WO2008149044A2 - Energy absorption assembly provided with two absorption devices - Google Patents

Energy absorption assembly provided with two absorption devices Download PDF

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Publication number
WO2008149044A2
WO2008149044A2 PCT/FR2008/050956 FR2008050956W WO2008149044A2 WO 2008149044 A2 WO2008149044 A2 WO 2008149044A2 FR 2008050956 W FR2008050956 W FR 2008050956W WO 2008149044 A2 WO2008149044 A2 WO 2008149044A2
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WO
WIPO (PCT)
Prior art keywords
deformation
energy absorbing
absorbing device
assembly
energy
Prior art date
Application number
PCT/FR2008/050956
Other languages
French (fr)
Other versions
WO2008149044A3 (en
Inventor
Frédéric Pineau
Julien Meghira
Original Assignee
Faurecia Sièges d'Automobile
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.)
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38949741&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2008149044(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Faurecia Sièges d'Automobile filed Critical Faurecia Sièges d'Automobile
Priority to DE112008001976.2T priority Critical patent/DE112008001976B4/en
Publication of WO2008149044A2 publication Critical patent/WO2008149044A2/en
Publication of WO2008149044A3 publication Critical patent/WO2008149044A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/427—Seats or parts thereof displaced during a crash
    • B60N2/42709—Seats or parts thereof displaced during a crash involving residual deformation or fracture of the structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/42—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats
    • B60N2/4207—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces
    • B60N2/4214—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles the seat constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats characterised by the direction of the g-forces longitudinal

