JP2007131150A - Front bumper structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide front bumper structure of a vehicle improved in the collision energy absorbing effect in a low-speed collision, while reducing bend of a collided article in a collision of an auxiliary bumper such as a walker protecting bumper provided with a main bumper with the collided article. <P>SOLUTION: In the front bumper structure of a vehicle provided with a main bumper 1 and the auxiliary bumper 2 as the walker protecting bumper provided in a lower part in front of the main bumper 1 in a front part 201 of a vehicle body 100, the auxiliary bumper 2 is structured by connecting an absorber 4, which is formed by bending a plate material, to front sides of main body members 6 and 7 extended in the vehicle cross direction, and a plurality of beads 5 extended in the back and forth direction are formed in the top surface of the absorber 4 with a predetermined interval along the vehicle cross direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is particularly applied to an automobile provided with an auxiliary bumper as a bumper for protecting a pedestrian, and a pedestrian at a front part of a vehicle body, a main bumper, a lower part of the main bumper, and a vehicle front side of the main bumper. The present invention relates to a vehicle front bumper structure provided with an auxiliary bumper including a protective bumper.

In a vehicle equipped with a pedestrian protection bumper, as shown in FIGS. 1 and 2, the vehicle is located below the main bumper 1 for high-speed collision provided on the front portion 201 of the vehicle body 100 and more than the main bumper 1. A pedestrian protection bumper 2 is provided on the front side of the vehicle.
20 and 21 show a conventional example of such a pedestrian protection bumper 2, FIG. 20 is an external perspective view of the pedestrian protection bumper according to the prior art, and FIG. 21A is a pedestrian. The principal part external appearance perspective view of a protection bumper, (B) is the NN sectional view taken on the line in (A).

In FIG. 20, the pedestrian protection bumper 2 is supported by the support member 10 at the center part of the main body members 6, 7, which are extended in the vehicle width direction and are composed of two pipes stacked vertically. The brackets 03, 03 attached to both ends in the vehicle width direction are fixed to the vehicle body side by bolts and are supported at the vehicle body front portion.
As shown in FIG. 21, the absorber 04 is welded and joined to the upper and lower surfaces of the body members 6 and 7 of the bumper 2 for protecting the pedestrian so as to protrude from the body members 6 and 7 to the front of the vehicle. A collision object collides with the tip.

Further, in Patent Document 1 (Japanese Patent Laid-Open No. 11-342812), a collision energy absorption bumper is formed in a shape that protrudes from the upper part to the front of the vehicle from the upper part, and a position far from the bending point of the collision object is defined as the collision point. Thus, a vehicle front bumper structure is disclosed in which, when a collision occurs with a collided object that is bent in the middle in a columnar shape, the energy of the collision is reduced to reduce the impact on the collided object.
Japanese Patent Laid-Open No. 11-342812

  As described above, in the structure of the conventional pedestrian protection bumper 2 shown in FIGS. 20 and 21, the plate members are bent in the shape of a substantially triangular section in the lateral direction on the upper and lower surfaces of the body members 6 and 7. The base part of the absorber 04 formed in this manner is welded and protruded from the main body members 6 and 7 to the front of the vehicle, and a collision object collides with the tip part.

For this reason, in such a conventional technique, as shown in FIG. 19, the pedestrian protection bumper 2 collides with the colliding object 101 having the bent portion 101b in the middle, and is bent into a substantially triangular cross-section. When an upward pressing force is applied to the formed absorber 04, the rigidity of the upper surface and the lower surface of the absorber 04 is equivalent and relatively soft, so that the point of action of the force moves upward in the direction of the pressing force. There is a problem that it is easily bent and the required shock absorbing effect cannot be obtained.
Further, the deformation of the bracket 03 at the time of a collision may cause the bumper 2 for protecting the pedestrian 2 and the absorber 04 to move upward, and the point of action of the force moves upward, so that the required impact absorbing effect cannot be obtained. Have a problem.
Further, the bracket 03 merely has a function of attaching the bumper 2 for protecting the pedestrian to the vehicle body side, and the bracket 03 itself effectively absorbs an impact force in a low-speed collision with the vehicle or the vehicle. It does not have a function to do.
In the above-mentioned Patent Document 1, no means for solving such a problem is shown.

