JPH10244958A - Side structure of automobile body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the torsional deformation of a front pillar and also generate a fix end member to a sidesill, reduce the bending of a center pillar and increase the absorption energy at the side impact time of the front pillar. SOLUTION: In the lower part of a front pillar 3, a first reinforcing plate 11 having a shell wall shape reinforcing plate structure on at least one place or more in addition to an upper end and lower end is provided inside a closed section structure member formed with an outer panel 3a and inner panel 3b. One surface of the first reinforcing plate 11 is fixed to the inner panel 3b and the remaining three surfaces are fixed to the outer panel 3a by one way welding. Further, a second reinforcing plate 12 is installed and a bracket shape third reinforcing plate is installed on the lowest part to improve the force transmission from the sidesill.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vehicle body structure,
It relates to a structure that rationally transmits force from the center pillar to the front pillar via the side sill.

[0002]

2. Description of the Related Art As a conventional vehicle body side structure, for example, there is one shown in FIG.

[0003] A conventional structure for connecting the center pillar 1, side sills 2, and front pillars 3 of a vehicle body is constituted by a frame structure of a closed cross-section member formed of a thin plate (press plate). For such a structure, there is an example in which a reinforcing member 5 and the like are arranged in the side sill 2 in order to suppress the penetration of the center pillar 1 at the time of a side collision (FIG.
3-97473, JP-A-4-81371, JP-A-4-6
7190). With this structure, the transmission of the force to the center pillar 1 and the side sill 2 and further to the front pillar 1 is improved, but the load on the front pillar 1 becomes excessive (FIG. 7).
In order to withstand the penetration of the lower part of the front pillar 3, that is, the bending deformation, the front pillar has a double structure or a structure in which a reinforcing plate 6 is provided (FIG. 9, Japanese Utility Model Application Laid-Open No. 62-114879). Thereby, the bending strength against the pushing force of the lower part of the front pillar 3 can be improved. In FIG. 5, reference numeral 4 denotes a rear side member.

[0004] In addition, there is a front door held by a front pillar. A brace (bulk head) 8 may be arranged on a door hinge 7 connecting the front door 3 and the front pillar 3. In general, the brace 8 is installed in order to suppress local deformation of the thin-walled front pillar wall surface with respect to the door's own weight, and to secure door mounting rigidity. Therefore, when the front pillar does not sufficiently function to secure the bending or torsional rigidity of the entire front pillar, and the weight needs to be further reduced, a structure in which the inside is cut out can be seen (FIG. 10).

[0005]

However, in such a conventional vehicle body side structure, at the time of a side collision, the load transmitted from the center pillar to the side sill is received only by the lower portion of the front pillar as a pushing force. However, since the structure is resistant to the bending strength of the front pillar, there is a problem that the structure becomes complicated and the weight increases.

The present invention has been made in view of such a conventional problem. In order to increase the role of energy absorption of the front pillar at the time of a collision, the present invention sufficiently resists torsional deformation, and furthermore, this deformation. It is an object of the present invention to solve the above-mentioned problem by incorporating a function of absorbing energy accompanying the above into the front pillar and increasing the fixed end moment of the front end of the side sill.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a thin-walled closed-section skeleton structure in which a side sill and a lower portion of a front pillar are rigidly connected. At least one bulkhead (shell wall) is provided in addition to the end, and the bulkhead is firmly held on the front pillar wall surface, so that deformation of the entire cross section of the front pillar can be restrained.

Further, the present invention has a reinforcing structure having a structure with a reinforcing plate inside the front pillar in order to firmly hold the bulkhead inside the front pillar.

Further, the present invention provides a front pillar reinforcing structure having an internal structure having an energy absorbing function for torsional deformation of the front pillar inside the front pillar.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, parts that are the same as parts and members used in the related art will be described with the same reference numerals.

