JP5931367B2 - Vehicle energy absorbing beam and method of mounting the same - Google Patents

Description

The present invention relates to a vehicle energy absorption beam provided in a vehicle, extending in a direction intersecting with an impact load input direction, and having both ends supported by predetermined portions of the vehicle, and a method of mounting the same .

  Vehicles such as automobiles are required to further improve safety in a side collision. For example, a door provided on a side portion of the vehicle extends in the vehicle front-rear direction in a space portion between the outer panel and the inner panel of the door in order to sufficiently absorb energy input at the time of collision and reduce deformation. One having an energy absorbing beam formed by a hollow pipe is known.

  This energy absorbing beam is generally a cylindrical one made of steel or the like, and its strength is improved by heat treatment after pipe making, but since this beam extends linearly, the outer shape of the door outer panel Can not be placed along. For this reason, a bracket for ensuring a constant gap with the outer panel is required at the end of the energy absorbing beam, resulting in an increase in cost and weight. In addition, a flat bracket is provided on the beam non-input surface side to receive impact load with the beam and efficiently transmit it to the pad provided in the door to improve the injury value. Was inviting.

  In view of this, there have been proposed energy-absorbing beams that are formed by press-molding a strip-shaped steel plate that is relatively lightweight and has a high degree of freedom in forming a cross-sectional shape, and that that is formed by extruding a resin material.

  In order to improve the strength against an impact load, such an energy absorbing beam extends in the longitudinal direction of the beam and protrudes in the input direction side of the impact load and has a projecting portion with a semicircular tip in the beam width direction. Side by side, or extending in the longitudinal direction of the beam and projecting toward the input direction of the impact load, the cross-sectional shape is formed in a substantially equilateral triangle, and the two plates are moved left and right from the top of the equilateral triangle toward the center of the bottom. Are formed so as to form a column plate portion in a superposed state (see Patent Document 1 and Patent Document 2).

  On the other hand, for the bumper beam of a vehicle where energy absorption performance is a problem, as in the case of the energy absorption beam in the door, a box-shaped chamber in which a rectangular space is formed in the cross section is formed by molding a belt-shaped rope. Vertically intermediate portions of a pair of side surfaces extending in the vertical direction by cooling and forming after forming a space portion having a rectangular shape in sectional view by extruding and molding a resin material inside There is known a case in which a bent portion having a convex inside is provided in a box shape (see Patent Document 3 and Patent Document 4).

Japanese Patent Laid-Open No. 2003-94943 Japanese Patent No. 3763858 JP-A-11-91466 Japanese Patent No. 3699568

  In the energy absorbing beam described in Patent Document 1, the semicircular tip portion is not easily deformed. Therefore, for the impact load acting in the same direction as the projecting portion, the projecting portion is deformed to absorb the energy of the impact load. . However, when the direction of the impact load deviates from the projecting direction of the projecting portion, the projecting portion may be deformed all at once so that the projecting portion falls down, resulting in insufficient energy absorption.

  Further, the energy absorbing beam described in Patent Document 2 has high rigidity when an impact load along the support plate is applied to the top of the equilateral triangle. However, if the direction of the impact load is deviated, the energy absorption beam collapses all at once. There is a risk that the absorption of energy will be insufficient.

  In addition, the bumper beam described in Patent Documents 3 and 4 has a box-shaped portion in which a space portion is formed extending in the front-rear direction with respect to the traveling direction of the vehicle. The box-shaped part is crushed according to the magnitude of the impact load, and the energy of the impact load can be absorbed, but if the direction of the impact load deviates from the traveling direction of the vehicle, the box-shaped part There is a risk that it will collapse at once and energy absorption will be insufficient.

  In addition, those described in Patent Documents 1 to 4 have no description regarding the case where the direction of the impact load is shifted, and those combined with those described in Patent Documents 1 to 4 are affected by the impact load. When the direction is shifted, the impact energy cannot be absorbed sufficiently.

The present invention has been made in view of such problems, and a vehicle energy absorbing beam capable of sufficiently absorbing impact energy even when the direction of impact load acting on the energy absorbing beam is deviated, and a method of mounting the same. The purpose is to provide.

