JPS62110545A - Automobile bumper - Google Patents

Abstract

PURPOSE:To obtain good recovery of a facsia of a bumper having horizontal surfaces connected by bolts to an armature connected to the vehicle body when bumping by forming boltholes of a T-shaped configuration in the facsia. CONSTITUTION:A bumper B is composed of an armature 1 having inside and outside panels 4, 2 and being of a box section, a facsia 6, and an energy absorber 10 charged in the space 12 defined between the members 1 and 6, and it is mounted to the vehicle body through a stay 14. The facsia 6 has upper and lower surface portions 6a fastened by bolts 16 through retainers 7 to the outside panel 2 of the armature 1. In this case, the bolts 16 are shoulder bolts, and through holes 18 through which the shoulder bolts 16 of the facsia 6 extend are formed in a T-shaped having a front portion 18a extending along the vehicle width and a rear portion 18b extending rearwardly from the center of the front portion. This provides good recovery of the facsia 6 after an impact force acts on the bumper.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a bumper for an automobile.

[Prior art]

The construction of the conventional automobile chassis (I'1) is described in detail in the Sankaido Edition Automotive Engineering Complete Book, Volume 13, "Passenger Car Body." This is shown in Figures 5 and 6. Reference numeral 6 indicates an armature which is a strength member formed into a box-shaped vertical section by the outer panel 2 and the inner panel 4, and 6 indicates a resin fascia, which is bolted to the armature 1 via a retainer 7 at its upper and lower horizontal plane parts 6a, 6a. 8 is fastened and attached. 10 is an energy absorber such as a resin foam loaded in the space 12 between the armature 1 and the fascia 6, and 14 is fixed to the inner panel 4 of the armature I. , a stay bolted to the vehicle body (not shown); 15 is the fascia 6;
This is an insertion hole for the bolt 8 drilled in, and is a long hole extending in the vehicle width direction.

Thus, when a vehicle crashes, the collision load is absorbed by the fascia 6 and the energy absorber 10.

[Problem that the invention seeks to solve]

However, when such an automobile bumper collides at the solid line position in FIG.
0 tries to restore itself due to its elasticity, but the armature 1 and stay 14 remain in a deformed state and do not return to their original positions, so the integrated fascia 6 follows this through the armature 1 and bolt 8. It remains deformed, and on the other hand, since the end of the bumper side BS is screwed around the wheel opening of the fender F, the fascia 6 is wrinkled and swells greatly at the bumper side BS, as shown in Figure 7, impairing the appearance quality. There was a problem.

The present invention has been made by focusing on such conventional problems, and an object of the present invention is to provide an automobile bumper in which the fascia is restored and the appearance quality is not impaired even when the bumper is deformed due to impact. With the goal.

[Means for solving problems]

In order to achieve such an object, the present invention provides an automobile bumper in which a fascia is bolted to an armature at its horizontal surface, and the armature is connected to the vehicle body via a stay, in which the bolts are connected to a wall thickness of the horizontal surface of the fascia. While the stepped bolts have roughly the same neck length, the front part of the insertion hole under the bolt neck of the fascia is formed into a long hole that extends in the vehicle width direction, and the rear part forms a T-shape with the front part and extends in the front and rear direction. The fascia is bolted to the armature with the lower part of the bolt neck inserted through the front part of the insertion hole, so that the fascia can be restored independently after a collision.

〔Example〕

In FIGS. 1 to 4, parts that are the same as the conventional ones are given the same reference numerals, and the bumper B has an armature 1 that is formed into a box-shaped vertical cross section by an outer panel 2 and an inner panel 4.
, a fascia 6, an energy absorber 10 made of resin foam or the like loaded in a space 12 between the armature 1 and the fascia 6, and an energy absorber 10 fixed to the inner panel 4 of the armature 1 and bolted to the vehicle body (not shown). It consists of 14 stays.

The fascia 6 is fastened to the outer panel 2 of the armature 1 at its upper and lower horizontal plane portions 6a, 6a via a retainer 7 with bolts 16.

The bolt 16 is attached to the horizontal surface portion 6 of the fascia 6.
The stepped bolt has a lower neck 16a that is approximately the same as the wall thickness of the stepped bolt 16a, and the insertion hole 18 through which the lower neck 16a of the stepped bolt 16 of the fascia 6 is inserted has a length such that the front portion 18a extends in the vehicle width direction. The rear part 18b is formed in a hole and the rear part 18b is T with the front part 18a.
The lower neck 16a of the stepped bolt 16 is formed in a long hole that forms a letter shape and extends in the front-rear direction, and the lower neck 16a of the stepped bolt 16 is inserted into the front part 18a of the insertion hole 18.
The fascia 6 is fastened to the armature 1 with stepped bolts 16 while being inserted through the fascia 6 .

Next, the action will be explained.

FIGS. 3(A) and 4(A) show the normal mounting state of the bumper B.

In such a state, an impact force F0 is applied to the bumper B during a vehicle collision.
When this happens, the collision energy is absorbed by the fascia 6 and the energy absorber 10, and the armature 1
is retracted by a stroke l and deformed as shown in FIG. 3(b). At this time, the fascia 6 also deforms backward as shown in FIG. 4(c), and the bumper side to which the terminal is fixed swells greatly.

However, after the collision, the fascia 6 returns to its original shape due to the elastic reaction force F1, and assumes the position shown in FIGS. 3(B) and 4(B). This is because the end of the bumper side of the fascia 6 is fixed to the vehicle body, and the fascia 6 is fastened to the armature 1 with a stepped bolt 16, making the coupling force loose. Rear part 1 of insertion hole 18 through which 16a is inserted
8b is a long hole extending in the front-rear direction, and the fascia 6
This is because the armature 1 is slidable in the front and rear directions with respect to the armature 1.

Thus, if the fascia 6 returns to its pre-collision shape,
The bulge on the bumper side also disappears, and no deformation remains that would impair the appearance quality.

Moreover, since the insertion hole 18 of the stepped bolt 16 is T-shaped, installation adjustment is possible even if the fascia 6 is formed slightly longer.

〔effect〕

As described above, according to the present invention, even if the armature is deformed when the bumper receives an impact due to a vehicle collision or the like, the fascia is restored and the appearance quality is not impaired.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the main parts of the automobile bumper of the present invention, and FIG.
The figure is a vertical side view in the assembled state, Figure 3 (a),
(b) is an explanatory diagram of the action corresponding to the part surrounded by 9■ in Fig. 2, Fig. 4 (a), (b), and (c) are explanatory diagrams of the action, respectively, and Fig. 5 is the conventional one for automobiles. FIG. 6 is an exploded perspective view of essential parts of the damper, and FIG. 7 is an explanatory perspective view showing the problem. 1... Armature, 6... Fascia, 6a... Horizontal surface part, 14... Stay, 16... Stepped bolt, 16a.・・・・・・
Lower neck, 18...Insertion hole, 18a...Front, 18K 1Ω Photo 2 note 3α (A) Note 50 Calculation C note l? play

Claims (1)

[Claims] In an automobile bumper in which a fascia is bolted to an armature at its horizontal surface, and the armature is connected to the vehicle body via a stay, the bolt is a stepped bolt having a neck length approximately equal to the thickness of the horizontal surface of the fascia. On the other hand, the front part of the insertion hole under the bolt neck of the fascia is formed into a long hole extending in the vehicle width direction, and the rear part forms a T-shape with the front part and is formed into a long hole extending in the front-rear direction. A bumper for an automobile, characterized in that the fascia is bolted to the armature with the lower part inserted through the front part of the insertion hole.