JPH1058972A - Car door guard beam - Google Patents

Abstract

(57) [Summary] [Problem] A triangular vertex portion of a guide beam of an automobile door remains as an unpainted portion without being coated with a paint at the time of electrodeposition coating such as electrostatic coating. SOLUTION: A blank material of a high-tensile steel plate is bent so that two triangular mountain portions are arranged side by side so that a depression is formed between the triangular mountain portions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guard beam for an automobile door, and more particularly, to a guard beam provided in an interior space of an automobile door composed of an outer panel and an inner panel as a means for protecting an occupant in a collision. It relates to a guard beam for reinforcement.

[0002]

2. Description of the Related Art In recent years, in response to a demand for safety of an automobile, a reinforcing material called a guard beam is mounted in an interior space of an automobile door as a means for protecting an occupant in a collision. As such a guard beam,
Lightweight is required, and rigidity is required to protect the occupant against side impacts. Is required.

[0003] Such a conventional guard beam for an automobile has a tensile strength of 60 to 60 to have a sufficient tensile strength.
As shown in FIG. 8, a 100 kgf / mm ² high-strength steel plate was used and spot welding was combined to form a box-shaped cross section (see FIG. 4 of JP-A-4-208633). As shown in the figure, a tubular body formed by welding palm portions to both ends is known.

[0004] A guard beam 10 shown in FIG. 8 is formed in a box shape by welding and joining a contact plate 12 and a patch 4 plate 13 to both sides of a core material 11 which is pressed into three peaks and depressions by spot welding. is there. Therefore, the guard beam 10 constructed as described above is installed in the interior space of the automobile door so that the peaks and valleys of the core material 11 are kept substantially horizontal, so that the impact force at the time of collision can be absorbed as much as possible. ing.

A guard beam 20 shown in FIG. 9 has a base 21 having a tensile strength of 100 to 180 kgf / mm ^2.
22 is a palm portion (hereinafter referred to as an attachment plate) attached to both ends of the base 21 by welding or the like. Note that the guard beams 10 and 10 shown in FIG.
20 is an automobile door 30 as shown in FIG.
The beam end is welded to the panel 31 in such a manner as to bridge between the sleeves of the inner panel 31. 32 is an outer panel constituting the door 30.

[0006]

However, in the case of a guard beam 10 formed in a box shape as shown in FIG. 8, when the crush test is performed by applying a concentrated load to the center of the span, the maximum load is reached. At this point, the core material 11 buckles, and thereafter the load rapidly decreases, which is not sufficient in terms of the shock absorption characteristics.

In the case where the base 21 shown in FIG. 9 is used as a tube material, the cross-sectional shape of the base 21 is symmetrical with respect to the center. The moment of inertia I and the section modulus Z change sharply from the welded portion between the mounting plate 22 and the mounting plate 22, the mounting plate 22 is more easily deformed, and the vicinity of both ends of the base 21 absorbs an impact load. This means that materials that are relatively unrelated to are used. In addition, when quenching is performed, the guard beam 20 itself tends to be warped.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive automobile door guard beam which has no welds, is easy to form, and has excellent shock load absorbing characteristics. Is to provide.

[0009]

In order to achieve the above-mentioned object, the present invention relates to a support having a substantially triangular cross section and extending from a vertex portion of the outwardly directed triangle to a bottom plate portion. A plate portion, and a beam portion including a side plate portion that connects the apex side of the support plate portion to both edges of the bottom plate portion,
Palm portions for fixing and supporting the door portion at both ends of the beam portion, wherein the beam portion has a cross section formed by arranging two substantially triangular chevron portions side by side; And the palm portion is processed by one blank material of high-tensile steel.

According to the present invention, the impact force from the outside is transmitted through the apex of the beam portion. In the cross section of the beam portion, the support plate portion and the side plate portion mainly center on the apex portion. The impact force is shared, especially around the apex and the strut plate are formed so as to have a strong resistance to external impacts, and there is also resistance to buckling, and excellent impact The load absorbing characteristics can be maintained.