In order to achieve the above object, a vehicle energy absorbing beam of the present invention is provided on a vehicle (front left door 10 in the embodiment), extends in a direction intersecting with an impact load input direction, and both end portions of the vehicle A hollow energy absorption beam for a vehicle connected to a predetermined portion of the bottom of the vehicle, which extends in a direction intersecting the impact load input direction and from both ends in the width direction toward the impact load input direction. A pair of first side wall portions that extend for a while as they advance toward the front end side, and a pair that approaches from the front end portions of the pair of first side wall portions toward the impact load input direction and approaches for a time as they proceed toward the front end side. A pair of side walls having a second side wall, and a pair of first side walls extending linearly from the front end portions of the pair of second side wall portions toward the impact load input direction and proceeding to the front end side . side wall portions and a pair of second And a pair of top wall portions than the angle of the wall portion connected with briefly close a large angle, the connection portion between the first side wall and the second side wall portion, a bent portion which inwardly has a convex shape The bottom surface portion, the pair of side wall portions, and the pair of top wall portions are integrally formed so as to form one closed cross section as a whole (Claim 1).

Further, the present invention is a hollow vehicle energy absorption beam provided in a vehicle, extending in a direction intersecting with an impact load input direction, and having both ends connected to a predetermined part of the vehicle. A bottom surface portion extending in a direction intersecting the direction, a pair of first side wall portions extending from both end portions in the width direction of the bottom surface portion toward the impact load input direction, and approaching for a while as approaching the distal end side, and a pair of first side walls A pair of second side walls that approach each other at an angle that is smaller than the angle formed by the pair of first side walls as they extend from each front end of the one side wall toward the impact load input direction and proceed toward the front end. a pair of side wall portions comprising a pair of first side wall portions and the pair of second side wall with the progress extends toward the impact load input direction distally from the distal end of the second side wall portions of the pair Have an angle larger than the angle formed by the part A pair of top wall portions that are closely connected to each other, and a connection portion between the first side wall portion and the second side wall portion is bent so that the inside is convex, and a bottom surface portion, a pair of side wall portions, and a pair of top walls The wall portion is integrally formed so as to form one closed cross section as a whole (Claim 2).

The pair of top wall portion of the present invention is arranged in the shock load input direction, and as the bottom portion is disposed in an impact load input direction opposite side, while being installed in a vehicle, an energy absorbing beam for a vehicle When installed in a vehicle, the orientation of the center line passing through the center in the width direction of the bottom surface with respect to the horizontal plane connects the intersection of the center line and the bottom surface with the intersection of the top wall and the side wall. It is installed in the vehicle so as to be within the range of the angle formed by the imaginary line and the center line (claim 3).

  Further, the present invention is characterized in that both tip portions of the pair of top wall portions are connected via a curved surface portion (claim 4).

  Moreover, this invention is provided in the door of a vehicle, and both ends are connected to the predetermined site | part in a door (Claim 5), It is characterized by the above-mentioned.

  Moreover, the bottom face part of this invention is connected in a door by caulking (Claim 6).

  As described above, the energy absorbing beam for vehicles according to the present invention has the above-described characteristics, so that even when the direction of the impact load acting on the energy absorbing beam is deviated, the impact energy is sufficiently absorbed. Can do.

1 is a cross-sectional view in the width direction of a vehicle energy absorption beam according to an embodiment of the present invention. The outside perspective view of the front left door provided with the energy absorption beam for vehicles of the present invention is shown. The relationship between the resistance N against the impact load of the energy absorbing beam for vehicles of the present invention and the deformation stroke S is shown. FIG. 9A shows the action angle θ between the direction of the impact load and the center line of the energy absorbing beam for vehicles. The case of 0 degree is shown, and FIG. 7B shows the case where the acting angle θ of the impact load is 20 degrees. FIG. 4 is a diagram for explaining the operation of the energy absorbing beam for a vehicle according to the present invention when the operating angle θ is 20 degrees. FIG. 5A shows the case where the beam deformation stroke is s1, and FIG. The case where the stroke is s2 is shown, and FIG. 4C shows the case where the deformation stroke of the beam is s3.

  Hereinafter, a preferred embodiment of an energy absorbing beam for a vehicle according to the present invention will be described with reference to FIGS. First, an outline of a vehicle door provided with a vehicle energy absorption beam will be described with reference to FIG. In the present embodiment, a front left door disposed at the front left side in the vehicle width direction of the vehicle will be described as an example.

  As shown in FIG. 2 (perspective view), the front left door 10 includes a door body 1 that is supported by a front pillar disposed on the front left side of a vehicle body (not shown) via a hinge so as to be opened and closed. . The door body 11 is disposed on the outer side in the vehicle width direction and extends in the vehicle front-rear direction. The door main body 11 is opposed to the outer panel 12 with a predetermined gap on the inner side in the vehicle width direction. And an inner panel 13 extending in the direction.

  A space 14 is formed between the outer panel 12 and the inner panel 13. In this space portion 14, a door sash that guides the vertical movement of the window glass 16, a vehicle energy absorbing beam 30 of the present invention that can absorb energy at the time of a side collision, and a door that locks the front left door 10 to the body. A lock mechanism and the like are provided.

