JP5012439B2 - Body side structure - Google Patents

Description

  The present invention relates to a vehicle body side structure, and more particularly to a vehicle body side structure in which a rocker (side sill) having a hollow closed cross section is disposed on a lower side of a vehicle body.

  In general, a rocker (side sill) having a hollow closed cross section extending in the front-rear direction is disposed on the lower side of the vehicle body, and both sides of the floor panel and lower parts such as a center pillar are coupled to the rocker. Here, the rocker is normally formed in a hollow closed cross section by a combined structure of a rocker inner and a rocker outer extending in the front-rear direction of the vehicle body.

As a vehicle body side structure provided with this type of rocker, for example, Patent Document 1 describes a structure in which a reinforcement is provided in the rocker in order to increase the axial buckling rigidity of the rocker against an offset collision of the vehicle. Has been. The reinforcement is formed in a folded plate shape having a uniform cross section (L-shaped cross section), and one piece thereof is welded to the inner surface of the intermediate portion in the vertical direction avoiding the flange connecting portion of the rocker inner front.
JP 2001-55171 A (paragraph 0009, FIG. 3)

  By the way, in the vehicle body side structure as described in Patent Document 1, it may be possible to increase the rocker's axial buckling rigidity, but if the rocker's bending rigidity in the vertical and horizontal directions is sufficiently high, I can't say that. For this reason, when a side collision load is input from another vehicle, the cross-sectional shape of the rocker may collapse and the rocker may be bent greatly.

  Accordingly, an object of the present invention is to provide a vehicle body side portion structure that can sufficiently increase the bending rigidity of a rocker (side sill) disposed on the lower side portion of the vehicle body.

The vehicle body side structure according to the present invention is a vehicle body side structure in which a rocker with a hollow closed cross section having a rocker inner and a rocker outer extending in the front-rear direction of the vehicle body is disposed on the lower side of the vehicle body. in the vicinity of top corners, cage extending the Activity is reinforcement in the longitudinal direction of the vehicle body, reinforcement has a cross section which recesses and projections in the width direction are continuous alternately, two protrusions rocker inner It is joined to the inner surface of the upper wall part, and the other two convex parts are joined to the inner surface of the upper part of the side wall of the rocker inner. Between the vicinity of the upper corner of the rocker inner and the reinforcement, there are three closed sections. A portion is formed.

  In the vehicle body side part structure according to the present invention, the rocker axial buckling rigidity is provided by a plurality of (preferably three or more) closed cross sections formed between the vicinity of the upper corner of the rocker inner and the reinforcement. In particular, the bending rigidity in the vertical and horizontal directions of the rocker is sufficiently increased. As a result, collapse of the cross-sectional shape of the rocker when a side collision load is input from another vehicle is suppressed, and bending of the rocker is suppressed.

  According to the vehicle body side part structure according to the present invention, the rocker is axially buckled by a plurality of (preferably three or more) closed cross sections formed between the vicinity of the upper corner of the rocker inner and the reinforcement. The rigidity can be increased, and in particular, the bending rigidity in the vertical and horizontal directions of the rocker can be sufficiently increased. As a result, the rocker can be prevented from being bent by suppressing the collapse of the cross-sectional shape of the rocker when a side collision load is input from another vehicle.

  Embodiments of a vehicle body side part structure according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a perspective view showing an appearance of a vehicle body side structure according to an embodiment, FIG. 2 is a partial perspective view of the rocker shown in FIG. 1, and FIG. 3 is an enlarged vertical section of the rocker shown in FIG. FIG.

  As shown in FIG. 1, a vehicle body side structure according to an embodiment includes a rocker (side sill) 1 that is disposed on the lower side of the vehicle body and extends in the vehicle longitudinal direction. The lower end of the front pillar 2 is coupled, and the lower end of the rear pillar 3 is coupled to the rear end. And the lower end part of the center pillar 4 is couple | bonded with the center part of the front-back direction of this rocker 1. FIG.

  As shown in FIG. 2, in the rocker 1, a rocker inner 1A and a rocker outer 1B, which are respectively formed in a substantially hat-shaped cross section, are welded face to face to form a hollow closed cross section between them. As the welding joint, an upper joint piece 1C and a lower joint piece 1D are formed on the rocker inner 1A, and an upper joint piece 1E and a lower joint piece 1F are formed on the rocker outer 1B.

