WO2012076779A1 - Device for guiding the compression of a vehicle bed side rail - Google Patents

Device for guiding the compression of a vehicle bed side rail Download PDF

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Publication number
WO2012076779A1
WO2012076779A1 PCT/FR2011/052740 FR2011052740W WO2012076779A1 WO 2012076779 A1 WO2012076779 A1 WO 2012076779A1 FR 2011052740 W FR2011052740 W FR 2011052740W WO 2012076779 A1 WO2012076779 A1 WO 2012076779A1
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WO
WIPO (PCT)
Prior art keywords
spar
piston
vehicle
structure according
vehicle structure
Prior art date
Application number
PCT/FR2011/052740
Other languages
French (fr)
Inventor
Loïc GRALL
Richard Zeitouni
Original Assignee
Peugeot Citroen Automobiles Sa
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 Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Publication of WO2012076779A1 publication Critical patent/WO2012076779A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B62D21/152—Front or rear frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
    • 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
    • F16F7/125—Units with a telescopic-like action as one member moves into, or out of a second member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/36—Combinations of yieldable mounting means of different types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R2019/266—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means using friction sufaces

Definitions

  • the present invention relates to the structure of a motor vehicle. More specifically, it relates to the stretcher of the vehicle, the side members are deformed when the vehicle is subjected to a frontal impact.
  • these spars are generally chosen to impart significant inertia, and increase their transverse stiffness.
  • these spars with reinforced inertia generally have a larger mass, and occupy more space than the unreinforced spars. Reinforcement therefore increases the cost of production stretchers, an increase in the vehicle causing an increase in fuel consumption, and a larger size making it more difficult the implementation of the various components of the vehicle around the stretcher.
  • the present invention aims to overcome these disadvantages of the prior art.
  • the present invention aims to provide a vehicle stretcher, especially automobile, which allows a significant dissipation of energy during a frontal impact of the vehicle.
  • a particular object of the invention is to provide such a stretcher which has a relatively small weight and bulk in the vehicle and is inexpensive to manufacture.
  • a vehicle structure in particular an automobile structure, comprising a stretcher comprising two longitudinal members in the form of hollow sections and a transverse beam carried by the front ends of these longitudinal members, characterized in that the transverse beam is integral, at each of its ends, with a piston engaging in a guide tube fixed in the front part of the hollow profile of the corresponding spar and being able to slide forcibly in this guide tube, the width of the piston being less than the inner width of the hollow profile of the spar, so that the front portion of the spar can be deformed by longitudinal compression, during a frontal impact of the vehicle applied to the transverse beam , by creating folds of deformation, in particular towards interior, with the walls hollow profile, and contacting the piston to guide the longitudinal compression.
  • the piston has a rigidity greater than the rigidity of the spar, so as not to deform substantially during the deformation of the spar.
  • the width of the piston is between 60% and 90% of the inner width of the spar, to allow the formation of folds towards the inside of the walls of the spar, which can come into contact with the piston.
  • the guide tube is integral with a plate welded to the front end of the spar.
  • the guide tube is fixed by screwing to said patina.
  • each spar has a zone of weakness, in a plane perpendicular to its longitudinal direction, to promote the formation of folds during a frontal impact of the vehicle applied to the transverse beam.
  • the spar has a substantially square cross section.
  • the piston has a substantially cylindrical cross section.
  • the piston has a length greater than that of the guide tube.
  • the invention also relates to a motor vehicle incorporating a structure as described above.
  • FIG. 1 is a perspective view of the front of a spar of a stretcher of a motor vehicle, linked a transverse beam joining the front ends of the two longitudinal members;
  • FIGS. 2A to 2E are sectional views in a horizontal plane of the spar and the transverse beam of Figure 1, showing the successive steps of deformation of these elements during a frontal impact of the vehicle.
  • Figure 1 shows the front end of a left spar 1 of a stretcher of a vehicle.
  • This spar 1 which is constituted by a section, or hollow tube of substantially square section, terminates in a plate 11.