  Next, the structure of the vehicle energy absorbing beam 30 will be described with reference to FIGS. 1 and 2 (cross-sectional views). The vehicle energy absorbing beam 30 extends along the outer panel 12 from the front side to the rear side in the space portion 14 of the door main body 11, and the front side is positioned higher than the rear side in the space portion 14 of the door main body 11. In addition, it is arranged so as to incline upward as it goes forward. A front beam bracket 18 and a rear beam bracket 19 are attached to the front end portion and the rear end portion of the vehicle energy absorbing beam 30. These beam brackets are connected to the inner panel 13, and the vehicle energy absorbing beam 30 is supported on the inner panel 13 via the front beam bracket 18 and the rear beam bracket 19. Connection of the vehicle energy absorption beam 30 to the beam bracket will be described later.

As shown in FIG. 2, the vehicle energy absorbing beam 30 is formed by roll-forming high-tensile steel and is applied to the input direction of the impact load F that acts in a substantially horizontal direction from the side of the vehicle to the door body side. A bottom surface portion 31 extending in a direction orthogonal to each other, a pair of side wall portions 33 and 34 extending from both widthwise end portions of the bottom surface portion 31 toward the impact load input direction and approaching for a while as approaching the front end side, and a pair of side wall portions A pair of top walls that extend from the respective tip portions of 33 and 34 toward the impact load input direction and are close to each other at an angle larger than the angle formed by the pair of side wall portions 33 and 34 as proceeding to the tip side. The pair of side wall portions 33, 34 includes a pair of side wall portions 33, 34 that extend from both ends in the width direction of the bottom surface portion 31 toward the impact load input direction and approach the tip end side for a while and gradually approach each other. 33a, 34a and one First side wall 33a, briefly approached from the distal end of the 34a pair of first side wall portion 33a in accordance with extending toward the impact load input direction advances distally, it has a smaller angle than the angle of 34a in a pair of second side wall portions 33b you will have a 34b. A connecting portion between the first side wall portions 33a and 34a and the second side wall portions 33b and 34b forms a bent portion 39 that bends so that the inner side is convex, and includes a bottom surface portion 31, a pair of side wall portions 33 and 34, and a pair. The top wall portions 36 and 37 are integrally formed so as to form one closed cross section as a whole.

  In the present embodiment, the first side wall portions 33a and 34a are inclined with an inclination angle α1 of about 37 degrees with respect to the center line L that passes through the center portion in the width direction of the bottom surface portion 31, and the second side wall portion 33b. , 34b are inclined with respect to the center line L with an inclination angle α2 of about 16, and the top wall portions 36, 37 are inclined with an inclination angle α3 of about 60 with respect to the center line L.

  Further, the curved surface portion 41 is provided between the pair of top wall portions 36 and 37, between the second side wall portions 33b and 34b and the top wall portions 36 and 37, and between the second side wall portions 33b and 34b and the bottom surface portion 31. Connected through. For this reason, it is possible to prevent a situation where the force acting between them is dispersed to easily buckle. The bent portion 39 also protrudes in a curved shape on the inside.

  In the vehicle energy absorption beam 30 configured as described above, the pair of top wall portions 36 and 37 are disposed outside the door body 11 in the width direction, and the bottom surface portion 31 is disposed inside the door body 11 in the width direction. Thus, it is installed in the door body 11. For this reason, since the bottom surface portion 31 is disposed so as to face the inner panel 13, the bottom surface portion 31 can be disposed opposite to a pad (not shown) provided in the door body 11, and the vehicle energy The necessity of providing a planar bracket on the non-input surface side of the absorption beam 30 is eliminated.

  Next, the relationship between the resistance N against the impact load F and the deformation stroke S when the impact load F acts on the vehicle energy absorbing beam 30 of the present invention will be described with reference to FIG. 3A, the impact load F (see FIG. 1) acts on the curved surface portion 41 connecting the pair of top wall portions 36 and 37, and the acting direction is along the center line L of the vehicle energy absorbing beam 30. 3 (b) shows a case where the working angle θ of the impact load F ′ (see FIG. 1) is inclined by about 20 ° with respect to the impact load F ′. Yes.

