JP6669089B2 - Side body structure of vehicle - Google Patents

Description

    The present invention relates to a side body structure of a vehicle.

  The side sill located below the center pillar of the vehicle has a side sill reinforcement as a reinforcing member therein (see FIG. 5 of Patent Document 1).

JP 2011-88596 A

  By the way, in recent years, there is a need to make the body frame of a base vehicle and a derivative vehicle derived from the base vehicle as common as possible, but the side sill reinforcement used in the base vehicle has been changed to another vehicle having a longer wheelbase than the base vehicle. It is conceivable to extend the side sill reinforcement by connecting an extension member to a base member constituting the side sill reinforcement. In this case, if the part of the base member and the part of the extension member are overlapped and the overlapped portion is welded, the extension member can be firmly fixed to the base member.

  If another vehicle or the like collides with the side of the vehicle (side collision), a large load is applied to the side sill reinforcement via the center pillar or the like. In this case, the overlapping portion where the base member and the extension member overlap has a larger plate thickness than the other portion, and there is a difference in strength between the overlapping portion and the other portion. Stress may concentrate on the

  On the other hand, for example, if the thickness of the portion other than the overlapped portion of the base member is increased, there is no difference in strength between the overlapped portion and the other portions, and the concentration of stress at the boundary portion between them is reduced. Can be prevented. However, in this case, since the thickness of the portion other than the overlapped portion of the base member is increased, a new problem arises in that the weight of the side sill reinforcement increases, and eventually the weight of the vehicle increases.

  The present invention has been made in view of such circumstances, and has as its object to provide a side body structure of a vehicle in which the extension member is connected to the base member while suppressing an increase in weight.

A side body structure of a vehicle according to one aspect of the present invention includes a side sill extending in a vehicle front-rear direction at a vehicle width direction end at a lower part of a vehicle body, and a center pillar extending upward from a middle portion of the side sill to the vehicle body, The side sill includes a base member fixed to a lower portion of the center pillar and extending in the front-rear direction, and an extension member connected to a front end portion or a rear end portion of the base member and extending in the front-rear direction. Has a U-shaped basic projection extending in the front-rear direction and projecting outward in the vehicle width direction, and the extension member extends in the front-rear direction and projecting outward in the vehicle width direction. And a connecting portion extending from the extended convex portion toward the center pillar and overlapped with the basic convex portion from the vehicle width direction inner side, wherein the connecting portion has an inner peripheral upper surface of the basic convex portion. Connecting upper plate fixed to And a connection lower plate fixed to the inner peripheral lower surface of the base protrusion, and a connection side plate fixed to the inner peripheral side surface of the base protrusion, the connection upper plate and the lower connection. The plate portion includes a reduced portion in which the size in the vehicle width direction becomes smaller as approaching the center pillar, and the longitudinal size of the outer end portion in the vehicle width direction is larger than the longitudinal size of the inner end portion in the vehicle width direction, In addition, an outer end portion in the vehicle width direction of the connection upper plate portion and the connection lower plate portion is connected to an upper end portion and a lower end portion of the connection side plate portion, respectively, and a boundary portion between the connection upper plate portion and the connection side plate portion. A ridgeline is formed at a boundary portion between the connection lower plate portion and the connection side plate portion, and the connection side plate portion has an edge on the center pillar side extending vertically in a side view, and a vertical center portion. To the center pillar side edge. Bead extending in the longitudinal direction so as to reach is formed.

In this configuration , both the upper connection plate portion and the lower connection plate portion include a reduced portion in which the dimension in the vehicle width direction decreases as approaching the center pillar. Thereby, at a portion corresponding to the reduced portion in the overlapped portion where the base member and the extension member overlap, the strength gradually decreases as approaching the center pillar. Therefore, a difference in strength hardly occurs at the boundary between the overlapped portion and the other portion, and the concentration of stress at the boundary can be prevented. Thus, it is not necessary to increase the thickness of the portion other than the overlapping portion in the base member.

