JP2017193975A - Air intake duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake duct capable of reliably preventing a phenomenon that rainwater that has poured down on the upper surface of a head portion of the intake duct is sucked from an air intake. An intake duct (7) for taking in outside air as engine intake air from an air intake port (2) opened to the outside in the vehicle width direction of a head portion (4a) that rides on the upper surface of a cab of a vehicle, the cab from the rear lower surface of the head portion (4a). The air intake port 2 is opened so as not to be located immediately above the duct part 4b extending downward along the rear surface of the air intake part, and the water accumulated on the bottom surface 11 of the head part 4a is blocked at a position adjacent to the rear end of the air intake port 2. The vertical wall 10 was provided. [Selection diagram] Figure 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.

  Therefore, in a large transport vehicle, an intake duct that extends in the vertical direction is installed on the rear surface of the cab. However, as shown in FIG. 2, in recent years, the cab 1 can take in cleaner outside air. An air intake duct 3 having an air intake port 2 opened at the upper surface is proposed.

  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, it is possible to prolong the life of the air cleaner and to maintain the operation state with little pressure loss for a long period of time and to improve the fuel efficiency.

  Here, the duct body 4 forming the outer shell structure of the intake duct 3 rides on the upper surface from the rear surface side of the cab 1 and opens the air intake port 2 to the outside in the vehicle width direction (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 2 toward the inside in the vehicle width direction. Since the outside air flows in the head portion 4a so as to circulate toward the rear of the vehicle, as shown in an exploded view in FIG. 3, a partition plate 5 for smoothly guiding the circulation of the outside air flows in the head portion 4a. Built-in.

  Conventionally, the partition plate 5 of this type is configured such that separate parts 5a and 5b are inserted and assembled from the air intake port 2 after blow molding of the head portion 4a, and the air intake port 2 is assembled after the assembly. It is covered with louvers 6 to prevent direct rainwater falling (snow intrusion is similarly prevented).

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

  Here, the division piece 5a of the partition plate 5 is provided with an inclination to flow water accumulated on the bottom surface thereof back to the air intake 2 side, from a drain port (not shown) provided near the lower end of the air intake 2. It can be discharged out of the head portion 4a.

  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.

Japanese Patent No. 5485585 Japanese Patent No. 5697941

  However, in the conventional structure as described above, it is inevitable 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. There is a problem that snow melting water is led to the duct portion 4b by the capillary phenomenon and flows down, and even if the partition plate 5 is not equipped, the rain or snow that has entered the head portion 4a is melted. It was difficult to prevent water from moving toward the duct portion 4b only by the inclination.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an intake duct that can reliably prevent rain and snow melting water from being led to the duct portion and flowing down.

  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 so as to avoid the upper portion of the duct portion extending downward along the line, and a wall is provided at a position adjacent to the rear end of the air intake to block water accumulated on the bottom surface of the head portion. It is a feature.

  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 In addition, the rain and snow remaining in the head portion are reliably dammed so as not to enter the duct portion side by the dredging wall. It should be noted that the rain and snow melting water remaining in the head portion after being dammed by the dredging wall can be discharged out of the head portion by inclining the bottom surface of the head portion or providing a drain outlet. It ’s good if you keep it.

  Furthermore, in the present invention, it is preferable to divide the head part into front and rear parts 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. By doing so, it is possible to easily integrally mold the ridge wall during blow molding of the duct portion including the rear portion of the head portion, and even if the ridge wall is attached as a separate part by post-processing, the head portion If it is a stage before assembling the front part, the wall can be easily attached.

  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.

  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, outside air is circulated from the front side of the head portion to flow toward the duct portion, and rain and snow are allowed to deviate from the outside air flow during the wraparound. In addition to preventing the intrusion into the duct part, it is also possible to prevent the intrusion of rain and snow directly from the air intake into the duct part, and the rain and snow melting water remaining in the head part. Can be reliably dammed so as not to enter the duct portion side by the dredging wall, so that it is possible to surely prevent rain and snow melting water from being led to the duct portion and flowing down.

  (II) According to the invention described in claim 2 of the present invention, when the duct portion including the rear portion of the head portion is blow-molded, the ridge wall can be easily integrally formed, and the ridge wall is provided as a separate part. Even when attaching by post-processing, it is possible to easily attach the wall before assembling the front part of the head part.

It is a perspective view shown in the state which decomposed | disassembled an example of the form which implements this invention. It is a perspective view which shows a prior art example. It is a perspective view shown in the state which decomposed | disassembled the air intake duct of FIG.

  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 portions denoted by the same reference numerals as those in FIGS. 2 and 3 represent the same items.

  In the present embodiment, the intake duct 7 is installed on the rear surface of the cab 1 (see FIG. 2) of the transport vehicle in the vertical direction, as in the case of the conventional intake duct 3 described with reference to FIGS. The head portion 4a that extends and rides on the upper surface of the cab 1 is configured to take outside air as an intake air for the engine from an air intake port 2 that opens to the outside in the vehicle width direction. The air intake 2 is opened while avoiding directly above the duct portion 4b extending downward along the rear surface of the cab 1, and water collected on the bottom surface 11 of the head portion 4a at a position adjacent to the rear end of the air intake 2 It is characterized by the provision of a wall 10 for damming.

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

  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 dredging wall 10 extending in the vehicle width direction is formed so that water accumulated on the bottom surface 11 of the head portion 4a can be blocked by the dredging 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.

  Further, in the present embodiment, since the outside air taken in from the air intake port 2 toward the inside in the vehicle width direction flows into the rear of the vehicle in the head portion 4a, 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 a molten resin as an insert and solidified, whereby the partition plate 14 is integrated. It can be formed as a front portion 4af of the portion 4a.

  Thus, if the intake duct 7 is configured in this way, the air intake port 2 is opened so as to avoid the 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, thereby deviating from the flow of outside air and preventing entry into the duct portion 4b, and from the air intake port 2 to the duct portion. Direct rain and snow intrusion into 4b is also prevented, and rain and snow melting water remaining in the head portion 4a are surely blocked by the dredging wall 10 so as not to enter the duct portion 4b side. become.

  The rain and snow melting water remaining in the head portion 4a after being prevented from entering the duct portion 4b flows down to the drip channel 12 due to the inclination attached to the bottom surface 11 of the head portion 4a, and is recovered. The drip channel 12 leads to the wall 10 side and is 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 intrusion of rain and snow directly from the air inlet 2 into the duct portion 4b, and to remove the remaining rain and snow melt in the head portion 4a. Since it can be surely dammed so as not to enter the duct portion 4b side by the dredging wall 10, it is possible to reliably prevent rain and snow-melting water from being led 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 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 the front and rear parts, the head part 4a in which the partition plate 14 is integrated by enclosing 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.

  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 7 Intake duct 9 Open end face 10 竪 Wall

Claims (2)

  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 An air intake comprising an eaves wall that opens the air intake while avoiding a portion directly above the extending duct, and blocks water accumulated on the bottom surface of the head at a position adjacent to the rear end of the air intake. duct.   2. The air intake according to claim 1, wherein the head part is divided into front and rear parts with the rear end of the air intake as a boundary, and a flange wall is formed below the open end surface in the rear part of the divided head part. duct.

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