  Here, a reinforcement 5 extending in the front-rear direction of the vehicle body is joined to the vicinity of the upper corner of the inner surface of the rocker inner 1 </ b> A constituting the rocker 1. As shown in the enlarged longitudinal sectional view of FIG. 3, the reinforcement 5 has a cross-sectional shape in which, for example, irregularities formed in a trapezoidal cross-section are alternately continued in the width direction, for example, four convex portions 5A. -5D and three recesses 5E-5G, and folding pieces 5H, 5I on both sides in the width direction.

  In the reinforcement 5 having such a cross-sectional shape, the four convex portions 5A to 5D are joined in the vicinity of the upper corner of the inner surface of the rocker inner 1A. That is, the two convex portions 5A and 5B are firmly joined to the inner surface of the upper wall portion 1G of the rocker inner 1A by laser welding or adhesion substantially continuously in the longitudinal direction, and the other two convex portions 5C and 5D are connected to the rocker inner 1A. The inner surface of the upper side wall 1H is firmly joined substantially continuously in the longitudinal direction by laser welding or adhesion.

  As a result, three closed sections (multi-cells) are formed between the reinforcement 5 and the vicinity of the upper corner from the upper wall portion 1G of the rocker inner 1A to the upper portion 1H of the side wall by the three recesses 5E to 5G. ) 6A to 6C are formed.

  Here, the length of the short side of the closed cross-sections 6A to 6C corresponding to the depth of the recesses 5E to 5G is set to, for example, about 4 to 8 times the plate thickness of the reinforcement 5, and the recesses 5E to 5G The lengths of the long sides of the closed cross-section portions 6 </ b> A to 6 </ b> C corresponding to the width are set to about 8 to 12 times the plate thickness of the reinforcement 5, for example.

  In the vehicle body side structure of one embodiment configured as described above, the reinforcement 5 is firmly joined to the inner surface near the upper corner from the upper wall 1G of the rocker inner 1A constituting the rocker 1 to the upper side 1H of the side wall. Since the three recesses 5E to 5G are arranged at intervals in the width direction in the reinforcement 5, the vicinity of the upper corner from the upper wall portion 1G of the rocker inner 1A to the upper portion 1H of the side wall is It functions as a plate thickness member having three closed cross sections 6A to 6C.

  Thus, since the upper corner portion extending from the upper wall portion 1G of the rocker inner 1A to the upper portion 1H of the side wall functions as a plate thickness member having three closed sectional portions 6A to 6C, the buckling rigidity of the rocker 1 in the axial direction is increased. In particular, the bending rigidity in the vertical and horizontal directions of the rocker 1 is sufficiently increased. In addition, the torsional rigidity of the rocker 1 can be increased. As a result, collapse of the cross-sectional shape of the rocker 1 when a side collision load is input from another vehicle is suppressed, bending of the rocker 1 is suppressed, and twisting of the rocker 1 is also suppressed.

  Here, the graph of FIG. 4A shows the rocker 1 in the present embodiment having the sectional shape shown in FIG. 3, the rocker 1 of the comparative example 1 having the sectional shape shown in FIG. FIG. 4B shows a simulation result of the bending characteristics in the vertical direction in comparison with the rocker 1 of the comparative example 2 having a cross-sectional shape shown in FIG. 4B, and the graph of FIG. The simulation results are shown in comparison.

  The rocker 1 of Comparative Example 1 shown in FIG. 5 (a) has a single closed cross section (single single section) by joining an L-shaped cross section of the reinforcement A to the inner surface near the upper corner of the rocker inner 1A. Cell) A1 is formed. On the other hand, the rocker 1 of the comparative example 2 shown in FIG. 5B has a closed cross-section portion by joining the reinforcement B having an L-shaped cross section along the inner surface near the upper corner of the rocker inner 1A. Not formed.

  Here, in the graph of FIG. 4A, the bold line graph shows the bending characteristics in the vertical direction of the rocker 1 in the present embodiment shown in FIG. 3, and the thin line graph is shown in FIG. The vertical bending characteristic of the rocker 1 of Comparative Example 1 is shown, and the broken line graph shows the vertical bending characteristic of the rocker 1 of Comparative Example 2 shown in FIG.

  As shown in the graph of FIG. 4A, compared to the thin line graph and the broken line graph, the bending moment indicated by the thick line graph is higher in a range where the rotation angle exceeds, for example, around 0.01. From this, it is understood that the bending rigidity in the vertical direction of the rocker 1 in the present embodiment is sufficiently higher than the rockers 1 of Comparative Examples 1 and 2.

