JP6225653B2 - Lower body structure of the vehicle - Google Patents

Description

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

  In a vehicle, particularly an automobile having a monocoque body, a side sill as a strength member extending in the front-rear direction is joined to the vehicle width direction end portion of the floor panel in order to improve the strength of the lower portion of the vehicle body. Then, the cross member extending in the vehicle width direction is joined to the upper surface of the floor panel, and the end of the cross member in the vehicle width direction is joined to the side sill.

  In order to effectively transmit the load from the side sill to the cross member at the time of a side collision, Patent Document 1 discloses that the upper surface of the cross member includes a connection flange portion that becomes a joint portion with the side sill and extends in the vehicle width direction. It has been proposed to form bead portions. The bead portion is formed so as to be convex upward, and extends long to a straight point in a substantially horizontal direction corresponding to the top surface of the cross member being substantially horizontal.

JP 2008-143292 A

  By the way, in the case of a side collision, the load input to the side sill not only acts in a substantially horizontal direction toward the inner side in the vehicle width direction, but also obliquely downward as it goes upward as it goes inward in the vehicle width direction. The force from The force from the oblique lower side becomes remarkable particularly in the form in which the side sill is pulled by the center pillar when the center pillar is pressed and deformed inward in the vehicle width direction at the time of a side collision.

  However, in the thing of the patent document 1 mentioned above, since it becomes the form in which the force from the said slanting lower part is input largely inclined with respect to the said bead part, this force from the slanting lower part is passed through a bead part. It was difficult to communicate effectively to cross members.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lower body structure of a vehicle that can effectively transmit a load from a side sill to a cross member at the time of a side collision. There is.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1,
A pair of left and right side sills extending in the front-rear direction are joined to the vehicle width direction end of the floor panel,
A cross member extending in the vehicle width direction is joined to the upper surface of the floor panel,
A connecting flange portion extending from the upper surface of the vehicle width direction end portion of the cross member is a lower vehicle body structure of a vehicle joined to the upper surface of the side sill,
At the base end portion of the connection flange portion, it has an inclined portion that is gradually positioned downward toward the outer side in the vehicle width direction and reaches the upper surface of the side sill,
A bead portion extending toward the outer side in the vehicle width direction is formed on the connection flange portion so as to include a vehicle width direction position corresponding to the base end portion of the inclined portion ,
The inclined portion is formed in a portion where the bead portion does not exist in the connection flange portion.
It is like that. According to the above solution, the load input to the side sill at the time of a side collision is transmitted to the cross member via the bead portion and the inclined portion, so that it is more effective than when the load is transmitted only by the bead portion. Load transmission can be performed. In particular, the direction of the force from obliquely downward as it goes inward in the vehicle width direction, which is likely to occur at the time of a side collision, is almost coincident with the direction in which the inclined portion extends, and the force from obliquely below is inclined. It is possible to transmit the cross member to the cross member very effectively.

A preferred mode based on the above solution is as described in claim 2 in the scope of claims . That is,
The side sill has a corner portion constituted by its upper surface and a longitudinal surface on the inner side in the vehicle width direction,
The upper surface of the cross member is higher than the height of the corner,
It is like that. In this case, the lower end of the inclined portion can be firmly supported in the vicinity of the corner portion of the side sill, which is preferable for more fully exhibiting the effect corresponding to the first aspect. Further, by making the upper surface of the cross member higher than the corner portion, it is preferable for securing the cross-sectional area of the cross member.

  According to the present invention, the load from the side sill can be effectively transmitted to the cross member at the time of a side collision.

The simplified perspective view which looked at the center pillar vicinity of the vehicle to which this invention was applied from the vehicle interior side. The principal part perspective view which shows the junction part of a side sill and a cross member. The top view which shows the junction part of a side sill and a cross member. The perspective view which shows the junction part of the center pillar and side sill in the state which removed the side sill outer. FIG. 4 is a cross-sectional view corresponding to line X5-X5 in FIG. 3. The principal part expanded sectional view of FIG. FIG. 4 is a cross-sectional view corresponding to line X7-X7 in FIG. 3; X8-X8 line equivalent sectional drawing of FIG. Sectional drawing which shows the 2nd Embodiment of this invention and respond | corresponds to FIG.

  In FIG. 1, 1 is a floor panel which comprises a vehicle compartment floor surface. The ends in the vehicle width direction of the floor panel 1 are joined to a pair of left and right side sills 2 extending in the front-rear direction (the left side sills are not shown in FIG. 1). A tunnel portion 1 a that protrudes upward is formed in the vehicle width direction intermediate portion of the floor panel 1.

