JP5918092B2 - Bumper beam for vehicles - Google Patents

Description

  The present invention relates to a bumper beam for a vehicle such as an automobile, and more particularly to one that suppresses twisting of a main beam at the time of a light collision and secures a deformation stroke at the time of a large collision.

In automobiles such as passenger cars, a bumper beam, which is a beam-like member that extends in the vehicle width direction along the inner surface of the bumper face, which is an exterior member, receives a load from the front side of the vehicle and transmits it to the rear side in the event of a frontal collision. Is provided.
The bumper beam is attached to the vehicle by connecting a stay protruding to the rear side of the main beam to the front end portion of the front side frame on the vehicle body side.

  As a conventional technique related to such a bumper beam, for example, in Patent Document 1, a plurality of flat plate-like separators extending in the front-rear and up-down directions are arranged inside a main beam having a closed cross section to improve strength and rigidity. Is described.

JP 2008-37333 A

Due to the low vehicle height or the like, in the case of a vehicle in which the mounting position of the bumper beam is relatively low with respect to other vehicles, a load may be input only to the upper part of the main beam at the time of a collision.
In such a case, a rotational moment is generated in a direction in which the upper part of the main beam retracts, and even in a light collision with relatively low energy, the upper surface of the main beam buckles and the main beam is twisted. is there.

On the other hand, it is conceivable to provide a separator for partitioning the inside of the main beam as described in Patent Document 1 at a location where the buckling of the upper surface portion occurs. It becomes difficult to secure a collapse stroke of the main beam at the time of a large collision, and the collision performance is deteriorated.
In view of the above-described problems, an object of the present invention is to provide a vehicle bumper beam that suppresses twisting of a main beam during a light collision and secures a deformation stroke during a large collision.

The present invention solves the above-described problems by the following means.
The invention according to claim 1 is arranged to extend in the vehicle width direction at the front end portion of the vehicle body and to have a closed cross section and to protrude from the rear portion of the main beam to the vehicle rear side, and the rear end portion of the vehicle body A bumper beam for a vehicle including a stay coupled to a front side frame, wherein the main beam is a front surface portion disposed on the front side of the vehicle and a rear surface portion disposed on the rear side of the front surface portion with a space therebetween. And an upper surface portion provided between an upper end portion of the front surface portion and an upper end portion of the rear surface portion, and a lower surface portion of the front surface portion and a lower end portion of the rear surface portion. A lower surface portion, connecting the upper surface portion and the lower surface portion, and spaced from the front surface portion and the rear surface portion, respectively, and from the region adjacent to the front end portion of the stay in the vehicle width direction Stretches inward One is a vehicle bumper beam, characterized in that it comprises a transverse separator disposed at a central portion in the vehicle width direction.
According to this, buckling of the upper surface portion of the main beam at the time of a light collision can be prevented, the main beam can be prevented from being twisted, and man-hours and costs required for repairing the vehicle can be reduced.
In addition, the horizontal separator is disposed at a distance from the front and rear surface portions of the main beam so that the space between the front surface portion and the horizontal separator and between the horizontal separator and the rear surface portion are narrowed in the event of a large collision. Since the main beam is not prevented from being crushed, a deformation stroke at the time of a large collision can be secured.

The invention according to claim 2 is characterized in that the main beam has a vertical separator that is disposed substantially along the vehicle front-rear direction in the space between the left and right horizontal separators and substantially closes the inside of the main beam. The vehicle bumper beam according to claim 1.
According to this, the cross-sectional deformation in the center part of the main beam can be suppressed by a relatively lightweight structure.

The invention according to claim 3 has a reinforcing member provided between the upper surface portion of the stay and the region joined to the horizontal separator in the upper surface portion of the main beam. A bumper beam for a vehicle according to claim 1 or claim 2.
According to this, the rigidity of the upper surface portion of the main beam can be further improved, and the above-described effects can be obtained more reliably.

  As described above, according to the present invention, it is possible to provide a vehicle bumper beam that suppresses the twisting of the main beam at the time of a light collision and secures a deformation stroke at the time of a large collision.

It is a disassembled perspective view of the Example of the bumper beam for vehicles to which this invention is applied. It is the top view which looked at the bumper beam of FIG. 1 from upper direction. It is the III-III part arrow directional view of FIG. It is a schematic diagram which shows the behavior at the time of the frontal collision of the bumper beam for vehicles which is a comparative example of this invention. It is a schematic diagram which shows the behavior at the time of the frontal collision of the bumper beam for vehicles of an Example.

