JP2013132997A - Rear spoiler device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear spoiler device for a vehicle, capable of suppressing increase of pneumatic resistance, and reducing negative pressure on the vehicle rear surface.SOLUTION: The rear spoiler device 1 which is installed on the rear side of a roof 4 in the vehicle 3, has an inner wall 13 forming an air passage 10 between a rear window glass 5 and the inner wall in the vehicle 3, passes a part of an airflow AF1 moving rearward along the upper surface 4b of the roof 4 during running through the air passage 10 to make it an airflow AF2 heading toward the rear window glass 5. The inner wall 13 is configured to gradually widen the air passage 10 so that a distance L2 of a flow outlet 15 at the rear window glass 5 side in the air passage 10 is greater than a distance L1 of a flow inlet port 14 at the roof 4 side.

Description

  The present invention relates to a rear spoiler device for a vehicle, and more particularly to a rear spoiler device having a function of preventing water droplets or the like from adhering to a rear window glass.

  Conventionally, various rear spoiler devices for vehicles have been proposed. For example, in Patent Document 1, the air flow path is gradually narrowed so that the outflow width becomes smaller than the inflow width, and the velocity (flow velocity) of the airflow passing through the air flow path is increased to the rear window glass. is there. As a result, water droplets and the like adhering to the rear window glass are blown away by the air flow having an increased flow velocity. Or it becomes difficult to adhere by the air curtain effect, and the cleaning effect of the rear window glass is exhibited (for example, refer to Patent Document 1).

JP 2002-2553 A

  However, in the vehicle rear spoiler device of Patent Document 1, in order to improve the cleaning effect, it is necessary to increase the flow velocity of the airflow, which leads to an increase in air resistance. In addition, the derivation of the air flow having a high flow velocity increases the negative pressure on the rear surface of the vehicle. When the negative pressure increases, the airflow from the side of the vehicle increases and entrainment may cause water droplets and the like to adhere to the rear window glass.

  The present invention has been made in view of the above problems, and an object of the present invention is to suppress an increase in air resistance and reduce the negative pressure on the rear surface of the vehicle.

  According to a first aspect of the present invention, there is provided a wall surface which is installed on a rear side of a roof in a vehicle and forms an air flow path with a rear window glass in the vehicle, and the roof surface of the roof during traveling A rear spoiler device for a vehicle, wherein a part of the airflow moving rearward along the air flow path passes through the air flow path and descends toward the rear window glass, wherein the wall surface is the rear flow path in the air flow path. In this configuration, the air flow path is formed to be gradually widened so that the outflow width of the wind glass side outlet becomes larger than the inflow width of the roof side inlet in the air flow path.

  Here, “to gradually widen” does not only mean that the air flow path is gradually widened from the inlet to the entire outlet, but the wall surface so that a part of the air flow path is gradually widened. It is also included that formed.

  With this configuration, in the vehicle rear spoiler device, the width of the air flow path formed between the vehicle rear spoiler device and the rear window glass is gradually increased from the inlet to the outlet to increase the negative pressure in the air flow channel. As a result, air can be easily taken into the air flow path without causing an increase in air resistance. As a result, a large amount of air taken in can be directed to the rear window glass, the negative pressure at the rear of the vehicle can be reduced, and the adhesion of water droplets and the like caused by airflow from the side of the vehicle or entrainment can be suppressed. Can be improved.

  The second problem solving means of the present invention is such that the ratio between the inflow width and the outflow width is a ratio that causes a diffuser effect in the downflow in the air flow path.

  With this configuration, a diffuser effect can be produced in the downflow in the air flow path, air can be easily taken in, and the negative pressure on the rear surface of the vehicle can be reduced, thereby providing a vehicle rear spoiler device.

  The third problem-solving means of the present invention is configured such that the ratio of the inflow width to the outflow width is approximately 11:14.

  With this configuration, an air flow that can suppress an increase in air resistance and reduce the negative pressure on the rear surface of the vehicle can be more reliably formed in the air flow path.

  According to a fourth aspect of the present invention, there is provided a top surface for branching the air flow separately from the downward flow and moving the air flow backward, and the upper surface gradually becomes lower than the roof surface as it goes rearward. It is.

  With this configuration, a branched airflow separate from the downflow flows along the upper surface that gradually becomes lower than the roof surface. Thereby, the airflow flows downward in the vehicle, and the negative pressure on the rear surface of the vehicle can be reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to suppress an increase in air resistance and reduce the negative pressure on the rear surface of the vehicle.

The perspective view which looked at the rear spoiler from the lower side. AA sectional view showing an embodiment of the present invention. The figure which shows the relationship between the setting dimension of the inflow port of an air flow path, and an outflow port, Cd value, and a vehicle speed ratio.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a perspective view of a rear spoiler device 1 (vehicle rear spoiler device) viewed from below. The rear spoiler 2 is disposed on the rear side of the roof 4 in the vehicle 3 and is mounted for the purpose of improving the running stability of the vehicle 3, improving fuel consumption, and improving the design of the vehicle 3. The rear spoiler 2 extends over the entire left and right direction of the vehicle 3 and has mounting pieces 6 and 7 extending forward and obliquely downward in the left and right direction. The rear spoiler 2 is attached to the upper end of the vehicle rear surface 8 by the attachment pieces 6 and 7. An air flow path 10 is formed between the rear spoiler 2 and the rear window glass 5, and is formed over the entire left and right direction of the vehicle 3. The air flow path 10 may be formed between the rear spoiler 2 and the upper end of the vehicle rear surface 8. Moreover, the air flow path 10 may be formed over the whole left-right direction of the rear window glass 5, and may be formed in a part in the left-right direction of a vehicle.

