JP2017088102A - Vehicular undercover structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular undercover structure which allows a vehicle equipped with a cabin and a deck to suppress wind from blowing up from an underfloor to improve aerodynamic performance.SOLUTION: A vehicular undercover 42, in a vehicle 10 in which a cabin 12 is arranged at an intermediate portion in a vehicle longitudinal direction and a deck 14 is arranged at a rear side in the vehicle of the cabin 12, comprises: a width-directional extended portion 44, extended along a vehicle width direction at a rear end side of the underfloor of the cabin 12 and provided at the rear end side of the underfloor so that a gap communicating in the vehicle longitudinal direction is not formed; and a longitudinal-directional extended portion 46, extended from the width-directional extended portion 44 to a front end side of the underfloor of the deck 16 and formed between the rear end part of the cabin 12 and the front end part of the deck 16, which covers a gap 40 communicating in a vehicle vertical direction from below the vehicle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle undercover structure.

  Conventionally, in a vehicle in which a cabin and a deck are connected, such as a pickup truck, the turbulent flow and negative pressure generated at the rear of the vehicle are reduced by covering the entire region or the rear region above the deck and turning the wind flow above the vehicle. Techniques for improving aerodynamic performance are known.

  For example, Patent Document 1 below discloses a vehicle bed structure for pulling out a tonneau cover housed inside a tailgate from a lower end portion of the tailgate and holding at least a rear upper portion of the deck. According to this structure, the wind flowing from the roof is prevented from entering the inside of the deck, and the redeposition of the wind flowing from the roof to the upper end of the tailgate is promoted. As a result, turbulence and negative pressure generated at the rear of the vehicle are reduced, and aerodynamic performance is improved.

JP 2009-113511 A

  However, according to the technique described in Patent Document 1, the wind flowing under the floor blows up from the gap between the cabin and the deck, and the wind flowing from the roof is pushed upward by the wind. For this reason, the wind flowing from the roof does not reattach to the tailgate upper end as intended, and the separated wind causes turbulence at the rear of the vehicle. As a result, negative pressure increases and aerodynamic performance deteriorates.

  In view of the above facts, an object of the present invention is to provide a vehicle undercover structure that can suppress blowing up from under the floor and improve aerodynamic performance in a vehicle including a cabin and a deck.

  The undercover structure for a vehicle according to the first aspect of the present invention is a vehicle in which a cabin is disposed at an intermediate portion in the vehicle front-rear direction and a deck is disposed on the vehicle rear side of the cabin. A width direction extending portion provided on the rear end side below the floor so as not to form a gap extending in the vehicle width direction on the end side in the vehicle width direction, and from the width direction extension portion. A front-rear direction extending portion that extends to the front end side below the floor of the deck, and that is formed between the rear end portion of the cabin and the front end portion of the deck and covers a gap extending in the vehicle vertical direction from the vehicle lower side; It has.

  According to the first aspect of the present invention, there is no vehicle between the rear end portion of the cabin disposed in the middle portion of the vehicle in the vehicle longitudinal direction and the front end portion of the deck disposed on the vehicle rear side of the cabin. A gap is formed in the vertical direction.

  Here, in the present invention, the vehicle undercover includes a width direction extending portion extending along the vehicle width direction on the rear end side under the floor of the cabin, and a front end under the floor of the deck from the width direction extending portion. A longitudinally extending portion that extends to the side. Of these, the extending portion in the width direction is provided on the rear end side under the floor so as not to form a gap extending in the vehicle front-rear direction. For this reason, when the vehicle travels, the traveling wind that flows under the cabin floor from the front side to the rear side in the vehicle front-rear direction flows to the vehicle rear side through the lower surface side of the width direction extending portion.

  The longitudinally extending portion covers a gap formed between the rear end portion of the cabin and the front end portion of the deck and extending in the vehicle vertical direction from the vehicle lower side. For this reason, the said running wind passes the vehicle lower side of the front-back direction extension part, and does not penetrate | invade into the clearance gap formed between the rear-end part of a cabin, and the front-end part of a deck.

