JP5780125B2 - Car side door structure - Google Patents

Description

  The present invention relates to an automobile side door structure.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique in which an extension is provided at an end portion in the longitudinal direction of an impact beam disposed in a rear side door, and the impact beam is fixed to a mounting portion of a door inner panel of the rear side door through the extension. It is disclosed. Furthermore, a bead is set in the extension so as to straddle the vehicle width direction outer side of the vertical wall portion of the door inner panel. As a result, even if the extension hits the corner of the vertical wall of the door inner panel at the time of a side collision, the extension is reinforced by the bead and does not break, and the collision load is applied to the center pillar via the vertical wall of the door inner panel. It is to be transmitted efficiently.

JP 2007-203895 A

  However, in the case of the above prior art, even if the side impact load can be transmitted to the center pillar using the impact beam and the extension, it does not succeed in turning up the lower end portion of the door inner panel. That is, at the time of a side collision, when the lower end portion of the door inner panel comes into contact with the rocker, the lower end portion tends to turn up. In this case, the engagement margin between the lower end portion of the door inner panel and the rocker and the center pillar is reduced, and the load transmission performance to these skeleton members is lowered. Furthermore, since the prior art is a technique for transmitting a collision load at the time of a side collision to the center pillar using additional parts such as an impact beam and an extension, the number of parts is large, resulting in an increase in cost and weight.

  In consideration of the above facts, the present invention provides an automobile side door structure that can improve the load transmission performance from the lower end portion of the door inner panel to the vehicle body skeleton member at the time of a side collision, and can reduce cost and weight. The purpose is to obtain.

The side door structure for an automobile according to the first aspect of the present invention includes a door outer panel disposed outside the vehicle interior and a door inner panel disposed inside the vehicle interior, and is adjacent to the pillar and the rocker. The weakness set in the position which is a predetermined distance in the vehicle front-back direction from the base of the pillar which is the lower end part of the side door main body portion and the door inner panel, which is opposed to the upper part of the rocker in the vehicle width direction. parts and the door than the fragile portion between said weakened portion and a lower portion of the inner panel and the pillar is set in the vehicle width direction inside and the vehicle upper side, a door inner panel as a starting point the fragile portion And a bead for defining the folding direction of the lower end of the.

  According to a second aspect of the present invention, there is provided a side door structure for an automobile according to the first aspect of the present invention, wherein the weakened portion is set at a plurality of locations in the vehicle front-rear direction.

  According to a third aspect of the present invention, there is provided the side door structure for an automobile according to the first or second aspect, wherein the pillar has a front end edge extending from the lower part toward the root so as to extend in a skirt shape in a side view of the vehicle. On the other hand, a flange portion is formed at the upper end portion of the rocker along the vehicle front-rear direction, and the flange portion has a gap in the extending direction of the front end edge of the lower portion of the center pillar. A projecting portion projecting so as to face each other is formed, and the fragile portion and the bead are further connected in a direction connecting the upper corner portion of the front end of the center pillar and the tip end portion of the projecting portion. Has been placed.

  According to a fourth aspect of the present invention, in the vehicle side door structure according to the present invention, the weakened portion is formed at a lower end portion of the door inner panel. It is a drain hole.

According to the first aspect of the present invention, when a side collision occurs, a collision load is first input to the door outer panel. Next, the door outer panel is pushed and the lower end portion of the door inner panel comes into contact with the upper portion of the rocker. Thereby, the weak part formed in the lower end part of the door inner panel deform | transforms as a folding starting point of the turning up of the door inner panel. When the fragile part begins to bend and the lower end of the door inner panel starts to turn up, it is bent and deformed between the fragile part and the pillar toward the bead set in the vehicle width direction and the vehicle upper side of the fragile part. Progresses. That is, the bending deformation starting from the fragile portion proceeds in the direction in which the bead is provided, and does not proceed in the direction in which the bead is not provided. As a result, the turning deformation of the lower end portion of the door inner panel is suppressed (that is, the timing at which the lower end portion of the door inner panel is turned up is delayed), and accordingly, the lapping margin between the lower end portion of the door inner panel and the pillar and the rocker is reduced. Can be secured. As a result, a large amount of collision load at the time of a side collision is transmitted to the vehicle body skeleton members such as pillars and rockers.

