JPH07164983A - Bumper reinforcement for automobile - Google Patents

Abstract

PURPOSE:To provide a given strength, to improve assembling ability, and to provide a sufficient light effect. CONSTITUTION:A bumper reinforcement 20 comprises a bumper reinforcement body 22 formed of an aluminum extrusion material; and a separator 24 disposed in the bumper reinforcement body 22. A pair of ribs 22A are formed on the front wall part 20A of the bumper reinforcement 20 and a pair of ribs 22B are formed on the rear wall part 20B of the bumper reinforcement 20. The front end part 24A of a steel plate 24 is fitted in a space between a pair of the ribs 22A and both the upper and under surface are nipped therebetween and the rear end part 24B of the steel plate 24 is nipped in a space between a pair of the ribs 22B and both upper and under surfaces are nipped therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper reinforcement for an automobile, which is formed of an extruded aluminum material.

[0002]

2. Description of the Related Art Conventionally, an example of an automobile bumper reinforcement formed of an extruded aluminum material has been known for the purpose of reducing the weight. In order to ensure rigidity, the bumper reinforcement force for automobiles has a cross-sectional shape such as a day shape or a cross shape having a plurality of closed cross-section portions extending in the vehicle width direction. T is around 2 mm. However, if the extrudability of an automobile bumper reinforcement with a closed cross section is extruded using A6063S 200N class aluminum material, the extrudability is 100% higher than that of A6063S 200N class aluminum material. When an automobile bumper reinforcement with a closed cross section is extruded using an A7003S 300N class aluminum material, the aluminum material of the aluminum material is restricted by the shape of the extrusion jig for forming the closed cross section. Extrudability drops to 60%. Therefore, a higher strength aluminum material such as Y
It is extremely difficult to extrude an automobile bumper force with a closed cross section using an aluminum material of S400N grade or higher.

Therefore, the YS40
In order to obtain a predetermined strength, it is not possible to use an aluminum material of 0N grade or higher, and in order to obtain a predetermined strength, as shown in FIG.
As in the automobile bumper force 70 of 2143, a hollow member 78 made of a steel plate, a urethane foam 80, a honeycomb formed body 82 of aluminum, etc. are respectively provided in the closed cross-section portions 72, 74, 76 extending in the vehicle width direction. It is possible to arrange it.

[0004]

However, in the bumper reinforcement 70 for an automobile, the hollow member 78 made of steel plate, the urethane foam 80, the honeycomb formed body 82 made of aluminum, etc. are provided in the closed cross-section portions 72, 74, 76, respectively. Assembling is not good because it needs to be fixed with an adhesive. Further, due to the fixing by the adhesive, when the flatness of the inner surface of the closed cross section is not good, the hollow member 78 made of steel plate is likely to be peeled off from the inner peripheral surface of the closed cross section 72.

In view of the above facts, it is an object of the present invention to obtain a bumper reinforcement for an automobile, which can obtain a predetermined strength, has a good assembling property, can be made thin, and can achieve a sufficient weight effect.

[0006]

According to a first aspect of the present invention, there is provided a bumper force body for a vehicle, the bumper force body having a closed cross section structure formed of an aluminum extruded material and extending in a vehicle width direction, and the closed cross section. A reinforcing plate member provided in the structure along the vehicle width direction and having both ends abutting the facing surfaces of the closed cross-section structure to divide the inside of the closed cross-section structure by a cut surface along the vehicle width direction, and the closed cross-section structure. And a holding portion that is provided along the vehicle width direction on the inner peripheral portion of the holding member and that fits with both ends of the reinforcing plate member and prevents the both ends from being displaced in a direction orthogonal to the vehicle width direction. There is.

[0007]

In the automotive bumper reinforcement of the present invention,
When a compressive force is applied to the opposing surfaces of the closed cross-section structure of the bumper reinforcement body, the opposing surfaces move toward each other. At this time, the reinforcing plate member provided in the closed cross-section structure along the vehicle width direction and having both ends in contact with the facing surfaces of the closed cross-section structure bends to control the compressive deformation of the bumper reinforcement body. Therefore, the bumper reinforcement for an automobile can be made to have a predetermined strength depending on the arrangement position of the reinforcing plate material, the strength, and the like. Further, since both ends of the reinforcing plate member are fitted to the holding portions provided on the inner peripheral portion of the closed cross-section structure, the both ends are prevented from being displaced in the direction orthogonal to the vehicle width direction. Due to the compressive deformation of the force body, both end portions of the reinforcing plate material are not easily separated from the inner peripheral portion of the closed cross-section structure, and the compressive deformation of the bumper lining force body can be reliably controlled by the reinforcing plate material.

Therefore, in this automobile bumper force, a predetermined strength can be obtained, and since the reinforcing plate material is not integrally formed, the thickness can be reduced and a sufficient weight effect can be obtained.

