EP4413280A1 - Dispositif d'absorption d'energie - Google Patents
Dispositif d'absorption d'energieInfo
- Publication number
- EP4413280A1 EP4413280A1 EP22772526.4A EP22772526A EP4413280A1 EP 4413280 A1 EP4413280 A1 EP 4413280A1 EP 22772526 A EP22772526 A EP 22772526A EP 4413280 A1 EP4413280 A1 EP 4413280A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- energy absorbing
- absorbing device
- reinforcing piece
- piece
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
- F16F7/122—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure characterised by corrugations, e.g. of rolled corrugated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/001—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material
- B62D29/004—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material the metal being over-moulded by the synthetic material, e.g. in a mould
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- 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
-
- 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
- F16F7/124—Vibration-dampers; Shock-absorbers using plastic deformation of members characterised by their special construction from fibre-reinforced plastics
-
- 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
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0241—Fibre-reinforced plastics [FRP]
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- 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
- F16F2226/00—Manufacturing; Treatments
- F16F2226/04—Assembly or fixing methods; methods to form or fashion parts
Definitions
- the present invention relates to the field of energy absorption devices fitted to a vehicle, in particular an automobile. More particularly, the invention relates to an energy absorber device arranged on an element to be protected of a vehicle, in particular an automobile, the element to be protected being for example a body of the vehicle or an electric battery of the vehicle.
- Motor vehicle energy absorber devices are usually installed between a bumper and a side member of said vehicle, or near a vehicle power supply device such as an electric battery. Whether they are positioned at the level of the front bumper, the rear bumper or the electrical supply device of the motor vehicle, these energy absorbing devices have the function of absorbing at least part of the energy transferred to the vehicle during potential impacts with external objects.
- the energy absorption devices make it possible to prevent this energy from being transmitted entirely to the longitudinal members of the vehicle or to the electric battery thereof and thus to limit their deformation during these impacts, it being understood that the replacement of a spar, an important structural element of the vehicle underbody, or of the electric battery would require costly operations.
- a reinforcing piece which covers at least part of this composite material and which improves its impact resistance capabilities.
- this part made of composite material and of this reinforcing part is however complex, these two elements having for example to be held in position relative to each other in order to undergo various machining steps such as deformation by heating to give an appropriate shape to the composite material and an overmolding operation to fix the position of the composite material within the formed support by the plastic part.
- the present invention aims to overcome this drawback by proposing an energy absorbing device in which the part made of composite material and the reinforcing part are joined to one another, so that the machining of the assembly thus formed is facilitated.
- the main object of the present invention is thus an energy absorbing device for a vehicle comprising at least one core, composed of at least one energy absorbing material, and a plastic structure molded on the core to form a one-piece assembly.
- the device comprises at least one reinforcing part forming a local extra thickness of the core and the device further comprises at least one mechanical retaining element contributing to maintaining the core and the at least one reinforcement.
- Such an energy-absorbing device has the function of absorbing at least part of the energy of an impact undergone by the vehicle.
- the core is a part of this energy absorbing device, its composition giving it impact resistance properties by allowing it to absorb energy in the event of an impact.
- a plastic structure is molded on this core, acting as a support piece which allows the correct position of the core prior to impact.
- the energy absorbing device according to the invention also comprises at least one reinforcing piece, which is intended to be inserted between the core and the plastic structure. Such a reinforcement piece, by forming a local extra thickness of the core, makes it possible to further improve its impact resistance.
- the core and the reinforcement piece are made integral by means of one or more mechanical retaining elements, this or these elements offering a solution to the positioning problems of the prior art. More specifically, the reinforcement piece must be positioned precisely so that it has the expected technical effect once the energy absorber device on the vehicle, and the reinforcement part should retain this theoretical position relative to the core until the overmolding of the plastic structure freezes the position of the reinforcement part.