Definitions

  • the invention relates to an energy absorbing assembly by deformation in case of impact, in particular for a motor vehicle seat.
  • the invention further relates to a seat comprising the energy absorbing assembly.
  • Such an assembly is preferably disposed between the backrest and the seat. It is intended to reduce the stresses to the occupant of the vehicle sitting on the seat by gradually absorbing the kinetic energy to which his body is subjected.
  • the invention is more particularly intended for the absorption of energy in the event of a rear impact, but is also applicable to an impact before or even to other types of impact.
  • seats comprising a seat and a backrest, said seats being equipped with an energy absorbing device disposed between the seat and the backrest so as to absorb the forces exerted on the backrest.
  • Such seats are described in particular in documents US 2004/061 364, DE 198 07 581, EP 1 547 857 and DE 199 44 635.
  • the assembly comprises a first energy absorbing device and a second energy absorbing device intended to be interposed between a first element and a second element in order to maintain them. relative to one another by absorbing high stresses exerted between said first and second members, said first energy absorbing device and said second absorbing device being arranged in series and capable of being staged direction of deformation in case of stress exerted on the energy absorbing assembly.
  • said first energy absorbing device has a resistance to deformation less than the resistance to deformation of the second energy absorbing device.
  • the resistance to deformation is similar to a stiffness and determines the range of displacement of the seat to dampen an impact.
  • a first energy absorption device of moderate stiffness in the event of a shock at a low speed, the deformation of the first energy absorption device will allow, by a relatively large amplitude of deformation, to reduce the deceleration experienced by the occupant.
  • a second high stiffness energy absorbing device in the event of a high speed impact, the reduced deformation of the second energy absorbing device will reduce the risk of the occupant coming into contact with an obstacle to the energy absorption device. interior of the cockpit.
  • the first energy absorbing device has a lower deformation resistance between 1.5 times and 3 times the deformation resistance of the second energy absorbing device.
  • the mechanical differences thus make it possible to have at least one of the two devices that are well adapted to the type of shock undergone, while avoiding, in the event of a high speed impact, that the moderate stiffness of the first energy absorption device generates a excessive amplitude of displacement and / or a sudden variation in the deceleration.
  • the first energy absorbing device preferably comprises a one-piece piece having an elongated slot separating a first portion and a second portion facing each other, said light extending transversely to the direction of deformation and having a substantially constant width.
  • the effort to bring said first and second portions into contact with each other by deformation is preferably less than the force required to plastically deform the second energy absorbing device.
  • the second energy absorbing device preferably comprises a plate having a succession of cuts succeeding one another in the direction of deformation and defining between them at least one bridge extending in one direction. of elongation transverse to the direction of deformation.
  • the first energy absorbing device is preferably disposed inside one of the cutouts.
  • the first energy absorbing device can thus move in the direction of deformation while being easily maintained in the other directions.
  • the invention further relates to a seat comprising, in addition to the aforementioned energy absorbing assembly, a first element and a second element, said absorption assembly being interposed between the first element and the second element, and the first device absorption being removable.
  • FIG. 1 represents a seat according to the invention, before impact
  • FIG. 2 represents, on an enlarged scale, in perspective, the area marked II in FIG. 1;
  • FIG. 3 represents zone II, on an enlarged scale, in section without the head of the screw;
  • FIG. 4 is a representation according to FIG. 3, during a low speed shock
  • FIG. 5 is a representation according to FIG. 3, after a low speed shock
  • FIG. 6 is a representation according to Figure 3 after a high speed shock.
  • FIG. 1 illustrates a seat 10 of a motor vehicle essentially comprising a structure seat 24, a fastening screw 6 integral with the seat structure 24, an adapter 8, a backrest structure 26, a rotary articulation device 30 and an energy absorbing assembly 1.
  • the device 30 is interposed between the adapter 8 and the backrest structure 26. It adjusts the inclination of the backrest structure 26 relative to the seat structure 24.
  • the rotary articulation device 30 will not be detailed further.
  • the energy absorbing assembly 1 comprises a first energy absorbing device 2 and a second energy absorbing device 4 interposed between the seat structure 24 and the adapter 8. absorbing the energy of the occupant of the seat 10 in the event of shock, allowing a controlled rotation of the backrest structure 26 relative to the seat structure 24 by deformation.
  • the second energy absorbing device 4 is integrated in the adapter 8.
  • the adapter 8 is held on the seat structure 24 by means of a pivot 28 and the screw of fastening 6 screwed into the seat structure 24.
  • the adapter 8 is constituted by a shaped plate of substantially constant thickness, preferably of the order of 2 to 3 millimeters.
  • the second energy absorbing device 4 is located in an extreme portion of the adapter remote from the pivot 28. As shown more precisely in FIG. 3, it has a succession of cuts 20a, 20b, 20c, in the illustrated example three cuts, succeeding in a direction of deformation X substantially rectilinear.
  • the direction of deformation X extends substantially circumferentially with respect to the pivot 28, with a slight deviation due to a planned overall deformation of the adapter 8.
  • the cutouts 20a, 20b, 20c define between them bridges 22a, 22b, two in number in the illustrated embodiment.
  • the bridges 22a, 22b extend in an elongation direction Y and have in the direction of deformation X a width which is substantially constant over their entire length, with however a restriction at their ends.
  • the first energy absorbing device 2 is substantially in the form of a one-piece piece having a symmetry with respect to a median plane perpendicular to the elongation direction Y. It is disposed in the end cutout 20a, in which it is held in the deformation direction X between the screw shank 6 and the bridge 20a, in the elongation direction Y by the edges of the cutout 20a and perpendicular to the deformation direction X and to the elongation direction Y between the seat structure 24 and the head of the screw 6, as shown in Figure 2.
  • the first energy absorbing device 2 has substantially a disc shape having cutouts therethrough and defining a housing receiving the screw 6 and an elongate slot 12 extending opposite and in the vicinity of the bridge 22a.
  • the lumen 12 extends substantially in the direction of elongation Y. It is entirely included inside the first energy absorbing device 2, so that it delimits a main portion 14 and a deformation portion 16 connected to each other by two strips of material.
  • the deformation portion 16 has a substantially constant width, so that the light 12 is slightly arched.
  • the first absorption device of energy 2 and the second energy absorbing device 4 are distinct from one another and arranged in series, one behind the other in the direction of deformation X. As illustrated in FIG. they are solicited staged in case of shock. As long as the deformation portion 16 of the first energy absorbing device 2 is distant from the main portion 14, the first energy absorbing device 2 has a moderate resistance to deformation, while the second deformation device 16 energy absorption 4 has a relatively high resistance to deformation.
  • the first energy absorbing device 2 and the second energy absorbing device 4 then contribute to absorbing the energy of the shock.
  • the deformation portion 16 of the first energy absorbing device 2 is distant from the main portion 14, the deformation resistance of the first energy absorbing device 2 is sufficiently low for the second energy absorbing device 4 is deformed elastically.
  • the first energy absorbing device 2 is plastically deformed, the light 12 remaining permanently crushed, but the second energy absorbing device 2 energy 4 is intact, the bridge 22a having resumed its initial shape by springback.
  • the first used energy absorption device 2 is removed and replaced by a new device in the cut 20a, so we give the seat 1 its initial level of security.
  • the first energy absorbing device 2 then deforms substantially more, so that the resistance to deformation of the assembly 1 is then substantially that of the second energy absorbing device 4.
  • the bridge 22a then possibly the bridge 22b according to the importance of the shock, is deformed plastically, possibly until breaking.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)
  • Vibration Dampers (AREA)

Abstract

Assembly for absorbing energy by deformation, in particular for a seat of a motor vehicle in case of impact, said assembly comprising a first energy absorption device (2) and a second energy absorption device (4) that are intended to be inserted between a first element (6) and a second element (8) in order to hold them relative to each other while absorbing high stresses exerted between said first element (6) and second element (8), said first energy absorption device (2) and said second absorption device (4) being positioned in series and able to be loaded in a staged manner in a direction of deformation in the event of stress being exerted on the energy absorption assembly.

