JP2017202763A - Vehicle rear structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit generation of a swirl flow due to a travel wind flowing on a side of a vehicle to reduce travel resistance.SOLUTION: In a vehicle rear structure, right and left cab rear surface openings 40 are provided in an outer end part on an outer side in a vehicle width direction at a rear surface of a cab 2 and opened rearward and upward from a top face of a loading space 20. A first vent pipe 42 includes: right and left first rear end parts 43 respectively communicated to the right and left cab rear surface openings 40; and a first front end part 44 opened downward in a vehicle body lower part that is positioned forward of the right and left cab rear surface openings 40, and extends obliquely rear-upward and toward the first rear end parts 43 from the first front end part 44.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rear structure of a vehicle.

  Patent Document 1 describes a structure in which a freight vehicle having a loading platform behind a cab is provided with a rectifying plate that protrudes rearward in the vehicle body front-rear direction from the rear surface of the cab. The rectifying plate extends in the vehicle width direction with the front end of the upper surface approaching the rear end of the roof above the cab, and the upper surface of the rectifying plate is directed rearward in the vehicle width direction by the action of the upper surface of the rectifying plate. The traveling wind that has spread and flowed can flow away from the rear surface of the vehicle. For this reason, generation | occurrence | production of the vortex | eddy_current which wraps around to the lower rear side of a vehicle can be suppressed, negative pressure can be prevented, and increase in running resistance can be suppressed.

JP 2012-245828 A

  In addition to the traveling wind that flows from the upper surface of the roof to the rear of the cab, the traveling wind that flows from the side of the cab to the rear of the cab and the side of the loading platform to the rear of the loading platform A flowing running wind is generated. If the traveling wind that flows on the side of the cab wraps around inward in the vehicle width direction behind the cab, or the traveling wind that flows in the side of the loading platform wraps inward in the vehicle width direction behind the loading platform, the rear of the cab or behind the loading platform In this case, eddy currents are generated and running resistance increases due to negative pressure.

  With the structure of Patent Document 1, it is possible to suppress the generation of eddy currents due to traveling wind flowing over the cab, but it is not possible to suppress the generation of eddy currents due to traveling wind flowing on the side of the vehicle.

  Therefore, an object of the present invention is to provide a rear structure of a vehicle that can reduce the running resistance by suppressing the generation of eddy currents caused by the running wind flowing on the side of the vehicle.

  In order to achieve the above object, the present invention provides a rear structure of a vehicle in which the upper surface of a loading platform mounted at the rear of the cab is lower than the upper surface of the cab, a pair of left and right cab rear surface openings, a first vent pipe, Is provided. The left and right cab rear surface openings are provided at the outer end of the rear surface of the cab on the outer side in the vehicle width direction, and open rearward above the upper surface of the loading platform. The first vent pipe has left and right first rear end portions respectively communicating with left and right cab rear surface openings, and a first front end portion opened downward at a lower part of the vehicle body in front of the left and right cab rear surface openings. It extends obliquely rearward and upward from the front end toward the first rear end.

  In the above configuration, a part of the traveling wind flowing under the vehicle body flows into the first front end portion of the first vent pipe while traveling through the vehicle, flows through the first vent pipe, and flows out from the cab rear surface opening. Jets backward from the outer end of the rear surface of the vehicle width direction outside. In this way, the cab rear surface opening functions like a jet nozzle, and a high-speed air flow is generated from the outer end portion of the cab rearward toward the rear, so that the traveling wind flowing along the side of the cab is rearward of the cab. The wraparound is suppressed. Accordingly, it is possible to reduce the running resistance by suppressing the generation of vortex behind the cab due to the running wind flowing on the side of the cab.

  A second aspect of the present invention is a rear structure of a vehicle in which a loading platform is mounted on the rear side of the cab, and includes a pair of left and right loading platform rear surface openings and a second ventilation pipe. The left and right cargo bed rear surface openings are provided at outer end portions on the outer side in the vehicle width direction of the rear surface of the cargo bed and open rearward. The second vent pipe has left and right second rear end portions communicating with the left and right cargo bed rear surface openings, and a second front end portion opened downward at a lower part of the vehicle body in front of the left and right cargo bed rear surface openings. Extends rearward from the portion toward the second rear end portion.