In addition, in this automobile bumper force, both ends of the reinforcing plate material may be fitted to the holding portion in the closed cross-section structure of the bumper force body at the time of assembling, and the assembling property is good.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bumper reinforcement for an automobile of the present invention will be described with reference to FIGS.

In the figure, an arrow FR indicates a vehicle front direction, an arrow IN indicates a vehicle inside direction, and an arrow UP indicates a vehicle upward direction.

As shown in FIG. 5, the vehicle bumper 10 is shown.
Are arranged in the lower part of the front end of the front body 12 along the vehicle width direction.

As shown in FIG. 3, the bumper 10 includes a thin resin bumper cover 14, a low-pressure foam urethane foam 16 inserted into the bumper cover 14, the bumper cover 14 and the urethane foam 16 and a front side member 18. It consists of a bumper reinforcement 20 that is fixed to. The upper portion of the bumper cover 14 is fixed to the body with bolts, and the lower portion is fixed to the lower surface of the bumper reinforcement 20 with bolts.

As shown in FIG. 2, the bumper reinforcement 20 includes a bumper reinforcement body 22 and a bumper reinforcement body 22 made of an aluminum extruded material having a closed cross-sectional structure having a rectangular cross-section when viewed from the vehicle width direction. And a separator 24 composed of two steel plates as reinforcing plate members arranged horizontally in parallel along the vehicle width direction. The separator 24 is arranged at a position near the front side member mounting position of the bumper reinforcement body 22 where a compressive load is likely to act, that is, in the vicinity of both ends of the bumper reinforcement body 22 in the vehicle width direction. Further, through holes 26 for attachment to the three front side members are formed at both ends of the rear wall of the bumper reinforcement 20 in the vehicle width direction so as to be apexes of triangles.

As shown in FIG. 4, the front side members 18 are respectively arranged below both ends of the front body 12 in the vehicle width direction along the front-rear direction, and the front end portions 18A of the front side members 18 are Three through holes 21 for mounting the bumper reinforcements 20 are provided respectively.

As shown in FIG. 1, bolts 28 pass through the through hole 21 of the front side member 18 and the through hole 26 of the bumper reinforcement 20 from the bumper reinforcement 20 side toward the front side member 18 side. The weld nut 30 is welded to the front end portion 18A of the front side member 18 from the rear side.

Therefore, the bumper reinforcement 20 is fixed to the front end portion 18A of the front side member 18 by these bolts 28.

The sectional shape of the bumper reinforcement 20 as viewed from the vehicle width direction is a letter-like shape having three closed sectional portions 31. In addition, a pair of ribs 22A serving as holding portions are provided inside the front wall portion 20A of the bumper reinforcement 20.
However, the ribs 22A are formed in two places at substantially equal intervals in the vertical direction, and these ribs 22A are formed along the vehicle width direction. Inside the rear wall 20B of the bumper reinforcements 20,
A pair of ribs 22B serving as holding portions are formed at positions facing the ribs 22A.

A separator 24 is provided between the pair of ribs 22A.
The front end portion 24A of is fitted and the upper and lower surfaces are sandwiched,
The rear end portion 24 of the separator 24 is provided between the pair of ribs 22B.
B is fitted and both the upper and lower sides are clamped.

Therefore, the separator 24 can be fitted in or removed from the bumper reinforcement body 22 by moving in the vehicle width direction with respect to the bumper reinforcement body 22. In the fitted state, the pair of ribs 22A, 22B
However, both ends 24A and 24B of the separator 24 are prevented from shifting in the vertical direction of the vehicle body.

The front wall portion 20A of the bumper reinforcement 20 has through holes 3 for bolting work.
4 is drilled.

Next, the operation of this embodiment will be described. In the automotive bumper force 20 of the present embodiment, when a compressive force acts on the front wall portion 20A and the rear wall portion 20B of the bumper reinforcement body 22, the front wall portion 20A and the rear wall portion 20B move toward each other. Moving. At this time, both ends 24A and 24B provided along the vehicle width direction in the closed cross-section structure bend the separator 24 that abuts on the front wall portion 20A and the rear wall portion 20B, respectively, and the bumper reinforcement body 22 is Controls compression deformation. Therefore, the separator 24
The bumper reinforcement 20 for an automobile can have a predetermined strength depending on the arrangement position, strength, and the like.

Further, both ends 24A, 2 of the separator 24 are
4B is a pair of ribs 2 provided on the inner peripheral portion of the closed cross-section structure.
2A and a pair of ribs 22B are fitted to each other, and both end portions 24
Since the vertical displacement of A and 24B is prevented,
Due to the compressive deformation of the bumper reinforcement body 22, both end portions 24A and 24B of the separator 24 are moved to the front wall portion 20A.
Since the separator 24 does not easily come off from the rear wall portion 20B, the compression deformation of the bumper reinforcement body 22 can be reliably controlled by the separator 24.

