CN211252818U - Tail wing of vehicle - Google Patents

Abstract

The utility model provides a tail wing of vehicle. The tail fin of the vehicle is provided with a fin main body extending along the vehicle width direction and winglets at two sides extending downwards along the side surface of the vehicle body from two ends of the fin main body in the vehicle width direction, wherein each winglet is provided with a front end edge and a rear end edge positioned behind the front end edge, and the front end edge is connected with the end part of the fin main body in the vehicle width direction and extends backwards while extending downwards; the rear end edge is connected to the vehicle width direction end portion of the wing main body and extends toward the lower end of the front end edge. Based on the above structure of the utility model, can improve the straight line stability of traveling and the ability of turning to of vehicle.

Description

Tail wing of vehicle

Technical Field

The utility model relates to a fin of vehicle.

Background

Generally, in order to improve the aerodynamic characteristics of a vehicle, a tail fin is mounted on the outer side of a vehicle body. In a vehicle provided with a trunk, the rear wing is generally mounted on the top surface of a trunk lid. In the case of hatchback vehicles, the tail fin is typically mounted on the upper portion of the rear door. By installing the tail wing on the outer surface of the vehicle body, the air flow flowing along the outer surface of the vehicle body during traveling can be rectified, thereby enabling the air resistance to be reduced. Further, a biasing force (down force) for biasing the vehicle body in the direction of the road surface can be generated, thereby improving the running stability.

However, the tail fin of the related art does not contribute to improvement of straight running stability and steering ability of the vehicle.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a tail fin of a vehicle capable of improving the straight running stability and the steering ability of the vehicle.

As a technical scheme who solves above-mentioned technical problem, the utility model provides a fin of vehicle, the fin of this vehicle is installed at the rear portion of automobile body, its characterized in that: the vehicle body comprises a wing body extending along the vehicle width direction and winglets extending downwards along the side surface of the vehicle body from the two ends of the wing body in the vehicle width direction, wherein each winglet is provided with a front end edge and a rear end edge positioned behind the front end edge, and the front end edge is connected with the end part of the wing body in the vehicle width direction and extends backwards while extending downwards; the rear end edge is connected to an end portion of the wing main body in the vehicle width direction and extends toward a lower end of the front end edge.

The utility model discloses an advantage of the fin of above-mentioned vehicle lies in, can improve the straight line stability of traveling and the ability of turning to of vehicle. Specifically, when the vehicle is traveling, the wingtip vortex is generated in the vicinity of the lower ends of the leading edge and the trailing edge of the winglet, and the wingtip vortex flows along the vehicle body side surface because the winglet extends downward along the vehicle body side surface. Therefore, the flow velocity of the air flowing along the vehicle body side surface is increased, and the boundary layer (the region where the velocity of the air flowing against the vehicle body is lower than the vehicle speed) in the vicinity of the vehicle body side surface can be thinned. As a result, the following ability of air to the vehicle body during vehicle movement (forward movement during forward travel and movement in the steering direction during turning) can be improved, that is, the straight-line travel stability and the steering ability of the vehicle can be improved.

In the above-described vehicle empennage, the winglet is preferably formed such that the rear end edge extends rearward while extending downward. With this configuration, the shape of the rear edge can promote the tip vortex to be generated well, and the straight-line running stability and the steering ability of the vehicle can be further improved.

In the tail wing of the vehicle according to the present invention, it is preferable that the winglet is configured such that a surface facing outward in the vehicle width direction is a flat surface, and a surface facing inward in the vehicle width direction is a curved surface bulging inward in the vehicle width direction. With this configuration, the flow velocity of air flowing along the surface facing the inside in the vehicle width direction among the air flowing near the winglets during traveling is higher than the flow velocity of air flowing along the surface facing the outside in the vehicle width direction. Thus, the outer pressure of each winglet is higher than the inner pressure. That is, a pressure acting on the vehicle body at the intermediate portion in the vehicle width direction is generated. This pressure also contributes to an improvement in the straight running stability of the vehicle.

