JP2012206531A - Shock absorption member of bumper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorption member of a bumper which is capable of surely absorbing a shock even in the contact of a corner part with a pedestrian etc to reduce the influence on the pedestrian etc.SOLUTION: The shock absorption member 20 of the bumper 1 is made from a metal plate and has: an upper side horizontal surface 22 and a lower side horizontal surface 23 which are extended along the front surface of a bumper beam 10; an upper side inclined surface 24; a lower side inclined surface 25; and the front surface 26. Here, a nearly rhombic shape bead 30 having a flat front surface part 31 and side surface parts 32, 33 and extended in the vertical direction is formed in a corner part 1A. Upon contact with the pedestrian etc, the bend deformation of the upper side horizontal surface 22 and the lower side horizontal surface 23 is induced with the deformation of the front surface 31 of the bead 30 and the upper side horizontal surface 22 and the lower side horizontal surface 23 are smoothly crushed and deformed to reduce the harm damage affecting the pedestrian.

Description

  The present invention relates to an impact absorbing member for a bumper, and more particularly to an impact absorbing member for a bumper that can reduce obstacle damage to a pedestrian or the like when contacting the pedestrian or the like.

  2. Description of the Related Art Various types of automobile bumpers that reduce obstacle damage to pedestrians when contacting pedestrians have been proposed.

  An example of this type of bumper will be described with reference to a cross-sectional perspective view of relevant parts shown in FIG.

  The bumper 100 includes a bumper beam 101 having a substantially rectangular hollow closed cross-sectional structure that is supported by left and right side frames via impact reducing members and extends in the vehicle width direction, an impact absorbing member 102, and a bumper face 109.

  The shock absorbing member 102 is made of a relatively thin metal plate and has a plate-like rear surface 103 facing the bumper beam 101. The shock absorbing member 102 is coupled to the upper portion 103a and the lower portion 103b of the rear surface 103 and extends oppositely in the vehicle width direction. The upper horizontal surface 104 and the lower horizontal surface 105, the upper inclined surface 106 extending obliquely forward and downward along the front edge of the upper horizontal surface 104, and the lower inclination extending obliquely forward and upward along the front edge of the lower horizontal surface 105 The surface 107 and the rear surface 103 are opposed to each other, and a closed cross-sectional shape having a front surface 108 whose upper edge is continuous with the front edge of the upper inclined surface 104 and whose lower edge is continuous with the front edge of the lower inclined surface 107 is configured. The bumper face 109 is made of synthetic resin and covers the shock absorbing member 102.

  In the bumper 100, a central portion range 100A in the vehicle width direction is linear along the vehicle width direction, and an inclined portion range 100B that is bent from the both ends of the central portion range 100A at the corner portion 100C and gently extends obliquely to the rear vehicle exterior. Have.

  In the case of a light collision in which the center range 100A is in contact with a pedestrian's leg or the like while traveling at low speed, the impact load F1 is transmitted to the front surface 108 of the impact absorbing member 102 via the bumper face 109, and the impact absorbing member 102. The upper horizontal plane 104 and the lower horizontal plane 105, in which loads concentrate between the bumper beam 101 and the rear end edges are connected by the rear surface 103, have a central portion in the front-rear direction along the extending direction of the central range 100A. The obstacle damage to the pedestrian is reduced by crushing and deforming so as to protrude as the first convex ridgelines 104a and 105a and absorbing the impact load F1. On the other hand, when the inclined portion range 100B comes into contact with a pedestrian or the like at low speed, the impact load F2 is transmitted to the front surface 108 of the impact absorbing member 105 via the bumper face 109, and the upper horizontal plane 104 and the lower horizontal plane 105 are transmitted. However, the damage to the pedestrian is reduced by collapsing and deforming so that the center part protrudes as the second convex fold lines 104b and 105b along the extending direction of the inclined range 100B and absorbing the impact load.