In the above configuration, the ridge lines are formed at the boundary between the connection upper plate and the connection side plate and at the boundary between the connection lower plate and the connection side plate . That is, since the connecting portion has a ridge line at the outer end in the vehicle width direction receiving the load from the base member, the strength against the load received from the base member can be efficiently secured. Therefore, in order to secure the strength of the connecting portion, it is not necessary to unnecessarily lengthen the connecting portion in the front-rear direction or increase the plate thickness. As described above, according to the above configuration, it is not necessary to increase the thickness of the portion other than the overlapped portion of the base member, and it is not necessary to increase the longitudinal dimension or the thickness of the connecting portion. An increase in the weight of the structure can be suppressed.

Further, in the above-mentioned side body structure of the vehicle, the connection upper plate portion and the connection lower plate portion are both welded to a first welding point, which is a welding point with the base projection, and a welding to the base projection. A second welding point located closer to the center pillar than the first welding point, and a welding point between the base projection and the second welding point located closer to the center pillar than the second welding point. And three welding points, and the second welding point may be located on the inner side in the vehicle width direction with respect to an imaginary line connecting the first welding point and the third welding point.

  Here, in the case of a side collision, since a load is transmitted to the side sill via the center pillar, a large force is applied to the third welding point closest to the center pillar. In particular, when the first welding point, the second welding point, and the third welding point are arranged in a straight line, the force applied to the third welding point is much larger than that of the adjacent second welding point. , It is necessary to take measures such as increasing the number of welding points and increasing the joining strength, and the productivity is reduced. On the other hand, in the above configuration, the second welding point is located on the inner side in the vehicle width direction with respect to the imaginary line connecting the first welding point and the third welding point. And the load on the third welding point can be reduced accordingly. Therefore, according to the above configuration, the force applied to each welding point can be dispersed, and the strength of the side sill can be improved without lowering the productivity.

  As described above, according to the above configuration, it is possible to provide a side body structure of a vehicle in which an extension member is connected to a base member while suppressing an increase in weight.

FIG. 1 is a perspective view of a side sill reinforcement. FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is an enlarged view of the extension member. FIG. 4 is a plan view of the extension member. FIG. 5 is a bottom view of the extension member.

  Hereinafter, a side body structure of a vehicle according to an embodiment of the present invention will be described focusing on a side sill reinforcement. It is assumed that the concept of the direction in the following description matches the concept of the direction viewed from the driver in the driver's seat. The side sill reinforcements are provided on both left and right sides of the vehicle, and the left and right side sill reinforcements are formed symmetrically. Accordingly, the right side sill reinforcement will be described below, and the description of the left side sill reinforcement will be omitted.

  FIG. 1 is a perspective view of the side sill reinforcement 100. FIG. The direction toward the lower right of the paper of FIG. 1 is the front, the direction toward the upper left of the paper is the rear, the direction toward the front of the paper is the outside in the vehicle width direction, and the direction toward the back of the paper is the vehicle width direction. It is inward (similarly in FIG. 3). FIG. 2 is a cross-sectional view taken along line II-II in a cross section perpendicular to the front-rear direction along the dashed line in FIG. The right side of the paper of FIG. 2 is the outer side in the vehicle width direction, and the left side of the paper is the inner side in the vehicle width direction.

  As shown in FIG. 2, the side sill reinforcement 100 includes a side sill inner 101 (not shown in FIG. 1) that covers the side sill reinforcement 100 from the inside in the vehicle width direction and a side sill outer 102 (in FIG. 1) that covers the side sill reinforcement 100 from the outside in the vehicle width direction. Together with the side sill 103 (not shown). The side sill reinforcement 100 has a function as a reinforcing member of the side sill 103. The side sill 103 is a portion of the side body structure of the vehicle that extends in the vehicle front-rear direction at an end in the vehicle width direction below the vehicle body.