- the specific mechanical retaining element or elements of the invention make it possible to ensure that the reinforcement part is in the desired theoretical position at the time of the overmolding mentioned.
- gluing is easier to implement, but requires a particular composition of the adhesive to adapt to the properties of the materials used to make the core and the reinforcing piece, whereas, according to the invention, the implementation of a mechanical holding means makes it possible to adapt to all types of composite materials, without, moreover, being sensitive to the heating conditions that the sub-assembly thus formed may undergo in order to be deformed and have a particular shape on which is overmolded the plastic structure.
- the energy absorbing material comprises a plastic material and at least one consolidation material, in particular based on carbon fibers and/or glass, incorporated into the plastic material.
- Such an association between plastic material and consolidation material forms a composite material, capable of absorbing forces.
- the plastic material can for example be a reinforced polypropylene, a polypropylene, a polycarbonate, a polyamide or even a polycarbonate/polybutylene terephthalate (PBT) mixture.
- the consolidation material may in particular comprise fibers which extend along a longitudinal direction of the energy absorber device.
- the direction of elongation of the fibers is substantially perpendicular to a direction of the forces absorbed by the energy absorbing device during an impact suffered by the motor vehicle.
- the core and the at least one reinforcing piece have a sheet shape.
- the sheets respectively forming the core and the at least one reinforcing piece may be of substantially similar thicknesses.
- Such sheets are deformable, in particular by hot machining operations, so as to be able to assume a configuration optimized for shock absorption, and in particular a corrugated configuration. It is thus easier to give the core and the at least one reinforcement part a geometry of similar shape from one part to another.
- the core and the at least one reinforcement piece lie flat on top of each other and together have a geometry of common shape.
- the core has a geometry of sinusoidal shape.
- the core is deformed, for example by heating, so as to present an undulating shape with a succession of crests among which at least one depression and at least one elevation, arranged alternately along one of the dimensions of the soul.
- a sinusoidal geometry allows a regular and progressive crushing of the energy absorption device and thus a better absorption of forces during an impact.
- the at least one reinforcing piece is arranged overlapping at least one of the crests of the sinusoidal shape.
- the device has an external face intended to receive the shocks and an opposite internal face intended to be arranged facing the element to be protected, the sinusoidal shape of the core comprising an alternation of external peaks the apex of which participates in defining the external face and internal ridges the apex of which participates in defining the internal face, the at least one reinforcing piece being disposed overlapping one of the external ridges.
- the outer face and the inner face are disposed at opposite ends of the energy absorbing device. They can be discontinuous, hollow that can be formed between two neighboring peaks of external peaks or internal peaks.
- the at least one reinforcing piece comes to cover, at least in part, the end of the absorption device which is intended to receive the shocks, that is to say its external face.
- the at least one mechanical retaining element is arranged at a distance from the outer ridge, covering which is arranged the at least one reinforcing piece.
- the at least one mechanical retaining element makes it possible to secure the core and the at least one reinforcing piece and it has for this purpose a rigidity such that it is desired to move the mechanical retaining element away from the external face, and therefore the external ridges which participate in forming it, intended to receive the shocks. More particularly, this mechanical retaining element can be arranged in the vicinity of an internal ridge adjacent to the external ridge that the at least one reinforcing piece covers.
- the at least one reinforcement piece extends locally over the core from an internal crest to a neighboring internal crest, covering a single external crest.
- the at least one reinforcing piece has the shape of a plate, resting against the core of larger dimensions, the plate being deformed to present a sinusoidal geometry common to that of the core, and in which the at least one retaining element is arranged on the periphery of this plate forming a reinforcing piece.
- the reinforcing piece may in particular initially have a rectangular planar shape, which to present a sinusoidal geometry common to that of the core, is subsequently deformed by heating.
- the at least one reinforcement part and the core being intended to be joined together the energy absorber device comprises at least one mechanical retaining element which is here arranged on the periphery of the at least one reinforcement part .
