JP5846878B2 - Air circulation device - Google Patents

Description

  The present invention relates to an air circulation device provided in a bonnet that covers an engine room that houses an engine supported by a vehicle body of a work vehicle and an engine accessory.

  In the conventional air circulation device, an air scoop that forms an air circulation port using an opening provided in the bonnet is used in order to improve the air circulation property inside and outside the bonnet. For example, in the air introduction technique for a tractor described in Patent Document 1, outside air that has flowed into the hood via an outside air inlet provided in a through-hole formed in the upper panel of the bonnet is side by side on the upper panel of the bonnet. It is configured to be sent from the panel to the air conditioning unit through the air filter section and the communication path. On the surface side of the bonnet, an air intake cover that covers the through hole of the upper panel extends from the upper panel to the left and right side panels, and an air intake slit is formed in the region of the side panel. Thereby, in this technique, the structure which takes in external air from the right and left of a bonnet is employ | adopted, and it is suppressed that rain dew, garbage, dust, etc. enter a bonnet. However, in this configuration, since the intake cover extends over almost the entire circumference in the transverse direction of the bonnet, there arises a problem that the flow resistance in the outside air flow from the intake slit to the outside air inlet increases. Furthermore, there is an additional problem that the presence of such an air intake cover has an excessive influence on the appearance design.

  Patent Document 2 discloses an air introduction technique in which an air flow passage is formed only on the upper surface of an upper panel in order to supply outside air to an intercooler disposed in a bonnet. In this technique, a cover that covers the bonnet opening formed on the upper surface of the upper panel extends in the longitudinal direction of the vehicle body, and an outside air intake is formed at the front end of the cover. In order to prevent rain and car wash water from directly entering the bonnet opening located just behind the outside air intake, a draining plate is provided. However, with this configuration, the water and dust that have passed over the draining board enter the bonnet through the bonnet opening as it is, and it is easy for engines and engine accessories that dispose of water and dust that are located directly under the bonnet opening. The problem remains.

  Furthermore, Patent Document 3 discloses an air introduction technique for dropping water that has entered the bonnet through an air scoop and avoids electrical components in the bonnet. In this technology, the outside air introduced from the outside air inlet of the air scoop enters the bonnet through the through hole provided in the upper panel, passes through the intercooler arranged directly below the through hole, and is discharged from the outlet. A cooling air passage is formed as described above. Accordingly, the water that has entered the cooling air passage from the outside air introduction port flows out from the discharge port that is positioned so as to avoid electrical components and the like. However, since water once entering the cooling air passage passes through the intercooler, waterproofing against the intercooler is not considered at all. Therefore, such an arrangement cannot be adopted for an air circulation device for the purpose of air circulation to equipment that dislikes contact with water.

Japanese Patent Laying-Open No. 2001-1742 (paragraph number [0034-0038], FIG. 4) Japanese Utility Model Publication No. 64-9816 (page 4-8, FIG. 1) Japanese Utility Model Publication No. 5-34977 (page 2-4, FIG. 1)

  In view of the above circumstances, an object of the present invention is to provide an air circulation device using an air scoop capable of avoiding the entry of water as much as possible to an apparatus that dislikes contact with water.

In order to achieve the above object, an air flow device according to the present invention provided on a hood that covers an engine room that houses an engine supported by a vehicle body of a work vehicle and an engine accessory is provided on an upper panel of the bonnet. An air scoop portion that forms an air circulation port having an opening surface that opens toward the front of the vehicle body, a porous plate that covers the air circulation port from the inside, and water droplets that have passed through the porous plate dropped into the engine compartment In order to guide to the permissible region, a guide plate is provided below the air circulation port and above the engine high-temperature equipment, and the guide plate overlaps with the entire front-rear direction of the vehicle body in the vertical direction. The engine high-temperature equipment is arranged so that a part of the engine high-temperature equipment overlaps with the guide plate in the vertical direction, and The remainder of the device so as not to overlap with the guide plate in the vertical direction, are arranged.

According to this configuration, the following combined advantages can be obtained.
1) Although the air scoop is provided in the upper panel, the air circulation port faces the front of the vehicle body, so even if high-temperature air heated by high-temperature engine equipment is released through the air circulation port, There is no risk of the driver's seat or cabin being exposed to hot air.
2) Most of the rainwater and car wash water that has entered the air circulation port is repelled by the perforated plate, and the flow rate of the remaining water droplets that have entered is reduced. Fall into.
3) Drops of water that have fallen through the holes in the perforated plate are received by the guide plate, guided to the permissible drop drop area where water drops in the engine room can be dropped, and then released there. Water droplet damage to auxiliary equipment can be suppressed.

