JP6966297B2 - Body structure - Google Patents

Description

The present invention relates to a vehicle body structure including a reinforcement panel arranged on a closed cross section of pillars extending in the vertical direction and having an upper panel and a lower panel thinner than the upper panel, which are joined by welding at the end faces of each other.

A vehicle center pillar reinforcing structure in which a reinforcement panel is arranged between an outer panel and an inner panel of a center pillar extending in the vertical direction to form a trailing edge of a front door opening is known (see, for example, Patent Document 1). ). In the vehicle body structure described in Patent Document 1, the reinforcement panel is a tailored blank composed of an upper panel and a lower panel thinner than this, the joint portion between the upper panel and the lower panel is located lower than the belt line, and the joint portion is located in the front door in the front-rear direction. The rear end of the door beam arranged toward the joint is located near the lower side of the joint.

Japanese Unexamined Patent Publication No. 2000-85620

However, in the vehicle body structure described in Patent Document 1, at the time of a side collision, all the load from the door beam side is transmitted to the lower panel having a relatively low strength, so that the amount of the colliding object entering the vehicle interior side may increase. be.
Here, in order to reduce the amount of the collision object entering the vehicle interior side, it is conceivable to configure the load from the door beam side to be transmitted to the upper panel having a relatively high strength. However, fragile parts such as holes are often formed in the upper panel, and when a load is transmitted to the upper panel, the upper panel is deformed starting from the fragile part. It is not possible to set the deformation mode to bend, and there is a risk that the amount of intrusion will increase.

The present invention has been made in view of the above circumstances, and an object of the present invention is to maintain a deformation mode in which the vicinity of the joint between the upper panel and the lower panel of the reinforcement panel is bent at the time of a side collision, and the vehicle is a collision object. The purpose of the present invention is to provide a vehicle body structure capable of reducing the amount of intrusion into the interior side.

In order to achieve the above object, according to the present invention, an upper panel arranged on a closed cross section of pillars extending in the vertical direction and joined by welding at the end faces of each other, a reinforcement panel having a lower panel thinner than the upper panel, and the inside of a door. The door beam is arranged so as to extend in the front-rear direction and is located outside the pillar in the vehicle width direction in the front view, and the door beam is arranged so that one end side overlaps with the upper panel in the side view. Provided a vehicle body structure having a fragile portion arranged apart from the door beam in a side view, and the upper panel having a bead covering the outside of the fragile portion on the door beam side in a side view. NS.

According to this vehicle body structure, when the door beam moves inward in the vehicle width direction at the time of a side collision, a load is applied to the upper panel of the reinforcement panel from the door beam side. At this time, although the fragile part of the upper panel is easily deformed, since the outside of the fragile part on the door beam side is covered with a bead, it is difficult for the load from the door beam side to be transmitted to the fragile part, and the deformation of the fragile part is suppressed. .. Then, the load from the door beam side is transmitted to the joint portion between the upper panel and the lower panel, and a deformation mode in which the vicinity of the joint portion between the upper panel and the lower panel is bent is realized.
In addition, since the upper panel is thicker than the lower panel, it is stronger than the lower panel as a whole, and the amount of collisions entering the vehicle interior side is reduced as compared with the case where all the load from the door beam side is transmitted to the lower panel. Can be done.
Further, the deformation of the fragile portion can be suppressed without adding a reinforcing member or the like around the fragile portion of the upper panel, and the weight and cost do not increase.

In the vehicle body structure, a second door beam that is arranged below the door beam inside the door, extends in the front-rear direction, and is located outside the pillar in the vehicle width direction in the front view is provided, and the second door beam is viewed from the side. The one end side may be arranged so as to overlap the lower panel.

According to this vehicle body structure, a load is applied to the upper panel from the door beam side at the time of a side collision, while a load is applied to the lower panel from the second door beam side. As a result, the load from the door side can be distributed and transmitted to the upper panel and the lower panel of the reinforcement panel, and the load is not concentrated on either the upper or lower panel.

In the vehicle body structure, the pillar is a center pillar forming a rear portion of the front door opening, and the door beam and the second door beam may be arranged inside the front door.

According to this vehicle body structure, when a load is applied to the center pillar from the rear end side of the front door beam and the second door beam at the time of a side collision, the deformation mode of the center pillar can be accurately controlled.

In the vehicle body structure, the upper panel may have a ridge line extending in the vertical direction behind the fragile portion, and the rear end of the bead may be arranged in front of the ridge line.

According to this vehicle body structure, the ridgeline of the upper panel is not cut by the bead, and the strength and rigidity of the entire center pillar are not reduced.

In the vehicle body structure, the fragile portion may be a hole portion.