  • the front end of the spar 1 carries an end of a transverse beam 2, the second end is carried by the right spar (not shown) of the vehicle stretcher.
  • This transverse beam 2 is intended in particular to carry the front bumper of the vehicle.
  • FIG. 2A is a sectional view, in a horizontal plane, of the assembly represented in FIG. 1.
  • the transverse beam 2 carries a cylindrical piston 21 which is engaged in the front end. of the spar 1.
  • This piston 21 is force-fitted into a guide tube 12 passing through the plate 11, and integral with the latter.
  • the transverse beam 2 When the motor vehicle is subjected to a shock of the frontal type of low power, the transverse beam 2 is pushed back by the shock. The piston 21 then sinks by sliding in force in the guide tube 12, and penetrating into the spar 1, as shown in Figure 2B.
  • the piston 21 has a longer length than the guide tube 12.
  • the inside diameter of the guide tube 12 is slightly smaller than the outside diameter of the piston 21, the sliding of the piston 21 in the guide tube 12 absorbs a large amount of energy during the impact, without generating any deformation of the front stretcher. After such a shock, it is not necessary to repair the front stretcher, which has not been deformed. It suffices to replace the transverse beam 2 and the elements which are connected thereto, for example the bumper, as well as the pistons 21 and the guide tubes 12. To facilitate the replacement of this assembly, called the repair system, the tubes 12 are fixed to the plate 11 by means of a plate 121 welded to the guide tube 12 and screwed to the plate 11.
  • the piston 21 When the vehicle undergoes a greater frontal impact, the piston 21 reaches the end of its sliding in the guide tube 12 without having dissipated all of the energy of the shock. In this case, as shown in FIGS. 2C to 2E, the shock deforms the spar 1.
  • the spar 1 has, of construction, slight deformations constituting zones of weakening intended to favor the formation of folds for the correct priming of this crushing. These slight deformations are located in a plane perpendicular to the longitudinal direction of the spar, a few centimeters from the plate 11, and are constituted by outwardly facing bosses 101 on the upper and lower faces of the spar 1 and bosses towards the 102 on the side faces of the spar 1.
  • the upper and lower walls of the spar 1 deform in the opposite direction of the side walls, which are shown in Figures 2A to 2E.
  • an inward fold is formed on the sidewalls
  • an outward fold is formed on the top and bottom walls, and vice versa.
  • the upper and lower walls thus deform also by forming folds inwardly which can bear against the piston 21.
  • piston 21 can effectively guide the formation of the folds of the spar 1, it is important that the piston 21 and its guide tube 12 are stiffer than the spar 1, so as not to deform significantly during the shock and deformation of the spar.
  • the diameter of the piston is substantially less than the inner width of the spar 1, for example between 60% and 90% of this width, so as not to hinder the formation of the folds 31, 32 and 33 to inside the spar. Indeed, if the piston 21 does not leave enough room for the formation of these folds inwardly, the spar can be deformed in another mode less effective for the absorption of the impact energy. On the other hand, if the diameter of the piston is too much smaller than the inside diameter of the spar, it does not allow guiding effective. It is therefore necessary that the diameter of the piston is substantially equal to the inner width of the spar 1 minus the thickness of the folds forming in the desired deformation mode of the spar 1, for example between 60% and 90% of this width.
  • the present invention thus makes it possible to reinforce the transverse stiffness of the side members of the stretcher by forcing them to deform, during an impact, by compression along their longitudinal axis, without causing any increase in weight or complexity, in a vehicle also equipped with a repair system for absorbing the energy of low power shocks by easily replaceable parts.

Abstract

The invention relates to a vehicle structure including a bed that includes two side rails (1), in the form of hollow profile members, and a transverse beam (2) held by the ends in front of said side rails (1), wherein the transverse beam (2) is rigidly connected, on each of the ends thereof, to a piston (21) inserted in a guide tube (12) attached into the front portion of the corresponding side rail (1) and that is forcibly slidable into said guide tube (12). The width of the piston (21) is less than the inner width of the side rail (1) so that the front portion of the side rail (1) can change shape, by means of longitudinal compression, when a shock to the front of the vehicle is applied to the transverse beam (2), thus creating shape-changing folds, in particular inwardly, on the walls of the hollow profile element and making contact with the piston (21) so as to guide the longitudinal compression.