  In the above configuration, during traveling of the vehicle, a part of the traveling wind flowing below the vehicle body flows into the second front end portion of the second ventilation pipe, flows through the second ventilation pipe, and flows out from the opening on the rear surface of the loading platform. Jets backward from the outer end of the rear surface of the vehicle width direction outside. In this way, the opening on the rear surface of the loading platform functions like a jet nozzle, and a high-speed air flow is generated from the outer end of the rear surface of the loading platform toward the rear, so that the traveling wind that flows along the side surface of the loading platform moves to the rear of the loading platform. The wraparound is suppressed. Accordingly, it is possible to reduce the running resistance by suppressing the generation of vortex behind the loading platform due to the traveling wind flowing on the side of the loading platform.

  A third aspect of the present invention is the rear structure of the vehicle according to the second aspect, and includes a fender opening penetrating the fender in a rear region of the fender that defines a wheel house in which a tire is accommodated. The second front end portion of the second vent pipe opens to the lower part of the vehicle body by communicating with the fender opening.

  In the above configuration, the traveling wind that has flowed into the wheel house during vehicle travel flows from the fender opening to the second front end of the second vent pipe, circulates through the second vent pipe, and then the loading platform from the second rear end. It flows out through the rear opening. Accordingly, the air resistance can be reduced by smoothly flowing out the traveling wind flowing into the wheel house while the vehicle is traveling.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the eddy current resulting from the driving | running | working wind which flows the side of a vehicle can be suppressed, and driving | running resistance can be reduced.

1 is a rear view of a vehicle according to an embodiment of the present invention. It is the perspective view which looked at the front part of the vehicle of FIG. 1 from diagonally downward. It is principal part sectional drawing which looked at the front part of the vehicle of FIG. 1 from the side. It is the perspective view which looked at the fender of FIG. 1 from diagonally upward. It is principal part sectional drawing which looked at the rear part of the vehicle of FIG. 1 from the side. It is VI-VI arrow sectional drawing of FIG.

  Hereinafter, a rear structure of a vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the front-rear direction is the front-rear direction of the traveling direction of the vehicle, and the left-right direction is the left-right direction when facing the front of the vehicle. In the figure, an arrow FR indicates the front, an arrow UP indicates the upper side, and an arrow IN indicates the inner side in the vehicle width direction.

  As shown in FIGS. 1 to 3, the vehicle 1 according to the present embodiment is a freight vehicle such as a pickup truck, for example, and includes a cab 2 and a loading platform 20 mounted on the rear side of the cab 2. Both sides of the cab 2 in the vehicle width direction are partitioned by a cab side panel (including the vehicle door 4) 3 erected along the front-rear direction, and the rear side of the cab 2 is erected along the vehicle width direction. It is defined by the cab back panel 5, and the upper side of the cab 2 is defined by the roof panel 6 that intersects with the vertical direction. The outer surface (the vehicle lateral direction outer surface) of the cab side panel 3 forms a side surface (cab side surface) 7 of the cab 2, and the outer surface (rear surface) of the cab back panel 5 forms a rear surface (cab rear surface) 8 of the cab 2. The outer surface (upper surface) of the roof panel 6 forms the upper surface (cab upper surface) 9 of the cab 2.

  The loading platform 20 includes a floor 21, a loading platform front wall 22, a pair of left and right loading platform side walls 23, a tailgate 24, and the like. The loading platform front wall 22, loading platform side wall 23, and tailgate 24 are all formed in a closed cross-sectional shape by a panel material (for example, an inner panel and an outer panel).

  The loading platform front wall 22 is disposed so as to face the cab rear surface 8 and partitions the front end of the loading platform 20. The loading platform side wall 23 is erected along the vehicle front-rear direction from both ends of the loading platform front wall 22 in the vehicle width direction. The upper side of the loading platform 20 is opened, and the upper surface 25 of the loading platform side wall 23 is lower than the cab upper surface 9. The tailgate 24 stands up along the vehicle width direction between the rear end portions of the left and right cargo bed side walls 23 and partitions the rear end of the cargo bed 20. The lower end portion of the tailgate 24 is rotatably connected to the rear end portion of the floor 21, and opens and closes between a standing closed position and an open position that extends substantially horizontally rearward from the rear end of the floor 21. Note that the cab back panel 5 and the loading platform front wall 22 may be integrally formed. Further, the upper part of the loading platform 20 may be closed by a cover panel (not shown) or the like.

  Both sides in the vehicle width direction of the engine room (not shown) in front of the cab 2 are partitioned by the front side panel 10, and the front side panel 10, the cab side panel 3, and the cargo bed side wall 23 stand up side by side in the front-rear direction. The side part 12 is configured. The left and right front side panels 10 are each provided with a front fender 30 for a front wheel (front tire) 60 and fixed to the vehicle body side. Rear fenders 31 for the rear wheels (rear tires) 61 are provided on the cargo bed side wall 23 and fixed to the vehicle body side. The front and rear fenders 30 and 31 have the same basic configuration except for the presence or absence of a fender opening 51 to be described later. Therefore, the rear fender 31 will be described below, and the description of the front fender 30 will be omitted.

