JP3656386B2 - Connecting structure of front pillar and side sill of automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a front pillar and a side sill of an automobile, and in particular, a connection in which a vertical reinforcement that divides the closed cross section into left and right is arranged in a closed cross section of a joint portion between a front pillar and a side sill. Regarding the part structure.
[0002]
[Prior art]
FIGS. 4 to 6 show a joint portion between the front pillar 1 and the side sill 2 which is a subject of the present invention. The pillar outer 1a and the sill outer 2a are integrally formed by press molding, and the side sill 2 includes the sill outer 2a and the sill inner 2b. The upper and lower alignment flanges 3, 4, and front alignment flange 5 are joined together.
[0003]
An upper edge flange 8, a lower edge flange 9, and a front edge flange 10 are provided in the closed cross-section portion 6 of the joint portion between the front pillar 1 and the side sill 2, and the upper alignment flange 3, the lower alignment flange 4, and the like. Reinforces 7 are sandwiched and joined to the front-side alignment flange 5 to divide the closed section 6 into left and right.
[0004]
The reinforcement 7 has extended portions 7a and 7b extending toward the upper side of the front pillar 1 and the rear side of the side sill 2 so that the reinforcing region is relatively wide. The lower edge of the part is joined to the upper extension part 7 a of the reinforcement 7.
[0005]
The lower alignment flange 4 of the side sill 2 is offset outward with respect to the upper alignment flange 3 and the front alignment flange 5 on the extension of the upper alignment flange 3, and the front side portion of the lower alignment flange 4 is The front side flange 5 is continuous with a gentle curve.
[0006]
Accordingly, the reinforcement 7 has an upper edge flange 8, a lower edge flange 9, and a front edge flange 10 that can be aligned with the corresponding upper alignment flange 3, lower alignment flange 4, and front alignment flange 5 of the side sill 2. 7 is formed as a three-dimensionally twisted panel surface as shown in the conceptual diagram of FIG.
[0007]
[Problems to be solved by the invention]
When a bending moment acts in the front-rear direction as shown by an arrow M in FIG. 4 when the vehicle is traveling or the like, the front pillar 1 and the side sill 2 are closed. As shown by an arrow δ in the figure, the maximum shearing stress acts at an angle of 45 ° with respect to the main stress line, but the reinforcement 7 is twisted three-dimensionally as described above. Since it is molded as a panel surface, the panel surface of the reinforcement becomes a curved surface with respect to the line of action δ of the maximum shear stress (see FIG. 7), so that the panel rigidity of the reinforcement 7 tends to be insufficient. In order to compensate for this, it is necessary to increase the thickness of the reinforcement 7, which is disadvantageous in terms of cost and weight.
[0008]
Therefore, the present invention can increase the panel rigidity without increasing the thickness of the reinforcement, and can secure the rigidity of the connecting portion between the front pillar and the side sill. A partial structure is provided.
[0009]
[Means for Solving the Problems]
In the invention of claim 1, the lower alignment flange is offset outward or inward with respect to the upper alignment flange of the sill outer and the sill inner and the front alignment flange on the extension of the upper alignment flange, and the lower The upper and lower edge flanges and the front edge flange are aligned with the upper side of the side sill in the closed section of the joint where the front sill is connected to the side sill where the front side of the side alignment flange gently continues to the front side flange. In a structure in which a reinforcement is provided that is sandwiched and joined to the flange, the lower alignment flange, and the front alignment flange to divide the closed cross section of the joint portion into left and right, the front pillar and the side sill of the reinforcement are closed. Front and rear around the joint between these front pillars and side sills at the position where the cross-sections intersect It is characterized in that the formation of the drag surface to be linear with respect to the action line direction of the maximum shear stress acting on the reinforcement by countercurrent bending moment.
[0010]
The invention according to claim 2 is characterized in that the drag surface according to claim 1 is formed across the molding bases of the upper edge flange and the lower edge flange of the reinforcement.
[0011]
In the invention of claim 3, a reinforcing concave portion is formed on the drag surface according to claims 1 and 2, and the concave bottom surface of the recess is formed in parallel with the drag surface. It is a feature.
