JP4631566B2 - Auto body structure - Google Patents

Description

  The present invention relates to a vehicle body structure of an automobile, and more particularly to a structure of a door panel disposed on the side of an automobile.

  In order to improve the straight running stability of a car that runs at high speed, it is necessary to reduce the lift of the rear wheels. Conventionally, as a technique for reducing the lift of the rear wheel, it is known to attach a rear spoiler or a rear wing to the rear part of a vehicle body of an automobile.

  For example, it has been proposed to attach a rear spoiler made entirely of a strip-shaped plate material to the upper rear end of a trunk lid (see, for example, Patent Document 1).

  In an automobile equipped with such a rear spoiler, the airflow that flows along the rear window from the roof during driving hits the rear spoiler and the speed decreases, thereby increasing the pressure on the trunk lid and increasing the lift of the rear wheels. As a result, the ground contact force of the rear wheels is increased.

  In addition, it has been proposed that a rear wing having a wing shape as a whole is mounted on the upper rear end portion of the trunk lid with a gap between the trunk lid (see, for example, Patent Document 2).

In an automobile equipped with such a rear wing, the air flow that flows along the rear window from the roof during traveling causes a downward reverse lift force on the rear wing as it passes through the rear wing. As a result, the rear spoiler As in the case of, the lift force of the rear wheel decreases and the ground contact force of the rear wheel increases.
Japanese Examined Patent Publication No. 6-86228 Japanese Utility Model Publication No. 6-34223

  However, the above-described conventional technology has a problem in that extra costs are required because the rear spoiler and the rear wing are formed of parts different from the vehicle body.

  In addition, since high wind pressure is applied to the rear spoiler and rear wing during high-speed driving, it is necessary not only to give the rear spoiler and rear wing sufficient strength to prevent deformation and dropout of the rear spoiler and rear wing. It is necessary to secure sufficient strength of the attachment part to the trunk lid, which leads to an increase in the weight of the automobile.

  An object of the present invention is to provide a vehicle body structure of an automobile capable of solving the above-described problems of a rear spoiler and a rear wing.

  In order to solve the above problems, the present invention adopts a vehicle body structure that can reduce the lift of the rear wheels without mounting a rear spoiler or rear wing, thereby increasing the ground contact force of the rear wheels. There is a feature in the point.

  That is, the present invention has a concave portion having a substantially triangular shape when viewed from the side of the vehicle body on the side surface of the vehicle body between the front wheel and the rear wheel, and the triangular concave portion has a bottom side disposed substantially horizontally. , A rear side connecting the apex facing the base and the rear end of the base, and a rear upper side connecting the apex and the front end of the base, and the top is the base along the vehicle longitudinal direction The bottom inner wall surface including the bottom side of the inner wall surface of the recess gradually increases in depth toward the inner side of the vehicle body from the front side to the rear side. The rear inner wall surface including the rear side gradually increases in depth toward the inner side of the vehicle body from the upper side to the lower side of the vehicle body, and further includes a triangle including the upper side and connected to the bottom inner wall surface and the rear inner wall surface. The inner wall of the back of the vehicle is from the front side to the rear side of the car body. Is characterized in that indentations gradually to the inside of the vehicle body respectively is formed larger as going to the bottom side as, and the vehicle body upper side Ku.

  According to the above configuration, when the traveling wind flowing along the side surface of the vehicle body flows into the triangular recess, the flowing traveling wind flows along the upper side. At this time, the traveling wind flows into the conical longitudinal vortex. Is generated. The vertical vortex collides with the rear inner wall surface. However, since the rear inner wall surface is a rearwardly inclined surface, the rear inner wall surface receives a downward force from the vertical vortex. As a result, a downward force can be applied to the rear wheel. In addition, since the central part of the vertical vortex is negative pressure, the vicinity of the inner wall of the inner part is also negative, and the inner wall of the inner part of the inner part is recessed downward toward the inside of the vehicle body. The power of is generated. As a result, an even greater downward force can be applied to the rear wheel.

  According to the present invention, it becomes possible to apply a downward force to the rear wheel without providing a rear spoiler or a rear wing, and the ground contact force of the rear wheel can be effectively increased.

