JP5053406B2 - Auto body structure - Google Patents

Description

  The present invention relates to a vehicle body structure of an automobile, and more particularly to a vehicle body floor structure.

  2. Description of the Related Art Conventionally, an automobile body structure has a pair of left and right side sills extending in the front-rear direction of the vehicle body and a cross member that supports a seat, and joins the end of the cross member in the longitudinal direction (vehicle width direction) and the side sill. In addition, there is a structure in which a reinforcing plate for connecting the side sill and the floor panel to each other is provided, and a part of each of the side sill, the end portion of the cross member, and the reinforcing plate is overlapped with each other (see, for example, Patent Document 1). By such reinforcement, it is possible to prevent a large stress from being generated at the joint portion between the side sill and the cross member with respect to the front collision.

JP 2000-25655 A

  However, in an automobile, there is also a collision (side collision) from the side, and in the case of the above-mentioned Patent Document 1, the end of the cross member including the reinforcing plate is a side sill inner (the inner side of the side sill). Since the members are coupled to each other in the side-opposing direction, there is a problem in that the member is deformed in the vicinity of the mating portion and the impact force cannot be suitably absorbed by the cross member. On the other hand, it is possible to cope by increasing the plate thickness of each reinforcing member, but there arises a problem that the cost increases and the weight increases.

  In order to solve such problems and efficiently absorb the impact force by the cross member without increasing the thickness of the reinforcing member with respect to the side collision, in the present invention, the floor panel (12) A pair of left and right side sills (14) coupled to both side edges in the vehicle body width direction and extending in the vehicle body front-rear direction, and the floor panel form a closed cross section and extend in the vehicle body width direction A cross member (36) fixed to the floor panel, and the side sill is formed to have a height higher than the floor panel than the cross member, and the cross member is opposite to the floor panel side. One end (1a) is coupled to the upper surface (36a) on the side and the other end (1b) is coupled to the upper surface (14a) on the side opposite to the floor panel side of the side sill. A reinforcing member (1) having an inverted U-shaped cross-sectional shape covering the upper part of the loss member is provided, and the reinforcing member is a concave portion formed in a dish shape in a portion that forms an inclined surface from the upper surface of the cross member to the upper surface of the side sill. (2) and a bead (3) provided from the top surface of the cross member to the top surface of the side sill across the concave portion at equal intervals.

  According to this, the portion that becomes the slope of the reinforcing member bridges between the upper surface of the cross member of different height and the upper surface of the side sill, and the portion that becomes the slope extends from the upper surface of the cross member to the upper surface of the side sill. Since the bead is provided so as to reach, the strength against the side impact load in the reinforcing member is increased, and the load applied to the cross member from the side sill by the side impact can be distributed and received by the reinforcing member.

  In particular, an outer edge (2a) corresponding to the edge (36b) of the upper surface of the cross member on the outer periphery of the recess of the reinforcing member is formed so as to reach a straight line to the ridge line (4) of the one end. Good to be. According to this, the lower side wall (2b) of the outer edge portion is bent along the fold line (X) at a small inclination angle with respect to the side wall (2c) at one end portion, and stress concentration due to press molding can be prevented. , Can prevent the occurrence of cracks.

  Further, the bead (3) is preferably provided in a straight line over the upper surface (36a) of the cross member and the upper surface (14a) of the side sill. Strength is increased and the side impact load on the cross member can be efficiently distributed.

  The bead (3) is preferably formed to have an inverted U-shaped cross section that opens toward the upper surface (36a) of the cross member. According to this, the cross-sectional shape of the bead is strong. The shape is high, and the side impact load on the cross member can be efficiently distributed. In particular, it is preferable that the cross-sectional shape of the bead is maximized at the center of the portion crossing the concave portion. According to such a cross-sectional shape of the bead, the central portion of the concave portion with respect to the bead extending from the upper surface of the cross member to the upper surface of the side sill. Since the part comes closer to the upper surface of the cross member and the outer edge of the recess can extend linearly from the edge of the upper surface of the cross member, the side impact load is efficiently transmitted from the side sill to the cross member. Can do.