[0012]
【The invention's effect】
According to the first aspect of the present invention, the reinforcement disposed in the closed cross section of the joint portion between the front pillar and the side sill includes the front pillar at a position where the closed cross sections of the front pillar and the side sill intersect. A drag surface that is linear with respect to the direction of the maximum shear stress acting on the reinforcement is formed by the longitudinal bending moment around the joint with the side sill, so a large drag against the shear load can be obtained. Thus, the panel rigidity can be increased without increasing the plate thickness, and the rigidity of the joint portion between the front pillar and the side sill can be advantageously increased in terms of cost and weight.
[0013]
According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the molding base portion of the upper edge flange in which the drag surface of the reinforcement is sandwiched and joined to the upper alignment flange of the side sill, Since it is formed over the entire area of the effective length of the reinforcement between the base of the lower edge flange clamped and joined to the lower flange, the rigidity of the joint between the front pillar and the side sill is further increased. Can do.
[0014]
According to the third aspect of the present invention, in addition to the effects of the first and second aspects of the invention, since the reinforcing surface is formed with a concave portion for reinforcement, the surface rigidity of the reinforcement is increased. In addition to being formed, the concave bottom surface of the concave portion is formed in parallel with the drag surface to hold the drag surface, so that the rigidity of the joint portion between the front pillar and the side sill can be further increased.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
As shown in FIGS. 4 to 6, the side sill 2 coupled to the front pillar 1 has the lower alignment flange 4 offset to the outside with respect to the upper alignment flange 3 and the front alignment flange 5 on its extension. The front side portion of the lower mating flange 4 is continuously formed on the front mating flange 5 with a gentle curve, and within the closed cross section 6 of the connecting portion between the front pillar 1 and the side sill 2. The upper edge flange 8, the lower edge flange 9, and the front edge flange 10 are respectively clamped and joined to the upper alignment flange 3, the lower alignment flange 4, and the front alignment flange 5 of the side sill 2, and The basic structure in which the reinforcement 7A that divides the closed section into left and right is provided is the same as described above.
[0017]
Here, the reinforcement 7A has the upper edge flange 8, the lower edge flange 9 and the front edge flange 10 as the upper alignment flange 3, the lower alignment flange 4, and the front alignment flange 5 of the side sill 2, as described above. For the purpose of alignment, basically, the front side portion of the reinforcement 7A is formed as a three-dimensionally twisted panel surface in the same manner as the conventional reinforcement 7 shown in the conceptual diagram of FIG. At the position where each closed cross section of the front pillar 1 and the side sill 2 of 7A intersects, as shown in the conceptual diagrams of FIGS. Thus, a drag surface 11 is formed that is linear with respect to the direction of the maximum shear stress acting on the reinforcement 7A.
[0018]
Specifically, as described above, when a bending moment acts in the front-rear direction as shown by the arrow M in FIG. 4 when the vehicle is traveling, the front pillar 1 and the side sill 2 are joined. Since the maximum shearing stress acts at an angle of 45 ° with respect to the main stress line as shown by an arrow δ in the figure at the position where each closed cross section of the pillar 1 and the side sill 2 intersects, the drag set for the part is set. The surface 11 is formed so as to be straight with respect to the direction of the maximum shear stress acting line δ.
[0019]
The drag surface 11 is formed between the molding base portions 8a and 9a of the upper edge flange 8 and the lower edge flange 9 of the reinforcement 7A.
[0020]
In the present embodiment, a plurality of reinforcing recesses 12, 13, 14, and 15 are embossed on the drag surface 11 and the rear extension 7b of the reinforcement 7A to increase the surface rigidity of the reinforcement 7A. However, the concave bottom surfaces 12 a and 13 a of the concave portions 12 and 13 formed on the drag surface 11 are formed in parallel with the drag surface 11.
[0021]
2A to 2F show cross sections along the maximum shear stress action line δ corresponding to positions AA to FF in FIG. 1, and FIG. A general surface including the upper edge flange 8, the lower edge flange 9, and the front edge flange 10 of the reinforcement 7 </ b> A, and the bottom surface of the drag surface 11 and the recesses 12 and 13 provided on the drag surface 11 from the sectional view of FIG. It is understood that the surface shapes of the molding surfaces 12a and 13a have changed.