- the term "periphery" means that this at least one retaining element is arranged in the vicinity of the contours or edges of this reinforcing piece.
- a central part of the plate forming the at least one reinforcing piece is arranged overlapping a outer crest of the geometry common to the core and to the at least one reinforcement part, said central part being devoid of mechanical retaining elements.
- the mechanical retaining element(s) are not arranged on the crest and do not form hard points which can be detrimental during an impact suffered by the vehicle, and in particular for the third-party vehicle brought to hit the vehicle.
- the central part of the at least one reinforcing piece must here be considered as a part disposed at a distance, along at least one direction of elongation of the sheet originally forming the reinforcing piece, from two edges of this piece reinforcement participating in forming the periphery thereof.
- This central part being arranged so as to cover an external crest of the sinusoidal geometry common to the core and to at least one reinforcing part, it is understood that the holding element(s) are arranged in the vicinity of the internal crests, so that the holding elements are as far as possible from the external face intended to undergo first the shock undergone by the energy absorbing device.
- reinforcing pieces are arranged at a distance from each other on the core, at least one mechanical retaining element being associated with each of the reinforcing pieces to keep it secured to the core independently of the other reinforcements.
- Each reinforcing piece is thus secured to the core by at least one mechanical holding element, such a mechanical holding element participating in the securing of a single reinforcing piece.
- the mechanical retaining element comprises a rivet.
- the rivet forming the mechanical holding element is chosen from a standard rivet, a blind rivet, an eyelet-type rivet or even a plywood rivet.
- rivets represent mechanical holding elements that are easy to implement, especially in a context where positioning on the periphery of the reinforcement part is desired, both to avoid the presence of these hard points at the level of the external face of the device. energy absorption only to allow effective maintenance of the sub-assembly formed by the core and the reinforcing part in the vicinity of the contours of this sub-assembly and to make it possible to avoid potential detachment before the overmoulding of the plastic structure.
- the plastic structure comprises means for fixing the energy absorbing device to an element of the vehicle which is to be protected.
- Such fixing means participate in securing the energy absorbing device to the vehicle that it is intended to equip.
- the core and the reinforcement piece also have fixing means, for example recesses or notches. These fixing means are adapted to receive fixing elements, which, by crossing both the core, the reinforcing part and the plastic structure, make it possible to fix the energy absorber device to the element of the vehicle that it is meant to protect. Such fixing occurs at the level of the internal face of the energy absorption device, which is the one facing the element to be protected.
- the invention further relates to a vehicle, in particular a motor vehicle, comprising at least one element to be protected from shocks and at least one energy-absorbing device as described above.
- Such an element to be protected can for example be a body of the vehicle or an electric battery thereof.
- the energy absorbing device is arranged opposite the element to be protected, so that its internal face is opposite this element to be protected while its external face intended to receive shocks is opposite it.
- the invention also covers a method for manufacturing an energy absorber device as described previously, during which: a sheet forming the core and at least one sheet forming locally on the core the at least one reinforcing part, the core and the at least one reinforcing part are mechanically assembled by mechanical holding elements, the assembly thus formed is deformed and overmoulded on this together deformed a plastic structure to form a one-piece assembly.
- Such an assembly therefore comprises a positioning step, an assembly step and a deformation step.
- the positioning step consists in placing the sheet forming the at least one reinforcement piece opposite the core, so as to locally cover this core and more precisely a portion of this core which it is desired to reinforce.
- the assembly step involves the mechanical retaining elements, for example rivets, which participate in securing the core and the at least one reinforcement part.
- the assembly thus formed is then deformed, for example by heating, and the plastic structure is molded onto this assembly in order to obtain the energy absorbing device according to the invention.
- the term “one-piece assembly” means that the assembly formed by the core and the at least one reinforcing part on the one hand and the plastic structure on the other hand cannot be separated without causing the deterioration of at least the one of these elements. In other words, the plastic structure cannot be separated from the core and from the at least one reinforcement part without one or the other being damaged.