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

  First, Example 1 of the present invention will be described. 1 to 4 show a first embodiment, FIG. 1 is a perspective view of an automobile in which the vehicle body structure of the present invention is applied to a rear door 10, FIG. 2 is an enlarged perspective view of the vicinity of the lower portion of the rear door 10, and FIG. 2 is a sectional view taken along line AA in FIG. 2, and FIG. 4 is a sectional view taken along line BB in FIG.

  As shown in FIG. 1, a recess 11 having a substantially triangular shape when viewed from the side of the vehicle body is formed at the lower portion of the rear door 10. The recess 11 is opposed to the bottom 12 that is horizontally disposed and the bottom 12. A rear side 15 connecting the vertex 13 and the rear end 14 of the base 12, and a rear upper side 17 connecting the vertex 13 and the front end 16 of the base 12. The apex 13 is disposed rearward of the rear end 14 of the base 12 along the vehicle front-rear direction, and the rear side 15 connecting the apex 13 and the rear end 14 is rearwardly raised. In FIG. 1, 18 is a front wheel and 19 is a rear wheel. Although FIG. 1 shows only the left side of the vehicle body, the recess 11 is also formed on the right side of the vehicle body. In this case, the concave portion on the right side of the vehicle body and the concave portion on the left side of the vehicle body are formed in symmetrical shapes with respect to the center line of the vehicle body.

  As shown in FIGS. 2 to 4, among the inner wall surfaces of the recess 11, the bottom inner wall surface 20 including the base 12 gradually increases in depth toward the inner side of the vehicle body from the front side to the rear side of the vehicle body. The rear inner wall surface 21 including the rear side 15 gradually increases in depth toward the inner side of the vehicle body from the upper side to the lower side of the vehicle body. The triangular inner wall surface 22 including the upper side 17 and connected to the bottom inner wall surface 20 and the rear inner wall surface 21 gradually increases from the front side to the rear side of the vehicle body and from the upper side to the lower side of the vehicle body. The dent on the inside of the car body is large.

  An intersecting line 23 between the inner wall surface 22 of the back portion and the inner wall surface 20 of the bottom portion is in a horizontal plane substantially the same as the base 12, and the inner wall surface 20 of the bottom portion is flat and substantially horizontal. The intersection line 24 between the inner wall surface 22 at the back and the inner wall surface 21 at the rear is ahead of the rear side 15, the inner wall surface 21 is inclined rearward and the surface is directed obliquely forward of the vehicle. Yes. The rear inner wall surface 21 is formed flat. The inner wall surface 22 of the inner part is also flat and is connected to the general surface 25 of the rear door 10 via the upper side 17 that forms a broken line.

  Next, the effect | action of a present Example is demonstrated using FIGS. 6 is a cross-sectional view taken along line AA in FIG. 5, and FIG. 7 is a cross-sectional view taken along line BB in FIG.

  Considering the stream line 26 of the traveling wind flowing from the front through the surface of the rear door 10 while the vehicle is traveling, when the stream line 26 reaches the upper side 17, it extends from the lower end 16 (front end of the base 12) to the vertex 13. It peels one after another, and a conical longitudinal vortex 27 is generated along the upper side 17. As shown in FIG. 6, the vertical vortex 27 causes a fluid force F <b> 1 toward the inside of the recess 11 to act on the traveling wind 26 ′ around the recess 11, and the traveling wind 26 ′ is caught inside the recess 11. However, as shown in FIG. 7, it collides with the rear inner wall surface 21 of the rear portion of the recess 11. Since the rear inner wall surface 21 is a surface inclined rearward as described above, a downward force F2 is generated by the collision of the traveling wind 26 'as shown in FIG.

  On the other hand, since the central portion of the vertical vortex 27 has a negative pressure, the vicinity of the inner wall surface 22 of the recess 11 also has a negative pressure. Since the back inner wall surface 22 is inclined toward the inner side of the vehicle body in the lower part, a downward force F3 is generated on the inner wall surface 22 by the negative pressure.

  As described above, the lift force of the rear wheel 19 is reduced by the downward force F2 acting on the rear inner wall surface 21 and the downward force F3 acting on the inner wall surface 22 of the rear portion. Increases and the straight running stability is improved.

