WO2005061285A1 - Impact kinetic energy absorbing device - Google Patents

Impact kinetic energy absorbing device Download PDF

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Publication number
WO2005061285A1
WO2005061285A1 PCT/FR2004/050590 FR2004050590W WO2005061285A1 WO 2005061285 A1 WO2005061285 A1 WO 2005061285A1 FR 2004050590 W FR2004050590 W FR 2004050590W WO 2005061285 A1 WO2005061285 A1 WO 2005061285A1
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WO
WIPO (PCT)
Prior art keywords
housing
configuration
vehicle
shell
shells
Prior art date
Application number
PCT/FR2004/050590
Other languages
French (fr)
Inventor
Denise Morisset
Hervé PRUVOT
Laurent Portier
Philippe Martz
Original Assignee
Renault S.A.S.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault S.A.S. filed Critical Renault S.A.S.
Priority to JP2006544509A priority Critical patent/JP2007514598A/en
Priority to EP04805833A priority patent/EP1697180A1/en
Publication of WO2005061285A1 publication Critical patent/WO2005061285A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N3/00—Arrangements or adaptations of other passenger fittings, not otherwise provided for
    • B60N3/06—Arrangements or adaptations of other passenger fittings, not otherwise provided for of footrests
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N3/00—Arrangements or adaptations of other passenger fittings, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members

Definitions

  • the invention relates to a device for absorbing kinetic energy from shock.
  • the invention relates more particularly to a device for absorbing the kinetic energy of an impact, a type which is intended to be arranged between a structural element and a passenger compartment of a motor vehicle for, in a first rest configuration , receive in support at least a part ⁇ 'a body of a passenger of the vehicle and which includes energy dissipation means capable of preventing, in a second configuration of vehicle shock, that damage to said part is caused of the body, numerous examples of shock absorption devices of this type are known.
  • the document FR-A1 -2,746,728 describes a footrest covering for a motor vehicle floor mat resting on a floor of said vehicle.
  • This coating is made of a partitioned thermopiastic cellular material which is intended to absorb the shocks to which the driver's feet could be subjected (or a violent shock causing deformation of the floor.
  • a coating has the disadvantage of retaining a residual volume not negligible after compression. This volume does not allow a good relationship between the starting volume and the absorption capacity of kinetic energy.
  • the document FR-A1-2,798,019 describes and represents a footrest for a motor vehicle comprising a rigid sole fixed to the vehicle floor by means of deformable fixing means, such a footrest improves the rigidity of the support offered to the foot, but still retains a significant residual volume after the impact.
  • the invention proposes a device for absorbing kinetic energy having only extremely compact dimensions when impacted.
  • the invention provides a device for absorbing the kinetic energy of an impact of the type described above, characterized in that it comprises a housing which is formed from the union of two hollow shells and which, in the first configuration, is rigid, and which is capable, in the second configuration, of being crushed while occupying a minimum residual volume, the two shells crushing towards one another when the shoemaker is requested by the part to body during shock.
  • each shell and housing has the shape of a parallelepiped, one open face of which faces the other shell and the sides of each shell are liable to compact in response to stresses from compression, bending or shearing to crush the two shells towards each other
  • each shell ⁇ u housing is made of a material which has high resistance characteristics when subjected to a mechanical stress of intensity less than a determined threshold value, and which disintegrates when it is subjected to a mechanical stress of intensity greater than the determined threshold value, the material comprises a matrix, in particular thermoplastic, entangled with fibers, in particular long glass fibers.