- FIG. i illustrates, in a perspective view, an energy absorbing device according to the invention, comprising in particular a core, associated with a reinforcing piece and a plastic structure;
- FIG. 2 is a perspective view of a core and a reinforcement part of the energy absorber device of figure i, here shown without the plastic structure;
- FIG. 3 is an exploded view of the core and the reinforcement part of FIG. 2;
- FIG. 4 is a cross-sectional view of the assembly of the core and the reinforcement part of FIG. 2, showing, schematically, the mechanical retaining elements securing the core and the reinforcement part;
- FIG. 5 is a schematic representation of a method of manufacturing the energy absorbing device of Figure 1.
- the characteristics, variants and the different embodiments of the invention and which will in particular be described below, can be associated with each other, in various combinations, insofar as they are not incompatible or mutually exclusive. compared to others.
- variants of the invention may be imagined comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage and/or to differentiate the invention. compared to the prior art.
- a longitudinal direction corresponds to a main direction of elongation of this energy absorbing device, this longitudinal direction being parallel to a longitudinal axis L of a reference L, V, T illustrated in the figures.
- a vertical direction corresponds to a direction of attachment of the energy absorbing device to the vehicle that it is intended to equip, and in particular to the element to be protected from shocks, this vertical direction being parallel to a vertical axis V of the reference L, V, T and this vertical axis V being perpendicular to the longitudinal axis L.
- a transverse direction corresponds to a direction parallel to a transverse axis T of the reference L, V, T, this transverse axis T being perpendicular to the longitudinal axis L and the vertical axis V.
- FIG. 1 thus illustrates, schematically, an energy absorbing device 2 according to the invention, such an energy absorbing device 2 being intended to equip a vehicle, for example a motor vehicle.
- the energy absorber device 2 here comprises a core 4, at least one reinforcement piece 6 and a plastic structure 8.
- the energy absorbing device 2 is intended to protect the vehicle that it equips from the shocks and impacts that it could suffer. For this purpose, it is arranged opposite an element of the vehicle to be protected, not shown, such an element which may in particular be a body of the vehicle or an electric battery thereof.
- the energy absorbing device 2 extends mainly in a longitudinal direction and here it has a shape that is mainly part of a rectangular parallelepiped.
- the energy absorbing device 2 comprises an internal face 10 and an external face 12, opposite in a vertical direction, the internal face 10 being arranged at a first vertical end 14 of the energy absorbing device 2 while the external face 12 is arranged at a second vertical end 16. Internal face 10 and first vertical end 14 face the element to be protected, while external face 12 and second vertical end 16 are oriented so as to receive shocks.
- Core 4 is made of an energy absorbing material with impact resistant properties.
- Such an energy absorbing material can for example be a composite material, formed from a consolidation material and a plastic material.
- This consolidation material which is incorporated into the plastic material, may in particular comprise carbon and/or glass fibers locally reinforcing the core.
- the fibers can be arranged so as to have a common direction of elongation, and for example a direction parallel to the longitudinal direction in which the energy absorber device 2 mainly extends.
- the core 4 and the at least one reinforcing piece 6 have respectively, before any machining operation intended to deform them simultaneously, a form of sheet 18 and 20 as shown in FIG. 5.
- These sheets 18 and 20 are substantially planar and extend mainly in a longitudinal-transverse plane. They have a reduced thickness, such a thickness corresponding to their vertical dimension when they are flat as previously mentioned.
- the sheet 18 corresponding to the core 4 can for example have a thickness of 2.5 mm while the sheet 20 corresponding to at least one reinforcement piece 6 can have a thickness of about 1 mm.