  Therefore, the traveling wind blows up from the gap formed between the rear end portion of the cabin and the front end portion of the deck, and the wind flowing from the upper portion of the vehicle (roof) is suppressed from being pushed up. As a result, the wind flow from the rear end of the roof becomes smooth, the reattachment of the wind separated from the rear end of the roof to the rear end of the deck is promoted, and turbulence occurs at the rear side of the deck and negative pressure is generated. Occurrence is reduced.

  As described above, the undercover structure for a vehicle according to the first aspect of the present invention is excellent in that, in a vehicle including a cabin and a deck, blowing up from under the floor can be suppressed and aerodynamic performance can be improved. It has the effect.

1 is a side view of a vehicle to which a vehicle undercover structure according to an embodiment is applied. It is a top view of the part from the cabin of the vehicle shown in FIG. 1 to a deck. It is the longitudinal cross-sectional view (AA sectional view taken on the line of FIG. 2) which expands and shows the principal part of this embodiment. It is sectional drawing corresponding to FIG. 1 which shows the wind flow of the conventional vehicle which is not provided with the undercover structure for vehicles which concerns on this embodiment. FIG. 5 is a longitudinal sectional view corresponding to FIG. 3 showing the wind flow from under the floor in the case of the vehicle shown in FIG. 4.

  Hereinafter, an embodiment of a vehicle undercover structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

(Overall configuration of vehicle 10)
First, the overall configuration of the vehicle 10 will be described with reference to FIGS. As shown in FIG. 1, the vehicle 10 is configured to include a cabin 12 disposed in an intermediate portion in the vehicle front-rear direction and a deck 14 disposed adjacent to the vehicle rear side of the cabin 12. This is a so-called pickup truck. The cabin 12 and the deck 14 are respectively supported by a frame (not shown) formed in a ladder shape in plan view. Note that the cabin 12 is a portion serving as a passenger's living space, and the deck 14 is a portion on which luggage is loaded.

  The configurations of the cabin 12 and the deck 14 will be schematically described below. A floor panel 16 is disposed at the bottom of the cabin 12. A roof panel 18 is disposed on the top of the cabin 12, and a back panel 20 is disposed on the rear of the cabin 12. A windshield glass 28 is disposed at the front of the cabin 12.

  An engine room 24 is disposed at the front of the vehicle 10 in the vehicle front-rear direction. An engine hood 26 is disposed on the top of the engine room 24. The rear end portion of the engine hood 26 is disposed in the vicinity of the lower end portion of the windshield glass 28 described above.

  The deck 14 is formed in a box shape with the vehicle upper side open. Specifically, the deck 14 includes a bottom plate 32 formed in a rectangular flat plate shape. In addition, the deck 14 includes a pair of left and right side plates 34 that are provided at both ends of the bottom plate 32 in the vehicle width direction and extend in the vehicle front-rear direction, and a tailgate that is openable at the rear end portion of the bottom plate 32. 36 and a front plate 38 standing at the front end portion of the bottom plate 32.

  Note that the ladder-like frame that supports the cabin 12 and the deck 14 includes a pair of side members that extend in the vehicle front-rear direction and a plurality of cross members that are installed between the side members. The cabin 12 and the deck 14 are supported by the side member at a plurality of locations in a vibration-proof manner.

  As shown in FIGS. 2 and 3, a gap 40 is formed between the back panel 20 of the cabin 12 described above and the front plate 38 of the deck 14 so as to be pulled out in the vehicle vertical direction. The gap 40 is formed over the entire width of the deck 14 in the vehicle width direction. Further, the front-rear width of the gap 40 is slightly wider on the lower end side than on the upper end side.

(Detailed configuration of vehicle under cover structure)
Next, a detailed configuration of the vehicle undercover structure will be described with reference to FIGS. 2 and 3.

  As shown in FIGS. 2 and 3, the vehicle under cover 42 is formed in a rectangular flat plate shape in plan view. Further, the vehicle undercover 42 is disposed such that the short side faces the vehicle front-rear direction and the long side faces the vehicle width direction. Further, the vehicle under cover 42 is disposed over substantially the entire width of the cabin 12 and the deck 14.