  As one preferred embodiment, if a form in which the opening surface of the air circulation port is inclined toward the rear of the vehicle body is employed, the opening surface faces upward, and the efficiency of discharging high-temperature air from the engine room is increased.

In one preferred embodiment of the present invention, the distance between the guide plate and the air circulation port is configured to increase from the front of the vehicle body toward the rear of the vehicle body.

  Further, as a specific and preferred guide plate form, the guide plate includes a right guide plate portion that forms an outflow passage that extends downward while tilting downward from the center in the transverse direction of the engine room, and a transverse direction of the engine room. It is proposed to be composed of a left guide plate portion that forms an outflow passage that extends to the left while tilting downward from the center. As a result, the water droplets received by the guide plate can be distributed and discharged to the left and right side end regions of the engine room, which is a water drop dropping allowable region.

If an engine accessory serving as a high heat source is arranged in a place where the flow of air between the air circulation port is hardly disturbed by the guide plate as much as possible, the location is close to the rear of the guide plate. In that case, water droplets received by the guide plate must be avoided as much as possible from the rear end of the guide plate. For this purpose, in one preferred embodiment of the present invention, the guide plate is arranged in an inclined posture in which the front end of the guide plate is lower than the rear end with respect to the vehicle body direction. In addition, the vehicle body direction in this specification means the vehicle body longitudinal direction or the vehicle body longitudinal direction.

  In order to prevent rainwater and washing water from entering the engine room from the air scoop part having an air circulation port with an opening surface inclined to the rear of the vehicle body on the upper panel surface of the bonnet, it is transmitted through the upper panel surface. It is also important to block incoming water as much as possible. For this purpose, in one preferred embodiment of the present invention, the front edge portion of the air circulation port is formed as a draining piece portion protruding upward along the opening surface of the air circulation port.

It is a schematic diagram illustrating the basic structure of the air circulation apparatus by this invention. 1 is an overall side view of a tractor employing an air circulation device according to the present invention. It is a perspective view which shows the external appearance of a bonnet. It is a perspective view which shows a part of bonnet seen from the back side. It is a longitudinal cross-sectional view of the bonnet cut | disconnected by the longitudinal centerline. It is a top view of a bonnet. It is a perspective view which shows the exhaust system from a DPF muffler. It is a side view which shows typically the positional relationship of a perforated plate and a guide plate. It is a schematic diagram which shows the attachment point of the damper which assists a bonnet opening / closing operation | movement. It is a side view which shows typically the positional relationship of a perforated plate, a guide plate, and an engine high temperature apparatus in another embodiment.

  Before describing a specific embodiment of an air circulation device provided in a bonnet according to the present invention, its basic structure will be described with reference to FIG. The air flow device 100 of the present invention is provided in a bonnet 3 that covers an engine room that houses an engine supported by a vehicle body of a work vehicle and an engine accessory, and the basic components thereof are an air scoop portion 50, a perforated plate, and the like. 52 and a guide plate 53. The air scoop portion 50 is provided in the upper panel 5 of the bonnet, and has an opening surface (an inclined surface that rises toward the rear side from the front side of the vehicle body) that opens toward the front of the vehicle body and is inclined toward the rear of the vehicle body. 51 is formed. The perforated plate 52 covers the air circulation port 51 from the inside, and can be punched metal, a wire netting sheet, or various air circulations, but is preferably one that can eliminate the passage of pebbles and the like. The guide plate 53 is a high heat source such as an engine high-temperature device disposed in the engine room below the air circulation port 51 in order to guide the water droplets and the like that have passed through the perforated plate 52 to the water drop dropping allowable region in the engine room. It is provided above. The water drop drop allowable area is an area where there is no engine part or engine auxiliary equipment, particularly engine electrical equipment, which is desired to avoid water drop, and generally the left and right side end areas of the bonnet 3 are the water drop drop allowable areas. ing.