Description

"DISPOSITIF DE GUIDAGE DE LA COMPRESSION D ' UN LONGERON DE "DEVICE FOR GUIDING THE COMPRESSION OF A LONGERON OF
BRANCARD D ' UN VEHICULE " BRANCH OF A VEHICLE "
La présente invention concerne la structure d'un véhicule automobile. Plus précisément, elle concerne le brancard du véhicule, dont les longerons sont déformés quand le véhicule subit un choc frontal. The present invention relates to the structure of a motor vehicle. More specifically, it relates to the stretcher of the vehicle, the side members are deformed when the vehicle is subjected to a frontal impact.
Quand un véhicule automobile subit un choc frontal important, en effet, les partis d'extrémité avant des longerons de son brancard, qui s'étendent dans la direction longitudinale du véhicule, sont déformés. Il est préférable, pour dissiper une partie importante de l'énergie du choc, que cette déformation se fasse sous la forme d'une compression longitudinale, ou bottelage, des longerons, dans laquelle des plis successifs se forment dans des plans perpendiculaires à la direction longitudinale des longerons.  When a motor vehicle is subjected to a large frontal impact, in fact, the front end portions of the struts of his stretcher, which extend in the longitudinal direction of the vehicle, are deformed. It is preferable, in order to dissipate a large part of the impact energy, that this deformation takes the form of a longitudinal compression, or bundling, of the longitudinal members, in which successive folds are formed in planes perpendicular to the direction longitudinal longitudinal members.
Il est cependant courant que, lors du choc, un longeron se plie en s 'éloignant de son axe longitudinal, une pliure formant un axe de rotation vertical entre deux portions du longeron. La déformation, dans ce cas, absorbe une quantité d'énergie du choc beaucoup moins importante. La protection du reste du véhicule, et notamment de l'habitacle dans lequel sont les passagers, est alors diminuée.  It is however common that, during impact, a spar folds away from its longitudinal axis, a fold forming a vertical axis of rotation between two portions of the spar. The deformation, in this case, absorbs a much lower amount of energy from the shock. The protection of the rest of the vehicle, and in particular of the passenger compartment in which the passengers are, is then reduced.
Pour stabiliser le bottelage des longerons en cas de choc, la forme et la taille de ces longerons sont généralement choisies pour leur conférer une inertie importante, et augmenter leur raideur transversale. Cependant, ces longerons à inertie renforcée présentent généralement une masse plus importante, et occupent plus de place que les longerons non renforcés. Le renforcement engendre donc une augmentation du coût de production des brancards, un alourdissement du véhicule engendrant une augmentation de sa consommation en carburant, et une taille plus importante rendant plus difficile l'implantation des différents composants du véhicule autour du brancard. To stabilize the bunching of the spars in case of impact, the shape and size of these spars are generally chosen to impart significant inertia, and increase their transverse stiffness. However, these spars with reinforced inertia generally have a larger mass, and occupy more space than the unreinforced spars. Reinforcement therefore increases the cost of production stretchers, an increase in the vehicle causing an increase in fuel consumption, and a larger size making it more difficult the implementation of the various components of the vehicle around the stretcher.
Par ailleurs, quand les longerons ne sont pas assez rigides transversalement et risquent de se déformer par rotation autour d'une ligne de pliage, ces longerons ne sont pas suffisants pour dissiper l'énergie d'un choc frontal, ce qui rend nécessaire la consolidation de l'habitacle du véhicule. Le poids du véhicule, et donc sa consommation en carburant, est alors augmenté, ainsi que son coût de fabrication.  Furthermore, when the rails are not rigid enough transversely and may deform by rotation around a fold line, these beams are not sufficient to dissipate the energy of a frontal impact, which makes consolidation necessary. the passenger compartment of the vehicle. The weight of the vehicle, and therefore its fuel consumption, is then increased, as well as its manufacturing cost.
