JP2009241724A - Vehicular bumper beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight vehicular bumper beam having good shock absorbability in an oblique collision. <P>SOLUTION: The vehicular bumper beam 1 has a main beam 10 with a first panel 11 extending in a vehicle width direction to oppose a bumper face F and a second panel 12 which forms a closed cross section together with the first panel and is shorter than the first panel in the vehicle width direction, a pair of right and left stays 20 respectively formed on the both end portions in the vehicle width direction of the second panel and fixed to the car body, and a reinforcing member 30 which, in an area outside the stay in the vehicle width direction, is fixed to a surface portion on the opposite side of the bumper face of the first panel, forms a closed cross section smaller than the closed cross section of the main beam together with the first panel, and has an end portion connected to a side portion 20a of the stay inside in the vehicle width direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bumper beam disposed in a bumper provided at a front and rear end of a vehicle body such as an automobile.

  A bumper provided on the front and rear of a vehicle body such as an automobile is generally provided with a bumper beam, which is a beam-like structural member extending in the vehicle width direction, inside a bumper face made of resin or the like constituting the surface of the vehicle body. . Usually, such a bumper beam is supported by a stay protruding from a side frame end of the vehicle body.

In recent years, a bumper beam is required to have sufficient energy absorption capability against a collision from an oblique front of a vehicle (in the case of a front bumper) or an oblique rearward (in the case of a rear bumper).
For example, in Patent Document 1, for the purpose of increasing the impact energy absorption efficiency against an oblique collision, the front wall portions of both ends of the bumper beam (bumper force) are cut into inclined surfaces, and a cover made of a separate member is attached thereto. And it is described that it couple | bonds with the base board provided in the main body lower surface.
JP 2007-45171 A

When the vehicle collides diagonally, the end of the bumper beam is in a cantilevered load configuration, so that a large bending stress is applied to the connection with the stay, and the impact absorption capacity is reduced due to the bending or bending of the bumper beam. Concerned.
On the other hand, the strength required at the end of the bumper beam is not as severe as that at the center, so if the same cross-sectional shape is provided over the entire length of the bumper beam, the strength at the end becomes excessive and increases weight and costs. Cause.
The subject of this invention is providing the bumper beam for vehicles which is excellent in the impact-absorbing performance with respect to an oblique collision, and is lightweight.

The present invention solves the above-described problems by the following means.
The invention according to claim 1 is a first panel that faces the bumper face and extends in the vehicle width direction, and forms a closed section together with the first panel and has a vehicle width direction length longer than that of the first panel. A main beam having a second panel formed short, a pair of left and right stays provided at both ends of the second panel in the vehicle width direction and fixed to the vehicle body, and an area outside the stay in the vehicle width direction The first panel is fixed to the surface of the first panel opposite to the bumper face and has a closed cross-section that is smaller than the closed cross-section of the main beam together with the first panel, and the inner end in the vehicle width direction is the end It is a bumper beam for vehicles provided with the stiffening member connected to the side part of a stay.

According to a second aspect of the present invention, the stay includes a flange portion that protrudes from a side portion on the outer side in the vehicle width direction, and an end portion on the inner side in the vehicle width direction of the stiffening member is fixed to the flange portion by welding. The vehicle bumper beam according to claim 1.
The invention according to claim 3 is the vehicle bumper beam according to claim 1 or 2, wherein the stiffening member is formed by joining a plurality of panels divided vertically.

According to the present invention, the following effects can be obtained.
(1) By forming a closed cross-section with the first panel in a region outside the stay in the vehicle width direction and providing a stiffening member connected to the side of the stay, a part of the input at the time of an oblique collision can be obtained. Since it is input from the stiffening member to the side of the stay, the bending stress applied to the main beam is relieved. As a result, it is possible to prevent the main beam from being bent or bent and to obtain a good shock absorbing performance.
In addition, the closed cross section formed by the first panel and the stiffening member is formed smaller than the closed cross section formed at the center of the main beam by the first and second panels, so that the bumper beam side It is possible to optimize the strength at the end and reduce the weight.
(2) By welding and fixing the stiffening member to the flange portion protruding from the side of the stay, the input from the stiffening member to the flange portion is transmitted along the shear direction where the welded portion exhibits a relatively high strength. can do.