  The present invention has been made in view of such a situation, and the object thereof is to bend the collision object when the auxiliary bumper provided in the main bumper such as a bumper for pedestrian protection collides with the collision object. An object of the present invention is to provide a front bumper structure for a vehicle in which the effect of absorbing the collision energy at the time of a low-speed collision is improved.

  In order to solve the above-described problems of the prior art, the present invention is directed to a vehicle in which an auxiliary bumper is provided at a front portion of a vehicle body at a front portion of a main bumper and a lower portion of the main bumper and on the vehicle front side than the main bumper. In the front bumper structure, the auxiliary bumper is configured by connecting an absorber formed by bending a plate material on the front side of the main body member extending in the vehicle width direction, and the upper surface of the absorber is provided with the absorber. A plurality of beads extending in the front-rear direction are formed at predetermined intervals along the vehicle width direction.

  In addition, in the present invention, the bead is formed in a substantially triangular shape that is wide in the planar shape at the joint portion side of the absorber and the main body member and becomes narrower toward the front side of the absorber. .

  Further, the present invention provides a vehicle front bumper structure in which an auxiliary bumper is provided at a front portion of a vehicle body at a front portion of a main bumper and a lower portion of the main bumper and on the vehicle front side of the main bumper. It is constructed by connecting an absorber formed by bending a plate material on the front side of the main body member extending in the width direction, and both ends in the vehicle width direction of the main body member are connected to the vehicle body via a bracket of the plate material. The bracket has a U-shape that protrudes inward in the vehicle width direction, and a bead extending in the vertical direction is formed at a plurality of locations in the vehicle front-rear direction on the side of the bracket.

Furthermore, in the present invention, specifically, the following configuration is preferable.
(1) The bracket is configured by connecting a vehicle body side mounting flange portion to be mounted on a vehicle body side and an auxiliary bumper side mounting portion to be mounted on a body member side of the auxiliary bumper with a connecting member having a vertical plate surface. The bead is formed on the connecting member.

  (2) The bracket is formed by extending an auxiliary bumper side attaching portion attached to the main body member side of the auxiliary bumper from a joint portion to the connecting member inward in the vehicle width direction.

  (3) Reinforcing reinforcements are provided at the connecting portion of the bracket to the body member side and the connecting portion to the vehicle body side.

  As described above, the front bumper structure of the vehicle according to the present invention is such that a main bumper and a lower part of the main bumper are provided at the front portion of the vehicle body and an auxiliary bumper is provided in front of the main bumper. The auxiliary bumper is configured by connecting an absorber formed by bending a plate material on the front side of a main body member extending in the vehicle width direction, and an upper surface of the absorber has a front-rear direction of the absorber. Since a plurality of beads extending in the vehicle width direction are formed at predetermined intervals along the vehicle width direction, the rigidity in the vehicle front-rear direction on the upper surface of the absorber is increased, and an auxiliary bumper at the time of a collision with a collision object having a bent portion in the vertical direction Can be prevented from being bent due to the collision of the colliding object.

  In addition, in the present invention, the bead is formed in a substantially triangular shape that is wide in a planar shape at the joint portion side of the absorber and the main body member and becomes narrower toward the front side of the absorber. Therefore, while suppressing the upward deformation of the auxiliary bumper and avoiding the bending due to the collision of the colliding object, the narrow portion on the front side of the absorber having a small rigidity is deformed at the initial stage of the collision with the colliding object, It is possible to absorb and mitigate the impact on the collision object at the initial stage of the collision.

Further, the vehicle front bumper structure according to the present invention is provided with a main bumper and a lower part of the main bumper at the front portion of the vehicle body, and an auxiliary bumper provided on the vehicle front side of the main bumper, The auxiliary bumper is configured by connecting an absorber formed by bending a plate material on the front side of a main body member extending in the vehicle width direction, and both ends of the main body member in the vehicle width direction are brackets of the plate material. The bracket has a U-shape that protrudes inward in the vehicle width direction, and a bead extending in the vertical direction is formed at a plurality of locations in the vehicle front-rear direction on the side of the bracket. ing. In addition, specifically, the bracket is configured by connecting a vehicle body side mounting flange portion and an auxiliary bumper side mounting portion to be attached to the body member side of the auxiliary bumper by a connecting member having a vertical plate surface, The connecting member is formed with the bead.
Therefore, according to the present invention, deformation of the bracket at the time of low-speed collision is likely to occur starting from the bead, and the deformation function of the bracket in the left-right direction (vehicle width direction) is increased, thereby The impact force can be reliably absorbed by the bracket.
Further, since the bead is formed only on the side portion of the bracket and the bead is not formed on the upper and lower members, the bending due to the collision of the colliding object as described above is suppressed while suppressing the vertical deformation of the bracket. The avoidance effect can be maintained.