  The vehicle undercover 42 extends to the rear end side under the floor of the cabin 12 along the vehicle width direction, and extends from the width direction extension portion 44 to the front end side under the floor of the deck 14. The front-rear direction extending portion 46 is included. The vehicle under cover 42 is formed of a thermoplastic resin as an example.

  The vehicle under cover 42 described above is attached to a cross member 48 disposed at the rear end portion of the floor panel 16 along the vehicle width direction. The structure of the cross member 48 will be briefly described. The cross member 48 is formed into a hat shape in cross section by pressing a steel plate, and has a length over the entire width of the floor panel 16. The cross member 48 includes a bottom wall portion 48A arranged in parallel to the floor panel 16, a pair of side wall portions 48B extending from the front and rear ends of the bottom wall portion 48A to the floor panel 16 side, and a pair of side members 48B. A pair of flange portions 48C extending in the vehicle front-rear direction from the upper end portion of the side wall portion 48B. In a state where the cross member 48 is joined to the floor panel 16, a closed cross section along the vehicle width direction is formed at the rear end portion of the floor panel 16. Thereby, the rear end side under the floor of the cabin 12 is highly rigid.

  And the width direction extension part 44 of the vehicle under cover 42 mentioned above is attached to the bottom wall part 48A of this cross member 48 in a surface contact state. In a state after the vehicle under cover 42 is attached to the vehicle body, the cross member 48 is disposed between the width direction extending portion 44 and the lower surface of the floor panel 16, and the gap between the two is closed. Moreover, since the width direction extension part 44 is being fixed to the bottom wall part 48A in the surface contact state, a clearance gap is not formed between both. Accordingly, there is no gap formed between the vehicle under cover 42 and the rear end side under the floor in the vehicle front-rear direction (it does not occur).

  A longitudinally extending portion 46 is integrally formed on the vehicle rear side of the widthwise extending portion 44 described above. The front / rear direction extending portion 46 extends from the width direction extending portion 44 toward the vehicle rear side from the front end side under the floor of the deck 14 (the front end side of the bottom plate 32). In other words, the horizontal portion 46 </ b> B extends to a position overhanging the front end portion of the bottom plate 32 of the deck 14. Further, the front-rear direction extending portion 46 extends horizontally from the rear end of the width-direction extending portion 44 to the vehicle rear and downward, and horizontally extends from the rear end of the inclined portion 46A to the vehicle rear side. And a horizontal portion 46B that is provided. Note that the lower surface of the connecting portion between the inclined portion 46A and the horizontal portion 46B is formed with a gently curved surface that protrudes downward in the vehicle, and smoothly rectifies the flow of traveling wind under the floor. Further, the rear end portion of the horizontal portion 46B is a free end.

  In the state in which the vehicle under cover 42 is attached, the vehicle is formed between the rear end portion (back panel 20) of the cabin 12 and the front end portion (front standing plate 38) of the deck 14 by the front-rear extending portion 46. The above-described gap 40 that passes through in the vehicle vertical direction is covered from the vehicle lower side.

(Function and effect)
Next, operations and effects of the vehicle undercover structure according to the present embodiment will be described in comparison with the conventional structure.

  FIG. 4 shows a wind flow of a conventional vehicle 100 that does not include the vehicle undercover 42 according to the present embodiment in a side view. As shown in this figure, when the vehicle 100 travels on the road surface 50, the traveling wind that collides with the front end of the vehicle 100 flows into the upper surface side of the roof panel 18 through the upper surface side of the engine hood 26 and the windshield glass 28. The driving wind P is branched into the driving wind P and the driving wind Q flowing into the vehicle lower side (under the floor) of the engine room 24.