  As shown in FIG. 3A, when the deformation stroke S is increased from zero to s1 and s2 by the impact load F, the vehicle energy absorption beam 30 increases when the drag N increases and the deformation stroke S exceeds s2. The drag N is slightly smaller than the drag corresponding to s2. Here, s1, s2, and s3 indicate different deformation strokes S, and have a relationship of 0 <s1 <s2 <s3. That is, the vehicle energy absorption beam 30 expands outward as the top wall portions 36 and 37 and the side wall portions 33 and 34 (the first side wall portions 33a and 34a and the second side wall portions 33b and 34b) proceed to the bottom surface side. In addition, a convex bent portion 39 is provided on the inner side between the first side wall portions 33a and 34a and the second side wall portions 33b and 34b. When the impact load F acts on the top wall portions 36, 37 and the first side wall portions 33a, 34a with the bent portion 39 as a fulcrum at the initial stage of the impact load F, the top wall portions 36, 37 and The side wall portions 33 and 34 are bent to support the impact load F. Each wall portion is connected via a curved surface portion 41. For this reason, even if the impact load F acts on the energy absorbing beam 30 for the vehicle, the energy absorbing beam 30 for the vehicle is not crushed at a stretch, and the displacement of the impact load F accompanying the elastic deformation of the top wall portions 36, 37, etc. Can be absorbed as impact energy.

  Further, as shown in FIG. 3B, the vehicle energy absorbing beam 30 acts at a position where the acting angle θ of the impact load F ′ is inclined about 20 degrees with respect to the center line L of the vehicle energy absorbing beam 30. Then, the drag N increases as the deformation stroke S increases from zero to s1 due to the impact load F ′. When the deformation stroke S exceeds s1, the drag N decreases for a while, and when the deformation stroke S is s2, the deformation stroke S Is approximately the same as that at s1, and when the deformation stroke S is s3, the deformation stroke S is reduced to about half of that at s2. In this embodiment, when the operating angle θ is 20 degrees, as shown in FIG. 1, the center line L intersects the bottom surface portion 31 when the vehicle energy absorption beam 30 is viewed from the longitudinal direction. This is the angle formed by the imaginary line K connecting the intersection point Q and the intersection point R of the top wall portions 36, 37 and the second side wall portions 33b, 34b with respect to the center line L.

  FIG. 4 shows a process of deformation of the vehicle energy absorption beam 30 in a sectional view when the impact load F ′ acts on the vehicle energy absorption beam 30. FIG. 4A shows a state of deformation of the vehicle energy absorption beam 30 when the deformation stroke S of the vehicle energy absorption beam 30 is s1 (see FIG. 3B), and FIG. The deformation stroke of the vehicle energy absorption beam 30 is shown when the deformation stroke of the vehicle energy absorption beam 30 is s2 (see FIG. 3B), and FIG. The mode of the deformation | transformation of the energy absorption beam 30 for vehicles at the time of s3 (refer FIG.3 (b)) is shown. When the impact load F ′ directed in the same direction as the imaginary line K passing through the intersections Q and R acts on the front end side of the vehicle energy absorption beam 30 as described above, FIGS. 4 (a), 4 (b), FIG. 4 (c), the second side wall part 34b is bent and deformed toward the bottom surface part 31 with the bent part 39 as a fulcrum, and the curved surface part 41 that is a connection part between the first side wall part 33b and the bottom surface part 31 is used as a fulcrum. As a result, the first side wall portion 33b is bent and deformed toward the bottom surface portion 31, and absorbs the energy of the impact load F ′.

  On the other hand, the top wall portion 36 and the side wall portion 33 on the other side of the energy absorbing beam 30 for the vehicle bend to the other side with the curved surface portion 41 that is a connection portion with the bottom surface portion 31 as a fulcrum. For this reason, the top wall part 36 and the side wall part 33 which were enclosed with the cyclic | annular broken line of the other side are maintained in the state which stood up from the bottom face part 31, without being crushed. Therefore, all of the energy of the impact load F ′ can be absorbed.

  As described above, the vehicle energy absorption beam 30 according to the present invention is not limited to the direction in which the operating angle θ of the impact load F is along the center line L, but also the angle at which the operating angle θ is deviated from the center line L (in this embodiment). Even when the working angle θ is about 20 degrees, the impact energy of the impact loads F and F ′ can be absorbed. For this reason, even when the direction of the impact input load acting on the door body 11 is deviated, the energy of the impact load can be absorbed.

  Further, when the vehicle energy absorbing beam 30 according to the present invention is installed in the door body 11, even if the direction of the center line L of the vehicle energy absorbing beam 30 is shifted in the vertical direction with respect to the horizontal plane, the amount of shift is approximately If it is within the range of 20 degrees, the energy of the impact load from the side surface of the vehicle can be absorbed. For this reason, the precision which attaches to the door main body 11 of the energy absorption beam 30 for vehicles can be made low, and an assembly operation can be made easy.