La présente invention a pour objectif de pallier ces inconvénients de l'art antérieur.  The present invention aims to overcome these disadvantages of the prior art.
En particulier, la présente invention a pour objectif de fournir un brancard de véhicule, notamment automobile, qui permette une dissipation importante de l'énergie lors d'un choc frontal du véhicule.  In particular, the present invention aims to provide a vehicle stretcher, especially automobile, which allows a significant dissipation of energy during a frontal impact of the vehicle.
Un objectif particulier de l'invention est de fournir un tel brancard qui présente un poids et un encombrement relativement peu importants dans le véhicule et qui soit peu coûteux à fabriquer.  A particular object of the invention is to provide such a stretcher which has a relatively small weight and bulk in the vehicle and is inexpensive to manufacture.
Ces objectifs, ainsi que d'autres qui apparaîtront plus clairement par la suite, sont atteints à l'aide d'une structure de véhicule, notamment automobile, comprenant un brancard comprenant deux longerons en forme de profilés creux et une poutre transversale portée par les extrémités avant de ces longerons, caractérisée en ce que la poutre transversale est solidaire, à chacune de ses extrémités, d'un piston s 'engageant dans un tube de guidage fixé dans la partie avant du profilé creux du longeron correspondant et pouvant coulisser à force dans ce tube de guidage, la largeur du piston étant inférieure à la largeur intérieure du profilé creux du longeron, de façon que la partie avant du longeron puisse se déformer par compression longitudinale, lors d'un choc frontal du véhicule appliqué à la poutre transversale, en créant des plis de déformation, notamment vers intérieur, aux parois du profilé creux, et entrant en contact avec le piston pour guider la compression longitudinale. These objectives, as well as others which will appear more clearly later, are achieved by means of a vehicle structure, in particular an automobile structure, comprising a stretcher comprising two longitudinal members in the form of hollow sections and a transverse beam carried by the front ends of these longitudinal members, characterized in that the transverse beam is integral, at each of its ends, with a piston engaging in a guide tube fixed in the front part of the hollow profile of the corresponding spar and being able to slide forcibly in this guide tube, the width of the piston being less than the inner width of the hollow profile of the spar, so that the front portion of the spar can be deformed by longitudinal compression, during a frontal impact of the vehicle applied to the transverse beam , by creating folds of deformation, in particular towards interior, with the walls hollow profile, and contacting the piston to guide the longitudinal compression.
Avantageusement, le piston présente une rigidité supérieure à la rigidité du longeron, de façon à ne pas se déformer sensiblement lors de la déformation du longeron .  Advantageously, the piston has a rigidity greater than the rigidity of the spar, so as not to deform substantially during the deformation of the spar.
Avantageusement, la largeur du piston est comprise entre 60% et 90% de la largeur intérieure du longeron, pour permettre la formation de plis vers l'intérieur des parois du longeron, qui puissent entrer en contact avec le piston.  Advantageously, the width of the piston is between 60% and 90% of the inner width of the spar, to allow the formation of folds towards the inside of the walls of the spar, which can come into contact with the piston.
Avantageusement, le tube de guidage est solidaire d'une platine soudée à l'extrémité avant du longeron.  Advantageously, the guide tube is integral with a plate welded to the front end of the spar.
Avantageusement, le tube de guidage est fixé par vissage à ladite patine.  Advantageously, the guide tube is fixed by screwing to said patina.
Avantageusement, chaque longeron présente une zone d'affaiblissement, dans un plan perpendiculaire à sa direction longitudinale, pour favoriser la formation de plis lors d'un choc frontal du véhicule appliqué à la poutre transversale.  Advantageously, each spar has a zone of weakness, in a plane perpendicular to its longitudinal direction, to promote the formation of folds during a frontal impact of the vehicle applied to the transverse beam.
