JP4251562B2 - Bumper beam for vehicles - Google Patents

Description

  The present invention relates to a vehicle bumper beam that can absorb shock at a specific portion of the bumper beam when a small impact is applied to a vehicle body.

As a vehicular bumper beam, a vehicular bumper beam provided with an impact absorbing member capable of absorbing the impact with the bumper beam itself when a small impact is applied to the vehicle body is practically used.
A practical vehicle bumper beam is practically sufficient if an attack buffer member is provided between the bumper face and the bumper beam.

As such a vehicular bumper beam, there is known one using a hollow product obtained by blow molding a resin material on an impact absorbing member (see, for example, Patent Document 1).
JP 2004-155313 A (page 9, FIG. 8)

  FIG. 16 is a diagram for explaining a conventional basic principle. A bumper beam 300 for a vehicle absorbs an impact by passing the bumper beam main body 301 to the vehicle body in the vehicle width direction and deforming the bumper beam main body 301 with a small impact. An impact absorbing member 302 is provided, and the impact absorbing member 302 and the bumper beam body 301 are covered with a bumper face 303. The impact absorbing member 302 is a hollow product obtained by blow molding a resin material such as polypropylene or polyethylene. The two reinforcing ribs 305 and 306 are raised from the contact portion (base portion) 304 that contacts the bumper beam main body 301 toward the bumper face 303.

  However, in the vehicle bumper beam 300, when the obstacle 309 hits the bumper face 303 from the outside, the two reinforcing ribs 305 and 306 act so as to stretch between the obstacle 309 and the bumper beam main body 301. Therefore, there is a problem that the shock absorbing member 302 may not be smoothly deformed.

  Further, in the vehicle bumper beam 300, smooth deformation of the shock absorbing member 302 may be hindered. Therefore, depending on the path of the obstacle 309, a rotational moment may act on the vehicle bumper beam 300. A force in the direction of peeling from the vehicle body may be applied to the vehicle body.

  That is, a vehicle bumper beam that can smoothly deform the shock absorbing member is desired.

  An object of the present invention is to provide a vehicle bumper beam that solves the problem that the smooth deformation of the shock absorbing member is hindered and that allows the smooth deformation of the shock absorbing member.

  According to the first aspect of the present invention, a bumper beam formed of an aluminum extruded material is passed in the vehicle width direction through an extension that absorbs shock to the vehicle body, and the bumper beam is deformed when a small shock is applied to absorb the shock. In the bumper beam for vehicles in which the impact absorbing member is provided outside the bumper beam, the impact absorbing member is formed of an aluminum extruded material, and is a member having the extrusion direction along the vehicle width direction, and is in contact with the outside. When the part is called a contact part, the shock absorbing member has an arcuate part that connects both ends of the contact part in a cross-sectional shape (in a sectional view) in a substantially semicircular shape, and the arc part is bifurcated from the center of the contact part. And first and second connecting ribs extending on a convex curve.

  For example, if it is possible to allow smooth deformation of the shock absorbing member, it is preferable because deformation reaching the bumper boom and the extension can be prevented in advance.

  Therefore, the shock absorbing member is formed of a hollow product or an extruded material, and the shock absorbing member has a circular arc portion connecting both ends of the abutting portion in a substantially semicircular shape, and the arc portion protrudes from the center of the abutting portion in a bifurcated manner. And first and second connecting ribs extending on a curved line.

  That is, by extending the first and second connecting ribs from the center of the abutting portion to a circular arc portion on a convex curve, the first and second connecting ribs are applied when a load is applied to the circular arc portion. Is not stretched between the arc portion and the contact portion, and the projecting bifurcated portion is smoothly deformed to absorb the impact. Thereby, the impact absorbing member can input an impact perpendicular to the bumper beam.

In the invention according to claim 1, since the first and second connecting ribs are extended from the center of the abutting portion to the arc portion on the convex curve in a bifurcated shape, when the load is applied to the arc portion, the first The second connecting rib does not stretch between the arc portion and the contact portion, and the impact can be absorbed while the convex bifurcated portion is smoothly deformed. Thereby, the impact absorbing member can input an impact perpendicular to the bumper beam. As a result, there is an advantage that a rotational moment can be generated in the bumper beam and a force in the peeling direction can be prevented from being applied to the bumper beam.
Further, since the aluminum extruded material is used for the bumper beam and the buffer absorbing member, it can be easily manufactured (made), and since the bumper beam and the buffer absorbing member are made of the same material, attachment by welding or the like can be facilitated. .