  Since the air circulation port 51 is located above the high heat source, the air circulation port 51 can directly release the high-temperature air heated by the high heat source and flowing upward. However, the positional relationship is reversed, such as rainwater or a car wash. The possibility of water pouring over high heat sources. For this reason, in the present invention, the water flowing into the air circulation port 51 is partially blocked by the perforated plate 52, and the speed of the water droplets flowing into the engine room is reduced. Further, a guide plate 53 is arranged at a position where many water droplets whose kinetic energy has been reduced by the perforated plate 52 are dropped, and this guide plate 53 receives the dropped water droplet and discharges it to the water drop drop allowable region. As can be seen from the enlarged side view of FIG. 1, the guide plate 53 does not completely block the linear air flow space between the high heat source and the air circulation port 51, but flows in the air flow space. Blocks about half of the cross section. More specifically, the rear end 53b of the guide plate 53 coincides with the rear edge of the air circulation port 51 with respect to the vehicle body direction in order to make the trade-off between the contact with the water droplet and the discharge of the high-temperature air suitable. Alternatively, it is preferable that the rear end of the air circulation port 51 extends further to the rear of the vehicle body, and the front end 53a of the guide plate 53 extends further from the front edge of the air circulation port 51 to the front of the vehicle body. If it says on another conditions, the vertical centerline HL of the opening surface of the air distribution port 51 will pass the vicinity of the rear end of the guide plate 53, and will cross the high heat source, the air distribution port 51, the guide plate 53, and the high heat source. A positional relationship is desirable.

  As can be understood from FIG. 1, when the left and right side end regions of the engine room are water drop allowance regions, the guide plate 53 is moved to the engine room in order to drop water drops received by the guide plate 53 to the side end region. A left guide plate portion 53A that forms an outflow passage that extends to the left while tilting downward from the center in the transverse direction, and a right guide plate portion 53B that forms an outflow passage that extends to the right while tilting downward from the center in the transverse direction of the engine room, It is good to comprise. Further, in order to minimize the possibility of water droplets unexpectedly falling to the high heat source beyond the rear end 53b of the guide plate 53, straddle the front side of the high heat source disposed above the engine room, and The guide plate 53 may be arranged in an inclined posture in which the front end 53a of the guide plate 53 is lower than the rear end 53b with respect to the vehicle body direction.

  Next, a specific embodiment in which the basic structure of the air circulation device 100 according to the present invention described above is applied to a tractor will be described with reference to the drawings. In this embodiment, the air circulation device 100 is mounted on the hood 3 of the tractor, the entire side of which is shown in FIG. The tractor includes a vehicle body 1 supported by a pair of left and right front wheels 11 and a pair of left and right rear wheels 6. The vehicle body 1 is constructed by a front frame 13, a clutch housing 14, a transmission case 15, and the like that are coupled in the longitudinal direction of the vehicle body. An engine 21 and an engine accessory 22 are mounted on the front frame 13. A driving part covered with a cabin 2 is provided in the rear half of the vehicle body 1. The tractor is provided with a DPF muffler 23 as an engine auxiliary machine that generates particularly high heat. In addition, the engine auxiliary equipment includes a cooling fan, a radiator, an intercooler, an oil cooler, an air cleaner, and a condenser and a battery for air conditioning. The engine room that houses the engine 21 and the engine accessory is formed as a space covered by the hood 3 above the front frame 13.

  The bonnet 3 is a full open type in which the entire bonnet 3 opens and closes and swings around the swing axis of the swing cross shaft unit 17 provided at the upper rear end thereof. The swing cross shaft unit 17 is provided on a cross beam of a support frame 16 erected on the clutch housing 8.

Hereinafter, the structure of the bonnet 3 will be described with reference to FIGS.
The bonnet 3 includes left and right side panels 4, an upper panel 5 having short skirt portions 5 a formed at both ends, and a front grill 6, which are individually manufactured and then assembled as one bonnet 3. Here, the upper end of the side panel 4 and the lower end of the skirt portion 5a of the upper panel 5 are connected to each other via connecting means formed as a bolt connecting portion 9 so that the surfaces thereof are flat. The left and right side panels 4 and the upper panel 5 are connected to each other via a bolt connecting portion (not shown) so as to be fitted to the inverted U-shaped front end created by them.

  The front grill 6 has a substantially quadrangular shape when viewed from the front, and has a grill opening 60 in which a grill pan is mounted at the center, and the front lamp unit 61 is mounted in four corner areas. . The upper left and right front lamp units 61 are set to illuminate near the front wheels for use as work lights, and the lower left and right front lamp units 61 are set to illuminate the front of the tractor as headlamps. ing.

