JP6712218B2 - Car door beam - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door beam arranged inside a door of an automobile, and more particularly to a door beam provided with a function of improving tension rigidity and dent resistance of an outer panel of the door.

A door beam made of an aluminum alloy extruded material generally comprises an outer flange and an inner flange, and a pair of webs connecting the both flanges, and is arranged inside the door between the outer panel and the inner panel. There is a gap between the outer flange of the door beam and the outer panel of the door, and in order to improve the tension rigidity and dent resistance of the outer panel, adhesive (mastic sealant) is applied to the gap at a plurality of positions along the longitudinal direction of the door beam. It is filled (see Patent Documents 1 and 2).
In order to secure the tension rigidity and the dent resistance of the outer panel of the door, it is preferable that the gap is small, and the size of the gap and the amount of the adhesive are substantially constant along the longitudinal direction of the door beam.

On the other hand, some doors of automobiles have a design in which an outer panel as an outer appearance is gently curved in the front-rear direction and the vertical direction. When a straight door beam without bending is applied to a door having an outer panel having such a design, the size of the gap between the outer panel and the outer flange of the door beam changes along the longitudinal direction of the door beam. When the size of the gap changes, the amount of the adhesive filled in the gap varies, resulting in a problem that the outer panel is distorted. This distortion is due to the adhesive expanding and then contracting during the heating-cooling process of the heat treatment.

In paragraph 0002 of Patent Document 2, when the outer panel has a curved design, the door beam is bent with a small curvature according to the design of the outer panel, so that the size of the gap is substantially constant along the longitudinal direction of the door beam. It is described that However, aluminum alloy extruded materials have a relatively large springback during bending due to the low elastic modulus of the material, and especially when performing bending with a small curvature that changes along the longitudinal direction, shape accuracy is improved. Is difficult to obtain.

Patent Document 3 relates to a roof reinforcement for a vehicle body made of an aluminum alloy extruded material, and presses the upper flange at a plurality of locations along the longitudinal direction to displace the height of the upper flange, and the upper side after displacement. It is described that the gap between the rule panel and the roof panel is substantially constant. Here, as shown in FIG. 6A, the material (aluminum alloy extruded material) is composed of an upper flange 1 and a lower flange 2, and a pair of webs 3 and 4 connecting both flanges, and the upper flange 1 has a closed cross section. It has projecting flanges 6 and 6 projecting on both sides of the part 5. As shown in FIG. 6B, the projecting flanges 6 and 6 are pressed against this material, and the projecting flanges 6 and 6 are deformed into a substantially L-shaped cross-section composed of the vertical wall 6a and the longitudinal wall 6b. By changing the height (displacement amount) h of the vertical direction wall 6a from the closed cross-section portion 5 at a plurality of points subjected to press working, the protruding flanges 6 and 6 after press molding and a curved roof panel (not shown) are formed. Can be made substantially constant along the longitudinal direction.

JP, 2007-302104, A JP, 2005-147490, A JP, 2009-35244, A

If the means described in Patent Document 3 is applied to the door beam, the gap between the outer panel of the door and the outer flange (protruding flange) of the door beam can be reduced. Even when the outer panel of the door is curved in the front-rear direction and the up-down direction, by changing the height (displacement amount) h of the up-down wall depending on the position of the door beam in the longitudinal direction, the size of the gap and the adhesive Can be substantially constant along the length of the door beam.
However, in the means described in Patent Document 3, the protruding flanges 6 and 6 are pressed upward from the connecting portion with the closed cross-section portion 5, so that the central portion of the outer flange 1 is formed as shown by the broken line in FIG. 6B. (Part that constitutes the closed cross section 5) 7 is curved downward, and the webs 3 and 4 are curved outward. For this reason, the door beam after pressing has an initial irregularity, the cross section is easily crushed at the time of collision, and the energy absorption amount of the door beam may be reduced.

The present invention has been made in view of the above problems of the prior art, and in a plurality of locations along the longitudinal direction of the door beam, an adhesive is filled in a gap between the outer flange of the door beam and the outer panel of the door. An object of the present invention is to provide a door beam which can prevent the outer panel from being distorted and which does not have the initial irregularity when improving the tension rigidity and dent resistance of the outer panel.

A door beam according to the present invention is arranged between an outer panel and an inner panel of an automobile door, is made of an aluminum alloy extruded material , and is arranged on an outer flange arranged on the outside in the width direction of the automobile and an inside flange in the width direction of the automobile. There is a pair of webs that connect the inner flange and both flanges, the width direction central portion of both the flanges and the two webs form a rectangular closed cross section, and the outer flange and the inner flange have the closed cross section. In a door beam having projecting flanges projecting on both sides, wherein the outer flange facing the outer panel is provided with an adhesive application portion, the projecting flanges of the outer flange are pressed at a plurality of positions along the longitudinal direction of the door beam. A pressed portion, the pressed portion is located at a predetermined distance from the closed cross-section portion, and the protruding flange of the pressed portion is located outward of the original position of the aluminum alloy extruded material, which is a raw material, in the width direction of the vehicle body. It is displaced (projected), and the coating part is provided on the projecting flange of the pressed part. The original position has the same meaning as the position before press working.