  As shown in FIGS. 4 to 6, the fender 31 includes a plate-shaped fender body 32 that is curved in an arch shape, a plate-shaped fender inner 33 that stands up in the vehicle width direction inside the fender body 32, and a fender. It has integrally the front and rear flange portions 34 that bend in the front-rear direction from both ends of the main body 32. The fender body 32 defines the upper side of the wheel house 35 in which the tire 61 is accommodated, and the fender inner 33 defines the inner side in the vehicle width direction of the wheel house 35. The upper side of the tread surface 61 a of the tire 61 faces the fender body 32, and the upper part of the inner side surface 61 b in the vehicle width direction of the tire 61 faces the fender inner 33. The lower end portion of the fender inner 33 and the front and rear flange portions 34 are fixed to the vehicle body side (in the rear fender 31, the upper surface of the lower surface panel portion 27 of the cargo bed side wall 23).

  As shown in FIGS. 1 to 3, a pair of left and right cab rear surface openings 40 that open rearward are formed on both sides of the cab rear surface 8 in the vehicle width direction. The cab rear surface opening 40 has a rectangular shape and penetrates the cab back panel 5 in the front-rear direction at a predetermined height position spaced upward from the front ends of the left and right cargo bed side walls 23. A pair of left and right under openings 41 is formed in the under panel 11 at the front lower side of the cab rear surface opening 40. The under panel 11 is fixed to the vehicle body side in a posture (for example, substantially horizontal) intersecting with the vertical direction, and covers substantially the entire bottom surface of the vehicle 1 in front of the loading platform 20 from below. The under opening 41 has a rectangular shape and penetrates the under panel 11 in the vertical direction between the front and rear wheel houses 35.

  As shown in FIG. 3, a pair of left and right first ventilation pipes 42 are disposed between the cab back panel 5 and the under panel 11 and fixed to the vehicle body side. The left first vent pipe 42 has a first rear end portion 43 communicating with the left cab rear surface opening 40 and a first front end portion 44 communicating with the left under opening 41. Similarly, the right first vent pipe 42 has a first rear end portion 43 that communicates with the right cab rear surface opening 40 and a first front end portion 44 that communicates with the right under opening 41. Each first vent pipe 42 divides a first vent path 45 having a rectangular cross section inside, and linearly extends obliquely rearward and upward from the first front end 44 toward the first rear end 43. In the present embodiment, the first rear end portion 43 is fixed in a state of being in close contact with the inner surface (front surface) of the cab back panel 5, and the first front end portion 44 is fixed in a state of being in close contact with the upper surface of the under panel 11. The first rear end portion 43 and / or the first front end portion 44 may be fixed to the vehicle body side without fixing the first rear end portion 43 and / or the first front end portion 44 to the vehicle body side.

  Thus, the left and right cab rear surface openings 40 that open rearward above the upper surface of the loading platform 20 (the upper surface 25 of the loading platform side wall 23) are provided at the outer end of the cab rear surface 8 on the outer side in the vehicle width direction. . The left and right first vent pipes 42 each have a first rear end portion 43 that communicates with the cab rear surface opening 40 and a first front end portion 44 that opens downward at the lower part of the vehicle body in front of the cab rear surface opening 40. The first front end 44 extends obliquely rearward and upward toward the first rear end 43.

  As shown in FIGS. 1, 5, and 6, the rear surface 26 of the left and right loading platform side walls 23 is formed with a rectangular loading platform rear surface opening 50 that opens rearward behind the fender opening 51. The loading platform rear surface opening 50 penetrates the rear panel 28 of the loading platform side wall 23 in the front-rear direction.

  As shown in FIGS. 4 to 6, a rectangular fender opening penetrating the fender main body 32 is provided in the rear region (region from the top of the arch shape) 32 a of the fender main body 32 of the left and right rear fenders 31. 51 are formed. The fender opening 51 is arranged to be offset inward in the vehicle width direction from a region facing the rear surface (rear tread surface 61a) of the tire 61 facing the straight traveling direction in the rear region 32a of the fender main body 32. 32 extends rearward and downward toward the rear flange 34. Note that no fender opening is formed in the fender body of the front fender 30.

