JP4484437B2 - Reinforcing member for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing member structure that is attached to reinforce a body of a vehicle such as an automobile.
[0002]
[Prior art]
8 and 9 show an automobile door 21 on which a reinforcing member is disposed. The door 21 includes an outer panel 22 disposed on the outer side of the vehicle body and an inner panel 23 disposed on the inner side, and a space between the panels 22 and 23 extends from the front end side of the door 2 to the rear end in the front-rear direction of the vehicle body. A reinforcing member 24 is disposed over the side. 10 is a perspective view of the reinforcing member 24, and FIG. 11 is a cross-sectional view of the reinforcing member in the direction of line BB in FIG. The reinforcing member 24 is formed by integrally forming a flat plate by press molding, and attachment portions 25 to the panels 22 and 23 are formed at both ends in the longitudinal direction. As shown in FIG. 11, a beam portion 26 having a central portion formed in a U-shaped cross section is provided between the left and right mounting portions 25, and a flange portion extending outward from both end portions on the opening side of the U-shaped cross section. 27 is provided. Such a reinforcing member is provided in order to provide door crush resistance from the viewpoint of safety against a side collision of the vehicle.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-19559 (Summary, see FIG. 1)
[0004]
[Problems to be solved by the invention]
However, the reinforcing member having such a U-shaped cross section cannot play a sufficient role when the length from the reference surface of the flange portion 27 to the top becomes large and there is no space in the door. Although it is conceivable to increase the thickness of the reinforcing member, the weight of the product becomes heavy, which not only contradicts the demand for weight reduction of the vehicle body but also increases the material cost. Further, when the reinforcing member is integrally formed by pressing, if a high-tensile steel material is used as the material, the workability is deteriorated and the cost is increased. Furthermore, the mold structure of the press machine becomes complicated, and a large press machine is required. Moreover, although there exists a thing using a circular pipe as a reinforcement member, cost is high and a product weight will become heavy.
[0005]
The present invention has been made in view of such circumstances, and is a vehicle that is easy to form at low cost and can be formed by a small press machine even when a high-strength steel material having high rigidity is used for the beam portion. An object of the present invention is to provide a reinforcing member.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a vehicle reinforcing member that is installed between two parts along the outer surface of a vehicle body and reinforces a crushing resistance against an impact load that acts between the two parts from the outside of the vehicle body. , A beam (5) extending between the two parts, and a pair of mounting brackets (6, 7) which are welded to both ends (5d) of the beam and attach the beam to the two parts. The beam is made of a molding material having a uniform cross-sectional shape in the longitudinal direction formed by press-forming a high-tensile steel plate, and has a central top wall (5a) and a circular arc cross section on both sides of the central top wall. A pair of side wall portions (5b, 5b) that are continuous via the first bent portion (r), and a second bent portion (R) having an arcuate cross section on the opposite side of the central top wall portion of each side wall portion. A pair of flange portions (5c, 5c) extending in a direction that is continuous through and spaced apart from each other Has the the direction of the press-molding perpendicular to the central top wall portion, the central top wall portion (5a), and a uniform cross-section recessed circular shape (10a) in the longitudinal direction, and the first both sides the width direction each side portion from the bent portion leading to the flange portion via the sidewall portion and the second bent portion, mutually uniform in the longitudinal direction which is inclined inwardly of cross section S-shaped portion and a cross-sectional reverse S-shape As a portion, by flattening the concave arc shape (10a) of the central top wall portion by press molding in a direction orthogonal to the central top wall portion, the interval (L2) between the second bent portions is The pair of side wall portions is narrower than the distance (L1) between the first bent portions, and is formed to have reverse slopes that are close to each other as they go from the first bent portion to the second bent portion .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of an automobile adopting a reinforcing member structure according to the present invention.
The automobile 1 is provided with a front door 2 and a rear door 3, and a reinforcing member 4 disposed in a substantially horizontal direction is attached to each of the doors 2 and 3 from the front end side to the rear end side of the door. As shown in the sectional view of the front door 2 shown in FIG. 2, the reinforcing member is disposed in a closed sectional space formed by the outer panel 2 a and the inner panel 2 b of the door 2. The shape of the reinforcing member 4 disposed in each of the doors 2 and 3 is basically the same except that the shape of the door mounting portion is different. Therefore, the reinforcing member 4 shown in FIG. 3 and FIG. 4 disposed on one front door 2 will be described in detail.
[0008]
The reinforcing member 4 includes a beam 5 that is long in one direction, and mounting brackets 6 and 7 that are fixed to both ends of the beam 5 by welding. FIG. 5 shows a cross-sectional shape in a direction intersecting at right angles to the longitudinal direction of the beam 5. The beam 5 includes a flat top portion 5a and a pair of axisymmetric wall portions (body portions) 5b adjacent to each other through r portions that are curved inward from the both ends of the top portion 5a. And from both ends of these wall parts 5b, the flange part 5c extended in parallel with the surface of the top part 5a via the R part curved outside the beam 5 is provided. Therefore, the shape from the top portion 5a to the flange portion 5c is an S-shape. As shown in FIG. 5, the space | interval L1 by the side of the top part 5a of the wall part 5b is formed so that it may become larger than the space | interval L2 by the side of the flange part 5c of the wall part 5b. At both ends of the beam 5, flat mounting plates 5d extending further outward than the flange portion 5c are formed.