  Further, as shown in FIG. 9, the bumper disclosed in Patent Document 1 is provided with an impact reduction member 112 formed in a box shape of a hollow closed cross section made of a metal plate provided at the tip of the left and right side members 111. The attached bumper reinforcement 113 has a rectangular closed cross-sectional structure including an upper surface portion 114, a bottom surface portion 115, a front surface portion 116, and a rear surface portion 117 formed by aluminum extrusion, and the inside of the closed cross section is partitioned vertically. A reinforcing portion 118 is provided, and a punched hole 119 is provided in the vicinity of the coupling portion with the impact reducing member 112 so as to penetrate the upper surface portion 114, the reinforcing portion 118, and the bottom surface portion 115 vertically. Thereby, at the time of a vehicle collision, the impact load is absorbed and the deformation of the side member 111 is suppressed by the formation portion of the punch hole 119 of the bumper reinforcement 113 and the impact relaxation member 112.

JP 2008-110679 A

  According to the shock absorbing member 102 of the bumper 100, when the central area 100A comes into contact with a pedestrian or the like at low speed, the upper horizontal surface 104 and the lower horizontal surface 105 of the shock absorbing member 102 are respectively first convex ridge lines 104a. And it deforms so that it may protrude along 105a, absorbs an impact load, and makes obstacle damage to a pedestrian small. On the other hand, when the inclined portion range 100B comes into contact with a pedestrian or the like, the upper horizontal surface 104 and the lower horizontal surface 105 of the shock absorbing member 102 are crushed and deformed so as to protrude along the second convex ridge lines 104b and 105b, respectively. By absorbing the impact load, the obstacle damage to the pedestrian is reduced.

  However, when the bumper 100 is in contact with a pedestrian or the like in the vicinity of the corner portion 100C that moves from the central portion range 100A side to the inclined portion range 100B side, the impact absorbing member 102 of the bumper face 109 is caused by the impact load F3. The load is transmitted to the front surface 108 so that the load is concentrated between the shock absorbing member 102 and the bumper beam 101 so that the upper horizontal plane 104 and the lower horizontal plane 105 protrude along the first convex ridgelines 104a and 105a in the central region 100A. And crushed and deformed so as to protrude along the second convex folded ridge lines 104b and 105b in the inclined portion range 100B.

  Here, since the front end edge of the corner portion 100C of the upper horizontal surface 104 has a substantially bow shape with respect to the impact load F3, when the front end edge is crushed and deformed while retracting with respect to the entrance of the impact load F3. The front end edge acts to straddle the impact load F3, compressive deformation occurs along the front end edge around the input portion of the impact load, and drag due to crushing deformation of the upper horizontal plane 104 increases. Similarly, in the lower horizontal plane 105, a crushing deformation that protrudes along the first convex folded ridge line 105a occurs and a crushing deformation that protrudes along the second convex folded ridge line 105b occurs, and the front edge of the corner portion 100C has an impact. Since the load F3 has a substantially bow shape, the front edge acts as a step on the impact load F3 when the front edge is crushed and deformed while retracting with respect to the impact load F3. Compressive deformation occurs along the front edge centering on the input portion of the impact load, and the drag due to the crushing deformation of the lower horizontal surface 105 increases.

  As a result, the smooth deformation of the shock absorbing member 102 in the corner portion 100C is hindered, and the drag due to the crushing deformation of the upper horizontal surface 14 and the lower horizontal surface 15 increases rapidly, so that good shock absorption cannot be obtained, and the impact on the pedestrian There is a concern that the mitigation will not be adequate. FIG. 8 shows the correlation between the deformation stroke S of the shock absorbing member 102 and the drag F at the corner portion 100C.

  According to Patent Document 1, a bumper reinforcement 113 is a rectangular closed cross-sectional structure having an upper surface portion 114, a bottom surface portion 115, a front surface portion 116, and a rear surface portion 117 formed by aluminum extrusion. Since the reinforcing portion 118 is provided and the strength and rigidity are high, there is a concern that shock absorption due to the crushing deformation of the bumper force 113 cannot be obtained at the time of a relatively light collision in contact with a pedestrian or the like at low speed. Is done.

