EP3844050A1 - Vehicle comprising a small-overlap frontal-impact absorption device - Google Patents

Vehicle comprising a small-overlap frontal-impact absorption device

Info

Publication number
EP3844050A1
EP3844050A1 EP18773794.5A EP18773794A EP3844050A1 EP 3844050 A1 EP3844050 A1 EP 3844050A1 EP 18773794 A EP18773794 A EP 18773794A EP 3844050 A1 EP3844050 A1 EP 3844050A1
Authority
EP
European Patent Office
Prior art keywords
vehicle
profiles
absorption device
extensions
screen
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP18773794.5A
Other languages
German (de)
French (fr)
Inventor
Richard Zeitouni
Marc Peru
Frédéric COIFFIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stellantis Auto SAS
Original Assignee
PSA 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 PSA Automobiles SA filed Critical PSA Automobiles SA
Publication of EP3844050A1 publication Critical patent/EP3844050A1/en
Pending legal-status Critical Current

Links

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
    • B62D21/155—Sub-frames or underguards
    • 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
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/02—Streamlining the undersurfaces

Definitions

  • the invention is in the field of vehicle frontal impact absorption devices and more particularly in the field of low-overlap frontal impact absorption devices.
  • the invention further relates to a vehicle provided with such an absorption device.
  • the front portion of a vehicle usually comprises two structural members, also called front stretchers, extending in the longitudinal direction of the vehicle on either side of the engine.
  • front stretchers In front of these stretchers is fixed a bumper beam via absorbers (or "crash boxes") configured to be compressed in the event of a frontal impact of the vehicle so as to absorb the forces.
  • absorbers or "crash boxes”
  • stretchers will be deformed in turn to participate in the absorption of these efforts.
  • a frontal impact test that involves projecting a vehicle against a deformable barrier at a speed of 64 km / h. During this test, the forces are distributed over approximately half a width of the vehicle (40%). However, such a test does not represent all cases of frontal impact, including some more severe that are directed against a non-deformable obstacle, such as a pole, located only on one side of the vehicle.
  • a new low-impact frontal impact test has therefore been established and consists in projecting the vehicle against a non-deformable barrier at a speed of 64 km / h and covering only 25% of the width of the vehicle. During such an impact, the front stretcher disposed on the side of the barrier will be compressed and folded on the inside of the vehicle.
  • each stretcher has a reinforcement in its curved portion conforming to the raised portion of the floor. This reinforcement may be straight or have a curvature inverse to the curvature of said portion. During a frontal impact, the reinforcements allow to reduce the bending of the stretchers at this portion so that it remains in position and absorbs the forces.
  • the document FR3001932 describes a front part of the body of a vehicle, configured for a low overlap frontal impact.
  • said front part comprises on each side, between the front bumper and the front wheel, a reinforcement wedge attached near the front of one of the two front stretchers.
  • the shim will be against the front wheel and prevent the rotation of the latter, so that it remains in line and comes stably load the sill spar behind. This has the effect of limiting the penetration of the barrier in the vehicle.
  • the invention aims to meet at least one of the problems encountered by the prior art by providing a new vehicle configured to improve the strength of the front stretchers to oblique forces during a frontal impact of the vehicle.
  • the subject of the invention is a motor vehicle comprising two stretchers and a cradle from which extend forward two extensions separated by an air gap, each extension extending below one of the struts and being connected to said stretcher by a support member, the vehicle being remarkable in that it further comprises an absorption device disposed in said air gap and between said extensions.
  • the invention proposes to arrange an absorption device between the two cradle extensions, so that oblique forces received by said extensions are absorbed.
  • the invention advantageously makes it possible indirectly to reinforce the resistance of the stretchers to the oblique forces by reinforcing the extensions extending below and connected to said stretcher by supporting elements. It is therefore the whole stretcher, support element and extends which is thus reinforced and which will oppose the entry of a pole so as to protect the occupants of the vehicle.
  • the absorption device thus provides a rigidity to stretchers which also allows to deflect the vehicle from the obstacle at the beginning of shock and thus to unload the rear structure of the vehicle end shock.
  • the absorption device comprises at least one transverse profile extending from one extension to the other, preferably until being in contact with them.
  • the oblique forces applied against one of the two prolongs are distributed on the other prolongs.
  • the other extends does not undergo stress and will serve as a stable support for the profiles.
  • the or at least one of the transverse profiles is disposed non-perpendicularly to the longitudinal axis of the vehicle, and / or the or at least one of the transverse profiles is disposed perpendicular to the longitudinal axis of the vehicle.
  • the or at least one of the transverse sections is disposed non-perpendicularly with respect to the longitudinal axis of the vehicle.
  • the extensions comprise a front end and the or at least one of the transverse sections disposed non-perpendicularly comprises an end disposed at the front end of one of the extensions.
  • the or at least one of the transverse sections is disposed perpendicularly to the longitudinal axis of the vehicle.
  • the extensions comprise a front end and the or at least one of the transverse profiles disposed perpendicularly comprises two ends each disposed at the front end of one of the extensions.
  • the support members being connected by a front cross member
  • the absorption device comprises a transverse profile disposed perpendicularly which is in contact with said front cross member. More preferably, said transverse section is fixed to said front cross member.
  • the absorption device further comprises at least one profile disposed parallel to the longitudinal axis of the vehicle.
  • Such longitudinal profiles can prevent elements located in front of the air gap separating extensions to enter the vehicle, especially during frontal shocks wider coverage.
  • the absorption device further comprises a profile extending from one extension to the other and disposed perpendicularly to the longitudinal axis of the vehicle against the cradle and being in contact with the longitudinal profile or profiles. This configuration advantageously makes it possible to reinforce the supports of the profile or profiles longitudinal. More preferably, the at least one of the longitudinal sections extends along one of the extensions.
  • the absorption device comprises at least two transverse profiles and at least one intermediate profile extending from one transverse profile to the other.
  • said intermediate section is disposed parallel to the longitudinal axis of the vehicle.
  • the absorption device further comprises at least one intermediate profile extending between a profile and a prolongation.
  • the absorption device further comprises at least one intermediate profile extending between a profile and an extension or between two profiles.
  • the presence of intermediate profiles increases the stiffness of the absorption device and therefore its ability to absorb the forces.
  • the or at least one of the profiles is attached to the extensions, preferably via fastening tabs. More preferably, the attachment is made by screwing, in particular using at least one self-tapping screw.
  • the use of self-tapping screws facilitates the mounting of the profiles because they do not require drilling and tapping prior to the extensions.
  • the fixing is performed by welding.
  • the or at least one of the profiles is formed of metal or a composite material.
  • the or at least one of the profiles is made of steel or aluminum.
  • the or at least one of the profiles is made of a thermoplastic material.
  • the device further comprises an underbody screen and the or at least one of the profiles is mounted on said screen or is integral with said screen.
  • the device of the invention thus has a dual function of absorbing oblique forces and improving the aerodynamics of the vehicle.
  • the presence of such a screen makes it possible to reduce the formation of turbulence of air below the engine during the running of the vehicle.
  • the presence of such a screen increases the stiffness of the device and therefore its ability to absorb the forces.
  • the underbody screen covers at least 30% of the dimensions of the air gap separating the two extensions, more preferably at least 50%, preferably at least at least 70%, more preferably at least 90%. According to a preferred embodiment, the underbody screen covers at least the dimensions of the air gap separating the two extensions.
  • the underbody screen comprises at least one side edge along one of the extensions and against which rests the or at least one of the profiles.
  • the underbody screen is attached to at least one extension and / or at least one mounting plate.
  • the attachment is made by screwing, in particular using at least one self-tapping screw.
  • the attachment by self-tapping screws facilitates the mounting of the absorption device on the vehicle.
  • the fixing is performed by welding.
  • the underbody screen is formed of a thermoplastic material or a composite material.
  • the screen acts as a damper before the biasing of the profiles.
  • the absorption of forces by the device is improved.
  • such a screen provides an acoustic insulation of the passenger compartment when objects, such as chippings, back towards the engine environment when driving the vehicle.
  • a plastic screen can absorb the sound vibrations produced by a shock.
  • the screen comprises a network of ribs.
  • a network of ribs makes it possible to increase the stiffness of the screen and therefore the stiffness of the absorption device.
  • the rib network comprises a set of ribs in the form of honeycombs.
  • the invention also relates to an absorption device for a vehicle as defined above, remarkable in that it comprises an underbody screen and at least one transverse profile extending from one edge to the other of said underbody screen so that the or at least one of the transverse profiles is disposed non-perpendicular to the longitudinal axis of the vehicle, and / or the or at least one of the transverse profiles is disposed perpendicularly to the longitudinal axis of the vehicle .