Avantageusement, le longeron présente une section transversale sensiblement carrée.  Advantageously, the spar has a substantially square cross section.
Avantageusement, le piston présente une section transversale sensiblement cylindrique.  Advantageously, the piston has a substantially cylindrical cross section.
Avantageusement, le piston présente une longueur supérieure à celle du tube de guidage.  Advantageously, the piston has a length greater than that of the guide tube.
L'invention concerne également un véhicule automobile intégrant une structure telle que décrite ci- dessus .  The invention also relates to a motor vehicle incorporating a structure as described above.
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description qui suit d'un mode de réalisation illustratif et non limitatif, accompagné de dessins parmi lesquels :  Other characteristics and advantages of the invention will emerge more clearly on reading the following description of an illustrative and nonlimiting embodiment, accompanied by drawings among which:
- la figure 1 est une vue en perspective de l'avant d'un longeron d'un brancard d'un véhicule automobile, lié à une poutre transversale joignant les extrémités avant des deux longerons ; - Figure 1 is a perspective view of the front of a spar of a stretcher of a motor vehicle, linked a transverse beam joining the front ends of the two longitudinal members;
- les figures 2A à 2E sont des vues de coupe dans un plan horizontal du longeron et de la poutre transversale de la figure 1, montrant les étapes successives de déformation de ces éléments lors d'un choc frontal du véhicule.  - Figures 2A to 2E are sectional views in a horizontal plane of the spar and the transverse beam of Figure 1, showing the successive steps of deformation of these elements during a frontal impact of the vehicle.
La figure 1 représente l'extrémité avant d'un longeron gauche 1 d'un brancard d'un véhicule. Ce longeron 1, qui est constitué par un profilé, ou tube creux de section sensiblement carrée, se termine par une platine 11. L'extrémité avant du longeron 1 porte une extrémité d'une poutre transversale 2, dont la seconde extrémité est portée par le longeron droit (non représenté) du brancard du véhicule. Cette poutre transversale 2 est notamment destinée à porter le pare- choc avant du véhicule.  Figure 1 shows the front end of a left spar 1 of a stretcher of a vehicle. This spar 1, which is constituted by a section, or hollow tube of substantially square section, terminates in a plate 11. The front end of the spar 1 carries an end of a transverse beam 2, the second end is carried by the right spar (not shown) of the vehicle stretcher. This transverse beam 2 is intended in particular to carry the front bumper of the vehicle.
La figure 2A est une vue de coupe, selon un plan horizontal, de l'ensemble représenté à la figure 1. Comme le montrent les figures 1 et 2A, la poutre transversale 2 porte un piston 21 cylindrique qui est engagé dans l'extrémité avant du longeron 1. Ce piston 21 est emmanché à force dans un tube de guidage 12 traversant la platine 11, et solidaire de cette dernière.  FIG. 2A is a sectional view, in a horizontal plane, of the assembly represented in FIG. 1. As shown in FIGS. 1 and 2A, the transverse beam 2 carries a cylindrical piston 21 which is engaged in the front end. of the spar 1. This piston 21 is force-fitted into a guide tube 12 passing through the plate 11, and integral with the latter.
Lorsque le véhicule automobile subit un choc du type frontal de faible puissance, la poutre transversale 2 est repoussée par le choc vers l'arrière. Le piston 21 s'enfonce alors en coulissant à force dans le tube de guidage 12, et en pénétrant dans le longeron 1, comme le représente la figure 2B. Le piston 21 présente en effet une longueur plus importante que le tube de guidage 12.  When the motor vehicle is subjected to a shock of the frontal type of low power, the transverse beam 2 is pushed back by the shock. The piston 21 then sinks by sliding in force in the guide tube 12, and penetrating into the spar 1, as shown in Figure 2B. The piston 21 has a longer length than the guide tube 12.
