JP2002087186A - Bumper beam for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bumper beam for automobile formed in a tubular structural body without requiring a welding process and having an impact resistance. SOLUTION: This bumper beam 1 comprises a front piece 1a, an upper piece 1d connected to the upper end of the front piece 1a, an upper intermediate piece 1e positioned on the lower side of the upper piece 1d, an upper side joint piece 1f connecting the rear end of the upper piece 1d to the rear end of the upper intermediate piece 1e, a lower piece 1g connected to the lower end part of the front piece 1a, a lower intermediate piece 1h positioned on the upper side of the lower piece 1g, and a lower side joint piece 1i connecting the rear end of the lower piece 1g to the rear end of the lower intermediate piece 1h. Recessed parts 3 and 3 and projected parts 4 and 4 are formed repeatedly in the front end of the upper intermediate piece 1e and on the front end of the lower intermediate piece 1h, drilled holes 5 and 5 for inserting the projected parts 4 and 4 therein are provided in the front piece 1a, and the tip sides of the projected parts 4 and 4 are bent so as to be locked to the front side of the front piece 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper beam for an automobile, which protects an automobile body from an impact when a collision occurs.

[0002]

2. Description of the Related Art Conventionally, as this kind of automobile bumper beam, for example, there has been a bumper beam 20 as shown in FIG. FIG. 11 shows a cross section orthogonal to the longitudinal direction of the bumper beam 20. The bumper beam 20 includes a front piece 20a, an upper piece 20b, and a lower piece 2
0c, and an upper intermediate piece 20d and a lower intermediate piece 20e are provided between the upper piece 20b and the lower piece 20c. The front end of the upper intermediate piece 20d and the front end of the lower intermediate piece 20e are connected by an intermediate connecting piece 20f, and the rear end of the upper piece 20b and the rear end of the upper intermediate piece 20d are , The upper connecting piece 20g, the rear end of the lower piece 20c and the lower intermediate piece 20g.
e was connected to the rear end by the lower connecting piece 20h. Then, the bumper beam 20 is formed by sequentially bending the plate-shaped member by roll forming, and welding both ends of the plate-shaped member that abuts at substantially the center in the vertical direction of the front piece 20a downstream of the roll forming process. Thus, a tubular structure was manufactured as described above.

[0003]

However, the conventional bumper beam for an automobile requires a welding process, and a welded portion 21 made of a deposited metal is formed at a welded portion. Post-processing such as deburring after welding was required. As a result, the number of steps has been increased, which has led to an increase in manufacturing costs. On the other hand, if the bumper beam 20 is manufactured without any ingenuity and without performing the welding process, it is difficult to secure the impact resistance that the bumper device for a vehicle must have originally. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages, and an object of the present invention is to provide an automobile which is formed in a tubular structure without requiring a welding step and which has impact resistance. A bumper beam for the vehicle.

[0005]

An automobile bumper beam according to the present invention has the following configuration to achieve the above object. That is, the bumper beam for an automobile according to the first aspect of the invention is a bumper beam that is attached to the front side or the back side of the automobile and that is elongated in the left and right directions. The bumper beam includes a front piece forming a front surface, an upper body extending rearward from an upper side of the front piece, and a lower body extending rearward from a lower side of the front piece.
The upper body forms an upper surface and connects to an upper end of the front piece, an upper intermediate piece positioned below the upper piece and opposed to the upper piece, It has an upper connecting piece that connects the rear end and the rear end of the upper intermediate piece. On the other hand, the lower body forms a lower surface and is connected to a lower end of the front piece, a lower intermediate piece located above the lower piece and opposed to the lower piece, And a lower connecting piece that connects the rear end of the lower intermediate piece to the rear end of the lower intermediate piece. Here, at each of the front end of the upper intermediate piece and the front end of the lower intermediate piece, a concave part and a convex part are repeatedly formed, and the front part has a perforation through which the convex part is inserted. It is provided, and the tip side of the convex part is bent so as to be locked on the front side of the front piece.

Accordingly, the bumper beam is a tubular structure having a closed cross-sectional shape which is capable of dispersing or absorbing an impact at the time of an automobile collision and whose cross-section orthogonal to the longitudinal direction is divided into two upper and lower parts. Is formed as In addition, the bumper beam has a tubular structure without the need for a welding process, since the convex portions are inserted into the perforations, and the distal ends of these convex portions are bent so as to be locked on the front side of the front piece. The integrity as a body can be secured.