Between the rear panel 28 of the left and right cargo bed side walls 23 and the fender body 32 of the left and right fenders 31 on the rear side, left and right second ventilation pipes 52 are respectively arranged and fixed to the vehicle body side. The left second vent pipe 52 has a second rear end portion 53 that communicates with the left cargo bed rear surface opening 50 and a second front end portion 54 that communicates with the left fender opening 51. Similarly, the right second vent pipe 52 has a second rear end portion 53 that communicates with the right cargo bed rear surface opening 50 and a second front end portion 54 that communicates with the right fender opening 51. Each of the second vent pipes 52 divides a second vent path 55 having a rectangular cross section inside, and is inserted into the inside of the cargo bed side wall 23 from the second front end portion 54 toward the first rear end portion 43 to be linear. Extends backward. In the present embodiment, the second rear end portion 53 is fixed in a state of being in close contact with the inner surface (front surface) of the rear panel portion 28, and the second front end portion 54 is fixed in a state of being in close contact with the outer surface of the fender body 32. The second rear end portion 53 and / or the second front end portion 54 may not be fixed to the vehicle body side, and the intermediate portion of the second vent pipe 52 may be fixed to the vehicle body side. Left and right cargo bed rear surface openings 50 that open rearward are provided at outer ends (the rear surfaces 26 of the left and right cargo bed side walls 23) on the outer side in the vehicle width direction. The left and right second ventilation pipes 52 each have a second rear end portion 53 that communicates with the cargo bed rear surface opening 50 and a second front end portion 54 that opens downward at the lower part of the vehicle body in front of the cargo bed rear surface opening 50. 2 extends rearward from the front end 54 toward the second rear end 53.

  According to the present embodiment, during traveling of the vehicle, a part of the traveling wind that flows below the vehicle body flows into the first front end portion 44 of the first ventilation pipe 42 and flows through the first ventilation path 45 to rearward the cab. It flows out from the opening 40 and is ejected rearward from the outer end of the cab rear surface 8 on the outer side in the vehicle width direction. Thus, the cab rear surface opening 40 functions like a jet nozzle, and a high-speed air flow is generated from the outer end portion of the cab rear surface 8 toward the rear, so that the cab 2 of the traveling wind that flows along the cab side surface 7 is formed. Wrapping back is suppressed. Accordingly, it is possible to reduce the running resistance by suppressing the generation of vortex behind the cab 2 due to the running wind flowing on the side of the cab 2.

  Further, a part of the traveling wind flowing below the vehicle body flows into the second front end portion 54 of the second ventilation pipe 52 from the fender opening 51 of the rear fender 31, flows through the second ventilation path 55, and the rear surface of the loading platform. The fuel flows out from the opening 50 and is ejected rearward from the outer end of the rear surface of the loading platform 20 on the outer side in the vehicle width direction. Thus, the opening 50 on the rear surface of the loading platform functions like a jet nozzle, and a high-speed air flow is generated from the rear end of the rear surface of the loading platform 20 toward the rear, so that the side surface of the loading platform 20 (the outer surface of the loading platform side wall 23). Is prevented from wrapping around the carrier 20 of the traveling wind flowing along. Accordingly, it is possible to reduce the running resistance by suppressing the generation of vortex behind the loading platform 20 due to the traveling wind flowing on the side of the loading platform 20.

  Furthermore, the traveling wind that has flowed into the wheel house 35 flows into the second front end portion 54 of the second ventilation pipe 52 from the fender opening 51, flows through the second ventilation path 55, and flows out from the loading platform rear surface opening 50. The running wind flowing into the wheel house 35 during the traveling of the vehicle can smoothly flow out of the wheel house 35 to reduce the air resistance.

  Next, a decrease in air resistance experienced by the vehicle 1 having the cab rear surface opening 40, the first vent pipe 42, the cargo bed rear surface opening 50, and the second vent pipe 52 will be described based on a verification result using wind tunnel analysis.

  In this wind tunnel analysis, an up-down direction length (height) of 3.2 m and a vehicle width direction length of 10 m is formed on a computer by constructing a wind tunnel on a computer in which a cross-sectional air region extends 33 m in the front-rear direction. The vehicle traveling at 100 km / h is received from the front in the traveling direction by arranging the vehicle in the center of the wind tunnel with the front part of the vehicle facing the direction of the wind tunnel entrance and flowing an air flow at 100 km / h from the wind tunnel entrance. The air resistance is calculated. The air resistance experienced by a vehicle is measured by the pressure loss, which is the pressure difference between the pressure at the wind tunnel inlet and the pressure at the wind tunnel outlet.

