JP4888764B2 - Vehicle side skirt - Google Patents

Description

  The present invention relates to a side skirt of a vehicle disposed at the lower part of both ends of a vehicle body in the vehicle width direction.

  In a vehicle such as a freight vehicle equipped with a loading platform behind the vehicle, it is known that side skirts are arranged below both side surfaces of the loading platform or the like in order to reduce air resistance during travel.

JP-A-9-109826

  However, since such a side skirt is formed in a flat plate shape, it is difficult to rectify the side wind when the side wind is received during traveling of the vehicle.

  Here, in general, when a vehicle receives a crosswind during traveling, a pressure difference is generated on both side surfaces (left and right side surfaces) of the vehicle, particularly the rear side thereof, and a lateral force acts on the vehicle body. Further, when the aerodynamic center of the lateral force is separated from the position of the center of gravity of the vehicle by a predetermined length, a yawing moment that rotates the vehicle body about the vertical axis acts on the vehicle body. The occurrence of such a lateral force and yawing moment significantly reduces the steering stability (crosswind stability) of the vehicle.

  Such inconvenience can be avoided by reducing the size (area) of the side skirt itself, but such reduction of the side skirt causes an increase in air resistance during vehicle travel.

  Accordingly, an object of the present invention is to provide a side skirt for a vehicle that can achieve both improvement in crosswind stability and reduction in air resistance when the vehicle is traveling.

  In order to achieve the above object, a vehicle side skirt according to the present invention includes a skirt body that is disposed at the lower part of both ends in the vehicle width direction of the vehicle body in the vehicle longitudinal direction and extends in the vehicle vertical direction to cover the lower part of the vehicle body. The skirt body includes a communication portion that is provided in the vehicle front-rear direction and communicates with the outer surface on the outer side in the vehicle width direction and the inner surface on the lower side of the vehicle body.

  In the above configuration, the skirt body provided with the communication portion extends in the vehicle up-down direction and is disposed in the vehicle front-rear direction at the lower part of both ends in the vehicle width direction of the vehicle body. For this reason, the air flow during vehicle travel is adjusted so as to be rectified by the outer surface of the skirt body. Therefore, the air flowing under the both sides in the vehicle width direction of the vehicle body during the traveling of the vehicle is well guided to the rear of the vehicle, so that the air resistance of the vehicle can be reduced.

  Further, the skirt body disposed at the lower part of both ends in the vehicle width direction of the vehicle body is formed with a communication portion that communicates the outer surface and the inner surface in the vehicle front-rear direction. For this reason, if a crosswind is received when the vehicle is running, the crosswind passes through the side skirt communication portion on the side receiving the crosswind and reaches the lower part of the vehicle body, and the air flowing into the lower part of the vehicle body receives the crosswind. It is discharged to the outside of the vehicle through the side skirt communicating part. That is, since the pressure difference between the outer surface side and the inner surface side of the side skirt on the side receiving the side wind is alleviated by the inflow of the side wind to the lower part of the vehicle body through the side wind communication portion, the side force on the vehicle can be reduced. . On the other hand, the pressure difference between the outer surface side of the side skirt on the side receiving the side wind and the outer surface side of the side skirt on the side not receiving the side wind due to the discharge of the air flowing into the lower part of the vehicle body to the outside of the vehicle Therefore, it is possible to suppress the generation of the yawing moment. Therefore, since the influence of the cross wind on the vehicle body is sufficiently mitigated, it is possible to reliably improve the cross wind stability of the vehicle.

  As described above, the simple structure of providing the communication portion in the skirt body can improve the crosswind stability of the vehicle without impairing the original function of the side skirt, which is to reduce the air resistance.

  The opening area on the vehicle rear side of the communication portion may be set larger than the opening area on the vehicle front side.

  In the above configuration, the air passing through the communication part of the side skirt circulates more on the vehicle rear side than on the vehicle front side. In other words, when the vehicle is subjected to cross winds, a large amount of air flows through the rear side communication parts on the rear side of the vehicle body in the vehicle width direction where the most pressure difference is generated. Since the acting lateral force is effectively reduced, the generation of the yawing moment can be further suppressed. In addition, the air flowing along the side of the vehicle body during traveling of the vehicle is eliminated from the turbulent state as it goes to the vehicle rear side. Therefore, even if the opening area of the communication portion on the vehicle rear side is set large, The effect on air resistance is relatively small. Therefore, it is possible to effectively improve the crosswind stability while maintaining the effect of reducing the air resistance of the vehicle.