At this time, the perforations are provided in the upper perforations through which the protrusions provided in the upper intermediate piece are inserted and in the lower intermediate pieces, like the bumper beam for an automobile according to the second aspect of the present invention. A convex portion may be inserted, the upper hole may be composed of a lower hole independent of the upper hole, or as in the automobile bumper beam according to the invention according to claim 4, the upper intermediate piece may be provided with a lower hole. The projection provided on the lower intermediate piece and the projection provided on the lower intermediate piece may be formed by a common hole through which the projection is inserted. In this way, the convex portion provided on the upper intermediate piece and the convex portion provided on the lower intermediate piece may be separately inserted into the perforation, or may be inserted together into the perforation. You may.

Further, as in the automobile bumper beam according to the third aspect of the present invention, the upper perforations and the lower perforations are provided so as to be located alternately along the longitudinal direction of the front piece. It is preferable that at least one of the upper perforation and the lower perforation is disposed in a cross section orthogonal to the longitudinal direction at an arbitrary position in the longitudinal direction. Accordingly, the bumper beam has a fastening portion that is bent so that the front end side of the projection is locked to the front side of the front piece, regardless of the cross section of the bumper beam at any cross section perpendicular to the longitudinal direction. It becomes substantially uniform, and stress concentration at the time of deformation when a vehicle collides can be avoided.

According to a fifth aspect of the present invention, there is provided a bumper beam for an automobile, which is attached to a front side or a rear side of the automobile, and is a left and right longitudinal bumper beam. A front piece comprising a piece and a lower front piece forming a lower side; an upper body extending rearward of the upper front piece; a lower body extending rearward of the lower front piece; And an intermediate connecting piece for connecting the body and the lower body. The upper body forms an upper surface and is connected to an upper end of the upper front piece. The upper body is located below the upper piece and is opposed to the upper piece, and the front end has the intermediate piece. It has an upper intermediate piece connected to the upper end of the connecting piece, and an upper connecting piece connecting the rear end of the upper piece and the rear end of the upper intermediate piece. On the other hand, the lower body forms a lower surface and a lower piece connected to the lower end of the lower front piece, and is positioned above the lower piece and opposed to the lower piece, and at the front end, It has a lower intermediate piece connected to the lower end of the intermediate connecting piece, and a lower connecting piece connecting the rear end of the lower piece and the rear end of the lower intermediate piece. Here, at each of the lower end of the upper front piece and the upper end of the lower front piece, a concave portion and a convex portion are repeatedly formed, and the convex portion is inserted into the intermediate connecting piece. A perforation is provided, and a distal end side of the convex portion is bent so as to be locked to a rear surface side of the intermediate connecting piece.

[0010] In this way, the bumper beam can absorb or disperse the impact at the time of the collision of the vehicle,
The cross-sectional shape orthogonal to the longitudinal direction is formed as a tubular structure having a closed cross-sectional shape that is divided into upper and lower portions. In addition, the bumper beam is not required to be subjected to a welding process because the convex portions are inserted into the perforations and the front ends of these convex portions are bent so as to be locked on the rear surface side of the intermediate connecting piece. Formed as a tubular structure.

[0011] At this time, the perforations are formed by a projection provided on the upper front piece and a projection provided on the lower front piece, as in the automobile bumper beam according to the invention of claim 6. It preferably consists of a shared perforation to be inserted. As described above, the convex portion provided on the upper front piece and the convex portion provided on the lower front piece are preferably inserted together into the perforation.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an automobile bumper beam according to an embodiment of the present invention.

FIGS. 1 to 3 show a first embodiment of an automobile bumper beam according to the present invention. Reference numeral 1 in the drawing denotes an automobile bumper beam. The bumper beam 1 is a structure disposed inside the bumper face of the bumper, and is elongated in the left and right directions and is mounted on the front side or the rear side of the vehicle. Has a role to protect the main body. Reference numeral 2 denotes a side frame as a support member that supports the left and right sides of the bumper beam 1. Thus, the bumper beam 1 is attached to the vehicle body via the side frames 2 and 2.

