JP3052382B2 - Impact beam for car door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact beam for an automobile door which is provided inside a door of an automobile and protects an occupant by preventing damage to the inside of the door in a side collision.

[0002]

2. Description of the Related Art Conventionally, when a load is applied to the side surface of an automobile from the outside in the vehicle width direction, an outer panel of the door may be deformed inward in the vehicle width direction. There is known an impact beam for an automobile door in which a reinforcing member made of a steel pipe capable of withstanding a unidirectional load is bridged along the horizontal direction of the door (Japanese Utility Model Application Laid-Open No. 52-11205).
No.).

As shown in FIG. 18, in the impact beam 80 for an automobile door, a beam material 82 having a pipe section which is lightweight and capable of absorbing a relatively large impact energy is used. I have.

However, as shown in FIG. 18, in the impact beam 80 for an automobile door, a light and high-strength beam member 82 having a pipe cross section and a bracket 84 for fixing the beam member 82 to the door are provided. ,
86 are connected to each other by welding portions 88 and 90, respectively. For this reason, in the impact beam 80 for an automobile door, there is a problem that the productivity is increased due to the welding operation, thereby increasing the cost, and the weight is increased by the welded portions 88 and 90.

As a means for remedying these problems, it is conceivable to use a recently developed high-strength steel sheet and press work a band made of the high-strength steel sheet to integrally mold the beam portion and the bracket portion. Unknown).

However, as shown in FIGS. 19A and 19B, in an impact beam 90 for an automobile door in which a beam portion and a bracket portion are integrally formed by pressing a band made of a high-tensile steel plate, A seam 92A is formed in the portion 92. Therefore, in order to increase the strength of the beam 92, the seam 92A is joined by welding or the like over the entire area. Therefore, the cost is increased due to a decrease in the productivity due to the welding operation, so that an improvement is required.

[0007]

SUMMARY OF THE INVENTION In view of the above facts, the present invention provides an impact beam for an automobile door which can reduce the welding area of a joint portion, improve productivity and reduce weight. That is the purpose.

[0008]

According to the present invention, there is provided an impact beam for an automobile door formed by pressing a band made of a high-tensile steel plate, wherein the flat plate-shaped bracket portions are formed at both ends. A tubular beam portion formed continuously and integrally between the bracket portions and having at least a central portion of the seam portion joined thereto; and a door provided on the bracket portion so that the seam portion is located outside in the vehicle width direction. And an attachment portion attached to the second member.

[0009]

According to the first aspect of the present invention, the impact beam for a vehicle door is attached to the door such that the joint portion is located outside in the vehicle width direction by the attaching portion. Therefore, when a load is applied to the impact beam for an automobile door from the outside in the vehicle width direction, the joint portion is on the compression deformation side, so that at least the central portion of the joint portion is connected to the beam portion by using a conventional pipe. The same strength as the impact beam for a vehicle door having the structure can be satisfied. Therefore, compared with the case where the entire area of the joint is joined by welding or the like, the weld area of the joint can be reduced, and the productivity can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an impact beam for an automobile door according to the present invention will be described below with reference to FIGS.

As shown in FIG. 2, a front side door 10 of an automobile has a front side door outer panel 12.
And a front side door inner panel 14 having a box-shaped cross section as in the prior art, and the front side door outer panel 12 and the front side door inner panel 1
The front edge, rear edge, and lower edge of the front panel 4 are firmly connected to the front side door outer panel 12 by folding the end of the front side door outer panel 12, respectively. As shown in FIG. 3, upper end edges 12A, 14A of the front side door outer panel 12 and the front side door inner panel 14 are bent in a substantially U-shape so as to face each other.
An opening 16 through which a front side window glass (not shown) enters and exits is provided between the front panel 2 and the front side door inner panel 14.

As shown in FIG. 4, shelves 14B and 14C extending in the front-rear direction are provided substantially vertically in front and rear portions of the front side door inner panel 14, respectively. The longitudinal ends of a front side door impact beam 20 as an automobile door impact beam are fixed to the portions 14B and 14C, respectively.

As shown in FIG. 1, the impact beam 20 for a front side door is formed by pressing a metal strip made of a single flat high-tensile steel plate, and has a circular cross section. It comprises a tubular beam portion 22 and flat bracket portions 24 and 26 formed at both longitudinal ends of the beam portion 22. The beam portion 22 has a seam portion 22A where edges of both ends of the flat plate abut,
The joints 22A are joined by general welding such as arc welding or plasma welding or plastic deformation such as pressure welding.

