WO2008126730A1 - Door impact beam - Google Patents

Abstract

Intended is to provide a door impact beam capable of increasing a buckling strength against an input load. The door impact beam (1) comprises a beam member (10) having two beads (11 and 12) formed in its longitudinal direction, an opening preventing reinforcement (20) for suppressing the deformation of the opening of the beads in the opening direction, and a closing preventing spacer (30) for suppressing the deformation of the bead (11) and the bead (12) in the closing direction.

Description

 Akira Ita

 Door impact beam

Technical field

 The present invention is related to a door impact beam provided inside a vehicle door. Background art

 In recent years, in order to improve safety in the event of a side collision, many vehicles have been provided with door impact beams that disperse and absorb the collision load input during side collisions in the interior space of vehicle doors. . As such a door impact beam, a press-type door impact beam having a cross-sectional shape formed into a corrugated shape by press forming a steel plate is described in Patent Document 1 (Patent Document 1, Patent Document 20). 0 3— 9 4 9 4 3).

Disclosure of the invention

Problems to be solved by the invention

 The door impact beam is formed in a corrugated shape with flat portions and protrusions alternately arranged in parallel at a predetermined pitch, so that a collision load is input from the side of the vehicle and the door impact beam is deformed by bending. The cross-sectional shape is easily deformed. Therefore, in the above-mentioned door impact beam, the buckling strength (rigidity) may be reduced due to the deformation of the cross-sectional shape at the time of a side collision or the like. This tendency is particularly strong near the center in the longitudinal direction of the door impact beam. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a door impact beam that can increase the buckling strength against an input load.

Means for solving the problem

A door impact beam according to the present invention is a door impact beam extending in a vehicle front-rear direction inside a vehicle door, the beam member having a bead formed in an open cross-sectional shape, and the longitudinal direction of the beam member It is provided at the approximate center of the direction and a load is applied from the outside. And a deformation suppressing member that suppresses deformation of the open cross-sectional shape of the bead when pressed.

 According to the door impact beam according to the present invention, since the deformation suppressing member that suppresses the deformation of the bead with respect to the load input from the outside is provided near the central portion in the longitudinal direction of the beam member, for example, the side collision When a collision load is input from the side surface, the deformation of the cross-sectional shape of the bead having an open cross-sectional shape can be effectively suppressed. Therefore, the buckling strength of the door impact beam can be increased.

 In the door impact beam according to the present invention, the deformation suppressing member is preferably provided so as to close the opening of the bead. In this case, it is possible to suppress deformation of the cross-sectional shape of the bead by closing the opening of the bead having an open cross-sectional shape.

 More specifically, it is preferable that the deformation suppressing member is provided between the flanges formed at both ends of the bead opening. In this case, since the flanges formed at the end portions of the beads are coupled by the deformation suppressing member, it is possible to suppress deformation of the bead in the opening direction when a load is input.

 Further, it is preferable that the weakening portion is formed in the deformation suppressing member. In this way, the buckling strength of the door impact beam can be easily adjusted by changing the size and shape of the fragile portion.

 In the door impact beam according to the present invention, it is preferable that the beam member has a plurality of beads formed in parallel to each other, and the deformation suppressing member is provided between adjacent beads. In this case, since the deformation suppressing member is provided between the adjacent beads, it is possible to suppress the deformation between the beads when the load is input.

The deformation suppressing member is preferably an elastic member. In this way, the buckling strength of the door impact beam can be easily adjusted by adjusting the elasticity of the deformation suppressing member. Further, the deformation suppressing member is preferably made of a highly rigid resin. In this way, for example, the shape and size of the deformation suppressing member can be set appropriately and easily by injection molding the deformation suppressing member.

The invention's effect

 According to the present invention, since the deformation suppressing member that suppresses the deformation of the open cross-sectional shape of the bead when a load is input from the outside is provided, the buckling strength of the door impact beam against the input load can be increased. It becomes possible.

Brief Description of Drawings

 FIG. 1 is a perspective view showing a door impact beam according to the first embodiment.

 FIG. 2 is a sectional view taken along line I I-I I in FIG.

 FIG. 3 is a perspective view showing an anti-opening reinforcement.

 Fig. 4 is a cross-sectional view showing the shape change of the door impact beam before and after the load is input.

 FIG. 5 is a perspective view showing a door impact beam according to the second embodiment.

 FIG. 6 is a cross-sectional view taken along the line V I—V I of FIG.

Explanation of symbols

 1, 2 ... Door impact beam, 1 0 ... Beam member, 2 0 ... Opening prevention reinforcement, 2 0a ... Mitigation hole, 3 0 ... Close prevention spacer, 4 0 ... Deformation prevention member. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the figure, the same reference numerals are used for the same or corresponding parts.