  An object of the present invention is to provide a vehicle bumper beam that suppresses the twisting of the main beam at the time of a light collision and secures a deformation stroke at the time of a large collision. The problem has been solved by providing a horizontal separator that extends inward in the width direction, is spaced apart from the front surface portion and the rear surface portion of the main beam and connects the upper surface portion and the lower surface portion.

Embodiments of a vehicle bumper beam (hereinafter simply referred to as “bumper beam”) to which the present invention is applied will be described below.
The bumper beam of the embodiment is provided at the front end of a vehicle body such as a passenger car having a relatively low vehicle height, for example.
The bumper beam is provided inside a bumper face that is an exterior part formed of a resin material such as PP, for example, and transmits a load received from an obstacle at the time of a collision to a front side frame that is a structural member of the vehicle body. It itself collapses and absorbs energy.

FIG. 1 is an exploded perspective view of a bumper beam according to an embodiment.
FIG. 2 is a plan view of the bumper beam of FIG. 1 as viewed from above.
FIG. 3 is a view taken along the line III-III in FIG. 2 and is viewed from the front side of the vehicle.
The bumper beam 1 includes a main beam 100, a stay 210, a phosphorus reinforcement 220, a vertical separator 310, a horizontal separator 320, and the like.
The main beam 100 is a beam-like member extending substantially along the vehicle width direction.
The main beam 100 has a hollow structure having a closed cross section when viewed from the vehicle width direction.
As shown in FIG. 2, the main beam 100 is formed to be curved so that the front side of the vehicle is convex in accordance with the formation of a bumper face (not shown).

As shown in FIG. 1, the main beam 100 is configured by joining a rear panel 110 and a front panel 120 by spot welding or the like.
The rear panel 110 and the front panel 120 are formed by pressing a steel plate or the like, for example.

The rear panel 110 includes a rear surface portion 111, an upper surface portion 112, and a lower surface portion 113 that are integrally formed.
The rear surface portion 111 is a surface portion provided at the rear end portion of the main beam 100 and extending substantially along the vertical direction.
The upper surface portion 112 is a substantially flat portion that protrudes forward from the upper end portion of the rear surface portion 111.
A flange portion 112 a that protrudes upward is formed at the front end portion of the upper surface portion 112.
The lower surface portion 113 is a substantially flat portion that protrudes forward from the lower end portion of the rear surface portion 111.

The front panel 120 is a panel that constitutes the front portion of the main beam 100.
The upper end portion and the lower end portion of the front panel 120 are joined to the front end portion of the upper surface portion 112 and the lower surface portion 113 of the rear panel 110, for example, by spot welding or the like.
A groove 121 extending in the vehicle width direction is formed at the center of the front panel 120 in the height direction.
At the upper end portion of the front panel 120, a flange portion 122 protruding upward from the upper surface portion 112 of the rear panel 110 is formed.
The flange portion 122 is joined by spot welding or the like in a state of being overlapped with the flange portion 112a of the upper surface portion 112 described above.
A flange portion 123 protruding rearward is formed at the lower end portion of the front panel 120.
The flange portion 123 is provided on the lower side of the lower surface portion 113 of the rear panel 110, and is joined by spot welding or the like in a state of being overlapped with the front end portion of the lower surface portion 113.
With the configuration described above, the main beam 100 has a substantially substantially rectangular closed cross section.

The stay 210 is a member that couples the rear portion of the main beam 100 and a front side frame front end portion of a vehicle body (not shown).
The stay 210 is a columnar member extending substantially along the vehicle front-rear direction.
The front end portion of the stay 210 is welded to the rear surface portion 111 of the rear panel 110 of the main beam 100.
At the rear end of the stay 210, there is provided a flange portion 211 formed so as to project in a collar shape.
Bolt holes are formed in the flange portion 211 and fastened to the front end portion of the front side frame.

The reinforcement 220 is a stiffening member welded to the upper surface 112 of the rear panel 110 of the stay 210 and the main beam 100.
The phosphorus reinforcement 220 is formed by press-molding a steel plate, for example.
The reinforcement 220 is a substantially flat panel arranged substantially horizontally, and has irregularities appropriately formed to improve rigidity.
As shown in FIG. 2, the phosphorus reinforcement 220 covers substantially the entire upper surface of the stay 210.
The front part of the reinforcement 220 covers the latter half of the upper surface part 112 of the main beam 100.
The reinforcement 220 is formed so as to extend inward and outward in the vehicle width direction with respect to the stay 210.
The outer end of the reinforcement 220 in the vehicle width direction is disposed adjacent to the side end of the main beam 100.

