JP4290144B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure having a cross member.

  Conventionally, in a vehicle using a floor panel formed by pressing a thin plate material, a bead is provided at the time of press molding of the floor panel to secure necessary rigidity, or other members such as a frame are integrated. There are things that are combined. Further, in order to increase the bending rigidity in the vehicle width direction, cross members extending in the vehicle width direction are arranged at appropriate positions.

For example, a cross member is provided between the left and right wheel houses, a lower member of the cross member is provided below the floor panel, an upper member is provided above the floor panel, and the members are welded together to control the wheel house. Some have improved the vibration effect (see, for example, Patent Document 1).
Japanese Patent No. 3434069

  On the other hand, some cross members are formed by joining members having L-shaped cross-sections so as to form a rectangular closed cross-section. Although the closed cross-sectional structure can increase the bending rigidity, there is a demand for further increasing the rigidity in order to enhance the vibration damping effect. In that case, for example, a plate material having a shape matched to a triangle shape between both sides sandwiching the corner in the L-shaped cross-sectional shape is separately created, and the plate material is welded to each side to form a bulkhead structure. Thus, the rigidity of the cross member can be increased.

  However, since the above plate material is a separate part, not only the number of parts increases, but also the welding work is required, so that the parts management becomes complicated and the manufacturing cost rises, and the productivity deteriorates. was there.

In order to solve such a problem and increase the rigidity of the cross member without deteriorating productivity, in the present invention, the left and right side sill extensions (5) extend in the vehicle width direction. a vehicle body structure having a cross member (10) provided between said cross member (10) is a thin plate middle floor stiffener (4) that by pressing the joining mid floor cross member (9) with each other And the mid-floor cross member (9) is formed in an L-shaped cross-sectional shape having at least one corner in the rectangular closed cross-section , and is located across the one corner. so as to intersect the longitudinal direction, the mid-floor cross member (9) to the press molding of the walls (9b · 9c) the mid-floor cross member between (9) to Wherein when at the same time to form mid-floor has a longitudinal end portion formed vertical wall of the cross member (9) (14), said longitudinal end and the longitudinal ends of the mid-floor crossmember (9) The opposing side sill extensions (5) are integrated with each other via a connecting member (11) having an L-shaped cross section so that the rectangular closed cross section is continuous, and above the mid floor stiffener (4). A wall portion (4b) is connected to the side sill extension (5) so as to be continuous, and a support member (12) for supporting a part (13) of the rear wheel suspension device is attached to the connection member (11). It was assumed to have.

In particular, before Kitatekabe (14), each said included angle between said walls (9b · 9c) of the mid-floor cross member (9) (.theta.1 · .theta.2) is formed so as to be obtuse And good.

  As described above, according to the present invention, in one member constituting a cross member having a rectangular closed cross section, a vertical wall provided between both walls located at least one corner of the rectangular closed cross section is pressed with the one member. By forming at the same time as molding, it is possible to provide a vertical wall for enhancing the rigidity of the cross member without using separate parts, so that the number of parts does not increase and the manufacturing cost in the structure in which the vertical wall is provided is reduced. Cost can be reduced and productivity can be improved.

  In particular, when a vertical wall is provided at the longitudinal end portion of the cross member, the vertical wall is formed at the end portion of the material. When the thin plate material is press-molded to form one member of the cross member, the vertical wall is formed. Walls can be easily formed simultaneously. In addition, by making each angle (the included angle) formed by the vertical walls with respect to both walls of one member an obtuse angle, simultaneous formation of the vertical walls by press molding is facilitated, and the vertical walls are inclined with respect to the wall of one member The rigidity is increased by being positioned in the position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a main part of a vehicle body structure to which the present invention is applied. In the figure, the right rear portion of the vehicle 1 is shown, and the left rear portion is not shown because it is symmetrical.

  In the illustrated vehicle body structure, a front floor panel 2 that mainly forms the floor of the passenger compartment is provided, and side sills 3 are provided so as to extend in the vehicle front-rear direction at both side edges of the front floor panel 2. It has been. Further, a middle floor stiffener that is joined to the rear end portion of the front floor panel 2 and is formed so as to form a partition that partitions between the passenger compartment and the rear trunk and extends rearward at the upper portion. 4, a side sill extension 5 as a side member is connected to the rear end of the side sill 3, and a rear frame 6 extending rearward is joined to the rear end of the side sill extension 5. Yes. A rear floor panel 7 is joined to upper rearward extending ends of the rear frame 6 and the middle floor stiffener 4. A trunk room 8 is formed behind the rear floor panel 7 by the rear frame 6 and the panel.

  As shown in FIG. 2, a mid floor cross member 9 having a substantially L-shaped cross-section is joined to the upper corner portion of the middle floor stiffener 4. The mid-floor cross member 9 has a substantially L-shaped cross section, as shown in the figure, and has flange portions 9a bent outward at substantially right angles at both ends thereof in the vehicle width direction. It is formed in a long shape.

  As described above, the middle floor stiffener 4 has a partition wall 4a that partitions the compartment and the rear trunk, and is bent at a substantially right angle to the rear of the vehicle at the upper end of the partition wall 4a and extends to the rear of the vehicle with a predetermined length. And a rearward extending portion 4b. The flange portions 9a are spot-welded to the partition wall portion 4a and the rear extension portion 4b, respectively, and the mid floor cross member 9 and the middle floor stiffener 4 form a rectangular closed cross member 10. The cross member 10 is provided extending in the vehicle width direction.

  As shown in FIG. 3, the longitudinal direction (vehicle width direction) end of the cross member 10 has a portion (4b) corresponding to the upper wall with respect to the side sill extension 5 having a rectangular closed cross-sectional shape. The portion (one wall 9b of the mid-floor cross member 9) that is joined at the portion and connected to the lower wall is connected via the connection member 11.