  On the other hand, in the graph of FIG. 4B, the thick line graph shows the torsional characteristics of the rocker 1 in the present embodiment shown in FIG. 3, and the thin line graph shows the comparative example 1 shown in FIG. The torsional characteristics of the rocker 1 are shown, and the broken line graph shows the torsional characteristics of the rocker 1 of the comparative example 2 shown in FIG.

  As shown in the graph of FIG. 4B, compared to the thin line graph and the broken line graph, the moment indicated by the thick line graph is higher in a range where the rotation angle exceeds, for example, around 0.05. From this, it can be seen that the torsional rigidity of the rocker 1 in this embodiment is higher than that of the rockers 1 of Comparative Examples 1 and 2.

  That is, according to the vehicle body side portion structure of the present embodiment, the rocker 1 is formed by, for example, three closed cross sections (multi-cells) 6A to 6C formed between the upper corner portion of the rocker inner 1A and the reinforcement 5. Of course, the buckling rigidity in the axial direction can be increased, and in particular, the bending rigidity in the vertical and horizontal directions of the rocker 1 can be sufficiently increased, and the torsional rigidity can also be increased. As a result, the rocker 1 can be prevented from being bent and twisted by suppressing the collapse of the cross-sectional shape of the rocker 1 when a side collision load is input from another vehicle.

  The vehicle body side part structure according to the present invention is not limited to one embodiment. For example, the cross-sectional shape of the reinforcement 5 shown in FIG. 3 may be a cross-sectional shape in which irregularities of a rectangular cross-section are alternately continued in the width direction as shown in FIG. As shown in (b), the corrugated cross-section may have a cross-sectional shape in which the irregularities are alternately continued in the width direction. Further, the number of concave and convex concave portions that are alternately continued in the width direction is not limited to three, and may be an appropriate number such as four, five, and six.

It is a perspective view showing the appearance of the body side part structure concerning one embodiment of the present invention. It is a fragmentary perspective view of the rocker shown in FIG. FIG. 3 is an enlarged vertical sectional view of the rocker shown in FIG. 2. FIG. 4 is a graph showing vertical bending characteristics and torsional characteristics of the rocker having the cross-sectional shape shown in FIG. 3, wherein (a) is a graph showing vertical bending characteristics, and (b) is a graph showing torsional characteristics. It is a longitudinal cross-sectional view which shows the rocker of the comparative example which changed the cross-sectional shape of the reinforcement in the rocker shown in FIG. 3, Comprising: (a) is a longitudinal cross-sectional view of the rocker of the comparative example 1, (b) is a comparative example. It is a longitudinal cross-sectional view of 2 rockers. It is a longitudinal cross-sectional view which shows the rocker of the modification which changed the cross-sectional shape of the reinforcement in the rocker shown in FIG. 3, Comprising: (a) is a longitudinal cross-sectional view of the rocker of a 1st modification, (b) is the 1st. It is a longitudinal cross-sectional view of the rocker of 2 modifications.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rocker, 1A ... Rocker inner 1B ... Rocker outer, 1C ... Upper joining piece, 1D ... Lower joining piece, 1E ... Upper joining piece, 1F ... Lower joining piece, 1G ... Upper wall part, 1H ... Side wall upper part, 2 ... Front Pillars, 3 ... rear pillars, 4 ... center pillars, 5 ... reinforcements, 5A to 5D ... projections, 5E to 5G ... concaves, 6A to 6C ... closed sections.

Claims (2)

A vehicle body side structure in which a rocker with a hollow closed section having a rocker inner and a rocker outer extending in the front-rear direction of the vehicle body is disposed on the lower side of the vehicle body,
The upper corner near the portion of the inner surface of the rocker inner, reinforcement in the longitudinal direction of the vehicle body cage extending the Activity,
The reinforcement has a cross-sectional shape in which concave portions and convex portions are alternately continued in the width direction, the two convex portions are joined to the inner surface of the upper wall portion of the rocker inner, and the other two convex portions are It is joined to the inner surface of the upper part of the side wall of the rocker inner,
A vehicle body side structure, wherein three closed cross sections are formed between an upper corner portion of the rocker inner and the reinforcement. The three closed cross sections are formed on an inner surface of the upper wall portion of the rocker inner, an inner surface of the upper portion of the side wall, and an inner surface between the upper wall portion and the upper portion of the side wall. Item 2. The vehicle body side structure according to Item 1.

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