  The side sill (14) includes a side sill inner (14a) on the cross member side, a side sill outer (14b) on the outside of the vehicle body, and a side sill stiffener (14c) provided between the side sill inner and the side sill outer. The upper wall (14d) of the side sill inner and the upper wall (14e) of the side sill stiffener are preferably located at the same height. According to this, since both the side sill stiffener and the side sill inner are thick plates, the side impact load is transmitted to the reinforcing member linearly via the upper wall of the side sill stiffener and the upper wall of the side sill inner. Since it is transmitted to the cross member through the bead of the member, deformation of the surface of the side sill inner facing the cross member can be prevented, and the side impact load can be efficiently distributed to the reinforcing member.

  Thus, according to the present invention, the upper surface of the cross member of different height and the upper surface of the side sill are connected via the reinforcing member, and the bead is attached to the sloped portion from the upper surface of the cross member to the upper surface of the side sill. By providing, the strength against the side impact load in the reinforcing member is increased, and the load applied to the cross member from the side sill by the side impact can be distributed and received by the reinforcing member, and the strength member becomes a high strength reinforcing member. Since it is not necessary to increase the plate thickness, the cost can be reduced.

It is a principal part top view of the floor panel of the motor vehicle to which this invention was applied. It is the principal part perspective view seen from the arrow II line of FIG. It is the principal part broken view seen along the arrow III-III line | wire of FIG. It is a principal part fracture | rupture perspective view corresponding to FIG. It is principal part sectional drawing fractured | ruptured by the arrow VV line | wire of FIG. It is a perspective view which shows the reinforcement member based on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, each member demonstrated below is formed by pressing a steel plate etc., The coupling | bonding of each member and joining may be performed by spot welding.

  FIG. 1 is a plan view of a main part of a vehicle floor panel 12 to which the present invention is applied as viewed from above. In FIG. 1, a dashboard panel 10 that separates an engine room and a vehicle compartment is provided at the front of the vehicle body. A floor panel 12 having a front end connected to the lower end of the dashboard panel 10 is horizontally disposed on the vehicle compartment side of the dashboard panel 10. The floor panel 12 is present behind the vehicle body from the rear end of the front side frame 20.

  On both left and right sides of the floor panel 12, left and right box-shaped side sills 14 extending in the longitudinal direction of the vehicle body are horizontally disposed. As shown in FIG. 4, the side sill 14 is formed by connecting a side sill inner 14a and a side sill outer 14b, each having a substantially U-shaped cross section, facing each other so as to have a rectangular closed cross-sectional shape. Between the inner 14a and the side sill outer 14b, a side sill stiffener 14c having a shape along the inner surface of the side sill outer 14b is provided. The side sill inner 14a, the side sill outer 14b, and the side sill stiffener 14c each have an edge extending in the vertical direction, and each edge is overlapped and joined in accordance with each of the above arrangements to be integrated. . Further, the side sill inner 14a and the side sill stiffener 14c are formed of a thicker plate than the side sill outer 14b to form a single skeleton.

  The left and right side sills 14 are respectively coupled to the left and right side edges of the floor panel 12. The rear ends of the left and right side sills 14 are connected to the front ends of left and right box-shaped side sill extension members 16 extending in the vehicle longitudinal direction in a straight line with the left and right side sills 14 in plan view. In the center of the floor panel 12 in the vehicle width direction, a center tunnel portion 26 having a mountain-shaped cross section protruding toward the vehicle interior side and extending in the vehicle body front-rear direction is formed by press molding.

  A pair of left and right cross members 36 extending in the vehicle width direction across the center tunnel portion 26 are provided at the vehicle body longitudinal direction intermediate portion in FIG. 1 of the floor panel 12. The cross member 36 is coupled to the upper surface (vehicle inner surface) of the floor panel 12 and has a rectangular cross-sectional shape that forms a closed cross-section with the floor panel 12, and one end in the longitudinal direction (extending direction) is coupled to the side sill 14. The other end is coupled to the center tunnel portion 26.

  As shown in FIGS. 2 and 3, the height of the side sill 14 from the floor panel 12 is higher than the height of the cross member 36 from the floor panel 12, and the floor panel 12 side of the cross member 36 and the side sill 14. Has a step between the upper surfaces 36a and 14g on the opposite sides. One end 1a of the reinforcing member 1 having an inverted U-shaped cross section is coupled to the upper surface 36a of the cross member 36, and the other end 1b of the reinforcing member 1 is coupled to the upper surface 14g of the side sill 14.