- the sheet 18 forming the core 4 has at least one dimension, distinct from the thickness, which is greater than the corresponding dimension of the sheet 20 forming the at least one reinforcing piece 6. More particularly, the sheet 18 forming the core 4 has a transverse dimension greater than the corresponding transverse dimension of the sheet 20 forming the at least one reinforcing piece 6 and this sheet 18 forming the core 4 has a longitudinal dimension equal to the corresponding longitudinal dimension of the sheet 20 forming the at least one reinforcing piece 6.
- the core 4 and the at least one reinforcing piece 6 lie flat on top of each other and together have a geometry of common shape. It is understood here that the sheet 20 corresponding to the at least one reinforcing piece 6 is positioned on the sheet 18 corresponding to the core 4, covering it at least partially.
- the common shape geometry corresponds to a substantially planar geometry when the two parts rest on one another before deformation of this subassembly, and the common shape geometry corresponds to a wavy geometry when the two parts are one against the other after deformation of this subset.
- the sheet 18 corresponding to the core 4 and the sheet 20 corresponding to the at least one reinforcing piece 6 are intended to be made integral and to simultaneously undergo a deformation to form the energy absorbing device 2 , according to a manufacturing method which will be described below in relation to FIG.
- the core and the at least one reinforcing piece 6 are made integral by means of at least one mechanical holding element 22 according to the invention.
- the energy absorber device 2 may comprise a mechanical holding element 22 or several mechanical holding elements 22, as is the case in the figures.
- Such mechanical holding elements 22 can for example take the form of rivets, in particular standard rivets, blind rivets or even plywood rivets.
- the mechanical holding elements 22 are arranged on the energy absorbing device 2 according to a particular arrangement.
- the mechanical holding elements 22 are arranged on the periphery 24 of a rectangular plate, which represents the shape at the origin of the sheet forming the au at least one reinforcing piece 6, a central part 26 of this rectangular plate being on the contrary devoid of such mechanical retaining elements 22. It is understood that this periphery 24 corresponds to the contours or edges of the at least one reinforcing piece 6, while that the central part 26 is its portion which is at a distance from these contours or edges and is surrounded by them.
- the central part of the reinforcement piece extends away from the longitudinal edges, i.e. the edges of the reinforcement piece which extend perpendicularly to the transverse direction.
- the perforation of the core 4 and of the at least one reinforcement piece 6, necessary for their joining by mechanical retaining elements, can alternatively be carried out directly when the mechanical retaining elements 22 pass through their thickness when they are placed in place, or through orifices 27, visible in FIG. 5, formed beforehand in the thickness of this core 4 and of this at least one reinforcing piece 6.
- the core 4 and the at least one reinforcing piece 6 are deformed in order to take on a shape configured specifically to absorb shocks.
- the core is thus deformed to present a geometry of sinusoidal shape consisting of an alternation of crests in successive depression and elevation, as is particularly visible in FIGS. 2 to 4.
- Such a sinusoidal shape corresponds to an undulation of the thickness of the core 4 and it is oriented so that the amplitude of the sinusoidal shape, between two successive peaks, is oriented perpendicular to the outer face intended to receive the shocks, in order to promote progressive crushing of the shock absorber device energy 2 during an impact.
- the depressions correspond to internal crests 28 of the core 4, while the elevations correspond to external crests 30 of this core 4.
- the internal crests 28 are in the vicinity of the internal face 10 and the first vertical end 14, while the external peaks 30 are in the vicinity of the external face 12 and of the second vertical end 16. More particularly, the peaks 32 of the internal peaks 28 participate in defining the internal face 10 and the peaks 34 external ridges 30 participate in delimiting the external face 12. It is thus understood that when the energy absorbing device 2 is installed within the vehicle that it is intended to occupy, the internal ridges 28 are opposite the element to protect while the outer ridges 30 are intended to receive shocks.
- the at least one reinforcing piece 6 is arranged to overlap at least one of the crests of the sinusoidal shape of the core 4.