The vertical separator 310 is a stiffening member provided inside the main beam 100.
The vertical separator 310 is formed by press-molding a steel plate, for example.
As shown in FIG. 1, the vertical separator 310 is a substantially flat panel arranged substantially along the front-rear direction and the vertical direction of the vehicle.
The upper end portion of the vertical separator 310 is fixed to the upper surface portion 112 of the rear panel 110 by spot welding or the like.
The lower end of the vertical separator 310 is fixed to the lower surface 113 of the rear panel 110 by spot welding or the like.
For example, two vertical separators 310 are disposed in the vicinity of the center of the main beam 100 in the vehicle width direction so as to be separated from each other in the vehicle width direction.

The horizontal separator 320 is a stiffening member provided inside the main beam 100.
The horizontal separator 320 is formed by press-molding a steel plate, for example.
As shown in FIGS. 1 and 2, the horizontal separator 320 is a substantially flat panel disposed substantially along the longitudinal direction and the vertical direction of the main beam 100.
As shown in FIG. 1, flange portions 321 and 322 projecting forward are formed at the upper end portion and the lower end portion of the horizontal separator 320, respectively.
The flange portions 321 and 322 are respectively fixed to the upper surface portion 112 and the lower surface portion 113 of the rear panel 110 by spot welding or the like.

As shown in FIG. 2, the horizontal separator 320 is disposed so as to face the front surface portion and the rear surface portion of the main beam 100 with a space therebetween.
That is, the front surface of the horizontal separator 320 faces the front panel 120 with a space in the vehicle front-rear direction.
Further, the rear surface of the horizontal separator 320 faces the rear surface portion 111 of the rear panel 110 with a space in the vehicle front-rear direction.

The end of the lateral separator 320 on the outer side in the vehicle width direction is disposed at a position overlapping the stay 210 when viewed from the front side of the vehicle.
The inner end of the horizontal separator 320 in the vehicle width direction is disposed at a distance from the vertical separator 310 in the vehicle width direction.
That is, the horizontal separator 320 is disposed so as to leave a central portion in the vehicle width direction of the main beam 100.
Such a horizontal separator 320 is arranged in such a manner that when a load due to a collision is input to the upper portion of the central portion of the main beam 100 and the main beam 100 is twisted, the horizontal separator 320 is not provided. 112 is set so as to pass through an area where buckling is a concern.
Further, the front end portion on the inner side in the vehicle width direction of the phosphorus reinforcement 220 is disposed so as to overlap the end portion on the outer side in the vehicle width direction of the horizontal separator 320 when viewed from above.

Next, the effect of the above-described embodiment will be described in comparison with a comparative example of the present invention described below.
FIG. 4 is a schematic diagram showing the behavior of the vehicle bumper beam of the comparative example at the time of a frontal collision.
The bumper beam 1A of the comparative example is obtained by omitting the horizontal separator 320 from the bumper beam 1 of the embodiment.
FIG. 4A is a plan view of a state in which the front collision barrier B has collided with the central portion in the vehicle width direction of the bumper beam 1A as viewed from above.
FIG. 4B is a cross-sectional view taken along the line bb in FIG.
FIG.4 (c) is sectional drawing which shows the state after the collision in the same cross section as FIG.4 (b).
FIG.4 (d) is sectional drawing which shows the state after the collision in the dd part arrow cross section of Fig.4 (a).

When a vehicle with a relatively low vehicle height collides with a vehicle with a relatively high vehicle height such as an SUV vehicle, as shown in FIG. ) And the wrap amount in the height direction are reduced, and a load is input only to the upper part of the main beam 100.
In this case, a moment is generated in the main beam 100 so as to rotate so that the upper part moves backward (clockwise direction in FIG. 4), and the main beam 100 is twisted as shown in FIG. Will receive.
At this time, in the comparative example, as shown in FIG. 4D, the upper surface portion of the main beam 100 is buckled and a relatively large torsional deformation occurs.
Even in the case of a light collision, if such buckling occurs, the main beam 100 needs to be replaced, and the man-hours and costs required for repair increase.

