Bumper assembly with crash boxes
A bumper assembly, having a cross member, which is coupled to a motor vehicle via crash boxes, wherein the cross member is oriented with its longitudinal direction in the motor vehicle transverse direction and on a rear wall has attachment regions in which the crash boxes are coupled by a material connection to the cross member, wherein in cross section a chamfer or a radius is configured on the crash boxes in an external corner, relative to the motor vehicle transverse direction.
1 . A bumper assembly, comprising:
a cross member coupled to a motor vehicle via crash boxes, wherein
the cross member has a longitudinal direction,
the cross member is oriented with the longitudinal direction along a transverse direction of the motor vehicle,
the cross member has a rear wall which has attachment regions in which the crash boxes are coupled by a material connection to the cross member,
in a cross section of the crash boxes which is parallel to the cross member, a chamfer or a radius is configured on each of the crash boxes in an external corner relative to the transverse direction of the motor vehicle, and
in the cross section, the chamfer or the radius is configured only in a front longitudinal portion of the crash box.
2 . The bumper assembly according to claim 1 , wherein at least one of the cross member or the crash boxes is configured as an extruded component.
3 . The bumper assembly according to claim 1 , wherein the chamfer comprises a chamfer angle of between 25 and 65°.
4 . The bumper assembly according to claim 1 , wherein the radius is between 12 mm and 25 mm.
5 . The bumper assembly according to claim 1 , wherein a side length of the chamfer is between 12 mm and 25 mm in at least one of the transverse direction or in a vertical direction of the motor vehicle.
6 . The bumper assembly according to claim 1 ,
wherein the material connection comprises a weld seam coupling each of the crash boxes to the cross member,
wherein the weld seam is configured on the rear wall of the cross member over at least 80% of a periphery of the rear wall.
7 . The bumper assembly according to claim 6 , wherein the weld seam is configured on the rear wall of the cross member over the entirety of the periphery of the rear wall.
8 . The bumper assembly according to claim 6 , wherein the weld seam is configured on the rear wall of the cross member over the periphery of the rear wall at least in a region of the chamfer or the radius.
9 . The bumper assembly according to claim 1 , wherein each of the crash boxes has a bead on at least one of an internal wall or an external wall, and the bead is arranged in the front longitudinal portion of the crash box.
10 . The bumper assembly according to claim 1 , wherein at least one of a lower wall or an upper wall of each of the crash boxes engages below the cross member in a longitudinal direction of the motor vehicle.
11 . The bumper assembly according to claim 1 , wherein the chamfer comprises a chamfer angle of between 4° and 50°.
12 . The bumper assembly according to claim 1 , wherein the chamfer comprises a chamfer angle of 45°.
13 . The bumper assembly according to claim 1 , wherein the front longitudinal portion is less than 60 mm.
14 . The bumper assembly according to claim 1 , wherein the front longitudinal portion is less than 30 mm.
15 . The bumper assembly according to claim 1 , wherein the front longitudinal portion is less than 10 mm.