According to this vehicle body structure, a harness or the like can be inserted into the reinforcement panel by using the hole portion of the upper panel, and the weight of the upper panel can be reduced.

In the vehicle body structure, the bead may be formed above the center line of the door beam.

According to this vehicle body structure, when the door beam moves inward in the vehicle width direction at the time of a side collision, the entire bead is interposed between the fragile portion and the door beam, and the load from the door beam side is efficiently transmitted to the fragile portion. It can be suppressed.

In the vehicle body structure, the bead may have an equidistant section having a substantially constant distance from the fragile portion at the outer edge on the fragile portion side.

According to this body structure, since the distance between the outer edge of the bead and the fragile part is substantially constant, it is not easy for the load to be transmitted from the specific part of the bead to the fragile part, and the deformation of the fragile part is effectively suppressed. Will be done.

According to the present invention, it is possible to reduce the amount of the colliding object invading the vehicle interior side while maintaining the deformation mode in which the vicinity of the joint between the upper panel and the lower panel of the reinforcement panel is bent at the time of a side collision.

It is a schematic side view of the vehicle body structure which shows one Embodiment of this invention. It is a side view of a reinforcement panel. It is a plan sectional view of a center pillar. It is a front schematic explanatory view which shows the positional relationship between a reinforcement panel and a door beam. It is a front schematic explanatory view which shows the movement of a door beam at the time of a side collision.

1 to 5 show an embodiment of the present invention, FIG. 1 is a schematic side view of a vehicle body structure, FIG. 2 is a side view of a reinforcement panel, FIG. 3 is a plan sectional view of a center pillar, and FIG. Is a schematic front explanatory view showing the positional relationship between the reinforcement panel and the door beam, and FIG. 5 is a schematic front explanatory view showing the movement of the door beam at the time of a side collision.

As shown in FIG. 1, the vehicle body 1 is configured by, for example, assembling panel-shaped members obtained by press-molding a steel plate and joining them by spot welding or the like. The vehicle body 1 has a pair of left and right center pillars 10 extending in the vertical direction, a pair of left and right side sills 20 connected to the lower end side of the center pillar 10 and extending in the front-rear direction, and left and right connected to the upper end side of the center pillar 10 and extending in the front-rear direction. It includes a pair of roof side rails 30 and.

The center pillar 10 forms the rear part of the front door opening, and a door beam extending in the front-rear direction and located outside the center pillar 10 in the vehicle width direction is arranged inside the front door. In the present embodiment, two door beams, an upper beam 41 and a lower beam 42, are arranged inside the front door. The center pillar 10 is formed so that the cross section in a plan view is a closed cross section, and the reinforcement panel 13 is arranged on the closed cross section. Further, the side sill 20 and the roof side rail 30 are each formed so that the cross section in front view is a closed cross section.

As shown in FIG. 2, the reinforcement panel 13 is a so-called tailored blank, and has an upper panel 14 which is welded to each other and a lower panel 15 which is thinner than the upper panel 14. The reinforcement panel 13 has a substantially inverted T shape as a whole, the lower lower panel 15 is formed in a three-pronged shape extending in the left-right direction and the upper direction, and the upper upper panel 14 is formed so as to extend upward from the upper end of the lower panel 15. .. In the present embodiment, the lower end surface of the upper panel 14 and the upper end surface of the lower panel 15 are joined by plasma welding, and weld beads are formed at the joint portions of the panels 14 and 15. In the present embodiment, the boundary portion between the upper panel 14 and the lower panel 15 is set lower than the waist portion of the occupant.

The upper beam 41 and the lower beam 42 extend in the front-rear direction and are located outside the center pillar 10 in the vehicle width direction in a front view. The upper beam 41 is arranged so that the rear end side overlaps with the upper panel 14 in a side view. Further, the lower beam 42 is arranged so that the rear end side overlaps with the lower panel 15 in a side view.

The upper panel 14 has a front flange portion 14a, a first inclined portion 14b, a first flat portion 14c, a second inclined portion 14d, a second flat portion 14e, a third inclined portion 14f, and a rear flange portion from the front side to the rear. It has 14 g in this order. The front flange portion 14a and the rear flange portion 14g are formed substantially flat and are connected to the inner panel 11 and the outer panel 12, which will be described later. The first inclined portion 14b inclines outward in the vehicle width direction toward the rear. The first flat portion 14c occupies most of the upper panel 14 in a side view and is formed substantially flat. The second inclined portion 14d inclines outward in the vehicle width direction toward the rear. The second flat portion 14e is located on the outermost side in the vehicle width direction of the upper panel 14, and is formed substantially flat. In the present embodiment, the second flat portion 14e forms a ridge line extending in the vertical direction in the upper panel 14. The third inclined portion 14f inclines inward in the vehicle width direction toward the rear.