  • FIG. 1 shows a bottom view of a front portion of a vehicle according to the invention comprising an embodiment of an absorption device according to the invention.
  • FIG. 2 shows a side view of a front portion of a vehicle according to the invention comprising another embodiment of an absorption device according to the invention.
  • FIG. 3 shows a separate view of a front portion of a vehicle and an underbody screen according to the invention.
  • understand is synonymous with “include” and is not limiting in that it allows the presence of other elements in the vehicle or the absorption device to which it relates. It is understood that the term “understand” includes the words “consist of”.
  • front and “rear” as well as the “longitudinal” and “transverse” directions will be understood in relation to the general orientation of the vehicle.
  • the terms “low” and “lower” will indicate a greater proximity to the ground than the terms “high” and “higher” respectively.
  • the same references designate identical or similar elements.
  • FIG. 1 shows a bottom view of a front portion of a vehicle 1 according to the invention.
  • This front portion is composed of two front stretchers extending in the longitudinal direction of the vehicle 1 and on both sides of a motor (not shown).
  • a bumper beam 5 In front of these shafts 3 are absorbers on which is mounted a bumper beam 5.
  • This bumper beam carries a bumper skin (not shown) which forms part of the front of the vehicle 1.
  • Support elements 7, also called facade supports, are attached to the front ends of the shafts and support the front facade block (not shown) extending between the two support elements 7.
  • This front panel block comprises a heat exchanger, such as an engine cooling circuit radiator or charge air cooling circuit, or a passenger compartment air conditioning circuit capacitor.
  • the vehicle further comprises a cradle 9 from which extend forward two extensions 1 1 fixed by their front ends to the support elements 7.
  • the support elements 7 are connected in their lower part by a front cross member which is arranged in before said extensions 1 1 and under the heat exchanger.
  • the extensions 1 1 are separated by an air gap and are arranged below each of one of the two stretchers 3.
  • the front ends of the extensions 1 1 are also fixed to fixing plates on which are mounted absorbers. These absorbers carry a second bumper beam or lower bumper beam.
  • the vehicle 1 is remarkable in that it further comprises an absorption device 13 disposed in the air gap separating the two extensions 1 1 and in contact with said extensions 1 1.
  • the device of the invention makes it possible to absorb the oblique forces experienced by one of the two extensions 1 1 during a frontal collision with little overlap.
  • the stiffness of said extension 1 1 is thus improved, which makes it possible to limit or even prevent the stretcher 3 disposed above from being folded towards the inside of the vehicle 1.
  • This effect is obtained thanks to the mutual attachment of the stretcher 3 and the crossbar to the same support element 7.
  • the implementation of the device of the invention does not require modification of the vehicle 1, and can therefore be easily integrated into vehicles during their assembly.
  • the absorption device 13 comprises at least one transverse profile (15, 17) connecting the two extensions 1 1.
  • the absorption device 13 comprises at least one transverse profile 15 arranged non-perpendicularly with respect to the longitudinal axis of the vehicle 1.
  • the front end of the profile or at least one of the transverse sections 15 arranged in a non-perpendicular manner is disposed at the front end of the extension 1 1.
  • the absorption device 13 comprises at least one transverse section 17 disposed perpendicularly to the longitudinal axis of the vehicle 1.
  • the ends of the or one of the transverse profiles 17 disposed perpendicularly are arranged at the front ends of the extensions 1 1.
  • this transverse section 17 can be in contact with the front cross member connecting the two support elements 7, increasing the stiffness of this profile and therefore the stiffness of the device.
  • said transverse section 17 is fixed to said front cross member.
  • the transverse sections (15, 17) are distributed over the entire length of the extensions 1 1 so as to improve the distribution of forces.
  • the absorption device 13 further comprises at least one longitudinal profile 19 disposed parallel to the longitudinal axis of the vehicle 1.
  • the absorption device 13 of the invention makes it possible to limit or even prevent movement of the front wall block during a front impact and participates in absorbing the forces during a larger frontal impact. recoveries.
  • the absorption device 13 comprises a perpendicular transverse profile 17 arranged in a manner in contact with the cradle 9 and against which the longitudinal profile or profiles 19 rest.
  • the at least one of the longitudinal sections runs along one of the extensions. More preferably, said profile is in contact with said extension.
  • the absorption device 13 furthermore comprises at least one intermediate profile 21 connecting a continuation 1 1 and a profile (transverse or longitudinal ), or two profiles (transverse or longitudinal). These intermediate profiles 21 reinforce the stiffness of the device 3. Preferably, all the profiles (15, 17, 19, 21) form a lattice.
  • the different profiles are preferably fixed to the extensions 1 1 when they are in contact.
  • This fixing can be done by any means and in particular by means of at least one bracket.
  • Fixing can be performed by welding or screwing including using at least one self-tapping screw.
  • Self-tapping screws are advantageous over normal screws in that they do not require drilling before the place where they are fixed and thus their use facilitates the mounting of the device. They also allow faster fastening than by welding.
  • the various sections may have a cross section of any shape, including rectangular, circular, triangular, preferably rectangular or circular.
  • the device of the invention further comprises an underbody screen 23 and the or at least one of the profiles is mounted or made of material with said screen 23.
  • a screen 23 provides on the one hand an additional rigidity to the device, and on the other hand an aerodynamic function by limiting the formation of turbulence below the engine.
  • the device of the invention then has a dual function.
  • the screen can be mounted on a front part of an already existing vehicle without requiring modifications of said vehicle.
  • the invention is therefore easily adaptable to any type of vehicle.
  • the absorption device according to the invention can be mounted or not on a series of vehicles without major modifications of the production line.
  • the presence of such a device also makes it possible to reduce the thickness of the walls of the profile or profiles.
  • the profiles when the profiles are metal these may have a thickness of between 1.0 and 2.0 mm, preferably between 1.3 and 1.8 mm.
  • their thickness can be between 3.0 and 5.0 mm, preferably between 3.5 and 4.5 mm.
  • the underbody screen 23 covers at least 30% of the dimensions of the air gap separating the two extensions 1 1, more preferably at least 50%, preferably at least 70%, more preferably at least 90%. According to a preferred embodiment, the underbody screen 23 covers at least the dimensions of the air gap separating the two extensions 1 1.
  • the screen 23 comprises at least one side edge along one of the two extensions 1 1 and against which the or at least one of the profiles.
  • a profile integral with the screen 23 may extend from said side edge.
  • said lateral edge is in contact with said extension 1 1.
  • the screen 23 may be attached to the extensions 1 1 and / or to the fixing plates. This attachment can be done by any means and in particular by welding or screwing using for example at least one self-tapping screw.
  • the screen 23 and the various profiles (15, 17, 19, 21) may be formed of plastic material or composite material, preferably of composite material.
  • the composite material selected may be a thermoplastic or thermosetting composite material.
  • Composite materials are defined within the scope of the invention as having a matrix polymer and one or more reinforcing elements.
  • the reinforcing elements comprise or consist of fibers or a mixture of fibers selected from glass, carbon, ceramic, graphite, natural fibers such as flax, hemp or bamboo fibers, organic polymers such as than polyester fibers.
  • the fibers of the reinforcing elements are glass fibers.
  • thermoplastic polymer matrix will advantageously be selected from one or more materials selected from polypropylenes (PP), polyphthalamides (PPA), polyetheretherketones (PEEK), phenylene polysulfides (PPS), polyamide imides (PAI), polyetherimides (PEI), polyarylamides (PAA), or polyamides (PA) such as for example polyamide 6 (PA 6 or polycaprolactam) or polyamide 6.6 (PA 6.6 or polyhexamethylene adipamide).
  • PP polypropylenes
  • PPA polyphthalamides
  • PEEK polyetheretherketones
  • PPS phenylene polysulfides
  • PAI polyamide imides
  • PEI polyetherimides
  • PAA polyarylamides
  • PA polyamides
  • thermosetting polymer matrix will advantageously be selected from unsaturated polyesters, polyurethanes, vinylesters or polyepoxides.
  • the different sections (15, 17, 19, 21) can be formed of metal such as steel or aluminum, preferably aluminum.
  • the screen 23 comprises at least one edge along one of the two extensions 1 1 and the or at least one of the profiles is in contact with this edge, the use of a thermoplastic material or a composite material allows said edge to act as a shock absorber during a frontal impact before the solicitation of the profiles.
  • the absorption device 13 is more efficient in its absorption of energy.
  • the underbody screen comprises a network of ribs.
  • a network of ribs makes it possible to increase the stiffness of the screen and therefore the stiffness of the absorption device.
  • the rib network comprises a set of ribs in the form of honeycombs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Abstract

The invention relates to a motor vehicle (1) comprising two longitudinal members (3) and a cradle (9) from where there extend at the front two extensions (11) separated by a gap, each extension (11) extending below one of the longitudinal members (3) and being connected to said longitudinal member (3) by a support element (7), the vehicle (1) being characterized in that it additionally comprises an absorption device (13) arranged in said gap and between said extensions (11).