  An object of the present invention is to provide a vehicle bumper beam that is excellent in shock absorption performance against oblique collisions and is lightweight. A vehicle body side panel of the main beam is formed shorter than a panel on the bumper face side, and the vehicle body of the main beam is formed at both ends. The problem was solved by providing a phosphorus reinforcement that forms a closed cross section smaller than the central portion of the main beam together with the side panel, and joining the end of the phosphorus reinforcement inside in the vehicle width direction to the side of the stay.

Embodiments of a vehicle bumper beam to which the present invention is applied will be described below. The bumper beam of this embodiment is for a rear bumper provided at the rear part of a vehicle body of a passenger car, for example.
FIG. 1 is a two-side view of a bumper beam according to an embodiment. FIG. 1A is a plan view seen from above, and FIG. 1B is a rear view seen from the rear side of the vehicle (a view taken along the line bb in FIG. 1A).
FIG. 2 is an exploded perspective view of the bumper beam.
3 is a cross-sectional view taken along the line III-III in FIG.
4 is a cross-sectional view taken along the line IV-IV in FIG.
FIG. 5 is an enlarged perspective view of a portion V in FIG.
6 is an enlarged perspective view of a portion VI in FIG.
FIG. 7 is an external perspective view of the side end portion of the bumper beam as viewed obliquely upward and obliquely rearward.

The bumper beam 1 includes a main beam 10, a stay 20, a phosphorus reinforcement 30, a shock absorbing foam 40 (see FIG. 3), and the like. Each member described below is formed by performing sheet metal processing such as press molding or roll molding on a metal plate such as a steel plate unless otherwise specified, and is joined by welding such as spot welding.
The main beam 10 is a main body portion of the bumper beam 1 formed in a beam shape extending in the vehicle width direction. The main beam 10 includes a rear panel 11 and a front panel 12.

  The rear panel 11 is a portion constituting a rear surface portion of the main beam 10 that is disposed to face the bumper face F (see FIGS. 3 and 4). The rear panel 11 is formed in a belt-like shape extending in the vehicle width direction, and is formed with a curved planar shape as viewed from above the vehicle so as to conform to the formation of the bumper face F as shown in FIG. ing. As shown in FIG. 3, a flange 11 a protruding toward the front side of the vehicle is provided at the upper end of the rear panel 11.

As shown in FIG. 3, the front panel 12 is a portion that is disposed on the anti-bumper face F side (the skirt S side of the vehicle body) of the rear panel 11 and forms a closed section S1 together with the rear panel 11. The front panel 12 includes a vertical wall portion 12a, an upper surface portion 12b, and a lower surface portion 12c.
The vertical wall portion 12a is a portion that is provided between the rear panel 11 and the skirt S and is opposed to each other with an interval therebetween. The vertical wall portion 12 a constitutes a front surface portion in the central portion of the main beam 10.
The upper surface portion 12b is a portion protruding from the upper end portion of the vertical wall portion 12a to the rear panel 11 side (vehicle rear side). The rear end portion of the upper surface portion 12 b is joined to the flange portion 11 a of the rear panel 11. The upper surface portion 12 b constitutes an upper surface portion in the central portion of the main beam 10.
The lower surface portion 12c is a portion protruding from the lower end portion of the vertical wall portion 12a to the rear panel 11 side. A flange portion protruding downward is formed at the rear end portion of the lower surface portion 12 c, and this flange portion is joined to the front surface portion of the rear panel 11. The lower surface portion 12 c constitutes a lower surface portion in the central portion of the main beam 10.