  Cross members 3, 4 extending in the vehicle width direction are joined to the upper surface of the floor panel 1 so as to connect the tunnel portion 1 a and the side sill 2. The lower part of the center pillar 5 is joined to the side sill 2. A front space of the center pillar 5 is a door opening 6 for the front seat, and a rear space of the center pillar 5 is a door opening 7 for the rear seat. The front cross member 3 is positioned at a substantially intermediate portion in the front-rear direction of the door opening 6. The rear cross member 4 is set at a position corresponding to the center pillar 5. As is well known, the cross member 3 is formed in a U-shaped cross section that opens downward as shown in FIG. 2, and forms a closed cross section in cooperation with the floor panel 1. (The same applies to the cross member 4).

  Next, a structural example of the side sill 2 will be described with reference to FIG. First, 11 is a side sill inner, 12 is a side sill outer, and 13 is a side sill rain, and has a large closed cross-sectional structure extending in the front-rear direction as a whole. A reinforcing plate 14 extending in the front-rear direction is joined from the lower portion of the outer side surface of the side sill rain 13 to the lower surface at the joint portion of the center pillar 5 (see also FIG. 4). Further, a node member 15 is disposed in the side sill 2 so as to partition the closed cross section of the side sill 2 in the front-rear direction. The side sill inner 11 has an upper surface 11a that is slightly inclined so as to be positioned downward toward the inner side in the vehicle width direction, and a vertical surface 11b that extends substantially straight downward from the inner side end in the vehicle width direction of the upper surface 11a. The corners of the upper surface 11a and the vertical surface 11b are denoted by reference numeral 11c.

  The present invention is applied to the joining structure of the cross member 3 to the side sill 2, and this joining structure will be described below. First, the height of the upper surface of the cross member 3 is set so as to be positioned slightly higher than the corner portion 11c of the side sill inner 11 as a whole. Further, the upper surface of the cross member 3 is set to be slightly inclined so as to gradually increase toward the front. Such an upper surface inclination setting is suitable for mounting a front seat, not shown.

  A connection flange portion 20 extends from the upper surface of the end portion in the vehicle width direction of the cross member 3 toward the outer side in the vehicle width direction. The connection flange portion 20 is joined to the upper surface 11a of the side sill inner 11 of the side sill 2, for example, by spot welding.

  The connection flange portion 20 is formed with a bead portion 21 extending in the vehicle width direction at a substantially middle portion in the front-rear direction. The bead portion 21 has a substantially semicircular cross section so as to protrude upward. The node member 15 is disposed at a position corresponding to the connection flange portion 20 (more specifically, a position corresponding to the bead portion 21). In addition, the arrangement | positioning position and arrangement | positioning number of the node member 15 can be set suitably.

  In front of the bead part 21, an inclined part 22 is formed at the base end part (the inner side end part in the vehicle width direction) of the connection flange part 20. As shown in FIGS. 2, 3, 5, and 6 (particularly FIGS. 5 and 6), the inclined portion 22 is inclined so as to be gradually positioned downward toward the outer side in the vehicle width direction. The lower end thereof is in contact with the upper surface 11 a of the side sill inner 11. The connection flange portion 20 is joined to the upper surface 11 a of the side sill inner 11 on the outer side in the vehicle width direction than the inclined portion 22. In addition, since the upper surface of the cross member 3 is inclined and set so as to rise forward, the length of the inclined portion 22 is slightly longer than the rear portion.

  The bead portion 21 is shortened in the vehicle width direction so as to be formed only in the connection flange portion 20. That is, the position of the inner side end of the bead portion 21 in the vehicle width direction is a position substantially corresponding to the inner side end position of the inclined portion 22 in the vehicle width direction. Further, the vehicle width direction outer side end of the bead portion 21 is coincident with the vehicle width direction outer side end of the connection flange portion 20.

  As shown in FIG. 8, the rear portion of the connection flange portion 20 than the bead portion 21 is joined to the upper surface 11 a of the side sill inner 11 without forming the inclined portion 22. As described above, since the upper surface of the cross member 3 is slightly inclined so as to gradually increase toward the front, the connecting flange portion 20 extending from the upper surface of the cross member 3 has a front portion thereof. In FIG. 5, the upper surface 11a of the side sill inner 11 has a relatively large space in the vertical direction, and the inclined portion 22 is formed so as to fill this space. On the other hand, since the rear portion of the connection flange portion 20 is lower than the bead portion 21, the side sill inner is formed from the inner end of the connection flange portion 20 substantially in the vehicle width direction without forming the inclined portion 22. 11 is brought into contact with the upper surface 11a of the motor.