  Further, the skirt body is provided with a plurality of plate-like portions that are arranged side by side in the vehicle vertical direction, each extending in the vehicle front-rear direction, and the communication portion is a plate-like portion that is adjacent in the vertical direction among the plurality of plate-like portions. The lower end portion and the upper end portion of the plate portion may be formed into a slit shape extending along the vehicle longitudinal direction, and at least one of the lower end portion and the upper end portion of the plate-like portion communicates from the horizontal direction outside in the vehicle width direction. You may provide the blindfold part which obstructs visual recognition of the lower part of a vehicle body, when viewing a part.

  In the above configuration, the communication portion is defined by the lower end portion and the upper end portion of the plate portions adjacent to each other in the vertical direction among the plurality of plate portions of the skirt body, and the communication portion is viewed from the horizontal direction on the outer side in the vehicle width direction. In the state, the lower part of the vehicle body is blindfolded by a blindfold provided on at least one of the lower end and the upper end of the plate-like part. That is, it is possible to provide a structure in which the structural members of the vehicle such as the engine disposed in the lower portion of the vehicle body are not exposed from the outside while ensuring the air flow through the communication portion. Therefore, it is possible to improve the cross wind stability of the vehicle while improving the appearance.

  Further, the communication portion has a slit shape extending along the vehicle front-rear direction and is provided in substantially the same direction as the air flowing toward the rear of the vehicle when the vehicle travels, so that the air flow during vehicle travel is communicated. It is not obstructed by the part. Therefore, air flowing under the vehicle width direction on both sides of the vehicle body smoothly travels along the outer surface of the skirt body, so that the air resistance of the vehicle can be reduced.

  Further, the communication portion may be a through hole formed in the skirt body.

  In the above configuration, since the communication part is a through-hole formed integrally with the skirt body, the production of the communication part, simplification of the assembly work of the side skirt to the vehicle body, and reduction of the number of parts are ensured. be able to.

  In addition, since the communication portion is a through hole and is easy to manufacture, the shape of the through hole is changed to various shapes, for example, a shape that reduces air resistance, from the outer surface side to the inner surface side of the skirt body. Thus, it is also possible to form a substantially arm-shaped cross section with a reduced opening area.

  According to the present invention, it is possible to reliably achieve both the improvement of the crosswind stability of the vehicle and the reduction of the air resistance with a simple configuration.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. 1 is a side view of a truck provided with a side skirt according to the present embodiment, FIG. 2 is an enlarged cross-sectional view of the main part of the side skirt on the front side of the vehicle, FIG. 3 is an enlarged cross-sectional view of the main part of FIG. Fig. 5 is an enlarged cross-sectional view of the main part of the side skirt on the rear side of the vehicle, Fig. 5 is an enlarged cross-sectional view of the main part of Fig. 4, Fig. 6 is a diagram showing the flow of air when the vehicle is running without wind, and Fig. 7 is receiving the cross wind. It is a figure which shows the flow of the air when a vehicle drive | works. In the figure, FR is the front of the vehicle, UP is the upper side of the vehicle, B, C and D in FIG. 6 and B are the air flow (airflow), (+) in FIG. 7 is the positive pressure, 7 (-) indicates a negative pressure. Moreover, the left-right direction in the following description means the left-right direction in the state which faced the vehicle front.

  As shown in FIG. 1, a vehicle 1 according to this embodiment includes a chassis frame 2 that extends in the front-rear direction on both sides in the vehicle width direction, a cab 3 that is supported from below on a front portion of the chassis frame 2, and a chassis. A load carrier 4 supported from below at the rear of the frame 2, side skirts 5 disposed at lower portions on both sides in the vehicle width direction of the load carrier 4, and vehicle components such as an engine disposed below the load carrier 4 (illustrated) (Omitted).

  As shown in FIGS. 1, 2, and 4, a plurality of horizontal joists 6 extending in the vehicle width direction are attached to the chassis frame 2 in the vehicle front-rear direction. Side rails 7 extending in the vehicle front-rear direction are attached to both ends of the horizontal joists 6, and the loading platform 4 is placed and fixed above the side rails 7. A plurality of stays 8 for attaching the side skirts 5 are attached below the lateral joists 6 in the vehicle front-rear direction.

