JP2008068822A - Mounting structure for door beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a door beam capable of sufficiently absorbing impact by a door beam without increasing a cross section area of the door beam and deforming a bracket when collision load is applied to it in side impact in automobile accident. <P>SOLUTION: The bracket 2 for mounting the door beam 1 to an inner panel 3 of a door panel 5 is constituted by a door beam joint piece 2a joined to an end of the door beam 1; an inner panel joint piece 2b joined to a bent piece 3a of the inner panel 3; and a reinforcement piece 2c continuously contacted with both pieces so as to be approximately perpendicular to the door beam joint piece 2a and the inner panel joint piece 2b. The inner panel joint piece 2b is directed to an inner side in a vehicle body width direction along the bent piece 3a of the inner panel 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a door beam mounting structure provided inside an automobile door in order to absorb an impact and protect an occupant at the time of a side collision in an automobile accident.

  In recent years, the panel structure that forms the side of an automobile is less bent even when subjected to a load caused by a side collision to reduce the amount of deformation to the vehicle interior side in order to improve safety during a collision from the side. Such a structure is required.

  Of the panel structure constituting the side of this automobile, the door panel is constructed by joining the end portions of an inner panel and an outer panel formed by press-molding a rolled plate material such as a steel plate or an aluminum plate to form a space therein. Has been. In the interior space, a long bar-shaped reinforcing member called a door beam is often provided in order to take a collision load in a side collision and prevent bending deformation of the door panel toward the interior of the vehicle as much as possible.

The door beam is disposed substantially horizontally in the front-rear direction of the vehicle body, and is attached with its end joined to the inner panel. In general, a bracket is joined to the end portion of the door beam and often joined to the inner panel via the bracket, and the configuration is also disclosed in, for example, Patent Documents 1, 2, 3, and the like. .
JP 2001-277852 A JP-A-9-122745 JP 9-175180 A

In recent years, it has become necessary to further strengthen the side collision standards, and this door beam itself is required to have higher bending strength than before, and it is also required to have higher rigidity in order to reduce the amount of entry into the vehicle interior. It has come to be. In order to increase the bending strength and bending rigidity of the door beam, there are generally the following means.
(1) Improvement of bending strength by increasing the strength of the material (2) Improvement of bending strength and bending rigidity by increasing the outer dimensions of the cross section (3) Improvement of bending strength and bending rigidity by increasing the thickness of each part constituting the cross section

  Among these, regarding the strengthening of materials, the application of high-strength high tensile steel is already applied in the case of steel sheets, and the application of JIS 7000 series aluminum alloy materials in the case of aluminum materials. Is getting into a difficult situation. Further, the increase in the outer cross-sectional dimension and the wall thickness is not always preferable because the cross-sectional area increases and the weight increases.

  On the other hand, Patent Document 3 describes that a cross-sectional structure closed in plan view is formed between a bracket and a door front end surface in order to ensure strength and rigidity against a collision from a side surface. However, this method has various problems such as only the attachment part on the front side of the vehicle body, the number of parts of the bracket is large, and the material is practically limited to the steel plate because it requires complicated pressing. there were.

  FIG. 12A shows a door beam mounting structure in a general conventional automobile door. In this prior art, the door beam joining piece 2a of the L-shaped bracket 2 composed of the door beam joining piece 2a and the inner panel joining piece 2b is joined to both ends of the door beam 1 by bolt joining or the like. (Refer to FIG. 1) is disposed in the space inside the door panel 5 (refer to FIG. 1) formed, and the inner panel joining piece 2b of the bracket 2 is disposed toward the inner side in the vehicle body width direction. The door beam 1 was attached to the bent pieces 3a by joining them with bolts or the like. When a collision load due to a side collision is applied to the door beam 1 as described above, the bracket 2 is deformed as shown in FIG. 12B and FIG. There was a problem that it did not function sufficiently as a collision member.