  Further, the bumper reinforcement 113 is formed in an inclined portion range that is bent from both ends of the vehicle width central portion range and gently extends obliquely to the rear vehicle exterior, and the punched hole 119 is formed in the inclined portion range. When an impact load is input to the corner portion, the upper portion 114, the bottom portion 115, and the reinforcing portion 118 have a crush deformation direction mismatch between the central portion range side and the inclined portion range side, and the central portion range side is deformed. There is a concern that the crushing deformation on the slope portion side intersects and overlaps each other, interferes with each other, restrains the smooth crushing deformation, and increases the drag due to the crushing deformation.

  Accordingly, an object of the present invention made in view of such a point is that it is possible to absorb a shock even in a light contact with a pedestrian or the like in a corner portion of a bumper as well as a central range and an inclined portion range, and an obstacle to the pedestrian or the like. An object of the present invention is to provide a bumper shock absorbing member capable of reducing damage.

  The invention of the shock absorbing member for a bumper according to claim 1, which achieves the above object, includes a bumper beam supported by left and right side frames and extending in a vehicle width direction, and is made of a metal plate and extends along a front surface of the bumper beam. An upper horizontal plane and a lower horizontal plane, an upper inclined surface extending obliquely forward and downward through a first folding curve along the front edge of the upper horizontal plane, and a second folding curve along the front edge of the lower horizontal plane A lower inclined surface extending diagonally forward and upward via a top edge is continuous with the front edge of the upper inclined surface via a third folding line, and a lower edge is inclined to the lower side via a fourth folding curve An inclined portion range that is bent from the both ends of the central portion range extending along the vehicle width direction and having a front surface continuous with the front edge of the surface through the corner portions, and extends obliquely to the rear vehicle exterior. And the upper part in the central part range due to the impact load on the central part range. The upper horizontal plane and the lower horizontal plane are crushed and deformed along the extending direction of the central area as the first convex folded ridgeline to absorb the impact load, and the impact load to the inclined area is affected by the impact load on the inclined area. In the impact absorbing member of the bumper in which the upper horizontal plane and the lower horizontal plane are crushed and deformed with the center portion as the second convex ridge line along the extending direction of the inclined portion range to absorb the impact, the upper edge is the third folding line A front surface having a flat front surface extending along the fourth folding line and a pair of side surfaces extending along each side edge of the front surface. A bead extending in the vertical direction is formed with a U-shaped cross-section with an open side.

  According to this, in the case of a light collision in which the central area of the bumper contacts a pedestrian or the like at low speed, the front ends of the upper and lower horizontal surfaces of the shock absorbing member are pressed backwards to The center part of the front-rear direction along the extending direction is crushed and deformed so as to protrude as the first convex folded ridgeline to absorb the impact load and reduce the obstacle damage to the pedestrian. In addition, when the inclined part range comes into contact with a pedestrian or the like in low-speed traveling, the upper horizontal plane and the lower horizontal plane use the center part in the front-rear direction along the extending direction of the inclined part range as the second convex ridge line. By crushing and deforming so as to protrude, the impact load is absorbed to reduce the obstacle damage to the pedestrian.

  On the other hand, when the corner of the bumper comes into contact with a pedestrian or the like, a bead of the shock absorbing member is formed and transmitted to the front surface by the impact load, and the third fold between the front surface and the upper inclined surface is formed by the bead formation. Since the curve and the fourth fold curve between the front surface and the lower inclined surface are divided, and the front surface portion is formed in a flat shape and the rigidity strength is suppressed, it is easily crushed and deformed in the initial contact with the pedestrian. The drag due to the deformation of the shock absorbing material is greatly reduced, and further bending deformation of the upper horizontal plane and the lower horizontal plane is induced through the upper inclined surface and the lower inclined surface with the deformation of the front part of the bead. Thus, an appropriate deformation mode in which the upper horizontal plane and the lower horizontal plane are smoothly crushed and deformed is obtained, and obstacle damage to the pedestrian is reduced. Further, along with the optimization of the deformation mode with respect to the impact of the impact absorbing member, the impact absorbing member can be made compact and the mass can be reduced, and the bumper can be downsized and the manufacturing cost can be reduced.