  Moreover, in the present invention, the load transmission performance is not secured by using another part such as an impact beam or an extension as in the prior art, but the load transmission performance is secured by the shape of the door inner panel itself. For this reason, the number of parts is reduced.

  According to the second aspect of the present invention, since the fragile portion is set at a plurality of locations in the vehicle longitudinal direction, the lower end portion of the door inner panel is turned up compared to the case where the fragile portion is set at one location. Is suppressed. In this way, by changing the number and positions of the fragile portions, it is possible to change how the lower end portion of the door inner panel is turned up.

  According to the third aspect of the present invention, the protrusion of the flange portion of the rocker and the front end edge from the lower portion of the center pillar toward the root face each other with a gap. Further, the aforementioned fragile portion and bead are arranged in a direction connecting the upper corner portion of the front end of the center pillar and the tip portion of the protruding portion. That is, the upper corner portion of the front end of the center pillar, the tip end portion of the protruding portion (that is, the gap between them), the fragile portion, and the bead are arranged in the same direction. For this reason, the places where the strength changes are arranged in the same direction, and a broken line at the lower end portion of the door inner panel is easily formed in that direction. Overall, the lower end of the door inner panel is arranged by arranging the places where the strength changes in the same direction so that the fold line at the lower end of the door inner panel is easily formed in that direction, while stopping the progress of the fold deformation with a bead. The turn-up of the part is suppressed.

  According to the fourth aspect of the present invention, since the fragile portion is a drain hole formed in the lower end portion of the door inner panel, one function (ie, the hole) can have two functions. it can. For this reason, it is not necessary to newly set a weak part separately from a drain hole.

  As described above, the side door structure for an automobile according to the present invention according to claim 1 can improve the load transmission performance from the lower end portion of the door inner panel to the vehicle body skeleton member at the time of a side collision, and further, the cost and It has an excellent effect that the weight can be reduced.

  The side door structure for an automobile according to the present invention as set forth in claim 2 has an excellent effect of being able to control how the lower end portion of the door inner panel is turned up.

  The side door structure of an automobile according to the present invention described in claim 3 clarifies the folding direction of the lower end portion of the door inner panel starting from the fragile portion, and further improves the load transmission performance of the door inner panel to the vehicle body frame member. It has an excellent effect that it can be further improved.

  The side door structure of an automobile according to the present invention described in claim 4 has an excellent effect that simplification of the structure of the door inner panel and reduction of the cost can be achieved.

It is a side view which expands and shows the center pillar lower vicinity of the vehicle body to which the side door structure of the motor vehicle concerning this embodiment was applied. It is a longitudinal cross-sectional view which shows the state cut | disconnected along 2-2 line | wire of FIG. It is a principal part expanded side view of FIG. 1 which expands and shows the principal part of this embodiment shown by FIG. It is a principal part expanded side view corresponding to FIG. 1 which shows the state of a collision initial stage. FIG. 5 is an enlarged side view of a main part corresponding to FIG. 2, showing a state in which the door has further entered from the state shown in FIG. 4. It is a side view of the vehicle body side part which shows the periphery structure of a door opening part.

  Hereinafter, an embodiment of an automobile side door structure according to the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in each figure indicates the vehicle front side, and an arrow UP indicates the vehicle upper side. Furthermore, the arrow IN indicates the inner side in the vehicle width direction.