- the at least one reinforcing piece 6 thus forms a local extra thickness of the core 4, making it possible to reinforce its resistance to impacts. More particularly and as visible in particular in FIGS. 2 to 4, the at least one reinforcing piece 6 covers a single outer crest 30 of the core 4.
- the at least one reinforcing piece 6 then has a section in the shape of a U, seen in a plane perpendicular to the longitudinal direction of the web.
- the mechanical retaining elements 22 are arranged at a distance from the outer ridge 30 which is covered by the at least one reinforcement part 6. These mechanical retaining elements 22 can for example be arranged in the vicinity of the internal ridges 28 adjacent to the outer ridge 30 covered.
- the central part 26 of the rectangular plate which forms the at least one reinforcement part 6 being devoid of mechanical retaining elements 22, it is understood that these mechanical retaining elements 22 are located on the internal face 10 rather than on the face outer ridge 12 and that the top 34 of the covered outer ridge 30, such a top 34 participating in forming this outer face 12, is also devoid of mechanical retaining elements 22.
- at least one reinforcement piece 6 can cover several successive outer ridges 30 .
- the mechanical retaining elements 22 could be arranged in the vicinity of the two internal crests 28 each located at a transverse end 36 or 38 of the at least one reinforcing piece 6, or even in the vicinity of each internal crest 28 covered by at least one reinforcing piece 6.
- each of the reinforcing parts 6 is in this case made integral with the core by means of one or more mechanical retaining elements 22 which are specific to it, independently of the mechanical retaining elements used for fixing the other parts. reinforcement 6.
- An energy absorber device 2 according to the invention can be obtained following a manufacturing process illustrated in FIG. 5.
- Such a manufacturing process may comprise at least three steps, among which a positioning step, a assembly step and a deformation step.
- the positioning step corresponds to the relative positioning of the sheet 18 forming the core 4 and of at least one sheet 20 forming locally on this core 4 the at least one reinforcing piece 6. Such positioning is facilitated by a configuration initial of the core and of the reinforcement piece in the form of flat and rectangular sheets, of small thickness and extending in this initial configuration in two dimensions, except for the thickness.
- the sheet 20 forming the reinforcement piece is positioned so as to overlap a portion of the sheet 18 forming the core intended to become an outer crest of the corrugated shape of the core after deformation.
- the core 4 and the at least one reinforcement piece 6 are then pierced with holes 27 capable of receiving the mechanical retaining elements 22.
- This drilling operation forms a sub-step of the assembly step, which continues by the insertion of the mechanical holding elements 22 into the previously formed orifices.
- the orifices 27, and consequently the mechanical retaining elements 22, for example rivets, are arranged on the periphery 24 of the rectangular plate which forms the at least one reinforcing piece 6, the mechanical retaining elements being deformed at the using a suitable machine to irreversibly maintain the core and the reinforcement piece.
- the assembly thus produced of the core 4 and of the at least one reinforcement piece 6 then undergoes a deformation step, during which the sheets 18 and 20 are deformed so as to present a geometry of common sinusoidal shape.
- a deformation step can for example comprise a prior heating operation 37, to a temperature sufficient to make the energy absorbing material malleable, followed by a transfer within a mold 39 in which the core 4 and the at least one reinforcing piece 6 are thermoformed during a forming operation 41.
- the core 4 has the internal and external ridges described previously and the at least one reinforcing piece is formed on one external ridges, with the central part 26 of the at least one reinforcement part 6 which covers this external ridge 30 is devoid of mechanical retaining elements 22.
- the plastic material forming the plastic structure 8 is then injected into the mold 39 during a molding step 43 and this plastic structure 8 is molded onto the assembly formed by the core 4 and the at least one reinforcing piece 6.
- a one-piece assembly is then obtained which corresponds to the absorption device of energy 2, it being understood that the assembly formed by the core 4 and the at least one reinforcing piece 6 on the one hand and the plastic structure 8 on the other hand can no longer be separated without causing deterioration of the one or the other. It is understood that within this one-piece assembly, the at least one reinforcing piece 6 is inserted between the core 4 and the plastic structure 8, as illustrated in figure 1.