Description

Ensemble d'absorption d'énergie muni de deux dispositifs d'absorption Energy absorbing assembly with two absorption devices
L'invention concerne un ensemble d'absorption d'énergie par déformation en cas de choc, en particulier pour siège de véhicule automobile. L'invention concerne en outre un siège comprenant l'ensemble d'absorption d' énergie.The invention relates to an energy absorbing assembly by deformation in case of impact, in particular for a motor vehicle seat. The invention further relates to a seat comprising the energy absorbing assembly.
Un tel ensemble est disposé de préférence entre le dossier et l'assise. Il est destiné à réduire les contraintes subies par l'occupant du véhicule assis sur le siège en absorbant progressivement l'énergie cinétique auquel son corps est soumis. L'invention est plus particulièrement destinée à l'absorption d'énergie en cas de choc arrière, mais est également applicable à un choc avant, voire à d'autres types de chocs.Such an assembly is preferably disposed between the backrest and the seat. It is intended to reduce the stresses to the occupant of the vehicle sitting on the seat by gradually absorbing the kinetic energy to which his body is subjected. The invention is more particularly intended for the absorption of energy in the event of a rear impact, but is also applicable to an impact before or even to other types of impact.
On connait de manière usuelle des sièges comprenant une assise et un dossier, lesdits sièges étant équipés d'un dispositif d'absorption d'énergie disposé entre l'assise et le dossier de manière à absorber les efforts s ' exerçant sur le dossier. De tels sièges sont décrits notamment dans les documents US 2004/061 364, DE 198 07 581, EP 1 547 857 et DE 199 44 635.It is customary to know seats comprising a seat and a backrest, said seats being equipped with an energy absorbing device disposed between the seat and the backrest so as to absorb the forces exerted on the backrest. Such seats are described in particular in documents US 2004/061 364, DE 198 07 581, EP 1 547 857 and DE 199 44 635.
L'invention vise à proposer un ensemble permettant de mieux s'adapter à la diversité des chocs. Pour ce faire, conformément à l'invention l'ensemble comprend un premier dispositif d'absorption d'énergie et un deuxième dispositif d'absorption d'énergie destinés à être interposés entre un premier élément et un deuxième élément afin de les maintenir l'un par rapport à l'autre en absorbant des contraintes élevées exercées entre lesdits premier et deuxième éléments, ledit premier dispositif d'absorption d'énergie et ledit deuxième dispositif d'absorption étant disposés en série et aptes à être sollicités de façon étagée suivant une direction de déformation en cas de contrainte s ' exerçant sur l'ensemble d'absorption d' énergie .The invention aims to provide a set to better adapt to the variety of shocks. To do this, according to the invention the assembly comprises a first energy absorbing device and a second energy absorbing device intended to be interposed between a first element and a second element in order to maintain them. relative to one another by absorbing high stresses exerted between said first and second members, said first energy absorbing device and said second absorbing device being arranged in series and capable of being staged direction of deformation in case of stress exerted on the energy absorbing assembly.
La présence de deux dispositifs d'absorption d'énergie disposés en série pour être sollicités de façon étagée permet notamment en leur conférant des caractéristiques mécaniques différentes de procurer une absorption adaptée à la nature du choc. L'un des dispositifs étant essentiellement sollicité pour un type de choc et l'autre étant sollicité pour un autre type de choc. Les différents types de choc pouvant se différencier notamment par l'amplitude et la durée de la décélération engendrée .The presence of two energy absorption devices arranged in series to be solicited in a stepped manner makes it possible in particular by conferring on them different mechanical characteristics to provide an absorption adapted to the nature of the impact. One of the devices being essentially biased for one type of shock and the other being biased for another type of shock. The different types of shock that can differentiate in particular by the amplitude and duration of the deceleration generated.
Selon une autre caractéristique conforme à l'invention, de préférence ledit premier dispositif d'absorption d'énergie présente une résistance à la déformation inférieure à la résistance à la déformation du deuxième dispositif d'absorption d'énergie.According to another characteristic according to the invention, preferably said first energy absorbing device has a resistance to deformation less than the resistance to deformation of the second energy absorbing device.
La résistance à la déformation est analogue à une raideur et détermine l'amplitude de déplacement du siège pour amortir un choc. En utilisant un premier dispositif d'absorption d'énergie de raideur modérée, en cas de choc à basse vitesse, la déformation du premier dispositif d'absorption d'énergie va permettre par une relativement grande amplitude de déformation de réduire la décélération subie par l'occupant. En utilisant un deuxième dispositif d'absorption d'énergie de raideur élevée, en cas de choc à haute vitesse, la déformation réduite du deuxième dispositif d'absorption d'énergie va réduire le risque que l'occupant vienne heurter un obstacle à l'intérieur de l'habitacle.The resistance to deformation is similar to a stiffness and determines the range of displacement of the seat to dampen an impact. By using a first energy absorption device of moderate stiffness, in the event of a shock at a low speed, the deformation of the first energy absorption device will allow, by a relatively large amplitude of deformation, to reduce the deceleration experienced by the occupant. By using a second high stiffness energy absorbing device, in the event of a high speed impact, the reduced deformation of the second energy absorbing device will reduce the risk of the occupant coming into contact with an obstacle to the energy absorption device. interior of the cockpit.
