JP2011168076A - Diving prevention device of large-sized vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and efficiently reinforce a diving prevention beam, regardless of low cost, regarding a diving prevention device of a large-sized vehicle such as a truck. <P>SOLUTION: The diving prevention beam 16 is located on a lower side of a frame 10 at an end part of the vehicle and is extended in a vehicle width direction. An upper part bracket 18 fixed to the frame 10 is extended downward to the front, a lower part bracket 20 is fastened to a front end with a bolt, and the upper and lower part brackets 18 and 20 are fastened with bolts and nuts. A reinforcing plate 28 is welded to a bottom surface of the diving prevention beam 16, and the lower part bracket 20 and the reinforcing plate 29 are welded to form a triangular closed section 30 inside the diving prevention beam 16. The reinforcing plate 29 is extended up to a bent end part of the diving prevention beam 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus for preventing the dive of a large vehicle such as a truck having a large vehicle height.

  In the event of a collision between a large vehicle, such as a truck with a large vehicle height, and a passenger car, the front bumper of the large vehicle is at a high position, so there is an accident that the front part of the passenger car gets under the front bumper of the large vehicle. May happen. In view of this, it has become mandatory to install a dive prevention device (so-called under-run protector). This type of anti-dive device includes an anti-dive beam at a position lower than the front bumper behind the bumper fascia. The diving prevention beam is structured to be attached to the vehicle body via a mounting bracket (Patent Documents 1 and 2).

JP 2006-036071 A JP 2007-186051 A

  In the prior art, since the bracket for attaching the anti-dive beam to the vehicle body (frame) basically has a cantilever structure, there is a problem that the anti-dive beam tends to break near the bracket due to external force from outside the vehicle body. It was. In the case of the conventional structure, it is difficult to secure the installation space for the reinforcing member, and there is a problem that the cost increases even if possible.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to efficiently reinforce a diving prevention beam regardless of simple and low cost.

  The intrusion prevention device at the vehicle body end of the large vehicle according to the present invention is located below the vehicle body at the vehicle end and extends in the vehicle width direction, one end is attached to the end of the vehicle body, and the other end is A bracket with an extension part that is fixed to the inside surface of the body of the anti-submersion beam and extends somewhat downward from the inner side surface of the body part of the anti-intrusion beam to the inside of the vehicle, and fixed to the lower surface of the anti-subduction beam. And a reinforcing plate extending inward of the vehicle from the prevention beam, and the extending edge of the reinforcing plate is welded so as to form a closed cross section on the back surface of the prevention beam from entering the inwardly extending portion of the bracket. It is characterized by that.

  The bracket may be composed of a first portion attached to an end portion of the vehicle body and a second portion fixed to the inner surface of the vehicle body of the anti-recession beam and having the extension portion, and the first portion of the bracket. The first part and the second part are bolted.

  Further, the reinforcing plate can be extended to the respective end portions in the vehicle body width direction of the dive prevention beam.

  According to the present invention, the reinforcing plate fixed to the lower surface of the anti-subduction beam is fixed to the extension portion of the bracket that extends somewhat downward from the inner side surface of the vehicle body to the inner side of the vehicle body. Thus, a closed cross section is formed on the back surface of the anti-dive beam, so that the bending strength can be greatly increased with respect to the input from the outside of the vehicle body.

  Due to the divided structure of the bracket, it becomes easy to mount the anti-retraction device to the existing vehicle. In addition, by extending the reinforcing plate to the end of each anti-snipping beam in the vehicle width direction, efficient reinforcement against the external force of the outside of the vehicle body, especially from the end in the vehicle width direction, is achieved. can do.

FIG. 1 is a partial cross-sectional view (a cross-sectional view taken along the line I-I in FIG. 2) of the apparatus for preventing the intrusion of a large vehicle of the present invention from the side. FIG. 2 is a schematic perspective view of the apparatus for preventing the intrusion of a large vehicle according to the present invention. FIG. 3 is a graph schematically showing the result of strength analysis by a simulation experiment of the apparatus for preventing the intrusion of a large vehicle according to the present invention.

  Hereinafter, although the embodiment of the present invention will be described with respect to the front portion of the vehicle, the rear portion of the vehicle can be similarly configured. In FIG. 1, an imaginary line 10 schematically shows a front part of a vehicle body (frame) of a large vehicle such as a truck as viewed from the side, and the frame extends to both sides of the vehicle as shown in the perspective view of FIG. A front bumper 12 extending in the vehicle width direction is attached between the front ends of the frame 10. In FIG. 1, an imaginary line 14 indicates a bumper fascia. As is well known, the bumper fascia is formed of a resin material, the upper end is fixed to the front bumper 12, and the lower end covers the front of the lower part of the vehicle body. It extends downward. In the case of a large vehicle such as a truck, since the front bumper 12 is located at a position considerably higher than the road surface, a considerably wide space is formed below the front bumper 12, and in the case of a collision with a passenger car, the front end of the passenger car There is a possibility that the portion may sink under the front bumper 12, and as a countermeasure against this, it is necessary to install a sinking prevention device.