  Further, although the door beam 1 described in Patent Document 1 is attached to the inner panel 3 side, the door beam 1 is attached to the outer panel 4 side as much as possible to ensure the strength and rigidity against the collision from the side surface. There is a need. When the technique described in Patent Document 1 is adopted and it is considered to secure the strength and rigidity against the collision from the side, the configuration is as shown in FIG. In such a configuration, the inner panel joining piece 2b is shortened, and a sufficient joining area with the inner panel 3 cannot be obtained. That is, only one bolt can be used in the case of bolt joining, and in the case of welding or bonding, the joining strength is not always sufficient, and local deformation tends to occur at the joined part, making it difficult to ensure rigidity. There is a problem.

  The present invention has been invented as a solution to the above-mentioned various conventional problems, and the bracket is not deformed when a collision load is applied during a side collision in an automobile accident without increasing the sectional area of the door beam. It is an object of the present invention to provide a door beam mounting structure that can sufficiently absorb an impact by the door beam.

  The invention according to claim 1 is configured by joining the bent pieces of the inner panel in which bent pieces are formed at both ends in the front-rear direction of the vehicle body and the end portions of the outer panel, and a space is formed therein. In the door beam mounting structure comprising a door panel of an automobile, a long door beam installed in a space inside the door panel, and a bracket for attaching an end of the door beam to the bent piece of the inner panel, the bracket includes: A door beam joining piece joined to an end of the door beam, an inner panel joining piece joined to the bent piece of the inner panel, and a reinforcing piece connected to both the door beam joining piece and the inner panel joining piece so as to be substantially orthogonal to each other The inner panel joining piece is directed inward in the vehicle body width direction along the bent piece of the inner panel. A mounting structure of a door beam according to claim Rukoto.

  The invention according to claim 2 is the door beam mounting structure according to claim 1, wherein the reinforcing piece connects the door beam joining piece and one side edge of the inner panel joining piece.

  The invention according to claim 3 is the door beam mounting structure according to claim 1, wherein there are two reinforcing pieces, and both side edges of the door beam joining piece and the inner panel joining piece are connected to each other.

  According to a fourth aspect of the present invention, there is provided the door beam mounting structure according to any one of the first to third aspects, wherein the reinforcing piece is joined to a bent piece on the lower surface of the inner panel.

  The invention according to claim 5 is the door beam mounting structure according to any one of claims 1 to 4, wherein the door beam is arranged close to the outer panel side in the space inside the door panel. .

  According to the door beam mounting structure of the present invention, when a collision load is applied during a side collision in an automobile accident, the bracket is not deformed as much as possible, and the impact can be sufficiently absorbed by the door beam.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

  As shown in FIGS. 1 and 2, the door panel 5 of the automobile is configured by joining ends of a pair of inner panel 3 and outer panel 4 to each other. The inner panel 3 is a substantially rectangular metal panel in which a bent piece 3a that is bent toward the outer panel 4 to be joined is formed at least in the front-rear direction end portion of the vehicle body or on the entire periphery. The outer panel 4 is a metal panel having substantially the same shape as the inner panel 3 when viewed from the front. In a state where the inner panel 3 and the outer panel 4 are joined, a space having a thickness corresponding to the length of the bent piece 3a (the width direction of the vehicle body) is formed between the inner panel 3 and the outer panel 4. In this space, a long door beam 1 is attached via a bracket 2.

  The door beam 1 is formed of an extruded shape such as a JIS 6000 series aluminum alloy material, a JIS 7000 series aluminum alloy material, or a steel material, but it is desirable to employ an aluminum alloy material from the viewpoint of weight reduction. The door beam 1 includes a pair of parallel flanges 1a and 1a and a pair of webs 1b and 1b connecting the flanges 1a and 1a. The door beam 1 extends in the space inside the door panel 5 along the longitudinal direction of the vehicle body. It is installed almost horizontally. Further, both end portions of the door beam 1 are shaped so as to be cut obliquely, and the flange 1a on the inner side in the vehicle body width direction is longer than the other flange 1a, and the following bolt joining can be easily performed.

