JP4731757B2 - Bumpaste - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bumper stay for supporting a bumper reinforcement at a front end of a side member in a vehicle body.
[0002]
[Prior art]
In the vehicle body, side members as skeleton members extend on both sides of the vehicle body, bumper stays are provided at the front ends of the side members, and a bumper reinforcement as a rectangular aluminum alloy or steel pipe is disposed between the bumper stays. ing. The bumper stay is formed in a cylindrical shape having a rectangular cross section by forming a steel plate in a U shape in cross section and combining a pair from both sides. The bumper stay has a plurality of beads as concave bent portions over the entire circumference on the side wall. The bumper stay is crushed at the place where the bead is installed in response to the impact applied to the bumper reinforcement due to a light collision, and the collision load applied to the bumper reinforcement is absorbed by the collapse of the bumper stay. Therefore, the side member, which is the skeleton member of the vehicle body, is protected against impact, and only the bumper reinforcement and the bumper stay can be replaced.
[0003]
On the other hand, the bumper reinforcement is also intended to protect the vehicle headlamps in the event of a light collision. That is, the bumper reinforcement extends somewhat to the outside of the side member (offset), and the headlamp is positioned behind the bumper reinforcement. In other words, the headlamp is located behind the bumper reinforcement that is offset outward from the side member. Light bumps are received by the bumper reinforcement, and its rigidity prevents the headlamp behind it from being affected by the collision. is doing.
[0004]
[Problems to be solved by the invention]
Depending on the design of the vehicle, the offset of the bumper reinforcement from the side member to the outside may be lengthened. In such a case, if an impact due to a collision is applied to the end of the bumper reinforcement, the lengthened offset portion Is pushed from the outermost point, so it breaks at the bolt holes for mounting the side members, which is the weakest part of the structure, and the bumper reinforcement breaks. There was a risk of damage to the headlamps located behind the offset portion of the reinforcement. As a countermeasure, increasing the wall thickness in order to increase the rigidity of the bumper reinforcement itself has a disadvantage in terms of weight as well as cost.
[0005]
The present invention has been made in view of the above problems, and the bumper reinforcement has sufficient rigidity against a collision at the end of the bumper reinforcement that is offset from the side member while maintaining its light weight. The purpose is to grant.
[0008]
According to the first aspect of the present invention, in the bumper stay for supporting the bumper reinforcement provided at the front end of each side member on both sides of the vehicle, the metal thin plate is rectangularly extended between the side member and the bumper reinforcement. a tubular body configured by molding the cross-section of the tubular, and a bead portion formed along a circumferential direction of the cylindrical body, is formed at the front end of the cylindrical body, is fixed to the bumper reinforcement rear And a strut that extends in an intersecting direction with respect to the end of the bumper reinforcement that is offset outward from the side member integrally with the front mounting plate, and the extended end of the strut is the bead portion. A bumper stay characterized in that it is fixed to the cylindrical body on the side member side is provided.
[0009]
The operation and effect of the invention of claim 1 will be explained. Struts are integrally extended from the front side mounting plate of the cylindrical body of the bumper stay so as to intersect the bumper reinforcement end portion, and the extended end portion is extended from the bead portion. By fixing to the cylindrical body on the side member side, the shock absorbing function by crushing the bead part against the collision at the center part can be obtained, and the end part of the strut part extending integrally from the front mounting plate of the bumper stay Is fixed to the cylindrical body on the side member mounting side from the bead part, so that the bumper in the end part collision is not impaired without any loss of the crushing function by the bead part when a collision load is applied to the bumper reinforcement in the front-rear direction. Reinforce reinforcement function is obtained. Since the strut is an integral part of the front-side mounting plate of the bumper stay, the number of parts is small and the configuration can be simplified and the cost can be reduced.
[0010]
According to the second aspect of the present invention, in the bumper stay in the vehicle bumper device, a cylindrical main body formed from a metal plate material, a rear side mounting plate fixed to a rear end of the cylindrical main body, and the rear side From the front side mounting plate that is inclined with respect to the mounting plate and is fixed to the front end of the cylindrical main body, the bead portion that is formed in the cylindrical main body along the circumferential direction, and one end in the inclination direction of the front side mounting plate There is provided a bumper stay including a strut that extends integrally toward the rear side, and an end portion of the strut is fixed to the cylindrical main body on the rear side mounting plate side from the bead portion.