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a vehicle adopting a vehicle bumper beam and a vehicle bumper beam mounting structure according to the present invention, in which 10 is a vehicle, 12 is a front wheel, 13 is a rear wheel, 14 is a hood, 15 is a roof, 16 is a front window, 17 is a rear window, 18 is a front door, 19 is a rear door, 23 is a trunk lid, 24 is a front pillar, 26 is a door mirror, 27 is a tail lamp, 28 is a front fender, 29 is a rear fender, and 36 is a bumper. It is a face (rear bumper face).

  The vehicle bumper beam mounting structure 30 is a bumper beam mounting structure in which a vehicle bumper beam 40 formed of an aluminum extruded material is passed in the vehicle width direction via extensions 33 and 33 that absorb shocks to the vehicle body. This is a rear bumper beam mounting structure in which an impact applied to the vehicle body side from the vehicle bumper beam 40 is sufficiently absorbed by the extension 33 by being smoothly deformed.

  The vehicular bumper beam 40 according to the present invention is provided with an impact absorbing member 41 that absorbs an impact by deformation when a small impact is applied to the bumper beam. The impact absorbing member 41 is smoothly provided. It is a rear bumper beam that takes shape into account so that it can be deformed. Hereinafter, the vehicle bumper beam mounting structure 30 and the vehicle bumper beam 40 will be described in detail.

  FIG. 2 is a perspective view of the vehicle bumper beam mounting structure according to the present invention. The vehicle bumper beam mounting structure 30 includes left and right rear side frames 31 and 31 as vehicle bodies and left and right extensions ( A bumper beam 40 for vehicles (hereinafter abbreviated as “bumper beam 40”) attached via impact buffer members 33, 33 and a bumper face 36 covering the bumper beam 40.

In addition, 39 ... (... indicates a plurality. The same applies hereinafter) indicates bolts for attaching the bumper beam 40 (specifically, left and right extensions 33, 33) to the rear side frames 31, 31.
Further, the rear side frame 31 includes nuts 37 and 37 for attaching the bumper beam 40 to the rear end surface 32, and escape holes 38 and 38 that face the nuts 37 and 37.

The bumper beam 40 is a member formed of an aluminum extruded material, and includes a straight portion 42 formed at the center in the vehicle width direction, and left and right extension mounting portions 43 and 43 formed by bending both ends of the straight portion 42. The straight portion 42 is provided with an impact absorbing member 41 that absorbs shock by deforming when a small impact is applied to the bumper beam, and the extension mounting portion 43 is inserted with bolts 39 and 39 for mounting on the rear side frame 31. The insertion holes 45 are provided (45 and 45 on the side of the extensions 33 and 33 are not shown).
The bumper face 36 is a member that is formed of a resin such as polypropylene and is formed so as to follow the outer shape of the bumper beam 40.

FIG. 3 is a plan view of the left extension of the vehicle bumper beam mounting structure according to the present invention. In this figure, the left extension is described as “left extension 33L”.
The left extension 33L is formed of an aluminum extruded material in a plan view and welded to the bumper beam 40 with the extrusion direction perpendicular to the vehicle width direction and is in contact with the left rear side frame 31 and the bottom (bottom). 51, an inner wall 52 that extends from the bottom surface 51 to the bumper beam 40 in a curve inwardly toward the vehicle width of the bumper beam 40, and a beam inner receiver that receives the bumper beam 40 by extending outward from the tip of the inner wall 52 to the vehicle width. A curved portion extending from the middle of the slope wall 54 to the outer side of the bumper beam 40 from the middle of the slope portion 54, the slope wall 54 extending obliquely from the front end of the beam inner receiving portion 53 toward the bottom surface 51 The intermediate wall 55 extending to the bumper beam 40 and the outside of the beam that receives the bumper beam 40 by extending from the tip of the intermediate wall 55 outward in the vehicle width direction. An outer wall portion 57 extending from the tip of the beam outer receiving portion 56 to the bottom surface 51, and an extension extending inward of the vehicle width along the bottom surface 51 from the connecting portion 58 of the inner wall portion 52 and the bottom surface 51. And an exit part 59.

