JP2022165692A - Lower body structure of vehicle - Google Patents

Abstract

To provide a side body structure of a vehicle, capable of well executing spot welding of single faces of a side sill and a side sill outer without suppressing deformation of the side sill outer during welding.SOLUTION: A side body structure includes a side panel 5 arranged outside of a side sill 4 in the vehicle width direction. Ridge lines 58 of front side and rear side of a welding seating face 53 of the side panel 5 are formed so that a curvature radius increases as they approach a welding part 54 from the top end side to the lower end side and a mutual interval in the cross direction spreads as they approach the welding part 54, and the welding part 54 is arranged more downward than a bead 55 adjacent to the welding seating face 53.SELECTED DRAWING: Figure 4

Description

The present invention relates to a vehicle side body structure in which a side panel is joined to an outer panel of a side sill.

In a vehicle such as an automobile, a side sill extending in the front-rear direction and having a closed cross-section is arranged on the outer end side in the vehicle width direction (see, for example, Patent Document 1). A pillar or the like having a closed cross section is connected to the side sill. In the vehicle body structure of Patent Document 1, the side sill reinforcement and the center pillar reinforcement are joined by spot welding.

JP 2016-94089 A

Incidentally, there is a case where a side panel is spot-welded to a side sill having a closed cross section from the outside of the closed cross section in the vehicle width direction. In this case, since the side panel and the side sill outer are welded by single-sided spot welding, the welding gun is brought into contact with the side panel from the outside in the vehicle width direction. Since the side panels and the side sill outers need to be pressurized during spot welding, a relatively large force is applied to the side panels and the side sill outers from the welding gun toward the inside in the vehicle width direction. In single-sided spot welding, the deformation of the member on the opposite side of the welding gun is usually suppressed, but if the shape, plate thickness, material, etc. of the side sill outer are selected to suppress deformation during welding, , side collision performance, running performance, and other performances required for the vehicle may be impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to achieve good single-sided spot welding of a side sill and a side sill outer without suppressing deformation of the side sill outer during welding. To provide a side body structure of a vehicle capable of

According to the present invention, the side body structure of a vehicle includes a side sill that extends in the front-rear direction and has an inner panel and an outer panel that form a closed cross section, and a side panel that is arranged outside the side sill in the vehicle width direction. The side panel is formed to include a flat general surface forming a lower end side of the side panel and a lower end of the side panel via an inclined surface on the general surface, and is formed from the general surface in the vehicle width direction. a welded bearing surface positioned inside and including a welded portion to be welded to the outer panel of the side sill; The weld portion of the weld bearing surface is arranged below each bead, and the front and rear outer ridges of the weld bearing surface formed by the general surface and the inclined surface each extend downward. The vehicle is curved in a concave shape, and the radius of curvature increases from the upper end side to the lower end side as it approaches the welded portion, and the distance between them in the front-rear direction increases as the welded portion is approached. A side body structure is provided.

According to this vehicle side body structure, each bead formed on the general surface of the side panel improves the rigidity of the general surface as a whole and suppresses deformation of the general surface. On the other hand, each ridgeline is formed so that the radius of curvature increases as it approaches the welded portion toward the bottom, and the distance between the ridges in the front-rear direction increases. Low stiffness. In addition, the welds are located below each bead where they have little stiffening effect. As a result, the welded portion on the weld bearing surface has relatively low rigidity and is easily deformed.
When the side panel and the side sill outer are spot-welded on one side, the side panel and the side sill outer are pressurized by bringing the welding gun into contact with the welding bearing surface of the side panel from the outside in the vehicle width direction. At this time, a relatively large force is applied to the side panel and the side sill outer from the welding gun toward the inside in the vehicle width direction. Overall deformation is suppressed. On the other hand, since the welded portion is relatively easily deformed on the welding bearing surface, it is allowed to deform inward in the vehicle width direction at the time of contact with the welding gun. As a result, when a relatively large force is applied to the side panel and the side sill outer from the welding gun toward the inside in the vehicle width direction during welding, the welded portion of the side panel can be deformed following the side sill outer.

In the vehicle side body structure described above, the widthwise dimension of each of the inclined surfaces on the front side and the rear side of the welded seating surface may increase toward a lower end thereof.

According to this vehicle side body structure, the width dimension of each inclined surface increases as it approaches the lower end, so that the rigidity of the welded seat surface is lower at the lower end than at the upper end. .

Further, in the vehicle side body structure, a plurality of pillars extending upward from the side sill are arranged at intervals in the front-rear direction, and the side panel has an upper end side at a predetermined position in the front-rear direction that partially covers at least one of the pillars. can be omitted.

According to this vehicle side body structure, the panel forming part of the pillar is joined to the side sill outer as the side panel.

