JP2727201B2 - Car bumper structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bumper structure for an automobile, and more particularly to a structure of a synthetic resin bumper formed by blow molding.

(Prior Art) Recently, synthetic resin bumpers have been widely used as bumpers for automobiles. This synthetic resin bumper is
In general, since it is formed by blow molding, it can be easily formed even with a relatively complicated shape and has good moldability, and is lighter than a metal bumper. It also has excellent advantages.

And, for example, in Japanese Utility Model Laid-Open No. 58-194942,
A bumper made of a synthetic resin in which a concave portion having a step is formed by a hollow molding method (blow molding) is disclosed.

(Problems to be Solved by the Invention) By the way, the synthetic resin bumper formed into a hollow shape by blow molding as described above is superior to the metal bumper in terms of moldability and weight reduction of the vehicle body. Although it has advantages, it tends to be insufficient in rigidity and strength as compared with metal bumpers. Therefore, it has been an issue how to improve the rigidity and strength of a bumper made of this kind of synthetic resin.

Therefore, the present invention relates to a bumper made of a synthetic resin formed by blow molding, which tends to have a lower rigidity and strength than a metal bumper, and an automobile bumper capable of effectively improving the rigidity and strength of the bumper. The purpose is to provide a structure.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that it is configured as follows.

That is, the present invention relates to a synthetic resin bumper formed by blow molding, and has a cross-section formed by continuously forming a concave portion that is depressed toward the front side of the bumper on the rear surface of the bumper in the vehicle width direction. The shape is a closed cross section of a U-shape, and a second concave portion in which the concave portion is formed partly deep is provided at a predetermined interval in the vehicle width direction at one upper and lower stages, and the front end of the second concave portion is It is characterized in that it is surface bonded to the front part.

(Operation) According to the above configuration, a concave portion which is continuously depressed toward the front side of the bumper is formed on the rear surface of the synthetic resin bumper formed by blow molding so as to reduce the cross-sectional shape. Since the closed cross-section is formed in a V-shape, the rigidity and strength of the bumper are improved as compared with a simple hollow bumper whose cross-sectional shape is formed into a substantially rectangular shape by, for example, blow molding. In addition, a second concave portion in which the concave portion is formed partly deeper is provided in a vertical direction at predetermined intervals in the vehicle width direction, and the front end of the second concave portion is surface-bonded to the front surface of the bumper. Without the need for a member to join the front portion to the front portion, a structure in which the concave portion or the rear surface side is connected to the front portion can be obtained, and the second deep recess formed above and the concave portion that is continuous in the vehicle width direction are provided on the vehicle. The bumper has a complicated shape that is alternately continuous in the width direction, whereby the overall rigidity and strength of the bumper are effectively increased, and further improved.

Further, according to the present invention, since the bumper is formed by blow molding, even if the bumper has a complicated shape as described above, it can be formed relatively easily.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view of an automobile to which a bumper structure of the present invention is applied, and shows a front bumper 10 in a vehicle width direction below a pair of left and right headlamps 2, 2 mounted on a front portion 1 of the automobile. As shown in FIG. 2 to FIG. 4, the front bumper 10 is made of a synthetic resin and integrally formed by blow molding to form a core member of the front bumper 10;
And a cover member 12 formed of, for example, synthetic resin or the like, which covers the front and upper portions of the cover 11.

As shown in FIG. 3, the bumper main body 11 has a hollow cross-sectional shape having a hollow portion 13 and is continuous with a rear surface 11a of the bumper main body 11 in the vehicle width direction. Thus, a first concave portion 11c which is depressed toward the front surface 11b of the main body 11 is formed. As shown in FIG. 4, the first recess 11c (see FIG. 3) is partially formed deeper toward the front surface 11b, and the second recess 11c 'joined to the inner surface of the front surface 11b is formed. Is formed. In addition, the second
The hollow portion 13 (see FIG. 3) is divided into an upper hollow portion 13a and a lower hollow portion 13b by a concave portion 11c '. Therefore, as shown in FIG. 2, the cross-sectional shape of the bumper main body 11 in the vehicle width direction is such that the first concave portions 11c and the second concave portions 11c 'are alternately continuous in the vehicle width direction.

