JPH0415141A - Structure for attaching bumper for car - Google Patents

Abstract

PURPOSE:To enhance the light collision performance and the sintering energy absorption performance of a bumber by providing at the end portion of a car body member an energy absorbing member capable of being crushed and deformed by the input of a collision, and also providing an armature destructing means which interferes with a bumper armature to crack the same. CONSTITUTION:A bumper armature 2 disposed inside a bumper facer is made of a fiber reinforced resin material and formed into a roughly U-shaped section. At portions of both sides of the bumper armature 2 which correspond to the ends of a car body member 10 bracket portions 6, 7 are extended over upper and lower walls 3, 4 and have their flanges 6a, 7a joined together by the flange 11a of a bumper bracket 11. In this case, an energy absorbing member 14 protruding into the bumper armature 2 and capable of being crushed and deformed by the input of a collision is provided at the end portion of the car body member 10. Protruding pieces 18 each of which serves as a destructing means 17 are joined to the upper and lower portions of the bumper bracket 11 in the direction perpendicular to the respective rear edges of the bracket portions 6, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automobile bumper, and more particularly to a mounting structure for an automobile bumper having a bumper armature made of fiber-reinforced resin material inside the bumper fascia.

Conventional technology Figures 5 to 7 show examples of the application of resin bumper armatures that follow the mounting structure of conventional steel plate bumper armatures, and 1 in the figure shows a bumper fascia made of an elastic material such as resin. , 2 is a bumper armature disposed inside the bumper fascia 1, which is made of a fiber-reinforced resin material such as SMC or stampable sheet and is formed into a substantially U-shaped cross section. On both sides of the bumper armature 2, upper and
Bracket portions 6.7 are integrally extended in a straight line on the door walls 3 and 4. On the other hand, a bumper bracket II is joined to the end of the vehicle body member 10, and the bracket part 6,
The flanges 6a, 7a at the end edges of the bumper bracket II are brought into contact with the flanges IIa of the bumper bracket II, and the bolt/nut 12 is tightened.
It is a combination.

Reference numeral 13 in FIG. 5 indicates a cross member that connects the vehicle body members 10 on both sides. This similar structure is, for example,
This is shown in Japanese Patent No. 2335.

Problems to be Solved by the Invention The bracket part 67 is formed into a substantially trapezoidal planar shape with the rear edge gradually narrowing from the upper and lower walls 3 and 4.
By increasing the dimension of the connecting portion with the lower walls 3 and 4 in the vehicle width direction and extending straight from these upper and lower walls 3.4,
By increasing the rigidity around the attachment part to the vehicle body member 10, the fixed parts of the bracket parts 6 and 7 can obtain the necessary reaction force in the event of a light collision, promoting elastic deformation of the central part of the armature and reducing collision energy. It can be absorbed.

Therefore, in the event of a high-speed collision, the bumper armature 2 remains at the end of the vehicle body member 10 without crashing, and the crushing deformation of the vehicle body member 10 has a considerable adverse effect on the collision energy absorption characteristics.

Therefore, the present invention does not impair the light collision performance of the bumper armature, and in the event of a high-speed collision, the bumper armature can be easily crashed at the end of the vehicle body member, and the immersion mode of the vehicle body member is prevented. To provide a mounting structure for a bumper for an automobile, which can expand the damping stroke of the vehicle body member and improve collision energy absorption performance without causing damage.

Means for Solving the Problem The bumper armature placed inside the bumper fascia is made of fiber-reinforced resin material and is formed to have an approximately pentagonal cross section.
In this structure in which the upper and lower rear end edges of both sides of the bumper armature are fastened and fixed to the ends of the vehicle body member, the ends of the vehicle body member protrude into the bumper armature and can be crushed and deformed by a collision input. In addition to protruding the energy absorbing member, armature breaking means is provided which interferes with the bumper armature and generates a crack when the bumper armature is deflected in the longitudinal direction by a predetermined amount or more.