  As clearly shown in FIGS. 4 and 5, the inner surface of the upper panel 5 and the inner surfaces of the left and right side panels 4 (hereinafter simply referred to as the inner surfaces of the bonnet 3) are spaced apart in the longitudinal direction of the bonnet 3. Several protruding ribs 30 are extended in the transverse direction of the bonnet 3. The projecting rib 30 has a two-stage cross section, and includes a wide base 30a and a narrow projecting portion 30b rising from the base 30a in order to enhance the rigidity of the bonnet 3. As described with reference to FIG. 1, the principle of the arrangement of the protruding ribs 30 is to follow a cutting line defined by a cross section in which the bonnet 3 is set at a predetermined longitudinal direction (front-rear direction) position. As is clear from FIG. 4, basically, it is formed over the inner peripheral surface of the bonnet 3, but only the partially protruding ribs 30 formed only on the inner surface of the side panel 4 and the inner surface of the upper panel 5. A partial protruding rib 30 is also arranged. In this embodiment, a protruding rib 30 extending obliquely on the inner surface of the upper panel 5 is also arranged. Furthermore, you may arrange | position the protruding rib 30 extended in the longitudinal direction of the bonnet 3 as needed.

  As shown in FIG. 4, the bolt connecting portion 9 that connects the inner surface of the upper panel 5 to the left and right side panels 4 is an inwardly recessed portion 91 formed at the upper end of the side panel 4 in this embodiment. And a sleeve body 92 provided at the lower end of the upper panel 5 so that it can be inserted into the recess 91 from above, and a connecting bolt 93 that is threaded into the screw hole of the sleeve body 92 through the through hole of the recess 91. . The upper panel 5 is assembled to the side panel 4 while fitting the sleeve body 92 of the upper panel 5 into the recess 91 of the side panel 4, and both are connected using the connecting bolt 93. The final bonnet 3 is created by connecting the front grille 6 to the front end portion of the assembled product of the inner surface of the upper panel 5 and the left and right side panels 4 using the same bolt connecting portion 9.

  From FIG. 4, it is understood that, with some exceptions, the protruding rib 30 extends in the transverse direction of the inner surface of the bonnet 3 starting from the bolt connecting portion 9. In other words, the bolt connecting portion 9 is arranged at the intersection area between the transverse line CL defined by using FIG. 1 and the dividing line train of the upper panel 5 and the left and right side panels 4. The rigidity around the connecting part is reinforced.

  As shown in FIGS. 4 and 6, an upper raised rib 31 is formed on the upper panel 5 of the bonnet 3 with the center in the transverse direction in the longitudinal direction of the vehicle body 1. The upper raised rib 31 has a dome-shaped cross section, and is narrowed from the front to the rear, creating a sense of speed. Further, a step 32 extending in the longitudinal direction of the vehicle body 1 is formed on both sides of the upper raised rib 31 in the upper panel 5. This step 32 is a step which becomes lower from the outside to the inside in the transverse direction. Therefore, the region sandwiched by both steps 32 is slightly lower than the outer region. The distance between the two steps 32 extends in the longitudinal direction so as to become shorter from the rear toward the front. Further, both the steps 32 are continuously formed on the upper surface portion of the front grill 6. The narrowed step 32 and the upper raised rib 31 extending in the middle of the step are convenient as a target for the driver's front center.

  As can be understood from FIGS. 2, 3, and 7, an air scoop portion 50 that constitutes the air circulation device 100 is formed at the rear center portion in the vehicle body direction of the upper panel 5, that is, above the DPF muffler 23. The DPF muffler 23 is one of the components of the exhaust system of the tractor and is enlarged by including a DPF (diesel particulate filter) that collects particulates contained in the exhaust gas flowing through the exhaust pipe 23. Yes. As shown in FIG. 7, the exhaust pipe exiting the DPF muffler 23 protrudes horizontally from the side of the engine room, and its final part is a rising exhaust pipe part (chimney-like exhaust pipe) 24, It stands up along the cabin 2 diagonally in front of the front. The DPF muffler 23 is disposed above the engine 20 and close to the upper surface of the bonnet 3.