Further, in the vehicle side body structure described above, the side panel may have a lower end side extending in the front-rear direction along the side sill, and a plurality of the welded seat surfaces may be formed at intervals in the front-rear direction.

According to this vehicle side body structure, the lower end side of the side panel is joined to the side sill by single-sided spot welding at a plurality of locations in the front-rear direction.

According to the vehicle side body structure of the present invention, one-sided spot welding of the side sill and the side sill outer can be favorably performed without suppressing deformation of the side sill outer during welding.

1 is a side view of a vehicle showing an embodiment of the invention; FIG. 1 is a partial side view of a side body structure of a vehicle; FIG. 1 is a cross-sectional view of a side body structure of a vehicle; FIG. FIG. 2 is a partially enlarged side view of the side body structure of the vehicle;

1 to 4 show an embodiment of the present invention, FIG. 1 is a side view of a vehicle, FIG. 2 is a partial side view of a side body structure of the vehicle, and FIG. 3 is a side body structure of the vehicle. , and FIG. 4 is a partially enlarged side view of the side body structure of the vehicle.

As shown in FIG. 1, the side body structure of the vehicle 1 has fender panels 20, 30 forming outer plates, and a plurality of pillars 2, 2 extending vertically inside the fender panels 20, 30 in the vehicle width direction. 3 (see FIG. 2) are arranged. Each pillar 2, 3 forms a frame of the vehicle body, and forms a closed cross section with an inner panel and an outer panel.

As shown in FIG. 2, the pillars 2 and 3 are spaced apart in the front-rear direction and formed to extend upward from side sills 4 extending in the front-rear direction. As shown in FIG. 3 , the side sill 4 has a closed cross section formed by a side sill inner 41 and a side sill outer 42 . In this embodiment, the side sill 4 has a reinforcement panel 43 that partitions the closed cross section in the vehicle width direction. In this embodiment, the side sill 4 and the side panel 5 are made of steel plates and are joined by spot welding.

As shown in FIG. 2 , the side panels 5 have upper ends on both front and rear ends forming outer panels of the pillars 2 and 3 , and lower ends on the central side in the front and rear direction outside the side sills 4 in the vehicle width direction. As shown in FIG. 4, the side panel 5 includes a flat general surface 51 forming the lower end side and a welded portion 54 that is welded to a side sill outer 42 that is formed on the general surface 51 via an inclined surface 52. It has a surface 53 and a pair of beads 55 extending in the front-rear direction formed adjacent to the welding seat surface 53 on the general surface 51 and extending in the front-rear direction. As shown in FIG. 3 , the welding bearing surface 53 is located inside the general surface 51 in the vehicle width direction. Also, the welded portion of the side sill outer 42 is formed flat. In FIGS. 3 and 4, the welded portion 54 of the weld bearing surface 53 is shown by filling in the circle with the cross. As shown in FIG. 2, in the present embodiment, a plurality of welding seat surfaces 53 are formed at intervals in the front-rear direction.

As shown in FIG. 4 , the welded portion 54 of each weld seat 53 is positioned below each bead 55 . In addition, the lower side here means that at least a part of the welded portion 54 is lower than the lower end of the bead 55 . In this embodiment, almost the entire portion of the welded portion 54 is located below the lower end of the bead 55 , and the vertical center of the welded portion 54 is below the lower end of the bead 55 . In this embodiment, the lower end of the side panel 5 includes a horizontal portion 56 forming a lower end of a portion of the general portion 51 relatively distant from the welding seat surface 53, and an end of the horizontal portion 56 on the welding seat surface 53 side extending from the welding seat. and an inclined portion 57 extending inclined downward toward the front-rear center of the surface 53 . At the lower end of the side panel 5, the formation section of the inclined portion 57 protrudes downward from the horizontal portion 56, and the lower end side of the welded portion 54 is arranged in this projecting portion.

Further, in the present embodiment, the inclined surface 52 divides the general portion 51 and the welding bearing surface 53 vertically from the front side and the rear side of the welding bearing surface 53 . The front and rear outer ridgelines 58 of the welding bearing surface 53 formed by the general surface 51 and the inclined surface 52 are curved to be concave downward, and as they approach the welding portion 54 from the upper end side to the lower end side, It is formed to have a large radius of curvature. Also, the front and rear outer ridgelines 58 of the welding seat surface 53 are formed such that the distance between them in the front-rear direction widens from the upper end side to the lower end side as they approach the welded portion 54 . Front and rear inner ridgelines 59 of the welded seat surface 53 formed by the inclined surface 52 and the welded seat surface 53 are curved such that the upper end side is concave downward, and the lower end side extends vertically. The inclined surfaces 52 on the front and rear sides of the welding seat surface 53 are each formed such that the width dimension increases toward the lower end.