  As shown in FIG. 4, the connecting member 11 may be a member formed by press-molding a thin plate material to have an L-shaped cross-section, and includes a longitudinal end of the mid floor cross member 9, a side sill extension 5, It is provided to connect between the two. One end of the connecting member 11 is joined to the cross member 10 and the other end is joined to the side sill extension 5 by spot welding. As with the mid floor cross member 9, the connecting member 11 also has a flange portion 11 a as shown in FIG. 3 with respect to the partition wall portion 4 a so as to form a rectangular closed section together with the corresponding portion of the middle floor stiffener 4. The flange part 11a is similarly joined also to the back extension part 4b.

  Further, in the illustrated example, a supporting member 12 including a pair of left and right walls and a pin extending between the two is fixed to the lower surface of the connection member 11 and in the vicinity of the side sill extension 5. A trailing arm 13 for a rear wheel as a suspension device is connected to the support member 12 via a pin.

  In the structure described above, since the trailing arm 13 is connected to the portion where the support member 12 is provided, vibration is easily transmitted from the trailing arm 13 to the cross member 10. In the illustrated example, the mid-floor cross member 9 directly connected to the connecting member 11 is affected.

  According to the present invention, at the end in the longitudinal direction of the mid-floor cross member 9 as one member constituting the cross member 10, as shown in FIG. A vertical wall 14 having a bulkhead structure is provided between both walls 9b and 9c located with (arrow A) interposed therebetween. FIG. 4 is an enlarged perspective view of a main part of the portion indicated by the arrow IV line in FIG.

  The vertical wall 14 can be formed as a wall that intersects the longitudinal direction of the cross member 10 by press-molding the end of the thin plate material at the same time when the mid floor loss member 9 is formed by press molding. As shown in the figure, the vertical wall 14 extends between both walls 9b and 9c of the mid-floor cross member 9 having a substantially L-shaped cross section, and is open in the longitudinal direction of the mid-floor cross member 9 having a substantially L-shaped cross section. It is formed in a triangular shape so as to shield the surface. Two triangular sides are continuous with the walls 9b and 9c, and a flange portion 14a bent substantially at a right angle is formed on the edge corresponding to the remaining open side, and is continuous with both flange portions 9a. As a result, the strength of the vertical wall 14 is increased.

  Furthermore, the vertical wall 14 is formed so that the angles (the included angles) θ1 and θ2 formed by the vertical wall 14 and the walls 9b and 9c are obtuse angles. By making the obtuse angle in this way, when the vertical wall 14 is processed by press molding, the formation becomes easy and the vertical wall 14 obliquely intersects the walls 9b and 9c. The bending rigidity with respect to each included angle direction can be increased.

  Since the vertical wall 14 is integrally provided at the longitudinal end portion of the cross member 10 in this manner, the rigidity of the portion of the cross member 10 can be increased. When a part (trailing arm 13) is connected, it is possible to enhance the damping effect on vibration transmission from the suspension device side. Further, without forming the vertical wall 14 by welding another part, the mid-floor cross member 9 as one part constituting the cross member 10 can be formed by press molding at the same time when it is formed by press molding. Therefore, the number of parts does not increase, the manufacturing cost in the structure in which the vertical wall 14 is provided can be reduced, and the productivity can be improved.

  In the illustrated example, the rear body structure of the vehicle body is shown. However, any vehicle body structure provided with a cross member may be used, and the structure can be similarly applied to the front body structure of the vehicle body.

  The vehicle body structure according to the present invention can increase the rigidity of the cross member without using separate parts, and is useful for a vehicle body structure provided with a cross member.

It is a principal part perspective view which shows the vehicle body structure of the motor vehicle to which this invention was applied. It is the principal part expanded sectional view seen along the arrow II-II line | wire of FIG. It is the principal part expanded sectional view seen along the arrow III-III line of FIG. It is a principal part expansion perspective view of the part seen from the arrow IV line of FIG.

Explanation of symbols

4 Middle floor stiffener
5 Side sill extension (side member)
9 Mid-floor cross member
9b / 9c Wall 10 Cross member 11 Connection member 12 Support member 13 Trailing arm (part of rear wheel suspension device)
14 Vertical wall θ1, θ2

Claims (2)

A vehicle body structure having a cross member (10) extending in the vehicle width direction and provided between the left and right side sill extensions (5) ,
The cross member (10) has a rectangular closed cross section formed by joining together a middle floor stiffener (4) and a mid floor cross member (9) formed by pressing a thin plate material,
The mid-floor cross member (9) is formed in an L-shaped cross-sectional shape having at least one corner in the rectangular closed cross section , and between the two walls (9b, 9c) located across the one corner. so as to intersect with the longitudinal direction of the mid-floor cross member (9), is formed simultaneously in the longitudinal end of the mid-floor cross member (9) when formed by press-molding the mid floor cross member (9) A vertical wall (14)
A connecting member having an L-shaped cross section such that the rectangular closed cross section is continuous between the longitudinal end of the mid floor cross member (9) and the side sill extension (5) facing the longitudinal end. 11) and are connected to each other so that the upper wall portion (4b) of the mid floor stiffener (4) is continuous with the side sill extension (5),
A vehicle body structure, wherein a support member (12) for supporting a part (13) of a rear wheel suspension device is attached to the connection member (11) . The vertical wall (14) is formed such that each included angle (θ1 · θ2) between the mid-floor cross member (9) and the both walls (9b, 9c) is an obtuse angle. The vehicle body structure according to claim 1.

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