  According to a second aspect of the present invention, in the impact absorbing member for a bumper according to the first aspect, the front surface portion gradually moves away from each end of the upper end edge to a central height position of the front surface. The upper side edge and the lower side edge of each upper side edge that come closer to each other as they descend from the lower end of each upper side edge are formed in a diamond shape. An upper side surface formed along the lower side surface and a lower side surface formed along the lower side edge continuously through the bent portion at the lower end of the upper side surface.

  According to this, since the rigidity strength of the center part in the vertical direction of the front surface where the bent portion of the side surface portion that is the maximum width of the bead is reduced, the front surface is easily deformed in the initial contact with the pedestrian, Shock absorption due to the crushing deformation of the upper horizontal plane and the lower horizontal plane is more efficiently performed, and obstacle damage to the pedestrian can be reduced.

  According to a third aspect of the present invention, in the impact absorbing member of the bumper according to the first aspect, the front surface portion is an upper side edge that gradually separates from the respective ends of the upper end edge, and the upper side edge. The upper horizontal edge that extends horizontally away from the lower end of the upper side, the side edge that extends downward from the side edge of the upper horizontal edge and faces each other, and the side end is continuous to the lower end of each side edge A lower horizontal edge extending in the horizontal direction so as to face the upper horizontal edge, and extending downward from the inner end of the lower horizontal edge and approaching each other as it descends, A central portion having a lower side edge reaching the end is formed in a substantially rhombus protruding in the horizontal direction, and each of the side surfaces is an upper side surface formed along the upper side edge and the upper horizontal edge of the front surface portion, the lower side On the lower side surface and the side edge formed along the side horizontal edge and the lower side edge It formed me and having a bent portion which connects the upper side and lower side.

  According to this, since the rigidity strength of the center portion in the vertical direction of the front surface of the shock absorbing member in which the bent portion of the side surface portion which is the maximum width of the bead is formed is greatly reduced, it is easy at the initial contact with the pedestrian. The front surface is deformed, and the shock absorption due to the crushing deformation of the upper horizontal surface and the lower horizontal surface is more efficiently performed, so that the obstacle damage to the pedestrian can be reduced.

  The invention according to claim 4 is the bumper impact absorbing member according to any one of claims 1 to 3, wherein the rear edge of the upper horizontal plane and the lower horizontal plane are connected by a rear surface. To do.

  According to this, the rear end edges of the upper horizontal plane and the lower horizontal plane are connected by the rear surface, so that the impact on the pedestrian is reduced by absorbing the impact by efficient and smooth crushing deformation of the upper horizontal plane and the lower horizontal plane. it can.

  According to the present invention, the crushing deformation is easily performed in the initial contact with the pedestrian, and the upper horizontal surface and the lower horizontal surface are bent through the upper inclined surface and the lower inclined surface with the deformation of the front surface portion of the bead, respectively. An appropriate deformation mode in which deformation is induced and the upper horizontal surface and the lower horizontal surface are smoothly crushed and deformed is obtained, and obstacle damage to a pedestrian is reduced. Further, along with the optimization of the deformation mode with respect to the impact of the impact absorbing member, the impact absorbing member can be made compact and the mass can be reduced, and the bumper can be downsized and the manufacturing cost can be reduced.

It is a principal part perspective view which shows the impact-absorbing member of the bumper in one Embodiment. It is the II section enlarged view of FIG. It is the III-III sectional view taken on the line of FIG. It is effect | action explanatory drawing which shows the deformation | transformation state of an impact-absorbing member. FIG. 6 is a correlation diagram between a deformation stroke S and a drag force F of an impact absorbing member in a corner portion. It is a figure which shows the bead shape of an impact-absorbing member. It is a principal part perspective view which shows the impact-absorbing member of the conventional bumper. FIG. 6 is a correlation diagram between a deformation stroke S and a drag force F of an impact absorbing member in a corner portion. It is a perspective view which shows the conventional bumper structure.