Le diamètre intérieur du tube de guidage 12 étant légèrement inférieur au diamètre extérieur du piston 21, le coulissement du piston 21 dans le tube de guidage 12 absorbe une énergie importante lors du choc, sans générer de déformation du brancard avant. Après un tel choc, il n'est pas nécessaire de réparer le brancard avant, qui n'a pas été déformé. Il suffit de remplacer la poutre transversale 2 et les éléments qui y sont liés, par exemple le pare-choc, ainsi que les pistons 21 et les tubes de guidage 12. Pour faciliter le remplacement de cet ensemble, appelé système de réparabilité, les tubes de guidage 12 sont fixés à la platine 11 par l'intermédiaire d'une plaque 121 soudée au tube de guidage 12 et vissée à la platine 11. Since the inside diameter of the guide tube 12 is slightly smaller than the outside diameter of the piston 21, the sliding of the piston 21 in the guide tube 12 absorbs a large amount of energy during the impact, without generating any deformation of the front stretcher. After such a shock, it is not necessary to repair the front stretcher, which has not been deformed. It suffices to replace the transverse beam 2 and the elements which are connected thereto, for example the bumper, as well as the pistons 21 and the guide tubes 12. To facilitate the replacement of this assembly, called the repair system, the tubes 12 are fixed to the plate 11 by means of a plate 121 welded to the guide tube 12 and screwed to the plate 11.
Quand le véhicule subit un choc frontal plus important, le piston 21 arrive au bout de son coulissement dans le tube de guidage 12 sans avoir dissipé la totalité de l'énergie du choc. Dans ce cas, comme le représentent les figures 2C à 2E, le choc déforme le longeron 1.  When the vehicle undergoes a greater frontal impact, the piston 21 reaches the end of its sliding in the guide tube 12 without having dissipated all of the energy of the shock. In this case, as shown in FIGS. 2C to 2E, the shock deforms the spar 1.
Pour que la déformation du longeron 1 dissipe une plus grande quantité de l'énergie du choc, il est important que cette déformation se fasse par bottelage, ou compression dans la direction longitudinale du longeron 1.  In order for the deformation of the spar 1 to dissipate a greater amount of the impact energy, it is important that this deformation be done by bundling or compression in the longitudinal direction of the spar 1.
Comme le montre la figure 1, le longeron 1 présente, de construction, des légères déformations constituant des zones d'affaiblissement destinées à favoriser la formation de plis pour l'amorçage correct de cet écrasement. Ces légères déformations sont situées dans un plan perpendiculaire à la direction longitudinale du longeron, à quelques centimètres de la platine 11, et sont constituées par des bossages vers l'extérieur 101 sur les faces supérieure et inférieure du longeron 1 et des bossages vers l'intérieur 102 sur les faces latérales du longeron 1.  As shown in FIG. 1, the spar 1 has, of construction, slight deformations constituting zones of weakening intended to favor the formation of folds for the correct priming of this crushing. These slight deformations are located in a plane perpendicular to the longitudinal direction of the spar, a few centimeters from the plate 11, and are constituted by outwardly facing bosses 101 on the upper and lower faces of the spar 1 and bosses towards the 102 on the side faces of the spar 1.
Quand le longeron 1 est écrasé longitudinalement par un choc, des plis 31 vers l'intérieur se forment au niveau des bossages 102. Comme le montrent les figures 2C et 2D, ces plis 31 viennent en appui contre le piston 21. Cet appui permet de maintenir le longeron 1 droit, sans que son extrémité se plie en s 'écartant de son axe longitudinal . Quand l'écrasement se poursuit, plusieurs autres plis vers l'intérieur, notamment 32 et 33, se forment dans le longeron 1. Ces plis peuvent venir en appui contre la face latérale du piston 21, ce qui permet de maintenir l'alignement de ce piston 21, et donc de l'extrémité avant du longeron 1, avec l'axe longitudinal de ce longeron 1. When the spar 1 is crushed longitudinally by a shock, folds 31 inwards are formed at the bosses 102. As shown in Figures 2C and 2D, these folds 31 bear against the piston 21. This support allows to keep the spar 1 straight, without its end bending away from its longitudinal axis. When the crushing continues, several other inward folds, in particular 32 and 33, are formed in the spar 1. These folds can bear against the lateral face of the piston 21, which makes it possible to maintain the alignment of this piston 21, and therefore the front end of the spar 1, with the longitudinal axis of the spar 1.