De préférence, le premier dispositif d'absorption d'énergie présente une résistance à la déformation inférieure entre 1,5 fois et 3 fois la résistance à la déformation du deuxième dispositif d'absorption d'énergie. Les différences mécaniques permettent ainsi d'avoir au moins l'un des deux dispositifs bien adaptés au type de choc subi, tout en évitant en cas de choc à haute vitesse que la raideur modérée du premier dispositif d'absorption d'énergie ne génère une amplitude de déplacement trop importante et/ou une variation brutale dans la décélération .Preferably, the first energy absorbing device has a lower deformation resistance between 1.5 times and 3 times the deformation resistance of the second energy absorbing device. The mechanical differences thus make it possible to have at least one of the two devices that are well adapted to the type of shock undergone, while avoiding, in the event of a high speed impact, that the moderate stiffness of the first energy absorption device generates a excessive amplitude of displacement and / or a sudden variation in the deceleration.
Selon une autre caractéristique conforme à l'invention, le premier dispositif d'absorption d'énergie comprend de préférence une pièce monobloc présentant une lumière allongée séparant une première portion et une deuxième portion en regard, ladite lumière s ' étendant transversalement à la direction de déformation et présentant une largeur sensiblement constante. Ainsi, en cas de choc à haute vitesse, la déformation du premier élément permet d'avoir une première phase de décélération modérée, puis lorsque les deux portions du premier élément sont au contact l'une de l'autre, seul le deuxième dispositif d'absorption d'énergie se déforme de sorte que la décélération est alors plus élevée.According to another characteristic according to the invention, the first energy absorbing device preferably comprises a one-piece piece having an elongated slot separating a first portion and a second portion facing each other, said light extending transversely to the direction of deformation and having a substantially constant width. Thus, in the event of a high-speed impact, the deformation of the first element makes it possible to have a first moderate deceleration phase, and then when the two portions of the first element are in contact with each other, only the second device energy absorption is deformed so that the deceleration is then higher.
Selon une caractéristique complémentaire, l'effort pour amener lesdites première et deuxième portions au contact l'une de l'autre par déformation est de préférence inférieur à l'effort nécessaire pour déformer plastiquement le deuxième dispositif d'absorption d'énergie.According to a complementary feature, the effort to bring said first and second portions into contact with each other by deformation is preferably less than the force required to plastically deform the second energy absorbing device.
Selon une autre caractéristique conforme à l'invention, le deuxième dispositif d'absorption d'énergie comprend de préférence une plaque présentant une succession de découpes se succédant suivant la direction de déformation et définissant entre elles au moins un pontet s ' étendant suivant une direction d'allongement transversale à la direction de déformation.According to another characteristic according to the invention, the second energy absorbing device preferably comprises a plate having a succession of cuts succeeding one another in the direction of deformation and defining between them at least one bridge extending in one direction. of elongation transverse to the direction of deformation.
Une telle solution est simple, robuste et efficace pour absorber l'énergie par déformation en cas de choc. Selon une caractéristique complémentaire conforme à l'invention, le premier dispositif d'absorption d'énergie est de préférence disposé à l'intérieur de l'une des découpes . Le premier dispositif d'absorption d'énergie peu ainsi se déplacer suivant la direction de déformation tout en étant aisément maintenu dans les autres directions .Such a solution is simple, robust and effective for absorbing energy by deformation in case of shock. According to a complementary feature according to the invention, the first energy absorbing device is preferably disposed inside one of the cutouts. The first energy absorbing device can thus move in the direction of deformation while being easily maintained in the other directions.
L'invention concerne en outre un siège comprenant, outre l'ensemble d'absorption d'énergie précité, un premier élément et un deuxième élément, ledit ensemble d'absorption étant interposé entre le premier élément et le deuxième élément, et le premier dispositif d'absorption étant amovible.The invention further relates to a seat comprising, in addition to the aforementioned energy absorbing assembly, a first element and a second element, said absorption assembly being interposed between the first element and the second element, and the first device absorption being removable.
Ainsi, en cas de détérioration du seul premier dispositif d'absorption d'énergie, celui-ci pourra être remplacé.Thus, in case of deterioration of the only first energy absorbing device, it may be replaced.
D'autres caractéristiques et avantages de la présente invention apparaîtront dans la description détaillée suivante, se référant aux dessins annexés dans lesquels :Other features and advantages of the present invention will become apparent from the following detailed description, with reference to the accompanying drawings in which:
- la figure 1 représente un siège conforme à l'invention, avant choc,FIG. 1 represents a seat according to the invention, before impact,
- la figure 2 représente, à échelle agrandie, en perspective, la zone repérée II à la figure 1, - la figure 3 représente la zone II, à échelle agrandie, en coupe sans la tête de la vis,FIG. 2 represents, on an enlarged scale, in perspective, the area marked II in FIG. 1; FIG. 3 represents zone II, on an enlarged scale, in section without the head of the screw;