  An embodiment of a shock absorbing member for a bumper according to the present invention will be described with reference to FIGS.

  1 is a cross-sectional perspective view of a main part of a bumper 1 showing an outline of the present embodiment, FIG. 2 is an enlarged view of a II part of FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is effect | action explanatory drawing which shows the deformation | transformation state. FIG. 5 is a correlation diagram between the displacement S of the deformation stroke of the shock absorbing member and the drag F at the corner.

  The bumper 1 includes a bumper beam 10 having a substantially rectangular hollow closed cross-sectional structure having a front surface 11, a rear surface 12, an upper surface 13, and a lower surface 14 that are supported by left and right side frames via impact reduction members and extend in the vehicle width direction. The shock absorbing member 20 and the bumper face 50 are provided.

  The shock absorbing member 20 is made of a relatively thin metal plate and has a plate-like rear surface 21 that faces the front surface 11 of the bumper beam 10 and extends in the vehicle width direction along the front surface 11, and an upper portion 21 a and a lower portion of the rear surface 21. The rear end edges 22e and 23e are coupled to 21b and are opposed to each other and extend obliquely via the first folding line 20a along the upper horizontal plane 22 and the lower horizontal plane 23 extending in the vehicle width direction and the front edges of the upper horizontal plane 22 An upper inclined surface 24 that extends forward and downward, a lower inclined surface 25 that extends obliquely forward and upward via a second folding line 20b along the front edge of the lower horizontal surface 23, and an upper edge that faces the rear surface 21 Has a closed cross-sectional shape having a front surface 26 that is continuous with the front edge of the upper inclined surface 24 through the third folding line 20c and whose lower edge is continuous with the front edge of the lower inclined surface 25 through the fourth folding line 20d. Composed. Further, rear end edges 22 e and 23 e of the upper horizontal plane 22 and the lower horizontal plane 23 are coupled to the bumper beam 10. The bumper face 50 is made of synthetic resin and covers the front surface 26 of the shock absorbing member 20.

  The bumper 1 has a central portion range 1A in the vehicle width direction that is substantially linear along the vehicle width direction, and has an inclined portion range 1B that bends from both ends of the central portion range 1A and gently extends obliquely to the rear rear vehicle side. A range where the central range 1A is changed to the inclined range 1B is the corner 1C.

  In the corner portion 1 </ b> C, the impact absorbing member 20 has a planar front surface portion 31 and side surface portions 32, 33, and a bead 30 extending in the vertical direction is formed in a U-shaped cross section with the front side open. The front surface portion 31 of the bead 30 has an upper end edge 31a extending along the third folding line 20c to the upper inclined surface 24, and a lower end edge 31b extending along the fourth folding line 20d to the lower inclined surface 25, The upper side edges 31c and 31e that gradually move away from each end of the upper end edge 31a and reach the center height position of the front surface 26 and approach each other as they descend from the lower end of each upper side edge 31c and 31e. It is formed in a substantially rhombus having lower side edges 31d and 31f reaching the respective ends of the lower end edge 31b.

  The side surface portion 32 is formed along the lower side edge 31d continuously through the bent portion 32C at the upper side surface 32A formed along the upper side edge 31c of the front surface portion 31 and the lower end of the upper side surface 32A. A lower side surface 32B. The side surface portion 33 is formed along the lower side edge 31f continuously through the bent portion 33C on the upper side surface 33A formed along the upper side edge 31e of the front surface portion 31 and the lower end of the upper side surface 33A. It has a lower side surface 33B. That is, the side surface portion 32 and the side surface portion 33 face each other, and the upper side surface 32A and the upper side surface 33A are separated from each other as they descend from the upper end of the bead 30, and the most separated bent portion 32C and the bent portion 33C shift to the lower end. Accordingly, the lower side surface 32B and the lower side surface 33B are formed in a substantially diamond shape that gradually approaches.