  Further, in the present invention, the bracket is formed by extending an auxiliary bumper side mounting portion to be mounted on the main body member side of the auxiliary bumper from the joint portion to the connecting member inward in the vehicle width direction, and the planar shape of the bracket Has a substantially U-shape projecting to the inside of the vehicle body, so that the rigidity of the vehicle body side mounting flange is increased on the inside of the vehicle body, which is effective for deformation starting from the bead of the bracket during low-speed collisions. Can be converted to

  Further, in the present invention, since the reinforcement portion is provided at the connecting portion to the body member side and the connecting portion to the vehicle body side of the bracket, the distance between the auxiliary bumper and the vehicle body is large. If the rigidity of the bracket, which is a mounting member for the auxiliary bumper, tends to decrease and the reinforcement strength exists on both sides of the bracket, the thickness of the intermediate part of the bracket Thus, only the support strength of the bracket can be increased without lowering the deformation function of the bracket at the time of collision.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
FIG. 1 is a schematic perspective view seen from an oblique front of an automobile to which the front bumper structure of the present invention is applied, and FIG. 2 is an external perspective view showing the front part skeleton structure of the automobile according to the embodiment of the present invention. 3 is a perspective view of the engine room of the automobile, and FIG. 4 is a bottom view of the engine room of the automobile as viewed from below.
1 to 4, 100 is a vehicle body, 201 is a front portion of the vehicle body 100, 300 is an engine room, 1 is a main bumper for high-speed collision provided in the front portion 201, and 103 is a main bumper 1 to the vehicle body 1. It is a mounting bracket.
The front part 201 is provided with a pedestrian protection bumper 2 as an auxiliary bumper separately from the main bumper 1, and the pedestrian protection bumper 2 is connected to the front part 102 of the vehicle body via a pair of left and right brackets 3. Installed on. Moreover, the pedestrian protection bumper 2 is provided at a location below the main bumper 1 and on the vehicle front side relative to the main bumper 1. Also, in the engine room 300, there are functional components such as a radiator and a condenser 301 located on the vehicle rear side of the main bumper 1 and the pedestrian protection bumper 2, and an engine 302 located on the vehicle rear side of the radiator and the condenser 301. The functional component is suppressed from being deformed by the main bumper 1 or the like with respect to the impact load at the time of collision.
The front bumper structure according to the embodiment of the present invention relates to the structure and mounting structure of such a pedestrian protection bumper 2 and bracket 3.

FIG. 5 is an external perspective view of a pedestrian protection bumper according to an embodiment of the present invention from an oblique front, FIG. 6 is an external perspective view of the pedestrian protection bumper from an oblique rear, and FIG. The top view of the bumper for a pedestrian protection, (B) is the bottom view. FIG. 8 is a front view of the pedestrian protection bumper (viewed from the front of the vehicle), and FIG. 9 is an enlarged view of part C in FIG. 8 showing details of the pedestrian protection bumper. Further, FIG. 10 shows details of the bead portion of the pedestrian protection bumper, (A) is an external perspective view of the pedestrian protection bumper from an oblique front, (B) is an enlarged view of the E portion in (A), (C) is a ZZ line sectional view in (B).
5 to 10, the pedestrian protection bumper 2 is formed in a gentle arch shape in plan view such that the vicinity of the center portion is located in front of the vehicle rather than the left and right end portions in the vehicle width direction. The main body members 6 and 7 are arranged by overlapping two pipes extending in the width direction in the vertical direction, and the absorber 4 is welded and joined to the upper and lower surfaces of the main body members 6 and 7. .