 [First embodiment]

First, the door impact beam 1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the door impact beam 1. FIG. 2 is a sectional view taken along line II-II in FIG. Figure 3 shows the opening prevention phosphorus It is a perspective view which shows a force. In this specification, the forward direction when the vehicle is moving forward is defined as “front”, and terms such as front and rear, left and right, and up and down are used.

 The door impact beam 1 is a catching member that extends in the vehicle front-rear direction between an outer panel and an inner panel constituting a vehicle door, and disperses and absorbs a load input at the time of a side collision or the like. Therefore, the door impact beam 1 has a beam member 10 having two beads 1 1 and 1 2 formed in the longitudinal direction of the door impact beam 1 and prevents the opening of the beads 1 1 and 1 2 from being deformed in the opening direction. The reinforcement 20 is configured to include a closing spacer 30 that suppresses deformation between the bead 11 and the bead 12 in the closing direction. The door impact beam 1 is attached to the vehicle door by welding or the like at both ends in the longitudinal direction.

 The beam member 10 is a reinforcing member formed by, for example, pressing a steel plate, and has a substantially U-shaped (open sectional shape) bead 1 1, 1 2, bead 1 1, and bead 1 2 Are formed in a so-called corrugated plate shape. The bead 11 and the bead 12 are formed to extend in the longitudinal direction of the beam member 10 in parallel with each other. Further, a flange 1 1 a is formed at the upper end of the beam member 10, that is, the upper end of the bead 1 1, and a flange 1 2 a is formed at the lower end of the beam member 10, that is, the lower end of the bead 1 2. Has been.

The opening prevention reinforcement 20 includes a flange 1 1 a formed at the upper end of the bead 1 1 and a flange 1 2 a formed at the lower end of the bead 1 2 at the longitudinal center of the door impact beam 1. This is a reinforcing member that suppresses deformation of the beads 1 1 and 1 2 in the opening direction when a load is input by connecting the beads 1 1 and 1 1 2. . The opening prevention reinforcement 20 is, for example, a plate-like member formed by pressing a steel plate. As shown in FIG. 2, elliptical reduction holes 20 a are arranged at predetermined intervals in the longitudinal direction. Three are formed across. Here, the mitigating hole 20 0 a is formed in the weak part described in the claims. Equivalent to. The shape, size, number, etc. of the mitigating holes 20a are appropriately set in consideration of the strength, weight, etc. required for the anti-opening reinforcement 20. Needless to say, the form is not limited.

 The opening prevention reinforcement 20 has a caulking portion 20 b on each of the upper end and the lower end thereof, and the upper and lower caulking portions 20 b are caulked to the flange 1 1 a and the flange 1 2 a. Opening reinforcement 20 is coupled to beam member 10 (bead 1 1, bead 1 2). Adhesive 22 is applied between the caulking portions 1 1 a, 1 2 a and the flat portion 1 3 of the beam member 10 and the flattening prevention reinforcement 20 so that, in addition to caulking, adhesion The opening prevention reinforcement 20 is coupled to the beam member 10 by the agent 22.

 The anti-closing spacer 30 is inserted between the bead 1 1 and the bead 1 2 in the longitudinal center of the door impact beam 1 so that the bead 1 1 and the bead 1 2 are closed. It is a reinforcing member that suppresses deformation. The closing prevention spacer 30 is a member having a substantially U-shaped cross section formed by, for example, pressing a steel plate (see FIG. 2). Each of the opening prevention reinforcement 20 and the closing prevention spacer 30 functions as a deformation suppressing member described in the claims.

 Here, as shown in Fig. 4, against the door impact beam to which the opening prevention reinforcement 20 and the closing prevention spacer 30 are not attached, the right direction of the drawing (the direction of the white arrow) When a collision load is input from force, the opening of the beads 1 1 and 1 2 is deformed in the opening direction and the bead 1 1 and the bead 1 2 are deformed in the closing direction. In Fig. 4, the solid line indicates the cross-sectional shape of the door impact beam before the collision load is input, and the alternate long and short dash line indicates the cross-sectional shape after the collision load is input.

—Meanwhile, in the configuration of the present embodiment described above, when a collision load is input from the same direction as in FIG. 4, the opening of the beads 1 1 and 1 2 is deformed in the opening direction by the opening prevention reinforcement 20. It is suppressed. In addition, the closing spacer 3 0 Therefore, deformation between the beads 1 1 and the beads 1 2 in the closing direction is suppressed. Thus, according to the present embodiment, the opening prevention reinforcement 20 and the closing prevention spacer 30 that suppress deformation of the beads 11 and 12 with respect to a load input from the outside are provided with the beam member 1. Since it is provided at 0, for example, when a collision load is input from the side, deformation of the cross-sectional shapes of the beads 11 and 12 (open deformation and closed deformation) can be suppressed. Therefore, the buckling strength of the door impact beam 1 can be increased.

