EP4259490A1 - Assembly for absorbing impact energy - Google Patents
Assembly for absorbing impact energyInfo
- Publication number
- EP4259490A1 EP4259490A1 EP21823888.9A EP21823888A EP4259490A1 EP 4259490 A1 EP4259490 A1 EP 4259490A1 EP 21823888 A EP21823888 A EP 21823888A EP 4259490 A1 EP4259490 A1 EP 4259490A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insert
- plastic material
- assembly according
- notch
- plastic
- 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
- 239000000463 material Substances 0.000 claims abstract description 42
- 229920003023 plastic Polymers 0.000 claims abstract description 37
- 239000004033 plastic Substances 0.000 claims abstract description 37
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 239000012763 reinforcing filler Substances 0.000 claims abstract description 7
- 238000003856 thermoforming Methods 0.000 claims abstract description 3
- 238000003466 welding Methods 0.000 claims abstract description 3
- 239000006096 absorbing agent Substances 0.000 claims description 20
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 description 8
- 229920000515 polycarbonate Polymers 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- 230000035939 shock Effects 0.000 description 7
- 239000004952 Polyamide Substances 0.000 description 6
- -1 Polypropylene Polymers 0.000 description 6
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 229920002647 polyamide Polymers 0.000 description 6
- 229920001707 polybutylene terephthalate Polymers 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 229920006778 PC/PBT Polymers 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
- B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/03—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by material, e.g. composite
-
- 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
- F16F7/003—One-shot shock absorbers
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3044—Bumpers
-
- 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]
-
- 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
- F16F2226/042—Gluing
-
- 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
- F16F2226/048—Welding
-
- 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
- F16F2236/00—Mode of stressing of basic spring or damper elements or devices incorporating such elements
- F16F2236/04—Compression
Definitions
- the present invention relates to a shock energy absorber assembly capable of providing protection in the event of an impact, in particular frontal impact, on a motor vehicle.
- the present invention aims in particular to improve a shock energy absorber assembly suitable for providing protection in the event of an impact, in particular frontal, on a motor vehicle.
- the subject of the present invention is thus an impact energy absorber assembly, comprising a bumper beam and at least one energy absorber device, interposed between this bumper beam and a side member of a motor vehicle, this energy absorber device, also called crashbox in English, comprising a body comprising a plastic material and at least one insert made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert .
- the plastic body and the composite inserts are linked in particular by overmolding a material of the same type or compatible.
- the insert preferably comprises a zone of mechanical weakness arranged to promote the onset of breakage of the energy absorber device.
- the invention thus makes it possible to absorb, in particular in the event of a frontal impact, the maximum impact energy over the entire stroke of the impact without however reaching a peak of force so as not to damage the part of the vehicle. behind the bumper. Thus repair costs can be reduced in the event of an accident and impact.
- the weak zone on the insert comprises a notch made on the insert.
- the notch is empty. In other words, this notch corresponds to a hole in the insert.
- the notch receives a filling material, in particular a plastic material.
- This filling material is for example the same as that of overmolding, in particular to be compatible with the composite material.
- This material is for example PP, PA6, PC, PBT.
- the filling material is different from the material of the rest of the insert.
- the thickness of the filling material is less than the thickness of the insert.
- the notch has a round, polygonal or curved shape.
- each insert has a single weak zone.
- each insert has a plurality of areas of weakness, in particular a plurality of notches.
- the notch has an elongated shape.
- the insert is formed from a sheet of composite material.
- the reinforcing filler of the insert comprises glass fibres.
- the filling material of the notch can be the same as the plastic material of the body.
- the body has reinforcing ribs, in particular made by molding the plastic material.
- a plurality of inserts are provided on the body.
- the number of inserts on each body is chosen between 2 and 10, for example between 2 and 6, being for example equal to 6.
- each insert is arranged between two reinforcing ribs of the body.
- the insert or inserts are arranged on the surface of the body of the energy absorber device.
- the body has a perimeter, and the insert extends over only one sector of this perimeter.
- the insert is not a coiled strip with its two ends joined.
- Another subject of the invention is an energy absorber device comprising a body comprising a plastic material and at least one insert made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert , the plastic body and the composite insert being bonded in particular by welding, gluing, thermoforming.
- the plastic material mentioned above can be Polypropylene (PP), High density polyethylene (HDPE), Polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC/PBT), polycarbonate (PC), an Acrylate, a Polyurethane, a thermoplastic (TPU).