  FIG. 2 is a cross-sectional view taken along line AA of the vehicle 3 including the rear spoiler 2. As shown in FIG. 2, the rear spoiler 2 includes an upper wall portion 11, a lower wall portion 12, and an inner wall portion 13. More specifically, the rear spoiler 2 is provided with an inner wall portion 13 (wall surface) that forms an air passage 10 between the vehicle 3 and the rear window glass 5. The inner wall portion 13 faces the rear end 4a of the roof 4, the vehicle rear surface 8, and the rear window glass 5, and extends downward along the roof. The upper end 13a of the inner wall portion 13 is formed at a position higher than the roof 4 in the vertical direction, and is formed at a position of a distance d with the upper surface 4b (roof surface) of the roof 4 as the reference plane F. Moreover, the upper wall part 11 (upper surface) extended diagonally downward as it goes back from the upper end 13a of the inner wall part 13 is formed. The upper wall portion 11 is provided with a dimension inclined at an angle R downward from the reference surface F of the roof 4. The angle R is an elevation angle of 10 ° to 13 °. Moreover, the lower wall part 12 extended diagonally upward as it goes back from the lower end 13b of the inner wall part 13 is formed. Note that the upper end 13a of the inner wall portion 13 may be formed at the position of the reference surface F that is the same height as the upper surface 4b of the roof in the vertical direction.

  The air flow path 10 is formed with an inlet 14 (inlet) through which air flows in and an outlet 15 (outlet) through which air flows out. The inflow port 14 is formed between the upper end 13a of the inner wall portion 13 and the rear end 4a of the roof 4 with a distance L1 (inflow width). That is, the inflow port 14 is formed on the roof 4 side of the air flow path 10. The outlet 15 is formed between the lower end 13b of the inner wall 13 and the rear window glass 5 with a distance L2 (outflow width). Note that the outlet 15 may be formed between the lower end 13 b of the inner wall portion 13 and the vehicle rear surface 8. That is, the outlet 15 is formed on the rear window glass 5 side of the air flow path 10. And the inner wall part 13 is provided in order to make the air flow path 10 wide gradually so that the distance L2 of the inflow port 15 may become larger than the distance L1 of the inflow port 14. More specifically, the inner wall portion 13 extends in such a manner that the distance L from the rear end 4a of the roof 4 or the rear window glass 5 gradually increases as it goes downward. In addition, the inner wall part 13 may have a shape in which the distance L is constant from the upper end part 13a downward.

  Further, as the vehicle 3 travels, an airflow directed backward is generated around the vehicle 3, and an airflow AF 1 that moves rearward along the upper surface 4 b of the roof 4 is formed on the roof 4. A part of the airflow AF1 flows into the airflow AF2 (downflow) that flows in from the inlet 14 of the air flow path 10, passes through the air flow path 10, and flows out from the outlet 15. That is, the airflow AF2 is a downward flow that passes through the air flow path 10 and moves toward the rear window glass 5. Further, the upper wall portion 11 forms an airflow AF3 that branches the airflow AF1 separately from the airflow AF2 and moves the airflow AF1 rearward of the vehicle 3. The airflow AF3 flows along the upper wall portion 11 and flows to the lower side of the vehicle 3 behind the rear end 11a of the upper wall portion 11.

  FIG. 3 shows the relationship between the set dimension of the distance L1 of the inlet 14 and the distance L2 of the outlet 15 in the air flow path 10, the Cd value, and the vehicle speed ratio (ratio of the vehicle speed to the airflow AF2). The range A is a range between the distance L1 of the inlet 14 and the distance L2 of the outlet 15 where the Cd value in traveling of the vehicle 3 tends to decrease. That is, when the distance L1 is small, the distance d is also small, and the area where the inner wall portion 13 collides with the airflow AF1 is small, so the air resistance (Cd value) is low. The range B is a range between the distance L1 of the inlet 14 and the distance L2 of the outlet 15 where the airflow AF2 can reduce adhesion of water droplets on the rear window glass 5 in the vehicle speed ratio. That is, a range of distances L1 and L2 in which water droplets and the like attached to the rear window glass 5 are blown off by the airflow AF2 and an air curtain effect can be obtained is shown. The range C is a range where the range A and the range B overlap. That is, the range of the distance L1 of the inflow port 14 and the distance L2 of the outflow port 15 that can prevent adhesion of water droplets on the rear window glass 5 while lowering the Cd value is shown. In the area C, the ratio between the distance L1 and the distance L2 is particularly preferably 11:14. In the area C, the ratio between the distance L1 and the distance L2 may not be strictly 11:14.