The left extension 33L has an insertion hole 61 into which the bolt 39 is inserted into the slope wall 54, an insertion hole 62 into which the bolt 39 is inserted into the beam outer receiving portion 56, and the bolt 39, Through holes 63 and 64 through which the male screw portions 39a and 39a of 39 are penetrated are formed.
The left extension 33L is obtained by welding the beam date receiving portion 53 and the beam outer receiving portion 56 to the extension mounting portion 43 of the bumper beam 40.

  Here, when the thickness of the bottom surface (bottom portion) 51, the beam inner receiving portion 53 and the beam outer receiving portion 56 is t1, and the wall thickness of the inner wall portion 52, the slope wall 54 and the intermediate wall 55 is t2, the left extension 33L is set to t2 <t1, and preferably the wall thickness t2 is about 2/3 of the wall thickness t1.

  That is, when the thickness of the bottom surface 51, the beam inner receiving portion 53 and the beam outer receiving portion 56 is t1, and the wall thickness of the inner wall portion 52, the slope wall 54 and the intermediate wall 55 is t2, the left extension 33L is t2. By setting it to <t1, it can deform | transform further and can absorb an impact.

FIG. 4 is a plan view of the right extension of the bumper beam mounting structure for a vehicle according to the present invention. In this drawing, the right extension is referred to as “right extension 33R”.
The right extension 33R is a member symmetrical to the left extension 33L (see FIG. 3) with respect to the center of the vehicle body, and only the reference numerals are shown and detailed description thereof is omitted. That is, 51 is a bottom surface (bottom), 52 is an inner wall portion, 53 is a beam inner receiving portion, 54 is a slope wall, 55 is an intermediate wall, 56 is a beam outer receiving portion, 57 is an outer wall portion, 58 is a connecting portion, and 59 is a connecting portion. The extension parts 61 and 62 indicate insertion holes.

  FIG. 5 is a side view of an impact absorbing member for a bumper beam for a vehicle according to the present invention. The impact absorbing member 41 is formed of an aluminum extruded material, and the outer side (rear end) 46 of the bumper beam 40 along the vehicle width direction. And a contact portion (base portion) 72 that contacts the outer side 46 of the bumper beam 40 in a side view (sectional view), and an arc portion 73 that connects both ends of the contact portion 72 in a substantially semicircular shape. And the first and second connecting ribs 75 and 76 extending in a forked shape from the center of the contact portion 72 on the circular arc portion 73.

  FIG. 6 is a plan view of a vehicle bumper beam mounting structure according to the present invention. The vehicle bumper beam mounting structure 30 is made of aluminum extruded through extensions 33 and 33 that absorb shocks to left and right rear side frames (vehicle bodies) 31 and 31. In the bumper beam mounting structure in which the bumper beam 40 formed of a material is passed in the vehicle width direction, the extension 33 is formed of an aluminum extruded material, and is attached to the bumper beam 40 with the extrusion direction being orthogonal to the vehicle width direction. When the surface to be brought into contact with the rear end surface 32 of the frame 31 is referred to as a bottom surface (bottom portion) 51, an inner wall portion 52 that extends from the bottom surface 51 to the bumper beam 40 on the curve inward of the bumper beam 40 and the inner wall portion 52. That receives the bumper beam 40 by extending outward from the front end of the vehicle. The inner wall receiving portion 53, the slope wall 54 extending obliquely from the tip of the beam inner receiving portion 53 toward the outer side of the vehicle width to the bottom surface 51, and the outer side of the bumper beam 40 from the middle of the inclined wall 54. An intermediate wall 55 extending to the bumper beam 40 on the curve, a beam outer receiving portion 56 that receives the bumper beam 40 by extending from the front end of the intermediate wall 55 toward the vehicle width direction, and a bottom surface 51 from the front end of the beam outer receiving portion 56. It can be said that the outer wall portion 57 extends to the end.