Here, the bumper beam 1 is made of a plate-like member and has a plate-like front piece 1a forming a front surface thereof, an upper body 1b extending rearward from an upper side of the front piece 1a, and an upper body 1b. A lower body 1c is provided which extends rearward from the lower side of the front piece 1a apart from the body 1b. Furthermore, upper body 1b
Is a plate-shaped upper piece 1d which forms the upper surface of the bumper beam 1 and is connected to the upper end of the front piece 1a, and a plate-shaped upper piece 1d located below the upper piece 1d and opposed to the upper piece 1d. An upper intermediate piece 1e, a plate-shaped upper connecting piece 1 for connecting a rear end of the upper piece 1d and a rear end of the upper intermediate piece 1e.
f. Similarly, the lower body 1c forms a lower surface of the bumper beam 1 and has a plate-shaped lower piece 1g connected to the lower end of the front piece 1a, and a lower piece 1g located above the lower piece 1g. And a plate-shaped lower connecting piece 1i connecting the rear end of the lower piece 1g and the rear end of the lower intermediate piece 1h.
The upper intermediate piece 1e and the lower intermediate piece 1h are formed so as to have a tapered vertical cross-section approaching each other toward the front, and the front piece 1a is formed in the middle of the upper part in the vertical direction. Upper step portion 1j slightly extending rearward
A lower step portion 1k slightly extending rearward in the vertical direction on the lower side thereof, and an intermediate portion 1r connected to the rear end of the upper step portion 1j and the rear end of the lower step portion 1k. ing.

At the front end of the upper intermediate piece 1e and the front end of the lower intermediate piece 1h, a plurality of concave portions 3, 3 and convex portions 4, 4 are repeatedly formed. Is provided with a plurality of perforations 5, 5 through which the protrusions 4, 4 are inserted, and the distal ends of the protrusions 4, 4 are bent so as to be engaged with the front side of the front piece 1a. . Also, the recess 3,
Reference numeral 3 is arranged so as to substantially abut or be close to the rear surface side of the intermediate portion 1r of the front piece 1a. And
The upper holes 5a, 5a into which the projections 4, 4 provided in the upper intermediate piece 1e are inserted and the upper holes 5, 4 provided in the lower intermediate piece 1h are inserted. And upper holes 5a, 5a and lower holes 5b, 5b, each of which is, for example, a long hole extending in the left-right direction, and is formed in the middle portion 1 of the front piece 1a.
r are provided at regular intervals along the longitudinal direction. Furthermore, upper perforations 5a, 5a and lower perforations 5b,
5b are provided so as to be staggered along the longitudinal direction of the front piece 1a, and at any position in the longitudinal direction, a cross section orthogonal to the longitudinal direction has at least one of an upper hole and a lower hole. One or the other is arranged. As a result, the bumper beam 1 has a fastening portion that is bent so that the tip sides of the protrusions 4 and 4 are locked to the front side of the front piece 1a regardless of the cross section perpendicular to the longitudinal direction. As a result, since the sectional rigidity becomes substantially uniform, there is an advantage that stress concentration at the time of deformation when a vehicle collides can be avoided.

Further, the bumper beam 1 is formed as a tubular structure having a closed cross-sectional shape in which the cross-sectional shape orthogonal to the longitudinal direction is divided into upper and lower parts, thereby dispersing an impact when an automobile collides. It becomes possible to absorb.
The bumper beam 1 is bent so that the projections 4, 4 are inserted into the perforations 5, 5, and the distal ends of the projections 4, 4 are locked to the front side of the front piece 1a. This ensures the integrity of the tubular structure, thereby eliminating the need for a welding step and forming the closed cross-sectional shape. Therefore, the welding step conventionally required can be omitted, and the manufacturing cost is reduced.

FIGS. 4 and 5 show a second embodiment of an automobile bumper beam according to the present invention. In the second embodiment, as compared with the first embodiment, the lower surface of the upper intermediate piece 1e and the upper surface of the lower intermediate piece 1h are almost in surface contact with each other, and the protrusion provided on the upper intermediate piece 1e. Part 4,
4 is different from that of FIG. 1 in that the projections 4 and 4 provided on the lower intermediate piece 1h are inserted into the same perforations 5 and 5, but the others are the same.
That is, the perforations 5, 5 provided in the front piece 1a of the bumper beam 1 are provided with the protrusions 4, 4 provided in the upper intermediate piece 1e.
And the protruding portions 4 and 4 provided on the lower intermediate piece 1h are formed with common holes 5c and 5c, respectively.
5c is, for example, a front piece 1a as a long hole extending left and right.
Are provided in a line at regular intervals along the longitudinal direction. The recesses 3, 3 are
It is arranged so as to substantially abut or be close to the rear surface side of the intermediate portion 1r of FIG. 5A (see FIG. 5). Thus,
Also in the second embodiment, the bumper beam 1 is formed in a tubular structure having a closed cross-sectional shape in which the cross-sectional shape orthogonal to the longitudinal direction is divided into upper and lower portions, so that the bumper beam 1 when the vehicle collides is The impact can be dispersed or absorbed. The bumper beam 1 is bent by inserting the projections 4 and 4 into the perforations 5 and 5 and bending the front ends of the projections 4 and 4 to be engaged with the front side of the front piece 1a. By eliminating the need for a welding step, the integrity of the tubular structure can be ensured. Therefore, the manufacturing cost is reduced by omitting the welding process.