Ainsi, à la fin de la déformation du longeron 1, comme le représente la figure 2E, ce longeron 1 est écrasé longitudinalement , ce qui a permis d'absorber une grande partie de l'énergie du choc.  Thus, at the end of the deformation of the spar 1, as shown in Figure 2E, the spar 1 is crushed longitudinally, which has absorbed much of the impact energy.
Il est à noter que les parois supérieure et inférieure du longeron 1 se déforment en sens inverse des parois latérales, qui sont représentées sur les figures 2A à 2E. Ainsi, quand un pli vers l'intérieur se forme sur les parois latérales, un pli vers l'extérieur se forme sur les parois supérieure et inférieure, et réciproquement. Les parois supérieure et inférieure se déforment donc également en formant des plis vers l'intérieur qui peuvent prendre appui contre le piston 21.  It should be noted that the upper and lower walls of the spar 1 deform in the opposite direction of the side walls, which are shown in Figures 2A to 2E. Thus, when an inward fold is formed on the sidewalls, an outward fold is formed on the top and bottom walls, and vice versa. The upper and lower walls thus deform also by forming folds inwardly which can bear against the piston 21.
Pour que le piston 21 puisse guider efficacement la formation des plis du longeron 1, il est important que ce piston 21 et son tube de guidage 12 soient plus rigides que le longeron 1, afin de ne pas se déformer de façon sensible lors du choc et de la déformation du longeron.  So that the piston 21 can effectively guide the formation of the folds of the spar 1, it is important that the piston 21 and its guide tube 12 are stiffer than the spar 1, so as not to deform significantly during the shock and deformation of the spar.
Par ailleurs, il est nécessaire que le diamètre du piston soit sensiblement inférieur à la largeur intérieure du longeron 1, valant par exemple entre 60% et 90% de cette largeur, pour ne pas gêner la formation des plis 31, 32 et 33 vers l'intérieur du longeron. En effet, si le piston 21 ne laisse pas suffisamment de place pour la formation de ces plis vers l'intérieur, le longeron peut se déformer selon un autre mode moins efficace pour l'absorption de l'énergie du choc. En revanche, si le diamètre du piston est trop inférieur au diamètre intérieur du longeron, il ne permet pas un guidage efficace. Il est donc nécessaire que le diamètre du piston soit sensiblement égal à la largeur intérieure du longeron 1 moins l'épaisseur des plis se formant dans le mode de déformation souhaité du longeron 1, soit par exemple entre 60% et 90% de cette largeur. Furthermore, it is necessary that the diameter of the piston is substantially less than the inner width of the spar 1, for example between 60% and 90% of this width, so as not to hinder the formation of the folds 31, 32 and 33 to inside the spar. Indeed, if the piston 21 does not leave enough room for the formation of these folds inwardly, the spar can be deformed in another mode less effective for the absorption of the impact energy. On the other hand, if the diameter of the piston is too much smaller than the inside diameter of the spar, it does not allow guiding effective. It is therefore necessary that the diameter of the piston is substantially equal to the inner width of the spar 1 minus the thickness of the folds forming in the desired deformation mode of the spar 1, for example between 60% and 90% of this width.
La présente invention permet donc de renforcer la raideur transversale des longerons du brancard, en forçant ceux-ci à se déformer, lors d'un choc, par une compression selon leur axe longitudinal, sans engendrer d'augmentation de poids ou de complexité, dans un véhicule équipé par ailleurs d'un système de réparabilité permettant l'absorption de l'énergie des chocs de faible puissance par des pièces facilement remplaçables.  The present invention thus makes it possible to reinforce the transverse stiffness of the side members of the stretcher by forcing them to deform, during an impact, by compression along their longitudinal axis, without causing any increase in weight or complexity, in a vehicle also equipped with a repair system for absorbing the energy of low power shocks by easily replaceable parts.

