JP2017194031A - Intake duct - Google Patents

Abstract

The present invention provides an intake duct that can reliably prevent a phenomenon that rainwater poured onto an upper surface of a duct body is sucked from an air intake. An air intake duct (6) for taking in outside air from an air intake (2) as engine intake air is provided with a duct body (4) having a shell structure with the air intake (2) opened to the side surface. A drain passage 7 is formed around the air inlet 2 for receiving rainwater flowing down the upper surface of the duct body 4 and flowing down the side of the air inlet 2. [Selection diagram] Fig. 1

Description

  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, but 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.

  In addition, as prior art document information explaining general existing technology related to the present invention, the following patent documents 1, 2 and the like by the same applicant as the present invention already exist.

Utility Model Registration No. 2566732 JP 2002-310022 A

  However, as shown in FIG. 5 which is a front view of the intake duct 3 as viewed from the front of the vehicle, the intake duct 3 that opens the air intake 2 on the upper surface of the cab 1 rides on the upper surface from the rear surface side of the cab 1 and The head portion 4a having the entrance 2 opened to the outside in the vehicle width direction (left side in FIG. 5) is provided, but the design aesthetic appearance of the cab 1 is not impaired by the presence of the head portion 4a. Since the upper surface of the head portion 4a is inclined downward in the vehicle width direction, the rain water that has poured onto the upper surface of the head portion 4a flows down toward the vehicle width direction as indicated by the arrow A, and the air intake There was a possibility that water drops would be sucked into the intake duct 3 at the upper edge of the inlet 2.

  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 reliably prevent a phenomenon in which rainwater poured on the upper surface of a duct body is sucked from an air intake.

  The present invention is an intake duct that takes in outside air from an air intake as engine intake air, and includes a duct main body that has an outer shell structure that opens to the side of the air intake, and the air intake on the upper surface of the duct main body. A drainage passage is formed around the inlet for receiving rainwater flowing down the upper surface of the duct body and flowing down to the side of the air intake.

  In this way, rainwater that flows down and flows onto the upper surface of the duct body is received by the drainage passage and is flushed to the side of the air intake, so that water droplets form at the upper edge of the air intake. The phenomenon of being sucked into the intake duct is prevented.

  Further, in the present invention, it is preferable to form the drainage passage by a groove shape recessed in the upper surface of the duct body, and in this way, the drainage passage can be easily formed by a mold when blow-molding the intake duct. In addition, it is possible to prevent the appearance from deteriorating as an inconspicuous drainage passage having no protruding portion in appearance.

  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 possible to receive rainwater that flows down and flows onto the upper surface of the duct body by the drainage passage, so that it flows down to the side of the air intake. It is possible to reliably prevent a phenomenon in which raindrops are sucked.

  (II) According to the invention described in claim 2 of the present invention, the drainage passage can be easily formed by the mold at the time of blow molding of the intake duct, and the drainage passage is hardly visible and has no protruding portion in appearance. It can also prevent the appearance from deteriorating.

It is a perspective view which shows an example of the form which implements this invention. It is the front view which looked at the air intake duct of FIG. 1 from the vehicle front. It is the perspective view which looked at the intake duct of FIG. 1 from the vehicle diagonally back. It is a perspective view which shows a prior art example. It is the front view which looked at the air intake duct of FIG. 4 from the vehicle front.

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

  FIGS. 1 to 3 show an example of an embodiment for carrying out the present invention. An intake duct 6 in this embodiment is substantially the same as the cab 1 in the same manner as the conventional intake duct 3 described above with reference to FIGS. A duct body 4 that is installed on the rear surface and forms an outer shell structure, and a louver 5 that covers the air intake 2 and prevents direct rainwater entry (similarly prevents snow intrusion). The head portion is configured to take in outside air as intake air for the engine from an air intake port 2 opened on the vehicle width direction outer side (left side in FIG. 2) of the head portion 4a riding on the upper surface of the cab 1. Around the air intake 2 on the upper surface of 4a (the upper surface of the duct body 4), the upper surface of the head portion 4a is received by rainwater that flows outward in the vehicle width direction as indicated by an arrow A (see FIGS. 2 and 3). The air intake 2 Was formed a drain passage 7 to drop flowing aside has become characterized.

  The drainage passage 7 is formed in 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 7 is formed by forming a groove shape extending in the vehicle front-rear direction along the upper edge of the vehicle. However, since this type of intake duct 6 is generally manufactured by blow molding, What is necessary is just to shape | mold the said drainage channel 7 integrally with a type | mold.

  The upper surface of the head portion 4a (upper surface of the duct body 4) in the present invention refers to a range that can be seen when the head portion 4a (duct body 4) is viewed from above, and in particular this embodiment In this case, the drainage passage 7 also extends in an inclined portion at the front and rear positions of the upper surface of the head portion 4a, and both sides of the air intake 2 are extended obliquely downward to respectively lower end positions of the air intake 2 It has come to the vicinity.

  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 7 and is washed off 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 to the outside in the vehicle width direction can be received by the drainage passage 7 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 this embodiment, the drainage passage 7 is formed by the groove shape recessed in the upper surface of the head portion 4a. Therefore, the drainage passage 7 is easily formed by a mold when the intake duct 6 is blow-molded. In addition, the appearance of the drainage passage 7 that does not have a protruding portion in appearance and is not noticeable can be prevented from deteriorating in appearance.

  The intake duct of the present invention is not limited to the above-described embodiment. For example, a rib or drip channel as a separate part is attached to the upper surface of the duct body or the upper edge portion of the air intake to provide a drainage passage. In the case of a transport vehicle equipped with a wind deflector on the ceiling surface of the cab, it is also effective against rain water flowing from the wind deflector, and a head that rides on the ceiling surface of the cab. The present invention can be applied to an intake duct of a type in which an air intake opening is opened below the ceiling surface of the cab without providing a portion, and other various modifications can be made without departing from the gist of the present invention. Of course.

1 Cab 2 Air intake 4a Head 6 Intake duct 7 Drainage passage

Claims (2)

  An intake duct for taking outside air as engine intake air from an air intake, comprising a duct main body having an outer shell structure that opens to the side of the air intake, and around the air intake on the upper surface of the duct main body An intake duct characterized in that a drainage passage is formed for receiving rainwater flowing down the upper surface of the duct body and flowing it down to the side of the air intake.   2. The air intake duct according to claim 1, wherein the drainage passage is formed by a groove shape recessed in the upper surface of the duct body.

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