  By forming this bead 30, the third folding line 20c and the fourth folding line 20d that bend along the upper edge and the lower edge of the front face 26 in the corner part 1C are divided, and the rigidity strength of the shock absorbing member 20 in the corner part 1C is divided. Is suppressed, and the rigidity strength of the center portion in the vertical direction of the front surface 26 where the bent portions 32C and 33C of the side surface portions 32 and 33 that are the maximum width of the bead 30 are formed is reduced.

  Next, the operation of the shock absorber 20 of the bumper 1 configured as described above will be described.

  In the case of a light collision in which the central range 1A of the bumper 1 is in contact with a pedestrian or the like at low speed, the impact load F1 is transmitted to the front surface 26 of the shock absorbing member 20 via the bumper face 50, and the shock absorbing member 20 And the upper inclined surface 24 and the lower inclined surface 25 which are inclined as the front surface 26 retreats are pushed apart so as to be separated from each other, and the upper horizontal surface 22 and the lower surface are lowered. An upper horizontal plane 22 and a lower horizontal plane 23 in which the front end of the horizontal plane 23 is pressed rearward and the rear end edges 22e and 23e are connected by the rear plane 21 are centered in the front-rear direction along the extending direction of the central range 1A. The portion is crushed and deformed so as to protrude as the first convex ridge lines 22a and 23a to absorb the impact load F1 and reduce the obstacle damage to the pedestrian.

  Further, when the inclined portion range 1B comes into contact with a pedestrian or the like at low speed traveling, the impact load F2 is transmitted to the front surface 26 of the impact absorbing member 20 via the bumper face 50, and the impact absorbing member 20 and the bumper beam 10 are The load is concentrated between the front surface 11 and the front ends of the upper horizontal surface 22 and the lower horizontal surface 23 are pressed backward through the upper inclined surface 24 and the lower inclined surface 25 as the front surface 26 is retracted, and the rear end. The upper horizontal surface 22 and the lower horizontal surface 23 in which the edges 22e and 23e are connected by the rear surface 21 protrude along the extending direction of the inclined portion range 1B as second convex bent ridgelines 22b and 23b. In this way, it is crushed and deformed to absorb the impact load F2 and reduce the obstacle damage to the pedestrian.

  On the other hand, when the corner portion 1C which moves from the central portion range 1A side of the bumper 1 to the inclined portion range 1B side in contact with a pedestrian or the like at low speed traveling, an impact absorbing member is passed through the bumper face 50 by the impact load F3. 20 beads 30 are formed and transmitted to the front surface 26, and the load is concentrated between the shock absorbing member 20 and the front surface 11 of the bumper beam 10, and from the normal state shown in FIG. As shown in FIG. 5B, the front surface 26 is deformed into a curved shape centering on the center in the vertical direction of the front surface 26 whose rigidity is suppressed by the bead 30 by the impact load F3. Along with the curved deformation of the front surface 26, a moment M1 is generated which is continuously formed on the front surface 26 and which pushes the upper inclined surface 24 and the lower inclined surface 25 toward each other at the front ends of the upper inclined surface 24 and the lower inclined surface 25. The upper inclined surface 24 and the lower inclined surface 25 are rotationally shifted so that they stand up with each other. As the upper inclined surface 24 and the lower inclined surface 25 change in rotation, the upper horizontal surface 22 and the lower horizontal surface 23 that are continuously formed on the upper inclined surface 24 and the lower inclined surface 25 are provided in front of these upper horizontal surfaces. 22 and the lower horizontal surface 23 are pushed in a direction to expand each other, and the upper horizontal surface 22 and the lower horizontal surface 23 are rotated in a direction away from each other, and the central portions of the upper horizontal surface 22 and the lower horizontal surface 23 are moved. As shown in FIGS. 4 (b) and 4 (c), it projects as a convex folded ridgeline and is smoothly crushed and deformed.