  Next, the reinforcing member 1 will be described with reference to FIGS. Between the both ends 1a and 1b of the reinforcing member 1, there is a portion that becomes a slope according to the height difference between the upper surface 36a of the cross member 36 and the upper surface 14g of the side sill 14, and the portion that becomes the slope is the upper surface 36a. A concave portion 2 formed in a dish shape with respect to a linear virtual slope extending from the upper surface 14g to the upper surface 14g, and a bead 3 formed so as to cross the central portion of the concave portion 2 from the upper surface 36a to the upper surface 14g. Consists of. The bead 3 can be formed by pressing the reinforcing member 1 and has an inverted U-shaped cross section that protrudes upward with respect to the recess 2. Further, the height in the protruding direction from the bottom portion of the concave portion 2 of the bead 3 is set to be highest near the intermediate point in the extending direction of the bead 3 (H in FIG. 3).

  According to the coupling structure of the side sill 14 and the cross member 36 configured as described above, as shown in FIGS. 3 and 4, the load applied to the side sill 14 due to a side collision (collision from the side) with respect to the vehicle body. In the upper part of the side sill 14, F can pass through the side sill stiffener 14c and the upper walls 14d and 14e of the side sill inner 14a as indicated by arrows in the figure. The upper walls 14d and 14e are provided so as to be positioned at the same height in the vertical direction of the vehicle body, so that the upper walls 14d and 14e can be disposed so as to face each other. Can be prevented from bending at the top of the side sill 14.

  As described above, the load F passing through the upper walls 14d and 14e is transmitted to the reinforcing member 1 as indicated by the arrows in FIG. In the reinforcing member 1, the bead 3 extends in the transmission direction of the load F, and the load F is transmitted to the cross member 36 through the bead 3. The bead 3 is formed in an inverted U-shaped cross-sectional shape as described above, and extends on the upper wall 14e of the side sill inner 14a. Therefore, the bead 3 has a strength against an axial load that is the extending direction (longitudinal direction). Since it is high, the effect of preventing the bending deformation at the joint portion between the side sill 14 and the cross member 36 is increased.

  The outer edge 2a corresponding to the edge of the upper surface 36a of the cross member 36 (the portion bent from the upper surface 36a toward the floor panel 12: ridge line) 36b on the outer periphery of the recess 2 is the edge 36b of the upper surface 36a of the cross member 36. It is formed so that it may become a ridge line extending linearly from the upper surface 14g of the side sill 14 to a lower part. The left and right outer edges 2a of the reinforcing member 1 and the beads 3 extend so as to be substantially parallel to each other, and extend from the upper surface 36a of the cross member 36 to the side sill 14 in a tripod shape. Can be received by the entire reinforcing member 1, and stress can be distributed to the cross member 36, so that the stress at the side collision can be efficiently received by the cross member 36. Further, it is possible to prevent the surface of the side sill inner 14a facing the cross member 36 from being deformed.

  Further, as described above, the outer edge 2a reaches a portion lower than the upper surface 14g of the side sill 14, and the inclination of the outer edge 2a with respect to the upper surface of the cross member 36 can be reduced, and the bead 3 crosses the center. Since the dish-shaped recess 2 is provided, the outer edge 2a can be formed in a straight line continuous from the edge 36b of the upper surface 36a of the cross member 36, the bending angle of the bent portion is reduced, and the press Formability can be improved and cracks can be prevented.

  Furthermore, as described above, by making the height in the protruding direction from the bottom surface of the concave portion 2 of the bead 3 the highest in the vicinity of the intermediate point in the extending direction of the bead 3, the cross-sectional shape of the bead 3 is increased. The size becomes the maximum near the intermediate point in the extending direction of the bead 3. By forming the bead 3 as such, the straightening of the outer edge 2a can be facilitated.