  Further, the operation when a crosswind is received in the vehicle body structure of the present embodiment will be described. That is, as shown in FIG. 8, when the vehicle 28 receives the cross wind 29 while traveling, the vehicle 28 is swung to the leeward side with respect to the cross wind 29 to form a yaw angle 30, and at the same time, the vehicle body is caused by wind pressure. Rolls in a direction that tilts leeward. For this reason, in an automobile having a roll understeer characteristic, the vehicle is steered slightly to the leeward side, and the front end portion is further swung to the leeward side in addition to the yaw angle 30 described above, thereby deteriorating the crosswind stability.

  In this embodiment, as shown in FIG. 9, when the crosswind is received, the airflow 31 on the leeward side is peeled off or disturbed from the side of the vehicle body. The speed of 32 is considerably greater than that of the leeward side. Accordingly, the downward force generated by the leeward concave portion 11a is significantly larger than the force of the leeward concave portion 11b. As a result, the rolling moment in the direction of tilting the vehicle body toward the leeward side is reduced, and the roll is reduced. This reduces the influence of roll steer characteristics and improves crosswind stability.

  As described above, according to the present embodiment, in addition to improving the straight running stability by reducing the rear wheel lift, the stability during crosswind driving is also improved.

  Further, according to the present embodiment, the recess 11 can be formed by pressing the outer panel of the rear door 10, and it is not necessary to prepare separate parts such as a rear spoiler and a rear wing as in the prior art, and the cost is increased. Can be suppressed.

  Next, a second embodiment of the present invention will be described. 10 and 11 show the second embodiment. FIG. 10 is an enlarged view of the vicinity of the lower portion of the rear door 10, and FIG. 11 is a cross-sectional view taken along the line CC of FIG.

  In this embodiment, as shown in FIG. 11, a step portion 35 is formed at the upper side 17 of the recess 11. The step portion 35 is bent inward of the vehicle body at a substantially right angle to the general surface 25 of the rear door 10. The depth of the step portion 35 is considerably smaller than the depth of the bottom inner wall surface 20, and the inner wall surface 22 of the back portion is the same as in the first embodiment, as it goes from the front side to the rear side of the vehicle body and from the upper side to the lower side of the vehicle body. The dent toward the inside of the vehicle body gradually increases as it goes to the side. The other configuration of the recess 11 is the same as that of the first embodiment.

  Next, the operation of this embodiment will be described with reference to FIG. Here, FIG. 12 is a cross-sectional view taken along the line CC of FIG.

  While the vehicle is traveling, a conical vertical vortex 27 is generated along the upper side 17 by the traveling wind 26 ′. In this embodiment, the step portion 35 is formed, and therefore the vertical vortex 27 is below the step portion 35. It goes around and grows into a stronger vortex than in the case of Example 1. As a result, the air volume of the traveling wind 26 'that collides with the rear inner wall surface 21 can be increased, and the downward force F2 (see FIG. 5) can be made stronger than in the first embodiment. Further, since the vertical vortex 27 is strong, the negative pressure at the center portion is increased, and the ground contact force of the rear wheel 19 is increased as compared with the first embodiment, and the straight traveling performance and the crosswind stability are improved.

  Next, Embodiment 3 of the present invention will be described. In the present embodiment, the size of the recess 11 is enlarged, and the front portion of the recess 11 reaches the front door 40. That is, the front end 16 of the bottom 12 is positioned on the front door 40, and the front portion of the bottom inner wall surface 20 and the front portion of the inner wall surface 22 are formed on the front door 40. The vertex 13 is arranged at a higher position than in the first embodiment. As a result of enlarging the size of the recess 11 in this way, in this embodiment, the surface areas of the bottom inner wall surface 20, the rear inner wall surface 21 and the back inner wall surface 22 are wider than in the first embodiment. Other configurations are the same as those in the first embodiment.

  According to the present embodiment, the size of the concave portion 11 is enlarged, and the respective surface areas of the rear inner wall surface 21 and the inner wall surface 22 of the rear portion are increased, so that the vertical vortex 27 (see FIG. 5) acts on the rear inner wall surface 21. The downward force F2 and the downward force F3 acting on the inner wall surface 22 by the vertical vortex 27 are both increased, thereby improving the straight running stability and the crosswind stability.