In addition, in the empennage of the vehicle of the present invention, preferably, the wing main body is formed such that an upper surface facing upward is a flat surface and a lower surface facing downward is a curved surface bulging downward. With this configuration, the flow velocity of air flowing along the bottom surface of the wing main body is higher than the flow velocity of air flowing along the top surface of the wing main body in the air flowing near the wing main body during traveling. Thereby, the upper pressure of the wing body is higher than the lower pressure. That is, a downward force acting downward is generated in the vehicle body. This depression force also contributes to an improvement in running stability.

Drawings

Fig. 1 is a rear view of a vehicle body to which a tail fin in a first or second embodiment of the present invention is attached.

Fig. 2 is a view showing the rear wing in the direction of arrow II in fig. 1 in the first embodiment.

Fig. 3 is a view showing the rear wing in the direction of arrow III in fig. 1 in the first embodiment.

Fig. 4 is a view of the winglet on the left side of the tail wing and its surroundings in the first embodiment, seen from the rear of the vehicle body.

Fig. 5 is a diagram illustrating the flow of tip vortices generated in the vicinity of the lower end of the winglet on the right side of the tail in the first embodiment.

Fig. 6 is a diagram showing the flow velocity of air flowing in the vicinity of the side surface of the right rear portion of the vehicle body in the first embodiment.

Fig. 7 is a diagram showing the flow velocity of air flowing in the vicinity of the side surface of the right rear portion of the vehicle body according to the related art.

Fig. 8 is a view in the direction of arrow II in fig. 1 showing the tail wing in the second embodiment.

Fig. 9 is a view of a winglet on the left side in the third embodiment of the present invention and its surroundings, as seen from the rear of the vehicle body.

Fig. 10 is a view showing the direction of arrow X in fig. 9.

Detailed Description

Hereinafter, several embodiments of the present invention will be described with reference to the drawings.

< first embodiment >

Fig. 1 shows a rear portion of a vehicle body 1 on which a tail 2 in the present embodiment is mounted, fig. 2 is a view in the direction of an arrow II in fig. 1, and fig. 3 is a view in the direction of an arrow III in fig. 1. In each figure, an arrow FR indicates the front of the vehicle body; arrow RR indicates the vehicle body rear; the arrow LH indicates the left side in the vehicle width direction; arrow RH indicates the right side in the vehicle width direction; arrow UP indicates UP.

As shown in the above figures, the tail fin 2 is attached to the top surface of the trunk lid 11 of the vehicle body 1 by a plurality of (two in the present embodiment) brackets 12. The rear wing 2 is disposed with a prescribed interval from the top surface of the trunk lid 11.

The tail fin 2 includes a fin body 3 and winglets 4 provided at both ends of the fin body 3 in the vehicle width direction. The tail fin 2 is integrally formed of synthetic resin.

As shown in fig. 3, the wing body 3 is configured such that a portion located on the vehicle width direction outer side is located on the vehicle body front side with respect to a portion located on the vehicle width direction inner side. That is, in a plan view (fig. 3), the front end edge 31 and the rear end edge 32 of the blade body 3 are each shaped so as to extend outward in the vehicle width direction and curve toward the vehicle body front side.

As shown in fig. 1 and 2, the wing body 3 is configured such that a portion located on the outside in the vehicle width direction is located on the lower side of the vehicle body than a portion located on the inside in the vehicle width direction. That is, in a rear view (fig. 1), the top surface 33 and the bottom surface 34 of the wing body 3 are each curved toward the vehicle body lower side while extending outward in the vehicle width direction.