  As shown in FIG. 6, one end 1 a of the reinforcing member 1 is formed to cover the upper surface 36 a of the cross member 36 and the upper portions of both side surfaces, and the ridge line 4 of the portion corresponding to the edge 36 b is the reinforcing member 1. The outer edge 2a is formed so as to extend from the ridgeline 4 thereof. The ridgeline formed by the ridgeline 4 and the outer edge 2a is substantially linear, and the bending along the foldline X caused by the press molding of the side wall 2b below the outer edge 2a and the side wall 2c of the one end 1a is relatively relative. The cross member of the side wall 2b is formed so as to be bent at a small inclination angle, can prevent stress concentration due to press molding, and the stress during press molding of the reinforcing member 1 is located below the outer edge 2a of the reinforcing member 1 Therefore, it is possible to prevent the portion from concentrating on the joint portion to 36 and to prevent the portion from being cracked by the press load.

  In this manner, the load transmission efficiency from the side sill 14 to the cross member 36 can be increased, and the high strength of the reinforcing member 1 can be ensured without increasing the plate thickness. Cost reduction can be promoted.

  As shown in FIGS. 2 to 4, on the side sill 14 side of the reinforcing member 1, the corresponding end portion of the bead 3 is coupled to a ridge line 14 f that is on the cross member 36 side of the upper wall 14 e of the side sill inner 14 a. . The ridge line 14f corresponds to a bent portion formed by bending the side sill inner 14a, and has a high strength because it is a corner portion in a shape obtained by bending a plate material. Thereby, the load F can be efficiently transmitted from the upper wall 14e to the bead 3.

  In addition, as FIG. 4 shows, the partition member 5 is arrange | positioned in the space between the side sill stiffener 14c and the side sill inner 14b at appropriate intervals in the extending direction of the side sill 14. The partition member 5 is provided orthogonal to the inner surfaces of the side sill stiffener 14c and the side sill inner 14b, and is coupled to both inner surfaces. Thereby, the bending deformation of the side sill 14 with respect to a side collision can be suppressed small. By disposing the partition member 5 so as to correspond to the coupling position of the reinforcing member 1, the strength of the portion serving as a path through which the load F in the side sill 14 is transmitted to the reinforcing member 1 is increased, and the side impact load is further increased. The cross member 36 can be efficiently transmitted.

DESCRIPTION OF SYMBOLS 1 Reinforcement member 1a One end part 2 Recessed part 2a Outer edge part 3 Bead 4 Edge line 12 Floor panel 14 Side sill 14a Side sill inner 14b Side sill outer 14c Side sill stiffener 14d Upper wall 14e Upper wall 14g Upper surface 36 Cross member 36a Upper surface 36b Edge

Claims (6)

A pair of left and right side sills connected to both side edges of the floor panel in the vehicle body width direction and extending in the vehicle body front-rear direction, and forming a closed cross section with the floor panel and extending in the vehicle body width direction And a cross member fixed to the floor panel,
The side sill is formed with a height higher than the floor panel than the cross member,
One end is coupled to the upper surface of the cross member opposite to the floor panel side, and the other end is coupled to the upper surface of the side sill opposite to the floor panel side. A reinforcing member having an inverted U-shaped cross-sectional shape is provided,
The reinforcing member includes a concave portion formed in a dish shape in a portion that forms an inclined surface extending from the upper surface of the cross member to the upper surface of the side sill, and reaches the upper surface of the side sill from the upper surface of the cross member across the concave portion in equal divisions. A vehicle body structure comprising a bead provided as described above.   The outer edge corresponding to the edge of the upper surface of the cross member on the outer periphery of the concave portion of the reinforcing member is formed so as to reach a ridge line of the one end portion in a straight line. Car body structure.   3. The vehicle body structure according to claim 1, wherein the bead is provided linearly across an upper surface of the cross member and an upper surface of the side sill.   4. The vehicle body structure according to claim 1, wherein the bead is formed to have an inverted U-shaped cross section that opens toward an upper surface of the cross member. 5.   The vehicle body structure according to claim 4, wherein a cross-sectional shape of the bead is maximized at a center of a portion crossing the recess. The side sill includes a side sill inner on the cross member side, a side sill outer on a vehicle body outer side, and a side sill stiffener provided between the side sill inner and the side sill outer.
6. The vehicle body structure according to claim 1, wherein an upper wall of the side sill inner and an upper wall of the side sill stiffener are located at the same height.

Images