The upper panel 14 has a hole portion 16 as a fragile portion formed in the first flat portion 14c. A second flat portion 14e forming a ridgeline extending in the vertical direction is located behind the hole portion 16. In the present embodiment, the hole 16 is formed vertically and a harness is inserted through the hole 16. Further, the hole portion 16 reduces the weight of the upper panel 14. The hole 16 is arranged apart from the upper beam 41 in a side view. In the present embodiment, the rear end of the upper beam 41 is located obliquely downward in front of the hole 16 in a side view.

Further, the upper panel 14 has a bead 17 formed on the first flat portion 14c. The rear end of the bead 17 is located in front of the second flat portion 14e forming a ridgeline extending in the vertical direction. As a result, the ridgeline of the upper panel 14 is not cut off by the bead 17, and the strength and rigidity of the entire center pillar 10 are not reduced.

The bead 17 covers the outside of the hole 16 on the upper beam 41 side in a side view. That is, in the present embodiment, the bead 17 is formed on the front diagonally lower side of the hole 16 in a side view. The bead 17 is formed so as to be convex toward the outside in the vehicle width direction, and is formed above the center line 41a of the upper beam 41. The bead 17 has an equidistant section 17a at the outer edge on the side of the hole 16 at a substantially constant distance from the hole 16.

The upper end side of the lower panel 15 is continuously formed with the upper panel 14, and the lower panel 15 has a front flange portion 15a, a first inclined portion 15b, a first flat portion 15c, and a second from the front side to the rear side like the upper panel 14. It has an inclined portion 15d, a second flat portion 15e, a third inclined portion 15f, and a rear flange portion 15g in this order. The front flange portion 15a and the first inclined portion 15b extend obliquely downward from the upper end to the front end of the lower panel 15. On the other hand, the second inclined portion 15d, the second flat portion 15e, the third inclined portion 15f, and the rear flange portion 15g extend diagonally rearward from the upper end to the rear end of the lower panel 15.

Further, the lower panel 15 has a lower flange portion 15i and a fourth inclined portion 15h in this order from the lower side to the upper side on the lower end side thereof. The lower flange portion 15i is formed substantially flat and is connected to the side sill 20. The fourth inclined portion 15h is inclined outward in the vehicle width direction toward the upper side. The upper end of the fourth inclined portion 15h is connected to the lower end of the first flat portion 15c.

As shown in FIG. 3, the center pillar 10 has an inner panel 11 located inside in the vehicle width direction and an outer panel 12 located outside in the vehicle width direction. The inner panel 11 has a front flange portion 11a, a first inclined portion 11b, a flat portion 11c, a second inclined portion 11d, and a rear flange portion 11e in this order from the front side to the rear side. The front flange portion 11a and the rear flange portion 11e are formed substantially flat, and are joined to the front flange portion 14a of the upper panel 14 by spot welding. The first inclined portion 11b inclines inward in the vehicle width direction toward the rear. The flat portion 11c occupies most of the inner panel 11 in the side view and is formed substantially flat. The second inclined portion 11d inclines outward in the vehicle width direction toward the rear.

On the other hand, the outer panel 12 has a front flange portion 12a, a first inclined portion 12b, a flat portion 12c, a second inclined portion 12d, and a rear flange portion 12e in this order from the front side to the rear side. The front flange portion 12a and the rear flange portion 12e are formed substantially flat, and are joined to the front flange portion 14a of the upper panel 14 by spot welding. The first inclined portion 12b inclines outward in the vehicle width direction toward the rear. The flat portion 12c occupies most of the outer panel 12 in a side view and is formed substantially flat. The second inclined portion 12d inclines outward in the vehicle width direction toward the rear.

According to the vehicle body structure configured as described above, as shown in FIG. 4, the upper beam 41 is located outside the bead 17 of the upper panel 14 of the reinforcement panel 13 in the vehicle width direction via the door panel 40 and the outer panel 12. doing. Then, as shown in FIG. 5, when the upper beam 41 moves inward in the vehicle width direction at the time of a side collision, a load is applied to the upper panel 14 of the reinforcement panel 13 from the upper beam 41 side. Specifically, the rear end side of the upper beam 41 presses the front lower side of the bead 17 on the upper panel 14 inward in the vehicle width direction.