  The airflow generated by the traveling of the vehicle 3 will be described.

  Airflows shown in FIG. 2 are airflows AF1, AF2, and AF3 generated around the vehicle 3 and in the rear spoiler device 1. The airflow AF1 is generated above the upper surface 4b of the roof 4 and the upper wall portion 11 of the rear spoiler 2, and flows to the rear of the vehicle 3 along the upper surface 4b and the upper wall portion 11 of the roof 4. A part of the airflow AF <b> 2 branches off, flows in from the inlet 14, passes through the air flow path 10, flows out of the outlet 15, and flows downward along the rear window glass 5. In the air flow AF3, a part of the air flow AF1 flowing above the upper wall portion 11 flows rearward along the upper wall portion 11, flows rearward behind the rear side end 11a of the upper wall portion 11, and flows obliquely downward. .

  Further, since the air flow path 10 has a structure in which the distance L is gradually increased to increase the air flow path 10, the air pressure in the air flow path 10 gradually increases due to the diffuser effect, and the air flow from the outlet 15. AF2 flows vigorously. Then, the air flow AF2 in the air flow path 10 flows more smoothly, the negative pressure in the air flow path 10 increases, and more air around the roof 4 and the rear spoiler 2 is taken into the air flow path 10 from the inlet 14. It is. A large amount of air can flow along the rear window glass 5 toward the rear of the vehicle.

  As described above in detail, according to the present embodiment, the following effects can be obtained.

(1) In the rear spoiler device 1, the distance L of the air flow path 10 formed between the rear spoiler 2 and the rear window glass 5 is gradually increased from the inlet 14 to the outlet 15, By increasing the pressure, air can be easily taken into the air flow path 10 without increasing the air resistance. As a result, a large amount of the air taken in can be directed to the rear window glass 5, the negative pressure on the rear surface 8 of the vehicle is reduced, and adhesion of water droplets or the like caused by wind wrapping around or entraining from the side of the vehicle is suppressed, and the air is clean. The effect can be improved. Further, since the negative pressure can be reduced, the pressure resistance due to the air applied to the vehicle 3 can be reduced. Thereby, the fuel consumption of the vehicle can also be improved.

(2) By causing the diffuser effect to the airflow AF2 in the air flow path 10, it is possible to provide the rear spoiler device 1 that easily takes in air and reduces the negative pressure on the rear surface 8 of the vehicle.

(3) The airflow AF2 that can suppress the increase in air resistance and reduce the negative pressure on the vehicle rear surface 8 can be more reliably formed in the air flow path 10.

(4) A branched airflow AF3 different from the airflow AF2 flows toward the rear of the vehicle 3 along the upper wall portion 11 gradually lower than the upper surface 4b of the roof 4. Thereby, the airflow AF3 flows downward in the vehicle 3, the negative pressure behind the vehicle 3 can be reduced, and the cleaning effect can be improved.

(5) Since the air flow path 10 is gradually expanded, due to the diffuser effect, the air pressure in the air flow path 10 gradually increases, and the air flows out from the outlet 15 of the air flow path 10 vigorously. Then, the airflow AF2 in the air flow path 10 becomes a smoother flow, and the negative pressure increases. Thereby, more air around the roof 4 and the rear spoiler 2 can be taken into the air flow path 10 from the inlet 14. That is, the distance d from the upper end 13a of the inner wall 13 to the reference surface F of the upper surface 4b of the roof 4 can be further reduced, and the air resistance applied to the vehicle 3 can be reduced.

1 Rear spoiler device
2 Rear spoiler
3 Vehicle
4 Roof
4a Rear end 4b Upper surface (roof surface)
5 Rear window glass 6 Mounting piece
7 Mounting piece
8 Vehicle rear
10 Air flow path
11 Upper wall (upper surface)
12 Lower wall
13 Inner wall (wall surface)
13a Upper end
13b Lower end
14 Inlet (entrance)
15 Outlet (exit)
L1 distance (inflow width)
L2 distance (outflow width)
d Distance R Angle AF1, AF3 Airflow AF2 Airflow (downward flow)

Claims (4)

A part of the airflow that is installed on the rear side of the roof of the vehicle and has a wall surface that forms an air flow path with the rear window glass of the vehicle, and moves rearward along the roof surface of the roof during traveling A rear spoiler device for a vehicle that causes a downward flow toward the rear window glass through the air flow path,
The wall surface is formed to gradually widen the air flow path so that an outflow width of the outlet on the rear window glass side in the air flow path is larger than an inflow width of the inlet on the roof side in the air flow path. Rear spoiler device for vehicles.   The vehicle rear spoiler device according to claim 1, wherein the ratio between the inflow width and the outflow width is a ratio that causes a diffuser effect in the downflow in the air flow path.   The rear spoiler device for a vehicle according to claim 2, wherein a ratio between the inflow width and the outflow width is approximately 11:14.   4. The rear spoiler device for a vehicle according to claim 3, wherein the rear spoiler device for a vehicle according to claim 3, further comprising an upper surface for branching the airflow separately from the downflow and moving the airflow backward, the upper surface gradually becoming lower than the roof surface toward the rear.

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