(First Embodiment) FIG. 1 is a diagram showing a first embodiment of the present invention. First, the structure will be described. In the lower part of the front pillar 3, the outer panel 3
In addition to the upper and lower ends, a member having a shell-wall-shaped auxiliary plate structure is arranged at least at one or more places inside the thin-walled closed-section structural member formed by the inner panel 3a and the inner panel 3b (first reinforcing plate 11). . The first reinforcing plate 11 is incorporated into the inner panel 3b by welding. Further, the shell wall structure by the first reinforcing plate 11 is
After being assembled in the inner panel 3b, the remaining three surfaces are fixed to the outer panel 3a by one-way welding so that they are firmly held in the respective cross sections.
In order to improve the appearance of the outer panel 3a, a second reinforcing plate 12 is further provided. Furthermore, when the inside has a double structure, in order to improve the transmission of the force from the side sill, a third reinforcing plate in the form of a bracket is installed at the bottom to increase the coupling rigidity between the front pillar 3 and the side sill. Have.

Next, the operation of the first embodiment will be described. By installing a shell-wall (bulkhead) -like reinforcing plate 15 as shown in FIG. 3 inside the front pillar, the torsion deformation of the front pillar 3 can be changed in cross-section at the end and the middle, and the pillar configuration. In-plane sled (w
apping) to improve apparent stiffness relative to the previous free-end (unconstrained) pillar (FIG. 2). This has the effect of changing the boundary conditions of the member, in addition to improving the performance of the rigidity itself as the member.
With the above operation, it is possible to increase the bending moment of the fixed end of the front end of the side sill 2 and to reduce the maximum bending moment generated in the side sill 2, thereby suppressing the intrusion of the lower end of the center pillar. There is an effect (FIG. 8).

Further, with this structure, a part of the energy absorption that has been borne by other parts of the vehicle body (side sills, center pillars, doors, etc.) can be rationally borne by the front pillar, and the movement of the collision object It has the effect of reducing energy (penetration speed).

(Second Embodiment) FIG. 4 shows a second embodiment. In the second embodiment, an aluminum extruded material 21 and a steel rod 22 are used as the shell wall structure of the first embodiment.
It consists of. Extruded aluminum 2 as well as shell wall structure
The internal structure 1 has the same effect by restraining the cross-sectional deformation inside the pillar, and the function similar to the solid rod can be made a hollow structure, so that there is an effect of suppressing an unnecessary increase in weight. This reinforcing structure is incorporated in the front pillar inner panel. In FIG. 4, reference numeral 16 denotes a reinforcing panel.

[0015]

As described above, according to the present invention, the structure of the shell wall structural member firmly held in each cross section of the thin-walled closed cross-sectional structure (the inner panel and the outer panel) of the front pillar is provided. In addition, since the front pillar and side sill have a reinforcing structure that increases the joint rigidity, the torsional rigidity of the front pillar is increased, torsional deformation is suppressed, and a fixed end moment is generated on the side sill directly connected to the front pillar, reducing the maximum bending moment. Therefore, it is possible to reduce the deflection (the amount of penetration of the center pillar) and to increase the energy absorbed by the front pillar at the time of a side collision.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of cross-sectional deformation and warp restraint of a front pillar.

FIG. 3 is a conceptual diagram of the structure of the present invention.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a side view of a conventional automobile body structure.

FIG. 6 is a diagram (I) of a conventional vehicle body side reinforcing structure.

FIG. 7 is a side sill load state diagram at the time of a side collision.

FIG. 8 is a side sill load state diagram according to the present invention.

FIG. 9 is a diagram (II) of a conventional vehicle body side reinforcing structure.

FIG. 10 is a diagram (III) showing a conventional vehicle body side reinforcing structure.

Claims (3)

[Claims] 1. A side structure of an automobile body, wherein a side sill and a lower portion of a front pillar are rigidly connected to each other in a thin-walled closed-section skeleton structure, and a bulkhead is provided inside the front pillar at at least one position in addition to upper and lower ends. A front pillar reinforcement structure characterized in that the head is firmly held on the front pillar wall surface so that deformation of the cross section of the entire front pillar can be restrained. 2. The reinforcing structure according to claim 1, wherein a reinforcing plate is provided inside the front pillar to firmly hold a bulkhead inside the front pillar. 3. A front pillar reinforcement structure having an internal structure having an energy absorbing function for torsional deformation of the front pillar inside the front pillar.