  That is, the bottom surface (bottom portion) 51 is a surface to be brought into contact with the rear end surface 32 of the rear side frame 31, the inner wall portion 52 extends from the bottom surface 51 to the bumper beam 40 in a curve inward of the bumper beam 40, and the inner wall portion 52. A beam inner receiving portion 53 that receives the bumper beam 40 by extending outward from the front end of the vehicle, and a sloped wall 54 that extends obliquely from the front end of the beam inner receiving portion 53 toward the bottom surface 51 toward the outer side of the vehicle width, An intermediate wall 55 that extends from the middle of the slope wall 54 to the bumper beam 40 in a curved line outwardly of the bumper beam 40 and a beam receiver that receives the bumper beam 40 by extending from the tip of the intermediate wall 55 outward of the vehicle width. By forming the portion 56 and the outer wall portion 57 extending from the tip of the beam outer receiving portion 56 to the bottom surface 51, a small impact is applied to the bumper beam 40. When Tsu, so as to smoothly deform the extension 33, it is possible to prevent body deformation and reduction of component replacement cost. As a result, the impact applied from the bumper beam 40 to the rear side frames (vehicle bodies) 31, 31 can be sufficiently absorbed by the extensions 33, 33.

  The vehicular bumper beam mounting structure 30 forms an extending portion 59 inward of the vehicle width along the bottom surface 51 from the connecting portion 58 of the inner wall portion 52 and the bottom surface (bottom portion) 51, and this extending portion 59 is formed on the rear side frame ( It can be said that the vehicle is supported by the vehicle body 31.

  The vehicular bumper beam mounting structure 30 forms an extending portion 59 inward of the vehicle width along the bottom surface 51 from the connecting portion 58 of the inner wall portion 52 and the bottom surface 51, and this extending portion 59 is formed on the rear side frame (vehicle body) 31. When the shock is absorbed by the inner wall portion 52, it can be dispersed by the extension portion 59 and the bottom surface (bottom portion) 51 and transmitted to the rear side frame 31. As a result, it is possible to avoid a local impact on the rear side frame 31.

  7 is a cross-sectional view taken along the line 7-7 in FIG. 6, and is made of an aluminum extruded material through extensions 33, 33 that absorb shocks to the left and right rear side frames (vehicle bodies) 31, 31 (see FIG. 2) shown in FIG. In the vehicle bumper beam in which the formed bumper beam 40 is provided in the outer side of the bumper beam 40 by passing the formed bumper beam 40 in the vehicle width direction and deforming when a small impact is applied to the bumper beam 40. 41 is a member formed of an aluminum extruded material, and is a member along the extrusion direction in the vehicle width direction. An arcuate part 73 that connects both ends of the abutting part 72 in an extruded cross-sectional shape (in cross-sectional view) in a substantially semicircular shape, and a curved shape that is bifurcated and convex from the center of the abutting part 72 to the arcuate part 73. It indicates that with the first and second connecting ribs 75 and 76 extend above the.

  That is, the first and second connecting ribs 75 and 76 are bifurcated from the center of the contact portion 72 and extend to the arc portion 73 on the convex curve, so that when the load is applied to the arc portion 73, the first The second connecting ribs 75 and 76 are not stretched between the arc portion 73 and the contact portion 72, and the impact can be absorbed while the convex bifurcated portion is smoothly deformed. Thereby, the impact absorbing member 41 can input an impact perpendicularly to the bumper beam 40. As a result, it is possible to prevent the bumper beam 40 from generating a rotational moment and applying a force in the peeling direction to the bumper beam 40.

  Moreover, since the aluminum extruded material is used for the bumper beam 40 and the buffer absorbing member 41, it can be easily manufactured (created), and since the bumper beam 40 and the buffer absorbing member 41 are the same material, they can be easily attached by welding or the like. can do.

  8 is a cross-sectional view taken along the line 8-8 in FIG. 6. The extension mounting portion 43 is formed with insertion holes 45 for inserting bolts 39, 39 for mounting on the rear side frame 31, and the slope wall 54 of the extension 33 is formed. It is shown that the insertion hole 61 into which the bolt 39 is inserted is formed and the insertion hole 62 into which the bolt 39 is inserted is formed in the beam outer receiving portion 56, so that the bumper beam 40 can be attached to the rear side frame 31 from the rear.

  That is, the vehicle bumper beam mounting structure 30 mounts the bumper beam 40 to the rear side frame 31 from the rear by forming the insertion holes 45... In the rear side frame 31 and forming the insertion holes 61 and 62 in the extension 33. be able to. As a result, the mountability of the bumper beam 40 can be improved. In the figure, reference numeral 65 denotes a reinforcing rib formed inside the bumper beam 40.

FIGS. 9A to 9C are operation explanatory views showing stepwise the state of shock absorption of the vehicle bumper beam and the vehicle bumper beam mounting structure according to the present invention.
In (a), the bumper beam 40 and the vehicle bumper beam mounting structure 30 in the initial state are shown, and the obstacle 79 is located behind the bumper beam 40.