  The stay 8 includes a stay main body 9 made of a pipe-shaped member and a substantially plate-shaped reinforcing member 10. The stay main body 9 is formed in a substantially L-shape, and is bent downward from the upper rod portion 11 fixed to the lower portion of the horizontal joist 6 by welding or bolts, and the end of the upper rod portion 11 on the outer side in the vehicle width direction. And a side bar portion 12 extending in a horizontal direction. The reinforcing members 10 are arranged on both sides of the stay main body 9 in the vehicle front-rear direction, and both ends thereof are fixed to predetermined positions of the upper bar portion 11 and the side bar portion 12 by welding or welding, respectively.

  As shown in FIGS. 2 and 4, the side skirt 5 is disposed between the front wheel 13 and the rear wheel 14 (see FIG. 1) and extends in the vehicle vertical direction to cover the lower part of the loading platform 4 on the front side of the vehicle. A vehicle rear side skirt main body (skirt main body) 16 and a vehicle rear side skirt main body (skirt main body) disposed on the vehicle rear side of the rear wheel 14 and extending in the vehicle vertical direction and covering the vehicle rear side lower portion of the loading platform 4. ) 17 and the vehicle front side skirt main body 16 and the vehicle rear side skirt main body 17 are provided across the vehicle front-rear direction, and communicates the outer surface on the outer side in the vehicle width direction with the inner surface on the lower side of the loading platform 4. A vehicle front side communication part (communication part) 18 and a vehicle rear side communication part (communication part) 19 are provided.

  As shown in FIGS. 2 and 3, the vehicle front side skirt main body 16 includes a plurality of plate-like portions 21 that are disposed substantially parallel to the vehicle vertical direction and extend in the vehicle vertical direction. The plate-like portion 21 has a substantially Z-shaped cross section, a substantially plate-like front wall portion 23, a substantially plate-like side wall portion 24 that bends from the lower end of the front wall portion 23 to the lower side of the loading platform 4, and a side wall. And a substantially plate-like rear wall portion 25 bent downward from an end portion on the lower side of the loading platform 4 of the portion 24.

  As shown in FIGS. 4 and 5, the vehicle rear side skirt main body portion 17 has a plurality of plate-like portions 22 that are arranged substantially parallel to the vehicle vertical direction and extend in the vehicle vertical direction. Similar to the plurality of plate-like portions 21, the plate-like portion 22 has a substantially Z-shaped cross section, extends from the substantially plate-like front wall portion 26 and the lower end of the front wall portion 26 to the lower side of the loading platform 4. It has a substantially plate-like side wall part 27 and a rear wall part 28 that bends downward and extends from the lower end of the loading platform 4 of the side wall part.

  As shown in FIGS. 2 to 5, the width in the vehicle vertical direction of the front wall portion 23 and the rear wall portion 25 of the plate-like portion 21 is the vehicle vertical direction of the front wall portion 26 and the rear wall portion 28 of the plate-like portion 22. It is set longer than the width of. Further, the side wall portion 24 of the plate-like portion 21 and the side wall portion 27 of the plate-like portion 22 are set to have substantially the same width in the vehicle width direction.

  The vehicle front side skirt main body 16 and the vehicle rear side skirt main body 17 are attached to the stay 8 at the lower part of the loading platform 4 of the rear wall portion 25 of the plurality of plate-like portions 21 and the rear wall portion 28 of the plurality of plate-like portions 22. This is performed by welding, bolting, or the like with the inner surface of the side in contact with predetermined positions on the outer side in the vehicle width direction of the side bar portion 12 of the stay 8.

  In a state where the vehicle front side skirt main body 16 and the vehicle rear side skirt main body 17 are attached to the stay 8, the outer surface of each front wall portion 23 of the plurality of plate-like portions 21 and the plurality of plate-like portions. The outer surface of each front wall part 26 of 22 is arrange | positioned on the substantially the same straight line in a vehicle up-down direction, and the outer surface of the front wall part 23 of the plate-shaped part 21 and the outer surface of the front wall part 26 of the plate-shaped part 22 are They are arranged on substantially the same straight line in the vehicle longitudinal direction. In this state, the vehicle front skirt main body 16 and the vehicle rear skirt main body 17 have substantially the same width in the vehicle vertical direction.