- la figure 4 est une représentation conformément à la figure 3, au cours d'un choc basse vitesse,FIG. 4 is a representation according to FIG. 3, during a low speed shock,
- la figure 5 est une représentation conformément à la figure 3, après un choc basse vitesse,FIG. 5 is a representation according to FIG. 3, after a low speed shock,
- la figure 6 est une représentation conformément à la figure 3, après un choc haute vitesse.- Figure 6 is a representation according to Figure 3 after a high speed shock.
La figure 1 illustre un siège 10 de véhicule automobile comprenant essentiellement une structure d'assise 24, une vis de fixation 6 solidaire de la structure d'assise 24, un adaptateur 8, une structure de dossier 26, un dispositif d'articulation en rotation 30 et un ensemble d'absorption d'énergie 1. Le dispositif d'articulation en rotation 30 est interposé entre l'adaptateur 8 et la structure de dossier 26. Il permet de régler l'inclinaison de la structure de dossier 26 par rapport à la structure d'assise 24. Etant bien connu en soi, en particulier de type articulation à grains ou de type articulation continue, le dispositif d'articulation en rotation 30 ne sera pas détaillé davantage .FIG. 1 illustrates a seat 10 of a motor vehicle essentially comprising a structure seat 24, a fastening screw 6 integral with the seat structure 24, an adapter 8, a backrest structure 26, a rotary articulation device 30 and an energy absorbing assembly 1. The device 30 is interposed between the adapter 8 and the backrest structure 26. It adjusts the inclination of the backrest structure 26 relative to the seat structure 24. Being well known per se, in particular type of articulation grain or continuous joint type, the rotary articulation device 30 will not be detailed further.
L'ensemble d'absorption d'énergie 1 comprend un premier dispositif d'absorption d'énergie 2 et un deuxième dispositif d'absorption d'énergie 4 interposés entre la structure d'assise 24 et l'adaptateur 8. Il permet d'absorber l'énergie de l'occupant du siège 10 en cas de choc, en autorisant une rotation contrôlée de la structure de dossier 26 par rapport à la structure d'assise 24 par déformation.The energy absorbing assembly 1 comprises a first energy absorbing device 2 and a second energy absorbing device 4 interposed between the seat structure 24 and the adapter 8. absorbing the energy of the occupant of the seat 10 in the event of shock, allowing a controlled rotation of the backrest structure 26 relative to the seat structure 24 by deformation.
Dans le mode de réalisation illustré, le deuxième dispositif d'absorption d'énergie 4 est intégré à l'adaptateur 8. L'adaptateur 8 est maintenu sur la structure d'assise 24 au moyen d'un pivot 28 et de la vis de fixation 6 vissée dans la structure d'assise 24. L'adaptateur 8 est constitué par une plaque mise en forme d'épaisseur sensiblement constante, de préférence de l'ordre de 2 à 3 millimètres.In the illustrated embodiment, the second energy absorbing device 4 is integrated in the adapter 8. The adapter 8 is held on the seat structure 24 by means of a pivot 28 and the screw of fastening 6 screwed into the seat structure 24. The adapter 8 is constituted by a shaped plate of substantially constant thickness, preferably of the order of 2 to 3 millimeters.
Le deuxième dispositif d'absorption d'énergie 4 est situé dans une portion extrême de l'adaptateur éloignée du pivot 28. Tel qu'illustré plus précisément à la figure 3, il présente une succession de découpes 20a, 20b, 20c, dans l'exemple illustré trois découpes, se succédant suivant une direction de déformation X sensiblement rectiligne. La direction de déformation X s'étend sensiblement circonférentiellement par rapport au pivot 28, avec une légère déviation du fait d'une déformation d'ensemble prévue de 1 ' adaptateur 8.The second energy absorbing device 4 is located in an extreme portion of the adapter remote from the pivot 28. As shown more precisely in FIG. 3, it has a succession of cuts 20a, 20b, 20c, in the illustrated example three cuts, succeeding in a direction of deformation X substantially rectilinear. The direction of deformation X extends substantially circumferentially with respect to the pivot 28, with a slight deviation due to a planned overall deformation of the adapter 8.
Les découpes 20a, 20b, 20c définissent entre elles des pontets 22a, 22b, au nombre de deux dans le mode de réalisation illustré. Les pontets 22a, 22b s'étendent suivant une direction d'allongement Y et présentent suivant la direction de déformation X une largeur qui est sensiblement constante sur toute leur longueur, avec toutefois une restriction à leurs extrémités.The cutouts 20a, 20b, 20c define between them bridges 22a, 22b, two in number in the illustrated embodiment. The bridges 22a, 22b extend in an elongation direction Y and have in the direction of deformation X a width which is substantially constant over their entire length, with however a restriction at their ends.
Le premier dispositif d'absorption d'énergie 2 se présente sensiblement sous la forme d'une pièce monobloc présentant une symétrie par rapport à un plan médian perpendiculaire à la direction d'allongement Y. Il est disposé dans la découpe extrême 20a, dans laquelle il est maintenu dans la direction de déformation X entre la tige de la vis 6 et le pontet 20a, dans la direction d'allongement Y par les bords de la découpe 20a et perpendiculairement à la direction de déformation X et à la direction d'allongement Y entre la structure d'assise 24 et la tête de la vis 6, tel qu'illustré à la figure 2.The first energy absorbing device 2 is substantially in the form of a one-piece piece having a symmetry with respect to a median plane perpendicular to the elongation direction Y. It is disposed in the end cutout 20a, in which it is held in the deformation direction X between the screw shank 6 and the bridge 20a, in the elongation direction Y by the edges of the cutout 20a and perpendicular to the deformation direction X and to the elongation direction Y between the seat structure 24 and the head of the screw 6, as shown in Figure 2.