  As shown in FIG. 8, the air circulation device 100 includes an air scoop portion 50 that forms an air circulation port 51, and a guide plate 53 that is disposed between the air circulation port 51 and the DPF muffler 23. As can be read from FIG. 3, the air scoop portion 50 is formed over a width slightly longer than ½ width of the upper panel 5, preferably about 3/4 width in this embodiment. The air scoop portion 50 is also called a bonnet scoop. An air circulation port 51 having an opening surface inclined rearward is formed at a front portion thereof, and an upper portion is drawn while drawing a gentle streamline from the upper end of the air circulation port 51. It is connected to the rear end region of the panel 5. A punching sheet (a perforated plate 52 made of a punching metal or a resin net is attached to the inner surface of the upper panel 5 or the air scoop part 50 by a fixing unit 54 so as to shield the air circulation port 51. The fixing unit 54 is porous. In order to securely fix the plate 52, it has a flange portion formed on the inner surface of the upper panel 5 or the air scoop portion 50, and the perforated plate 52 is attached to the flange portion via a bending bracket that is bolted. The edge of the upper panel 5 that forms the lower edge of the circulation port 51 is bent obliquely upward along the opening surface of the air circulation port 51 so as to function as a draining piece portion 50a. The scoop part 50 is not as high as the DPF muffler 23, rather than taking outside air into the engine room. The purpose of this is to release the air heated by the source to the outside, so that it is effective to avoid the high temperature air discharged from the air circulation port 51 from directly colliding with the front windshield of the cabin 2. The streamline shape of the air scoop unit 50 and the opening posture of the air circulation port 51 are employed.

  The guide plate 53 is positioned below the perforated plate 52 in order to receive water droplets or the like that have passed through the perforated plate 52, and the area thereof exceeds the vertical projection area of the air circulation port 51. At this time, the guide plate 53 is offset from the porous plate 52 to the front side of the vehicle body in order to reliably receive water droplets transmitted through the porous plate 52. That is, the rear end 53 b on the rear side in the vehicle body direction of the guide plate 53 is positioned below the rear edge portion of the air circulation port 51, and the front end 53 a of the guide plate 53 is further below the front edge portion of the air circulation port 51. Located in front. In other words, the front end 53a on the front side of the perforated plate 52 in the vehicle body direction is positioned in front of the bent bracket integrally formed with the perforated plate 52 and substantially serving as the front end portion of the perforated plate 52 in a side view. Due to the offset arrangement of the guide plate 53, the rear end 53b of the guide plate 53 is located at the same position as or slightly behind the upper end edge of the air circulation port 51 in side view. The water droplets passing through the vehicle fall into the guide plate 53 because the approaching flow velocity is slow. Furthermore, the lower end edge of the air circulation port 51 formed as the draining piece portion 50a and the rear end 53b of the guide plate 53 are positioned at substantially the same height level in a side view. Such an arrangement and posture of the guide plate 53 provides an advantage that the discharge flow path of the air heated by the DPF muffler 23 as a high heat source to the air circulation port 51 can be enlarged. The front end 53a and the rear end 53b of the guide plate 53 are bent upward, and the guide plate 53 creates a flowing water groove extending in the vehicle transverse direction.

  In this embodiment, since the left and right side end regions of the engine room are set as water drop allowance regions, the guide plate 53 is inclined downward from the center in the transverse direction of the engine room as shown in FIG. The left guide plate portion 53A extends to the left side, and the right guide plate portion 53B forms an outflow passage extending to the right side while inclining downward from the center in the transverse direction of the engine room. Further, in order to reduce the possibility that water drops that have fallen on the guide plate 53 will scatter over the rear end 53b of the guide plate 53 and fall on the DPF muffler 23, the front end 53a of the guide plate 53 is rearward with respect to the vehicle body direction. The inclined posture is lower than the end 53b.

  As can be understood from FIG. 9 in which the DPF muffler 23 is omitted for the sake of easy understanding, the guide plate 53 including the left guide plate portion 53A and the right guide plate portion 53B is a framework frame 3a of the bonnet 3 made of a plate material. Each is fixed by a fixture or welding not shown. Therefore, the guide plate 53 moves integrally with the bonnet 3 when the bonnet 3 is opened and closed, so that it does not interfere with maintenance and inspection in the engine room.