As shown in FIG. 1A and the like, the front panel 12 is formed to be shorter in the vehicle width direction than the rear panel 11. That is, at the left and right ends of the main beam 10, there is a region where only the rear panel 11 is provided and the front panel 12 is not provided.
In addition, a separator (not shown) is appropriately provided inside the main beam 10.

The stay 20 is a part that fixes the bumper beam 1 to the vehicle body. The stay 20 is formed in a columnar shape having a square cross section that extends substantially along the traveling direction of the vehicle. A front end portion of the stay 20 is fixed to a rear end portion of a vehicle body side frame (not shown). The rear end portion of the stay 20 is fixed to the left and right end portions of the front panel 12 in the main beam 10.
The stay 20 includes an upper panel 21, a lower panel 22, a base plate 23, and the like.
In FIG. 6, the stay 20 is not shown.
In FIG. 2, the stay 20 and the reinforcement 30 are shown only on the left side.

The upper panel 21 and the lower panel 22 are parts constituting upper and lower parts of the main body of the stay 20. The upper panel 21 and the lower panel 22 are fixed by joining flange portions that protrude from the side surface portion to the outside in the vehicle width direction. (Hereinafter, the flange portion will be described with reference numeral 20a (see FIG. 5, FIG. 7, etc.).)
The upper surface portion of the upper panel 21 and the rear end portion of the lower surface portion of the lower panel 22 are formed to extend to the upper side of the upper surface portion 12b of the front panel 12 and the lower side of the lower surface portion 12c, respectively. It is joined.
Further, as shown in FIG. 7, flange portions 21 a and 22 a are formed at the front end portions of the upper panel 21 and the lower panel 22.
The base plate 23 is a stiffening plate fixed to the flange portions 21a and 22a. The base plate 23 functions as a base when the bumper beam 1 is fixed to the vehicle body.
In FIG. 7, the base plate 23 is not shown.

As shown in FIG. 4, the reinforcement 30 forms a closed cross-section S <b> 2 together with the rear panel 11 at the side end where the front panel 12 of the main beam 10 is not provided, and connects the rear panel 11 and the side of the stay 20. It is to be combined.
The phosphorus reinforcement 30 is divided into upper and lower parts, and includes an upper panel 31 and a lower panel 32.

The upper panel 31 is a part constituting the upper surface portion of the phosphorus reinforcement 30. A flange portion 31 a raised upward is formed at the rear end portion of the upper panel 31. The flange portion 31 a is joined to the front portion of the rear panel 11.
As shown in FIG. 7, a blister-shaped step portion 31 b formed to protrude upward is provided at the end of the upper panel 31 on the inner side in the vehicle width direction (stay 20 side). The end portion of the step portion 31b on the stay 20 side is disposed on the upper surface portion of the flange portion 20a of the stay 20, and is joined to the flange portion 20a by welding. Further, a flange portion 31 c raised upward is formed at the end of the step portion 31 b and is joined to the side surface portion of the stay 20.
The flange portion 31 a and the flange portion 31 c described above are connected by a rib 31 d raised along the edge portion of the upper panel 31.

The lower panel 32 is a part constituting the front surface portion and the lower surface portion of the phosphorus reinforcement 30.
The lower panel 32 includes a vertical wall portion 32a, a lower surface portion 32b, and the like.
The vertical wall portion 32 a is a portion constituting the front portion of the phosphorus reinforcement 30. As shown in FIG. 6, the upper end portion of the vertical wall portion 32a is joined to the lower surface portion of the upper panel 31 via a flange portion that protrudes forward. Further, as shown in FIG. 7, the end of the vertical wall portion 32 a on the outer side in the vehicle width direction is joined to the front portion of the rear panel 11.