  The bracket 2 has a shape as shown in FIGS. 2 and 3, and is a door beam joint that is joined to the end of the door beam 1 along the vehicle width direction inner side surface of the flange 1 a in the vehicle width direction by bolting. A piece 2a, an inner panel joining piece 2b joined to the inner side of the bent piece 3a of the inner panel 3 by bolting, and one side edge side of the door beam joining piece 2a and the inner panel joining piece 2b connected in an L-shape. It is comprised from the triangular reinforcement piece 2c. The door beam joining piece 2a is provided with one bolt hole, and the inner panel joining piece 2b is provided with two bolt holes. The inner panel joining piece 2b is formed on the bent piece 3a of the inner panel 3. It is arrange | positioned in the state which goes to a vehicle body width direction inner side along, and is bolted.

  As shown in FIG. 1, two bolt holes of the inner panel joining piece 2b are arranged in the width direction of the vehicle body, and by joining with two bolts, sufficient strength and rigidity against impact load due to side collision are secured. can do. The door beam 1 is attached to the outer panel 4 side in the space inside the door panel 5. This is for more efficiently ensuring the strength and rigidity against the collision from the side. Thus, since the door beam 1 is attached to the outer panel 4 side, the inner panel joining piece 2b can be lengthened in the width direction of the vehicle body, and two or more bolt holes can be provided. In addition, when joining by welding etc., there exists an effect that a joining area can be taken widely.

  The bracket 2 is made of an extruded shape such as a JIS 5000 series aluminum alloy material, a JIS 6000 series aluminum alloy material, or a steel material, and has a thickness of 0.4 to 5 mm depending on the door strength. . As with the door beam 1, the bracket 2 is preferably made of an aluminum alloy material from the viewpoint of weight reduction.

  FIG. 4 shows a state of rotational deformation of the door beam 1 when a collision load due to a side collision is applied. When a collision load indicated by an arrow is applied, the bracket 2 tries to bend, but the bracket 2 is not easily bent because the reinforcing piece 2c is provided. Rotational deformation of is difficult to occur. That is, the bending strength and bending rigidity of the door beam 1 in a side collision are improved. In addition, although the same effect is produced also in each following embodiment, since it is the same as this description, an effect is not demonstrated using drawing for every embodiment.

  FIG. 5 shows a bracket 2 according to a different embodiment of the invention. The bracket 2 includes a door beam joining piece 2a that is joined to an end of the door beam 1 by bolting along the inner side surface of the flange 1a in the vehicle width direction of the door beam 1 and a bent piece 3a of the inner panel 3. An inner panel joining piece 2b joined to the inside by bolting, a door beam joining piece 2a joined in an L shape, and a pair of triangular reinforcing pieces 2c, 2c joining both side edges of the inner panel joining piece 2b. . That is, the feature is that two reinforcing pieces 2c are provided. Other configurations are the same as those of the embodiment shown in FIGS. According to the embodiment shown in FIG. 5, the strength and rigidity of the reinforcing piece 2c can be ensured more sufficiently.

  FIG. 6 shows a bracket 2 according to still another embodiment of the present invention. The bracket 2 includes a door beam joining piece 2a that is joined to an end of the door beam 1 by bolting along the inner side surface of the flange 1a in the vehicle width direction of the door beam 1 and a bent piece 3a of the inner panel 3. The inner panel joining piece 2b is joined to the inside by bolting, the door beam joining piece 2a connected in an L shape, and the triangular reinforcing piece 2c connecting one side edge side of the inner panel joining piece 2b. The door beam joining piece 2a is provided with two reinforcing ribs 2d and 2d, and has an effect of reinforcing the door beam joining piece 2a and the bracket 2 as a whole. Further, if the spacing between the reinforcing ribs 2d and 2d and the width of the door beam 1 (the width of the flange 1a on the inner side in the vehicle body width direction) are substantially the same, the door beam 1 is fitted between the reinforcing ribs 2d and 2d. The positioning effect, the supporting effect, and the reinforcing effect of the door beam 1 can also be expected. The interval between the reinforcing ribs 2d and 2d must be the same as or larger than the width of the door beam 1. This is because if the distance between the reinforcing ribs 2d and 2d is smaller than the width of the door beam 1, the reinforcing ribs 2d and 2d become obstructive and the joint between the door beam 1 and the bracket 2 becomes unstable. Other configurations are the same as those of the embodiment shown in FIGS.