FIG. 5 is a schematic diagram illustrating the behavior of the vehicle bumper beam according to the embodiment at the time of collision.
FIG. 5A is a plan view of the state in which the front collision barrier B has collided with the central portion in the vehicle width direction of the bumper beam 1 as viewed from above.
FIG. 5B is a cross-sectional view taken along the line bb in FIG.
FIG.5 (c) is sectional drawing which shows the state at the time of the big collision in the same cross section as FIG.5 (b).

In the embodiment, by providing the horizontal separator 320, buckling of the upper surface portion of the main beam 100, which is a problem in the comparative example at the time of a light collision, is less likely to occur, as shown in FIG. The cross-sectional shape of the main beam 100 is maintained, and damage can be prevented.
Accordingly, it is difficult to replace the bumper beam 1 at the time of a light collision, and it is possible to reduce the man-hours and costs required for repair.

  On the other hand, at the time of a large collision with a large input such as a collision from a relatively high speed, the main beam 100 is crushed before and after the lateral separator 320 as shown in FIG. Impact energy can be absorbed well.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The main beam 100 at the time of a light collision is provided in the main beam 100 by providing a lateral separator 320 that faces the front and rear surfaces with a gap and extends inward in the vehicle width direction immediately before the stay 210. It is possible to prevent buckling of the upper surface portion of 100, suppress twisting of the main beam 100, and reduce man-hours and costs required for vehicle repair.
Further, since the horizontal separator 320 is disposed at a distance from the front and rear surfaces of the main beam 100, the front panel 120 and the horizontal separator 320, and between the horizontal separator 320 and the rear surface 111 at the time of a large collision. Since the main beam 100 is not prevented from being collapsed so as to narrow the gap, a deformation stroke at the time of a large collision can also be secured.
(2) When the vertical separator 310 is provided at the center in the vehicle width direction of the main beam 100, for example, a separator extending along the longitudinal direction of the main beam 100 is provided over substantially the entire length of the main beam 100. In comparison, the cross-sectional deformation at the central portion of the main beam 100 can be suppressed by a relatively lightweight structure.
(3) The rigidity of the upper surface portion of the main beam 100 is further improved by providing the phosphorus reinforcement 220 that connects the upper surface portion of the stay 210 and the region joined to the horizontal separator 320 in the upper surface portion 112 of the main beam 100. Thus, the effects described above can be obtained more reliably.

(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.
For example, the shape, structure, material, manufacturing method, joining method and the like of each member constituting the vehicle bumper beam are not limited to the above-described embodiments, and can be changed as appropriate.

1 Bumper beam (Example) 1A Bumper beam (Comparative example)
100 main beam 110 rear panel 111 rear surface portion 112 upper surface portion 112a flange portion 113 lower surface portion 120 front panel 121 groove portion 122 flange portion 123 flange portion 210 stay 211 flange portion 220 phosphorus reinforcement 310 vertical separator 320 horizontal separator 321 flange portion 322 flange portion B Frontal collision barrier

Claims (3)

A main beam which is disposed extending in the vehicle width direction at the front end of the vehicle body and has a closed cross section;
A vehicular bumper beam comprising: a stay that protrudes from the rear portion of the main beam toward the vehicle rear side and that has a rear end portion coupled to a front side frame of a vehicle body;
The main beam is
A front portion disposed on the front side of the vehicle;
A rear surface portion disposed at an interval on the rear side of the front surface portion;
An upper surface provided between the upper end of the front surface and the upper end of the rear surface;
A lower surface portion provided between the lower end portion of the front surface portion and the lower end portion of the rear surface portion;
The upper surface portion and the lower surface portion are connected to each other and are spaced from the front surface portion and the rear surface portion, respectively, and extend inward in the vehicle width direction from a region adjacent to the front end portion of the stay and in the vehicle width direction. A bumper beam for a vehicle, comprising a horizontal separator disposed with a central portion in between. 2. The vehicle according to claim 1, wherein the main beam includes a vertical separator that is disposed substantially along a vehicle front-rear direction in a space between the left and right horizontal separators and substantially blocks the inside of the main beam. Bumper beam. 3. The reinforcing member according to claim 1, further comprising a reinforcing member provided between an upper surface portion of the stay and a region of the upper surface portion of the main beam that is joined to the horizontal separator. Bumper beam for vehicles.

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