  Here, as shown in FIGS. 4 and 5, in the case of the vehicle 100, a gap 40 is formed between the rear end portion of the cabin 12 and the front end portion of the deck 14 in the vehicle vertical direction. For this reason, the traveling wind Q that has flowed under the floor of the engine room 24 is branched into the traveling wind Q1 that flows into the gap 40 at the rear end of the cabin 12 and the traveling wind Q2 that flows into the floor under the deck 14. The traveling wind Q1 flowing into the gap 40 is blown up along the back panel 20 of the cabin 12 and interferes with the traveling wind P peeled off from the rear end portion of the roof panel 18. As a result, the traveling wind P is pushed upward, and the downstream Pr of the traveling wind P does not reattach to the upper end of the tail gate 36 of the deck 14 but flows past the tail gate 36 toward the rear of the vehicle. . As a result, a turbulent flow R is generated on the vehicle rear side (rear side) of the tailgate 36, and accordingly, there is a concern that negative pressure is generated and aerodynamic performance is deteriorated.

  On the other hand, in the case of the vehicle 10 to which the vehicle undercover 42 according to the present embodiment is applied, the vehicle including the width direction extending portion 44 and the front and rear direction extending portion 46 on the rear end side under the floor of the cabin 12. An under cover 42 is provided. Among these, the width direction extension part 44 is provided in the rear-end side under the said floor so that the clearance gap through the vehicle front-back direction is not formed. For this reason, during traveling of the vehicle, the traveling wind Q flowing under the floor of the cabin 12 from the front side in the vehicle front-rear direction to the rear side flows through the lower surface side of the width direction extending portion 44 toward the vehicle rear side.

  Further, the front-rear direction extending portion 46 is formed between the rear end portion of the cabin 12 and the front end portion of the deck 14 and covers a gap 40 that extends in the vehicle vertical direction from the vehicle lower side. For this reason, the traveling wind Q passes through the lower surface side of the longitudinally extending portion 46 and does not enter the gap 40 formed between the rear end portion of the cabin 12 and the front end portion of the deck 14.

  Therefore, the traveling wind Q is prevented from blowing up from the gap 40 formed between the rear end portion of the cabin 12 and the front end portion of the deck 14 and the traveling wind P is pushed up. As a result, the wind flow from the rear end of the roof panel 18 becomes smooth, and the reattachment of the downstream Pr of the traveling wind P to the rear end (the upper end portion of the tailgate 36) of the deck 14 is promoted. Generation of turbulent flow and negative pressure on the rear side is reduced. As a result, according to the present embodiment, in the vehicle 10 including the cabin 12 and the deck 14, it is possible to suppress blowing up from under the floor and improve aerodynamic performance.

  As described above, the vehicle undercover 42 according to the present embodiment can suppress a blow-up from under the floor and improve the aerodynamic performance in the vehicle 10 including the cabin 12 and the deck 14.

<Supplementary explanation of this embodiment>
In the present embodiment, the vehicle under cover 42 is attached to the cross member 48 disposed at the rear end of the floor panel 16. However, the present invention is not limited to this, and the vehicle under cover 42 may be attached to the floor panel 16. Good.

  Further, in the present embodiment, the vehicle under cover 42 is configured to be disposed over substantially the entire width of the deck 14, but this is not a limitation, and the dimension along the vehicle width direction may be slightly shorter, Even in that case, an effect corresponding to the length can be obtained.

DESCRIPTION OF SYMBOLS 10 Vehicle 12 Cabin 14 Deck 40 Clearance 42 Vehicle under cover 44 Width direction extension part 46 Front-back direction extension part

Claims (1)

In a vehicle in which a cabin is disposed in an intermediate portion in the vehicle front-rear direction and a deck is disposed on the vehicle rear side of the cabin, the vehicle extends along the vehicle width direction on the rear end side under the floor of the cabin. A width direction extending portion provided on the rear end side under the floor so that a gap extending in the front-rear direction is not formed,
A gap extending from the width direction extending portion to the front end side under the floor of the deck and formed between the rear end portion of the cabin and the front end portion of the deck and extending in the vehicle vertical direction is covered from the vehicle lower side. A longitudinally extending portion;
Undercover structure for vehicles with

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