  First, an analysis model of a vehicle that does not have the cab rear surface opening 40, the first vent pipe 42, the cargo bed rear surface opening 50, and the second vent pipe 52 is arranged in the wind tunnel, and an air flow of 100 km / h is introduced from the wind tunnel entrance. Analysis was performed.

  Next, an analysis model of the vehicle 1 having the cab rear surface opening 40, the first ventilation pipe 42, the cargo bed rear surface opening 50, and the second ventilation pipe 52 according to the present embodiment is arranged in the wind tunnel, and air at 100 km / h from the wind tunnel entrance. Analysis was performed with a flow inflow.

  As a result of analysis, in the vehicle 1 having the cab rear surface opening 40, the first ventilation pipe 42, the cargo bed rear surface opening 50, and the second ventilation pipe 52 according to the present embodiment, the cab rear surface opening 40, the first ventilation pipe 42, and the cargo bed rear surface opening. It is confirmed that the air resistance (pressure loss) is reduced by about 1.74% as compared with a vehicle having no 50 and the second vent pipe 52, and the air resistance received by the vehicle 1 is reduced to the cab rear surface opening 40, the first vent pipe. 42, it was verified that the load can be effectively reduced by the rear loading opening 50 and the second ventilation pipe 52.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said embodiment, Of course, in the range which does not deviate from this invention, an appropriate change is possible. . That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  For example, in the above-described embodiment, both the cab rear surface opening 40 and the first vent pipe 42 and the cargo bed rear surface opening 50 and the second vent pipe 52 are provided, but the cab rear surface opening 40 and the first vent pipe 42 or the cargo bed are provided. Either the rear opening 50 or the second vent pipe 52 may be provided.

  Further, although the two left and right under openings 41 are provided, the under opening may be one, and the first vent pipe may be branched left and right and connected to the two cab rear surface openings 40. Further, instead of the fender openings, left and right openings (second under openings) may be formed in the under panel 11. In this case, the second under opening may be one place, and the second vent pipe may be branched left and right and connected to the two rear loading openings 50 on the loading platform.

  The present invention can be applied to various vehicles in which a loading platform is mounted behind the cab.

1: Vehicle (cargo vehicle)
2: Cab 3: Cab side panel 4: Vehicle door 5: Cab back panel 6: Roof panel 7: Side of cab (cab side)
8: Rear side of cab (back side of cab)
9: Upper surface of cab (cab upper surface)
10: Front side panel 11: Under panel 20: Loading platform 21: Floor 22: Loading platform front wall 23: Loading platform side wall 24: Tail gate 25: Upper surface of loading platform side wall 26: Rear surface of loading platform side wall Outer edge)
27: Lower side panel portion 28 of the loading platform side wall: Rear panel portion 30 of the loading platform side wall: Fender 31 on the front side: Fender 32 on the rear side: Fender body 33: Fender inner 34: Flange portion 35: Wheel house 40: Rear opening on the cab 41: Under opening 42: 1st ventilation pipe 43: 1st rear end part 44: 1st front end part 45: 1st ventilation path 50: Loading platform rear surface opening 51: Fender opening 52: 2nd ventilation pipe 53: 2nd rear end part 54 : Second front end 55: Second air passage 60: Front wheel (front tire)
61: Rear wheel (rear tire)

Claims (3)

The rear structure of the vehicle is such that the upper surface of the loading platform mounted behind the cab is lower than the upper surface of the cab,
A pair of left and right cab rear surface openings provided at an outer end portion of the rear surface of the cab on the outer side in the vehicle width direction and opening rearward above the upper surface of the cargo bed;
Left and right first rear end portions communicating with the left and right cab rear surface openings, respectively, and a first front end portion opened downward at a lower part of the vehicle body in front of the left and right cab rear surface openings, from the first front end portion And a first vent pipe extending obliquely rearward and upward toward the first rear end portion. A rear structure of a vehicle with a loading platform mounted behind the cab,
A pair of left and right cargo bed rear surface openings provided at the outer end of the rear surface of the cargo bed in the vehicle width direction and opening rearward;
Left and right second rear end portions communicating with the left and right cargo bed rear surface openings, and a second front end portion opened downward at a lower part of the vehicle body in front of the left and right cargo bed rear surface openings, and from the second front end portion, And a second vent pipe extending rearward toward the second rear end portion. The vehicle rear structure according to claim 2,
A fender opening penetrating the fender in the rear region of the fender defining a wheel house in which the tire is housed,
The rear structure of the vehicle, wherein the second front end portion of the second ventilation pipe opens to a lower portion of the lower portion of the vehicle body by communicating with the fender opening.

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