  In (b), when the obstacle 79 collides with the impact absorbing member 41 of the bumper beam 40 as indicated by the arrow a1, the impact absorbing member 41 can absorb the impact if the collision state is slight. And the extensions 33 and 33 are not deformed. Therefore, in such a case, it is only necessary to repair the bumper face 36 (see FIG. 2) and the shock absorbing member 41, and the maintenance cost of the vehicle 10 (see FIG. 1) can be reduced.

  In (c), when the obstacle 79 collides with the shock absorbing member 41 of the bumper beam 40 as shown by the arrow a2, if the collision state is medium, the shock absorbing member 41, the bumper beam 40, and the extensions 33, 33 are moved. It can be deformed to absorb impact. As a result, damage to the left and right rear side frames (vehicle bodies) 31, 31 can be prevented in advance.

FIGS. 10A to 10D are explanatory views showing the operation of the vehicle bumper beam according to the present invention. FIGS. 10A and 10B show the vehicle bumper beam 240 of the comparative example, and FIGS. ) Shows the bumper beam 40 of the embodiment.
In (a), a vehicular bumper beam 240 (hereinafter abbreviated as “bumper beam 240”) is provided with an impact absorbing member 241 on the outer side 246, and abutting the impact absorbing member 241 on the outer side 246. And a linear rib 245 that connects the center of the contact part 242 to the center of the arc part 243. The arc part 243 connects both ends of the contact part 242 in a substantially semicircular shape. Reference numeral 247 denotes a bumper face.

  In (b), when the obstacle 249 hits the impact absorbing member 241 as shown by the arrow b1, the linear rib 245 of the impact absorbing member 241 acts so as to be stretched, which may prevent smooth deformation of the impact absorbing member 241. . As a result, a rotational moment acts on the bumper beam 240 as indicated by an arrow b2, and a force in the direction of separating the bumper beam 240 from the rear side frame 231 acts. As a result, even a slight impact may cause damage to the bumper beam 240.

  In (c), an abutting portion 72 that abuts against the outer side 46 of the bumper beam 40, an arc portion 73 that connects both ends of the abutting portion 72 in a substantially semicircular shape, and the arc portion 73 from the center of the abutting portion 72. This shows that the first and second connecting ribs 75 and 76 extend in a bifurcated manner and on a curved line.

  In (d), the first and second connecting ribs 75 and 76 are bifurcated from the center of the abutting portion 72 and curvedly to the arc portion 73 so that the obstacle 79 is formed on the arc portion 73 as indicated by an arrow b3. The first and second connecting ribs 75 and 76 are not stretched between the arc portion 73 and the contact portion 72 during a light collision, and can absorb the impact while being smoothly deformed. Thereby, the impact absorbing member 41 can input an impact perpendicularly to the bumper beam 40, and the deformation of the bumper beam 40 can be prevented.

  FIGS. 11A and 11B are explanatory views showing an external force input state of the vehicle bumper beam mounting structure according to the present invention, FIG. 11A shows a vehicle bumper beam mounting structure 230 of a comparative example, and FIG. The bumper beam attachment structure 30 for vehicles of an Example is shown.

  In (a), a bumper beam mounting structure 230 for a vehicle is such that a bumper beam 232 is passed in the vehicle width direction via an extension 233 that absorbs shock to the rear side frame 231, and from a bottom surface (bottom portion) 251 that is mounted on the rear side frame 231. The inner wall portion 252, the intermediate wall 255 and the outer wall portion 257 are linearly raised, and the tips of the inner wall portion 252, the intermediate wall 255 and the outer wall portion 257 are connected by a beam receiving portion 253 which is welded to the bumper beam 232. When an external force is applied as indicated by an arrow c1,..., An external force is applied that deforms the extension 233 as indicated by an arrow c2 around the connecting portion 258 of the bottom surface 251 and the inner wall portion 252.

  In (b), when an external force is similarly applied as indicated by an arrow c3... In the vehicle bumper beam mounting structure 30, the extension 33 is provided as indicated by an arrow c4 around the bottom (bottom) 51 and the connecting portion 58 of the inner wall 52. Deformation external force acts.