  FIG. 6 shows, as an example, a schematic side view of the side of the vehicle body with the side door of a luxury coupe car removed. As shown in this figure, a substantially rectangular door opening 22 surrounded by a front pillar 12, a center pillar 14, a roof side rail 18 and a rocker 20 is formed in the vehicle side portion 10. The front pillar 12 and the center pillar 14 are columnar vehicle body skeleton members that are erected substantially along the vehicle vertical direction. Moreover, the roof side rail 18 is a vehicle body skeleton member disposed along the vehicle front-rear direction on both sides of the vehicle roof portion in the vehicle width direction. Further, the rocker 20 is a vehicle body skeleton member disposed along the vehicle front-rear direction on both sides of the vehicle floor portion in the vehicle width direction. The door opening 22 surrounded by the vehicle body skeleton members is opened and closed by a side door 24.

  As shown in FIGS. 1 and 2, the side door 24 includes a door outer panel 26 that is disposed outside the vehicle compartment and forms a door outer plate, and a door inner panel that is disposed on the vehicle interior side and forms a door inner plate. 28, and a side door main body 30 disposed adjacent to the center pillar 14 and the rocker 20 is provided.

  On the other hand, the rocker 20 includes a rocker outer panel 32 having a hat-shaped cross section disposed outside the vehicle compartment, and a rocker inner panel 34 having a hat-shaped cross section disposed on the vehicle interior side. The rocker 20 has a closed cross-sectional structure by spot welding the upper end flange portion 32A and the lower end flange portion 32B of the rocker outer panel 32 and the upper end flange portion 34A and the lower end flange portion 34B of the rocker inner panel 34. A reinforcement 36 (see FIG. 2) having a U-shaped cross section is disposed on the inner side in the vehicle width direction of the vertical wall portion 32C of the rocker outer panel 32.

  Further, the center pillar 14 includes a center pillar outer panel 38 that has a hat-shaped flat cross-sectional shape and is disposed outside the vehicle compartment, and a center pillar inner panel (not shown) that has the same flat cross-sectional shape and is disposed on the vehicle interior side. It is equipped with. The center pillar 14 has a closed cross-sectional structure by spot-welding the front and rear flange portions of the center pillar outer panel 38 and the center pillar inner panel. The upper end of the center pillar 14 is joined to the roof side rail 18, and the lower end of the center pillar 14 is joined to the rocker 20.

  The above-described center pillar outer panel 38 is formed in a substantially I shape in a vehicle side view. More specifically, the front end edge 38C from the lower portion 38A to the base 38B in the center pillar outer panel 38 extends in a hem-like shape in a vehicle side view. The lower end of the base 38B is spot welded so as to overlap the surface of the vertical wall 32C of the rocker outer panel 32 on the outer side in the vehicle width direction.

  Here, as shown in FIGS. 1 to 3, when the side door 24 is closed as viewed from the side of the vehicle, the rear end portion 28 </ b> A of the door inner panel 28 is the front portion of the center pillar outer panel 38 described above. Arranged to polymerize with 38D. Further, the lower end portion 28 </ b> B of the door inner panel 28 is arranged so as to overlap with the upper portion of the vertical wall portion 32 </ b> C of the rocker outer panel 32.

  Further, the lower end portion 28B of the door inner panel 28 arranged so as to partially overlap the center pillar outer panel 38 and the rocker outer panel 32 has a folding direction of the small hole 40 as the weak portion and the lower end portion 28B of the door inner panel 28. And a bead 42 that defines The small hole 40 is set at a position facing the upper portion of the rocker outer panel 32 in the vehicle width direction and spaced from the front end of the root 38B of the center pillar outer panel 38 by a predetermined distance from the front side of the vehicle. The small hole 40 is used as a drain hole as well as the drain hole 43 formed near the rear end of the lower end 28B of the door inner panel 28. On the other hand, the bead 42 is formed linearly along the vehicle width direction when viewed in a plan view. The bead 42 is a groove-shaped bead that is recessed toward the door outer panel 26. Further, the bead 42 is set between the small hole 40 which is a fragile portion and the root 38 </ b> B of the center pillar outer panel 38 and inside the small hole 40 in the vehicle width direction.