  • FIG. 1 is a perspective view of the interior of a passenger compartment of a motor vehicle comprising a kinetic energy absorption device according to the invention
  • - Figure 2 is a schematic sectional view of a kinetic energy absorption device according to the invention shown in the first configuration
  • - Figure 3 is a schematic sectional view of the kinetic energy absorption device shown according to the second configuration.
  • identical reference numerals designate identical parts or having similar functions.
  • the terms “upper” or “lower” respectively designate elements or positions oriented respectively upwards or downwards in FIGS. 1 to 3, FIG.
  • PhabitacSe 10 comprises in particular a driving position 12 including an element 14 of structure, in particular floor 14 supports a covering 18.
  • the covering 16 comprises for example a carpet 18 under which is arranged, in line with a pedals 20 of the vehicle, a kinetic energy absorption device 22 which rests on the floor 14.
  • This configuration is not limiting of the invention, and it will be understood that the kinetic energy absorption device can be arranged to any place of the structural element 14, and in particular any place on the floor 14 of the vehicle.
  • the device 22 is not necessarily arranged in line with the bottom bracket 20, but i l can be arranged under a footrest 24 of the passenger compartment or under a place mat (not shown) for a passenger of the vehicle other than the driver.
  • the device 22 for absorbing kinetic energy is intended to receive at least part of the body of a passenger of the vehicle, for example a foot, and it includes means for dissipating energy capable to avoid, in a second shock configuration of the vehicle, that are caused damage to said part of the body and in particular to the said foot.
  • the invention proposes a new device 22 for absorbing kinetic energy comprising a housing which is formed by the union of two hollow shells 24 and 26.
  • the box forms the entire support 22, but this configuration is not limitative of the invention, and it will be understood that the box could constitute only part of the support 22.
  • the support 22 can in particular be made up of a set of boxes independent of each other.
  • the support 22 In the first configuration which has been shown in Figure 2, the support 22 is rigid, so that it can allow the feet of the driver or a passenger passageru vehicle to rest without deforming. The support 22 then occupies a first determined volume "V,”.
  • the support 22 In the second configuration which has been represented in FIG. 3, the support 22 is liable to be crushed by occupying a second minimum residual volume "V 2 ", the two shells 24 and 28 crushing towards each other when the housing 22 is compressed between the foot and the floor BU during the impact.
  • each shell 24, 28 of the housing has the form of a parallelepiped of which an open face 28, 30 is turned towards the other shell 24, 26.
  • each shell 24, 28 or housing is made of a material which exhibits high resistance characteristics when it is subjected to a mechanical stress of intensity lower than a determined threshold value, and which disintegrates when it is subject to mechanical stress of intensity greater than the determined threshold value.
  • this material can in particular be provided so that only the sides 32, 34 fall apart when the shells 24, 26 are subjected to mechanical stress of intensity greater than the determined threshold value.
  • the material of which they are made preferably comprises a matrix, in particular thermoplastic, entangled with fibers, in particular long glass fibers
  • the invention therefore makes it possible to obtain a device 22 for kinetic energy absorption which is both rigid in the rest configuration and which occupies a minimum residual volume "Va" after an impact, the minimum residual volume "Va” corresponding substantially to the thickness of the shells 24 and 26 at their open faces 28, 30,
  • the device 22 for absorbing kinetic energy can be used at different locations in the structure of the vehicle such as for example sides of the passenger compartment or doors.