Description

VEHICULE COMPRENANT UN DISPOSITIF D'ABSORPTION POUR CHOC FRONTAL A  VEHICLE COMPRISING A FRONT IMPACT ABSORPTION DEVICE A
FAIBLE RECOUVREMENT L'invention se situe dans le domaine des dispositifs d'absorption de choc frontal de véhicule et plus particulièrement dans le domaine des dispositifs d'absorption de choc frontal à faible recouvrement. L'invention concerne en outre un véhicule pourvu d'un tel dispositif d'absorption.  The invention is in the field of vehicle frontal impact absorption devices and more particularly in the field of low-overlap frontal impact absorption devices. The invention further relates to a vehicle provided with such an absorption device.
La partie avant d'un véhicule comprend habituellement deux éléments de structure, aussi appelés brancards avant, s'étendant selon la direction longitudinale du véhicule de part et d'autre du moteur. En avant de ces brancards est fixée une poutre de pare-chocs par l'intermédiaire d'absorbeurs (ou « crash-boxes ») configurés pour être comprimés en cas de choc frontal du véhicule de manière à absorber les efforts. Lors d'un choc violent, les brancards vont être amenés à se déformer à leur tour pour participer à l'absorption de ces efforts. The front portion of a vehicle usually comprises two structural members, also called front stretchers, extending in the longitudinal direction of the vehicle on either side of the engine. In front of these stretchers is fixed a bumper beam via absorbers (or "crash boxes") configured to be compressed in the event of a frontal impact of the vehicle so as to absorb the forces. During a violent shock, stretchers will be deformed in turn to participate in the absorption of these efforts.
De nos jours, l'homologation des véhicules automobiles comprend un test de choc frontal qui consiste à projeter un véhicule contre une barrière déformable à une vitesse de 64 km/h. Lors de ce test, les efforts sont répartis sur environ une demi-largeur du véhicule (40%). Cependant, un tel test ne représente pas tous les cas de choc frontaux, et notamment certains plus sévères qui sont dirigés contre un obstacle non déformable, tel qu'un poteau, localisé uniquement d'un côté du véhicule. Un nouveau test de choc frontal à faible recouvrement a donc été établi et consiste à projeter le véhicule contre une barrière non déformable à une vitesse de 64 km/h et ne recouvrant que 25% de la largeur du véhicule. Lors d'un tel choc, le brancard avant disposé du côté de la barrière va être comprimé et plié du côté intérieur du véhicule. En situation réelle, une telle barrière risque alors d'atteindre l'habitacle et de blesser les occupants du véhicule. Il y a donc un besoin pour limiter, voire empêcher, les dommages corporels des occupants du véhicule lors d'un choc frontal à faible recouvrement. Le document FR2986490 décrit un véhicule dont chaque brancard présente un renfort dans sa portion courbée épousant la partie remontée du plancher. Ce renfort peut être droit ou présenter une courbure inverse à la courbure de ladite portion. Lors d'un choc frontal, les renforts permettent de diminuer la flexion des brancards au niveau de cette portion de sorte à ce qu'il reste en position et absorbe les efforts. Today, the approval of motor vehicles includes a frontal impact test that involves projecting a vehicle against a deformable barrier at a speed of 64 km / h. During this test, the forces are distributed over approximately half a width of the vehicle (40%). However, such a test does not represent all cases of frontal impact, including some more severe that are directed against a non-deformable obstacle, such as a pole, located only on one side of the vehicle. A new low-impact frontal impact test has therefore been established and consists in projecting the vehicle against a non-deformable barrier at a speed of 64 km / h and covering only 25% of the width of the vehicle. During such an impact, the front stretcher disposed on the side of the barrier will be compressed and folded on the inside of the vehicle. In real situations, such a barrier may then reach the passenger compartment and injure the occupants of the vehicle. There is therefore a need to limit or even prevent the bodily injury of the occupants of the vehicle during a frontal collision with low recovery. The document FR2986490 describes a vehicle, each stretcher has a reinforcement in its curved portion conforming to the raised portion of the floor. This reinforcement may be straight or have a curvature inverse to the curvature of said portion. During a frontal impact, the reinforcements allow to reduce the bending of the stretchers at this portion so that it remains in position and absorbs the forces.
Le document FR3001932 décrit une partie avant de la caisse d'un véhicule, configurée pour un choc frontal à faible recouvrement. A cet effet, ladite partie avant comprend de chaque côté, entre le bouclier avant et la roue avant, une cale de renfort fixée près de l'avant de l'un des deux brancards avant. Lors d'un choc frontal, la cale va s'appuyer contre la roue avant et empêcher la rotation de cette dernière, de sorte que celle-ci reste en ligne et vienne charger de façon stable le longeron de bas de caisse placé derrière. Cela a pour effet de limiter la pénétration de la barrière dans le véhicule. The document FR3001932 describes a front part of the body of a vehicle, configured for a low overlap frontal impact. For this purpose, said front part comprises on each side, between the front bumper and the front wheel, a reinforcement wedge attached near the front of one of the two front stretchers. During a frontal impact, the shim will be against the front wheel and prevent the rotation of the latter, so that it remains in line and comes stably load the sill spar behind. This has the effect of limiting the penetration of the barrier in the vehicle.
Ces dispositifs sont intéressants, mais malheureusement ils ne permettent pas d'éviter un pliage des brancards du côté intérieur du véhicule lors d'un choc frontal à faible recouvrement. Il y a donc un besoin pour un dispositif qui permette d'éviter ou au moins de limiter les risques de pliage des brancards du côté intérieur du véhicule lors d'un choc frontal à faible recouvrement. These devices are interesting, but unfortunately they do not prevent folding of stretchers on the inside of the vehicle during a frontal collision low recovery. There is therefore a need for a device that avoids or at least limit the risk of folding stretchers on the inside of the vehicle during a frontal collision low recovery.
L'invention a pour objectif de répondre à au moins un des problèmes rencontrés par l'art antérieur en proposant un nouveau véhicule configuré pour améliorer la résistance des brancards avant à des efforts obliques lors d'un choc frontal du véhicule. The invention aims to meet at least one of the problems encountered by the prior art by providing a new vehicle configured to improve the strength of the front stretchers to oblique forces during a frontal impact of the vehicle.
A cet effet, l'invention a pour objet un véhicule automobile comprenant deux brancards et un berceau d'où s'étendent en avant deux prolonges séparées par un entrefer, chaque prolonge s'étendant en dessous d'un des brancards et étant reliée audit brancard par un élément de soutien, le véhicule étant remarquable en ce qu'il comprend en outre un dispositif d'absorption disposé dans ledit entrefer et entre lesdites prolonges. For this purpose, the subject of the invention is a motor vehicle comprising two stretchers and a cradle from which extend forward two extensions separated by an air gap, each extension extending below one of the struts and being connected to said stretcher by a support member, the vehicle being remarkable in that it further comprises an absorption device disposed in said air gap and between said extensions.
Comme on l'aura compris à la lecture de la définition qui vient d'en être donnée, l'invention propose d'agencer un dispositif d'absorption entre les deux prolonges de berceau, de sorte que des efforts obliques reçus par lesdites prolonges soient absorbés. L'invention permet avantageusement de renforcer indirectement la résistance des brancards aux efforts obliques en renforçant les prolonges s'étendant en dessous et reliées auxdits brancards par des éléments de soutien. C'est donc l'ensemble brancard, élément de soutien et prolonge qui est ainsi renforcé et qui s'opposera à l'entrée d'un poteau de sorte à protéger les occupants du véhicule. Le dispositif d'absorption apporte donc une rigidité aux brancards qui permet, en outre, de faire dévier le véhicule de l'obstacle en début de choc et ainsi de décharger la structure arrière du véhicule en fin de choc. En effet, lors d'un choc frontal de faible recouvrement, cette rigidité des brancards permet avantageusement au véhicule de ne pas s'enrouler autour de l'obstacle, mais de glisser le long de cet obstacle. Ainsi, il y a une diminution des efforts que subit l'ensemble de la structure du véhicule lors du choc. Il est alors avantageusement possible d'alléger la structure du véhicule qui subit moins d'effort. Selon un mode particulier de réalisation de l'invention, le dispositif d'absorption comprend au moins un profilé transversal s'étendant d'une prolonge à l'autre, de préférence jusqu'à se placer au contact de celles-ci. Ainsi, les efforts obliques appliqués contre l'une des deux prolonges sont répartis sur l'autre prolonge. En effet, l'autre prolonge ne subit pas d'effort et servira d'appui stable pour les profilés. As will be understood from reading the definition that has just been given, the invention proposes to arrange an absorption device between the two cradle extensions, so that oblique forces received by said extensions are absorbed. The invention advantageously makes it possible indirectly to reinforce the resistance of the stretchers to the oblique forces by reinforcing the extensions extending below and connected to said stretcher by supporting elements. It is therefore the whole stretcher, support element and extends which is thus reinforced and which will oppose the entry of a pole so as to protect the occupants of the vehicle. The absorption device thus provides a rigidity to stretchers which also allows to deflect the vehicle from the obstacle at the beginning of shock and thus to unload the rear structure of the vehicle end shock. Indeed, during a frontal collision of low overlap, this stiffness of the shafts advantageously allows the vehicle not to wrap around the obstacle, but to slide along this obstacle. Thus, there is a reduction in the forces experienced by the entire structure of the vehicle during the impact. It is then advantageously possible to lighten the structure of the vehicle which undergoes less effort. According to a particular embodiment of the invention, the absorption device comprises at least one transverse profile extending from one extension to the other, preferably until being in contact with them. Thus, the oblique forces applied against one of the two prolongs are distributed on the other prolongs. Indeed, the other extends does not undergo stress and will serve as a stable support for the profiles.