In addition, since the beam portion and the palm portion can be integrally formed by using a high-strength steel sheet blank material, the guard beam can be lightweight and inexpensive by appropriately selecting the thickness and dimensions. It is possible to create.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1A is a basic structural diagram that best illustrates the features of the present invention, and FIGS. 1B and 1C show paths through which an impact load is transmitted to the guard beam of the present invention. As shown in FIG. 1A, a guard beam 1 according to the present invention is provided.
Is obtained by simply forming a blank material cut out from a thin steel plate by punching or the like as described later. Guard beam 1 finished by molding
Has palm portions 2 having divergent shapes at both ends thereof, and a beam portion 3 between the palm portions 2 is bent so as to have a cross section as shown in (B) and (C).

That is, the cross section is formed in a substantially equilateral triangular shape, and the two plates are overlapped from the left and right from the apex side of the beam portion 3 facing the outside of the vehicle body to the center of the bottom plate portion. In this state, the support plate portion 4 is formed. In addition, the inclined portions on both sides of the apex portion continuously formed between the support plate portion 4 and the bottom plate portion 5 are hereinafter referred to as side plate portions 6.

In the guard beam 1 configured as described above,
When a vertical impact load P is applied to the bottom plate 5 from the outside of the door as shown in (B), the load P is applied by the beam 3 to the support plate 4 and the side plates 6, 6 as indicated by arrows. As a result, stress is not concentrated, and an effect of effectively absorbing an impact load without abrupt buckling as shown by a curve C1 in FIG. 4 can be obtained. FIG.
(C), even when an impact load P is applied obliquely from the outside, the left half of the beam portion 2 mainly carries the load P as shown in FIG. As a result of being supported by the plate portion 4, the cross section as a whole can maintain a second moment of area sufficient for absorbing an impact load.

Next, an example of a procedure for forming the guard beam 1 as shown in FIG. 1 will be described with reference to FIG.

First, as shown in FIG. 2A, a blank material in which the entire guard beam 1 is developed is positioned between the first male mold 7A and the first female mold 7B, and is positioned on the center line 10A.
Press working into 0-symmetrical U-shape 1A. Next, the work material 1A is pressed into a substantially W-type mold 1B by a second male mold 7C and a second female mold 7D as shown in FIG.
(C), (D) and (E) are subsequent bending steps. In the bending step (C), first, the bending angle of the curved portion 1AA obtained in the step (A) by the pressing die 7E. Is further pressed and bent so as to form an even more acute angle, and both ends to be the support plate portions 4 are pressed inward using the pressing die 7F in the bending step (D). The bending step (E) is a final bending step in which the flat ends 7G and the pressing dies 7H are further formed so that both end portions to become the support plate portions 4 are substantially opposed to each other.

The work material 1C thus obtained through the steps (A) to (E) is finished to the cross section of the beam portion 3 in the finished state by the pressing step (F). In FIG. It is a combination type for use. That is, by holding and processing the processing material 1C between the mating dies 7K and 7L, the beam portion 3 having the cross section as shown in FIGS. 1B and 1C can be formed and finished.

FIG. 3 shows another embodiment of the present invention. In the embodiments shown in FIGS. 3A and 3B, the end portions of the support plate portions 4A formed by bending the side plate portions 6 on both sides inward at the apexes are brought into contact with the bottom plate portion 5. Instead, the beam is kept in a triangular beam space. The length of the support plate portion 4A can be freely set. However, the shorter the length, the lower the maximum load that can withstand as shown by the curves C2 (dashed line) and C3 (two-dot chain line) in FIG. Then, the displacement point shifts to a direction in which the displacement amount increases. This means that the beam portion 3 easily bends in spite of the load, but can withstand the beam up to a point where the amount of deflection is large.

FIG. 5 shows an example of a guard beam finished product of an automobile door according to the present invention. That is, as a finished product, for example, as shown in this figure, the cross section of the beam portion 3 is formed as shown in (B), and the palm portions 2 on both sides are formed as shown in (C) and (D) during press working. Then, a convex reinforcing bead 9 is formed. Furthermore, it is desirable that a part of the side plate portion 6 is left in an extended form. By forming in this manner, it is possible to reinforce the palm portion 2 itself and prevent a sudden change in strength between the beam portion 3 and the palm portion 2.