  Explaining the configuration of the intrusion prevention device of the present invention, the intrusion prevention beam 16 is made of a steel material having a rectangular cross section and extends in the vehicle width direction. As shown in FIG. 2, both end portions in the vehicle width direction of the dive prevention beam 16 have bent portions 16-1 that are somewhat rearward (inward of the vehicle). The anti-subduction beam 16 is positioned at a height near the ground below the front bumper 12 as a countermeasure against subtraction, but the front surface is covered with a bumper fascia 14. The bracket for attaching the anti-dive beam 16 to the frame 10 extends somewhat downward and forward from the frame 10, and in this embodiment, the upper bracket 18 (the bracket of the present invention) fixed to the frame 10 is used. This is a two-part configuration of a first part) and a lower bracket 20 (the bracket second part of the present invention) fixed to the anti-snipping beam 16. By using two parts, it becomes easy to mount the anti-retraction beam 16 on an existing frame. The upper bracket 18 is configured such that the upper end is fixed to both side wall surfaces at the front end of the frame 10 and includes a bolt hole 18A for that purpose. The upper bracket 18 extends forward from the vehicle body while inclining downward from the attachment portion of the frame 10, and includes bent portions 18-1 and 18-2 (FIG. 2) in the vehicle width direction at the front end portion. On the other hand, the lower bracket 20 is generally wider than the upper bracket 18, and the upright portion of the lower bracket 20 is welded to the upright rear surface of the anti-subduction beam 16 and is inclined downward from the upright portion welded to the anti-subduction beam 16. An extending portion 20-1 extending rearward of the vehicle body is provided. The bent portions 18-1 and 18-2 of the upper bracket 18 are overlapped with the upper portion (upright portion) and the lower portion (extending portion 20-1) of the lower bracket 20 and fastened by bolts 24 and nuts 26, respectively. . A reinforcing backing plate 22 is applied to the bent portion 18-1 of the upper bracket 18 via an upright portion of the lower bracket 20, and is fastened by bolts and nuts 24 and 26.

  The intrusion prevention device of the present invention further includes a reinforcing plate 28, and the reinforcing plate 28 is welded and fixed so that the front end portion thereof is flush with the bottom surface of the intrusion preventing beam 16 as shown in FIG. Has been. As shown in FIG. 1, the reinforcing plate 28 has an extending portion 28-1 whose rear end is directed rearward, and an end edge of the extending portion 28-1 is an extending portion inclined downward in the lower bracket 20. 20-1 is contacted with the opposing surface and the contact portion is welded (the weld portion is indicated by w). Therefore, a triangular closure is formed between the anti-subduction beam 16, the lower bracket 20, and the reinforcing plate 28. The cross section 30 is formed, and the attachment portion of the anti-retraction beam to the frame by the bracket can be strengthened. Further, as shown in FIG. 1, the reinforcing plate 28 extends on both sides of the bracket (both sides in the vehicle width direction) along the lower surface of the anti-dive beam 16, and the outer end 28-1 is the end of the anti-dive beam 16. It reaches the bent part 16-1.

  FIG. 3 schematically shows the result of a simulation experiment (test showing the effect of the reinforcing plate 28) by the finite element method of the loader displacement and the loader reaction force in the external force load with respect to the diving prevention beam 16 (load application site). 2 is indicated by a line a, and a characteristic when the reinforcing plate 28 is omitted from the structure of FIG. 2 is indicated by a line b. The function of preventing the sinking can be enhanced by the reinforcing effect obtained by forming the closed cross section 30 behind the reinforcing plate 28 in the present invention.

  In addition, the lower bracket 20 on the welding side to the anti-dive beam 16 is wide, and the reinforcing plate 28 extends to the bent part 16-1 at the end of the anti-dive beam 16, so that the width direction of the vehicle body is increased. Efficient reinforcement can be realized with respect to the input from the end side.

DESCRIPTION OF SYMBOLS 10 ... Frame 12 ... Front bumper 14 ... Bumper fascia 16 ... Dive prevention beam 18 ... Upper bracket (bracket 1st part of this invention)
20 ... Lower bracket 20 (the bracket second portion of the present invention)
28 ... Reinforcing plate 30 ... Triangular closed section

Claims (3)

  An apparatus for preventing an intrusion at the end of a vehicle body of a large vehicle, wherein the intrusion prevention beam is positioned below the vehicle body at the end of the vehicle and extends in the vehicle width direction, and one end is attached to the end in the vehicle body length direction. Is fixed to the inner surface of the body of the anti-submersion beam, and is fixed to the lower surface of the anti-submersion beam, with a bracket having an extension extending slightly downward from the inner surface of the body of the anti-submersion beam to the inside of the vehicle, A reinforcing plate extending inward of the vehicle from the anti-dive beam, and the extending edge of the reinforcing plate forms a closed cross section on the back surface of the anti-dive beam with respect to the inwardly extending portion of the bracket A device for preventing the dive of a large vehicle, which is fixed.   The invention according to claim 1, wherein the bracket comprises a first portion attached to an end portion of the vehicle body, and a second portion fixed to the vehicle body inner side surface of the anti-submersion beam and provided with the extending portion, An apparatus for preventing a vehicle from getting into a large vehicle, wherein the first part and the second part of the bracket are bolted.   3. The apparatus according to claim 2, wherein the reinforcing plate is extended to respective end portions in the vehicle body width direction of the anti-intrusion beam.

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