Selon un mode de réalisation de l'invention, le ou au moins un des profilés transversaux est disposé de manière non perpendiculaire à l'axe longitudinal du véhicule, et/ou le ou au moins un des profilés transversaux est disposé de manière perpendiculaire à l'axe longitudinal du véhicule. According to one embodiment of the invention, the or at least one of the transverse profiles is disposed non-perpendicularly to the longitudinal axis of the vehicle, and / or the or at least one of the transverse profiles is disposed perpendicular to the longitudinal axis of the vehicle.
Selon un mode de réalisation préférée de l'invention, le ou au moins un des profilés transversaux est disposé de manière non perpendiculaire par rapport à l'axe longitudinal du véhicule. De préférence, les prolonges comprennent une extrémité avant et le ou au moins un des profilés transversaux disposé de manière non perpendiculaire comprend une extrémité disposée au niveau de l'extrémité avant d'une des prolonges. Ainsi, la répartition des efforts se fait au plus tôt lors de la pénétration d'un poteau sur un côté de la face avant d'un véhicule. According to a preferred embodiment of the invention, the or at least one of the transverse sections is disposed non-perpendicularly with respect to the longitudinal axis of the vehicle. Preferably, the extensions comprise a front end and the or at least one of the transverse sections disposed non-perpendicularly comprises an end disposed at the front end of one of the extensions. Thus, the distribution of effort is at the earliest when penetrating a pole on one side of the front of a vehicle.
Selon un mode de réalisation de l'invention, le ou au moins un des profilés transversaux est disposé de manière perpendiculaire à l'axe longitudinal du véhicule. De préférence, les prolonges comprennent une extrémité avant et le ou au moins un des profilés transversaux disposé de manière perpendiculaire comprend deux extrémités disposées chacune au niveau de l'extrémité avant d'une des prolonges. De préférence encore, les éléments de soutien étant reliés par une traverse avant, le dispositif d'absorption comprend un profilé transversal disposé de manière perpendiculaire qui est au contact de ladite traverse avant. Plus préférentiellement, ledit profilé transversal est fixé à ladite traverse avant. Une telle configuration augmente la raideur du système d'absorption et donc sa capacité à absorber les efforts. According to one embodiment of the invention, the or at least one of the transverse sections is disposed perpendicularly to the longitudinal axis of the vehicle. Preferably, the extensions comprise a front end and the or at least one of the transverse profiles disposed perpendicularly comprises two ends each disposed at the front end of one of the extensions. More preferably, the support members being connected by a front cross member, the absorption device comprises a transverse profile disposed perpendicularly which is in contact with said front cross member. More preferably, said transverse section is fixed to said front cross member. Such a configuration increases the stiffness of the absorption system and therefore its ability to absorb the forces.
Selon un mode de réalisation particulier de l'invention, le dispositif d'absorption comprend en outre au moins un profilé disposé de manière parallèle à l'axe longitudinal du véhicule. De tels profilés longitudinaux permettent d'empêcher des éléments situés en avant de l'entrefer séparant les prolonges de pénétrer dans le véhicule, notamment lors de chocs frontaux à plus large recouvrement. De préférence, le dispositif d'absorption comprend en outre un profilé s'étendant d'une prolonge à l'autre et disposé de manière perpendiculaire à l'axe longitudinal du véhicule contre le berceau et étant au contact du ou des profilés longitudinaux. Cette configuration permet avantageusement de renforcer les appuis du ou des profilés longitudinaux. De préférence encore, le au moins un des profilés longitudinaux s'étend le long d'une des prolonges. According to a particular embodiment of the invention, the absorption device further comprises at least one profile disposed parallel to the longitudinal axis of the vehicle. Such longitudinal profiles can prevent elements located in front of the air gap separating extensions to enter the vehicle, especially during frontal shocks wider coverage. Preferably, the absorption device further comprises a profile extending from one extension to the other and disposed perpendicularly to the longitudinal axis of the vehicle against the cradle and being in contact with the longitudinal profile or profiles. This configuration advantageously makes it possible to reinforce the supports of the profile or profiles longitudinal. More preferably, the at least one of the longitudinal sections extends along one of the extensions.
Selon un mode de réalisation de l'invention, le dispositif d'absorption comprend au moins deux profilés transversaux et au moins un profilé intermédiaire s'étendant d'un profilé transversal à l'autre. Alternativement, ledit profilé intermédiaire est disposé de manière parallèle à l'axe longitudinal du véhicule. According to one embodiment of the invention, the absorption device comprises at least two transverse profiles and at least one intermediate profile extending from one transverse profile to the other. Alternatively, said intermediate section is disposed parallel to the longitudinal axis of the vehicle.
Selon un mode de réalisation de l'invention, le dispositif d'absorption comprend en outre au moins un profilé intermédiaire s'étendant entre un profilé et une prolonge. According to one embodiment of the invention, the absorption device further comprises at least one intermediate profile extending between a profile and a prolongation.
Selon un mode de réalisation particulier de l'invention, le dispositif d'absorption comprend en outre au moins un profilé intermédiaire s'étendant entre un profilé et une prolonge ou entre deux profilés. La présence de profilés intermédiaires permet d'augmenter la raideur du dispositif d'absorption et donc sa capacité à absorber les efforts. According to a particular embodiment of the invention, the absorption device further comprises at least one intermediate profile extending between a profile and an extension or between two profiles. The presence of intermediate profiles increases the stiffness of the absorption device and therefore its ability to absorb the forces.
De préférence, le ou au moins un des profilés est fixé aux prolonges, de préférence par l'intermédiaire de pattes de fixation. De préférence encore, la fixation est réalisée par vissage, notamment à l'aide d'au moins une vis auto-taraudeuse. L'utilisation de vis auto-taraudeuses permet de faciliter le montage des profilés, car elles ne nécessitent pas de perçage et de taraudage préalables sur les prolonges. Alternativement, la fixation est réalisée par soudage. Preferably, the or at least one of the profiles is attached to the extensions, preferably via fastening tabs. More preferably, the attachment is made by screwing, in particular using at least one self-tapping screw. The use of self-tapping screws facilitates the mounting of the profiles because they do not require drilling and tapping prior to the extensions. Alternatively, the fixing is performed by welding.
Selon un mode de réalisation particulier de l'invention, le ou au moins un des profilés est formé en métal ou en un matériau composite. De préférence, le ou au moins un des profilés est en acier ou en aluminium. Eventuellement, le ou au moins un des profilés est réalisé en un matériau thermoplastique. According to a particular embodiment of the invention, the or at least one of the profiles is formed of metal or a composite material. Preferably, the or at least one of the profiles is made of steel or aluminum. Optionally, the or at least one of the profiles is made of a thermoplastic material.