  Here, the formation of the bead 30 divides the third fold line 20c between the front surface 26 and the upper inclined surface 24 and the fourth fold line 20d between the front surface 26 and the lower inclined surface 25, and the front surface portion 31 is separated. Since it is formed in a flat shape and its rigidity is suppressed, it is easily crushed and deformed in the initial contact with a pedestrian, the drag due to the deformation of the shock absorber 20 is greatly reduced, and the front portion 31 of the bead 30 is further reduced. With this deformation, bending deformation of the upper horizontal surface 22 and the lower horizontal surface 23 is induced via the upper inclined surface 24 and the lower inclined surface 25, respectively, and the upper horizontal surface 22 and the lower horizontal surface 23 are smoothly crushed smoothly. An appropriate deformation mode to be deformed is obtained, and shock absorption by crushing deformation of the upper horizontal plane 22 and the lower horizontal plane 23 is performed. As a result, it is possible to obtain a reduction in obstacle damage to pedestrians and the like due to collapse deformation in an appropriate deformation mode continuously performed by the impact absorbing member 20 with the impact load F3. FIG. 5 shows the correlation between the deformation stroke S and the drag F of the shock absorbing member 20 in the corner portion 1A.

  Further, along with the optimization of the deformation mode with respect to the impact of the impact absorbing member 20, the impact absorbing member 20 can be made compact and the mass can be reduced, and the bumper 1 can be downsized and the manufacturing cost can be reduced.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above-described embodiment, the bead 30 is formed in a substantially rhombus shape. However, as shown in FIG. 6, the bead 30 includes a bead 30 extending in the horizontal direction at the center in the height direction of the front surface 26. The front portion 41 and the side portions 42 and 43 having a large width at the added central portion in the height direction can be formed into a shape extending in the vertical direction with a U-shaped cross section with the front side open.

  Specifically, the front surface portion 41 of the bead 40 has an upper end edge 41a extending along the folding line 20c to the upper inclined surface 24, while a lower end edge 41b extending to the lower inclined surface 25 along the folding line 20d. Upper side edges 41c and 41h that are gradually separated from each end of the upper end edge 41a and the upper horizontal edges 41c and 41h that are separated from the lower ends of the upper side edges 41c and 41h and extending in the horizontal direction. The side edges 41d, 41i, the upper horizontal edges 41d, 41i extend downward from the side edges of the side edges 41e, 41j, and the lower ends of the side edges 41e, 41j, and the side edges continue to the lower ends of the side edges 41e, 41j. , 41i and 41i, respectively, and extend downward from the inner ends of the lower horizontal edges 41f, 41k and the lower horizontal edges 41f, 41k. Bottom reaching the edge Side edge 41 g, the central portion having a 41m are formed into a substantially rhombic projecting horizontally.

  The side surface portion 42 includes an upper side surface 42A formed along the upper side edge 41c and the upper horizontal edge 41d of the front surface portion 41, a lower side surface 42B formed along the lower horizontal edge 41f and the lower side edge 41g, And the bent part 42C which is formed along the side edge 41e and connects the upper side surface 42A and the lower side surface 42B is continuously formed. The side surface portion 43 includes an upper side surface 43A formed along the upper side edge 41h and the upper horizontal edge 41j of the front surface portion 41, a lower side surface 43B formed along the lower side horizontal edge 41k and the lower side edge 41m, And the bending part 43C which is formed along the side edge 41j and connects the upper side surface 43A and the lower side surface 43B is continuously formed.

  By forming the bead 40 in this way, the rigidity strength is linearly reduced along the extending direction of the shock absorbing member 20 at the center in the vertical direction of the front surface 26, and the deformation is crushed in the initial contact with the pedestrian. The drag caused by the deformation of the shock absorbing member 20 can be further reduced, and the shock absorbing member 20 can reduce obstacle damage to a pedestrian or the like due to a collapse deformation in an appropriate deformation mode.