  When the vehicle front skirt body 16 is attached to the stay 8, the lower end (blindfold) 31 and the lower plate of the rear wall 25 of the upper plate 21 adjacent to each other in the vertical direction are provided. The upper end portion (blindfolded portion) 32 of the front wall portion 23 of the portion 21 is disposed to face. Similarly, in a state where the vehicle rear side skirt main body portion 17 is attached to the stay 8, the lower end portion (blindfolded portion) 33 of the rear wall portion 28 of the upper plate-like portion 22 adjacent in the vertical direction and the lower plate are provided. The upper end portion (blindfolded portion) 34 of the front wall portion 26 of the shape portion 22 is disposed so as to face. With the arrangement of the plurality of plate-like portions 21 and the plurality of plate-like portions 22, in the state where the vehicle front side skirt main body portion 16 and the vehicle rear side skirt main body portion 17 are viewed from the horizontal direction outside in the vehicle width direction, 4 is the lower end portion 31 of the upper plate-like portion 21 and the upper end portion 32 of the lower plate-like portion 21, and the lower end portion 33 of the upper plate-like portion 22 and the upper end of the lower plate-like portion 22. Part 34 is blindfolded.

  As shown in FIG. 2 and FIG. 3, the vehicle front side communication portion 18 includes a side wall portion 24 and a rear wall portion 25 of the upper plate-like portion 21 adjacent in the vertical direction among the plurality of plate-like portions 21, and a lower side portion. It is formed by a slit shape that is partitioned by the front wall portion 23 and the side wall portion 24 of the plate-like portion 21 and extends along the vehicle front-rear direction, and includes a lower end portion 31 of the upper plate-like portion 21 and a lower plate-like portion 21. An opening 35 is formed between the upper end 32 and the vehicle front-rear direction.

  As shown in FIGS. 4 and 5, the vehicle rear side communication portion 19 includes a side wall portion 27 and a rear wall portion 28 of the upper plate-like portion 22 adjacent in the vertical direction among the plurality of plate-like portions 22, and a lower side portion. The plate-shaped portion 22 is formed by a slit shape that is partitioned by the front wall portion 26 and the side wall portion 27 and extends along the vehicle front-rear direction, and includes a lower end portion 33 of the upper plate-shaped portion 22 and a lower plate-shaped portion 22. An opening 36 is formed between the upper end 34 and the vehicle front-rear direction.

  Further, the width of the vehicle rear side communication portion 19 in the vehicle vertical direction is such that the front wall portion 26 and the rear wall portion 28 of the plate-like portion 22 are in the vehicle vertical direction, and the front wall portion 23 and the rear wall portion of the plate-like portion 21. 25 is set to be narrower than the width of the vehicle front side communication portion 18 in the vehicle vertical direction.

  As shown in FIGS. 2 and 4, in the present embodiment, the vehicle rear side communication portion is set by setting the quantity of the vehicle rear side communication portion 19 to be larger than the quantity of the vehicle front side communication portion 18 provided. The total area of the nineteen openings 36 is larger than the total area of the openings 35 of the vehicle front side communication portion 18. For this reason, when comparing the side skirt 5 on the vehicle front side and the side skirt 5 on the vehicle rear side, the side skirt 5 on the vehicle rear side allows more air to flow than the side skirt 5 on the vehicle front side. Is possible.

  Next, the air flow with respect to the vehicle provided with the side skirt according to the present invention will be described based on FIGS. 6 and 7 separately for a case where the vehicle travels in a windless state and a case where the vehicle travels while receiving a cross wind.

  As shown in FIG. 6, when the vehicle 1 equipped with the side skirt 5 (see FIG. 1) travels in a windless state, the airflow A toward the front of the vehicle 1 circulates along both side surfaces of the vehicle 1. . At this time, the airflow A is disturbed toward the rear of the vehicle by the substantially plate-like smooth outer surfaces of the vehicle front skirt main body 16 and the vehicle rear skirt main body 17 (see FIG. 1) arranged in the vehicle front-rear direction. The flow is adjusted from the flow state to the rectification state, and the vehicle is guided well to the rear.

  As shown in FIG. 7, in a state where the vehicle 1 is subjected to a crosswind while traveling, the vehicle 1 is configured to combine the airflow from the front of the vehicle and the airflow from the left side of the vehicle, that is, diagonally forward of the vehicle. It will run in response to the airflow from. In such a case, a positive pressure is generated on the left side of the loading platform 4 of the vehicle 1 (the side receiving the lateral wind) because the flow velocity of the air flow is relatively slow, while the right side of the loading platform 4 (the side not receiving the lateral wind). ), A negative pressure is generated because the flow velocity of the air flow is higher than that on the left side of the loading platform 4. As described above, a pressure difference is generated between the left side and the right side of the loading platform 4, and in particular, a large pressure difference can be generated on the rear side of the loading platform 4.