  FIG. 7 shows a bracket 2 according to a further different embodiment of the present invention. The bracket 2 includes a door beam joining piece 2a that is joined to an end of the door beam 1 by bolting along the inner side surface of the flange 1a in the vehicle width direction of the door beam 1 and a bent piece 3a of the inner panel 3. The inner panel joining piece 2b is joined to the inside by bolting, the door beam joining piece 2a connected in an L shape, and the triangular reinforcing piece 2c connecting one side edge side of the inner panel joining piece 2b. The inner panel joining piece 2b is provided with two reinforcing ribs 2e, 2e, which has an effect of reinforcing the inner panel joining piece 2b and thus the bracket 2 as a whole. The reinforcing rib 2e must be raised on the side opposite to the surface to be joined to the inner panel 3. This is because if the rib protrudes toward the inner panel 3, the reinforcing ribs 2d and 2d become obstructive and the joint between the door beam 1 and the bracket 2 becomes unstable. Other configurations are the same as those of the embodiment shown in FIGS.

  8 and 9 show a bracket 2 and a door beam 1 according to still another embodiment of the present invention. The bracket 2 is connected in an L shape to a door beam joining piece 2a in which the end of the door beam 1 is joined by welding, and an inner panel joining piece 2b joined to the inner side of the bent piece 3a of the inner panel 3 by bolting. The door beam joining piece 2a and the inner panel joining piece 2b are composed of triangular reinforcing pieces 2c connecting one side edge side. The door beam joining piece 2a is provided with a recess 2f that is recessed in an arc shape, and is welded in a state in which the cylindrical door beam 1 is fitted. Other configurations are the same as those of the embodiment shown in FIGS.

  FIG. 10 shows a bracket 2 according to still another embodiment of the present invention. The bracket 2 is formed by a plate press, and is composed of a frame-shaped inner panel joining piece 2b that constitutes four sides and a bulging portion 2g surrounded by the inner panel joining piece 2b. Bolt holes are formed in the inner panel joining piece 2b at both upper end portions and lower center portion in the drawing, and are joined to the inner side of the bent piece 3a of the inner panel 3 by bolting. The bulging portion 2g includes a door beam joining piece 2a projecting in a direction orthogonal to the inner panel joining piece 2b, and arranged on both sides of the door beam joining piece 2a and connected to the door beam joining piece 2a and the inner panel joining piece 2b. A pair of triangular reinforcing pieces 2c and 2c projecting from the inner panel joining piece 2b so as to be orthogonal to each other, and a connecting piece 2h connecting the edge of the inner panel joining piece 2b and the reinforcing pieces 2c and 2c and the door beam joining piece 2a. Is done. Other configurations are the same as those of the embodiment shown in FIGS.

  FIG. 11 shows a bracket 2 and an inner panel 3 according to still another embodiment of the present invention. The bracket 2 includes a door beam joining piece 2a that is joined to the end by bolting along the inner side surface of the flange 1a in the vehicle body width direction of the door beam 1 and the inner side of the bent piece 3a of the inner panel 3. The inner panel joining piece 2b joined by bolting, the door beam joining piece 2a connected in an L shape, and the reinforcing pieces 2c and 2c connecting the both side edges of the inner panel joining piece 2b. One of the reinforcing pieces 2c, 2c is triangular and is the same as the reinforcing piece 2c shown in the other embodiments, but the other reinforcing piece 2c is rectangular and is the same as the inner panel joining piece 2b. Two bolt holes are formed in the inner panel 3, and are joined to the bent piece 3a on the lower surface of the inner panel 3 by bolting. That is, the rectangular reinforcing piece 2c plays the same role as the inner panel joining piece 2b in addition to the original reinforcing piece 2c. As described above, when the reinforcing piece 2c is bolted to the bent piece 3a on the lower surface of the inner panel 3, the strength and rigidity of the reinforcing piece 2c are more sufficiently secured. Note that the other reinforcing piece 2c does not necessarily have to be a rectangle, and may have a shape such as the same triangle as the other reinforcing piece 2c as long as it can be provided with a bolt hole. Other configurations are the same as those of the embodiment shown in FIGS.