Abstract

The invention relates to a device (22) for absorbing an impact kinetic energy, which is disposed between the structural element and the cabin of a motor vehicle in order to support at least one part of the body of the vehicle passenger in the first resting position and which comprises energy dissipating means for avoiding injuries of said part of the body in the second, vehicle impact position. The inventive device is characterised in that it comprises a housing which is formed by joining two hollow shells (24, 26), is embodied such that it is rigid in the first position by occupying a first determined volume (V1) and is breakable in the second position by occupying a second residual minimum volume. Said two shells (24, 26) are breakable against each other when the housing is pressed by said part of the body during impact.

Description

"Dispositif d'absorption de {'énergie cinétique cfurï choc" L'invention concerne un dispositif d'absorption de l'énergie cinétique d'un choc. L'invention concerne plus particulièrement un dispositif d'absorption de l'énergie cinétique d'un choc, a type qui est destiné à être agencé entre un élément de structure et un habitacle d'un véhicule automobile pour, dans une première configuration de repos, recevoir an appui au moins une partie ά'un corps d'un passager du véhicule et qui comporte des moyens de dissipation d'énergie aptes à éviter, dans une seconde configuration de choc du véhicule, que ne soient occasionnées des lésions à ladite partie du corps, On connaît de nombreux exemples de dispositifs d'absorption de choc de ce type, Le document FR-A1 -2.746.728 décrit un revêtement repose-pieds pour un tapis de sol de véhicule automobile reposant sur un plancher dudît véhicule. Ce revêtement est réalisé en un matériau cellulaire thermopiastique cloisonné qui est destiné à absorber les chocs auxquels les pieds du conducteur pourraient être soumis (ors d'un choc violent occasionnant une déformation du plancher. Un tel revêtement présente l'inconvénient de conserver un volume résiduel non négligeable après compression. Ce volume ne permet pas d'avoir un bon rapport entre le volume de départ et la capacité d'absorption de l'énergie cinétique. Le document FR-A1-2.798,019 décrit et représente un repose-pied pour un véhicule automobile comportant une semelle rigide fixée au plancher du véhicule par l'intermédiaire de moyens de fixation déformables. Un tel repose-pied améliore la rigidité άu support proposé au pied, mais conserve toujours après le choc un volume résiduel non négligeable. Four remédier à ces inconvénients l'invention propose un dispositif d'absorption d'énergie cinétique ne présentant quXm encombrement extrêmement réduit à l'Issue d'un choc. Dans ce but, l'invention propose un dispositif d'absorption de l'énergie cinétique d'un choc du type décrit précédemment, caractérisé en ce qu'il comporte un boîtier qui est formé de fa réunion de deux coques creuses et qui, dans la première configuration, est rigide, et qui est susceptible, dans la seconde configuration, de s'écraser en occupant un volume résiduel minimal, les deux coques s'écrasant l'une vers l'autre lorsque le bottier est sollicité par la partie au corps au cours du choc. Selon d'autres caractéristiques de l'Invention : - chaque coque e boîtier présente la forme d'un parallélépipède dont une face ouverte est tournée vers l'autre coque et les flancs de chaque coque sont susceptibles de se compacter en réponse à des sollicitations de compression, flexion ou cisaillement pour écraser les deux coques l'une vers l'autre, •» chaque coque άu boîtier est réalisée en un matériau qui présente des caractéristiques élevées de résistance lorsqu'il est soumis à une sollicitation mécanique d'intensité inférieure à une valeur de seuil déterminée, et qui se désagrège lorsqu'il est soumis â une sollicitation mécanique d'intensité supérieure à la valeur de seuil déterminée, le matériau comporte une matrice, notamment thermoplastiquβ, enchevêtrée de fibres, notamment des fibres longues de verre. D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels ; - la figure 1 est une vue en perspective de l'intérieur d'un habitacle de véhicule automobile comportant un dispositif d'absorption d'énergie cinétique selon l'invention ; - la figure 2 est une vue schématique en section d'un dispositif d'absorption d'énergie cinétique selon l'Invention représenté dans la première configuration ; - la figure 3 est une vue schématique en section du dispositif d'absorption d'énergie cinétique représenté selon la seconde configuration. Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires. Par convention, les termes "supérieur" ou "inférieur" désignent respectivement des éléments ou des positions orientés respectivement vers le haut ou le bas des figures 1 à 3, On a représenté à la figure 1 l'ensemble d'un habitacle 10 de véhicule automobile, De manière connue, PhabitacSe 10 comporte notamment un poste de conduite 12 dont un élément 14 de structure, notamment plancher 14 supporte un revêtement 18. Le revêtement 16 comporte par exemple un tapis 18 sous lequel est agencé, au droit d'un pédalier 20 du véhicule, un dispositif 22 d'absorption d'énergie cinétique qui repose sur le plancher 14, Cette configuration n'est pas limitative de l'Invention, et il sera compris que dispositif d'absorption d'énergie cinétique peut être agencé à n'importe quel endroit de ('élément 14 de structure, et notamment à n'importe quel endroit û plancher 14 au véhicule. En particulier, le dispositif 22 n'est pas nécessairement agencé au doit du pédalier 20, mais il peut être agencé sous un repose-pied 24 de Phabitacle