  As shown in FIG. 1, the side sill reinforcement 100 includes a base member 10 and an extension member 30 connected to a rear end portion of the base member 10. The base member 10 is a member used in a base vehicle (not shown). By connecting the extension member 30 to the base member 10, the base member 10 is connected to a vehicle having a longer wheelbase than the base vehicle (the vehicle according to the present embodiment). ) Can be used. In the present embodiment, the extension member 30 is connected to the rear end of the base member 10, but may be connected to the front end of the base member 10. It may be connected to both. Hereinafter, the base member 10 and the extension member 30 will be described in order.

<Basic members>
The base member 10 is fixed to a lower part of the center pillar reinforcement 104. The base member 10 extends in the front-rear direction, and a tip portion of the base member 10 is fixed to a lower portion of a front pillar reinforcement (not shown). The center pillar reinforcement 104 constitutes a part of the center pillar 105 and is a reinforcing member provided inside the center pillar 105. The front pillar reinforcement is a reinforcing member that forms a part of the front pillar and is provided inside the front pillar. The center pillar 105 is a portion of the side body structure of the vehicle that extends upward from the middle portion of the side sill 103.

  The base member 10 is formed by pressing a plate material and is formed by pressing a base material. The base upper flange portion 11 is located at an upper portion and extends in the front-rear direction. The base lower flange portion 12 is located at a lower portion and extends in the front-rear direction. A base projection 13 is provided between the upper flange 11 and the base lower flange 12 and extends in the front-rear direction. The upper base flange portion 11 and the lower base flange portion 12 are located on the same plane perpendicular to the vehicle width direction, and both are fixed to the side sill inner 101 (see FIG. 2).

  As shown in FIG. 2, the base projection 13 projects outward in the vehicle width direction, and has a U-shaped cross section in which the inside in the vehicle width direction is open. The base protruding portion 13 is located at the upper portion and extends substantially horizontally, the lower base portion 15 is located at the lower portion and extends substantially horizontally, and is located at the outer portion in the vehicle width direction. And a base side plate portion 16 extending vertically. As shown in FIG. 1, a notch 17 is formed at the rear end of the base plate 16, and an opening 18 is formed forward of the notch 17.

<Extension member>
The extension member 30 has a front portion fixed to the base member 10 and a rear portion fixed to a lower portion of the rear pillar reinforcement 106. The rear pillar reinforcement 106 constitutes a part of the rear pillar 107 and is a reinforcing member provided inside the rear pillar 107.

  The extension member 30 is formed by pressing a plate material, like the base member 10. The extension member 30 includes an extended upper flange portion 31 located in an upper portion and extending in the front-rear direction, an extended lower flange portion 32 located in the lower portion and extending in the front-rear direction, an extended upper flange portion 31 and an extended lower flange portion 32 And an extension protrusion 33 extending in the front-rear direction and located between them. The extended upper flange portion 31 and the extended lower flange portion 32 are located on the same plane perpendicular to the vehicle width direction, and both are fixed to the side sill inner 101 (see FIG. 2).

  The extension protrusion 33 has the same shape as the base protrusion 13. That is, the extension convex portion 33 protrudes outward in the vehicle width direction, and has a U-shaped cross section in which the inside in the vehicle width direction is open. The extension protrusion 33 is located at an upper portion and extends substantially horizontally, an extension lower plate 35 is located at a lower portion and extends substantially horizontally, and is located at an outer portion in the vehicle width direction. And an extended side plate portion 36 extending vertically.

  Here, FIG. 3 is an enlarged view of the extension member 30. FIG. 4 is a plan view of the extension member 30, and FIG. 5 is a bottom view of the extension member 30. 3 to 5, the base member 10 is omitted so that the front part of the extension member 30 appears. In FIG. 4, the upper side of the paper is the inside in the vehicle width direction, the lower side of the paper is the outside in the vehicle width direction, the right side of the paper is the front, and the left side of the paper is the rear. In addition, the upper side of the paper of FIG. 5 is the outer side in the vehicle width direction, the lower side of the paper is the inner side in the vehicle width direction, the right side of the paper is the front, and the left side of the paper is the rear.