  However, a vehicle front side skirt main body 16 and a vehicle rear side skirt main body portion 17 provided with a vehicle front side communication portion 18 and a vehicle rear side communication portion 19 are arranged below both ends in the vehicle width direction of the loading platform 4. (Refer to FIGS. 1, 2 and 4), the airflow C toward the vehicle front side skirt main body 16 and the vehicle rear side skirt main body 17 on the left side is the vehicle front side communication portion 18 and the vehicle rear side. It passes through the side communication part 19 well and circulates in the lower part of the loading platform 4. For this reason, the pressure difference generated between the vehicle rear side outer surface of the vehicle front side skirt main body portion 16 and the vehicle rear side skirt main body portion 17 and the inner surface of the lower side of the cargo bed 4 is alleviated. Is alleviated.

  In addition, among the airflow B traveling from the left front side of the vehicle to the right rear side of the vehicle, the airflow C that has flowed into the lower portion of the loading platform 4 through the vehicle front side communication unit 18 is particularly the right side vehicle rear side communication unit. 19, and is effectively discharged from the outer surface of the vehicle rear side skirt main body portion 17 as a vortex airflow D. For this reason, since the big pressure difference which is easy to produce in the back side of the both sides | surfaces of the loading platform 4 is relieve | moderated, generation | occurrence | production of a yawing moment can be suppressed.

  Thus, according to the present embodiment, the vehicle front side skirt main body portion 16 provided with the vehicle front side communication portion 18 and the vehicle rear side skirt main body portion 17 provided with the vehicle rear side communication portion 19 are the vehicle width of the loading platform 4. In the lower part at both ends in the direction, the vehicle extends in the vehicle vertical direction and is disposed in the vehicle longitudinal direction. For this reason, the flow of air during traveling of the vehicle 1 is adjusted so as to be rectified by the outer surfaces of the vehicle front side skirt main body 16 and the vehicle rear side skirt main body 17. Therefore, the air flowing under the both sides in the vehicle width direction of the loading platform 4 during the traveling of the vehicle 1 is favorably guided to the rear of the vehicle 1, so that the air resistance of the vehicle 1 can be reduced.

  Further, the vehicle front side skirt main body portion 16 and the vehicle rear side skirt main body portion 17 disposed at the lower portions at both ends in the vehicle width direction of the loading platform 4 are connected to the vehicle front side communication portion 18 that communicates the outer surface and the inner surface thereof. The vehicle rear side communication part 19 is each formed over the vehicle front-back direction. For this reason, if a cross wind is received when the vehicle 1 is traveling, the cross wind passes through the vehicle front side communication portion 18 and the vehicle rear side communication portion 19 on the side receiving the cross wind and reaches the lower portion of the load bed 4. The air that has flowed into the lower part is discharged to the outside of the vehicle 1 through the vehicle front side communication portion 18 and the vehicle rear side communication portion 19 on the side that does not receive cross wind. That is, by the inflow of the cross wind through the vehicle front side communication portion 18 and the vehicle rear side communication portion 19 to the lower part of the loading platform 4, the vehicle front side skirt main body portion 16 and the vehicle rear side skirt main body portion 17 on the side receiving the cross wind. Since the pressure difference between the outer surface side and the inner surface side is alleviated, the lateral force on the vehicle 1 can be reduced. On the other hand, when the air flowing into the lower part of the loading platform 4 is discharged to the outside of the vehicle 1 via the vehicle front side communication part 18 and the vehicle rear side communication part 19, Since the pressure difference between the outer surface side of the vehicle rear side skirt main body portion 17 and the vehicle front side skirt main body portion 16 on the side that does not receive cross wind and the outer surface side of the vehicle rear side skirt main body portion 17 is alleviated, generation of a yawing moment is prevented. It becomes possible to suppress. Therefore, since the influence of the cross wind on the vehicle 1 is sufficiently mitigated, the cross wind stability of the vehicle 1 can be reliably improved.