  Next, a fourth embodiment of the present invention will be described. In the present embodiment, as shown in FIG. 14, the rear inner wall surface is not provided in the recess 11, and the rear inner wall surface is formed by a panel front surface 45 </ b> A of the rear fender 45 in contact with the rear door 10. That is, an opening 46 is formed at the rear portion of the recess 11 with the rear end side 20A of the bottom inner wall surface 20 and the rear end side 22A of the inner wall surface 22 as the edges. When the rear door 10 is closed, the opening 46 is formed. It matches the front panel 45A of the rear fender 45.

  According to the present embodiment, since the opening 46 is formed at the rear portion of the recess 11, the recess 11 can be easily molded, and the rear door 10 can be manufactured at low cost.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, each of the above embodiments is only an example of the present invention, and the present invention is not limited only to the configuration of each of the above embodiments. . Needless to say, changes in design and the like within the scope of the present invention are included in the present invention. For example, the present invention can be applied not only to sedan type passenger cars but also to coupe type passenger cars.

1 is a perspective view of an automobile to which a vehicle body structure according to Embodiment 1 is applied. FIG. 2 is an enlarged perspective view near the rear door of the automobile shown in FIG. 1. It is sectional drawing along the AA line of FIG. It is sectional drawing along the BB line of FIG. It is a figure explaining the principle of this invention. It is sectional drawing along the AA line of FIG. It is sectional drawing along the BB line of FIG. It is a figure explaining a behavior when the motor vehicle under driving receives crosswind. It is a figure explaining a mode that a cross wind acts on the motor vehicle under driving. It is a perspective view of the rear door vicinity of the motor vehicle to which the vehicle body structure by Example 2 is applied. It is sectional drawing along CC line of FIG. In FIG. 11, it is a figure explaining a mode that driving | running | working wind acts. FIG. 6 is a perspective view of an automobile to which a vehicle body structure according to a third embodiment is applied. It is a perspective view of the rear door vicinity of the motor vehicle to which the vehicle body structure by Example 4 is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rear door 11 Recessed part 12 Bottom side 13 Vertex 14 Rear end 15 Rear side 16 Front end 17 Upper side 18 Front wheel 19 Rear wheel 20 Bottom inner wall surface 21 Rear inner wall surface 22 Rear inner wall surface 25 General surface 27 Vertical vortex 29 Cross wind 35 Step 40 Front door 45 Rear fender 45A Panel front 46 Opening

Claims (5)

On the side surface of the vehicle body between the front wheel and the rear wheel, there is a concave portion whose shape when viewed from the side of the vehicle body is roughly triangular,
The triangular concave portion includes a bottom that is disposed substantially horizontally, a rear side that connects a vertex facing the base and the rear end of the base, and a rear upper side that connects the vertex and the front end of the base. And the apex is arranged rearward of the rear end of the bottom along the vehicle body longitudinal direction,
Of the inner wall surface of the recess, the bottom inner wall surface including the bottom side gradually increases in depth toward the inner side of the vehicle body from the front side to the rear side of the vehicle body, and the rear inner wall surface including the rear side is the upper portion of the vehicle body The depth from the side toward the lower side gradually increases toward the inside of the vehicle body, and the inner wall surface of the triangle including the upper side and connected to the inner wall surface of the bottom portion and the inner wall surface of the rear portion extends from the front side to the rear side of the vehicle body. A vehicle body structure for an automobile characterized in that a dent toward the inner side of the vehicle body gradually increases as it goes to the side and from the upper side to the lower side of the vehicle body. The automobile body structure according to claim 1, wherein the recess is provided in a rear door . The vehicle body structure according to claim 1, wherein the recess is arranged from a front door to a rear door . The vehicle body structure according to any one of claims 1 to 3, wherein the rear inner wall surface is formed on a front surface of a rear fender panel . The vehicle body structure according to any one of claims 1 to 4, wherein the inner wall surface of the inner part is disposed on the inner side of the general surface of the vehicle body.

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