When attaching the palm portions 2 on both sides to the inner panel 31 or the like of the door, the palm end portion 2A and the inner panel 31 are welded with a plurality of spot welds as in the prior art, or It is also possible to use a bolt hole 2B provided in the palm portion 2 to tighten the bolt to the inner panel 31, or to use both together.

The shape of the palm 2 and the shape and range of the reinforcing beads 9 provided on the palm 2 are not limited to the example shown in FIG. Furthermore, it goes without saying that the strength, thickness, dimensions, and the like of the blank material itself may be appropriately set so as to correspond to the assumed impact load.

Further, regarding the shaping of the beam part 3,
The steps shown in FIGS. 2A to 2F are not limited to the steps shown in FIGS. 2A to 2F. Any narrowing or pressing method may be used. In short, the uniform cross section shown in FIGS. It only has to be obtained in the length direction.

Further, as shown in FIG. 3 (C) or (D), in the support plate portion 4 or 4A, the lower ends of the formed portions are bent outward by 90 ° from each other. It is possible to further increase the maximum load by forming.

FIG. 6A is a perspective view showing an embodiment of the first invention of a guard beam for an automobile door according to the present invention.
(B) is a sectional view thereof. As shown in the figure, a guard beam 1 for an automobile door of the present invention is formed by bending a blank material cut out from a high-strength steel plate by punching or the like as shown in the figure, and has flared shapes at both ends. Are formed by bending so as to have a beam portion 3 having a cross-sectional shape shown in the figure between the palm portions 2. That is, as shown in FIG. 6B, the guard beam 1 is formed by bending using an appropriate mold so as to have a cross section in which two triangular chevron portions are arranged.

First, as shown in FIG.
A, a blank having a shape in which the entire guard beam 1 is developed is positioned between the first female molds 9B, and pressed into a U-shape 1A with the center line A symmetrical. Next, this processed material 1
A is the second male type 9C and the second female type 9D as shown in (B).
To form a substantially W-shaped 1B. (C),
(D) and (E) are subsequent bending steps in which the bending angle of the curved portion 1a obtained in the step (A) obtained by the pressing die 9E is further bent to an acute angle, and the bending step (D) is performed. Press type 9F
Then, both ends of the inner plate 7 are pushed inward. The bending step (E) is a final bending step in which the flat plate 9G and the pressing die 9H are used to make the both ends, which become the inner plate portion 7, substantially confront each other.

In this way, the processed material 1C obtained in the steps (A) to (E) is finished to the cross section of the beam portion 3 in the finished state by the pressing step (F).
By holding and processing the processing material 1C between the finishing dies of K and 9L, the beam portion 3 having a cross section as shown in FIG. 6B can be formed and finished.

In the guard beam 1 for an automobile door according to the present invention, the blank material of the high-strength steel plate has a cross section of two triangular chevron portions as shown in FIG. It is made by bending in the form of a so-called binaural peak, side by side, and the outer plate portion 5 extends from both sides of the bottom plate portion 4 inclining in the direction facing upward, and is bent inward in the middle, Two vertexes 6 are formed at intervals, and the vertices 6 are bent inwardly at the respective vertices 6 to extend the inner plate 7 so as to incline downward. The ends are joined together near the bottom plate 4 so that a V-shaped depression 8 is formed between the two triangular chevron portions.

The guard beam 1 thus constructed is attached to the inside of an outer panel of a door of an automobile, for example, by welding the bottom plate 4 of the guard beam 1 so that a vertex 6 faces inward. Since the depressions 8 are formed between the portions 6, when the interior of the door of the automobile is subjected to the electrodeposition coating, the depressions 8 of the guard beam 1 can be sufficiently coated. There is no inconvenience such as unpainted portions remaining, and therefore, the guard beam 1 is entirely well painted.

FIGS. 6C and 6D show another embodiment of the present invention. In FIG. 6C, an end portion of an inner plate portion 7 extending inwardly from a vertex portion 6 is shown. Are somewhat separated from each other, and somewhat away from the bottom plate portion 4, and extend parallel to each other at equal intervals from the apex portion 6 in FIG. Thus, FIG. 6 (B),
Preferably, a depression 8 is formed between two triangular chevrons as shown in (C) and (D),
When the electrodeposition coating is performed, the paint is sufficiently applied to the depressions 8 so that an unpainted portion does not occur, and a good electrodeposition coating can be performed.

