JP4853243B2 - Lower body structure - Google Patents

Description

  The present invention relates to a structure for reinforcing a rocker having a closed cross-sectional structure that constitutes a lower edge of a side surface of a vehicle body, and more particularly to a vehicle body lower structure that is reinforced by providing a bulkhead that partitions the rocker in the front-rear direction.

  Conventionally, a rocker having a closed cross-section structure that forms the lower edge of the side surface of a vehicle body is provided with a bulkhead made of a metal plate that partitions the closed cross section in the front-rear direction (for example, patents). Reference 1). In Patent Document 1, it is described that a rocker is strengthened against a collision load that acts on a rocker (side sill) from a front side member at the time of a vehicle offset collision. Also, the bulkhead installed in the locker serves to prevent the cross-section of the locker from collapsing in the event of a vehicle side collision.

  FIG. 4 is a schematic perspective view of a rocker provided with a bulkhead that prevents the rocker from collapsing in the case of a side collision of the vehicle, and FIGS. 5 and 6 show typical examples of this type of bulkhead. The locker 1 is provided along the side edge of the passenger compartment floor F, and forms a closed cross section with the outer panel 10, the reinforcement 2 along the inner surface side of the outer panel 10, and the inner panel 11. An intermediate pillar P is erected on the rocker 1 at the front and rear intermediate positions on the upper surface thereof. A plurality of bulkheads 6 are provided inside the locker 1 on the front door opening 8 side and the rear door opening 9 side defined by the intermediate pillar P, respectively. The bulkhead 6 is provided at a position corresponding to the vehicle width direction side terminal of the floor cross member 7 of the passenger compartment floor F.

The bulkheads 6 are provided in parallel in pairs at the front and rear positions and are integrally formed by connecting the side edges on the vehicle inner side of the bulkheads 6 with plate-like connecting portions 62. Each bulkhead 6 is a substantially rectangular metal plate, and is provided in a closed cross section formed by the reinforcement 2 and the inner panel 11, and has an upper edge flange, an outer side edge flange and a lower side of the outer circumference of the bulkhead 6. An edge flange is welded and fixed to the inner surface of the reinforcement 2, and the side edge on the inner side of the bulkhead 6 is placed in close proximity to the inner panel 11 so as to partition the closed cross section in the front and rear direction.

The bulkhead 6 is made lighter by reducing the plate thickness to the minimum necessary so as to suppress an increase in weight, and by providing a hole 63 or the like on the plate surface. On the other hand, a plurality of reinforcing beads 61 having a convex cross section extending in the vehicle width direction are provided in parallel on the plate surface of the bulkhead 6 in order to prepare for a collision load of a side collision even if the plate thickness is thin. The surface rigidity of the head 6 is reinforced.
JP-A-10-59218

  By the way, the conventional bulkhead 6 in which the reinforcing beads 61 are provided horizontally has the following problems. In an SUV or the like with a relatively low-diameter tire and a minimum ground clearance, the rocker 1 is also in a high position. As shown in FIG. 6, the bumper of the opponent vehicle T directly collides with the rocker 1 at the time of a side collision. , Against a collision load (white arrow G) acting horizontally on the inside of the vehicle, the bulkhead 6 provided with a reinforcing bead 61 parallel to the support acts as a support to prevent the rocker 1 from collapsing in cross section. Can be distributed to the floor cross member 7 and the passenger compartment floor F side. However, in a normal passenger car with a low minimum ground clearance, the position of the locker 1 is also low, and as shown in FIG. 7, the opponent vehicle T collides with the door D and the intermediate pillar P at a position higher than the locker 1 at the time of a side collision. As a result, when the lower portion of the intermediate pillar P is moved and deformed toward the inside of the vehicle, the rocker 1 coupled to the intermediate pillar P is pulled up toward the inside of the vehicle. The bulkhead 6 provided with the horizontal reinforcing beads 62 cannot sufficiently receive the collision load H against the collision load (white arrow H) acting on the rocker 1 and obliquely upward. The bulkhead 6 may be crushed and deformed by the load H, and the rocker 1 may collapse. If the cross section of the rocker 1 is broken, the rigidity of the entire rocker 1 is lowered and the vehicle body is greatly damaged during a side collision.