[0009]
The beam 5 is formed by press-forming a high-tensile steel material, and has a uniform cross-sectional shape in the longitudinal direction as shown in FIG. 5 except that the attachment plates 5d are formed at both ends. In the present embodiment, the curvatures r and R are formed to have substantially the same curvature, but the curvature may be different. Such a beam 5 can be formed by a press machine of 300 tons or less by a forming procedure as shown in FIGS.
[0010]
First, as shown in FIG. 6A, a flat plate 10 made of high-tensile steel is placed on a die 11 shown in FIG. 6B and pressed by a punch 12. A curvature R is formed in a flat plate (hereinafter, referred to as a molding material) 10 by R-shaped curved concave portions 11a on both ends of the bottom of the concave portion of the die 11 and corresponding R-shaped curved convex portions 12a on both sides of the tip of the punch 12. At the same time, the concave portion 11 b of the die 11 and the convex portion 12 b of the punch 12 form a downward recessed portion 10 a in the center of the molding material 10. Next, as shown in FIG. 6C, both sides of the recessed portion 10a of the molding material 10 formed in the previous step by the r-shaped curved convex portion 13a of the die 13 and the r-shaped curved concave portion 14a of the punch 14 corresponding thereto. To form a curvature r. During this pressing, the body portion 5b of the beam 5 is formed between r and R, and the flange portion 5c is formed with a slight inclination.
[0011]
As shown in FIG. 6D, in the final pressing step, the dent 10 a of the molding material 10 is pressed by the convex portion 15 a of the die 15 and the concave portion 16 a of the punch 16. The recess 16a of the punch 16 is bent so that the indentation 10a protrudes in the opposite direction. However, the protrusion 10a is flattened by the spring effect of the molding material 10 to form the top 10b (5a). In addition, since the whole molding material 10 shrinks by the spring effect, the molding material 10 can be easily extracted from the punch 16 at the time of pressing.
[0012]
The mounting brackets 6 and 7 of the reinforcing member 4 shown in FIG. 4 are both formed by pressing a flat plate. The mounting brackets 6 and 7 include a joint portion including flat plate portions 6 a and 7 a corresponding to the mounting plate 5 d of the beam 5 and having substantially the same cross-sectional shape as the beam 5, and a mounting portion corresponding to the mounting portion of the front door 2. However, if it is a high-tensile steel material, it is difficult to process, but by using a low-tensile steel material as the material of the mounting brackets 6 and 7, it becomes possible to form with a press machine of 300 tons or less. The flat plate portions 6a and 7a of the mounting brackets 6 and 7 and the mounting plate 5d of the beam 5 are joined by welding to produce the reinforcing member 4. As shown in FIG. 2, the reinforcing member 4 is welded or bolted with a mounting bracket 6 on the front end side of the front door 2 and a mounting bracket 7 on the rear end side, with the top 5 a of the beam 5 facing the outside of the vehicle body. By being fixed with, it is disposed inside the front door 2.
[0013]
FIG. 7 shows a result of measuring the deflection of the beam 5 when both ends of the reinforcing member 4 are fixed and a load is applied to the center position of the beam 5. A solid line a is the reinforcing member 4 in the present embodiment, a dotted line b is a U-shaped material, and both are made of the same material. The vertical axis represents the load (kN), and the horizontal axis represents the amount of deflection (mm) at the center of the beam 5. The reinforcing member 4 as the sample and the reinforcing member of the conventional example have the same height. As shown in the figure, it can be seen that the reinforcing member 4 of the present embodiment is less bent with respect to the load than the U-shaped member. Therefore, the deformation resistance against the side collision of the automobile is increased.
[0014]
Since the reinforcing member 4 has the top 5a of the beam 5 formed flat, it can absorb large deformation energy for its height, and can be applied to a thin door. Moreover, even if it is a thick door, there exists an advantage that the width | variety of a layout becomes wide by balance with other structural components. The reinforcing member 4 is made of a high-strength steel material for the beam 5 that requires strength, and the mounting brackets 6 and 7 that are difficult to process using a tensile steel material that has a lower strength. Thus, since the beam 5 and the mounting brackets 6 and 7 are formed separately, the reinforcing member 4 can be manufactured by using a small press machine for all the molding operations, thereby reducing the cost of the equipment and reducing the cost. Can be planned.
[0015]
The embodiment of the present invention has been described above. Of course, the present invention is not limited to this, and various modifications and changes can be made based on the technical idea of the present invention. For example, in the present embodiment, the reinforcing members 4 are disposed on the front and rear doors 2 and 3, but the present invention can also be applied to a front bumper, a rear bumper, and the like.