At this time, although the hole 16 of the upper panel 14 is relatively fragile and easily deformed, the load from the upper beam 41 side is covered by the bead 17 on the outside of the hole 16 on the upper beam 41 side. It is difficult to transmit to, and the deformation of the hole 16 is suppressed. Then, the load from the upper beam 41 side is transmitted to the joint portion between the upper panel 14 and the lower panel 15, and a deformation mode is realized in which the vicinity of the joint portion between the upper panel 14 and the lower panel 15 is bent. Therefore, when a load is applied to the center pillar 10 from the rear end side of the upper beam 41 and the lower beam 42 of the front door at the time of a side collision, the deformation mode of the center pillar 10 can be accurately controlled.
Further, since the upper panel 14 is thicker than the lower panel 15, the strength is higher than that of the lower panel 15 as a whole, and the amount of collisions entering the vehicle interior side is larger than that in the case where all the load from the door beam side is transmitted to the lower panel 15. Can be reduced.
Further, the deformation of the hole 16 can be suppressed without adding a reinforcing member or the like around the hole 16 of the upper panel 14, and the weight and cost are not increased.

In the present embodiment, the bead 17 is set to be above the center line 41a of the upper beam 41 in the side view. Therefore, when the upper beam 41 moves inward in the vehicle width direction at the time of a side collision, the entire bead 17 is a hole. Since it is interposed between the portion 16 and the upper beam 41, it is possible to efficiently suppress the transmission of the load from the upper beam 41 side to the fragile portion. Further, since the distance between the outer edge of the bead 17 and the hole 16 is substantially constant, it is not easy for the load to be transmitted from the specific portion of the bead 17 to the hole 16, and the deformation of the fragile portion is effectively suppressed. NS.

In this way, the load is applied to the upper panel 14 from the upper beam 41 side at the time of a side collision, while the load is applied to the lower panel 15 from the lower beam 42 side. As a result, the load from the front door side can be distributed and transmitted to the upper panel 14 and the lower panel 15 of the reinforcement panel 13, and the load is not concentrated on either the upper or lower panel.

In the above embodiment, an example in which the present invention is applied to the center pillar 10 is shown, but it goes without saying that the present invention may be applied to the front pillar and the rear pillar. Further, although an example in which the present invention is applied to the rear end side of the door beam of the front door is shown, it can be applied to either the front door or the rear door as long as the door beam is arranged, and the front end side of the door beam can be applied. It can be applied to either the rear end side or the rear end side. Further, although two door beams, an upper beam 41 and a lower beam 42, are shown to be arranged inside the door, if at least one end side of the door beam overlaps with the upper panel in a side view, they are arranged inside the door. The number of door beams may be one or three or more.

Further, in the above-described embodiment, the hole portion 16 is formed as a fragile portion, but if a portion of the upper panel 14 that is more vulnerable than other portions is formed, such as a bent portion, The present invention can be applied to this vulnerable part.

Further, in the above-described embodiment, the bead 17 is generally formed above the center line 41a of the upper beam 41, but at least a part of the bead 17 is above the center line 41a of the upper beam 41. If there is, the deformation suppressing effect of the hole portion 16 can be obtained. Further, the bead 17 does not necessarily have the equidistant section 17a, and the shape of the bead 17 can be appropriately changed as needed.

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

1 Body 10 Center pillar 11 Inner panel 12 Outer panel 13 Reinforce panel 14 Upper panel 14e Second flat part 15 Lower panel 16 Hole 17 Bead 17a Equidistant section 41 Upper beam 41a Center line 42 Lower beam

Claims (7)

Reinforce panels arranged on a closed cross section of pillars extending in the vertical direction and having an upper panel and a lower panel thinner than the upper panel, which are joined by welding at the end faces of each other.
It is equipped with a door beam that is arranged inside the door, extends in the front-rear direction, and is located outside the pillar in the vehicle width direction when viewed from the front.
The door beam is arranged so that one end side overlaps with the upper panel in a side view.
The upper panel has a fragile portion arranged apart from the door beam in a side view.
The upper panel is viewed from the side, it has a bead covering the outside of the door beam side of the weak portion,
The bead has a vehicle body structure that does not overlap with the door beam when viewed from the side. It is provided with a second door beam that is arranged below the door beam inside the door, extends in the front-rear direction, and is located outside the pillar in the vehicle width direction in a front view.
The vehicle body structure according to claim 1, wherein the second door beam is arranged so that one end side overlaps with the lower panel in a side view. The pillar is a center pillar forming the rear part of the front door opening.
The vehicle body structure according to claim 1 or 2, wherein the door beam and the second door beam are arranged inside the front door. The upper panel has a ridge line extending in the vertical direction behind the fragile portion.
The vehicle body structure according to any one of claims 1 to 3, wherein the rear end of the bead is arranged on the front side of the ridgeline. The vehicle body structure according to any one of claims 1 to 4, wherein the fragile portion is a hole portion. The vehicle body structure according to any one of claims 1 to 5, wherein the bead is formed above the center line of the door beam. The vehicle body structure according to claim 6, wherein the bead has an equidistant section having a substantially constant distance from the fragile portion at the outer edge on the fragile portion side.

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