  Further, the upper end flange portion 32A of the rocker outer panel 32 and the upper end flange portion 34A of the rocker inner panel 34 are integrally formed with a protruding portion 44 that protrudes toward the vehicle upper side close to the front end of the root 38B of the center pillar outer panel 38. ing. The protruding portion 44 protrudes so as to be opposed to the extending direction of the front end edge 38C of the lower portion 38A of the center pillar outer panel 38 with a gap 46 therebetween. Further, the small hole 40 and the bead 42 are arranged on the same straight line in the direction P connecting the front end upper corner portion 38B 'of the base 38B of the center pillar outer panel 38 and the tip end portion 44A of the protruding portion 44.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  The state shown in FIG. 3 is the state before the side collision. When a side collision occurs from this state, a collision load is first input to the door outer panel 26 of the side door 24. Next, the door outer panel 26 is pushed and the lower end 28 </ b> B of the door inner panel 28 comes into contact with the upper portion of the rocker outer panel 32. As a result, as shown in FIG. 4, the small hole 40 formed in the lower end portion 28 </ b> B of the door inner panel 28 is deformed as a folding start point for turning up the door inner panel 28. When the intrusion of the side door 24 further proceeds, the door inner panel 28 is deformed as shown in FIG. That is, when the small hole 40 starts to be bent and the lower end portion 28B of the door inner panel 28 starts to be turned up, the vehicle is located between the small hole 40 and the center pillar outer panel 38 more than the small hole 40 as shown in FIG. The bending deformation proceeds toward the bead 42 set on the inner side in the width direction. That is, the bending deformation starting from the small hole 40 proceeds in the direction in which the bead 42 is provided (rear side of the vehicle with respect to the small hole 40), and the direction in which the bead 42 is not provided (based on the small hole 40). Will not proceed to the front of the vehicle. Thereby, the turning-up deformation of the lower end portion 28B of the door inner panel 28 is suppressed (that is, the timing at which the lower end portion 28B of the door inner panel 28 is turned up is delayed), and the lower end portion 28B of the door inner panel 28 and the center pillar are correspondingly reduced. The lap allowance with the outer panel 38 and the rocker outer panel 32 can be ensured. As a result, a large amount of collision load at the time of a side collision is transmitted to the vehicle body skeleton members such as the center pillar 14 and the rocker 20. In other words, when the positions of the small holes 40 and the beads 42 are moved away from the center pillar 14, the timing for increasing the load on the center pillar 14 can be delayed. Conversely, when the positions of the small holes 40 and the beads 42 are brought closer to the center pillar 14, the timing for increasing the load on the center pillar 14 can be advanced.

  In addition, in the present embodiment, the load transmission performance is not secured by using another component such as an impact beam or an extension as in the prior art, but the load transmission performance is secured by the shape of the door inner panel 28 itself. For this reason, the number of parts is reduced.

  As described above, according to the present embodiment, the load transmission performance from the lower end portion 28B of the door inner panel 28 to the vehicle body skeleton member can be improved at the time of a side collision, and the cost and weight can be reduced.

  Further, in the present embodiment, the upper flange portion 32A of the rocker outer panel 32 and the upper flange portion 34A of the rocker inner panel 34 are formed with protruding portions 44 that protrude upward in the vehicle. The projecting portion 44 is disposed so as to face the front end edge 38C from the lower portion 38A of the center pillar outer panel 38 toward the root 38B with a gap 46 therebetween. Further, the small hole 40 and the bead 42 described above are arranged on the same straight line in a direction P connecting the front end upper corner portion 38B 'of the base 38B of the center pillar outer panel 38 and the tip end portion 44A of the protruding portion 44. That is, the front end upper corner portion 38B ′ of the base 38B of the center pillar outer panel 38, the tip end portion 44A of the projecting portion 44 (that is, the gap 46 therebetween), the small hole 40, and the bead 42 are arranged in the same direction (on a straight line). The For this reason, the places where the strength changes are arranged in the same direction (on a straight line), and a broken line of the lower end portion 28B of the door inner panel 28 is easily formed on the direction P. Overall, the locations where the strength changes are arranged in a straight line so that a fold line of the lower end portion 28B of the door inner panel 28 is easily formed in that direction, while the progress of the fold deformation is stopped by the bead 42, The turn-up of the lower end portion 28B of the panel 28 is suppressed. As a result, according to the present embodiment, the folding direction of the lower end portion 28B of the door inner panel 28 starting from the small hole 40 is clarified, and the vehicle body frame member such as the center pillar 14 and the rocker 20 of the door inner panel 28 is defined. The load transmission performance can be further improved.