The door beam according to the present invention has the following specific forms, for example.
In a cross section that is perpendicular to the longitudinal direction of the door beam and passes through the pressed portion, the protruding flange of the outer flange has a flat first wall and a first wall that follow the portion that constitutes the closed cross section of the outer flange. The second wall and the third wall are connected to each other. The second wall and the third wall are included in the press working portion, the second wall protrudes outward in the vehicle body width direction, and the third wall is provided . The application part is provided on the wall. In this case, preferably, the second wall is located outside in the width direction of the inner flange in a cross section which is perpendicular to the longitudinal direction of the door beam and passes through the pressed portion.

The door beam according to the present invention reduces the gap between the protruding flange and the outer panel of the door by displacing (projecting) the protruding flange of the outer flange from the original position to the outer side in the vehicle width direction in the press working part. be able to. Since the magnitude of the displacement (height of the third wall) can be appropriately adjusted for each press working portion, the gap between the protruding flange and the outer panel of the door should be substantially constant along the longitudinal direction of the door beam. You can As a result, when the gap between the outer flange of the door beam (the coating portion of the third wall) and the outer panel of the door is filled with the adhesive, the rigidity and dent resistance of the outer panel are improved, and the outer panel is distorted. Can be prevented.

Further, in the door beam according to the present invention, since the press working portion is formed at a position separated from the closed cross section by a predetermined distance, the initial irregularity described with reference to FIG. 6 is not introduced into the door beam by the press working. I'm done. As a result, it is possible to prevent the cross section of the door beam from being easily collapsed at the time of a side collision or the energy absorption amount at the time of collision being reduced due to the influence of the initial irregularity.

FIG. 1 is a plan view (FIG. 1A) of a door beam (arranged in a door) according to the present invention and a side view (FIG. 1B) of the door beam. It is sectional drawing (FIG. 2A) of the aluminum alloy extruded material which is a raw material of the door beam shown in FIG. 1, BB sectional drawing (FIG. 2B) of FIG. 1B, and CC sectional drawing (FIG. 2C). 3A and 3B are a cross-sectional view before pressing (FIG. 3A) and a cross-sectional view after pressing (FIG. 3B) showing a method for pressing the door beam shown in FIG. 1. It is a perspective view of another door beam concerning the present invention. It is the top view (FIG. 1A) of another door beam (arranged in a door) which concerns on this invention, and the side view (FIG. 1B) of the door beam. It is sectional drawing (FIG. 6A) of the roof reinforcement before press processing described in patent document 3, and sectional drawing (FIG. 6B) of the roof reinforcement after press processing.

Hereinafter, the door beam according to the present invention will be specifically described with reference to FIGS.
FIG. 1 shows an example of a door beam according to the present invention.
The door beam 11 is made of a straight aluminum alloy extruded material without bending. As shown in FIG. 2A, the cross-sectional shape of the same material is composed of a flat outer flange 12, an inner flange 13, and a pair of webs 14 and 15 connecting both flanges. The central portions 16 and 17 of the outer flange 12 and the inner flange 13 and the webs 14 and 15 form a closed cross-section portion 18. The outer flange 12 and the inner flange 13 are parallel to each other, and the webs 14 and 15 are parallel to each other and perpendicular to both flanges 12 and 13. The outer flange 12 and the inner flange 13 each include a projecting flange 19, 19, 20, 20 projecting to the outside of the closed cross section 18, and when viewed in a cross section perpendicular to the longitudinal direction, the projecting flange 19 is larger than the projecting flange 20. It projects to the left and right for a long time.

Except for a plurality of locations (eight locations in this example) along the longitudinal direction, the material is cut off with the protruding flanges 19 and 19 leaving a partial region close to the closed cross-section portion 18, and then the locations (hereinafter, The door beam 11 is formed by being subjected to press working in a press working section). Such partial cutting of the protruding flanges 19 and 19 is performed as necessary in order to reduce the weight of the door beam 11.
As shown in FIG. 1A, the door beam 11 is arranged between an outer panel 21 and an inner panel 22 of a vehicle door. In this example, both ends of the door beam 11 are attached to the inner panel 22 via brackets 23 and 24.

In the door beam 11, the pressed portion is formed in a region separated from the closed cross-section portion 18 by a predetermined distance (distance d shown in FIG. 2C) outside the protruding flange 19 in the width direction, and the region is in the width direction of the protruding flange 19. Reach the outer edge. In the pressed portion, the protruding flange 19 is displaced (projected) outward from the original position in the vehicle width direction. More specifically, in a cross section perpendicular to the longitudinal direction of the door beam 11 and passing through the center of the pressed portion, the projecting flange 19 is flat following the central portion 16 (the portion forming the closed cross-section portion 18) of the outer flange 12. The first wall 19a, the second wall 19b following the first wall 19a, and the third wall 19c following the second wall 19b. Of these, the second wall 19b and the third wall 19c are included in the press working portion, the second wall 19b projects outward in the vehicle width direction , and the third wall is substantially parallel to the central portion 16 and faces in the vehicle front-rear direction. Both of them are displaced (projected) outward from the original position (the position of the first wall 19a) in the vehicle width direction. As shown in FIG. 1A, the third wall 19c faces the outer panel 21, and an application portion of the adhesive 25 is provided there.