FIGS. 6 and 7 show a third embodiment of the bumper beam for an automobile according to the present invention. The third embodiment is greatly different from the first and second embodiments in that the insertion directions of the projections 4 and 4 inserted into the perforations 5 and 5 are opposite to those of the first and second embodiments. That is, the bumper beam 1 has a front piece 1 consisting of a plate-shaped upper front piece 1m forming the upper side and a plate-shaped lower front piece 1n forming the lower side.
a, an upper body 1b extending rearward of the upper front piece 1m, a lower body 1c extending rearward of the lower front piece 1n, and an upper body 1b
And a plate-shaped intermediate connecting piece 1p connecting the lower body 1c and the lower body 1c. Further, the upper body 1b forms an upper surface of the bumper beam 1 and has a plate-shaped upper piece 1d connected to the upper end of the upper front piece 1m, and a lower piece 1d positioned below the upper piece 1d. A plate-shaped upper intermediate piece 1e connected to the upper end of the intermediate connecting piece 1p at the front end and a plate-shaped upper end connected to the rear end of the upper piece 1d and the rear end of the upper intermediate piece 1e. It consists of an upper connecting piece 1f. Similarly, the lower body 1c forms a lower surface of the bumper beam 1 and has a plate-like lower piece 1g connected to the lower end of the lower front piece 1n. A plate-like lower intermediate piece 1h that is opposed to the piece 1g and that is connected to the lower end of the intermediate connecting piece 1p at the front end;
It comprises a plate-shaped lower connecting piece 1i connecting the rear end of the lower piece 1g and the rear end of the lower intermediate piece 1h. The upper intermediate piece 1e and the lower intermediate piece 1h are formed so as to have a tapered vertical cross-section approaching each other as going forward.

At the lower end of the upper front piece 1m and the upper end of the lower front piece 1n, a plurality of concave portions 3, 3 and convex portions 4, 4 are repeatedly formed. 1
p is provided with a plurality of perforations 5, 5 through which the protrusions 4, 4 are inserted.
It is bent so as to be locked to the rear surface side (see FIG. 6). In the illustrated embodiment, the upper front piece 1
m and the recesses 3 and 3 provided in the lower front piece 1n are arranged so as to face each other and to be close to each other (see FIG. 7). The perforations 5, 5 are composed of common perforations 5c, 5c into which the convex portions 4, 4 provided on the upper front piece 1m and the convex portions 4, 4 provided on the lower front piece 1n are inserted. The perforations 5c, 5c are provided, for example, as long holes extending in the left and right directions, at a substantially central portion in the vertical direction of the intermediate connecting piece 1p in a line at a constant interval along the longitudinal direction. As described above, similarly to the first and second embodiments, the bumper beam 1 has two upper and lower cross-sectional shapes orthogonal to the longitudinal direction, which can disperse or absorb the impact when the vehicle collides. It is formed as a tubular structure having a closed cross-sectional shape divided into two. Then, the bumper beam 1 is bent such that the convex portions 4, 4 are inserted into the perforations 5, 5, and the distal ends of the convex portions 4, 4 are locked to the rear surface side of the intermediate connecting piece 1p. By that
The tubular structure having the closed cross section is formed without the need for a welding step. Therefore, the manufacturing cost can be reduced by omitting the welding process.

Next, in the bumper beam according to the present invention,
The manufacturing method according to the first embodiment will be described with reference to FIGS. Note that the second and third embodiments can be manufactured in the same manner as in the manufacturing method of the first embodiment.