Claims

R E V E N D I C A T I O N S
1. Structure de véhicule, notamment automobile, comprenant un brancard comprenant deux longerons (1) en forme de profilés creux et une poutre transversale (2) portée par les extrémités avant de ces longerons (1), A vehicle structure, in particular an automobile, comprising a stretcher comprising two longitudinal members (1) in the form of hollow sections and a transverse beam (2) carried by the front ends of these longitudinal members (1),
caractérisée en ce que la poutre transversale est solidaire, à chacune de ses extrémités, d'un piston (21) s 'engageant dans un tube de guidage (12) fixé dans la partie avant du profilé creux du longeron (1) correspondant et pouvant coulisser à force dans ce tube de guidage (12), la largeur du piston (21) étant inférieure à la largeur intérieure du profilé creux du longeron (1), de façon que la partie avant du longeron (1) puisse se déformer par compression longitudinale, lors d'un choc frontal du véhicule appliqué à la poutre transversale (2), en créant des plis de déformation, notamment vers intérieur, aux parois du profilé creux, et entrant en contact avec le piston (21) pour guider la compression longitudinale.  characterized in that the transverse beam is integral at each of its ends with a piston (21) engaging in a guide tube (12) fixed in the front part of the hollow section of the corresponding spar (1) and capable of forcibly sliding in this guide tube (12), the width of the piston (21) being smaller than the internal width of the hollow profile of the spar (1), so that the front part of the spar (1) can deform by compression longitudinal, during a frontal impact of the vehicle applied to the transverse beam (2), creating deformation folds, especially inward, to the walls of the hollow profile, and coming into contact with the piston (21) to guide the compression longitudinal.
2. Structure de véhicule selon la revendication 1, caractérisée en ce que le piston (21) présente une rigidité supérieure à la rigidité du longeron (1), de façon à ne pas se déformer sensiblement lors de la déformation du longeron (1) .  2. Vehicle structure according to claim 1, characterized in that the piston (21) has a rigidity greater than the rigidity of the spar (1), so as not to deform substantially during the deformation of the spar (1).
3. Structure de véhicule selon l'une quelconque des revendications 1 et 2, caractérisée en ce que la largeur du piston (21) est comprise entre 60% et 90% de la largeur intérieure du longeron (1), pour permettre la formation de plis vers l'intérieur des parois du longeron (1), qui puissent entrer en contact avec le piston (21).  Vehicle structure according to any one of claims 1 and 2, characterized in that the width of the piston (21) is between 60% and 90% of the inner width of the spar (1), to allow the formation of folds inward of the walls of the spar (1), which can come into contact with the piston (21).
4. Structure de véhicule selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le tube de guidage (12) est solidaire d'une platine (11) soudée à l'extrémité avant du longeron (1) . 4. Vehicle structure according to any one of claims 1 to 3, characterized in that the guide tube (12) is integral with a plate (11) welded to the front end of the spar (1).
5. Structure de véhicule selon la revendication 4, caractérisée en ce que le tube de guidage (12) est fixé par vissage à ladite patine (11) . 5. Vehicle structure according to claim 4, characterized in that the guide tube (12) is screwed to said patina (11).
6. Structure de véhicule selon l'une quelconque des revendications 1 à 5, caractérisé en ce que chaque longeron (1) présente une zone d'affaiblissement (101, 102), dans un plan perpendiculaire à sa direction longitudinale, pour favoriser la formation de plis lors d'un choc frontal du véhicule appliqué à la poutre transversale (2) .  6. Vehicle structure according to any one of claims 1 to 5, characterized in that each spar (1) has a weakened zone (101, 102), in a plane perpendicular to its longitudinal direction, to promote formation folds during a frontal impact of the vehicle applied to the transverse beam (2).
7. Structure de véhicule selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le longeron (1) présente une section transversale sensiblement carrée .  7. Vehicle structure according to any one of claims 1 to 6, characterized in that the spar (1) has a substantially square cross section.
8. Structure de véhicule selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le piston (21) présente une section transversale sensiblement cylindrique .  8. Vehicle structure according to any one of claims 1 to 7, characterized in that the piston (21) has a substantially cylindrical cross section.
9. Structure de véhicule selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le piston Vehicle structure according to one of Claims 1 to 8, characterized in that the piston
(21) présente une longueur supérieure à celle du tube de guidage ( 12 ) . (21) has a length greater than that of the guide tube (12).
10. Véhicule automobile caractérisé en ce qu'il intègre une structure selon l'une quelconque des revendications 1 à 9.  10. Motor vehicle characterized in that it incorporates a structure according to any one of claims 1 to 9.
PCT/FR2011/052740 2010-12-10 2011-11-23 Device for guiding the compression of a vehicle bed side rail WO2012076779A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1060352A FR2968629B1 (en) 2010-12-10 2010-12-10 DEVICE FOR GUIDING THE COMPRESSION OF A STRETCH LONGERON OF A VEHICLE.
FR1060352 2010-12-10

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WO2012076779A1 true WO2012076779A1 (en) 2012-06-14

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PCT/FR2011/052740 WO2012076779A1 (en) 2010-12-10 2011-11-23 Device for guiding the compression of a vehicle bed side rail

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FR (1) FR2968629B1 (en)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508633A (en) * 1967-05-17 1970-04-28 Nissan Motor Plastically deformable impact absorbing means for vehicles
US4410208A (en) * 1981-11-02 1983-10-18 Chrysler Corporation Vehicle impact energy absorbing bumper mount
DE19616944A1 (en) * 1996-04-27 1997-10-30 Suspa Compart Ag Impact absorber
DE102005026284B3 (en) * 2005-06-08 2006-11-09 Dr.Ing.H.C. F. Porsche Ag Longitudinal carrier, for a motor vehicle chassis, has a two-part tube with a nominal fracture point between them to give a telescopic movement to absorb impact forces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508633A (en) * 1967-05-17 1970-04-28 Nissan Motor Plastically deformable impact absorbing means for vehicles
US4410208A (en) * 1981-11-02 1983-10-18 Chrysler Corporation Vehicle impact energy absorbing bumper mount
DE19616944A1 (en) * 1996-04-27 1997-10-30 Suspa Compart Ag Impact absorber
DE102005026284B3 (en) * 2005-06-08 2006-11-09 Dr.Ing.H.C. F. Porsche Ag Longitudinal carrier, for a motor vehicle chassis, has a two-part tube with a nominal fracture point between them to give a telescopic movement to absorb impact forces

Also Published As

Publication number Publication date
FR2968629B1 (en) 2012-12-21
FR2968629A1 (en) 2012-06-15

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