Longitudinal Member Arrangement of a Body of a Motor Vehicle and Body of a Motor Vehicle with a Longitudinal Member Arrangement of This Type

Patent metadata

Field	Value
Publication number	US-2017106920-A1
Application number	US-201615395624-A
Country	US
Kind code	A1
Filing date	Dec 30, 2016
Priority date	Jul 3, 2014
Publication date	Apr 20, 2017
Grant date	—

Abstract

A longitudinal member arrangement of a body of a motor vehicle is designed such that, in the event of a collision of the motor vehicle, the longitudinal member arrangement progressively fails, absorbing collision energy, with a first longitudinal member element which is formed from a fiber composite, and with a second longitudinal member element which is formed from a fiber composite and is arranged behind the first longitudinal member element. The first longitudinal member element and the second longitudinal member element are connected to each other by a connecting element. The longitudinal member arrangement is designed such that, in the event of the collision of the motor vehicle, the second longitudinal member element begins to fail after the first longitudinal member element has failed.

First claim

What is claimed is:

1 . A longitudinal member arrangement of a body of a motor vehicle, comprising:
a first longitudinal member element configured from a fiber composite material; a second longitudinal member element configured from a fiber composite material; and a connecting element configured to connect the first longitudinal member element and the second longitudinal element, wherein the second longitudinal member element is arranged behind the first longitudinal member element and is connected to the first longitudinal member element via the connecting element, and the longitudinal member arrangement is configured such that, in an event of a collision of the motor vehicle, the second longitudinal member element begins to fail after the first longitudinal member element has failed, whereby a progressive failure occurs that absorbs collision energy.

2 . The longitudinal member arrangement according to claim 1 , wherein
e first longitudinal member element has a triggering structure configured to reduce an initial failure force level of the first longitudinal member element, whereby the initial failure force level of the first longitudinal member element is lower than the initial failure force level of the second longitudinal member element.

3 . The longitudinal member arrangement according to claim 1 , wherein
at least one connecting region of the first longitudinal member element and one connecting region of the second longitudinal member element have an identical cross-sectional shape, an identical wall thickness and/or an identical material composition.

4 . The longitudinal member arrangement according to claim 2 , wherein
at least one connecting region of the first longitudinal member element and one connecting region of the second longitudinal member element have an identical cross-sectional shape, an identical wall thickness and/or an identical material composition.

5 . The longitudinal member arrangement according to claim 3 , wherein
a predetermined failure section of the first longitudinal member element and a predetermined failure section of the second longitudinal member element have an identical cross-sectional shape, an identical wall thickness and/or an identical material composition.

6 . The longitudinal member arrangement according to claim 1 , wherein
the connecting element is configured so as to support a front end side of the second longitudinal member element and to support a rear end side of the first longitudinal member element.

7 . The longitudinal member arrangement according to claim 6 , wherein
the connecting element has a wall, on a front side of which the rear end side of the first longitudinal member element is supported and/or on a rear side of which the front end side of the second longitudinal member element is supported.

8 . The longitudinal member arrangement according to claim 1 , wherein
the connecting element has a first sleeve section which engages around a rear end of the first longitudinal member element, and/or has a first projection section which is enclosed by the rear end of the first longitudinal member element.

9 . The longitudinal member arrangement according to claim 7 , wherein
the connecting element has a first sleeve section which engages around a rear end of the first longitudinal member element, and/or has a first projection section which is enclosed by the rear end of the first longitudinal member element.

10 . The longitudinal member arrangement according to claim 8 , wherein
the connecting element has a second sleeve section which engages around a rear end of the second longitudinal carrier element, and/or has a second projection section which is enclosed by the front end of the second longitudinal member element.

11 . The longitudinal member arrangement according to claim 9 , wherein
the connecting element has a second sleeve section which engages around a rear end of the second longitudinal carrier element, and/or has a second projection section which is enclosed by the front end of the second longitudinal member element.

12 . The longitudinal member arrangement according to claim 1 , wherein
the first longitudinal member element has a closed cross section and/or the second longitudinal member element has a closed cross section.

13 . The longitudinal member arrangement according to claim 11 , wherein
the first longitudinal member element has a closed cross section and/or the second longitudinal member element has a closed cross section.

14 . A body of a motor vehicle, comprising:
a front part or a rear part of the motor vehicle, the front part or the rear part of the motor vehicle comprising a longitudinal member arrangement, wherein the longitudinal member arrangement comprises:
a first longitudinal member element configured from a fiber composite material;
a second longitudinal member element configured from a fiber composite material; and
a connecting element configured to connect the first longitudinal member element and the second longitudinal element, wherein
the second longitudinal member element is arranged behind the first longitudinal member element and is connected to the first longitudinal member element via the connecting element, and
the longitudinal member arrangement is configured such that, in an event of a collision of the motor vehicle, the second longitudinal member element begins to fail after the first longitudinal member element has failed, whereby a progressive failure occurs that absorbs collision energy,

a bumper transverse member fastened to the longitudinal member arrangement.

15 . The body of the motor vehicle according to claim 14 , wherein
the first longitudinal member element has a triggering structure configured to reduce an initial failure force level of the first longitudinal member element, whereby the initial failure force level of the first longitudinal member element is lower than the initial failure force level of the second longitudinal member element.

16 . The body of the motor vehicle according to claim 15 , wherein
at least one connecting region of the first longitudinal member element and one connecting region of the second longitudinal member element have an identical cross-sectional shape, an identical wall thickness and/or an identical material composition.

17 . The body of the motor vehicle according to claim 16 , wherein
a predetermined failure section of the first longitudinal member element and a predetermined failure section of the second longitudinal member element have an identical cross-sectional shape, an identical wall thickness and/or an identical material composition.

18 . The body of the motor vehicle according to claim 17 , wherein
the connecting element is configured so as to support a front end side of the second longitudinal member element and to support a rear end side of the first longitudinal member element.

19 . The body of the motor vehicle according to claim 18 , wherein
the connecting element has a wall, on a front side of which the rear end side of the first longitudinal member element is supported and/or on a rear side of which the front end side of the second longitudinal member element is supported.

20 . The body of the motor vehicle according to claim 19 , wherein
the connecting element has a first sleeve section which engages around a rear end of the first longitudinal member element, and/or has a first projection section which is enclosed by the rear end of the first longitudinal memb

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Fodor Balazs

Classifications

• B60Y2306/01

  Reducing damages in case of crash, e.g. by improving battery protection · CPC title

• B62D21/15

  having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body (bumpers B60R19/02; shock absorbers in general F16F) · CPC title

• B62D29/04 Primary

  predominantly of synthetic material (working of plastics or substances in a plastic state B29) · CPC title

• B62D29/005

  preformed metal and synthetic material elements being joined together, e.g. by adhesives · CPC title

• B62D29/041

  Understructures · CPC title