Energy absorption device

Patent metadata

Field	Value
Publication number	US-11945385-B2
Application number	US-202017593955-A
Country	US
Kind code	B2
Filing date	Mar 2, 2020
Priority date	Apr 3, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

An energy absorption device for a bumper of a motor vehicle has a first deformation element on the front side of the bumper. The first deformation element is a foam shaped part which extends over the width of the bumper and has a density of from 20 to 50 g/l. At least one second deformation element, with a density which is at least 50 g/l higher than the first deformation element, is inserted into the first deformation element.

First claim

What is claimed is:

1. An energy absorption device for a bumper of a vehicle, comprising:
a first deformation element, which extends substantially over an entire width of the bumper; and
at least one second deformation element, which is arranged on the first deformation element, in an exterior recess of the first deformation element, wherein
the first and the second deformation element are made of foam material with different densities,
the foam material of the first deformation element has a density which is at least 50 g/l lower than that of the foam material of the second deformation element,
the density of the foam material of the first deformation element is 20 to 50 g/l and the density of the foam material of the second deformation element is 80 to 250 g/l, and
the second deformation element is arranged adjacent to the first deformation element in a longitudinal direction of the vehicle whereby, in an event of a collision, the first deformation element is compressed before the second deformation element is compressed.

2. The energy absorption device according to claim 1 , wherein
the foam material of the first deformation element has a density which is at least 60 g/l lower than that of the foam material of the second deformation element.

3. The energy absorption device according to claim 1 , wherein
the foam material of the first deformation element has a density which is at least 70 g/l lower than that of the foam material of the second deformation element.

4. The energy absorption device according to claim 1 , wherein
the density of the foam material of the second deformation element is 90 to 250 g/l.

5. The energy absorption device according to claim 1 , wherein
the density of the foam material of the second deformation element ( 10 ) is 100 to 250 g/l.

6. The energy absorption device according to claim 1 , wherein
the second deformation element is inserted in the first deformation element.

7. The energy absorption device according to claim 6 , wherein
the first deformation element has a cutout for accommodating the second deformation element.

8. The energy absorption device according to claim 1 , wherein
the second deformation element is arranged on a front side of the first deformation element.

9. The energy absorption device according to claim 1 , wherein
the second deformation element has a cuboid-shape.

10. The energy absorption device according to claim 1 , wherein
the second deformation element has a strip-shaped design.

11. The energy absorption device according to claim 10 , wherein
the second deformation element extends over a substantial part of the width extent of the first deformation element.

12. The energy absorption device according to claim 1 , wherein
the second deformation element is connected to the first deformation element by a form fit and/or adhesive bonding.

13. The energy absorption device according to claim 1 , wherein
the first deformation element and the second deformation element are produced in the form of a multiple-element foam component.

14. A motor vehicle comprising an energy absorption device according to claim 1 .

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Gross Martin
• Koehler Arne
• Manske Tamara
• Muselmann Christian
• Novine Mazdak
• Rudolph Tim
• Schroeder Manuel

Classifications

• B60R19/18 Primary

  {characterised by the cross-section;} Means within the bumper to absorb impact · CPC title

• B60R2019/186

  Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material · CPC title

• B60R2019/1866

  Cellular structures · CPC title

• B60R2019/1873

  Cellular materials · CPC title