Le premier dispositif d'absorption d'énergie 2 a sensiblement une forme de disque présentant des découpes le traversant et définissant un logement recevant la vis 6 et une lumière 12 allongée s 'étendant en regard et à proximité du pontet 22a. La lumière 12 s'étend sensiblement suivant la direction d'allongement Y. Elle est entièrement incluse à l'intérieur du premier dispositif d'absorption d'énergie 2, de sorte qu'elle délimite une portion principale 14 et une portion de déformation 16 reliées l'une à l'autre par deux bandes de matière. La portion de déformation 16 présente une largeur sensiblement constante, de sorte que la lumière 12 est légèrement arquée.The first energy absorbing device 2 has substantially a disc shape having cutouts therethrough and defining a housing receiving the screw 6 and an elongate slot 12 extending opposite and in the vicinity of the bridge 22a. The lumen 12 extends substantially in the direction of elongation Y. It is entirely included inside the first energy absorbing device 2, so that it delimits a main portion 14 and a deformation portion 16 connected to each other by two strips of material. The deformation portion 16 has a substantially constant width, so that the light 12 is slightly arched.
En cas de choc arrière subi par le véhicule, l'occupant du siège 10 exerce une pression très élevée sur la structure de dossier 26 du siège, tendant à faire pivoter l'adaptateur 8 autour du pivot 28 et à déplacer le pontet 22a vers la tige de la vis de fixation 6 suivant la direction de déformation X. Le premier dispositif d'absorption d'énergie 2 et le deuxième dispositif d'absorption d'énergie 4 sont distincts l'un de l'autre et disposés en série, l'un derrière l'autre suivant la direction de déformation X. Tel qu'illustré à la figure 4, ils sont sollicités de manière étagée en cas de choc. Tant que la portion de déformation 16 du premier dispositif d'absorption d'énergie 2 est distante de la portion principale 14, le premier dispositif d'absorption d'énergie 2 présente une résistance a la déformation modérée, tandis que le deuxième dispositif d'absorption d'énergie 4 présente une résistance à la déformation relativement élevée. Ainsi, le premier dispositif d'absorption d'énergie 2 et le deuxième dispositif d'absorption d'énergie 4 contribuent alors à absorber l'énergie du choc. De plus, tant que la portion de déformation 16 du premier dispositif d'absorption d'énergie 2 est distante de la portion principale 14, la résistance à la déformation du premier dispositif d'absorption d'énergie 2 est suffisamment faible pour que le deuxième dispositif d'absorption d'énergie 4 se déforme élastiquement .In the event of a rear impact to the vehicle, the occupant of the seat 10 exerts a very high pressure on the backrest structure 26 of the seat, tending to pivot the adapter 8 around the pivot 28 and move the bridge 22a towards the rod of the fixing screw 6 in the direction of deformation X. The first absorption device of energy 2 and the second energy absorbing device 4 are distinct from one another and arranged in series, one behind the other in the direction of deformation X. As illustrated in FIG. they are solicited staged in case of shock. As long as the deformation portion 16 of the first energy absorbing device 2 is distant from the main portion 14, the first energy absorbing device 2 has a moderate resistance to deformation, while the second deformation device 16 energy absorption 4 has a relatively high resistance to deformation. Thus, the first energy absorbing device 2 and the second energy absorbing device 4 then contribute to absorbing the energy of the shock. In addition, as long as the deformation portion 16 of the first energy absorbing device 2 is distant from the main portion 14, the deformation resistance of the first energy absorbing device 2 is sufficiently low for the second energy absorbing device 4 is deformed elastically.
Par conséquent, tel qu'illustré à la figure 5, après un choc à basse vitesse, le premier dispositif d'absorption d'énergie 2 est déformé plastiquement, la lumière 12 restant écrasée de manière permanente, mais le deuxième dispositif d'absorption d'énergie 4 est intact, le pontet 22a ayant repris sa forme initiale par retour élastique. Ainsi, si l'on souhaite redonner au siège son niveau de sécurité initiai on retire le premier dispositif d'absorption d'énergie 2 usagé et on le remplace par un dispositif neuf dans la découpe 20a, on redonne donc au siège 1 son niveau de sécurité initial .Therefore, as shown in FIG. 5, after a low velocity shock, the first energy absorbing device 2 is plastically deformed, the light 12 remaining permanently crushed, but the second energy absorbing device 2 energy 4 is intact, the bridge 22a having resumed its initial shape by springback. Thus, if it is desired to restore the seat to its original safety level, the first used energy absorption device 2 is removed and replaced by a new device in the cut 20a, so we give the seat 1 its initial level of security.
Tel qu'illustré à la figure 6, en cas de choc à haute vitesse, lorsque la portion de déformation 16 vient en appui contre la portion principale 14 du premier dispositif d'absorption d'énergie 2, toute l'énergie du choc n'est pas absorbée, de sorte que l'ensemble d'absorption d'énergie 1 est toujours sollicité.As illustrated in FIG. 6, in the event of a high-speed impact, when the deformation portion 16 bears against the main portion 14 of the first energy-absorbing device 2, all the energy of the impact n ' is not absorbed, so that the energy absorbing assembly 1 is always solicited.
Le premier dispositif d'absorption d'énergie 2 ne se déforme alors sensiblement plus, de sorte que la résistance à la déformation de l'ensemble 1 est alors sensiblement celle du deuxième dispositif d'absorption d'énergie 4.The first energy absorbing device 2 then deforms substantially more, so that the resistance to deformation of the assembly 1 is then substantially that of the second energy absorbing device 4.
Le pontet 22a, puis éventuellement le pontet 22b selon l'importance du choc, est déformé plastiquement , éventuellement jusqu'à la rupture. The bridge 22a, then possibly the bridge 22b according to the importance of the shock, is deformed plastically, possibly until breaking.