As shown in FIGS. 2 and 4, the bumper main body 11 having the above-described cross-sectional shape is supported at both ends thereof by a pair of left and right bumper mounting brackets 14 and 14. The brackets 14, 14 are joined to the front ends of a pair of left and right front frames 15, 15 disposed at predetermined positions in the vehicle width direction in the front-rear direction of the vehicle body, and between the front ends of these front frames 15, 15. Shroud panel 17 reinforced by cross members 16 arranged in different directions
Are fixed at predetermined positions in the vehicle width direction on the front surface of the bumper main body 11, and the second concave portions 11 c ′ and 11 c
It is disposed in the bumper main body 11 so as to be located behind c '. Therefore, as shown in FIG. 4, the upper surface 11d and the lower surface 11e of the bumper main body 11 are fixed to the upper and lower portions of the bumper mounting brackets 14, 14 by a plurality of fixing members 18, respectively. As shown in FIG. 2, the bumper main body 11 is attached to the vehicle body at the front part of the vehicle body.

As shown in FIG. 3, the cover member 12 and the bumper body 11 are integrally attached by a fastener member 19 inserted from above the cover member 12. Note that a plurality of the fastener members 19 are provided at predetermined intervals in the vehicle width direction.

In addition, as shown in FIGS.
A fin portion 11b 'extending downward from the front surface 11b is integrally provided below the front surface 11b on both sides of the cover member 12 so that when a load acts on the cover member 12 from the front, the cover The lower surface 12a of the member 12 is
The contact with 1b 'reliably prevents the cover member 12 from being extremely deformed toward the rear of the vehicle body. As shown in FIGS. 1 and 3, an air introduction hole 12b is formed at the center of the front surface of the cover body 12.

FIG. 5 is an overall front view of the rear bumper to which the bumper structure according to the present embodiment is applied, as viewed from the rear side of the vehicle body.
Similarly to FIG. 10, as shown in FIGS. 6 to 8, a synthetic resin bumper main body 21 integrally formed by blow molding to form a core member of the rear bumper 20, and a front part and an upper part of the bumper main body 21 are formed. And a cover member 22 formed of, for example, a synthetic resin.

As shown in FIG. 7, the bumper main body 21 has a hollow cross-sectional shape having a hollow portion 23 and is continuous with a rear surface 21a of the main body 21 in the vehicle width direction. The first recess 2 which is depressed toward the front surface 21b of the main body 21
1c is formed. As shown in FIG. 8, the first concave portion 21c (see FIG. 7) is partially formed deeper toward the front surface 21b, and is joined to the inner surface of the front surface 21b.
A recess 21c 'is formed. Further, the second hollow portion 21c 'allows the hollow portion 23 (see FIG. 7) to be connected to the upper hollow portion 23a.
And a lower hollow portion 23b. Therefore, as shown in FIG. 6, the cross-sectional shape of the bumper main body 21 in the vehicle width direction is such that the first concave portions 21c and the second concave portions 21c 'are alternately continuous in the vehicle width direction.

As shown in FIGS. 6 and 8, the bumper main body 21 having the above-mentioned cross-sectional shape is supported at both ends by a pair of left and right bumper mounting brackets 24, 24. 24, 24 are joined to the front end brackets of a pair of left and right rear frames 25, 25 disposed in the vehicle front-rear direction at predetermined positions in the vehicle width direction, and the vehicle width between the front ends of these rear frames 25, 25 Are fixed at predetermined positions in the vehicle width direction on the front portion of the rear end panel 27 reinforced by the cross members 26 arranged in the direction, so that the second concave portions 21c 'and 21c at both ends of the bumper main body 21 are provided. ′ Is disposed in the bumper main body 21 so as to be located behind. Therefore, as shown in FIG. 8, the upper surface 21d and the rear surface 21a of the bumper main body 21 are fixed by a plurality of fixing members 28... 28 below the upper surface portions of the respective bumper mounting brackets 24, 24 and below the rear end panel 27. As a result, the bumper main body 21 is attached to the vehicle body rearward of the vehicle body, as shown in FIG.

As shown in FIG. 7, the cover member 22 and the bumper body 21 are integrally attached by fastener members 29, 29 inserted from above and behind the cover member 22. Note that the fastener member 29 is a fifth member.
As shown in the figure, a plurality are provided at predetermined intervals in the vehicle width direction.

In this embodiment, the front bumper 10
And the rear bumper 20 is composed of the bumper bodies 11, 21 and the cover members 12, 22, respectively.
Front bumper 10 and rear bumper 2 only from 1, 21
It is also possible to form 0.