  The bottom surface portion 31 of the vehicle energy absorption beam 30 is formed in a flat shape. For this reason, the bottom surface 31 may be attached to the front beam bracket 18 or the rear beam bracket 19 by caulking. If the vehicle energy absorbing beam 30 can be attached to the inner panel 13 without the front beam bracket 18 and the rear beam bracket 19, the vehicle energy absorbing beam 30 is directly caulked to the inner panel 13. It may be attached.

  In the above-described embodiment, the top wall portions 36 and 37, the first side wall portions 33a and 34a, and the second side wall portions 33b and 34b are linearly extended, but are formed to be curved outward. It may be a thing.

  Moreover, although the case where the vehicle energy absorption beam is provided in the front left door 10 has been described in the above-described embodiment, the vehicle energy absorption beam is provided on the front rear door, the front right door, and the rear right door of the vehicle. May be provided. Moreover, you may provide the energy absorption beam for vehicles in the front part other than the door of a vehicle, a rear part, and a side part.

10 Front left door (vehicle door)
DESCRIPTION OF SYMBOLS 30 Vehicle energy absorption beam 31 Bottom surface part 33 Side wall part 33a, 34a 1st side wall part 33b, 34b 2nd side wall part 36, 37 Top wall part 39 Bending part 41 Curved part K Virtual line L Center line O Working angle (angle)
Q, R intersection

Claims (6)

A hollow vehicle energy absorbing beam provided in the vehicle, extending in a direction intersecting the impact load input direction, and having both ends connected to a predetermined portion of the vehicle,
A bottom surface extending in a direction intersecting the impact load input direction;
A pair of first side wall portions extending from both ends in the width direction of the bottom surface portion toward the impact load input direction side and approaching for a while as they proceed toward the tip end side, and impact load input from the tip ends of the pair of first side wall portions A pair of second side wall portions extending toward the direction side and approaching for a while as they proceed toward the front end side, and a pair of side wall portions,
More than the angle formed by the pair of first side walls and the pair of second side walls as it extends linearly from the front ends of the pair of second side walls toward the impact load input direction and proceeds toward the front end. A pair of top wall portions that have a large angle and are connected to each other for a while,
Forming a bent portion with a convex inner side at a connecting portion between the first side wall and the second side wall;
The vehicle energy absorbing beam, wherein the bottom surface portion, the pair of side wall portions, and the pair of top wall portions are integrally formed so as to form one closed cross section as a whole. A hollow vehicle energy absorbing beam provided in the vehicle, extending in a direction intersecting the impact load input direction, and having both ends connected to a predetermined portion of the vehicle,
A bottom surface extending in a direction intersecting the impact load input direction;
A pair of first side wall portions extending from both ends in the width direction of the bottom surface portion toward the impact load input direction side and approaching for a while as they proceed toward the tip end side, and impact load input from the tip ends of the pair of first side wall portions A pair of side wall portions that extend toward the direction side and have a pair of second side wall portions that approach each other at an angle that is smaller than an angle formed by the pair of first side wall portions as it advances toward the distal end side. When,
An angle larger than the angle formed by the pair of first side wall portions and the pair of second side wall portions extends from the front end portions of the pair of second side wall portions toward the impact load input direction side and proceeds toward the front end side. And a pair of top wall portions that are connected to each other for a while,
The connecting portion between the first side wall and the second side wall is bent so that the inside is convex,
The vehicle energy absorbing beam, wherein the bottom surface portion, the pair of side wall portions, and the pair of top wall portions are integrally formed so as to form one closed cross section as a whole. The pair of top wall portions are disposed on the side of the impact load input direction, and the bottom surface portion is disposed on the opposite side of the impact load input direction.
When the vehicle energy absorption beam is installed in the vehicle, the direction of the center line that passes through the center part in the width direction of the bottom part perpendicular to the horizontal plane intersects the center line and the bottom part, and It is installed in the said vehicle so that it may become in the range of the angle which the imaginary line which connects the intersection of a top wall part and the said side wall part, and the said centerline. The vehicle for vehicles of Claim 1 or 2 characterized by the above-mentioned. Energy absorbing beam. 4. The vehicle energy absorbing beam according to claim 1, wherein both end portions of the pair of top wall portions are connected via a curved surface portion. 5. The vehicle energy absorbing beam according to any one of claims 1 to 4, wherein the vehicle energy absorbing beam is provided in a door of the vehicle, and both ends thereof are connected to predetermined portions in the door. The method for mounting an energy absorbing beam for a vehicle according to claim 5, wherein the bottom surface portion is connected to the inside of the door by caulking.

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