and the air intake port 3 in the following description refers only to a main opening range directed toward the rear of the vehicle. .

  In this embodiment, the air inlet 3 is opened to the upper side to form the outer shell structure, and the duct main body 4 is formed in the lower portion of the duct main body 4 so that the upper end is opened in the duct main body 4 and the lower end. The side branch part 5 opened to the outside through a drain port (not shown), the mesh 6 stretched over the air intake 3 and collecting rainwater, and the mesh 6 together with the air intake 3 cover the air intake 3 And a drip channel provided on the inner wall immediately below the mesh 6 in the duct body 4 and catching rainwater flowing down the inner wall and guiding it to the upper end of the side branch portion 5. In the case of the example shown here, the inner wall immediately below the mesh 6 in the duct body 4 is recessed in a groove shape to the outside and descends toward the upper end of the side branch portion 5. The bead 8 forming are so as to form upper and lower three stages as drip channel.

  The mesh 6 may be made of either metal or resin. However, the mesh 6 is formed with a high porosity so as not to cause an increase in intake resistance as much as possible. It is important that the eyes are not too rough so that they can be collected.

  Thus, when the outside air is sucked from the air intake port 3 in this way, the rainwater that passes through the louver 7 and is accompanied by the flow of the outside air is collected by the mesh 6, and the duct immediately below the mesh 6 is collected. Rainwater flows down the inner wall of the main body 4 and enters into the groove shape of the bead 8 due to surface tension, and is guided to the upper end of the side branch portion 5 by the inclination of the bead 8 and flows down into the side branch portion 5 from the lower end thereof. It is discharged outside.

  As a result, rainwater is not contained in the main flow of external air (arrow A in FIG. 4) that is taken in from the air intake 3 and collides with the surface facing the air intake 3, and the air intake in the duct body 4 is eliminated. While it is not necessary to install a drip channel directly below the surface facing the inlet 3, it is only necessary to provide a bead 8 as a drip channel on the inner wall directly below the mesh 6 through which the main flow of outside air does not pass. The collision between the main flow of the outside air and the drip channel is avoided, and the intake resistance is reduced.

  In particular, in the case of this embodiment, the bead 8 is formed as a drip channel that is recessed outwardly and has a downward slope toward the upper end of the side branch portion 5, so that the duct is maintained while maintaining the function as a drip channel. It is possible to avoid overhanging the inside of the main body 4 to further reduce the intake resistance, and it is possible to contribute to improving the strength of the duct main body 4 by forming the beads 8.

  In addition, since the bead 8 in this embodiment is formed in three upper and lower stages, rainwater that could not be taken into the groove shape by the first stage bead 8 is taken into the groove shape by the second and subsequent beads 8 and further into the groove shape. It is possible to reliably collect rainwater, and to increase the strength of the duct body 4 by increasing the formation of the beads 8.

  The bead 8 formed by recessing in the groove shape to the outside can be used as a drip channel without any trouble. The newly installed mesh 6 collects rainwater on the air intake 3 side to collect the drip channel (bead 8). ), The surface facing the air intake 3 is generally the installation side to the rear surface of the cab, so it is difficult to project outward. In this case, it is easy to project outward.

  As described above, according to the above-described embodiment, it is not necessary to install a drip channel immediately below the surface facing the air intake 3 in the duct body 4, and the inner wall directly below the mesh 6 through which the main flow of the outside air does not pass. Therefore, it is only necessary to provide the bead 8 as a drip channel, so that the collision between the main flow of the outside air taken in from the air intake 3 and the drip channel can be avoided, and the intake resistance can be reduced. This can greatly improve the conventional technology.

  Further, when the drip channel is provided on the inner wall immediately below the mesh 6 in the duct main body 4, it is possible to avoid the protrusion to the inside of the duct main body 4 while maintaining the function as the drip channel and further reduce the intake resistance. In addition, the formation of the bead 8 can contribute to the improvement of the strength of the duct body 4, and particularly in the case of this embodiment, the rainwater that has not been taken into the groove shape by the first-stage bead 8 can also be second-staged. The subsequent bead 8 can be taken into the groove shape for more reliable rainwater recovery, and the formation of the bead 8 can be increased to further improve the strength of the duct body 4.

  Note that the intake duct of the present invention is not limited to the above-described embodiment, and the drip channel does not necessarily have to be formed by a bead, and is incorporated so as to divide the inside of the duct body into a plurality of flow paths. Of course, it may be arranged in the form of a bowl on a part of the internal partition component or the reinforcing skeleton member, and various other modifications can be made without departing from the scope of the present invention. It is.

1 Intake Duct 2 Cab 3 Air Intake 4 Duct Body 5 Side Branch 6 Mesh 7 Louver 8 Bead (Drip Channel)

Claims (3)

An intake duct that is installed on the rear surface of a cab of a transport vehicle and extends in the vertical direction and takes in outside air as an intake air for an engine from an air intake opening at an upper side thereof, and opens the outer intake shell to the upper side. A duct main body having a structure, a side branch portion formed at the lower portion of the duct main body, having an upper end opened in the duct main body and opened at the lower end to the outside, and stretched over the air intake port to collect rainwater. A mesh, a louver that covers the air intake port together with the mesh to prevent intrusion other than outside air, an inner wall that is located directly below the mesh in the duct body and that extends downward from the mesh; and An air intake duct comprising a drip channel that captures rainwater flowing down an inner wall and guides it to an upper end of the side branch portion.   The intake duct according to claim 1, wherein a bead that is recessed in a groove shape toward the outside and has a downward slope toward the upper end of the side branch portion is formed as a drip channel on an inner wall immediately below the mesh in the duct body.   The intake duct according to claim 2, wherein the bead is formed in at least two stages.

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