The bumper beam 1 has a plurality of concave portions 3 and 3 and a plurality of convex portions 4 and 4 formed at both ends in the longitudinal direction, and a plurality of perforations 5 and 5 through which the convex portions 4 and 4 are inserted. Is sequentially bent by roll forming, and the projections 4, 4 are inserted into the corresponding holes 5, 5, and the projections 4, 4 are formed.
Is bent so as to be locked to the substrate main body 6a, that is, as a tubular structure having a closed cross-sectional shape in which the cross-sectional shape orthogonal to the longitudinal direction is divided into upper and lower portions by so-called bending. As shown in FIG. 8, a substrate 6 for manufacturing the bumper beam 1 is made of, for example, a substrate body 6a made of aluminum as a plate-like member. A plurality of recesses 3 and 3 and protrusions 4 and 4 are repeatedly formed at intervals, and a long hole-like shape is provided substantially at the center in the width direction of the substrate main body 6a. Are provided with a plurality of upper and lower perforations 5,5. The concave portions 3, 3 and the convex portions 4, 4 formed on either one of the two side ends of the substrate body 6 a are provided with the concave portions 3, 3, the convex portions 4, 4, 4 The perforations 5, 5 into which the protrusions 4, 4 provided on the upper intermediate piece 1e are inserted become upper perforations 5a, 5a, and a recess formed on one of the two side ends of the substrate body 6a. 3, 3 and the projections 4, 4 are the bumper beams 1
, The concave portions 3 and 3 and the convex portions 4 and 4 provided on the lower intermediate piece 1h.
The holes into which the holes 4 are inserted are lower holes 5b and 5b. In the illustrated embodiment, the substrate 6 has a perforation 5d opening at the front end and / or the rear end in the longitudinal direction of the substrate main body 6a.
Is provided, but of course, it may be closed.

Here, the substrate 6 enters a roll forming machine (not shown) and flows between rollers, so that it is sequentially bent in the width direction thereof. At this time, it is preferable that the upper body 1b and the lower body 1c of the bumper beam 1 are formed at the same time for reasons such as shortening the entire length of the production line. Then, as shown in FIG. 9, on the downstream side of the roll forming process, the front piece 1a, the upper piece 1d (the lower piece 1g), and the upper connecting piece 1f of the bumper beam 1.
The respective shapes of the (lower connecting piece 1i) and the upper intermediate piece 1e (lower intermediate piece 1h) are formed, and the convex portions 4, 4 provided on the upper intermediate piece 1e (lower intermediate piece 1h) are
The stage is about to be inserted into the upper hole 5a (lower hole 5b). Furthermore, in the continuous flow of roll forming,
The projections 4, 4 are inserted into the perforations 5, 5, and the distal ends of the projections 4, 4 are bent so as to be locked on the front side of the front piece 1 a, that is, bent and swaged, Is formed. After that, the bumper beam 1 is completed by cutting into a product length. The overall shape of the bumper beam 1 may not be formed to extend straight right and left, but may be curved by performing a radius bending process as shown in FIG. 11, for example. Thus, the bumper beam 1
Production can be carried out on a continuous production line for roll forming, and the welding process, which was conventionally required after the roll forming process, can be omitted, so that the production cost can be reduced and the time required for production can be shortened. Are achieved, and the productivity is improved. However, the method of manufacturing the bumper beam 1 may be, for example, press forming, instead of roll forming, depending on the purpose of use and other various circumstances. Press forming does not change the fact that the bumper beam 1 can be manufactured by omitting the welding step.

FIG. 10 shows a substrate 6 for manufacturing the bumper balm 1 shown in the second and third embodiments of the automotive bumper beam according to the present invention by roll forming. The substrate 6 is formed repeatedly at regular intervals on both sides of the substrate body 6a, and a plurality of recesses 3 formed symmetrically with respect to the center in the width direction of the substrate body 6a. , 3 and protrusions 4, and a plurality of elongated holes 5, 5 formed in a line in the longitudinal direction at substantially the center in the width direction of the substrate body 6 a. Then, when the substrate 6 is sequentially folded in the width direction by roll forming, the respective convex portions 4, 4 on both side end sides, which are in the symmetrical relationship, are provided.
Are inserted into the same perforations 5, 5, and thus the perforations 5, 5 in this case are shared perforations 5c, 5c. Note that the bumper balm 1 shown in the second and third embodiments has a feature that it can be manufactured from a substrate 6 having the same shape, although the specification form when being bent by roll forming is different.