ou sous un tapis d' ne place (non représentée) ά'un passager du véhicule autre que le conducteur. Dans une première configuration de repos, le dispositif 22 d'absorption d'énergie cinétique est destiné à recevoir au moins une partie du corps d'un passager du véhicule, par exemple un pied, et il comporte des moyens de dissipation d'énergie aptes à éviter, dans une seconde configuration de choc du véhicule, que ne soient occasionnées des lésions à ladite partie au corps et en particulier au dit pied. Comme l'illustre la figure 2, l'invention propose un nouveau dispositif 22 d'absorption d'énergie cinétique comportant un boîtier qui est formé de la réunion de deux coques 24 et 26 creuses. Sur les figures, le boîtier forme l'intégralité au support 22, mais cette configuration n'est pas limitative de l'invention, et il sera compris que le boîtier pourrait ne constituer qu'une partie du support 22. Le support 22 peut notamment être constitué d'un ensemble de boîtiers indépendants les uns des autres. Dans la première configuration qui a été représentée à la figure 2, le support 22 est rigide, de sorte qu'il peut permettre le repos des pieds du conducteur ou d'un passager ύu véhicule sans se déformer. Le support 22 occupe alors un premier volume "V," déterminé. Dans la seconde configuration qui a été représentée à la figure 3, le support 22 est susceptible de s'écraser en occupant un second volume "V2" résiduel minimal, les deux coques 24 et 28 s'écrasant l'une vers l'autre lorsque le boîtier 22 est comprimé entre le pied et le plancher BU cours du choc. Dans la seconde configuration, le volume "V2" peut notamment être réduit à l'épaisseur cumulée des deux parois des coques 24 et 26. Dans le mode de réalisation préféré de j'înventîon, chaque coque 24, 28 du boîtier présente la forme d'un parallélépipède dont une face ouverte 28, 30 est tournée vers l'autre coque 24, 26. Pour permettre l'écrasement des coques 24, 26 du support"Device for absorbing kinetic energy from shock" The invention relates to a device for absorbing kinetic energy from shock. The invention relates more particularly to a device for absorbing the kinetic energy of an impact, a type which is intended to be arranged between a structural element and a passenger compartment of a motor vehicle for, in a first rest configuration , receive in support at least a part ά'a body of a passenger of the vehicle and which includes energy dissipation means capable of preventing, in a second configuration of vehicle shock, that damage to said part is caused of the body, numerous examples of shock absorption devices of this type are known. The document FR-A1 -2,746,728 describes a footrest covering for a motor vehicle floor mat resting on a floor of said vehicle. This coating is made of a partitioned thermopiastic cellular material which is intended to absorb the shocks to which the driver's feet could be subjected (or a violent shock causing deformation of the floor. Such a coating has the disadvantage of retaining a residual volume not negligible after compression. This volume does not allow a good relationship between the starting volume and the absorption capacity of kinetic energy. The document FR-A1-2,798,019 describes and represents a footrest for a motor vehicle comprising a rigid sole fixed to the vehicle floor by means of deformable fixing means, such a footrest improves the rigidity of the support offered to the foot, but still retains a significant residual volume after the impact. To remedy these drawbacks, the invention proposes a device for absorbing kinetic energy having only extremely compact dimensions when impacted. To this end, the invention provides a device for absorbing the kinetic energy of an impact of the type described above, characterized in that it comprises a housing which is formed from the union of two hollow shells and which, in the first configuration, is rigid, and which is capable, in the second configuration, of being crushed while occupying a minimum residual volume, the two shells crushing towards one another when the shoemaker is requested by the part to body during shock. According to other characteristics of the invention: - each shell and housing has the shape of a parallelepiped, one open face of which faces the other shell and the sides of each shell are liable to compact in response to stresses from compression, bending or shearing to crush the two shells towards each other, • »each shell άu housing is made of a material which has high resistance characteristics when subjected to a mechanical stress of intensity less than a determined threshold value, and which disintegrates when it is subjected to a mechanical stress of intensity greater than the determined threshold value, the material comprises a matrix, in particular thermoplastic, entangled with fibers, in particular long glass fibers. Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which; - Figure 1 is a perspective view of the interior of a passenger compartment of a motor vehicle comprising a kinetic energy absorption device according to the invention; - Figure 2 is a schematic sectional view of a kinetic energy absorption device according to the invention shown in the first configuration; - Figure 3 is a schematic sectional view of the kinetic energy absorption device shown according to the second configuration. In the following description, identical reference numerals designate identical parts or having similar functions. By convention, the terms “upper” or “lower” respectively designate elements or positions oriented respectively upwards or downwards in FIGS. 1 to 3, FIG. 1 represents the whole of a passenger compartment 10 of a vehicle automobile, In a known manner, PhabitacSe 10 comprises in particular a driving position 12 including an element 14 of structure, in particular floor 14 supports a covering 18. The covering 16 comprises for example a carpet 18 under which is arranged, in line with a pedals 20 of the vehicle, a kinetic energy absorption device 22 which rests on the floor 14. This configuration is not limiting of the invention, and it will be understood that the kinetic energy absorption device can be arranged to any place of the structural element 14, and in particular any place on the floor 14 of the vehicle. In particular, the device 22 is not necessarily arranged in line with the bottom bracket 20, but i l can be arranged under a footrest 24 of the passenger compartment or under a place mat (not shown) for a passenger of the vehicle other than the driver. In a first resting configuration, the device 22 for absorbing kinetic energy is intended to receive at least part of the body of a passenger of the vehicle, for example a foot, and it includes means for dissipating energy capable to avoid, in a second shock configuration of the vehicle, that are caused damage to said part of the body and in particular to the said foot. As illustrated in FIG. 2, the invention proposes a new device 22 for absorbing kinetic energy comprising a housing which is formed by the union of two hollow shells 24 and 26. In the figures, the box forms the entire support 22, but this configuration is not limitative of the invention, and it will be understood that the box could constitute only part of the support 22. The support 22 can in particular be made up of a set of boxes independent of each other. In the first configuration which has been shown in Figure 2, the support 22 is rigid, so that it can allow the feet of the driver or a passenger passageru vehicle to rest without deforming. The support 22 then occupies a first determined volume "V,". In the second configuration which has been represented in FIG. 3, the support 22 is liable to be crushed by occupying a second minimum residual volume "V 2 ", the two shells 24 and 28 crushing towards each other when the housing 22 is compressed between the foot and the floor BU during the impact. In the second configuration, the volume "V 2 " can in particular be reduced to the cumulative thickness of the two walls of the shells 24 and 26. In the preferred embodiment of the invention, each shell 24, 28 of the housing has the form of a parallelepiped of which an open face 28, 30 is turned towards the other shell 24, 26. To allow the crushing of the shells 24, 26 of the support
22 l'une vers l'autre, les flancs 32, 34 de chaque coque 24, 28 sont susceptibles de se compacter en réponse â des sollicitations de compression, flexion ou cisaillement. Plus particulièrement, chaque coque 24, 28 u boîtier est réalisée en un matériau qui présente des caractéristiques élevées de résistance lorsqu'il est soumis à une sollicitation mécanique d'intensité inférieure è une valeur de seuil déterminée, et qui se désagrège lorsqu'il est soumis à une sollicitation mécanique d'intensité supérieure à la valeur de seuil déterminée. En particulier, ce matériau peut notamment être prévu pour que seuls les flancs 32, 34 se désagrègent lorsque les coques 24, 26 sont soumises à la sollicitation mécanique d'intensité supérieure à la valeur de seuil déterminée. Pour obtenir un tel comportement des coques 24, 28, le matériau dont elles sont constituées comporte de préférence une matrice, notamment thermoplastique, enchevêtrée de fibres, notamment des fibres longues de verre, l'invention permet donc d'obtenir un dispositif 22 d'absorption d'énergie cinétique qui est â la fois rigide en configuration de repos et qui occupe un volume "Va" résiduel minimal à l'issue d'un choc, le volume "Va" résiduel minimal correspondant sensiblement à l'épaisseur des coques 24 et 26 au niveau de leurs faces ouvertes 28, 30, Sans modifier l'objet de l'invention, le dispositif 22 d'absorption d'énergie cinétique peut être utilisé à différents emplacements de la structure du véhicule tels que par exemple des côtés de l'habitacle ou des portes. 22 towards each other, the sides 32, 34 of each shell 24, 28 are capable of compacting in response to compressive, bending or shearing stresses. More particularly, each shell 24, 28 or housing is made of a material which exhibits high resistance characteristics when it is subjected to a mechanical stress of intensity lower than a determined threshold value, and which disintegrates when it is subject to mechanical stress of intensity greater than the determined threshold value. In particular, this material can in particular be provided so that only the sides 32, 34 fall apart when the shells 24, 26 are subjected to mechanical stress of intensity greater than the determined threshold value. To obtain such behavior of the shells 24, 28, the material of which they are made preferably comprises a matrix, in particular thermoplastic, entangled with fibers, in particular long glass fibers, the invention therefore makes it possible to obtain a device 22 for kinetic energy absorption which is both rigid in the rest configuration and which occupies a minimum residual volume "Va" after an impact, the minimum residual volume "Va" corresponding substantially to the thickness of the shells 24 and 26 at their open faces 28, 30, Without modifying the object of the invention, the device 22 for absorbing kinetic energy can be used at different locations in the structure of the vehicle such as for example sides of the passenger compartment or doors.