In the event of a light collision of a vehicle, the bumper armature is slightly bent forward and backward at the portion corresponding to the end of the vehicle body member, but due to the shape effect of the approximately U-shaped cross section, the bending stroke in the front and rear direction is suppressed slightly. This creates the necessary reaction force and promotes elastic deformation of the armature's central portion without interfering with the destructive means, thereby demonstrating the future light collision performance of fiber-reinforced resin bumper armatures. In the event of a high-speed collision, if the bumper armature at the end of the vehicle body member bends and deforms in the longitudinal direction beyond a predetermined stroke and interferes with the destruction means,
Cracks occur in the portion of the bumper armature that interferes with the destruction means, and this crack causes the bumper armature to crash without retaining its original shape. Due to this crash, the strength of the bumper armature becomes zero, but the energy absorbing member protruding inside the bumper armature is bent and deformed in the front-rear direction, and the vehicle body member is also bent and deformed in the front-rear direction. The dip stroke is substantially increased and the impact energy absorption effect is enhanced.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals given to the same parts as in the conventional structure.

In Figures 1 to 4, the bumper armature 2 disposed inside the bumper face layer 1 made of an elastic material is made of a fiber-reinforced resin material and has an approximately five-dimensional cross-section. Vehicle body member] At the part corresponding to the 0 end, there is a bracket part 6 on the upper and lower walls 3.4.
, 7 are integrally extended into a substantially trapezoidal planar shape that gradually narrows the rear edge side, and the flanges 6a and 7a at the edge of the bracket portion 6.7 are brought into contact with the flange Ila of the bumper bracket 11. The basic structure, such as the point where the bolt and nut 12 are connected in contact with each other, is the same as that of the prior art.

Here, an energy absorbing part (414) is disposed protrudingly arranged at the end of the vehicle body member 10, which protrudes into the bumper armature 2 and can be crushed and deformed by a collision input at the time of a vehicle collision. The energy absorbing member 14,
The metal panel material is formed into a rectangular closed cross-sectional structure, and the trailing edge flange 14a is connected to the flange 11a of the bumper bracket 11 with bolts and nuts I2, and is arranged to protrude coaxially with the vehicle body member 10. . A plurality of bent beads 15 are provided at the circumferential corner of this energy absorbing member I4.
are recessed so that when a collision input is applied from the front, these folded doors 15 are easily crushed and deformed in the front-rear direction starting from the starting point. In addition, a through bolt 16 is provided above the energy absorbing member 14 and passing through the F wall, so that when a collision input acts on the center portion of the bumper armature 2 and is transmitted to the energy absorbing member 14, a rectangular shape is provided. This is to prevent the closed cross-sectional shape from deforming into a diamond shape, so that not only the energy absorbing member 14 but also the vehicle body member 10 can be crushed and deformed smoothly in the front and rear directions. On the other hand, the bumper bracket! Above 1.

A protruding piece I8 serving as a breaking means 17 is connected to the lower part in a direction perpendicular to the rear edge of the bracket part 6.7. A recessed part 19 is formed at a portion of the rear edge of the bracket parts 6, 7 corresponding to the protruding piece 18, and a required gap g is set between the protruding piece 18 and the end of the protruding piece 18. Vehicle body member lO
Even if the bumper armature 2 is slightly bent and deformed in the front-rear direction at the end of the bracket part 6.7 due to the gap g.
This is done so that the end does not interfere with the protruding piece 18.

According to the structure of the embodiment described above, in the event of a light collision of a vehicle, the bumper armature 2 is slightly bent and deformed in the front and rear direction at the portion corresponding to the end of the vehicle body member 10, but the shape effect of the substantially U-shaped cross section As a result, this bending stroke in the longitudinal direction is slightly suppressed, and there is no interference between the edge of the recessed part 19 of the bracket part 6.7 and the protruding piece 18, and the required reaction force is generated at the attachment part to the end of the vehicle body member 10. arise. As a result, in the event of a light collision, elastic deformation of the central portion of the bumper armature is promoted, allowing the fiber-reinforced resin bumper armature to exhibit its inherent collision energy absorption performance.