 Since the door impact beam 1 is coupled to the vehicle door at both ends, the magnitude of the bending load generated in the door impact beam 1 when a collision load is input is the center in the longitudinal direction of the door impact beam 1. The largest in the department. Here, according to the present embodiment, the opening prevention reinforcement 20 and the closing prevention spacer 30 are provided at the center in the longitudinal direction of the beam member 10, and the deformation of the beads 11, 12 is prevented. Since it can be effectively suppressed, the opening prevention reinforcement 20 and the closing prevention spacer 30 can be made smaller and lighter.

 Further, according to the present embodiment, the buckling strength of the door impact beam 1 can be easily adjusted by changing the size, shape, number, etc. of the reduction holes 20a.

 [Second Embodiment]

 Next, the door impact beam 2 according to the second embodiment will be described with reference to FIGS. FIG. 5 is a perspective view showing the door impact beam 2. FIG. 6 is a cross-sectional view taken along the line V I—V I of FIG.

The door impact beam 2 according to the second embodiment has a plate-like opening prevention reinforcement 20 formed by pressing a steel plate as described above, and is formed by pressing a steel plate in the same manner. Instead of the square-shaped closing prevention spacer 30, a deformation prevention member 40 having a substantially trapezoidal cross section formed of a highly rigid foamed resin is used. For other configurations, Since it is the same as or similar to the embodiment, the description is omitted here. In this case, the deformation preventing member 40 corresponds to the deformation suppressing member described in the claims. The deformation preventing member 40 includes a flange 1 1 a formed at the upper end of the bead 1 1 and a flange 1 2 a formed at the lower end of the bead 1 2 in the longitudinal center of the door impact beam 1. Cover (ie, bead 1 1 and bead 1 2 open side) and fill between bead 1 1 and bead 1 2 so that when a load is applied, bead 1 1, 1 2 This is a reinforcing member that suppresses deformation in the direction in which the opening of the bead opens, and also prevents deformation in the direction in which the bead 11 and bead 12 are closed. The deformation preventing member 40 is formed by, for example, induction molding of a highly rigid foamed resin.

 In the above configuration, when a collision load is input from the same direction as in FIG. 4 described above, the deformation preventing member 40 can prevent the opening of the beads 11 and 12 from being deformed in the opening direction. The deformation between the bead 1 1 and the bead 1 2 is suppressed in the closing direction.

 Thus, according to this embodiment, the bead 1

For example, when a collision load is input from the side surface, a bead 1 1, 1 2 is provided because the deformation preventing member 40 that suppresses the deformation of 1, 1 2 is provided at the center in the longitudinal direction of the beam member 10. It is possible to effectively suppress deformation of the cross-sectional shape (opening deformation and closing deformation). Therefore, the buckling strength of the door impact beam 1 can be increased.

 According to this embodiment, the buckling strength of the door impact beam 2 can be easily adjusted by adjusting the elasticity of the deformation preventing member 40.

 Further, according to the present embodiment, by forming the deformation preventing member 40 by injection molding, the shape and size of the deformation preventing member 40 can be set appropriately and easily.

 As mentioned above, although embodiment of this invention was described in detail, this invention is the said embodiment.

7 It is not limited to the state, and various modifications are possible. For example, in the embodiment described above, the number of beads formed on the beam member 10 is 2, but the number of beads is not limited to this.

 Further, the shape, size, arrangement, and the like of the opening prevention reinforcement 20, the closing prevention spacer 30, and the deformation prevention member 40 are not limited to the above embodiment.

Industrial applicability

 The present invention relates to a door impact beam that extends in the vehicle longitudinal direction inside a vehicle door, and includes a beam member having a bead formed in an open cross-sectional shape, and a substantially central portion in the longitudinal direction of the beam member. And a deformation suppressing member that suppresses deformation of the cut surface shape of the bead when an external load is input, so that the buckling strength against the input load of the door integral beam can be increased. Become.

Claims

The scope of the claims  1. A door impact beam extending in the vehicle longitudinal direction inside the vehicle door,  A beam member having a bead formed in an open cross-sectional shape;  A door impact beam, comprising: a deformation suppressing member that is provided at a substantially central portion in the longitudinal direction of the beam member and suppresses deformation of the open cross-sectional shape of the bead when a load is input from the outside.  2. The door impact beam according to claim 1, wherein the deformation suppressing member is provided so as to close an opening of the bead.  3. The door impact beam according to claim 2, wherein the deformation suppressing member is provided between flanges formed at both ends of the opening of the bead.  4. The door impact beam according to claim 3, wherein the deformation suppressing member has a weakened portion.  5. The beam member according to any one of claims 2 to 4, wherein the beam member has a plurality of beads formed in parallel to each other, and the deformation suppressing member is provided between adjacent beads. The door impact beam according to item 1.  6. The door impact beam according to claim 5, wherein the deformation suppressing member is an elastic member.  7. The door impact beam according to any one of claims 2 to 6, wherein the deformation suppressing member is formed of a highly rigid resin.