[0031]

As described above, the cross-section has a substantially triangular shape, and the strut plate portion extending from the vertex of the triangle directed outward to the bottom plate portion; A beam portion including a side plate portion that connects the apex portion side to both edges of the bottom plate portion, and palm portions for fixing and supporting the door portion at both ends of the beam portion, respectively, wherein the beam portion is Since the cross section is formed by arranging two substantially triangular chevron portions side by side, and the beam portion and the palm portion are processed by one blank material of high-tensile steel,
It is possible to provide an inexpensive guard beam that is relatively lightweight, has sufficient impact load absorption capacity and stable strength.

Also, regardless of the welding process from the blank material,
Since it is possible to form mainly by press working, there is no danger of deformation such as warping due to welding heat or reduction in material strength.Furthermore, the selection of materials and their thickness and dimensions correspond to the assumed impact load. Can be set freely.

Also, since the beam portion is formed by bending so that two substantially triangular mountain portions having a cross section are located side by side and a depression is formed between these triangular mountain portions, In the case of electrodeposition coating such as electrostatic coating, there is no possibility that the paint is applied well to the depressions between the chevron portions and unpainted portions are formed, so that the coating can be suitably performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a basic configuration example of a guard beam according to the present invention by an overall perspective view (A) and cross sections (B) and (C) of a beam portion.

FIG. 2 shows a procedure for forming a guard beam according to the present invention (A).
It is explanatory drawing shown by a beam cross section according to each process of (F).

FIG. 3 is a cross-sectional view showing the configuration of a beam unit according to another embodiment of the present invention in four forms (A), (B), (C), and (D).

FIG. 4 is a characteristic curve diagram showing a load-displacement relationship according to the present invention.

5 is an overall perspective view of the finished product according to the present invention, FIG. 5A is a cross-sectional view taken along line XX of FIG. 5A, FIG.
(D) YZ cross-sectional view (C) and ZZ cross-sectional view of (A)
FIG.

6 (A) is a perspective view, FIG. 6 (B) is a cross-sectional view taken along line XX of FIG. 6 (A), and FIGS. D) is a sectional view of another embodiment.

FIG. 7 shows the molding procedure of the automobile door of the present invention by (A) to (A).
It is sectional drawing shown by the beam cross section according to the process of (F).

FIG. 8 is a perspective view showing a configuration of a main part according to a conventional example.

FIG. 9 is a perspective view showing a configuration according to another conventional example.

FIG. 10 is a cross-sectional view showing a state where a guard beam is mounted in a door according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 guard beam 1A, 1B (press) processed material 1AA curved part 2 palm part 2A palm end part 3 beam part 4, 4A support plate part 5 bottom plate part 6 side plate part 7A first male mold 7B first female mold 7C second Male 7D Second female 7E Push 7F Push 7G Flat 7H Push 7K Combination 7L Combination 9 Reinforcement bead

Claims (5)

[Claims] 1. A support plate having a substantially triangular cross section and extending from a vertex of an outwardly directed triangle to a bottom plate, and a bottom plate portion extending from the vertex side of the support plate to a bottom plate. A beam portion comprising side plate portions connected to both edges of the beam portion; and palm portions at both ends of the beam portion for fixedly supporting the door side, respectively. The beam portion has a cross section of two substantially triangular shapes. A guard beam for a door for an automobile, wherein the beam portion and the palm portion are processed by a single blank material made of high-strength steel. 2. The guard beam for an automobile door according to claim 1, wherein an end of the support plate portion on the bottom plate portion side is in contact with the bottom plate portion. 3. The triangular chevron portion includes a bottom plate portion and outer plate portions extending outward and inward from both ends of the bottom plate portion. 2. The guard beam for an automobile door according to claim 1, wherein the guard beam is formed by bending so that a depression is formed between the triangular mountain portions. 4. The guard beam for an automobile door according to claim 1, wherein the inner plate portion extends in a direction converging downward and inward. 5. The guard beam for an automobile door according to claim 1, wherein the inner plate portions extend in parallel at equal downward intervals.