In pressing the protruding flanges 19 and 19, as shown in FIG. 3A, first, the material (the material after the protruding flanges 19 and 19 are partially cut off) is placed on the lower mold 26. Subsequently, as shown in FIG. 3B, the lower mold 26 is moved toward the upper mold 27 (from the inner side to the outer side in the vehicle width direction), and the protruding flanges 19 and 19 are pressed by the upper and lower molds 26 and 27. To do. By this press working, a part of the original flat protruding flanges 19, 19 is displaced outward in the vehicle width direction to form the press working portion (the second wall 19b and the third wall 19c). The first wall 19a that separates from the original wall keeps its original position.
In the example shown in FIG. 3, the second wall 19b is located on the outer side in the width direction of the inner flange 12 (protruding flange 20). More specifically, there is a predetermined gap c (c>0) between the outer end of the second wall 19b and the end face of the inner flange 12. As a result, when the lower die 26 moves up and down, the material does not hinder or the material can be placed on the lower die 26 without hindrance.

In each press working portion, the magnitude of the displacement of the third wall 19c, that is, the height h (see FIGS. 1A and 2C) is determined by the gap between the closed cross-section portion 18 of the straight door beam 11 without bending and the outer panel 21. Is changed along the longitudinal direction of the door beam 11. As a result, in this door beam 11, the size of the gap between the third wall 19c where the adhesive 25 is applied and the outer panel 21 is smaller and more uniform than the gap when it is assumed that no press working is performed. And is almost constant along the longitudinal direction.

FIG. 4 shows another example of the door beam according to the present invention. In FIG. 4, basically the same parts as the door beam 11 and the door structure shown in FIG. 1 are given the same numbers.
In the door beam 31 shown in FIG. 4, the arrangement of the press working portions (the second wall 19b, the third wall 19c) is staggered with the closed cross-section portion 18 sandwiched therebetween, and the arrangement of the press working portions is the closed cross-section portion 18 The door beam 11 is different from the door beam 11 which is symmetric with respect to. Door beam 31 is otherwise substantially the same as door beam 11.

FIG. 5 shows another example of the door beam according to the present invention. In FIG. 5, basically the same parts as those of the door beam 11 shown in FIG. 1 are given the same numbers.
The door beam 41 shown in FIG. 5 differs from the door beam 11 in that the protruding flange 19 is not cut off at all. Due to this difference, the pressed portion of the door beam 41 has a substantially hollow truncated pyramid shape without a side wall on the widthwise end side of the protruding flange 19. However, in the cross section which is perpendicular to the longitudinal direction of the door beam 41 and passes through the center of the pressed portion, the protruding flange 19 is the same as the door beam 11 in that it is composed of the first wall 19a, the second wall 19b and the third wall 19c. is there.

11, 31, 41 Door beam 12 Outer flange 13 Inner flange 14, 15 Web 16 Outer flange central part 17 Inner flange central part 18 Closed cross-section part 19 Outer flange protruding flange 19a No. between closed cross-section part and stamping part 1 wall (part of the protruding flange of the outer flange)
19b Second wall of pressed part (part of protruding flange of outer flange)
19c Third wall of pressed part (part of protruding flange of outer flange)
20 Inner Flange Projecting Flange 21 Door Outer Panel 22 Door Inner Panel 25 Adhesives 26, 27 Press Mold

Claims (3)

An outer flange that is placed between the outer panel and the inner panel of a vehicle door and is made of aluminum alloy extruded material , and is located on the outer side in the vehicle width direction of the vehicle and the inner flange and both flanges that are placed on the inner side in the vehicle width direction of the vehicle. A pair of webs connecting the two flanges, a central portion in the width direction of the both flanges and the two webs form a rectangular closed cross section, and the outer flange and the inner flange have projecting flanges projecting on both sides of the closed cross section. Having a door beam in which an adhesive application portion is provided on the outer flange facing the outer panel, a protruding flange of the outer flange has press working portions at a plurality of positions along the longitudinal direction of the door beam, The press working part is located at a position separated from the closed cross-section part by a predetermined distance, and the protruding flange of the press working part is displaced outward from the original position of the aluminum alloy extruded material, which is the raw material, in the width direction of the vehicle body. A door beam of an automobile, wherein the coating portion is provided on a protruding flange of the processing portion. In a cross section that is perpendicular to the longitudinal direction of the door beam and passes through the pressed portion, the protruding flange of the outer flange has a flat first wall and a first wall that follow the portion that constitutes the closed cross section of the outer flange. The second wall and the third wall are connected to each other. The second wall and the third wall are included in the press working portion, the second wall protrudes outward in the vehicle body width direction, and the third wall is provided . The vehicle door beam according to claim 1, wherein the coating portion is provided on a wall. The door beam for an automobile according to claim 2, wherein the second wall is located outside in the width direction of the inner flange in a cross section that is perpendicular to the longitudinal direction of the door beam and passes through the pressed portion.

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