  In view of this, the present invention provides a bulkhead having a high strength against a collision load on the inside and obliquely upward acting on the rocker at the time of a side collision of the vehicle in an ordinary passenger vehicle or the like having a low minimum ground clearance, thereby breaking the cross section of the rocker. An object of the present invention is to provide a vehicle body lower structure that prevents and enhances the rigidity of a rocker.

The present invention provides a vehicle body lower structure in which a bulkhead made of a metal plate is installed inside a rocker having a closed cross section constituting a lower edge of a side surface of a vehicle body so as to partition the closed cross section in the longitudinal direction of the rocker. Is formed by an outer panel on the outer side of the vehicle, a reinforcement installed along the inside of the outer panel, and an inner panel on the inner side of the vehicle, and the bulk in the closed cross section formed by the reinforcement and the inner panel. A head is installed , along the diagonal line connecting the bottom edge corner of the vehicle outside the closed cross section formed by the reinforcement and the inner panel and the top edge corner of the inside of the vehicle on the bulkhead plate surface. A reinforcing bead extending linearly in the inclination direction is provided .

Inclination direction along the diagonal line connecting the reinforcement bead on the bulkhead plate surface between the lower edge corner of the vehicle outside the closed section and the upper edge corner of the vehicle inside of the reinforcement and inner panel Since it is formed in a straight line shape, the surface rigidity of the bulkhead can be strengthened against the obliquely upward collision load acting on the rocker during a side collision of the vehicle, and the collapse of the closed cross section of the rocker due to the collision load is prevented.

The above bulkhead at its lower edge, to form a reinforcing flange extending substantially parallel to a straight line between the reinforcing bead (claim 2). The reinforcement flanges along with the reinforcement beads enhance the bulkhead's rigidity against impact loads.

A pair of bulkheads facing the front and rear are provided at the front and rear positions in the rocker, respectively, and both bulkheads are connected by a connecting portion between the side edges or the upper edges of the inside of the vehicle to form an integrated structure (claim) Item 3 ). A pair of front and rear bulkheads can effectively prevent collapse of the closed cross section of the rocker.

The bulkhead is provided on the side end portion opposite to the position of the floor cross member extending in the vehicle width direction along the vehicle compartment floor (claim 4). The collision load can be efficiently transmitted from the locker side to the passenger compartment floor side.

  An embodiment in which the present invention is applied to a locker such as an ordinary passenger car shown in FIG. 4 will be described. As shown in FIGS. 1, 2, and 4, the rocker 1 extending in the front-rear direction along the side edge of the passenger compartment floor F includes an outer panel 10 having a substantially hat-shaped cross section that opens from the vehicle exterior toward the vehicle interior, Reinforcement 2 having a substantially hat-shaped cross section along the inner surface of the outer panel 10 and an inner panel 11 having a shallow cross-sectional shape that opens toward the outside of the vehicle, on the contrary, each of these panels 10, The upper and lower edge flanges 2 and 11 and the lower edge flanges are integrally joined together to form a closed cross-sectional structure.

  The locker 1 forms the lower edge of the front door opening 8 and the rear door opening 9 on the side of the vehicle body, and the lower end of the intermediate pillar P is coupled to the upper surface of the front and rear intermediate positions. Further, on the vehicle inner side surface of the locker 1, terminals on the vehicle outer side of a plurality of floor cross members 7 extending in the vehicle width direction along the vehicle compartment floor F are coupled. The floor cross member 7 has a substantially hat-shaped cross section, forms a closed cross section with the passenger compartment floor F, and is installed at a position corresponding to the front door opening 8, the intermediate pillar P, and the rear door opening 9 with an interval in the front-rear direction. It is.

  The locker 1 has a closed cross section formed by the reinforcement 2 and the inner panel 11 at a position corresponding to the floor cross member 7 on the front door opening 8 side and a position corresponding to the floor cross member 7 on the rear door opening 9 side, respectively. Are provided with a plurality of bulkheads 3 and 3A. Each of the bulkheads 3 and 3A is formed of a metal plate having a relatively thin plate thickness.