  Moreover, in this embodiment, since the small hole 40 formed in the lower end part 28B of the door inner panel 28 is used as a drain hole, two functions can be given to one structure. For this reason, it is not necessary to newly set the small hole 40 separately from the drain hole. As a result, according to the present embodiment, the structure of the door inner panel 28 can be simplified and the cost can be reduced.

[Supplementary explanation of the above embodiment]
In the above-described embodiment, the small hole 40 as the weak portion is formed in the lower end portion 28B of the door inner panel 28 only at one place. Also good. For example, in addition to the small hole 40 described above as shown by a two-dot chain line in FIG. 1, a small hole 50 may be additionally set at a position separated by a predetermined distance on the vehicle front side. According to this configuration, since the small holes 40 are set at a plurality of locations (two locations) in the vehicle longitudinal direction, the lower end portion 28B of the door inner panel 28 is compared with the case where the small holes 40 are set at one location. Rolling up is suppressed. In this way, by changing the number and positions of the weak portions such as the small holes 40, it is possible to change how the lower end portion 28B of the door inner panel 28 is turned up. As a result, it is possible to control how the lower end portion 28B of the door inner panel 28 is turned up.

  In the above-described embodiment, the small hole 40 is used as the fragile portion. However, the present invention is not limited to this, and other configurations may be used.

  Furthermore, in the above-described embodiment, the present invention is applied to the side door of a luxury coupe car. However, the present invention is not limited to this, and the present invention may be applied to other types of vehicles. For example, the present invention may be applied to a four-door sedan vehicle. In that case, since it is most effective to apply the present invention to the front side door, the present invention may be applied only to the front side door, but the present invention is also applied to the rear side door. There is no problem.

14 Center pillar (pillar)
20 Rocker 24 Side door 26 Door outer panel 28 Door inner panel 28B Lower end 30 Side door body 32A Upper end flange (flange)
34A Top flange (flange)
38A Lower part 38B Root 38B 'Front end upper corner part 38C Front end edge 40 Small hole (fragile part)
42 Bead 44 Projection 44A Tip 46 Gap 50 Small hole (fragile part)

Claims (4)

A side door body portion that is configured to include a door outer panel disposed outside the vehicle compartment and a door inner panel disposed on the vehicle interior side, and disposed adjacent to the pillar and the rocker;
A fragile portion that is a lower end portion of the door inner panel, is opposed to the upper portion of the rocker in the vehicle width direction, and is set at a predetermined distance from the base of the pillar in the vehicle front-rear direction;
The door than the fragile portion between said weakened portion and a lower portion of the inner panel and the pillar is set in the vehicle width direction inside and the vehicle upper side, the lower end portion of the door inner panel as a starting point the fragile portion A bead that defines the folding direction of the
A side door structure of an automobile having The fragile portion is set at a plurality of locations in the vehicle longitudinal direction,
The side door structure for an automobile according to claim 1. The pillar is a center pillar in which a front edge extending from the lower part toward the base extends in a hem-spread shape in a side view of the vehicle,
On the other hand, a flange portion is formed on the upper end portion of the rocker along the longitudinal direction of the vehicle, and the flange portion projects so as to face the flange portion in the extending direction of the front end edge of the lower portion of the center pillar. Formed protrusions,
Further, the weakened portion and the bead are arranged in a direction connecting the upper corner portion of the front end of the center pillar and the tip portion of the protruding portion,
The side door structure for an automobile according to claim 1 or 2. The fragile portion is a drain hole formed in a lower end portion of the door inner panel.
The side door structure for an automobile according to any one of claims 1 to 3.

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