  As shown in FIG. 3, the extension member 30 has a connecting portion 40. The connecting portion 40 is a portion fixed to the base member 10 and, as shown in FIG. 2, is located inside the base protrusion 13 in the vehicle width direction and overlaps the base protrusion 13 from the vehicle width direction inside. Are aligned.

  The connection portion 40 has a connection upper flange portion 41, a connection lower flange portion 42, a connection upper plate portion 44, a connection lower plate portion 45, and a connection side plate portion 46.

  The connection upper flange portion 41 is continuous from the extended upper flange portion 31 and extends from the extended upper flange portion 31 toward the center pillar 105 (center pillar reinforcement 104). The lower end portion of the connection upper flange portion 41 and the inner end portion of the connection upper plate portion 44 in the vehicle width direction are connected. The connection upper flange portion 41 is fixed to the inner side surface in the vehicle width direction of the base upper flange portion 11 by welding. In addition, the black circles in FIGS. 3 to 5 indicate welding points between the connecting portion 40 of the extension member 30 and the base member 10.

  The connection lower flange portion 42 is continuous from the extension lower flange portion 32 and extends from the extension lower flange portion 32 toward the center pillar 105. Further, an upper end portion of the connection lower flange portion 42 and an inner end portion of the connection lower plate portion 45 in the vehicle width direction are connected. The connection lower flange portion 42 is fixed to the inner side surface in the vehicle width direction of the base lower flange portion 12 by welding.

  The connection upper plate portion 44 is continuous from the extension upper plate portion 34 and extends from the extension upper plate portion 34 toward the center pillar 105. The outer end portion of the connection upper plate portion 44 in the vehicle width direction and the upper end portion of the connection side plate portion 46 are connected to each other, and a ridgeline is formed at a boundary between them. As shown in FIG. 4, the connecting upper plate portion 44 has a substantially triangular shape in plan view, and the longitudinal dimension L1 of the outer end portion in the vehicle width direction is the longitudinal dimension of the inner end portion in the vehicle width direction. It is formed to be larger than L2.

  Further, the connection upper plate portion 44 includes an upper plate reduction portion 47 whose size in the vehicle width direction decreases as the distance from the center pillar 105 approaches. The outer edge forming the reduced upper plate portion 47 includes a straight upper plate inclined side 48 that is inclined so as to approach the outer end portion in the vehicle width direction of the connecting upper plate portion 44 as approaching the center pillar 105. .

  The connection upper plate portion 44 is fixed to the lower surface of the base upper plate portion 14, that is, the inner peripheral upper surface of the base protrusion 13 by welding. Here, the connection upper plate portion 44 of the present embodiment has a first welding point 61, a second welding point 62, and a third welding point 63 as welding points with the inner peripheral upper surface of the base projection 13. .

  The first welding point 61 is located farthest from the center pillar 105 among the three welding points and near the outer end of the connecting upper plate portion 44 in the vehicle width direction. The second welding point 62 is located closer to the center pillar 105 than the first welding point 61 and near the upper plate inclined side 48. The third welding point 63 is located closer to the center pillar 105 than the second welding point 62 and near the upper plate inclined side 48 near the outer end portion of the connecting upper plate portion 44 in the vehicle width direction. As described above, in the present embodiment, the welding points are not arranged in a line, and the second welding point 62 is located on the inner side in the vehicle width direction with respect to the imaginary line 108 connecting the first welding point 61 and the third welding point 63. are doing.

  The lower connection plate portion 45 is configured similarly to the upper connection plate portion 44. That is, the connection lower plate portion 45 is continuous from the extension lower plate portion 35 and extends from the extension lower plate portion 35 toward the center pillar 105. The outer end portion in the vehicle width direction of the connecting lower plate portion 45 and the lower end portion of the connecting side plate portion 46 are connected, and a ridgeline is formed at a boundary portion between them. As shown in FIG. 5, the connecting lower plate portion 45 has a substantially triangular shape in plan view, and the longitudinal dimension L1 of the outer end portion in the vehicle width direction is the longitudinal dimension of the inner end portion in the vehicle width direction. It is formed to be larger than L2.