The lower surface portion 32 b is a portion that protrudes from the lower end portion of the vertical wall portion 32 a to the rear side (rear panel 11 side) and constitutes the lower surface portion of the phosphorus reinforcement 30. The rear end portion of the lower surface portion 32 b is joined to the front surface portion of the rear panel 11. As a result, the phosphorus reinforcement 30 and the rear panel 11 together form a closed section S2 shown in FIG. The closed cross section S2 is formed smaller than the closed cross section S1 formed by the rear panel 11 and the front panel 12 at the center of the main beam 10 in accordance with the strength required for the side of the bumper beam 1. Further, the closed cross section S2 is formed so as to gradually decrease from the vehicle width direction inner side (stay side) to the vehicle width direction outer side.
Further, the inner end of the lower surface portion 32 b in the vehicle width direction is joined to the lower surface portion of the lower panel 22 of the stay 20.

  The shock absorbing foam 40 is formed in a block shape by, for example, a foam resin having shock absorbing properties, and is fixed to the rear surface portion of the rear panel 11 as shown in FIG.

According to the present embodiment described above, the following effects can be obtained.
(1) A closed section S2 is formed together with the rear panel 11 in a region outside the stay 20 in the vehicle width direction, and a phosphorus reinforcement 30 connected to the side of the stay 20 is provided. Since the portion is input from the reinforcement 30 to the side portion of the stay 20, the bending stress applied to the main beam 10 is relieved. As a result, the main beam 10 can be prevented from being bent or broken, and good shock absorption performance can be obtained.
Further, the closed cross section formed by the rear panel 11 and the phosphorus reinforcement 30 is formed smaller than the closed cross section formed at the center of the main beam 10 by the rear panel 11 and the front panel 12, so that the bumper beam 1 side is formed. It is possible to optimize the strength at the end and reduce the weight.
(2) By welding and fixing the upper panel 31 of the phosphorus reinforcement 30 to the flange portion 20a protruding from the side portion of the stay 20, the input from the phosphorus reinforcement 30 to the flange portion 20a is relatively high at the welding location. It can be transmitted along the shear direction indicating strength.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The embodiment described above relates to the bumper beam provided in the rear bumper, for example, but the present invention is not limited to this, and can be applied to the bumper beam provided in the front bumper.
(2) The shape, structure, material, manufacturing method, dividing method and the like of each member are not limited to the above-described embodiments, and can be changed as appropriate.

It is a two-view figure in the Example of the bumper beam for vehicles to which this invention is applied. It is a disassembled perspective view of the bumper beam of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1. It is the V section enlarged perspective view of FIG. FIG. 6 is an enlarged perspective view of a VI part in FIG. 1. It is the external appearance perspective view which looked at the side edge part of the bumper beam of FIG. 1 from diagonally upward and diagonally backward.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper beam 10 Main beam 11 Rear panel 11a Flange part 12 Front panel 12a Vertical wall part 12b Upper surface part 12c Lower surface part 20 Stay 20a Flange part 21 Upper panel 22 Lower panel 23 Base plate 30 Reinforcement 31 Upper panel 31a Flange part 31b Step part 31c Flange part 31c Rib 32 Lower panel 32a Vertical wall portion 32b Lower surface portion 40 Shock absorbing foam F Bumper face S Skirt S1 Closed section (bumper beam center)
S2 Closed section (bumper beam end)

Claims (3)

A first panel that faces the bumper face and extends in the vehicle width direction, and a second panel that forms a closed cross-section with the first panel and has a shorter length in the vehicle width direction than the first panel. A main beam having a panel;
A pair of left and right stays respectively provided at both ends in the vehicle width direction of the second panel and fixed to the vehicle body;
In a region outside the stay in the vehicle width direction, a closed cross section that is fixed to a surface portion of the first panel on the side opposite to the bumper face and has a smaller area than the closed cross section of the main beam is formed together with the first panel. A vehicular bumper beam comprising: a stiffening member whose inner end in the vehicle width direction is connected to a side portion of the stay. The stay has a flange portion projecting from a lateral side outside in the vehicle width direction,
The vehicular bumper beam according to claim 1, wherein an end portion of the stiffening member on the inner side in the vehicle width direction is fixed to the flange portion by welding. The vehicular bumper beam according to claim 1, wherein the stiffening member is configured by joining a plurality of panels divided vertically.

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