  As described above, the vehicle front side skirt main body 16 and the vehicle rear side skirt main body 17 are each provided with the vehicle front side communication portion 18 and the vehicle rear side communication portion 19, thereby reducing air resistance. The cross wind stability of the vehicle 1 can be improved without impairing the original function of the skirt 5.

  Further, since the total area of the opening 36 of the vehicle rear side communication portion 19 is set larger than the total area of the opening 35 of the vehicle front side communication portion 18, the side skirt 5 on the rear side of the vehicle when subjected to cross wind. It is possible to distribute more air than the side skirt 5 on the vehicle front side. For this reason, when the vehicle 1 is subjected to a crosswind when traveling, a large amount of air flows through the vehicle rear side communication portion 19 to the rear side of the both sides in the vehicle width direction of the loading platform 4 where the pressure difference is most generated. Since the lateral force acting on the vehicle 1 is effectively reduced, the generation of the yawing moment can be further suppressed. In addition, since the turbulent state of the air flowing along the side surface of the loading platform 4 when the vehicle 1 travels is eliminated toward the rear side of the loading platform 4, the opening area of the vehicle rear side communication portion 19 is set large. However, the influence on the air resistance of the vehicle 1 is relatively small. Accordingly, it is possible to effectively improve the cross wind stability while maintaining the effect of reducing the air resistance of the vehicle 1.

  Further, in the present embodiment, the vehicle front side communication portion 18 includes the side wall portion 24 and the rear wall portion 25 of the upper plate-like portion 21 adjacent in the vertical direction among the plurality of plate-like portions 21 and the lower plate-like portion. The front wall portion 23 and the side wall portion 24 of the vehicle 21 are partitioned and formed so that the vehicle rear side communication portion 19 has the side wall portion 27 and the rear wall portion of the upper plate-like portion 22 adjacent to each other in the vertical direction among the plurality of plate-like portions 22. 28 and a front wall portion 26 and a side wall portion 27 of the lower plate-like portion 22. Further, in a state where the vehicle front side communication portion 18 and the vehicle rear side communication portion 19 are viewed from the horizontal direction outside in the vehicle width direction, the lower portion of the loading platform 4 is connected to the lower end portion 31 of the upper plate-like portion 21 and the lower plate. The upper end portion 32 of the plate-like portion 21, the lower end portion 33 of the upper plate-like portion 22, and the upper end portion 34 of the lower plate-like portion 22 are blindfolded. That is, it is possible to make a structure in which a vehicle constituent member such as an engine disposed in the lower part of the loading platform 4 is not exposed from the outside while ensuring air circulation by the vehicle front side communication portion 18 and the vehicle rear side communication portion 19. . Accordingly, it is possible to improve the cross wind stability of the vehicle 1 while improving the appearance.

  Further, the vehicle front side communication portion 18 and the vehicle rear side communication portion 19 have a slit shape extending along the vehicle front-rear direction, and are provided in substantially the same direction as the air flowing toward the vehicle rear when the vehicle 1 travels. Therefore, the air flow during traveling is not obstructed by the vehicle front side communication portion 18 and the vehicle rear side communication portion 19. Accordingly, the air flowing under the vehicle width direction both sides of the vehicle body when the vehicle 1 travels smoothly flows along the outer surfaces of the vehicle front side skirt main body portion 16 and the vehicle rear side skirt main body portion 17. Can be reduced.

  In the present embodiment, the plate-like portion 21 of the vehicle front side skirt main body portion 16 and the plate-like portion 22 of the vehicle rear side skirt main body portion 17 have a substantially Z-shaped cross section, but the present invention is not limited to this and is shown in FIG. As shown in FIGS. 9 and 10, the cross section may be a substantially rectangular shape.

Further, the distance between the upper vehicle front side communication portion 18 and the lower vehicle front side communication portion 18 in the vertical direction of the vehicle, and the upper vehicle rear side communication portion 19 and the lower vehicle rear side communication portion 19. The interval in the vertical direction of the vehicle is set to be substantially the same, but can be increased toward the rear of the vehicle. Next, the side skirt according to the second embodiment of the present invention will be described with reference to FIGS. I will explain. FIG. 11 is a side view of a truck provided with a side skirt according to the present embodiment, FIG. 12 is an enlarged side view of the main part of the side skirt on the front side of the vehicle, and FIG. 13 is an enlarged side view of the main part of the side skirt on the rear side of the vehicle. It is. Further, the second embodiment shown in FIGS. 11 to 13 is different from the first embodiment only in the aspect of the side skirt, and the other configurations are the same as the first embodiment. The same numbers are assigned and duplicate descriptions are omitted.