  As shown in FIGS. 1, 2, and 4, the bulkhead 3 on the front door opening 8 side is paired with a predetermined distance in the front and rear according to the front wall terminal and the rear wall terminal of the floor cross member 7. It is provided. Both bulkheads 3 are integrally formed in the front and rear in a U shape in which the inner edge of the vehicle is connected by a plate-like connecting portion 39.

  The bulkhead 3 has an upper edge flange 31, a side edge flange 32, and a lower edge flange 33 that are bent substantially at right angles from the plate surface 30 on the upper edge, the outer edge and the lower edge of the plate surface 30. It is formed. The bulkhead 3 is arranged in the reinforcement 2, and welds 34 provided at intermediate portions of the flanges 31, 32, 33 are respectively connected to the inner surface of the upper wall 21 of the reinforcement 2, the inner surface of the vertical wall 22, and The inner surface of the lower wall 23 is superposed and welded, and the side edge 35 on the inner side of the plate surface 30 is made to face the inner surface of the inner wall 11 in close proximity.

  On the plate surface 30 of the bulkhead 3, the vehicle inner side along a diagonal line connecting the lower edge corner portion of the outer side of the vehicle and the upper edge corner portion of the inner side of the closed section composed of the reinforcement 2 and the inner panel 11. A reinforcing bead 36 extending obliquely upward is formed. The reinforcing bead 36 is formed by pressing the plate surface 30 of the bulkhead 3 so as to have a substantially convex cross section. From the corner between the outer edge and the lower edge of the plate surface 30, the upper edge and the inner side of the vehicle. It is formed in a straight line passing through the substantially center of the plate surface 30 toward the corner between the edges. The width of the reinforcing bead 36 is set to about 10 to 15 mm.

  On the plate surface 30 of the bulkhead 3, circular or oval holes 37 for reducing the weight of the bulkhead 3 are formed at the upper and lower positions of the reinforcing beads 36, respectively. The connecting portion 39 is also provided with a plurality of holes 37.

  Further, the plate surface 30 of the bulkhead 3 is formed with a reinforcing flange 38 extending obliquely upward inward of the vehicle, substantially parallel to the reinforcing bead 36, in the lower half of the vehicle inner side. The reinforcing flange 38 is bent at a substantially right angle from the plate surface 30 and is formed in series with the lower edge flange 33 on the outside of the vehicle.

  FIG. 3 shows a bulkhead 3A provided on the side of the rear door opening 9 in the rocker 3. The pair of front and rear bulkheads 3A are provided with a reinforcing bead 36 extending obliquely upward on the inner side of the plate surface 30 and a lower edge of the plate surface 30. A reinforcing flange 38 is provided in the inner half of the vehicle, and its basic structure is the same as that of the bulkhead 3 on the front door opening 8 side. The front and rear bulkheads 3A are integrally formed in a U shape in which the upper edge of the plate surface 30 is connected by a plate-like connecting portion 39A. Further, a side edge flange 35 is formed on the side edge of the plate surface 30 on the vehicle inner side of the bulkhead 3A.

  Although not shown, the bulkhead 3A is arranged in the reinforcement 2, and the welded portion 34 provided on the connecting portion 39A and the welded portion 34 of each flange 32, 33 are respectively connected to the upper wall of the reinforcement 2. Superposition welding is performed on the inner surface, the inner surface of the vertical wall, and the inner surface of the lower wall, and the side edge flange 35 on the vehicle inner side of the plate surface 30 is disposed in close proximity to the inner surface of the inner wall of the inner panel 11.

As shown in FIG. 1, when a bumper or the like of the opponent vehicle T collides with the door D or the intermediate pillar P at a position higher than the locker 1 at the time of a side collision of the vehicle, Under the influence of the deformation of the pillar P, a collision load (arrow H) is applied to the rocker 1 to pull it up to the vehicle interior side, and the outer panel 10 and the inner panel 11 are significantly affected by the collision load H. Become.

  According to the present embodiment, the reinforcing bead 36 extending obliquely upward on the vehicle interior side is provided on the plate surface 30 of the bulkhead 3 provided in the rocker 1, and the extending direction thereof is matched with the direction of action of the collision load H. The surface rigidity of the plate surface 30 with respect to the collision load H is strengthened, and the bulkhead 3 is not easily crushed and deformed at the time of a side collision. Therefore, the rocker 1 can be minimally collapsed only by the collapse of the closed cross section between the outer panel 10 and the reinforcement 2.