Selon un mode de réalisation préféré de l'invention, le dispositif comprend en outre un écran sous caisse et le ou au moins un des profilés est monté sur ledit écran ou est venu de matière avec ledit écran. Le dispositif de l'invention présente ainsi une double fonction d'absorption des efforts obliques et d'amélioration de l'aérodynamisme du véhicule. La présence d'un tel écran permet en effet de diminuer la formation de turbulence d'air en dessous du moteur lors du roulage du véhicule. En outre, la présence d'un tel écran permet d'augmenter la raideur du dispositif et donc sa capacité à absorber les efforts. According to a preferred embodiment of the invention, the device further comprises an underbody screen and the or at least one of the profiles is mounted on said screen or is integral with said screen. The device of the invention thus has a dual function of absorbing oblique forces and improving the aerodynamics of the vehicle. The presence of such a screen makes it possible to reduce the formation of turbulence of air below the engine during the running of the vehicle. In addition, the presence of such a screen increases the stiffness of the device and therefore its ability to absorb the forces.
De préférence, l'écran sous caisse recouvre au moins 30% des dimensions de l'entrefer séparant les deux prolonges, de préférence encore au moins 50%, préférentiellement au moins 70%, plus préférentiellement au moins 90%. Selon un mode de réalisation préféré, l'écran sous caisse couvre au moins les dimensions de l'entrefer séparant les deux prolonges. Preferably, the underbody screen covers at least 30% of the dimensions of the air gap separating the two extensions, more preferably at least 50%, preferably at least at least 70%, more preferably at least 90%. According to a preferred embodiment, the underbody screen covers at least the dimensions of the air gap separating the two extensions.
De préférence, l'écran sous caisse comprend au moins un bord latéral longeant une des prolonges et contre lequel s'appuie le ou au moins un des profilés. Preferably, the underbody screen comprises at least one side edge along one of the extensions and against which rests the or at least one of the profiles.
De préférence encore, les prolonges étant fixées en avant à des platines de fixation, l'écran sous caisse est fixé à au moins une prolonge et/ou à au moins une platine de fixation. De préférence, la fixation est réalisée par vissage, notamment à l'aide d'au moins une vis auto- taraudeuse. La fixation par vis auto-taraudeuses facilite le montage du dispositif d'absorption sur le véhicule. Alternativement, la fixation est réalisée par soudage. More preferably, the extensions being fixed forward to fixing plates, the underbody screen is attached to at least one extension and / or at least one mounting plate. Preferably, the attachment is made by screwing, in particular using at least one self-tapping screw. The attachment by self-tapping screws facilitates the mounting of the absorption device on the vehicle. Alternatively, the fixing is performed by welding.
Préférentiellement, l'écran sous caisse est formé en un matériau thermoplastique ou en un matériau composite. Lorsque l'écran comprend au moins un bord latéral longeant une des prolonges, il agit comme amortisseur avant la sollicitation des profilés. Ainsi, l'absorption des efforts par le dispositif est améliorée. En outre, un tel écran apporte une isolation acoustique de l'habitacle lorsque des objets, tel que des gravillons, remontent en direction de l'environnement moteur lors du roulage du véhicule. En effet, contrairement aux éléments en métal qui composent l'environnement moteur, un écran en matériau plastique permet d'absorber les vibrations sonores produites par un choc. Preferably, the underbody screen is formed of a thermoplastic material or a composite material. When the screen comprises at least one lateral edge along one of the extensions, it acts as a damper before the biasing of the profiles. Thus, the absorption of forces by the device is improved. In addition, such a screen provides an acoustic insulation of the passenger compartment when objects, such as chippings, back towards the engine environment when driving the vehicle. Indeed, unlike the metal elements that make up the engine environment, a plastic screen can absorb the sound vibrations produced by a shock.
De préférence, l'écran comprend un réseau de nervures. Un tel réseau permet d'augmenter la raideur de l'écran et donc la raideur du dispositif d'absorption. De préférence encore, le réseau de nervures comprend un ensemble de nervures en forme de nids d'abeilles. Preferably, the screen comprises a network of ribs. Such a network makes it possible to increase the stiffness of the screen and therefore the stiffness of the absorption device. More preferably, the rib network comprises a set of ribs in the form of honeycombs.
L'invention concerne également un dispositif d'absorption pour un véhicule tel que défini précédemment, remarquable en ce qu'il comprend un écran sous caisse et au moins un profilé transversal s'étendant d'un bord à l'autre dudit écran sous caisse de sorte à ce que le ou au moins un des profilés transversaux soit disposé de manière non perpendiculaire à l'axe longitudinal du véhicule, et/ou le ou au moins un des profilés transversaux soit disposé de manière perpendiculaire à l'axe longitudinal du véhicule. The invention also relates to an absorption device for a vehicle as defined above, remarkable in that it comprises an underbody screen and at least one transverse profile extending from one edge to the other of said underbody screen so that the or at least one of the transverse profiles is disposed non-perpendicular to the longitudinal axis of the vehicle, and / or the or at least one of the transverse profiles is disposed perpendicularly to the longitudinal axis of the vehicle .
L'invention sera bien comprise et d'autres aspects et avantages apparaîtront clairement à la lecture de la description qui suit, donnée à titre d'exemple en référence aux planches de dessins annexées sur lesquelles : - La figure 1 représente une vue de dessous d'une partie avant d'un véhicule selon l'invention comprenant un mode de réalisation d'un dispositif d'absorption selon l'invention. The invention will be well understood and other aspects and advantages will become clear from reading the description which follows, given by way of example with reference to the accompanying drawings in which: - Figure 1 shows a bottom view of a front portion of a vehicle according to the invention comprising an embodiment of an absorption device according to the invention.
- La figure 2 représente une vue de profil d'une partie avant d'un véhicule selon l'invention comprenant un autre mode de réalisation d'un dispositif d'absorption selon l'invention.  - Figure 2 shows a side view of a front portion of a vehicle according to the invention comprising another embodiment of an absorption device according to the invention.
- La figure 3 représente une vue séparée d'une partie avant d'un véhicule et d'un écran sous caisse selon l'invention. Dans la description qui suit, le terme « comprendre » est synonyme de « inclure » et n'est pas limitatif en ce qu'il autorise la présence d'autres éléments dans le véhicule ou le dispositif d'absorption auquel il se rapporte. Il est entendu que le terme « comprendre » inclut les termes « consister en ». Les termes « avant » et « arrière » ainsi que les directions « longitudinale » et « transversale » s'entendront par rapport à l'orientation générale du véhicule. Les termes « bas » et « inférieur » indiqueront une proximité avec le sol plus importante que respectivement les termes « haut » et « supérieur ». Sur les différentes figures, les mêmes références désignent des éléments identiques ou similaires.  - Figure 3 shows a separate view of a front portion of a vehicle and an underbody screen according to the invention. In the following description, the term "understand" is synonymous with "include" and is not limiting in that it allows the presence of other elements in the vehicle or the absorption device to which it relates. It is understood that the term "understand" includes the words "consist of". The terms "front" and "rear" as well as the "longitudinal" and "transverse" directions will be understood in relation to the general orientation of the vehicle. The terms "low" and "lower" will indicate a greater proximity to the ground than the terms "high" and "higher" respectively. In the different figures, the same references designate identical or similar elements.
On se référera en premier lieu à la figure 1 qui représente une vue de dessous d'une partie avant d'un véhicule 1 selon l'invention. Cette partie avant est composée de deux brancards 3 avant s'étendant selon la direction longitudinale du véhicule 1 et de part et d'autre d'un moteur (non représenté). En avant de ces brancards 3 sont présents des absorbeurs sur lesquels est montée une poutre 5 de pare-chocs. Cette poutre de pare-chocs porte une peau de pare- chocs (non représentée) qui forme en partie la façade avant du véhicule 1 . Des éléments de soutien 7, également appelés appuis façade, sont fixés aux extrémités avant des brancards et soutiennent le bloc de façade avant (non représenté) s'étendant entre les deux éléments de soutien 7. Ce bloc de façade avant comprend un échangeur thermique, tel qu'un radiateur de circuit de refroidissement de moteur ou de circuit de refroidissement d'air de suralimentation, ou encore un condensateur de circuit de climatisation de l'habitacle. Referring firstly to Figure 1 which shows a bottom view of a front portion of a vehicle 1 according to the invention. This front portion is composed of two front stretchers extending in the longitudinal direction of the vehicle 1 and on both sides of a motor (not shown). In front of these shafts 3 are absorbers on which is mounted a bumper beam 5. This bumper beam carries a bumper skin (not shown) which forms part of the front of the vehicle 1. Support elements 7, also called facade supports, are attached to the front ends of the shafts and support the front facade block (not shown) extending between the two support elements 7. This front panel block comprises a heat exchanger, such as an engine cooling circuit radiator or charge air cooling circuit, or a passenger compartment air conditioning circuit capacitor.