According to the above configuration, the front surfaces 11b, 21b of the front and rear bumpers 11 and 21, respectively, of the synthetic resin front bumper 10 and the rear bumper 20 formed by blow molding are continuously connected to the rear surfaces 11a, 21a in the vehicle width direction. By forming the first concave portions 11c and 21c that are depressed toward the side, for example, the bumper main body 11 is compared with a simple hollow bumper whose cross-sectional shape is formed into a substantially square shape by blow molding.
The rigidity and strength of 21 will be improved. In addition, the first recesses 11c and 21c are partially formed deeply, and
Second concave portions 11c ', 21c' joined to front surfaces 11b, 21b of 11, 21
Is formed, the deeply formed second
The recesses 11c ', 21c' and the first recesses 11c, 21c are second,
As shown in FIG. 6, the bumper main bodies 11 and 21 are effectively increased in rigidity and strength as a whole and have a complicated shape that is alternately continuous in the vehicle width direction.

Further, according to the present invention, since the bumper bodies 11, 21 are formed by blow molding, even if the shapes of the bumper bodies 11, 21 are complicated as described above, they can be formed relatively easily. can do.

Further, as shown in FIGS. 2, 4 and 6, 8, each bumper mounting bracket 1 for mounting the front bumper main body 11 and the rear bumper main body 21 on the vehicle body side.
4, 14 and 24, 24 are arranged in the bumper bodies 11, 21, respectively.
When attaching 11 and 21 to the vehicle body, the bumper body 1
1, 21 can be mounted close to the vehicle body side, so that if the front bumper 10 is
The feeling of unity with the vehicle body at the time of mounting is increased, and the appearance can be further improved.

(Effect of the Invention) As described above, according to the bumper structure for an automobile according to the present invention, the rear surface of the synthetic resin bumper formed by blow molding is continuously connected to the front side of the bumper in the vehicle width direction. By forming a depressed concave portion to make the cross-sectional shape a U-shaped closed cross-section, for example, compared to a simple hollow bumper whose cross-sectional shape is formed into a substantially rectangular shape by blow molding, the rigidity of the bumper is improved. The strength will be improved.
In addition, the second concave portion in which the concave portion is formed partly deeper is provided in a vertical direction at predetermined intervals in the vehicle width direction, and the front end of the second concave portion is surface-joined to the front surface of the bumper. A structure in which the concave portion or the rear surface side is connected to the front portion can be obtained without requiring a member for joining the concave portion to the front portion, and the second concave portion formed deeply and the concave portion continuous in the vehicle width direction are obtained. The bumper has a complicated shape that is alternately continuous in the vehicle width direction, whereby the rigidity and strength of the entire bumper are effectively increased, and further improved.

Further, according to the present invention, since the bumper is formed by blow molding, even if the bumper has a complicated shape as described above, it can be formed relatively easily.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a schematic front view of an automobile to which a bumper structure of the automobile according to the embodiment is applied, and FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view of a front bumper to which a vehicle bumper structure according to the present embodiment is applied, and FIGS. 3 and 4 are enlarged cross-sectional views of main parts of the front bumper taken along the line III-III and the line IV-IV in FIG. 1, respectively. FIG. 5 is an overall front view of the rear bumper to which the automobile bumper structure according to the embodiment is applied, as viewed from the rear side of the vehicle body. FIG. 6 is a cross-sectional view of the rear bumper as viewed from a cutting line VI-VI in FIG. FIGS. 7 and 8 are enlarged cross-sectional views of the main part of the rear bumper, respectively, as viewed along the cutting lines VII-VII and VIII-VIII in FIG. 10, 20… bumper (front bumper, rear bumper), 11, 21… bumper body, 11a, 21a… rear face, 11
b, 21b front face, 11c, 21c recess (first recess), 11
c ', 21c'... A part (second concave part) formed deep in the concave part.

Claims (1)

(57) [Claims] In a bumper made of a synthetic resin formed by blow molding, a concave portion is formed in a rear surface of the bumper continuously in a vehicle width direction and is depressed toward a front side of the bumper so as to have a cross-sectional shape. A second concave portion having a U-shaped closed cross section and a partially deepened concave portion is provided in a vertical direction at predetermined intervals in the vehicle width direction, and a front end of the second concave portion is provided on a front portion of the bumper. A car bumper structure characterized by surface bonding.