In FIG. 9, only the framework frame 3 a of the bonnet 3 is shown, but a swinging cross shaft unit 17 is provided across the rear end portion of the bonnet 3 and the support frame 16 to open and close the bonnet 3. It can swing. A pair of left and right dampers 37 for assisting the opening and closing operation of the bonnet 3 are provided across the bracket attached to the support frame 16 and the frame 3a.
[Another embodiment]

[1] The material of the integrally formed bonnet 3 and air scoop part 50 is preferably based on FRP (glass reinforced fiber), but may be other composite materials or metal materials. Of course, the bonnet 3 and the air scoop unit 50 may be configured separately.
[2] Although the guide plate 53 is attached to the bonnet 3 side that swings open and close, it may be attached to the vehicle body frame side.
[3] In the above-described embodiment, the opening surface of the air circulation port 51 is inclined to the rear of the vehicle body. However, the opening surface of the air circulation port 51 may be configured vertically instead. At this time, it is preferable that the perforated plate 52 is also arranged vertically, but the perforated plate 52 may be placed in a vehicle body rearward inclined posture. Further, the perforated plate 52 can be set in a vertical posture and the opening surface can be set in a vehicle body rearward inclined posture.
[4] The shape and arrangement of the DPF muffler 23 are not limited to the above embodiment. One of the other forms is shown in FIG. In this alternative embodiment, the DPF muffler 23 and the guide plate 53 are relatively far apart, and the air heated by the DPF muffler 23 is guided downward by the guide plate 53 along the curved surface of the air scoop 50. The air flows into the air circulation port 51 so as to be discharged to the outside.
[5] The engine high-temperature equipment, which is disposed below the air scoop 50 and is the source of the high-temperature air discharged by the air scoop 50, is a general muffler or other high-temperature engine accessories other than the DPF muffler 23. Or the engine itself.
[6] In the above-described embodiment, the bonnet 3 is composed of four divided bodies, that is, the upper panel 5, the left and right side panels 4, and the front grille 6. The front grill 6 may be integrated with the upper panel 5 or the left and right side panels 4, or the upper panel 5 and the left and right side panels 4 may be further divided. Alternatively, the upper panel 5 and the left and right side panels 4 may be integrated. Further, the left and right side panels 4 may be configured as a fixed bonnet fixed to the vehicle body 1.

  The air circulation device according to the present invention can be applied to a tractor, a mower such as a mid-mount mower or a front mower, a wheel loader, and a backhoe.

1 Car body 2 Cabin 3 Bonnet 4 Side panel 5 Upper panel 6 Front grille 21 Engine 23 Engine high temperature equipment (DPF muffler)
30 Protruding rib 31 Upper raised rib 32 Step part 50 Air scoop part 50a Drain piece part 51 Air circulation port 52 Perforated plate 53 Guide plate 53A Left guide plate part 53B Right guide plate part 53a Front end 53b Rear end 100 Air circulation device

Claims (6)

An air circulation device provided in a hood that covers an engine room that houses an engine supported by a vehicle body of a work vehicle and an engine accessory,
An air scoop portion provided on the upper panel of the bonnet and forming an air circulation port having an opening surface that opens toward the front of the vehicle body;
A perforated plate covering the air circulation port from the inside;
A guide plate provided above the engine high-temperature equipment below the air circulation port in order to guide the water droplets that have passed through the perforated plate to a water drop dropping allowable region in the engine room;
Equipped with a,
The guide plate is arranged so as to overlap with the entire front-rear direction of the air circulation port in the vertical direction,
The engine high-temperature equipment is arranged so that a part of the engine high-temperature equipment overlaps with the guide plate in the vertical direction and the remaining part of the engine high-temperature equipment does not overlap with the guide plate in the vertical direction. It has been that air flow device.   The air circulation device according to claim 1, wherein an opening surface of the air circulation port is inclined rearward of the vehicle body. The air circulation device according to claim 1 or 2, wherein the distance between the guide plate and the air circulation port is configured to increase from the front of the vehicle body toward the rear of the vehicle body .   The guide plate forms a right guide plate portion that forms an outflow passage that extends to the right while tilting downward from the center in the transverse direction of the engine room, and an outflow passage that extends to the left while tilting downward from the center in the transverse direction of the engine room. The air circulation device according to any one of claims 1 to 3, comprising a left guide plate portion.   The air circulation device according to claim 4, wherein the guide plate is arranged in an inclined posture in which a front end of the guide plate is lower than a rear end with respect to a vehicle body direction.   The air circulation device according to any one of claims 1 to 5, wherein a front edge portion of the air circulation port is formed as a draining piece portion protruding upward along an opening surface of the air circulation port.

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