  Further, the connecting lower plate portion 45 includes a lower plate reducing portion 49 whose size in the vehicle width direction decreases as the distance from the center pillar 105 increases. The outer edge forming the lower plate reduced portion 49 includes a linear lower plate inclined side 50 that is inclined so as to approach the outer end portion in the vehicle width direction of the connecting lower plate portion 45 as approaching the center pillar 105. .

  The connecting lower plate portion 45 is fixed to the upper surface of the base lower plate portion 15, that is, the inner lower surface of the base protrusion 13 by welding. Further, similarly to the connection upper plate portion 44, the connection lower plate portion 45 includes a first welding point 61, a second welding point 62, and a third welding point 63 as welding points with the inner peripheral lower surface of the base projection 13. The second welding point 62 is located inside the imaginary line 108 connecting the first welding point 61 and the third welding point 63 in the vehicle width direction.

  As shown in FIG. 3, the connection side plate portion 46 is continuous from the extension side plate portion 36 and extends from the extension side plate portion 36 toward the center pillar 105. The connection side plate portion 46 is formed so as to connect an outer end portion of the connection upper plate portion 44 in the vehicle width direction and an outer end portion of the connection lower plate portion 45 in the vehicle width direction. The connection side plate portion 46 is formed in a rectangular shape in a side view, and a bead 51 extending in the front-rear direction is formed at a central portion in the vertical direction. The bead 51 has a groove-like shape depressed inward in the vehicle width direction, and can increase the strength of the connection side plate portion 46.

  The connection side plate portion 46 is fixed to the inner side surface of the base side plate portion 16 in the vehicle width direction, that is, the inner peripheral side surface of the base protrusion 13 by welding. The welding points for welding the connection side plate portion 46 and the inner peripheral side surface of the basic projection 13 are located on both sides of the upper portion and the lower portion of the bead 51 so as to sandwich the bead 51. The notch 17 and the opening 18 formed in the base side plate portion 16 of the base protrusion 13 are located at a portion of the base side plate portion 16 facing the bead 51.

<Effects>
As described above, in the vehicle side body structure according to the present embodiment, the connection upper plate portion 44 of the extension member 30 has the upper plate reduction portion 47, and the connection lower plate portion 45 has the lower plate reduction portion 49. ing. For this reason, the overlapped portion where the base member 10 and the extension member 30 overlap, as the strength decreases as approaching the center pillar 105, a large difference in strength does not occur at the boundary portion between the overlapped portion and the portion closer to the center pillar 105, In the event of a side collision, it is possible to prevent stress from being concentrated on the boundary. This eliminates the need to increase the thickness of the portion closer to the center pillar 105 than the overlapped portion of the base member 10 in order to eliminate the difference in strength, so that it is possible to suppress an increase in the weight of the side body structure of the vehicle.

  Further, in the present embodiment, a ridge line is formed at a boundary portion between the connection upper plate portion 44 and the connection side plate portion 46 and at a boundary portion between the connection lower plate portion 45 and the connection side plate portion 46. That is, the connecting portion 40 has a ridge line at an outer end portion in the vehicle width direction that receives a load from the base member 10. Therefore, the strength against the load received from the base member 10 is efficiently secured. As a result, in the present embodiment, since it is not necessary to unnecessarily lengthen the connecting portion 40 in the front-rear direction or increase the plate thickness, it is possible to suppress an increase in weight of the side body structure of the vehicle.

  Furthermore, in this embodiment, since the bead 51 is formed in the connection side plate portion 46, the strength of the connection portion 40 with respect to the load received from the base member 10 can be efficiently secured, and thus the side body structure of the vehicle can be secured. Weight increase can be further suppressed.

  In the present embodiment, the above-described first welding point 61, second welding point 62, and third welding point 63 are not aligned on a straight line. Therefore, in the event of a side collision, a force is more likely to be applied to the second welding point 62 than when the welding points are aligned, and the load on the third welding point 63 can be reduced. Therefore, there is no need to increase the number of welding points or increase the joining strength, and the productivity can be improved.