Note that the present invention is not limited to the above-described embodiment, and various other modifications are possible. For example, in the case of the illustrated embodiment, the distal ends of the convex portions 4 and 4 in the first embodiment are bent upward with the distal ends of the convex portions 4 and 4 provided in the upper intermediate piece 1e. The distal ends of the convex portions 4 and 4 provided on the lower intermediate piece 1h are bent downward, but conversely, the distal ends of the convex portions 4 and 4 provided on the upper intermediate piece 1e face downward. The protrusions 4 provided on the lower intermediate piece 1h may be bent upward.

Further, the perforation 5 in the first embodiment,
5 is a lower perforation 5b almost immediately below the upper perforations 5a, 5a,
The upper perforations 5a, 5a may be arranged in the vertical direction so that the upper perforations 5a are located almost directly above the lower perforations 5b, 5b. The front piece 1a according to the first embodiment includes an upper step 1j and a lower step 1j.
It is not necessary to have k. However, when the upper step 1j and the lower step 1k are provided, these steps 1j,
It becomes possible to accommodate the front ends of the bent projections 4 and 4 in the depression formed by 1k and the intermediate part 1r.

Further, the upper intermediate piece 1e and the lower intermediate piece 1h in the first and third embodiments are not necessarily formed so as to have a tapered vertical cross-section approaching each other toward the front. It may be formed so as to be substantially parallel to the rear surface of the front piece 1a or the middle connecting piece 1p while being positioned parallel to each other. On the other hand, the upper intermediate piece 1e and the lower intermediate piece 1h in the second embodiment do not have to be formed so as to be connected to the rear surface of the front piece 1a at a substantially right angle, and go forward. It may be formed so as to have a tapered longitudinal section approaching each other. When a car crashes,
When the upper intermediate piece 1e and the lower intermediate piece 1h are formed so as to have a tapered longitudinal section approaching each other as they move forward, the upper intermediate piece 1e and the lower intermediate piece 1h interfere with each other. And the absorption of collision energy at the time of collision becomes good, while the upper intermediate piece 1e and the lower intermediate piece 1h are connected to the rear surface of the front piece 1a or the intermediate connecting piece 1p in a substantially right angle. When it is formed, the structural rigidity is increased, and it is possible to avoid buckling when a collision occurs.

In the third embodiment, the projections 4 and 4 provided on the upper front piece 1m and the projections 4 and 4 provided on the lower line piece 1n are respectively inserted into separate perforations 5,5. So that the perforations 5, 5 provided in the intermediate connecting piece 1p are
The upper perforations 5a, 5a into which the protrusions 4, 4 provided in the upper front piece 1m are inserted, and the upper perforations 5a, 5a into which the protrusions 4, 4 provided in the lower front piece 1n are inserted are independent. Lower holes 5b and 5b may be used. Further, the bumper beam 1 may be intentionally welded so as to be more securely joined between the distal ends of the bent projections 4 and 4 and the mating member that locks the distal ends. .

[0028]

As is clear from the above, according to the automobile bumper beam according to the present invention,
It has the following effects:

According to the bumper beam for an automobile according to the first to fifth aspects, since the cross-sectional shape orthogonal to the longitudinal direction is formed as a tubular structure having a closed cross-sectional shape divided into two upper and lower parts, It can disperse or absorb the impact when a vehicle collides, that is, it can have impact resistance. And since such a tubular structure is formed without the need for a welding step, the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of a vehicle bumper beam according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion showing a state where a protrusion provided on an upper intermediate piece is inserted into an upper hole.

FIG. 3 is an enlarged cross-sectional view of a portion showing a state in which a protrusion provided on a lower intermediate piece is inserted into a lower perforation.

FIG. 4 is a perspective view of a bumper beam for an automobile according to a second embodiment of the present invention, in which a convex portion provided on an upper intermediate piece and a convex portion provided on a lower intermediate piece are inserted into a common perforation provided in a front piece. It is an expanded sectional view in the part showing the state where it fell.

FIG. 5 is an enlarged sectional view of a portion showing a state in which a concave portion provided in the upper intermediate piece and a concave portion provided in the lower intermediate piece are in contact with or near the rear surface side of the front piece.

FIG. 6 shows a third embodiment of a bumper beam for an automobile according to the present invention, in which a projection provided on an upper front piece and a projection provided on a lower front piece are formed in a common perforation provided in an intermediate connecting piece. It is an expanded sectional view in the part showing the state where it was penetrated.