The two brackets 12 are attached to the left and right sides in the vehicle width direction at positions that are a predetermined dimension from the center of the bottom surface 34 of the wing body 3. Fig. 4 is a view of the winglet 4 on the left side of the empennage 2 and its surroundings, as viewed from the rear of the vehicle body 1. As shown in fig. 4, a mounting plate 35 extending in a direction perpendicular to the vehicle width direction is integrally formed on the bottom surface 34 of the wing body 3. On the other hand, the bracket 12 includes a fixing portion 13 for connecting to the top surface of the luggage cover 11, and two support plates 14 extending upward from the fixing portion 13. The dimension of the space between the two support plates 14 is substantially the same as the plate thickness dimension of the mounting plate 35. The mounting plate 35 is inserted between the two support plates 14, and the mounting plate 35 is coupled with the support plates 14 by rivets 15 inserted through-holes (not shown) formed in the mounting plate 35 and the respective support plates 14, so that the rear wing 2 is mounted on the top surface of the trunk lid 11 by the brackets 12.

In a cross section of the blade body 3 in the vehicle length direction (a cross section perpendicular to the vehicle width direction), an upper edge line of the cross section is a straight line, and a lower edge line of the cross section is a curved line bulging downward. That is, the blade body 3 is formed into a blade shape in which the top surface 33 is a flat surface and the bottom surface 34 is a curved surface bulging downward.

The main feature of this embodiment is the structure of the winglet 4. Specifically, the two winglets 4 are configured to extend downward along the side surface 16 of the vehicle body 1 from both ends of the wing body 3 in the vehicle width direction. Specifically, the winglet 4 extends downward along the outer surface (side surface) 16 of the rear fender panel 17.

As shown in fig. 2, the winglet 4 has an approximately inverted triangular shape when viewed in the vehicle width direction. Specifically, the winglet 4 has a front end edge 41 and a rear end edge 42 located rearward of the front end edge 41, and the front end edge 41 is continuous with a front end (point P in fig. 2) of the end portion of the wing body 3 in the vehicle width direction and extends rearward while extending downward; the rear end edge 42 is continuous with a rear end (point Q in fig. 2) of the vehicle width direction end portion of the wing main body 3 and extends toward a lower end of the front end edge 41. The rear end edge 42 extends rearward while extending downward in a curved shape. Therefore, the lower end of the winglet 4, i.e., the intersection of the leading edge 41 and the trailing edge 42 (point R in fig. 2) is located rearward of the rear end Q of the end portion of the blade body 3 in the vehicle width direction. The front end edge 41 is inclined rearward of the vehicle body at a larger angle than the rear end edge 42.

In a horizontal cross section of the winglet 4, an outer edge line of the cross section is a straight line, and an inner edge line of the cross section is a curved line bulging inward. That is, the winglet 4 is configured in a wing shape in which a surface (winglet outer surface) 43 facing the outside in the vehicle width direction is a flat surface and a surface (winglet inner surface) 44 facing the inside in the vehicle width direction is a curved surface bulging to the inside in the vehicle width direction. In addition, the shortest interval dimension between the winglet inner side surface 44 and the side surface 16 of the vehicle body 1 may be in the range of 25 to 45 mm.

Fig. 5 is a diagram showing the flow of tip vortices generated in the vicinity of the lower end of the winglets 4 on the right side of the tail 2. As shown in fig. 5, since the winglet 4 has the above-described structure, a wing tip vortex is generated in the vicinity of the lower end of the winglet 4 when the vehicle is running. The tip vortex is a swirling flow that flows along the outer surface of a conical shape (shown by a broken line) that extends toward the rear of the vehicle body with the apex at the intersection of the lower ends of the front end edge 41 and the rear end edge 42. As described above, since the winglet 4 extends downward along the side surface 16 of the vehicle body 1, the wingtip vortex is a swirling flow that flows further rearward along the side surface 16 of the vehicle body 1. Due to the generation of such a wing tip vortex, the flow velocity of the air flowing along the side face 16 of the vehicle body 1 in the vicinity of the wing tip vortex increases. Therefore, the boundary layer (the region where the speed of the air flowing against the vehicle body 1 is lower than the vehicle speed) in the vicinity of the side surface 16 of the vehicle body 1 can be made thin, and the following ability of the air to the vehicle body 1 during vehicle movement can be improved. As a result, the straight-line running stability and the steering ability of the vehicle can be improved. That is, the steering performance when the driver performs the steering operation is improved, and particularly, the steering ability at the start of the steering (during turning) is improved.