  Since the bulkhead 3 is provided with a reinforcing flange 38 extending obliquely upward inward of the vehicle at the lower edge of the plate surface 30 substantially parallel to the reinforcing bead 36, the reinforcing effect of the reinforcing flange 38 in addition to the reinforcing effect of the reinforcing bead 36 is provided. Therefore, it is possible to reliably prevent the bulkhead 3 from being crushed and deformed at the time of a side collision.

  Further, since the bulkhead 3 is provided in a pair corresponding to the front and rear walls of the floor cross member 7 at a position corresponding to the terminal of the floor cross member 7, a collision load H is applied to the floor cross member 7 and the passenger compartment floor. It can transmit efficiently to the F side and distribute the load over a wide range. In addition, since the front and rear bulkheads 3 are connected to each other by a connecting portion 39, both bulkheads 3 can maintain the parallel installation state at the front and rear positions at the time of a side collision, and more reliably prevent the bulkhead 3 from being crushed and deformed. can do.

  The bulkhead 3A on the rear door opening 9 side in the locker 3 also exhibits the same effect as the bulkhead 3 on the front door opening 8 side at the time of a side collision.

  In addition, the above-mentioned embodiment is an illustration in all points, and does not limit the scope of the present invention, and the present invention includes various modifications and changes to the above-described embodiment. For example, in the above-described embodiment, the reinforcing beads 3 of the plate surface 30 of the bulkheads 3, 3 </ b> A are set as one line, but the present invention is not limited thereto, and two lines may be formed in parallel to the plate surface 30. Further, although a pair of front and rear bulkheads 3 and 3A are provided for each floor cross member 7, a single bulkhead 3 and 3A may be used.

FIG. 5 is a cross-sectional view taken along the line CC of FIG. 4, showing the lower body structure of the present invention. It is a perspective view of the bulkhead used for the vehicle body lower part structure of this invention. It is a perspective view of the other bulkhead used for the vehicle body lower part structure of this invention. It is a principal part perspective view of the vehicle body lower structure to which this invention is applied. It is a perspective view of the bulkhead used for the conventional vehicle body lower part structure. Corresponding to FIG. 1, it is a cross section taken along the line CC of FIG. 4 showing a conventional vehicle lower body structure such as SUV. FIG. 5 is a cross-sectional view taken along line CC of FIG. 4 showing a lower body structure of a conventional ordinary passenger car corresponding to FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rocker 10 Outer panel 11 Inner panel 2 Reinforcement 3, 3A Bulk head 30 Plate surface 36 Reinforcement bead 38 Reinforcement flange 39, 39A Connection part 7 Floor cross member

Claims (4)

In the vehicle body lower structure in which the bulkhead made of a metal plate is installed inside the rocker of the closed section constituting the lower edge of the side surface of the vehicle body so as to partition the closed section in the longitudinal direction of the rocker,
The locker is formed of an outer panel on the vehicle outer side, a reinforcement installed along the inside of the outer panel, and an inner panel on the vehicle inner side,
The bulkhead is installed in a closed cross section formed by the reinforcement and the inner panel,
Straight on the plate surface of the bulkhead along the diagonal line connecting the lower edge corner of the vehicle outer side and the upper edge corner of the vehicle inner side of the closed section formed by the reinforcement and the inner panel. A vehicle body lower structure characterized by providing a reinforcing bead that extends. The vehicle body lower part structure according to claim 1, wherein the bulkhead is formed with a reinforcement flange extending linearly substantially parallel to the reinforcement bead at a lower edge thereof . A pair of bulkheads facing each other in the front-rear position in the rocker are provided, and both bulkheads are connected by connecting portions between the side edges or the upper edges inside the vehicle to form an integrated structure. Item 3. The vehicle body lower structure according to Item 1 or 2. 4. The vehicle body lower structure according to claim 1 , wherein the bulkhead is provided at a position facing a side end portion of a floor cross member extending in the vehicle width direction along the passenger compartment floor .