[0022]
According to the structure of the above embodiment, the reinforcement 7A disposed in the closed cross section of the joint portion between the front pillar 1 and the side sill 2 is located at a position where the closed cross sections of the front pillar 1 and the side sill 2 intersect. Since the drag surface 11 is formed in a straight line with respect to the direction δ of the maximum shear stress acting on the reinforcement 7A by the longitudinal bending moment around the joint portion of the front pillar 1 and the side sill 2, the shear load is formed. The panel rigidity can be increased without increasing the plate thickness, and the rigidity of the joint portion between the front pillar 1 and the side sill 2 can be advantageously increased in terms of cost and weight. it can.
[0023]
In particular, the drag surface 11 includes a molding base portion 8a of the upper edge flange 8 of the reinforcement 7A that is sandwiched and joined to the upper alignment flange 3 of the side sill 2, and a lower edge that is sandwiched and joined to the lower alignment flange 4 of the side sill 2. Since it is formed over the entire effective length of the reinforcement 7A between the flange 9 and the forming base portion 9a, the rigidity of the joint portion can be further enhanced.
[0024]
In addition to this, since the reinforcing concave portions 12 and 13 are embossed on the drag surface 11, not only the surface rigidity of the reinforcement 7A can be increased, but also the concave bottom surfaces 12a of the concave portions 12 and 13 can be improved. , 13a are formed in parallel with the drag surface 11 to hold the drag surface 11, so that the rigidity of the coupling portion can be significantly increased.
[0025]
In addition, although the preferable example which formed the recessed part 12-15 for reinforcement in the reinforcement 7A was shown in the said embodiment, it cannot be overemphasized that the intended objective can be achieved even if these recessed parts are not provided.
[Brief description of the drawings]
FIG. 1 is a side view showing a reinforcement in an embodiment of the present invention.
2 (A), (B), (C), (D), (E), and (F) are lines AA, BB, CC, and DD in FIG. 1, respectively. Sectional drawing in each position of EE line and FF line.
FIG. 3 is a conceptual perspective view of a reinforcement in the embodiment.
FIG. 4 is a side view of a joint portion between a front pillar and a side sill that is an object of the present invention.
5 is a cross-sectional view taken along the line GG in FIG.
6 is a cross-sectional view taken along the line HH in FIG. 4;
FIG. 7 is a conceptual perspective view of a reinforcement in a conventional structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front pillar 2 Side sill 3 Upper alignment flange 4 Lower alignment flange 5 Front alignment flange 6 Close cross-section part 7A of a joint part Reinforce 8 Upper edge flange 9 Lower edge flange 10 Front edge flange 11 Drag surface 12, 13 Recessed surface 12a, 13a Concave bottom

Claims (3)

The lower alignment flange is offset outward or inward with respect to the upper alignment flange of the sill outer and the sill inner and the front alignment flange on the extension of the upper alignment flange, and the front side portion of the lower alignment flange is the front alignment flange The upper, lower and front edge flanges are connected to the upper, lower and lower side flanges of the side sill within the closed section of the joint where the side sill and the front pillar are connected smoothly. In a structure in which a reinforcement is provided that is sandwiched and joined to the flanges to divide the closed cross section of the joint portion into left and right, the front pillars of the reinforcement and the closed cross sections of the side sills cross each front pillar. Due to the bending moment in the longitudinal direction around the joint between the Coupling part structure of the front pillar and the side sill of the motor vehicle, characterized in that the formation of the drag surface to be linear with respect to the action line direction of the maximum shear stress acting in-force. 2. The structure for connecting a front pillar and a side sill of an automobile according to claim 1, wherein the drag surface is formed between the molding base portions of the upper edge flange and the lower edge flange of the reinforcement. The front pillar and the side sill of an automobile according to claim 1, wherein a concave portion for reinforcement is formed on the drag surface, and a concave bottom surface of the recess is formed in parallel with the drag surface. The joint structure.

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