Claims

REVENDICATIONS
1. Ensemble (1) d'absorption d'énergie par déformation en particulier pour siège (10) de véhicule automobile en cas de choc, ledit ensemble (1) comprenant un premier dispositif d'absorption d'énergie (2) et un deuxième dispositif d'absorption d'énergie (4) destinés à être interposés entre un premier élément (6) et un deuxième élément (8) afin de les maintenir l'un par rapport à l'autre en absorbant des contraintes élevées exercées entre lesdits premier élément (6) et deuxième élément (8), ledit premier dispositif d'absorption d'énergie (2) et ledit deuxième dispositif d'absorption (4) étant disposés en série et aptes à être sollicités de façon étagée suivant une direction de déformation (X) en cas de contrainte s ' exerçant sur l'ensemble (1) d'absorption d'énergie.1. An assembly (1) for energy absorption by deformation, in particular for a motor vehicle seat (10) in the event of an impact, said assembly (1) comprising a first energy absorbing device (2) and a second energy absorbing device (4) intended to be interposed between a first element (6) and a second element (8) in order to maintain them relative to one another by absorbing high stresses exerted between said first element (6) and second element (8), said first energy absorbing device (2) and said second absorption device (4) being arranged in series and able to be staggered in a deformation direction (X) in case of stress exerted on the assembly (1) of energy absorption.
2. Ensemble selon la revendication 1, dans lequel ledit premier dispositif d'absorption d'énergie (2) présente une résistance à la déformation inférieure à la résistance à la déformation du deuxième dispositif d'absorption d'énergie (4).2. The assembly of claim 1, wherein said first energy absorbing device (2) has a resistance to deformation less than the deformation resistance of the second energy absorbing device (4).
3. Ensemble selon la revendication 2, dans lequel le premier dispositif d'absorption d'énergie (2) présente une résistance à la déformation inférieure entre 1,5 fois et 3 fois la résistance à la déformation du deuxième dispositif d'absorption d'énergie (4),3. An assembly according to claim 2, wherein the first energy absorbing device (2) has a lower deformation resistance between 1.5 times and 3 times the deformation resistance of the second absorption device. energy (4),
4. Ensemble selon l'une quelconque des revendications précédentes, dans lequel le premier dispositif d'absorption d'énergie (2) comprend une pièce monobloc présentant une lumière (12) allongée séparant une première portion (14) et une deuxième portion (16) en regard, ladite lumière (12) s ' étendant transversalement à la direction de déformation (X) et présentant une largeur (1) sensiblement constante. An assembly according to any one of the preceding claims, wherein the first energy absorbing device (2) comprises a one-piece piece having an elongate lumen (12) separating a first portion (14) and a second portion (16). ) facing said light (12) extending transversely to the deformation direction (X) and having a substantially constant width (1).
5. Ensemble selon la revendication 4, dans lequel l'effort pour amener lesdites première portion (14) et deuxième portion (16) au contact l'une de l'autre par déformation est inférieur à l'effort nécessaire pour déformer plastiquement le deuxième dispositif d'absorption d' énergie (4) .5. The assembly of claim 4, wherein the force to bring said first portion (14) and second portion (16) in contact with each other by deformation is less than the effort required to plastically deform the second. energy absorbing device (4).
6. Ensemble selon l'une quelconque des revendications précédentes, dans lequel le deuxième dispositif d'absorption d'énergie (4) comprend une plaque présentant une succession de découpes (20a, 20b, 20c) se succédant suivant la direction de déformation (X) et définissant entre elles au moins un pontet (22a, 22b) s ' étendant suivant une direction d'allongement (Y) transversale à la direction de déformation (X) . 6. An assembly according to any one of the preceding claims, wherein the second energy absorbing device (4) comprises a plate having a succession of cuts (20a, 20b, 20c) succeeding one another in the direction of deformation (X ) and defining between them at least one bridge (22a, 22b) extending in an elongation direction (Y) transverse to the deformation direction (X).
7. Ensemble selon la revendication 6, dans lequel le premier dispositif d'absorption d'énergie (2) est disposé à l'intérieur de l'une des découpes (20a).7. The assembly of claim 6, wherein the first energy absorbing device (2) is disposed within one of the cutouts (20a).
8. Siège (10) comprenant un premier élément (6) et un deuxième élément (8) et un ensemble d'absorption (1) selon l'une quelconque des revendications précédentes interposé entre le premier élément (2) et le deuxième élément (4), dans lequel le premier dispositif d'absorption (2) est amovible. 8. Seat (10) comprising a first element (6) and a second element (8) and an absorption assembly (1) according to any one of the preceding claims interposed between the first element (2) and the second element ( 4), wherein the first absorption device (2) is removable.
PCT/FR2008/050956 2007-06-05 2008-05-30 Energy absorption assembly provided with two absorption devices WO2008149044A2 (en)