As shown in FIG. 10 (C), the absorber 4 is formed by bending a plate material into a shape having a triangular shape in a transverse direction, the tip is curved in an arc shape, and the base is above the body members 6 and 7. It is welded and joined to the lower surface and protrudes from the main body members 6 and 7 to the front of the vehicle, and the collision object 101 (see FIG. 14) collides with the tip.
A plurality of beads 5 extending in the front-rear direction of the absorber 4 are formed on the upper surface of the absorber 4 at predetermined intervals along the vehicle width direction. As specifically shown in FIG. 10, these beads 5 are wide at the joint portion side between the absorber 4 and the main body members 6, 7 in a planar shape, and become narrower toward the vehicle front side of the absorber 4. It is formed in such a substantially triangular shape. Such a bead 5 can also be formed in a rectangular shape having a constant width extending in the vehicle front-rear direction.

FIG. 11 is an exploded perspective view of the body member and the bracket of the bumper for protecting pedestrian according to the embodiment of the present invention. 12 shows details of the bracket mounting portion of the pedestrian protection bumper, (A) is an external perspective view of the pedestrian protection bumper obliquely from the front, and (B) is an enlarged perspective view of the bracket mounting portion. It is a Y section enlarged view in (A). 13 shows details of the bracket for the pedestrian protection bumper, (A) is a view as viewed from the arrow W in FIG. 12 (B), (B) is a view as viewed from the arrow V in FIG. ) Is a view taken in the direction of arrow S in (A), and (D) is a cross-sectional view taken along the line TT in (A) (showing a skeleton).
11 to 13, the bumper 2 for protecting the pedestrian 2 is attached to the bracket 3 at both ends in the vehicle width direction. Each bracket 3 is bolted to the mounting flange 3a at the rear portion to tighten the front portion 102 of the vehicle body. (See FIGS. 2 and 3).

As shown in detail in FIGS. 13A to 13D, the bracket 3 includes a vehicle body side mounting flange 3a portion having a large outer shape to be mounted on the vehicle body 100 side, and the body members 6 and 7 side of the pedestrian protection bumper 2. And a bumper side mounting portion 3b having a small outer shape welded and joined to each other by a connecting member 3c having a substantially U-shaped cross section having a plate surface in the vertical direction.
In addition, beads 31 and 32 are formed on the connecting member 3c of the bracket 3, and the beads 31 and 32 extend in the vertical direction of the connecting member 3c and are spaced apart in the vehicle front-rear direction (this position). In the embodiment, it is formed at two locations).
Further, as shown in FIGS. 13 (A), (B), (C), and (D), the bracket 3 has a bumper side attachment portion 3b attached to the main body members 6 and 7 for joining to the connecting member 3c. Is formed to extend inward in the vehicle width direction.

  17 and 18 are a plan view and a side view for explaining the action at the time of collision of the pedestrian protection bumper according to the embodiment of the present invention. In addition to the above configuration, the planar shape of the bracket 3 protrudes toward the inside of the vehicle body. With the substantially U-shaped, the rigidity inside the vehicle body in the vicinity of the bumper-side mounting lunge 3b is increased. Therefore, as shown in FIGS. 17 and 18, the pedestrian protection bumper 2 and the bracket 3 are deformed as 2s, 3s, and 3z in the figure during a low-speed collision, and the impact force is applied to the outside of the vehicle body. Escape can be suppressed, and this can be effectively converted into deformation starting from the beads 31 and 32 of the bracket 3, so that load absorption during low-speed collision can be prevented.

In addition, as shown in FIGS. 11 to 13, reinforcing reinforcements 9 and 8 are provided at the connecting part to the body members 6 and 7 side of the bracket 3 and the connecting part to the vehicle body 100 side in the above embodiment. It has been. The bracket 3 is formed with a vehicle body side flange 3a and a bumper side mounting portion 3b.
In this way, the reinforcement portions 9 and 8 for reinforcement are provided on the connecting portion to the body members 6 and 7 side of the bumper 2 for protecting the pedestrian of the bracket 3 and the connecting portion to the vehicle body side. Even when the distance between the pedestrian protection bumper 2 and the vehicle body 100 is large and the length of the bracket 3 is increased, the rigidity of the bracket 3 which is an attachment member of the pedestrian protection bumper 2 is reduced, and it is likely that Reinforcing reinforcements 9 and 8 are present on both front and rear sides of the bracket 3, the thickness of the intermediate portion of the bracket 3 is increased, and the deformation function of the bracket 3 at the time of collision is not deteriorated. Only the support strength of 3 can be increased.