  As shown in FIGS. 11 to 13, side skirts 41 are arranged below the both sides of the loading platform 4 in the vehicle width direction.

  The side skirt 41 includes a vehicle front skirt body (skirt body) 42, a vehicle rear skirt body (skirt body) 43 disposed on the vehicle rear side of the vehicle front skirt body 42, and a vehicle front side. A vehicle front side communication portion (communication) that is provided in each of the skirt main body portion 42 and the vehicle rear side skirt main body portion 43 in the vehicle front-rear direction and communicates the outer surface on the outer side in the vehicle width direction and the inner surface on the lower side of the loading platform 4. Part) 44 and a vehicle rear side communication part (communication part) 45.

  The vehicle front side skirt main body 42 and the vehicle rear side skirt main body 43 are made of plate-like members, and predetermined portions on the inner surface on the lower side of the loading platform 4 are side bar portions 12 of the plurality of stays 8 (FIGS. 2 and FIG. 2). 4), respectively, are fixed by welding, bolting or the like.

  The vehicle front side communication portion 44 is a through-hole having a substantially cylindrical shape, and a plurality of vehicle front side skirt main body portions 42 are formed substantially uniformly.

  The vehicle rear side communication part 45 is a through-hole having substantially the same shape as the vehicle front side communication part 44, and a plurality of vehicle rear side skirt body parts 43 are formed substantially uniformly.

  The opening ratio of the vehicle rear side communication portion 45 with respect to the vehicle rear side skirt main body portion 43 is set to be larger than the opening ratio of the vehicle rear side communication portion 45 with respect to the vehicle front side skirt main body portion 42, and the vehicle rear side communication portion. The total opening area 45 is set larger than the total opening area of the vehicle rear side communication portion 45. For this reason, when comparing the vehicle front side skirt main body part 42 and the vehicle rear side skirt main body part 43, the vehicle rear side skirt main body part 43 circulates more air than the vehicle front side skirt main body part 42. Is possible. In addition, the vehicle front side communication part 44 and the vehicle rear side communication part 45 are arranged substantially uniformly in the vehicle vertical direction like the vehicle front side communication part 18 and the vehicle rear side communication part 19 of the first embodiment. It is preferable to provide it.

  As described above, according to this embodiment, the vehicle front side communication portion 44 and the vehicle rear side communication portion 45 are integrally formed in the vehicle front side skirt main body portion 42 and the vehicle rear side skirt main body portion 43, respectively. Since it is a hole, the manufacture of the vehicle front side communication portion 44 and the vehicle rear side communication portion 45 can be simplified, the assembly work of the side skirt 41 to the vehicle body can be simplified, and the number of parts can be reliably reduced.

  Moreover, since the vehicle front side communication part 44 and the vehicle rear side communication part 45 are through holes, and the manufacture thereof is easy, the shape of the through holes can be formed in various shapes. For example, as shown in FIG. 14, the shape of the through hole is a shape that reduces air resistance, and the opening area from the outer surface side to the inner surface side of the vehicle front side skirt main body portion 42 and the vehicle rear side skirt main body portion 43. It can also be formed in a substantially arm-shaped cross-section where the cross section is reduced.

  In the present embodiment, the vehicle front side communication portion 44 and the vehicle rear side communication portion 45 are formed in substantially the same shape, but the present invention is not limited to this, for example, the shape of the through hole of the vehicle rear side communication portion 45 is The vehicle front side communication portion 44 may be set larger than that. In addition, the vehicle front side communication portion 44 and the vehicle rear side communication portion 45 are formed substantially uniformly on the vehicle front side skirt main body portion 42 and the vehicle rear side skirt main body portion 43, respectively. Alternatively, it may be formed so as to increase toward the rear of the vehicle.

  In the first embodiment and the second embodiment, the side skirt 5 or the side skirt 41 is attached to the stay 8. However, the stay 8 needs to be dedicated for attaching the side skirt 5 or the side skirt 41. For example, a stay for attaching an existing side bumper or the like may be used.

  Furthermore, in the first embodiment and the second embodiment, the side skirt 5 and the side skirt 41 are disposed in the vehicle 1 on which the loading platform 4 is mounted, but may be applied to various types of vehicles such as buses and passenger cars. it can.