Therefore, in the bumper reinforcement 20 for an automobile, a predetermined strength is obtained and the separator 2 is used.
Since 4 is not integrally formed with the bumper reinforcement body 22, it can be made thin and a sufficient weight effect can be obtained.

Further, in the automotive bumper force 20, the both ends 24A and 24B of the separator 24 are fitted to the pair of ribs 22A and the pair of ribs 22B in the closed cross-section structure of the bumper force body 22 during assembly. All you have to do is good assembling.

In this embodiment, the separator 24 is
The separator 24 is arranged in the vicinity of both ends in the vehicle width direction where a compressive load acts in the bumper reinforcement 20, but the separator 24 may be arranged in the entire bumper reinforcement 20.

Further, in the present embodiment, the separator 24 is arranged in the bumper force 20 in a cross-sectional shape, but
The separators 24 may be arranged in a sun-shaped cross section, or three or more separators may be arranged in parallel. Also, as shown in FIG.
The separator 44 as a reinforcing plate material may have a cross-section in a cross-section. In this case, a pair of ribs 22C serving as holding portions are provided inside the upper wall portion 20C of the bumper reinforcement 20.
And a pair of ribs 22D as holding portions are formed inside the lower wall portion 20D of the bumper reinforcement 20 at positions facing the ribs 22C, and the upper end portion 44C and the lower end portion 44D of the separator 44 are formed. Sandwich each.

Further, as shown in FIG. 7, the separator 2
The rib 22A has a T-shaped cross section at the end 24A of the No. 4 end.
The cross-sectional shape may be an L-shaped cross-section that encloses the end portion 24A of the separator 24. Also, as shown in FIG.
The cross-sectional shape of the end portion 24A of the separator 24 is U-shaped, and the cross-sectional shape of the rib 22A is the end portion 2 of the separator 24.
It may have an I-shape that fits within 4A.

In this embodiment, a steel plate is used as the separator 24, but the separator 24 is not limited to the steel plate.
Other high-strength plate materials such as stainless steel and alloys may be used.

[0030]

The automotive bumper reinforcement of the present invention is provided with a bumper reinforcement body formed of aluminum extruded material and having a closed cross-section structure extending in the vehicle width direction, and provided inside the closed cross-section structure along the vehicle width direction. And a reinforcing plate member having both ends abutting the facing surfaces of the closed cross-section structure to divide the inside of the closed cross-section structure by a cut surface along the vehicle width direction; A holding portion that fits with both ends of the reinforcing plate member and prevents the both ends from shifting in a direction orthogonal to the vehicle width direction,
Since it has a constitution having a predetermined strength, it has an excellent effect that a predetermined strength can be obtained, the assembling property is good, the thickness can be reduced, and a sufficient light weight effect can be obtained.

[Brief description of drawings]

1 is a sectional view taken along line 1-1 of FIG.

FIG. 2 is a perspective view showing a bumper reinforcement for an automobile according to an embodiment of the present invention as seen from an oblique rear side.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view of a front side member to which a bumper reinforcement for an automobile according to an embodiment of the present invention is attached, as seen from an obliquely front outer side.

FIG. 5 is a perspective view of a vehicle to which a bumper reinforcement for an automobile according to an embodiment of the present invention is applied, viewed from diagonally front.

FIG. 6 is a side sectional view showing a bumper reinforcement for an automobile according to another embodiment of the present invention.

FIG. 7 is a side sectional view showing a holding portion of a bumper reinforcement for an automobile according to another embodiment of the present invention.

FIG. 8 is a side sectional view showing a holding portion of an automotive bumper reinforcement according to another embodiment of the present invention.

FIG. 9 is a side sectional view showing a bumper reinforcement for an automobile according to a conventional example.

[Explanation of symbols]

 20 Bumparin Force 20A Front Wall Part 20B Rear Wall Part 22 Bumparin Force Body 22A Rib (Holding Part) 22B Rib (Holding Part) 22C Rib (Holding Part) 22D Rib (Holding Part) 24 Separator (Reinforcing Plate) 31 Closed Section Part 44 Separator (reinforcing plate material)

Claims (1)

[Claims] 1. A bumper reinforcement body formed of aluminum extruded material and having a closed cross-section structure extending in the vehicle width direction, and both ends of the bumper reinforcement body provided along the vehicle width direction in the closed cross-section structure. A reinforcing plate member that abuts the facing surface and divides the inside of the closed cross-section structure by a cutting surface along the vehicle width direction, and both end parts of the reinforcing plate member provided along the vehicle width direction on the inner peripheral portion of the closed cross-section structure. A bumper reinforcement for an automobile, comprising: a holding portion that is fitted to the holding portion and that prevents the both end portions from being displaced in a direction orthogonal to a vehicle width direction.