<Modifications>
The connecting portion 40 of the present embodiment extends from the extended upper flange portion 31, the extended lower flange portion 32, and the extended convex portion 33 toward the center pillar 105, but only from the extended convex portion 33 toward the center pillar 105. It may be configured to extend. That is, the connecting portion 40 may not have the connecting upper flange portion 41 and the connecting lower flange portion 42.

  Further, in the above description, both the connection upper plate portion 44 and the connection lower plate portion 45 include the reduced portions 47 and 49, and both outer end portions in the vehicle width direction are connected to the connection side plate portion 46, and these boundary portions are formed. The case where the ridge line is formed in the portion has been described. However, one of the connection upper plate portion 44 and the connection lower plate portion 45 includes the reduced portions 47 and 49, and the vehicle width direction outer end portion of one of the connection upper plate portion 44 and the connection lower plate portion 45. May be connected to the connection side plate portion 46, and a ridgeline may be formed at these boundary portions.

  In the above description, both the connection upper plate portion 44 and the connection lower plate portion 45 have the first welding point 61, the second welding point 62, and the third welding point 63 that are not aligned. Has been described, but only one of the connection upper plate portion 44 and the connection lower plate portion 45 may have welding points aligned in this manner.

Reference Signs List 10 base member 13 base protrusion 30 extension member 33 extension protrusion 40 connecting portion 44 connecting upper plate portion 45 connecting lower plate portion 46 connecting side plate portion 47 upper plate reducing portion 49 lower plate reducing portion 51 bead 61 first welding point 62 first 2 welding point 63 3rd welding point 100 Side sill reinforcement 104 Center pillar reinforcement 105 Center pillar 108 Virtual line

Claims (2)

A side sill extending in the vehicle front-rear direction at the vehicle width direction end at the lower part of the vehicle body,
A center pillar extending upward from the intermediate portion of the side sill to the vehicle body,
The side sill is
A base member fixed to a lower portion of the center pillar and extending in the front-rear direction;
An extension member connected to a front end portion or a rear end portion of the base member and extending in the front-rear direction,
The base member has a base convex portion having a U-shaped cross section that extends in the front-rear direction and protrudes outward in the vehicle width direction,
The extension member extends in the front-rear direction and extends in the vehicle width direction and projects outward in the vehicle width direction, and extends from the extension protrusion toward the center pillar, and extends from the vehicle width direction inner side to the base convex portion. And a connection portion superimposed,
The connection portion is a connection upper plate portion fixed to the inner peripheral upper surface of the basic convex portion, a connection lower plate portion fixed to the inner peripheral lower surface of the basic convex portion, and an inner peripheral side surface of the basic convex portion. A fixed side plate portion to be fixed,
Each of the connection upper plate portion and the connection lower plate portion includes a reduced portion in which a dimension in a vehicle width direction decreases as approaching the center pillar, and a longitudinal dimension of an outer end portion in a vehicle width direction has an inner end in a vehicle width direction. The upper end of the connecting upper plate and the outer end of the connecting lower plate in the vehicle width direction are connected to the upper end and the lower end of the connecting side plate, respectively. A ridgeline is formed at a boundary portion between the portion and the connection side plate portion and at a boundary portion between the connection lower plate portion and the connection side plate portion,
The connection side plate portion has an edge on the center pillar side extending vertically in a side view, and a bead extending in the front-rear direction is formed at a central portion in the vertical direction so as to reach the edge on the center pillar side. The side body structure of the vehicle. The connection upper plate portion and the connection lower plate portion are both a first welding point that is a welding point with the base convex portion,
A second welding point located at a position closer to the center pillar than the first welding point;
A third welding point located closer to the center pillar than the second welding point;
2. The side body structure of the vehicle according to claim 1 , wherein the second welding point is located inside the virtual line connecting the first welding point and the third welding point in the vehicle width direction. 3.

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