  In each of the above embodiments, the case of bolting as a joining means and the case of welding are shown only when the cylindrical door beam 1 is adopted, but it is possible to adopt welding joining in all joining. If there is no problem in the bonding strength, any bonding means such as riveting and bonding with an adhesive can be employed. Further, when bolting is used for joining the inner panel 3 and the bracket 2, it is preferable that the bolt hole is a long hole or a loose hole in consideration of absorbing an error in shape accuracy.

  In addition, the door beam 1 is shown to have a pair of parallel flanges 1a, 1a and a pair of webs 1b, 1b connecting the flanges 1a, 1a and a cylindrical one. Flanges 1a, 1a and one web 1b connecting these flanges 1a, 1a, or three webs 1b, and a variety of shapes as long as the strength is secured Can be adopted.

  Further, the reinforcing piece 2c of the bracket 2 connects the side beam edges of the door beam joint piece 2a and the inner panel joint piece 2b, respectively, with the embodiment in which the door beam joint piece 2a and one side edge of the inner panel joint piece 2b are joined. Although the embodiment has been described, the reinforcing piece 2c does not necessarily have to be connected to one side edge or both side edges, and in such a state that it is covered with the door beam joining piece 2a and the inner panel joining piece 2b. You may connect the surface of an intermediate part.

  The door beam mounting structure of the present invention is usually applied to both the front and rear ends of the door beam, but may be applied to only one of them.

It is a longitudinal cross-sectional view which shows one Embodiment of this invention. It is a principal part expansion perspective view which shows the same embodiment. It is a perspective view which shows the bracket used for the embodiment. It is a longitudinal cross-sectional view which shows the rotational deformation of the door beam at the time of the collision load by the side collision of the automatic door of the embodiment acting. It is a perspective view which shows the bracket used for different embodiment of this invention. It is a perspective view which shows the bracket used for further different embodiment of this invention. It is a perspective view which shows the bracket used for further different embodiment of this invention. It is a perspective view which shows the bracket used for further different embodiment of this invention. It is a principal part expansion perspective view which shows the same embodiment. It is a perspective view which shows the bracket used for further different embodiment of this invention. It is a perspective view which shows the attachment state of the bracket to the inner panel of further different embodiment of this invention. It shows a conventional technique, (a) is a main part enlarged vertical sectional view showing the mounting state, (b) is a main part enlarged vertical sectional view showing the bending deformation of the bracket when a collision load is applied, (c) is It is a principal part expanded longitudinal cross-sectional view which shows the sinking deformation of the bracket at the time of a collision load acting. It is a principal part expanded vertical sectional view which shows another prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Door beam 2 ... Bracket 2a ... Door beam joining piece 2b ... Inner panel joining piece 2c ... Reinforcement piece 3 ... Inner panel 3a ... Bending piece 4 ... Outer panel 5 ... Door panel of a car

Claims (5)

An automobile door panel formed by joining the bent pieces of the inner panel formed with bent pieces at both ends in the front-rear direction of the vehicle body and the ends of the outer panel and having a space formed therein; In the door beam mounting structure comprising a long door beam installed in the space inside the door panel and a bracket for attaching the end of the door beam to the bent piece of the inner panel,
The bracket is connected to both the door beam joining piece joined to the end of the door beam, the inner panel joining piece joined to the bent piece of the inner panel, and the door beam joining piece and the inner panel joining piece. Composed of reinforcing pieces and
The door beam attachment structure characterized in that the inner panel joining piece is directed inward in the vehicle width direction along the bent piece of the inner panel.   2. The door beam mounting structure according to claim 1, wherein the reinforcing piece connects one end edge of the door beam joining piece and the inner panel joining piece.   2. The door beam mounting structure according to claim 1, wherein there are two reinforcing pieces, and both side edges of the door beam joining piece and the inner panel joining piece are connected to each other.   The door beam mounting structure according to any one of claims 1 to 3, wherein the reinforcing piece is joined to a bent piece on a lower surface of the inner panel. The door beam mounting structure according to any one of claims 1 to 4, wherein the door beam is disposed close to an outer panel side in a space inside the door panel.

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