Next, FIGS. 14 and 15 are schematic diagrams for explaining the action at the initial stage of the collision of the bumper 2 for protecting pedestrian according to the embodiment of the present invention, and FIG. 16 is a schematic diagram for explaining the action after the collision.
In the front bumper structure according to the embodiment of the present invention, a pedestrian protection bumper 2 is provided on the front portion 201 of the vehicle body 100 at a lower part of the main bumper 1 and on the vehicle front side of the main bumper 1. An absorber 4 formed by bending a plate material is connected to the front side of the body members 6 and 7 of the bumper 2, and beads 5 extending in the front-rear direction are formed on the upper surface of the absorber 4 at predetermined intervals along the vehicle width direction. As a result, the rigidity in the vehicle front-rear direction on the upper surface of the absorber 4 is increased, and as shown in FIGS. 14 to 16, the pedestrian or the like collides with a collision object 101 having a bent portion in the vertical direction. The upward deformation of the pedestrian protection bumper 2 is suppressed, and the bending due to the collision of the collision object 101 as in the prior art shown in FIG. 19 can be reduced. Kill.

  In addition to that, the bead 5 is formed in a substantially triangular shape so that the bead 5 is wide in the planar shape at the joint portion between the absorber 4 and the body members 6 and 7 and becomes narrower toward the front side of the absorber 4. A narrow portion on the front side of the absorber 4 having a small rigidity at the initial stage of the collision with the colliding object 101 while preventing the bending due to the collision of the colliding object 101 by suppressing the upward deformation of the bumper 2 for protecting the pedestrian. By deforming, it is possible to absorb and mitigate the impact on the collision object 101 in the initial stage of the collision.

  Further, at the time of low-speed collision with the objective, impact force is input near the center of the body members 6 and 7 of the bumper 2 for protecting the pedestrian, but since the body members 6 and 7 are curved, instantaneously A force acts outward at the tip of the bracket 3, and this force causes the bracket 3 to be bent outward from the beads 31 and 32, thereby absorbing the transmission of impact force to the vehicle body during a low-speed collision.

That is, according to this embodiment, the connecting member 3c that connects the vehicle body side mounting flange 3a of the bracket 3 and the bumper side mounting portion 3b to the body members 6 and 7 of the pedestrian protection bumper 2 in the vehicle longitudinal direction. By forming the beads 31 and 32 extending in the vertical direction at a plurality of locations, deformation of the bracket 3 at the time of low-speed collision is likely to occur starting from the beads 31 and 32, and the bracket 3 is deformed in the left-right direction (vehicle width direction). The function can be increased and the impact force on the collision object 101 can be reliably absorbed by the bracket 3.
Further, since the beads 31 and 32 are formed only on the side portion of the connecting member 3c in the bracket 3 and the beads are not formed on the upper and lower members, the collision object 101 is suppressed while suppressing the vertical deformation of the bracket 3. It is possible to maintain the effect of avoiding the bending caused by the collision.
This structure is effective even when the bracket 3 is deformed in a small amount at the time of collision with a collision object 101 having a bent portion in the vertical direction such as a pedestrian. That is, by limiting the deformation of the bracket 3 in the vehicle width direction, the operating point of the absorber 4 does not move upward, and the required impact absorbing effect as the pedestrian protection bumper 2 can be obtained.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