  Moreover, it is desirable to set the opening ratio (ratio of the opening area) of the communicating part to the skirt main body part to be 5% or more and 50% or less, and particularly optimally set to 20% or more and 50% or less.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added 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.

It is a side view of the track | truck with which the side skirt which concerns on 1st Embodiment was provided. It is a principal part expanded sectional view of the side skirt of the vehicle front side. It is a principal part expanded sectional view of FIG. It is a principal part expanded sectional view of the side skirt on the vehicle rear side. It is a principal part expanded sectional view of FIG. It is a figure which shows the flow of the air when a vehicle drive | works at the time of a no wind. It is a figure which shows the flow of the air at the time of a vehicle drive | working, receiving a crosswind. It is a principal part expanded sectional view which shows the other example of the side skirt which concerns on 1st Embodiment. It is a principal part expanded sectional view which shows the other example of the side skirt which concerns on 1st Embodiment. It is a principal part expanded sectional view which shows the other example of the side skirt which concerns on 1st Embodiment. It is a side view of the track | truck with which the side skirt which concerns on 2nd Embodiment was provided. It is a principal part enlarged side view of the side skirt of the vehicle front side. It is a principal part enlarged side view of the side skirt on the vehicle rear side. It is a principal part expanded sectional view which shows the other example of the vehicle front side communication part which concerns on 2nd Embodiment, or a vehicle rear side communication part.

Explanation of symbols

1 vehicle 4 cargo bed 5 side skirt 8 stay 16 vehicle front side skirt body (skirt body)
17 Vehicle rear skirt body (skirt body)
18 Vehicle front side communication part (communication part)
19 Vehicle rear side communication part (communication part)
21 Plate-shaped part 22 Plate-shaped part 31 Lower end part (blindfold part)
32 Upper end (blindfold)
33 Lower end (blindfold)
34 Upper end (blindfold)
41 Side skirt 42 Front side skirt body (skirt body)
43 Vehicle rear skirt body (skirt body)
44 Vehicle front side communication part (communication part)
45 Rear side communication part (communication part)

Claims (4)

A skirt body that is disposed in the vehicle longitudinal direction at the lower ends of both ends in the vehicle width direction of the vehicle body, extends in the vehicle vertical direction and covers the lower part of the vehicle body;
The skirt body is provided in a plurality in the vehicle vertical direction across the vehicle longitudinal direction, and includes a communication portion that communicates the outer surface on the vehicle width direction outer side and the inner surface on the lower side of the vehicle body ,
The skirt body has a front skirt body portion disposed between a front wheel and a rear wheel, and a rear skirt body portion disposed on the rear side of the vehicle of the rear wheel,
The side skirt of a vehicle , wherein a total area of the opening of the communication portion in a cross section along the vehicle vertical direction is larger in the rear skirt main body than in the front skirt main body . The vehicle side skirt according to claim 1,
The side skirt of a vehicle according to claim 1, wherein the number of the communication portions along the vehicle vertical direction is greater in the rear skirt main body than in the front skirt main body . The vehicle side skirt according to claim 1 or 2,
The skirt body is arranged side by side in the vehicle vertical direction, each having a plurality of plate-like portions extending in the vehicle front-rear direction,
The communication portion has a slit shape that is partitioned by a lower end portion and an upper end portion of plate portions adjacent in the vertical direction among the plurality of plate portions and extends along the vehicle front-rear direction.
At least one of the lower end portion and the upper end portion of the plate-like portion has a blindfold that prevents visual recognition of the lower portion of the vehicle body when the communication portion is viewed from the horizontal direction outside in the vehicle width direction. Vehicle side skirt. A skirt body that is disposed in the vehicle longitudinal direction at the lower ends of both ends in the vehicle width direction of the vehicle body, extends in the vehicle vertical direction and covers the lower part of the vehicle body;
A plurality of the skirt body in the vehicle front-rear direction, and a communication portion that communicates the outer surface in the vehicle width direction and the inner surface on the lower side of the vehicle body;
The skirt body has a front skirt body portion disposed between a front wheel and a rear wheel, and a rear skirt body portion disposed on the rear side of the vehicle of the rear wheel,
The communication unit, Ri plurality of through holes der which is substantially uniformly formed respectively on said the front skirt main body rear skirt main body,
The vehicle side skirt according to claim 1, wherein an opening ratio of the communication portion is larger in the rear skirt main body than in the front skirt main body .

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