  12A to 12D are explanatory views showing the external force absorbing action of the vehicle bumper beam mounting structure according to the present invention, and FIGS. 12A and 12B show a vehicle bumper beam mounting structure 230 of a comparative example. (C), (d) shows the vehicle bumper beam mounting structure 30 of the embodiment.

  In (a), in the vehicle bumper beam mounting structure 230, when an external force (rotational moment) is applied to the extension 233 as shown by the arrow d1, the inner wall portion 252 and the intermediate wall 255 are easily deformed as shown in (b). However, the bottom surface 251 is deformed as indicated by arrows d2 and d3, and there is a possibility that the rear side frame 231 may be damaged even by a moderate impact.

  In (c), in the vehicle bumper beam mounting structure 30, when an external force (rotational moment) is applied to the extension 33 as indicated by an arrow d4, as shown in (d), the inner wall portion 52 is deformed as indicated by an arrow d5 and the arrow d6. Thus, the intermediate wall 55 can be deformed and the external force can be absorbed smoothly. As a result, the impact applied from the bumper beam 40 to the rear side member (vehicle body) 31 can be sufficiently absorbed by the extension 33.

  FIG. 13 is a side view of a first alternative embodiment of the shock absorbing member of the bumper beam for a vehicle according to the present invention. The shock absorbing member 81 includes a contact portion (base portion) 82 that contacts the outer side 46 of the bumper beam 40, and An arc 83 connecting both ends of the abutting portion 82 in a substantially semicircular shape, and first and second connecting ribs 85, 86 extending on the arc portion 83 from the center of the abutting portion 82 in a bifurcated manner and on a curved line. When the thickness of the contact portion 82 and the arc portion 83 is t3, and the thickness of the first and second connecting ribs 85 and 86 is t4, the thickness t3 is greater than the thickness t4. Preferably, the wall thickness t4 is about 2/3 of the wall thickness t3.

  By setting t4 <t3, the shock absorbing member 81 can input the shock to the bumper beam 40 (see FIG. 2) more smoothly and vertically. That is, the deformation of the bumper beam 40 can be prevented.

FIG. 14 is a side view of a second embodiment of the impact absorbing member for a vehicle bumper beam according to the present invention. The impact absorbing member 91 is an abutting portion (see FIG. 2) that abuts against the outer side 46 of the bumper beam 40 (see FIG. 2). 92), a circular arc portion 93 that connects both ends of the circular arc portion 93 in a semicircular shape, a vertical portion 97 that extends from the central root portion of the abutting portion 92, and a bifurcated and curved line extending from the vertical portion 97. The first and second connecting ribs 95 and 96 are also provided.
The vertical portion 97 includes curved portions 98 and 98 at the base, and the contact portion 92 includes flange portions 99 and 99 at both ends.

  The shock absorbing member 91 can easily deform the arc portion 93 itself by forming the arc portion 93 in a semicircular shape.

  Further, the shock absorbing member 91 extends from the central portion of the contact portion 92 to the vertical portion 97, and the vertical portion 97 includes curved portions 98 and 98 at the root, so that the impact on the contact portion 92 due to shock absorption is minimized. Can be suppressed. That is, it can be said that the shock absorbing member 91 includes a vertical portion between the center of the contact portion 92 and the first and second connection ribs 95 and 96. By providing a vertical portion between the connection ribs 95 and 96, it is possible to suppress the influence on the contact portion 92 due to the deformation of the first and second connection ribs 95 and 96. As a result, local deformation of the bumper beam 40 can be suppressed.

  Furthermore, the welding distortion with respect to the impact-absorbing member 91 can be improved by providing the flange portions 99 and 99 at both ends of the contact portion 92.

  FIG. 15 is a side view of a third alternative embodiment of the shock absorbing member for a bumper beam for a vehicle according to the present invention. The shock absorbing member 101 is formed of a hollow resin (for example, polypropylene or polyethylene), and Adhering to the outer side (rear end) 46 of the bumper beam 40 along the vehicle width direction with a double-sided tape and / or an adhesive, and contacting the outer side 46 of the bumper beam 40 in a side view (sectional view) Part (base part) 102, arc part 103 connecting both ends of this abutting part 102 in a semicircular shape, and first and second arcs 103 extending from the center of abutting part 102 into a bifurcated shape and on a curved line. 2 connecting ribs 105 and 106. Reference numeral 109 denotes an adhesive layer.

  Since the shock absorbing member 101 is formed of a resin hollow product and adhered to the outer side 46 of the bumper beam 40, the efficiency of the replacement work of the shock absorbing member 101 can be improved.