1 is a schematic perspective view of an automobile to which a front bumper structure according to an embodiment of the present invention is applied, viewed from an oblique front. It is an external appearance perspective view from the diagonal front which shows the front part frame structure of the motor vehicle concerning the embodiment of the present invention. It is a perspective view of the engine room of the above-mentioned car. It is the bottom view which looked at the engine room of the above-mentioned car from the lower part. It is an external appearance perspective view from the slanting front of the bumper for pedestrian protection concerning the embodiment of the present invention. It is an external appearance perspective view from the diagonally backward of the said pedestrian protection bumper. (A) is the top view of the said bumper for pedestrian protection, (B) is the bottom view. It is a front view (figure seen from the vehicle front) of the above-mentioned pedestrian protection bumper. It is the C section enlarged view of FIG. 8 which shows the detail of the said pedestrian protection bumper. The detail of the bead part of the said pedestrian protection bumper is shown, (A) is the external perspective view from the diagonal front of the pedestrian protection bumper, (B) is the E section enlarged view in (A), (C) is ( It is a ZZ line sectional view in B). It is a disassembled perspective view of the main body member and bracket of the said pedestrian protection bumper. The detail of the bracket attaching part of the said pedestrian protection bumper is shown, (A) is an external perspective view from the diagonal front of the pedestrian protection bumper, (B) is an enlarged perspective view of the bracket attaching part (Y in (A)) Part enlarged view). The detail of the bracket of the said bumper for a pedestrian protection is shown, (A) is a W arrow view in FIG.12 (B), (B) is a V arrow view in FIG.12 (B), (C) is (A). FIG. 4D is a cross-sectional view taken along the line TT in (A) (showing the skeleton). It is the side schematic diagram (the 1) explaining the effect | action at the time of the collision of the bumper for pedestrian protection which concerns on embodiment of this invention. It is the side surface schematic diagram (2) explaining the effect | action at the time of the collision of the bumper for pedestrian protection which concerns on embodiment of this invention. It is the side surface schematic diagram (the 3) explaining the effect | action at the time of the collision of the bumper for pedestrian protection which concerns on embodiment of this invention. It is a top view explaining the effect | action at the time of the collision of the bumper for pedestrian protection which concerns on embodiment of this invention. It is a side view explaining the effect | action at the time of the collision of the pedestrian protection bumper which concerns on embodiment of this invention, and shows the deformation | transformation state of a bracket. It is the side surface schematic explaining the effect | action at the time of the collision of the bumper for pedestrian protection in a prior art. It is an external appearance perspective view from the diagonally forward of the bumper for pedestrian protection based on a prior art. An example of the bumper for a pedestrian protection which concerns on a prior art is shown, (A) is a principal part external appearance perspective view of a bumper for a pedestrian protection, (B) is the NN sectional view taken on the line in (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Car body 101 Colliding object 201 Front part 1 Main bumper 2 Pedestrian protection bumper (auxiliary bumper)
3 Bracket 3a Car body side mounting flange 3b Bumper side mounting part 3c Connecting member 4 Absorber 5 Bead 6, 7 Body member 8, 9 Reinforce 31, 32 Bead

Claims (4)

  In a vehicle front bumper structure in which an auxiliary bumper is provided at a front part of a vehicle body at a front part of a main bumper and a lower part of the main bumper and on the vehicle front side of the main bumper, the auxiliary bumper extends in the vehicle width direction. In addition, an absorber formed by bending a plate material is connected to the front side of the main body member, and beads extending in the front-rear direction of the absorber are formed at predetermined intervals along the vehicle width direction on the upper surface of the absorber. A front bumper structure for a vehicle, wherein a plurality of front bumper structures are formed.   The bead is formed in a substantially triangular shape that is wide in a planar shape at a joint portion side between the absorber and the main body member and becomes narrower toward a front side of the absorber. Item 2. A front bumper structure for a vehicle according to Item 1.   In a vehicle front bumper structure in which an auxiliary bumper is provided at a front part of a vehicle body at a front part of a main bumper and a lower part of the main bumper and on the vehicle front side of the main bumper, the auxiliary bumper extends in the vehicle width direction. In addition, it is configured by connecting an absorber formed by bending a plate material on the front side of the main body member, and both end portions in the vehicle width direction of the main body member are supported by the vehicle body via brackets of the plate material, A front bumper structure for a vehicle, wherein the bracket has a U-shape projecting inward in the vehicle width direction, and beads extending in the vertical direction are formed at a plurality of locations in the vehicle front-rear direction on a side portion of the bracket. .   4. The vehicle according to claim 3, wherein the bracket is formed by extending an auxiliary bumper side attachment portion attached to a main body member side of the auxiliary bumper from a joint portion to the connecting member inward in the vehicle width direction. Front bumper structure.

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