Priority Applications (1)

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DE112008001976.2T DE112008001976B4 (en) 2007-06-05 2008-05-30 Unit for absorbing energy with two absorption devices

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FR0704001 2007-06-05
FR0704001A FR2917025B1 (en) 2007-06-05 2007-06-05 ENERGY ABSORPTION ASSEMBLY WITH TWO ABSORPTION DEVICES

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WO2008149044A2 true WO2008149044A2 (en) 2008-12-11
WO2008149044A3 WO2008149044A3 (en) 2009-03-12

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FR (1) FR2917025B1 (en)
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US10315541B2 (en) 2014-09-02 2019-06-11 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Deformation element for a motor vehicle seat
US20190184866A1 (en) * 2017-12-15 2019-06-20 Honda Motor Co., Ltd. Seat device

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CN107921895B (en) * 2015-08-04 2020-04-03 提爱思科技股份有限公司 Seat frame for vehicle
FR3102418A1 (en) * 2019-10-25 2021-04-30 Renault S.A.S Motor vehicle seat frame and associated vehicle seat
DE202022105717U1 (en) 2022-10-11 2022-10-26 Faurecia Autositze Gmbh Vehicle seat adjuster rack and vehicle seat

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DE19944635A1 (en) * 1999-09-17 2001-03-22 Hammerstein Gmbh C Rob Vehicle seat with bolt connection between two parts, with plastically deformable weak point in at least one part region of bearing
US20040061364A1 (en) * 2002-09-30 2004-04-01 Lear Corporation Vehicle seat assembly with energy managing member
EP1547857A2 (en) * 2003-12-24 2005-06-29 Delta Kogyo Co., Ltd. Automobile seat

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DE19807581A1 (en) * 1997-03-07 1998-09-10 Saab Automobile Energy-absorbing device for vehicle seat
DE19944635A1 (en) * 1999-09-17 2001-03-22 Hammerstein Gmbh C Rob Vehicle seat with bolt connection between two parts, with plastically deformable weak point in at least one part region of bearing
US20040061364A1 (en) * 2002-09-30 2004-04-01 Lear Corporation Vehicle seat assembly with energy managing member
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US10315541B2 (en) 2014-09-02 2019-06-11 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Deformation element for a motor vehicle seat
US20190184866A1 (en) * 2017-12-15 2019-06-20 Honda Motor Co., Ltd. Seat device
US10821860B2 (en) * 2017-12-15 2020-11-03 Honda Motor Co., Ltd. Seat device

Also Published As

Publication number Publication date
FR2917025A1 (en) 2008-12-12
DE112008001976B4 (en) 2014-02-27
WO2008149044A3 (en) 2009-03-12
DE112008001976T5 (en) 2010-06-17
FR2917025B1 (en) 2010-02-12

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