Le véhicule comprend entre outre un berceau 9 d'où s'étendent en avant deux prolonges 1 1 fixées par leurs extrémités avant aux éléments de soutien 7. Les éléments de soutien 7 sont reliés dans leur partie inférieure par une traverse avant qui est disposée en avant desdites prolonges 1 1 et sous l'échangeur thermique. Par ailleurs, les prolonges 1 1 sont séparées par un entrefer et sont disposées en dessous chacune d'un des deux brancards 3. Les extrémités avant des prolonges 1 1 sont également fixées à des platines de fixation sur lesquelles sont montés des absorbeurs. Ces absorbeurs portent une deuxième poutre de pare-chocs ou poutre inférieure de pare-chocs. The vehicle further comprises a cradle 9 from which extend forward two extensions 1 1 fixed by their front ends to the support elements 7. The support elements 7 are connected in their lower part by a front cross member which is arranged in before said extensions 1 1 and under the heat exchanger. Furthermore, the extensions 1 1 are separated by an air gap and are arranged below each of one of the two stretchers 3. The front ends of the extensions 1 1 are also fixed to fixing plates on which are mounted absorbers. These absorbers carry a second bumper beam or lower bumper beam.
Le véhicule 1 est remarquable en ce qu'il comprend en outre un dispositif d'absorption 13 disposé dans l'entrefer séparant les deux prolonges 1 1 et au contact desdites prolonges 1 1 . Le dispositif de l'invention permet d'absorber les efforts obliques que subit une des deux prolonges 1 1 lors d'un choc frontal à faible recouvrement. La raideur de ladite prolonge 1 1 est ainsi améliorée, ce qui permet de limiter voire d'éviter que le brancard 3 disposé au-dessus ne soit plié vers l'intérieur du véhicule 1 . Cet effet est obtenu grâce à la fixation mutuelle du brancard 3 et de la traverse à un même élément de soutien 7. Avantageusement, la mise en place du dispositif de l'invention ne nécessite pas de modification du véhicule 1 , et peut donc être facilement intégré aux véhicules lors de leur montage. The vehicle 1 is remarkable in that it further comprises an absorption device 13 disposed in the air gap separating the two extensions 1 1 and in contact with said extensions 1 1. The device of the invention makes it possible to absorb the oblique forces experienced by one of the two extensions 1 1 during a frontal collision with little overlap. The stiffness of said extension 1 1 is thus improved, which makes it possible to limit or even prevent the stretcher 3 disposed above from being folded towards the inside of the vehicle 1. This effect is obtained thanks to the mutual attachment of the stretcher 3 and the crossbar to the same support element 7. Advantageously, the implementation of the device of the invention does not require modification of the vehicle 1, and can therefore be easily integrated into vehicles during their assembly.
Selon un mode de réalisation, le dispositif d'absorption 13 comprend au moins un profilé transversal (15, 17) reliant les deux prolonges 1 1 . Ainsi, lors d'un choc frontal à faible recouvrement, les efforts subis par une des prolonges 1 1 sont reportés sur l'autre prolonge 1 1 . L'autre prolonge 1 1 ne subissant pas d'effort du choc frontal, l'invention permet de profiter de sa rigidité pour absorber les efforts au travers des profilés. Selon un mode de réalisation, le dispositif d'absorption 13 comprend au moins un profilé transversal 15 disposé de manière non perpendiculaire par rapport à l'axe longitudinal du véhicule 1 . De préférence, l'extrémité avant du profilé ou d'au moins un des profilés transversaux 15 disposé de manière non perpendiculaire, est disposée au niveau de l'extrémité avant de la prolonge 1 1 . Ainsi, les efforts sont répartis et absorbés au plus tôt dans la cinématique du choc frontal. Par ailleurs et comme il est représenté, l'extrémité arrière dudit profilé 15 peut être disposée au niveau de l'extrémité arrière de l'autre prolonge 1 1 . Alternativement, l'extrémité arrière peut être disposée le long de l'autre prolonge, par exemple au niveau du milieu de ladite prolonge. Selon un mode de réalisation de l'invention, le dispositif d'absorption 13 comprend au moins un profilé transversal 17 disposé de manière perpendiculaire à l'axe longitudinal du véhicule 1 . Un tel profilé permet également de répartir les efforts subis par une des prolonges 1 1 sur l'autre prolonge 1 1 . De préférence, les extrémités du ou d'un des profilés transversaux 17 disposé de manière perpendiculaire sont agencées au niveau des extrémités avant des prolonges 1 1 . Comme il est représenté, ce profilé transversal 17 peut être au contact de la traverse avant reliant les deux éléments de soutien 7, augmentant la raideur de ce profilé et donc la raideur du dispositif. De préférence, ledit profilé transversal 17 est fixé à ladite traverse avant. According to one embodiment, the absorption device 13 comprises at least one transverse profile (15, 17) connecting the two extensions 1 1. Thus, during a frontal collision with a low overlap, the forces experienced by one of the extensions 1 1 are transferred to the other prolongs 1 1. The other extends 1 1 not undergoing the frontal impact force, the invention allows to take advantage of its rigidity to absorb the forces through the profiles. According to one embodiment, the absorption device 13 comprises at least one transverse profile 15 arranged non-perpendicularly with respect to the longitudinal axis of the vehicle 1. Preferably, the front end of the profile or at least one of the transverse sections 15 arranged in a non-perpendicular manner, is disposed at the front end of the extension 1 1. Thus, the forces are distributed and absorbed as early as possible in the kinematics of the frontal impact. Moreover and as shown, the rear end of said profile 15 may be disposed at the rear end of the other extension 1 1. Alternatively, the rear end may be disposed along the other extends, for example at the middle of said extension. According to one embodiment of the invention, the absorption device 13 comprises at least one transverse section 17 disposed perpendicularly to the longitudinal axis of the vehicle 1. Such a profile also makes it possible to distribute the forces undergone by one of the extensions 1 1 on the other prolongs 1 1. Preferably, the ends of the or one of the transverse profiles 17 disposed perpendicularly are arranged at the front ends of the extensions 1 1. As shown, this transverse section 17 can be in contact with the front cross member connecting the two support elements 7, increasing the stiffness of this profile and therefore the stiffness of the device. Preferably, said transverse section 17 is fixed to said front cross member.
De préférence, les profilés transversaux (15, 17) sont répartis sur toute la longueur des prolonges 1 1 de sorte à améliorer la répartition des efforts. Preferably, the transverse sections (15, 17) are distributed over the entire length of the extensions 1 1 so as to improve the distribution of forces.
Selon un mode de réalisation, le dispositif d'absorption 13 comprend en outre au moins un profilé longitudinal 19 disposé de manière parallèle à l'axe longitudinal du véhicule 1 . Ainsi le dispositif d'absorption 13 de l'invention permet de limiter, voire d'empêcher, un déplacement du bloc de façade avant lors d'un choc avant et participe à l'absorption des efforts lors d'un choc frontal de plus grands recouvrements. De préférence et comme représenté sur la figure 1 , le dispositif d'absorption 13 comprend un profilé transversal 17 disposé de manière perpendiculaire agencé au contact du berceau 9 et contre lequel s'appuient le ou les profilés longitudinaux 19. De préférence, le ou au moins un des profilés longitudinaux longe une des prolonges. De préférence encore, ledit profilé est au contact de ladite prolonge. According to one embodiment, the absorption device 13 further comprises at least one longitudinal profile 19 disposed parallel to the longitudinal axis of the vehicle 1. Thus, the absorption device 13 of the invention makes it possible to limit or even prevent movement of the front wall block during a front impact and participates in absorbing the forces during a larger frontal impact. recoveries. Preferably, and as shown in FIG. 1, the absorption device 13 comprises a perpendicular transverse profile 17 arranged in a manner in contact with the cradle 9 and against which the longitudinal profile or profiles 19 rest. Preferably, the at least one of the longitudinal sections runs along one of the extensions. More preferably, said profile is in contact with said extension.
En se tournant vers la figure 2, on peut voir que selon un mode particulier de réalisation de l'invention, le dispositif d'absorption 13 comprend en outre au moins un profilé intermédiaire 21 reliant une prolonge 1 1 et un profilé (transversal ou longitudinal), ou deux profilés (transversaux ou longitudinaux). Ces profilés intermédiaires 21 renforcent la raideur du dispositif 3. De préférence, l'ensemble des profilés (15, 17, 19, 21 ) forme un treillis. Turning to FIG. 2, it can be seen that according to a particular embodiment of the invention, the absorption device 13 furthermore comprises at least one intermediate profile 21 connecting a continuation 1 1 and a profile (transverse or longitudinal ), or two profiles (transverse or longitudinal). These intermediate profiles 21 reinforce the stiffness of the device 3. Preferably, all the profiles (15, 17, 19, 21) form a lattice.