  The vehicle bumper beam mounting structure according to the present invention is a rear bumper beam mounting structure mounted on the rear portion of the vehicle 10 as shown in FIG. 2, but the present invention is not limited to this, and the vehicle bumper beam mounting structure is not limited to this. Alternatively, it may be employed for a front bumper beam attached to the front portion of the vehicle.

  In the vehicle bumper beam mounting structure according to the present invention, as shown in FIGS. 3 and 4, the extension 33 is formed of an extruded aluminum material. However, the present invention is not limited to this, and may be an aluminum alloy or a magnesium alloy. .

  As shown in FIG. 2, the vehicle bumper beam according to the present invention is a rear bumper beam attached to the rear portion of the vehicle 10. However, the present invention is not limited to this, and the vehicle bumper beam is a bumper beam attached to the front portion of the vehicle. There may be.

  In the vehicle bumper beam according to the present invention, as shown in FIG. 4, the bumper beam 40 is formed of an aluminum extruded material. However, the present invention is not limited to this, and may be an aluminum alloy, a magnesium alloy, or a steel material.

  In the vehicular bumper beam according to the present invention, as shown in FIG. 4, the shock absorbing member 41 is formed of an aluminum extruded material. However, the invention is not limited to this, but as shown in FIG. There may be a hollow product of resin (polypropylene, polyethylene, etc.).

  As shown in FIG. 5, the vehicle bumper beam according to the present invention connects the arc portion 72 of the shock absorbing member 41 in a substantially semicircular shape, but is not limited thereto, and the arc portion has a polygonal shape, an arch shape, It may be formed in a tunnel shape or a dome shape.

  The vehicle bumper beam according to the present invention is suitable for use in passenger cars such as sedans and wagon cars.

1 is a perspective view of a vehicle adopting a vehicle bumper beam and a vehicle bumper beam mounting structure according to the present invention. It is a perspective view of the bumper beam attachment structure for vehicles concerning the present invention. It is a top view of the left extension of the bumper beam attachment structure for vehicles concerning the present invention. It is a top view of the right extension of the bumper beam attachment structure for vehicles concerning the present invention. It is a side view of the shock absorption member of the bumper beam for vehicles concerning the present invention. It is a top view of the bumper beam attachment structure for vehicles concerning the present invention. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 6. It is an operation explanatory view which shows the shock absorption situation of the bumper beam for vehicles and the bumper beam attachment structure for vehicles concerning the present invention in steps. It is explanatory drawing which shows the effect | action of the bumper beam for vehicles which concerns on this invention. It is explanatory drawing which shows the external force input state of the bumper beam attachment structure for vehicles which concerns on this invention. It is explanatory drawing which shows the external force absorption effect | action of the bumper beam attachment structure for vehicles which concerns on this invention. It is a side view of the 1st another example of the shock absorption member of the bumper beam for vehicles concerning the present invention. It is a side view of the 2nd another example of the impact-absorbing member of the bumper beam for vehicles concerning the present invention. It is a side view of the 3rd another example of the impact-absorbing member of the bumper beam for vehicles concerning the present invention. It is a figure explaining the conventional basic principle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 30 ... Bumper beam mounting structure for vehicles, 31 ... Rear side frame (vehicle body), 33 ... Extension, 40 ... Bumper beam for vehicles, 41 ... Shock absorption member, 46 ... Outer side, 51 ... Bottom surface, 52 ... Inner wall part, 53 ... Inner beam receiver , 54 ... slope wall, 55 ... intermediate wall, 56 ... beam outer receiving part, 57 ... outer wall part, 59 ... extension part, 72 ... abutting part, 73 ... arc part, 75, 76 ... first and second Connecting ribs.

Claims (1)

A bumper beam made of aluminum extruded material is passed in the vehicle width direction through an extension that absorbs shock to the vehicle body, and a shock absorbing member that absorbs shock by deforming when a small impact is applied to this bumper beam is placed outside the bumper beam. In the vehicle bumper beam provided,
The impact absorbing member is a member formed of an aluminum extruded material and having the extrusion direction along the vehicle width direction. An arc portion connecting both ends of the contact portion in a substantially semicircular shape, and first and second connection ribs extending on the arc portion from the center of the contact portion in a bifurcated and convex curve. A bumper beam for vehicles.

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