- the energy absorber device 2 thus formed can then be fixed to the vehicle which it is intended to be fitted by means of fixing means 40, particularly visible in FIG. 1.
- fixing means here tubes capable of being traversed by clamping screws, make it possible to fix the energy absorbing device 2 to the element to be protected of this vehicle.
- These fixing means 40 are, when the plastic structure 8 covers both the core 4 and the at least one reinforcing piece 6, facing complementary fixing means 42 and 44 formed on this core 4 and this at least a reinforcing piece 6 respectively. As illustrated in FIG.
- these complementary fixing means 42 and 44 can take the form of through-holes, as is the case for the complementary fixing means 42 carried by the core 4, or even openings opening onto a longitudinal edge as is the case for the complementary fixing means 44 carried by the at least one reinforcing piece 6.
- These fixing elements pass right through the energy absorber device 2 in the vertical direction, that is to say from its external face 12 to its internal face 10.
- the Fastening elements are inserted both through the plastic structure 8, the at least one reinforcing piece 6 and the core 4, so as to be engaged in the element to be protected of the vehicle.
- the present invention thus proposes an energy absorbing device in which a part made of composite material and a reinforcing part are secured to one another by one or more mechanical retaining elements, facilitating the holding of this sub- together during the manufacturing operation of the energy absorbing device, regardless of the type of material chosen for the composite material part and the reinforcing part.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Vibration Dampers (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2110559A FR3127741A1 (fr) | 2021-10-06 | 2021-10-06 | Dispositif d’absorption d’energie |
| PCT/EP2022/074527 WO2023057142A1 (fr) | 2021-10-06 | 2022-09-02 | Dispositif d'absorption d'energie |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4413280A1 true EP4413280A1 (fr) | 2024-08-14 |
Family
ID=78483402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22772526.4A Pending EP4413280A1 (fr) | 2021-10-06 | 2022-09-02 | Dispositif d'absorption d'energie |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250237282A1 (fr) |
| EP (1) | EP4413280A1 (fr) |
| CN (1) | CN118076816A (fr) |
| FR (1) | FR3127741A1 (fr) |
| WO (1) | WO2023057142A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0863056A1 (fr) * | 1997-03-03 | 1998-09-09 | General Motors Corporation | Structure d'absorption d'énergie |
| US9758193B2 (en) * | 2015-02-10 | 2017-09-12 | Honda Motor Co., Ltd. | Structural reinforcement member for a vehicle body |
| FR3056145B1 (fr) * | 2016-09-16 | 2018-10-26 | Plastic Omnium Cie | Procede de fabrication ameliore d'une piece de structure hybride de vehicule automobile et piece de structure hybride correspondante |
| US10788091B2 (en) * | 2017-08-22 | 2020-09-29 | Oakwood Energy Management, Inc. | Mass-optimized force attenuation system and method |
| CN110901775A (zh) * | 2018-09-14 | 2020-03-24 | 福特全球技术公司 | 用于机动车辆的组件以及制造用于机动车辆的组件的方法 |
-
2021
- 2021-10-06 FR FR2110559A patent/FR3127741A1/fr active Pending
-
2022
- 2022-09-02 US US18/698,363 patent/US20250237282A1/en active Pending
- 2022-09-02 CN CN202280067194.XA patent/CN118076816A/zh active Pending
- 2022-09-02 WO PCT/EP2022/074527 patent/WO2023057142A1/fr not_active Ceased
- 2022-09-02 EP EP22772526.4A patent/EP4413280A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20250237282A1 (en) | 2025-07-24 |
| FR3127741A1 (fr) | 2023-04-07 |
| CN118076816A (zh) | 2024-05-24 |
| WO2023057142A1 (fr) | 2023-04-13 |
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