Fig. 6 is a view (a plan view of the vehicle body) showing the flow velocity of air flowing in the vicinity of the side surface of the right rear portion of the vehicle body 1 according to the present embodiment during traveling. Fig. 7 is a view (plan view of the vehicle body) showing the flow velocity of air flowing in the vicinity of the side surface of the right rear portion of a conventional vehicle body 1 '(provided with a tail wing 2' without winglets) during traveling. Fig. 6 and 7 show the air flow rates detected in the vicinity of the side surface of the right rear portion of the vehicle body 1 or 1' when the vehicle travels at a speed of 40km/h, respectively. In FIGS. 6 and 7, the region A is a region where the speed of the vehicle body 1 or 1' is 40 km/h; the region B is a region where the speed of the vehicle body 1 or 1' is 30km/h or more but less than 40 km/h; the region C is a region where the speed of the vehicle body 1 or 1' is 20km/h or more but less than 30 km/h; the region D is a region where the speed of the vehicle body 1 or 1' is 10km/h or more but less than 20 km/h; the region E is a region where the speed of the vehicle body 1 or 1' is less than 10 km/h. In the case where a region having a speed of less than 30km/h with respect to the vehicle body 1 or the vehicle body 1' is defined as a boundary layer, the thickness of the boundary layer in the measurement result of the prior art shown in fig. 7 is a thickness shown by a dimension T2 in the drawing; in the measurement results of the present embodiment shown in fig. 6, the thickness of the boundary layer is the thickness indicated by the dimension T1 in the figure. As described above, according to the present embodiment, the boundary layer becomes significantly thinner, that is, the following property of the air to the vehicle body 1 is improved during the movement of the vehicle, as compared with the conventional art, and thus the straight-line running stability and the steering ability of the vehicle can be improved.

As described above, in the horizontal cross section of the winglet 4, the outer edge line of the cross section is a straight line, and the inner edge line of the cross section is a curved line bulging inward. That is, the winglet 4 is configured such that the winglet outer surface 43 facing the outside in the vehicle width direction is a flat surface, and the winglet inner surface 44 facing the inside in the vehicle width direction is a curved surface that bulges inward in the vehicle width direction. Therefore, in the air flowing near the two winglets 4 during traveling, the flow velocity of the air flowing along the winglet inner side surface 44 is higher than the flow velocity of the air flowing along the winglet outer side surface 43. Thus, the pressure on the outside of each winglet 4 is greater than the pressure on the inside. That is, a pressure acting inward in the vehicle width direction is generated in the vehicle body 1. Thus, the straight running stability of the vehicle can be further improved.

As described above, in the cross section of the blade body 3 in the vehicle longitudinal direction, the upper edge line of the cross section is a straight line, and the lower edge line of the cross section is a curved line bulging downward. That is, the blade body 3 is formed into a blade shape in which the top surface 33 is a flat surface and the bottom surface 34 is a curved surface bulging downward. Therefore, the flow velocity of air flowing along the bottom surface 34 is higher than the flow velocity of air flowing along the top surface 33 of the wing main body 3 in the air flowing near the wing main body 3 during traveling. Thus, the pressure on the upper side of the blade body 3 is higher than the pressure on the lower side thereof. That is, a downward pressure is generated in the vehicle body 1. Since the downforce is obtained, the running stability can be further improved.

< second embodiment >

A second embodiment of the present invention will be explained below. In the present embodiment, the shape of the trailing edge 42 of the winglet 4 is different from that in the first embodiment, and the configuration of the other portions is the same as that in the first embodiment. Therefore, only the shape of the trailing edge 42 of the winglet 4 will be described here.