During a high-speed collision of a vehicle, if the bumper armature 2 at the end of the vehicle body member 10 is bent and deformed in the longitudinal direction by more than the gap g dimension, and the edge of the recessed part 19 bites into the protrusion I8,
From this, cracks occur in the upper and lower walls 3.4 of the bumper armature 2, and due to the cracks, the bumper armature 2 does not retain its original shape and crashes. Due to this crushing, the yield strength of the bumper armature 2 becomes zero, but at approximately the same time, the energy absorbing member I4 protruding inwardly from the bumper armature 2 is bent and curved in the front-rear direction, and the vehicle body member IO is also crushed and deformed in the front-rear direction. Therefore, the dipping stroke of the I4i body member IO in the front-back direction is
The amount of protrusion of the energy absorbing member 14 is increased, and the impact energy absorbing effect can be improved.

In the embodiment shown in FIG. 4, the edge of the energy absorbing member 14 is effectively utilized as the breaking means 17. The energy absorbing member 4 is arranged with its flQ end edge close to the back surface of the front wall 5 of the bumper armature 2. On the other hand, on the back surface of the front wall 5, a recess 20 is formed at a position corresponding to the front edge of the bumper armature 14 and formed thin, and a required gap g is set between the front edge and the front edge of the energy absorbing member 14. This prevents the recess 20 from interfering with the front edge of the energy absorbing member 14 even if the bumper armature 2 is slightly bent in the front-rear direction during a light collision of the vehicle.

Therefore, in the case of this embodiment as well, in the event of a light collision, the rigidity of the attachment portion of the bumper armature 2 to the end of the vehicle body member 10 can be ensured, and the original collision energy absorption characteristics of the fiber-reinforced resin bumper armature can be exhibited. In the event of a high-speed collision, when the bumper armature 2 at the end of the vehicle body member 10 bends and strokes in the longitudinal direction beyond the gap g dimension, the thin portion of the front wall 5 interferes with the front edge of the energy absorber 14, causing cracks in the portion. This crack causes the bumper armature 2 to collapse without retaining its original shape, and the inner energy absorbing member 14 and the vehicle body menova 10 are smoothly crushed and deformed in the rear direction, resulting in a collision. It can exert energy absorption effect.

Effects of the Invention As described above, according to the present invention, in the event of a minor vehicle collision, the attachment strength of the bumper armature to the vehicle body member can be secured due to the shape effect of the approximately U-shaped cross section, and the inherent elastic deformation of the fiber-reinforced resin bumper armature can be ensured. It is possible to exhibit energy absorption characteristics due to In the event of a high-speed collision, the bumper armature is deflected in the longitudinal direction by a predetermined stroke or more, and the destruction means can crash the bumper armature without retaining its original shape. The armature does not remain as a rigid object and does not have a negative effect on the crushing mode of the vehicle body members. Moreover, at the same time as the bumper armature crashes, the energy absorber inside the bumper armature collapses and deforms in the front and rear directions, so the vehicle body This has the advantage that the collapse stroke of the member can be substantially increased and the impact energy absorption effect can be further improved.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a sectional view taken along line 11 in FIG. 2, and FIG.
The figures are cross-sectional views showing different examples of the present invention, FIG. 5 is an exploded perspective view showing a conventional structure, FIG. 6 is a plan view of the same, and FIG.
It is a sectional view taken along the line ■-■ in the figure. DESCRIPTION OF SYMBOLS 1...Bumper fence, 2...Bumper armature, 3...Upper wall, 4...Lower wall, 10...Vehicle body member, 14...Energy absorbing member, 17...Destruction means. Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] (1) A bumper armature placed inside the bumper fascia is formed with a fiber-reinforced resin material to have a substantially U-shaped cross section, and the upper and lower rear end edges of both sides of the bumper armature are fastened to the ends of the vehicle body members. In a fixed structure, an energy absorbing member that protrudes into the bumper armature and can be crushed and deformed by a collision input is provided at the end of the vehicle body member, and when the bumper armature is deflected in the longitudinal direction by a predetermined amount or more, A mounting structure for an automobile bumper, characterized in that it is provided with an armature breaking means that interferes with the armature to generate cracks.