KR960010156B1 - Impact bar for car door - Google Patents

Abstract

a tube-shaped body of high tension steel installed between a door outer panel and a door inner panel; a bar reinforcing member in the middle part of the body at a specified angle to the upper part. The impact bar improves resistance against bending load(impact load) and prevents local bending effect for securing safety of the driver and passengers.

Description

Door impact bar of car

1 is a schematic structural diagram of an impact bar installed in a general automobile door.

2 shows an example of a conventional impact bar application.

3 is a cross-sectional configuration of the installation state of the automobile door impact bar according to the present invention.

4 is a schematic perspective view of the impact bar of the present invention.

5 is a front structural view of FIG.

6 is a graph of the comparison of reaction force against impact bar displacement of the present invention and conventional ones.

7 is a comparative graph in the case where the vertical 90 and 45 degree inclinations are formed at both ends of the door reinforcement member installed in the center of the aspect bar of the present invention, and joined as a welding and an adhesive.

The present invention relates to an impact bar installed inside the door in order to ensure driver and passenger safety in the event of a side collision in which the door of the vehicle is installed. In particular, the center of the impact bar which is rolled between the door outer panel and the inner panel of the vehicle By installing a bar reinforcement member with a predetermined angle inclined upward, the local buckling effect effectively prevents the side impact of the door of the car and improves the resistance against bending load of the impact bar to improve driver and passenger safety. It is about a door impact bar of a car which can be planned.

In general, the door portion located on the side of the vehicle, in order to ensure the safety of the passengers in the event of a side collision of the vehicle by staggering the tube or plate-shaped impact bar in the inner view to be fixed by welding, so that It is to improve impact.

In the conventional installation structure of the impact bar for automobiles related to this technique, as shown in FIG. 1, the impact bar having a tube shape formed of high-strength steel between the inner brackets 10 and 10 'of the door of the vehicle is shown. 11) is structured to be gibberish.

As described above, when simply impacting the impact bar 11 inside the door, the cross section size of the central portion must be larger than the cross section size of both ends due to the characteristics of the impact bar, while effectively resisting the bending load due to the impact. If the same cross section is maintained as described above, there is a problem in that the buckling phenomenon occurs at the impact site during the collision of the vehicle, so that the resistive force drops sharply.

On the other hand, impact bars for automobiles have also been proposed in Japanese Laid-Open Patent Publication No. 56-60725.

That is, the structure is such that, as in FIG. 2, the reinforcing member 21 is installed by welding W at the central portion of the impact bar 20 on the plate that is rolled into the door.

Accordingly, as described above, the cross-section size of the center portion of the impact bar is larger than the cross-sectional size of both sides so as to effectively cope with the bending load generated during the collision.

However, even when the center cross section is enlarged by the reinforcing member 21 as described above, when the external vehicle collides due to the residual stress after welding and the change in the vertical cross section due to the sudden change of the cross section due to the installation of the rectangular reinforcing member at the center of the impact bar. There was a problem in that the local buckling phenomenon easily occurs at the cross-sectional change site is vulnerable.

The present invention is to improve the general conditions and problems as described above, the object of the bar reinforcement member is formed at a certain angle upward in the center of the impact bar that is rolled between the door outer panel and the door inner panel of the vehicle By installing it as an adhesive material, it is possible to effectively prevent the local buckling phenomenon against the collision of the door side of the car and to further improve the safety of the driver and the passenger by further improving the resistance to the bending load (impact load) of the impact bar. It is to provide a door impact bar of a car that can be secured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a front sectional configuration diagram of an installation state of an automobile door impact bar according to the present invention, and FIG. 4 is a schematic perspective view and FIG. 5 of the impact bar of the present invention as a front view structural diagram of FIG. In the center of the impact bar 1, which is laid out between the door inner panel 3 and the door inner panel 3, inclined portions 4, 4 'inclined at about 35 to 55 degrees from the upper side to the lower side in order to sequentially increase the cross-sectional area of the impact bar. The bar reinforcing member 5, which is a provided high-strength steel pipe, is constructed by welding or adhesively installed.

6 and 6 ', which are not described in the drawings, are brackets in which both ends of the impact bar 1 are rolled into the door.

Referring to the embodiment of the present invention having such a configuration as follows.

A high-strength steel pipe composed of tensile strength 1450, 4 kg / cm ² and elongation 8.7% is used as the bar reinforcing member 5 in the center of the impact bar 1, which is rolled out inside the door of the vehicle, and is rotated 35 to 55 degrees downward from the top thereof. After the photographic slopes 4 and 4 'are formed at both ends, they are fixed by welding or adhesive to the center portion of the impact bar 1.

As a reason for forming the inclined portions 4 and 4 ′ which are inclined upwardly and downwardly at both end portions of the bar reinforcing member 5 provided in the center of the impact bar 1, the center of the impact bar 1 is provided. This is to prevent a sudden change in the cross-sectional area due to the installation of the bar reinforcing member (5) in the site, so as to increase the cross-sectional area sequentially.

In addition, the reason for limiting the inclination angle of both ends of the bar reinforcing member 5 to 35 to 55 degrees, when the inclination angle is 35 degrees or less, the edge end length of the bar reinforcing member 5 becomes long, and easily breakage occurs. When the inclination angle is 55 degrees or more, the cross-sectional area of the impact bar rapidly grows, and is caused by local deformation in this area. In the embodiment of the present invention, the inclination angles of both ends of the bar reinforcing member 5 are most suitable. 45 degrees is preferable.

In addition, the bar reinforcing member 5 installed at the center of the impact bar is fixed to the impact bar 1 in a rigid state by engaging both ends of the bar reinforcement member by adhesive or welding.

On the other hand, by applying a deformation to the impact bar (1) of the present invention as described above is shown in Table 1 compared with the conventional impact bar.

TABLE 1

As shown in the graphs of Tables 1 and 6, the impact bar according to the present invention is remarkably superior to the conventional impact bar.

In addition, the results of measuring the reaction force (Kgf) according to each displacement by forming the inclined portion of the vertical (90 degrees) and 45 degrees both ends of the bar reinforcing member installed on the impact bar of the present invention as a welding or adhesive It was.

TABLE 2

As shown in the comparison graph of Table 1 and Figure 7, the bar reinforcement member mounted on the impact bar of the present invention was found to be superior to the vertical state to form a slope of 45 degrees at both ends.

As described above, according to the door impact bar of the vehicle according to the present invention, the resistance to the bending load (impact load) of the impact bar is further improved as in the comparative example, and the local buckling phenomenon of the impact bar is effectively prevented. And there is an excellent effect that can ensure the safety of the passengers.

Claims (4)

In the impact bar which is laid out between the door outer panel and the door inner panel of the vehicle, in the center of the impact bar, the inclined portion is inclined 35 to 55 degrees from the top to the bottom in order to increase the cross-sectional area in the center of the impact bar on both sides Door impact bar of a vehicle, characterized in that the configuration consisting of a bar reinforcement member is a high-strength steel pipe. The door impact bar of an automobile according to claim 1, wherein the bar reinforcement member installed at the center of the impact bar is fixed to the adhesive bar as an adhesive. The door impact bar of an automobile according to claim 1, wherein the bar reinforcing member installed at the center of the impact bar is fixed by welding. The door impact bar of claim 1, wherein both end portions of the bar reinforcement member installed at the center of the impact bar are inclined at an angle of 45 degrees from the upper side to the lower side.