Fig. 1 shows a rear portion of a vehicle body 1 to which a tail 2 of the present embodiment is attached, and fig. 8 is a view showing a direction of an arrow II in fig. 1. As shown in fig. 8, in the present embodiment, the winglet 4 is configured such that the rear end edge 42 thereof extends downward in a direction substantially perpendicular to the vehicle width direction. That is, the rear end edge 42 of the winglet 4 in the present embodiment is continuous with the rear end (point Q in fig. 8) of the end portion of the blade body 3 in the vehicle width direction, and extends straight downward toward the lower end of the front end edge 41.

When the trailing edge 42 of the winglet 4 has the above-described shape, the wing tip vortex is generated as in the first embodiment, and the flow velocity of the air flowing along the side surface 16 of the vehicle body 1 increases, so that the boundary layer in the vicinity of the side surface 16 of the vehicle body 1 becomes thin. This improves the following ability of the air to the vehicle body during the movement of the vehicle. As a result, the straight-line running stability and the steering ability of the vehicle can be improved.

< third embodiment >

A third embodiment of the present invention will be explained below. In the present embodiment, an example in which the tail 2 is applied to an RV vehicle will be described.

Fig. 9 is a view showing the winglet 4 on the left side in the present embodiment and its surroundings, as viewed from the rear of the vehicle body, and fig. 10 is a view in the direction of arrow X in fig. 9. As shown in fig. 9 and 10, in the present embodiment, the wing body 3 of the tail fin 2 is formed in a shape extending along the upper end edge and both side edges of the rear door 5. That is, the wing body 3 is configured by a horizontal portion 36 extending in the horizontal direction along the upper end edge of the rear door 5, and side portions 37 extending along the side edges of both sides of the rear door 5.

In the present embodiment, the winglet 4 is attached to the side portion 37 of the wing body 3. The winglet 4 includes a tabular winglet main body portion 46 and a support portion 47 for supporting the winglet main body portion 46 on the side portion 37 of the wing main body 3.

The winglet body portion 46 is shaped the same as the winglet 4 of the first embodiment described above. That is, the winglet main body portion 46 has a substantially inverted triangular shape when viewed in the vehicle width direction. Specifically, the winglet main body portion 46 includes a front end edge 41 extending rearward while extending downward, and a rear end edge 42 located rearward of the front end edge 41 and extending downward in a curved shape toward a lower end of the front end edge 41.

In the present embodiment, as in the first embodiment, since the wing tip vortex can be generated, the flow velocity of the air flowing along the side surface 16 of the vehicle body 1 is increased, and the boundary layer in the vicinity of the side surface 16 of the vehicle body 1 can be thinned. This improves the following ability of the air to the vehicle body 1 during the movement of the vehicle. As a result, the straight-line running stability and the steering ability of the vehicle can be improved.

The present invention is not limited to the above embodiments, and can be modified as appropriate. For example, in the tail fin 2 according to each of the above embodiments, the fin body 3 and the winglets 4 are integrally formed of a synthetic resin. However, the tail fin 2 may be a metal member. The wing body 3 and the winglets 4 may be independent members.

Claims (4)

1. A tail fin of a vehicle is installed at the rear of a vehicle body, characterized in that:

the wing body is provided with wing bodies extending along the vehicle width direction and winglets extending downwards from two ends of the wing bodies along the side surface of the vehicle body,

the winglet has a front end edge and a rear end edge positioned behind the front end edge, and the front end edge is connected with the end part of the wing main body in the vehicle width direction and extends backwards while extending downwards; the rear end edge is connected to an end portion of the wing main body in the vehicle width direction and extends toward a lower end of the front end edge.

2. The tail wing of a vehicle as claimed in claim 1, wherein:

the winglet is configured such that the rear end edge extends rearward while extending downward.

3. The tail wing of a vehicle according to claim 1 or 2, characterized in that:

the winglet is configured such that a surface facing the outside in the vehicle width direction is a flat surface, and a surface facing the inside in the vehicle width direction is a curved surface bulging toward the inside in the vehicle width direction.

4. The tail wing of a vehicle according to claim 1 or 2, characterized in that:

the wing body is configured such that an upper surface facing upward is a flat surface, and a lower surface facing downward is a curved surface bulging downward.

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