[0016]
【The invention's effect】
As described above, the present invention is a vehicle reinforcing member that is laid between two parts along the outer surface of the vehicle body and reinforces the crush resistance against an impact load that acts between the two parts from the outside of the vehicle body, A beam (5) extending between the two parts, and a pair of mounting brackets (6, 7) for being welded to both ends (5d) of the beam and attaching the beam to the two parts, The beam is formed of a molding material having a uniform cross-sectional shape in the longitudinal direction formed by press-forming a high-tensile steel plate, and has a central top wall portion (5a) and an arc-shaped cross section on both sides of the central top wall portion. A pair of side wall portions (5b, 5b) continuous via the first bent portion (r), and a second bent portion (R) having an arcuate cross section on the opposite side of the central top wall portion of each side wall portion. A pair of flange portions (5c, 5c) extending in a direction that is continuous and separated from each other. And, wherein the direction of the press-molding perpendicular to the central top wall portion, the central top wall portion (5a), and a uniform cross-section recessed circular shape (10a) in the longitudinal direction, and the first bent portion on both sides thereof Each side portion in the width direction from the side wall portion and the second bent portion to the flange portion is formed as a cross-section S-shaped portion and a cross-section inverted S-shape portion uniform in the longitudinal direction tilted inward from each other. From the above, by flattening the concave circular arc shape (10a) of the central top wall portion by press molding in a direction orthogonal to the central top wall portion, the interval (L2) between the second bent portions is the first Reinforcement because the pair of side wall portions are formed to have reverse slopes that are closer to each other as they go from the first bent portion to the second bent portion than the interval (L1) between the first bent portions. The bending rigidity of the member increases, and When heavy is loaded, it is possible to obtain a large deformation resistance. Moreover, when the top part is formed in a substantially flat shape and used as a reinforcing member for an automobile door, the height is reduced, and it can be easily attached to a narrow part of the door. Moreover, since the shape from the said center top wall part to a flange part is formed in the S shape at the said reinforcement member, a big crushing resistance can be obtained. Furthermore, although the reinforcing member is formed of a high-tensile steel material harder than the material of the mounting bracket, the entire reinforcing member can be produced with a small press machine (300 tons).
[Brief description of the drawings]
FIG. 1 is a perspective view of an automobile employing a reinforcing member structure according to an embodiment of the present invention for a door.
2 is a cross-sectional view of the front door in the direction of arrow CC in FIG.
FIG. 3 is a perspective view of a reinforcing member disposed on the front door of the automobile of FIG.
4 is an enlarged exploded perspective view of the reinforcing member of FIG. 3;
5 is an enlarged cross-sectional view of a reinforcing member in the direction of arrow DD in FIG.
6 is a diagram illustrating a beam forming procedure of the reinforcing member in FIG. 3, wherein A is a cross-sectional view showing a flat plate before forming, and B is a cross-sectional view showing forming by a first stage mold, C is a cross-sectional view showing the next stage forming of B, and D is a cross-sectional view showing the final stage forming.
FIG. 7 is a diagram of a load and a deflection test result of a reinforcing member of the present embodiment and a conventional reinforcing member.
FIG. 8 is a view of a door adopting a reinforcing member structure in a conventional example as viewed from the side of the automobile.
9 is a cross-sectional view of the front door in the direction of arrow AA in FIG.
10 is a perspective view of an integrally molded reinforcing member disposed on the door of FIG. 8. FIG.
11 is an enlarged cross-sectional view of a reinforcing member in the direction of arrow BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Car 2, 3 Door 4 Reinforcement member 5 Beam 5a Top part 5b Wall part 5c Flange part 5d Mounting plate 6,7 Mounting bracket 6a, 7a Flat plate part

Claims (1)

A vehicle reinforcing member that is laid between two parts along the outer surface of the vehicle body and reinforces a crushing resistance against an impact load that acts between the two parts from the outside of the vehicle body, the beam extending between the two parts; A pair of mounting brackets which are welded to both ends of the beam and for mounting the beam to the two parts,
Said beam is composed of a molding material having a uniform cross-sectional shape of high tensile strength steel in the longitudinal direction formed by press molding, and the central top wall portion, bending the first arcuate section on both sides of the central top wall portion A pair of side wall portions that are continuous via a portion, and a pair of side wall portions that extend in directions away from each other continuously via a second bent portion having a circular arc cross section on the opposite side of the central top wall portion of each side wall portion. The central top wall is formed into a concave arc shape that is uniform in the longitudinal direction by press molding in a direction orthogonal to the central top wall, and from the first bent portions on both sides thereof. said side wall portion and the second bent portion width direction each side portion extending to the flange portion via, after a uniform cross-section S-shaped portion and a cross-sectional inverted S-shaped portion in the longitudinal direction which is inclined inwardly with each other the cross-sectional recessed circular shape of the central top wall portion towards perpendicular to the central top wall portion By flattening by press molding, the interval between the second bent portions is narrower than the interval between the first bent portions, and the pair of side wall portions extends from the first bent portion to the second bent portion. A vehicle reinforcing member, wherein the vehicle reinforcing member is formed so as to have reverse slopes that approach each other as it goes.

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