[0011]
The operation and effect of the invention of claim 2 will be described. The strut is integrally extended from the front side mounting plate of the bumper stay, and the extended end portion of the strut is fixed to the cylindrical main body on the rear side mounting plate side from the bead portion. As a result, the bumper stay unit (assembly) can achieve a buffering function in the case of a collision in the front-rear direction and a bumper reinforcement reinforcing function against a collision at the end of the bumper reinforcement.
[0012]
According to a third aspect of the present invention, there is provided a bumper stay according to the first aspect , wherein the fixing of the strut to the cylindrical main body is welding.
[0013]
The operation and effect of the invention of claim 3 will be described. The increase in the weight of the bumper stay due to the provision of the soot struts by welding as the fixing means is not so much, and a compact structure of the bumper stay is realized.
[0014]
According to the invention described in claim 4, there is provided a bumper stay characterized in that in the invention described in any one of claims 1 to 3 , a pair of the struts are provided above and below the cylindrical main body .
[0015]
The operation and effect of the invention of claim 4 will be described. By providing the struts at the top and bottom, the desired reinforcing effect of the bumper reinforcement can be obtained even with a steel plate having a small thickness.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 schematically shows a front part of a body of an automobile related to the present invention. Reference numeral 10 denotes a side member which is a skeleton of the automobile body, and a pair of side members are provided on both sides of the vehicle body. As is well known, the side member 10 is made of a rectangular steel material. A bumper stay 12 is provided at the front end of the side member 10, and a bumper reinforcement 14 is disposed between the bumper stays 12. The bumper reinforcement 14 includes a central linear portion 14-1 and bent end portions 14-2 on both sides, and the bent end portions 14-2 of the bumper reinforcement 14 are offset outward from the side members 10 (free Forming the edge).
[0021]
The bumper stay 12 includes a cylindrical main body 16, and the cylindrical main body 16 is formed by pressing a metal plate material into a rectangular cross section. As shown in FIGS. 2 and 3, the cylindrical main body 16 is bent at its rear end as a flange 16-1, and the rear side mounting plate 18 is fixed to the flange 16-1 by welding. The front side mounting plate 20 is fixed to the front end of the cylindrical main body 16 by welding. As shown in FIG. 2, the cylindrical main body 16 has an inclined rear end face to which the rear side mounting plate 18 is fixed by welding and a front end face to which the front side mounting plate 20 is fixed. 1 corresponds to the inclination angle of the bent end portions 14-2 on both sides with respect to the central linear portion 14-1 in the bumper reinforcement 14 shown in FIG. The rear side mounting plate 18 is fixed to the flange portion 10-1 (FIG. 1) at the front end of the side member 10 by a bolt (not shown). As shown in FIGS. 4 to 6, the front-side mounting plate 20 has bent portions 20-1 at both upper and lower ends, and the front end of the cylindrical main body 16 having a rectangular cross section is inserted between the bent portions 20-1 at both the upper and lower ends. Then, spot welding is performed on the mating surface with the bent portion 20-1 (the spot welded portion is indicated by 22 in FIG. 2), and the cylindrical main body 16 and the front side mounting plate 20 are integrated. Four bolts 24 protrude from the front surface of the front side mounting plate 20 toward the bumper reinforcement 14. The head portion 24-1 of the bolt 24 is welded and fixed to the back surface of the front side mounting plate 20 (see FIG. 6). As shown in FIG. 1, the bolt 24 is inserted into a corresponding bolt hole of the bumper reinforcement 14, and a nut 26 (FIG. 1) is screwed into a protruding end from the bumper reinforcement 14. The reinforcement 14 is attached. Reference numeral 15 denotes a plastic bumper fascia.
[0022]
In FIG. 3, the side wall of the cylindrical body 16 of the bumper stay 12 is formed by pressing two concave grooves in parallel along the circumferential direction, and these concave grooves constitute a bead 27 (bead portion of the present invention) . The bead 27 crushes the cylindrical body 16 of the bumper stay 12 by a force applied from the bumper reinforcement 14 at the time of a light collision in the longitudinal direction of the vehicle, thereby absorbing the impact, and the side member as a skeleton member of the vehicle body from the impact due to the collision. The function of protecting the side member 10 in a light collision is achieved.