  Here, in the case of a side collision, in addition to a force (load) that acts substantially horizontally on the side sill 2 toward the inner side in the vehicle width direction, as shown in FIG. Act. The force F from the oblique lower side is that the side sill 2 receives a tensile force from the center pillar 5 as the center pillar 5 tends to be deformed toward the inner side in the vehicle width direction at the time of a side collision. As a result, it acts as a large force.

  The force F from the oblique lower side is considerably inclined with respect to the bead part 21, so that it is difficult to transmit the load to the cross member 3 through the bead part 21. On the other hand, the inclined portion 22 extends in substantially the same direction as the direction in which the force F from the obliquely lower side acts. It will be transmitted very effectively. As described above, by forming the inclined portion 22 in addition to the formation of the bead portion 21, it becomes possible to more effectively transmit the load at the time of a side collision to the cross member 3.

  FIG. 9 shows a second embodiment of the present invention and is a cross-sectional view corresponding to FIG. In the present embodiment, the bead portion 21 is formed so as to have an upward protruding height that is longer than that in the case of FIG. 6 and is extended longer by extending inward in the vehicle width direction. I have to do it. That is, the bead portion 21 is formed so as to extend further inward in the vehicle width direction than the position inward in the vehicle width direction of the inclined portion 22. According to this embodiment, the load from the side sill at the time of a side collision can be transmitted to the cross member 3 more effectively.

  Although the embodiments have been described above, the present invention is not limited to the embodiments, and appropriate modifications can be made within the scope of the claims. The bead part 21 may be extended longer than the connection flange part 20 toward the inner side in the vehicle width direction. The bead portion 21 may be formed so as to protrude downward. In this case, the upper surface 11a of the side sill inner 11 corresponds to a portion of the bead portion 21 formed on the connection flange portion 20. A recess can also be formed at the position. In particular, when the bead portion 21 is formed to be linearly long from the connection flange portion 20 to the upper surface of the cross member 3, the connection flange portion 20 is formed so as to protrude upward, while the upper surface of the cross member 3 is formed. (Parts other than the connecting flange portion 20) may be formed so as to protrude downward. It is preferable not to form an upward protrusion on the upper surface of the cross member 3 in seat mounting or the like.

  You may form the upper surface of the cross member 3 as substantially horizontal, without setting it as the inclination of a front rise. A pair of front and rear inclined portions 22 may be formed with the bead portion 21 interposed therebetween. Further, the bead portion 21 is formed at a position offset from the front-rear direction intermediate position of the connection flange portion 20 to the front side or the rear side, and the inclined portion is formed long in the front-rear direction at a portion where the bead portion 21 does not exist. May be. As with the cross member 3, the bead portion 21 and the inclined portion 22 may be formed for the other cross members 4. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention can provide a suitable vehicle for a side collision.

1: Floor panel 2: Side sill 3: Cross member 5: Center pillar 11: Side sill inner 11a: Upper surface 11b: Vertical surface 11c on the inner side in the vehicle width direction: Corner portion 20: Connection flange portion 21: Bead portion 22: Inclined portion

Claims (2)

A pair of left and right side sills extending in the front-rear direction are joined to the vehicle width direction end of the floor panel,
A cross member extending in the vehicle width direction is joined to the upper surface of the floor panel,
A connecting flange portion extending from the upper surface of the vehicle width direction end portion of the cross member is a lower vehicle body structure of a vehicle joined to the upper surface of the side sill,
At the base end portion of the connection flange portion, it has an inclined portion that is gradually positioned downward toward the outer side in the vehicle width direction and reaches the upper surface of the side sill,
A bead portion extending toward the outer side in the vehicle width direction is formed on the connection flange portion so as to include a vehicle width direction position corresponding to the base end portion of the inclined portion ,
The inclined portion is formed in a portion where the bead portion does not exist in the connection flange portion.
A lower body structure of a vehicle characterized by that. In claim 1,
The side sill has a corner portion constituted by its upper surface and a longitudinal surface on the inner side in the vehicle width direction,
The upper surface of the cross member is higher than the height of the corner,
A lower body structure of a vehicle characterized by that.