Les différents profilés (transversaux, longitudinaux et intermédiaires) sont de préférences fixées aux prolonges 1 1 lorsqu'ils sont à leur contact. Cette fixation peut se faire par tout moyen et notamment par l'intermédiaire d'au moins une patte de fixation. La fixation peut être réalisée par soudage ou par vissage notamment à l'aide d'au moins une vis auto-taraudeuse. Les vis auto-taraudeuses sont avantageuses par rapport à des vis normales en ce qu'elles ne nécessitent pas de perçage préalable à l'endroit où elles sont fixées et ainsi leur utilisation facilite le montage du dispositif. Elles permettent également une fixation plus rapide que par soudage. The different profiles (transverse, longitudinal and intermediate) are preferably fixed to the extensions 1 1 when they are in contact. This fixing can be done by any means and in particular by means of at least one bracket. Fixing can be performed by welding or screwing including using at least one self-tapping screw. Self-tapping screws are advantageous over normal screws in that they do not require drilling before the place where they are fixed and thus their use facilitates the mounting of the device. They also allow faster fastening than by welding.
Par ailleurs, les différents profilés (15, 17, 19, 21 ) peuvent présenter une coupe transversale de n'importe quelle forme, et notamment de forme rectangulaire, circulaire, triangulaire, de préférence rectangulaire ou circulaire. Furthermore, the various sections (15, 17, 19, 21) may have a cross section of any shape, including rectangular, circular, triangular, preferably rectangular or circular.
Selon un mode de réalisation préféré de l'invention représenté en figure 2, le dispositif de l'invention comprend en outre un écran sous caisse 23 et le ou au moins un des profilés est monté ou venu de matière avec ledit écran 23. Un tel écran 23 apporte d'une part une rigidité supplémentaire au dispositif, et d'autre part une fonction d'aérodynamisme en limitant la formation de turbulences en dessous du moteur. Le dispositif de l'invention présente alors une double fonction. According to a preferred embodiment of the invention shown in FIG. 2, the device of the invention further comprises an underbody screen 23 and the or at least one of the profiles is mounted or made of material with said screen 23. Such a screen 23 provides on the one hand an additional rigidity to the device, and on the other hand an aerodynamic function by limiting the formation of turbulence below the engine. The device of the invention then has a dual function.
Comme il est visible sur la figure 3, l'écran peut être monté sur une partie avant d'un véhicule déjà existant sans nécessiter de modifications dudit véhicule. L'invention est donc facilement adaptable à tout type de véhicule. En outre, le dispositif d'absorption selon l'invention, peut être monté ou non sur une série de véhicules sans nécessiter de modifications majeures de la chaîne de production. As can be seen in FIG. 3, the screen can be mounted on a front part of an already existing vehicle without requiring modifications of said vehicle. The invention is therefore easily adaptable to any type of vehicle. In addition, the absorption device according to the invention can be mounted or not on a series of vehicles without major modifications of the production line.
La présence d'un tel dispositif permet en outre de diminuer l'épaisseur des parois du ou des profilés. Notamment, lorsque les profilés sont en métal ces derniers peuvent présenter une épaisseur comprise entre 1 ,0 et 2,0 mm, de préférence entre 1 ,3 et 1 ,8 mm. Lorsque les profilés sont en matériau composite, leur épaisseur peut être comprise entre 3,0 et 5,0 mm, de préférence entre 3,5 et 4,5 mm. The presence of such a device also makes it possible to reduce the thickness of the walls of the profile or profiles. In particular, when the profiles are metal these may have a thickness of between 1.0 and 2.0 mm, preferably between 1.3 and 1.8 mm. When the profiles are made of composite material, their thickness can be between 3.0 and 5.0 mm, preferably between 3.5 and 4.5 mm.
De préférence, l'écran sous caisse 23 recouvre au moins 30% des dimensions de l'entrefer séparant les deux prolonges 1 1 , de préférence encore au moins 50%, préférentiellement au moins 70%, plus préférentiellement au moins 90%. Selon un mode de réalisation préféré, l'écran sous caisse 23 couvre au moins les dimensions de l'entrefer séparant les deux prolonges 1 1 . Preferably, the underbody screen 23 covers at least 30% of the dimensions of the air gap separating the two extensions 1 1, more preferably at least 50%, preferably at least 70%, more preferably at least 90%. According to a preferred embodiment, the underbody screen 23 covers at least the dimensions of the air gap separating the two extensions 1 1.
Selon un mode de réalisation de l'invention, l'écran 23 comprend au moins un bord latéral longeant l'une des deux prolonges 1 1 et contre lequel s'appuie le ou au moins un des profilés. Alternativement ou de manière intermédiaire, un profilé venu de matière avec l'écran 23 peut s'étendre depuis ledit bord latéral. De préférence, ledit bord latéral est en contact avec ladite prolonge 1 1 . L'écran 23 peut être fixé aux prolonges 1 1 et/ou aux platines de fixation. Cette fixation peut se faire par tout moyen et notamment par soudage ou par vissage à l'aide par exemple d'au moins une vis auto-taraudeuse. According to one embodiment of the invention, the screen 23 comprises at least one side edge along one of the two extensions 1 1 and against which the or at least one of the profiles. Alternatively or intermediately, a profile integral with the screen 23 may extend from said side edge. Preferably, said lateral edge is in contact with said extension 1 1. The screen 23 may be attached to the extensions 1 1 and / or to the fixing plates. This attachment can be done by any means and in particular by welding or screwing using for example at least one self-tapping screw.
L'écran 23 et les différents profilés (15, 17, 19, 21 ) peuvent être formés en matériau plastique ou en matériau composite, de préférence en matériau composite. Le matériau composite sélectionné peut être un matériau composite thermoplastique ou thermodurcissable. Les matériaux composites sont définis dans le cadre de l'invention comme présentant une matrice polymère et un ou plusieurs éléments de renforcement. Les éléments de renforcement comprennent ou sont constitués par des fibres ou un mélange de fibres sélectionnées parmi les fibres de verre, de carbone, de céramique, de graphite, naturelles telles que des fibres de lin, de chanvre ou de bambou, de polymères organiques tels que des fibres de polyester. De préférence les fibres des éléments de renforcement sont des fibres de verre. The screen 23 and the various profiles (15, 17, 19, 21) may be formed of plastic material or composite material, preferably of composite material. The composite material selected may be a thermoplastic or thermosetting composite material. Composite materials are defined within the scope of the invention as having a matrix polymer and one or more reinforcing elements. The reinforcing elements comprise or consist of fibers or a mixture of fibers selected from glass, carbon, ceramic, graphite, natural fibers such as flax, hemp or bamboo fibers, organic polymers such as than polyester fibers. Preferably the fibers of the reinforcing elements are glass fibers.
La matrice polymère thermoplastique sera avantageusement sélectionnée parmi un ou plusieurs matériaux choisis entre les polypropylènes (PP), les polyphtalamides (PPA), les polyétheréthercétones (PEEK), les polysulfures de phénylène (PPS), les polyamides-imide (PAI), les polyétherimides (PEI), les polyarylamides (PAA), ou les polyamides (PA) tel que par exemple du polyamide 6 (PA 6 ou polycaprolactame) ou du polyamide 6.6 (PA 6.6 ou polyhexaméthylène adipamide). The thermoplastic polymer matrix will advantageously be selected from one or more materials selected from polypropylenes (PP), polyphthalamides (PPA), polyetheretherketones (PEEK), phenylene polysulfides (PPS), polyamide imides (PAI), polyetherimides (PEI), polyarylamides (PAA), or polyamides (PA) such as for example polyamide 6 (PA 6 or polycaprolactam) or polyamide 6.6 (PA 6.6 or polyhexamethylene adipamide).
La matrice polymère thermodurcissable sera avantageusement sélectionnée parmi les polyesters insaturés, les polyuréthanes, les vinylesters ou les polyépoxydes. The thermosetting polymer matrix will advantageously be selected from unsaturated polyesters, polyurethanes, vinylesters or polyepoxides.
Alternativement, les différents profilés (15, 17, 19, 21 ) peuvent être formés en métal tels que l'acier ou en aluminium, de préférence en aluminium. Lorsque l'écran 23 comprend au moins un bord longeant une des deux prolonges 1 1 et que le ou au moins un des profilés est au contact de ce bord, l'utilisation d'un matériau thermoplastique ou d'un matériau composite permet audit bord d'agir comme amortisseur lors d'un choc frontal avant la sollicitation des profilés. Ainsi, le dispositif d'absorption 13 est plus performant dans son absorption de l'énergie. Alternatively, the different sections (15, 17, 19, 21) can be formed of metal such as steel or aluminum, preferably aluminum. When the screen 23 comprises at least one edge along one of the two extensions 1 1 and the or at least one of the profiles is in contact with this edge, the use of a thermoplastic material or a composite material allows said edge to act as a shock absorber during a frontal impact before the solicitation of the profiles. Thus, the absorption device 13 is more efficient in its absorption of energy.
De préférence, l'écran sous-caisse comprend un réseau de nervures. Un tel réseau permet d'augmenter la raideur de l'écran et donc la raideur du dispositif d'absorption. De préférence encore, le réseau de nervures comprend un ensemble de nervures en forme de nids d'abeilles. Preferably, the underbody screen comprises a network of ribs. Such a network makes it possible to increase the stiffness of the screen and therefore the stiffness of the absorption device. More preferably, the rib network comprises a set of ribs in the form of honeycombs.