[0023]
1 and 4 to 6, the front-side mounting plate 20 of the bumper stay 12 has an extended portion 20A on the outer side in the vehicle width direction, and the upper and lower bent portions 20-1 are similarly extended portions 20-. 1A is formed. And the extension part to back is integrally formed from the extension part 20-1A, and this becomes the strut 28. As shown in FIG. 1, the strut 28 extends in a direction intersecting the bent end portion 14-2 of the bumper reinforcement 14 at an angle close to 90 degrees, and the strut 28 is an upright bent portion 28-1 for its own reinforcement. It has. As shown in FIG. 2, the rearward extending end portion of the strut 28 is fixed to the cylindrical main body 16 at a portion of the rear side mounting plate 18 from the bead 27, and the fixing means is spot welding in this embodiment. The part is indicated by 30.
[0024]
In the bumper structure according to the present invention, in the case of a light collision with an obstacle in front as shown by M in FIG. 1, the impact of the collision is received by the bumper reinforcement 14. The side member 10 which is a skeleton member of the vehicle body can be protected from the impact at the time of collision. Since the strut 28 is parallel or close to the frontal collision, the bumper stay 12 is not reinforced, and the bumper stay 12 is crushed at the intended load at the bead 27. In other words, the strut 28 is installed. Does not impair the buffering function of the bumper stay 12 at all.
[0025]
On the other hand, in the case of a light collision with an inclined obstacle on the side of the vehicle as indicated by N in FIG. 1, the collision is received by the bent end 14-2 of the bumper reinforcement, and the bent end 14 of the bumper reinforcement 14 is received. -2 receives the force in the bending direction as indicated by the arrow f. At this time, since the offset from the side member 10 is large, the bending moment becomes large. If it is left as it is, cracks are likely to occur starting from the insertion hole of the bolt 24 which is the most fragile part, and breakage may occur. In the embodiment, for the force in the direction of the arrow f, since the strut 28 extends in substantially the same direction as the force or at an angle close thereto, the strut 28 functions as a tension, and the bumper rain A resistance force against the displacement of the bent end portion 14-2 of the force 14 in the direction of the arrow f is generated. Therefore, breakage of the side member 10 can be prevented, and components such as the headlamps L provided behind the offset portion of the reinforcement 14 can be protected.
[0026]
In the present invention, it goes without saying that the same effect can be obtained whether the bumper reinforcement 14 is made of steel or aluminum.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of a bumper structure of the present invention.
FIG. 2 is a plan view of the bumper stay of the present invention.
FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
4 is a perspective view of a front mounting plate in the bumper stay of FIG. 2. FIG.
5 is a perspective view showing the front side mounting plate of FIG. 4 as viewed from the direction of arrow V. FIG.
6 is a perspective view showing the front side mounting plate of FIG. 4 as viewed from the direction of arrow VI. FIG.
[Explanation of symbols]
10 ... Side member 12 ... Bumperstay 14 ... Bumper reinforcement
14-1… Bumper Reinforce center straight section
14-2 ... Bumper reinforcement bent end 15 ... Bumper fascia 16 ... Cylinder body 18 ... Rear side mounting plate 20 ... Front side mounting plate 27 ... Bead 28 ... Strut 30 ... Spot weld M ... Front obstacle N ... Obstacle on both sides

Claims (4)

In the bumper stay for supporting the bumper reinforcement provided at the front end of each side member on both sides of the vehicle, the bumper stay extends between the side member and the bumper reinforcement, and is formed by forming a thin metal plate into a rectangular cross-section cylindrical shape A cylindrical main body, a bead portion formed along a circumferential direction of the cylindrical main body, a front side mounting plate formed at a front end of the cylindrical main body and fixed to a rear surface of a bumper reinforcement, and a front side mounting plate It consists of struts extending in the crossing direction with respect to the end of the bumper reinforcement that is offset outward from the side member. The extended end of the strut is fixed to the cylindrical body on the side member side from the bead. It is characterized by that. In a bumper stay in a vehicle bumper device, a cylindrical main body formed from a metal plate material, a rear side mounting plate fixed to a rear end of the cylindrical main body, and a cylindrical main body inclined with respect to the rear side mounting plate A front-side mounting plate fixed to the front end of the front-side mounting plate, a bead portion formed along the circumferential direction of the cylindrical main body, and a strut extending integrally from one end in the inclined direction of the front-side mounting plate toward the rear side. The bumper stay is characterized in that the end portion of the strut is fixed to the cylindrical main body on the rear side mounting plate side from the bead portion. 3. The bumper stay according to claim 2 , wherein the fixing of the strut to the cylindrical main body is welding. In the invention described in any one of claims 1 to 3, bumper stay to the struts and which are located a pair above and below the cylindrical body.

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