FIG. 7 is an enlarged cross-sectional view showing a state in which a concave portion provided in the upper front piece and a concave portion provided in the lower front piece face each other and are close to each other.

FIG. 8 is a plan view of a substrate used when the bumper beam shown in the first embodiment is manufactured by roll forming.

FIG. 9 is an enlarged perspective view of a main part showing an intermediate stage when the bumper beam shown in the first embodiment is manufactured by roll forming.

FIG. 10 is a plan view of a substrate used when the bumper beams shown in the second embodiment and the third embodiment are manufactured by roll forming.

FIG. 11 is a plan view of an embodiment in which the overall shape of the bumper beam for an automobile according to the present invention is curved.

FIG. 12 is an enlarged sectional view showing a conventional automobile bumper beam.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bumper beam (automobile bumper beam) 1a Front piece 1b Upper body 1c Lower body 1d Upper piece 1e Upper middle piece 1f Upper connecting piece 1g Lower piece 1h Lower middle piece 1i Lower connecting piece 1m Upper front piece 1n Lower Side front piece 1p Intermediate connecting piece 3 Concave part 4 Convex part 5 Drilling 5a Upper drilling 5b Lower drilling 5c Shared drilling

Claims (6)

[Claims] 1. A bumper beam attached to a front side or a rear side of an automobile and having a left and right length, a front piece forming a front face, and an upper body extending rearward from an upper side of the front piece. And a lower body extending rearward from a lower side of the front piece, wherein the upper body forms an upper surface and is connected to an upper end of the front piece, and is located below the upper piece. An upper intermediate piece facing the upper piece, and an upper connecting piece connecting a rear end of the upper piece and a rear end of the upper intermediate piece, and the lower body forms a lower surface. A lower piece connected to the lower end of the front piece, and a lower intermediate piece located above the lower piece and opposed to the lower piece; a rear end of the lower piece and the lower intermediate piece. A lower connecting piece for connecting to a rear end of the upper intermediate piece; A concave portion and a convex portion are repeatedly formed at each of the front ends of the lower intermediate pieces, and the front piece is provided with a hole through which the convex portion is inserted, and A front end side is bent so that it may be stopped by the front side of the front piece, The bumper beam for motor vehicles characterized by the above-mentioned. 2. The perforation includes an upper perforation through which a protrusion provided on the upper intermediate piece is inserted, and a lower perforation through which a protrusion provided on the lower intermediate piece is inserted, independent of the upper perforation. The bumper beam for an automobile according to claim 1, comprising: 3. The upper perforation and the lower perforation are provided so as to be staggered along the longitudinal direction of the front piece, and have a cross section orthogonal to the longitudinal direction at an arbitrary position in the longitudinal direction. The bumper beam for an automobile according to claim 2, wherein at least one of the upper hole and the lower hole is arranged. 4. The automotive vehicle according to claim 1, wherein the perforation is a common perforation through which a projection provided on the upper intermediate piece and a projection provided on the lower intermediate piece are both inserted. Bumper beam. 5. A bumper beam attached to a front side or a rear side of an automobile and having a left and right length, comprising: an upper front piece forming an upper side; and a lower front piece forming a lower side. A front piece, an upper body extending rearward of the upper front piece, a lower body extending rearward of the lower front piece, and an intermediate connecting piece connecting the upper body and the lower body. The upper body forms an upper surface and is connected to the upper end of the upper front piece. The upper body is located below the upper piece and opposed to the upper piece, and the intermediate link is formed at the front end. An upper intermediate piece connected to an upper end of the piece, and an upper connecting piece that connects a rear end of the upper piece and a rear end of the upper intermediate piece, wherein the lower body forms a lower surface and A lower piece connected to the lower end of the lower front piece, and above the lower piece And a lower intermediate piece connected to the lower piece at a front end thereof and connected to a lower end of the intermediate connecting piece, a rear end of the lower piece and a rear end of the lower intermediate piece. And a lower connecting piece for connecting the lower and upper ends of the upper front piece and the lower front piece, and a concave portion and a convex portion are repeatedly formed on the intermediate connecting piece. A bumper beam for an automobile, wherein a perforation through which the convex portion is inserted is provided, and a distal end side of the convex portion is bent so as to be locked to a rear surface side of the intermediate connecting piece. . 6. The perforation according to claim 5, wherein the perforation comprises a common perforation through which a protrusion provided on the upper front piece and a protrusion provided on the lower front piece are both inserted. Automotive bumper beam.