Further, the joint portion of the joint portion 22A is as follows.
In the case where the front side door impact beam 20 has a continuous pipe cross-sectional shape having a constant thickness, a function as a door impact beam is achieved by joining the central region S1 of the beam portion 22 which receives a load at the time of a side collision. Is fulfilling enough. Further, the beam portion 2 of the joint portion 22A
The bending strength of the beam portion 22 can be further improved by combining the regions S2 and S3 at both ends of the beam portion 22. In addition, as shown by the imaginary line in FIG. 1, by providing the gap 23 at a portion other than the joint portion, the accuracy of the engagement portion of the joint portion 22A can be improved.

Each of the brackets 24 and 26 has a fan shape with the beam portion 22 as a corner. The joints 22A of the front side door inner panel 14 are connected to the ends of the brackets 24 and 26, respectively. Shelf portions 14B and 14C facing the door outer panel 12 (see FIG. 4)
Mounting portions 24A and 26A are provided for fixing the mounting portions 24A and 26A. The ends of the brackets 24 and 26 have linear beads 2 which reach the beam portion 22 from the vicinity of the mounting portions 24A and 26A, respectively, and extend slightly into the beam portion 22.
8 are provided.

As shown in FIG. 3, a front side door impact beam 20 is
A is fixed so as to face the front side door outer panel 12 side (vehicle width direction outer side), and the continuous plate portion, that is, the non-seam portion is directed toward the front side door inner panel 14 side (vehicle width direction inner side). It is fixed. Therefore, when a load acts on the front side door impact beam 20 from the outside in the vehicle width direction, the joint portion 22A
Since the different structure portion caused by welding or plastic deformation of the pipe is on the compression deformation side, the same strength as that of a conventional impact beam for a door having a pipe structure is satisfied.

The bead 28 is protruded toward the inside of the front side door impact beam 20, that is, toward the front side door outer panel 12. Therefore, the bead 28 does not reduce the gap with the door glass.

Hereinafter, a manufacturing process of the impact beam 20 for a front side door according to this embodiment will be described.

In manufacturing the impact beam 20 for a front side door according to the present embodiment, as shown in FIG. 5, the metal band 30 is connected to the upper die 3 having a sectional shape shown in FIG.
2 and the lower mold 34 are pressed to form bent ends 30A and 30B at the widthwise ends of the metal band 30, and beads 28 are formed at both ends in the longitudinal direction. Next, as shown in FIG. 7, a portion to be the beam portion 22 of the metal band 30 is pressed by an upper die 36 and a lower die 38 shown in FIG. Further, as shown in FIG. 9, the part to be the beam portion 22 of the metal band 30 is connected to the upper die 40 and the lower die
2 to form a tubular beam portion 22.

Therefore, in the press working for forming the tubular beam portion 22, the bracket portions 24 and 26
In the case where an upward warp of 9 (B) (in the direction of the arrow A in FIG. 19B) is to be generated, beads 28 formed at both ends in the longitudinal direction of the band 30 in advance are warped. It acts as a beam and prevents the brackets 24, 26 from warping. For this reason, it is possible to obtain an impact beam for an automobile door made of a high-strength steel plate which is integrally molded and has extremely high dimensional accuracy without warpage of the bracket portions 24 and 26.

In this embodiment, the bead 28 is formed in a straight line extending in the longitudinal direction of the front side door impact beam 20, but instead of this, as shown in FIG. 11, the mounting portions 24A, 26A of the bead 46 are provided. The side (the 26A side is not shown) is divided into two branch portions 46A and 46B, and the strength of the bracket portions 24 and 26 is further increased to prevent the warp generated in the bracket portions 24 and 26. good. As shown in FIG. 12, the mounting portions 24A and 26A of the bead 48 (the 26A side is not shown) are divided into three branch portions 48A, 48B and 48C, and the strength of the bracket portions 24 and 26 is further increased. And the brackets 24 and 26
May be prevented from occurring.

The operation of this embodiment will be described below. According to the present embodiment, the front side door impact beam 20 is connected to the joint portion 22A by the attachment portions 24A and 26A.
Is attached to the front side door 10 so that the front side is located outside in the vehicle width direction. Therefore, when a load is applied to the front side door impact beam 20 from the outside in the vehicle width direction, the joint portion 22A is on the compression deformation side, so that at least the central portion of the joint portion 22A is connected to the beam portion 22. In this case, the same strength as that of a conventional impact beam for an automobile door having a pipe structure can be satisfied. Therefore, compared to a case where the entire region of the joint portion 22A is joined by welding or the like, the weld region of the joint portion can be reduced, and the productivity can be improved.

Next, a second embodiment of the impact beam for an automobile door according to the present invention will be described with reference to FIGS.