According to the side vehicle body structure configured as described above, each bead 55 formed on the general surface 51 of the side panel 5 improves the rigidity of the general surface 51 as a whole and suppresses deformation of the general surface 51. be done. On the other hand, each outer ridgeline 58 is formed such that the radius of curvature increases as it approaches the welded portion 54 downward, and the distance between them in the front-rear direction increases. The portion 54 is less rigid. In addition to this, the widthwise dimension of each inclined surface 52 increases as it approaches the lower end, so that the rigidity of the welded seat surface 53 is lower at the lower end than at the upper end. In addition, the welded portion 54 is positioned below each bead 55 where there is little effect of the rigidity enhancement due to each bead 55 . As a result, the welded portion 54 on the welded seat surface 53 has relatively low rigidity and is easily deformed.

As shown in FIG. 3, the side panel 5 and the side sill outer 42 are joined by spot welding on one side. During welding, the welding gun 100 is brought into contact with the welding seating surface 53 of the side panel 5 from the outside in the vehicle width direction to pressurize the side panel 5 and the side sill outer 42 . At this time, a relatively large force is applied to the side panel 5 and the side sill outer 42 from the welding gun 100 toward the inside in the vehicle width direction. Overall deformation of the lower end side of the panel 5 is suppressed. On the other hand, since the welded portion 54 is relatively easily deformed on the welding bearing surface 53 , it is allowed to deform inward in the vehicle width direction when it comes into contact with the welding gun 100 . As a result, when a relatively large force is applied to the side panel 5 and the side sill outer 42 from the welding gun 100 toward the inside in the vehicle width direction during welding, the welded portion 54 of the side panel 5 is deformed so as to follow the side sill outer 42. can be made

Therefore, one-sided spot welding of the side panel 5 and the side sill outer 42 can be favorably performed without suppressing deformation of the side sill outer 42 during welding. As a result, the side sill outer 42 can be designed without considering deformation during welding. That is, in single-sided spot welding, it is usually necessary to suppress the deformation of the side sill outer 42 on the opposite side of the welding gun 100, but by making the side panel 5 follow the deformation of the side sill outer 42, side collision performance and running performance are improved. It is possible to select the shape, plate thickness, material, etc. of the side sill outer 42 with priority given to performance and the like.

In the above embodiment, the two-door vehicle 1 is illustrated in FIG. 1, but it goes without saying that the present invention can be applied to other types of vehicles such as a four-door vehicle. Also, although a plurality of welding bearing surfaces 53 of the side panel 5 are formed at intervals in the front-rear direction, the number of welding bearing surfaces 53 may be one. Also, although the side panel 5 forms the outer panel of the front pillar 2 and the rear pillar 3, it may form the outer panel of either one of the pillars 2, 3, or may be provided independently of the pillar. It may have been

In the above-described embodiment, the inclined surface 52 divides the general portion 51 and the welding bearing surface 53 in the vertical direction. It can be anything. Also, although the inclined surface 52 is formed so that the width dimension increases as it approaches the lower end, if the amount of deformation inward in the vehicle width direction of the welded portion 54 during welding is ensured, it may be inclined, for example. The width dimension of the surface 52 may be constant.

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

2 front pillar 3 rear pillar 4 side sill 5 side panel 42 side sill outer 51 general surface 52 inclined surface 53 weld bearing surface 54 welded portion 55 bead 58 outer ridge

Claims (4)

a side sill extending in the front-rear direction and having an inner panel and an outer panel forming a closed cross section;
a side panel disposed outside the side sill in the vehicle width direction,
The side panel is
a flat general surface forming the lower end side of the side panel;
a welding bearing surface formed on the general surface including the lower end of the side panel via an inclined surface, positioned inside the general surface in the vehicle width direction, and including a weld portion to be welded to the outer panel of the side sill; ,
a pair of front and rear beads arranged adjacent to the welding bearing surface on the general surface and extending in the front and rear direction;
The weld portion of the weld bearing surface is arranged below each bead,
The ridgelines on the front and rear sides of the welding bearing surface formed by the general surface and the inclined surface are each curved downward to be concave, and the curvature increases from the upper end side to the lower end side as it approaches the welded portion. A side body structure of a vehicle formed so that the radius increases and the mutual distance in the front-rear direction widens as the welded portion is approached. 2. The side body structure of a vehicle according to claim 1, wherein said inclined surfaces on the front side and the rear side of said welded seating surface each increase in width dimension as they approach a lower end. A plurality of pillars extending upward from the side sill are arranged at intervals in the front-rear direction,
3. The side body structure of a vehicle according to claim 1, wherein the side panel has an upper end side at a predetermined position in the front-rear direction and forms a part of at least one of the pillars. 4. The side body of a vehicle according to any one of claims 1 to 3, wherein the side panel extends in the front-rear direction along the side sill at its lower end side, and a plurality of the welded seat surfaces are formed at intervals in the front-rear direction. structure.

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