DESCRIPTION OF SYMBOLS 1 Bumper 1A Center part range 1B Inclined part range 1C Corner part 10 Bumper beam 20 Shock absorbing member 21 Rear surface 22 Upper horizontal surface 23 Lower horizontal surface 20a First folding curve 20b Second folding curve 20c Third folding curve 20d Fourth folding curve 22a, 23a First convex ridge line 22b, 23b Second convex ridge line 24 Upper inclined surface 25 Lower inclined surface 26 Front surface 30 Bead 31 Front surface portion 31a Upper edge 31b Lower edge 32 Side surface 32A Upper side surface 32B Lower side surface 32C Bent portion 33 Side surface portion 32 Side surface portion 33A Upper side surface 33B Lower side surface 33C Bent portion 40 Bead 41 Front surface portion 41a Upper end edge 41b Lower end edge 42 Side surface portion 42A Upper side surface 42B, Lower side surface 42C Bent portion 43 Side surface portion 43A Upper side surface 43B Lower side 43C bent part

Claims (4)

A bumper beam that is supported by the left and right side frames and extends in the vehicle width direction, and an upper horizontal plane and a lower horizontal plane that are made of a metal plate and extend along the front surface of the bumper beam;
An upper inclined surface that extends diagonally forward and downward along the front edge of the upper horizontal plane, and that extends diagonally forward and upward via a second folding line along the front edge of the lower horizontal plane. A lower inclined surface, and a front surface whose upper edge is continuous with the front edge of the upper inclined surface via a third folding line and whose lower edge is continuous with the front edge of the lower inclined surface via a fourth folding curve It has a closed cross-sectional shape and has an inclined part range that bends from both ends of the central part range extending along the vehicle width direction through the corner part and extends obliquely rearward to the outer side of the vehicle. The upper horizontal plane and the lower horizontal plane in the central area range are crushed and deformed with the central section as the first convex ridge line along the extending direction of the central area area by the impact load to absorb the impact load, and to the inclined area range. Due to the impact load, the upper horizontal surface and the lower horizontal surface in the inclined portion range become the inclined portion range. In the shock absorbing member of the bumper that absorbs shock by being crushed and deformed as the second convex folded ridge line along the extending direction of the enclosure,
The upper end edge extends along the third folding line to the upper inclined surface, and the lower end edge extends along the planar front surface portion extending along the fourth folding curve and each side edge of the front surface portion. An impact-absorbing member for a bumper, characterized in that a bead extending in the vertical direction is formed in a U-shaped cross-section with a front side having a pair of side portions open. The front portion gradually moves away from each end of the upper end edge and gradually approaches to the center height position of the front surface and approaches the lower end edge as it descends from the lower end of each upper side edge. Formed in a rhombus with a lower side edge reaching each end of the
Each side surface includes an upper side surface formed along the upper side edge of the front surface portion and a lower side surface formed along the lower side edge continuously through the bent portion at the lower end of the upper side surface. The bumper shock absorbing member according to claim 1, wherein the bumper shock absorbing member is provided. The front portion includes an upper side edge that gradually separates from each end of the upper end edge, an upper horizontal edge that extends away from the lower end of the upper side edge, and extends in the horizontal direction. A side edge that extends downward from the side edge and faces each other, a lower horizontal edge that extends in the horizontal direction so that the side edge continues to the lower edge of each side edge and faces the upper horizontal edge, and A central portion having a lower side edge extending downward from the inner end of the lower horizontal edge and approaching each other as it descends and reaching each end of the lower end edge is formed in a substantially rhombic shape protruding in the horizontal direction. ,
Each of the side surfaces includes an upper side surface formed along the upper side edge and the upper horizontal edge of the front surface portion, a lower side surface formed along the lower side horizontal edge and the lower side edge, and a side edge. The bumper impact absorbing member according to claim 1, further comprising a bent portion that is formed along the upper side surface and the lower side surface.   The impact absorbing member for a bumper according to any one of claims 1 to 3, wherein rear end edges of the upper horizontal plane and the lower horizontal plane are connected by a rear surface.

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