The same members as those in the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 13 and 14, a reinforcing pipe 50 which is thicker than the beam portion 22 is fixed to a substantially central portion in the longitudinal direction of the beam portion 22 of the front side door impact beam 20. And increase the strength of this part. Therefore, the thickness of the plate material constituting the front side door impact beam 20 can be made thinner as compared with the first embodiment, and the weight can be further reduced as compared with the first embodiment. Further, in order to sufficiently fulfill the function as the impact beam for the door, the joint 2
The portions actually connected to each other in 2A may be the ranges S4 and S5 of the portions corresponding to both ends 50A and 50B of the reinforcing pipe 50 and the ranges S2 and S3 of both ends of the beam portion 22. The range can be reduced, and productivity can be improved. As shown in FIG. 14, the outer diameter R2 of the reinforcing pipe 50 is larger than the inner diameter R1 of the beam portion 22.
Are made small and have backlash. Therefore, even when the inner diameter R1 of the beam portion 22 and the outer diameter R2 of the reinforcing pipe 50 vary, the seam portion 22A can be brought into close contact.

In this embodiment, the beam section 22
Instead of this, as shown in FIG. 15, instead of this, only the insertion part of the reinforcing pipe 50 is made the large diameter part 22D, and the vicinity of the bracket parts 24, 26 is made the small diameter part 22E, respectively.
As 22F, a structure in which the portion between the large diameter portion 22D and the small diameter portions 22E and 22F is gradually changed portions 22G and 22H may be used.
In this case, the displacement of the reinforcing pipe 50 can be prevented, and the weight can be reduced.

In this embodiment, the outer diameter R2 of the reinforcing pipe 50 is smaller than the inner diameter R1 of the beam portion 22, as shown in FIG.
As shown in the figure, the inner peripheral length of the beam portion 22 may be set to be shorter than the outer peripheral length of the reinforcing pipe 50, and the gap 52 may be intentionally provided at the joint portion 22A of the beam portion 22. 52, the joint portion 22A of the beam portion 22
When welding is performed by arc welding, the reinforcing pipe 50 can be simultaneously fixed in the beam portion 22, and the productivity can be improved.

In each of the above-described embodiments, the example in which the impact beam for a vehicle door of the present invention is applied to the impact beam 10 for a front side door has been described. As shown in FIG. The impact beam can be applied to the rear side door impact beam 54 by forming the brackets 54A and 54B in a shape corresponding to the mounting portion of the rear side door.

[0029]

As described above, the present invention has an excellent effect that the welding area at the seam can be reduced and the productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an impact beam for an automobile door according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a front side door to which the impact beam for an automobile door according to the first embodiment of the present invention is applied.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is a perspective view showing the shape of the impact beam for an automobile door after the end bending according to the first embodiment of the present invention.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a perspective view showing a shape after a U-bend of the impact beam for an automobile door according to the first embodiment of the present invention.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a perspective view showing the shape after impact bending of the impact beam for an automobile door according to the first embodiment of the present invention.

FIG. 10 is a sectional view taken along line 10-10 of FIG. 9;

FIG. 11 is a perspective view showing an end of an impact beam for a vehicle door according to another example of the present invention.

FIG. 12 is a perspective view showing an end of an impact beam for an automobile door according to another example of the present invention.

FIG. 13 is a perspective view showing an impact beam for an automobile door according to a second embodiment of the present invention.

FIG. 14 is a sectional view taken along line 14-14 of FIG.

FIG. 15 is a perspective view showing an impact beam for an automobile door according to another example of the present invention.

16 is a sectional view taken along line 16-16 of FIG.

FIG. 17 is a perspective view showing an impact beam for an automobile rear side door according to the present invention.

FIG. 18 is a perspective view showing a conventional impact beam for an automobile door.

FIG. 19A is a perspective view illustrating warpage when an impact beam for an automobile door is integrally formed, and FIG.
FIG. 3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Front side door 20 Impact beam for front side doors 22A Joint 22 Beam part 24 Bracket part 24A Mounting part 26 Bracket part 26A Mounting part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Yamaoka 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Kazuyuki Takano 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation ( 56) References JP-A-4-262918 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60J 5/00

Claims (1)

(57) [Claims] An impact beam for an automobile door formed by pressing a band made of a high-strength steel sheet, wherein the flat-plate-shaped bracket portions formed at both ends are continuously and integrally provided between these bracket portions. A tubular beam portion formed and connected at least to a center portion of the joint portion, and an attaching portion provided on the bracket portion and attached to a door so that the joint portion is located outside in the vehicle width direction. Impact beams for automotive doors.