Claims

REVENDICATIONS 1 , Dispositif (22) d'absorption de l'énergie cinétique d'un choc, du type qui est destiné à être agencé entre un élément (14) de structure et un habitacle (10) d'un véhicule automobile pour, dans une première configuration de repos, recevoir en appui au moins une partie du corps d'un passager du véhicule et qui comporte des moyens de dissipation d'énergie aptes à éviter, dans une seconde configuration de choc du véhicule, que ne soient occasionnées des lésions à ladite partie du corps, caractérisé en ce qu'il comporte un boîtier qui est formé de la réunion de ύeux coques (24, 28) creuses et qui, dans la première configuration, est rigide en occupant un premier volume (Vi) déterminé, et qui est susceptible, dans la seconde configuration, de s'écraser en occupant un second volume (V2) résiduel minimal, les deux coques (24, 26} s'écrasant l'une vers l'autre lorsque le boîtier est sollicité par ladite partie du corps au cours du choc. 2. Dispositif (22) selon la revendication précédente, caractérisé en ce que chaque coque (24, 28} du boîtier présente la forme d'un parallélépipède dont une face (28, 30) ouverte est tournée vers l'autre coque (24, 26) et en ce que les flancs (32, 34) de chaque coque (24, 26) sont susceptibles de se compacter en réponse à des sollicitations de compression, flexion ou cisaillement pour écraser les deux coques (24, 28) l'une vers l'autre. 3. Dispositif (22) selon l'une des revendications 1 ou 2, caractérisé en ce que chaque coque (24, 20) du boîtier est réalisée en un matériau qui présente des caractéristiques élevées de résistance lorsqu'il est soumis à une sollicitation mécanique d'intensité inférieure à une valeur de seuil déterminée, et qui se désagrège lorsqu'il est soumis à une sollicitation mécanique d'intensité supérieure à la valeur de seuil déterminée. 4. Dispositif (22) selon la revendication précédente, caractérisé en ce que le matériau comporte une matrice, notamment thermoplastique, enchevêtrée de fibres, notamment des fibres longues de s/erre. CLAIMS 1, Device (22) for absorbing the kinetic energy of an impact, of the type which is intended to be arranged between a structural element (14) and a passenger compartment (10) of a motor vehicle for, in a first configuration of rest, receiving in support at least a part of the body of a passenger of the vehicle and which includes energy dissipation means capable of preventing, in a second configuration of shock of the vehicle, that injuries are caused to said part of the body, characterized in that it comprises a housing which is formed from the union of two hollow shells (24, 28) and which, in the first configuration, is rigid by occupying a first determined volume (Vi), and which is likely, in the second configuration, to crash while occupying a second minimum residual volume (V 2 ), the two shells (24, 26} crashing towards each other when the housing is stressed by said part of the body during the shock 2. Di spositif (22) according to the preceding claim, characterized in that each shell (24, 28} of the housing has the shape of a parallelepiped of which one open face (28, 30) faces the other shell (24, 26) and in that the sides (32, 34) of each shell (24, 26) are capable of compacting in response to compressive, bending or shearing stresses in order to crush the two shells (24, 28) one towards the 'other. 3. Device (22) according to one of claims 1 or 2, characterized in that each shell (24, 20) of the housing is made of a material which has high resistance characteristics when subjected to mechanical stress of intensity lower than a determined threshold value, and which disintegrates when subjected to a mechanical stress of intensity higher than the determined threshold value. 4. Device (22) according to the preceding claim, characterized in that the material comprises a matrix, in particular thermoplastic, entangled with fibers, in particular long ground fibers.
PCT/FR2004/050590 2003-12-19 2004-11-16 Impact kinetic energy absorbing device WO2005061285A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006544509A JP2007514598A (en) 2003-12-19 2004-11-16 Impact kinetic energy absorber
EP04805833A EP1697180A1 (en) 2003-12-19 2004-11-16 Impact kinetic energy absorbing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315059A FR2863982B1 (en) 2003-12-19 2003-12-19 DEVICE FOR ABSORPTING THE KINETIC ENERGY OF A SHOCK
FR0315059 2003-12-19

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WO2005061285A1 true WO2005061285A1 (en) 2005-07-07

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EP (1) EP1697180A1 (en)
JP (1) JP2007514598A (en)
KR (1) KR20070026371A (en)
FR (1) FR2863982B1 (en)
WO (1) WO2005061285A1 (en)

Citations (7)

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DE19522575A1 (en) * 1994-06-27 1996-01-04 Lw Composite Gmbh & Co Impact absorbing device for motor vehicle
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US20020060462A1 (en) * 1998-07-02 2002-05-23 Glance Patrick M. Bumper beam absorber
US6142563A (en) * 1998-10-09 2000-11-07 Joalto Design Vehicle seat with energy absorbing deformable structural material
US6550850B2 (en) * 2000-10-09 2003-04-22 Sai Automotive Allibert Industrie Device for absorbing energy during impact, and motor vehicle door comprising such a device
WO2002102460A2 (en) * 2001-06-19 2002-12-27 Oakwood Energy Management, Inc. Composite energy absorber

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KR20070026371A (en) 2007-03-08
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FR2863982B1 (en) 2006-05-19
EP1697180A1 (en) 2006-09-06

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