Claims

REVENDICATIONS
1 . Véhicule (1 ) automobile comprenant deux brancards (3) et un berceau (9) d'où s'étendent en avant deux prolonges (1 1 ) séparées par un entrefer, chaque prolonge (1 1 ) s'étendant en dessous d'un des brancards (3) et étant reliée audit brancard (3) par un élément de soutien (7), le véhicule (1 ) étant caractérisé en ce qu'il comprend en outre un dispositif d'absorption (13) disposé dans ledit entrefer et entre lesdites prolonges (1 1 ). 1. Vehicle (1) comprising two stretcher (3) and a cradle (9) from which extend two prolonged (1 1) separated by an air gap, each extension (1 1) extending below a stretchers (3) and being connected to said stretcher (3) by a supporting element (7), the vehicle (1) being characterized in that it further comprises an absorption device (13) disposed in said air gap and between said extensions (1 1).
2. Véhicule (1 ) selon la revendication 1 , caractérisé en ce que le dispositif d'absorption (13) comprend au moins un profilé transversal (15, 17) s'étendant d'une prolonge (1 1 ) à l'autre, de préférence jusqu'à se placer au contact de celles-ci. 2. Vehicle (1) according to claim 1, characterized in that the absorption device (13) comprises at least one transverse profile (15, 17) extending from one extension (1 1) to the other, preferably until they come into contact with them.
3. Véhicule (1 ) selon la revendication 2, caractérisé en ce que le ou au moins un des profilés transversaux (15) est disposé de manière non perpendiculaire à l'axe longitudinal du véhicule (1 ), et/ou le ou au moins un des profilés transversaux (17) est disposé de manière perpendiculaire à l'axe longitudinal du véhicule (1 ). 3. Vehicle (1) according to claim 2, characterized in that the or at least one of the transverse profiles (15) is disposed non-perpendicular to the longitudinal axis of the vehicle (1), and / or the or at least one of the transverse sections (17) is arranged perpendicularly to the longitudinal axis of the vehicle (1).
4. Véhicule (1 ) selon la revendication 2 ou 3, caractérisé en ce que le dispositif d'absorption (13) comprend au moins deux profilés transversaux (15,17) et au moins un profilé (21 ) intermédiaire s'étendant d'un profilé transversal (15) à l'autre (17). 4. Vehicle (1) according to claim 2 or 3, characterized in that the absorption device (13) comprises at least two transverse sections (15,17) and at least one intermediate section (21) extending from a cross section (15) to the other (17).
5. Véhicule (1 ) selon l'une des revendications 2 à 4, caractérisé en ce que le dispositif d'absorption (13) comprend en outre au moins un profilé intermédiaire (21 ) s'étendant entre un profilé (15, 17) et une prolonge (1 1 ). 5. Vehicle (1) according to one of claims 2 to 4, characterized in that the absorption device (13) further comprises at least one intermediate profile (21) extending between a profile (15, 17) and an extension (1 1).
6. Véhicule (1 ) selon l'une des revendications 2 à 5, caractérisé en ce que le ou au moins un des profilés (15, 17, 21 ) est formé en métal ou en un matériau composite. 6. Vehicle (1) according to one of claims 2 to 5, characterized in that the or at least one of the profiles (15, 17, 21) is formed of metal or a composite material.
7. Véhicule (1 ) selon l'une des revendications 2 à 6, caractérisé en ce que le dispositif comprend en outre un écran sous caisse (23) et en ce que le ou au moins un des profilés (15, 17, 21 ) est monté sur ledit écran (23) ou est venu de matière avec ledit écran (23). 7. Vehicle (1) according to one of claims 2 to 6, characterized in that the device further comprises an underbody screen (23) and in that the or at least one of the profiles (15, 17, 21). is mounted on said screen (23) or is integral with said screen (23).
8. Véhicule (1 ) selon la revendication 7, caractérisé en ce que l'écran sous caisse (23) comprend au moins un bord latéral longeant une des prolonges (1 1 ) et contre lequel s'appuie le ou au moins un des profilés (15, 17, 21 ). 8. Vehicle (1) according to claim 7, characterized in that the underbody screen (23) comprises at least one side edge along one of the extensions (1 1) and against which rests the or at least one of the profiles (15, 17, 21).
9. Véhicule (1 ) selon la revendication 7 ou 8, les prolonges (1 1 ) étant fixée en avant à des platines de fixation, caractérisé en ce que l'écran sous caisse (23) est fixé à au moins une prolonge (1 1 ) et/ou à au moins une platine de fixation, de préférence, la fixation est réalisée par vissage, notamment à l'aide d'au moins une vis autotaraudeuse. 9. Vehicle (1) according to claim 7 or 8, the extensions (1 1) being fixed forwardly to fixing plates, characterized in that the underbody screen (23) is attached to at least one extension (1). 1) and / or at least one fixing plate, preferably, the fixing is carried out by screwing, in particular using at least one self-tapping screw.
10. Dispositif d'absorption (13) pour un véhicule (1 ) selon l'une des revendications 7 à 9, caractérisé en ce qu'il comprend un écran sous caisse (23) et au moins un profilé transversal (15, 17) s'étendant d'un bord à l'autre dudit écran sous caisse (23), de sorte à ce que le ou au moins un des profilés transversaux (15) soit disposé de manière non perpendiculaire à l'axe longitudinal du véhicule (1 ), et/ou le ou au moins un des profilés transversaux (17) soit disposé de manière perpendiculaire à l'axe longitudinal du véhicule (1 ). 10. Absorption device (13) for a vehicle (1) according to one of claims 7 to 9, characterized in that it comprises an underbody screen (23) and at least one transverse profile (15, 17). extending from one edge to the other of said underbody screen (23), so that the or at least one of the transverse sections (15) is arranged non-perpendicularly to the longitudinal axis of the vehicle (1). ), and / or the or at least one of the transverse profiles (17) is arranged perpendicularly to the longitudinal axis of the vehicle (1).
EP18773794.5A 2017-09-27 2018-08-27 Vehicle comprising a small-overlap frontal-impact absorption device Pending EP3844050A1 (en)

Applications Claiming Priority (2)

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FR1758935A FR3071466B1 (en) 2017-09-27 2017-09-27 VEHICLE INCLUDING A LOW COVER FRONTAL IMPACT ABSORPTION DEVICE.
PCT/FR2018/052102 WO2019063895A1 (en) 2017-09-27 2018-08-27 Vehicle comprising a small-overlap frontal-impact absorption device

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EP (1) EP3844050A1 (en)
CN (1) CN111148681B (en)
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FR3071466B1 (en) 2021-07-09
FR3071466A1 (en) 2019-03-29
WO2019063895A1 (en) 2019-04-04
US20200353985A1 (en) 2020-11-12
US11279410B2 (en) 2022-03-22
CN111148681B (en) 2022-09-16

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