- PP Polypropylene
- HDPE High density polyethylene
- PA Polyamide
- PC/PBT Polyamide
- PC polycarbonate
- Acrylate a Polyurethane
- TPU thermoplastic
- FIG.1 is a schematic view of an assembly according to an example of the invention.
- FIG.2 schematically and partially represents a detail of the assembly according to figure 1.
- Motor vehicles are generally equipped with a bumper beam 2 arranged on the front face. As shown in Figure 1, this bumper beam 2 can be attached to two longitudinal members 3 of the vehicle. In order to absorb the shocks and to prevent the energy of the shocks from being directly transmitted to the longitudinal members 3 as well as to the rest of the vehicle, the bumper beam 2 is fixed to energy absorber devices 1 which form the connection between the bumper beam 2 and the ends of the longitudinal members 3 which face said bumper beam 2.
- a shock energy absorber assembly 10 comprising the bumper beam 2 and, at two locations of the bumper 2, the two energy absorber devices 1, each interposed between this bumper beam 2 and the associated spar 3.
- Each energy absorber device 1, also called crashbox in English comprises a body 11 comprising a plastic material and inserts 12 made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert.
- the inserts 12 comprise, for example, carbon and/or glass fibers, this reinforcing material being incorporated into the plastic material.
- This plastic material can be Polypropylene (PP), High Density Polyethylene (HDPE), Polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC/PBT), polycarbonate (PC), an Acrylate, a Polyurethane, a thermoplastic ( TPU).
- the inserts 12 are formed from a sheet.
- the body 1 1 is made of plastic material which can be polypropylene (PP), high density polyethylene (HDPE), polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC / PBT), polycarbonate (PC) , an Acrylate, a Polyurethane, a thermoplastic (TPU).
- plastic material which can be polypropylene (PP), high density polyethylene (HDPE), polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC / PBT), polycarbonate (PC) , an Acrylate, a Polyurethane, a thermoplastic (TPU).
- the plastic body 11 is molded over the inserts 12.
- the plastic used for the molding is of the same nature or chemically compatible with the resin which impregnates the composite material of the inserts so that strong adhesion is ensured between the body 11 and the inserts 12.
- the body 1 1 comprises a plate 13 made in one piece with the rest of the body 1 1 for fixing on the spar 3.
- This plate 13 has holes 14 for fastening means such as screws on the spar 3 .
- Each insert 12 comprises one or more areas of mechanical weakness 15 arranged to promote the onset of breakage of the energy absorber device 1 .
- Each zone of weakness 15 on the insert has a notch 16 made on the insert.
- the notches 16 of the areas 15 are empty. In other words, each notch 16 corresponds to a hole in the insert.
- the notch 16 receives a filling material, in particular a plastic material.
- the filling material is different from the material of the rest of insert 12.
- the thickness of the filling material is less than the thickness of the insert 12.
- Each notch 16 has a round shape, polygonal or any curve.
- One of the inserts may have a single weak zone 15 or a plurality of weak zones 15, thus formed by a plurality of notches. This number can be two, three or more.
- the notch 16 has a slender shape.
- Each insert 12 is formed from a sheet of composite material.
- Each body 11 has reinforcing ribs 19 made by molding the plastic material. These ribs 19 can be arranged in a cross, or other pattern.
- the number of inserts on each body is chosen between 2 and 10, for example between 2 and 6, being for example equal to 6.
- each insert 12 is arranged between two reinforcing ribs 19 of the body 11, as can be seen for example in Figure 2.
- Each insert 12 is arranged on the surface of the body 11 of the energy absorber device, resting on ribs 19 which are located under this insert 12.
- the plastic body 11 has a perimeter 18, and each insert 12 extends over only one sector of this perimeter 18.
- the insert 12 is not a rolled up strip with its two ends which are joined .
- the inserts 12 may all be identical or, alternatively, be different so that the inserts 12 are of different shapes, possibly with a number of areas of weakness which varies from one insert to another.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vibration Dampers (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention relates to an assembly (10) for absorbing impact energy, comprising a bumper beam and at least one energy absorbing device (1), interposed between this bumper beam (2) and a side member (3) of a motor vehicle, this energy absorbing device, also referred to as a crashbox, comprising a body comprising a plastic material and at least one insert (12) made from composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert, the plastic body and the composite insert being connected in particular by welding, bonding, thermoforming, the insert comprising a region of mechanical weakness (15) arranged to help initiate the breaking of the absorbing device.
Description
TITRE ENSEMBLE ABSORBEUR D’ENERGIE DE CHOC TITLE SHOCK ENERGY ABSORBING ASSEMBLY
[1 ] La présente invention concerne un ensemble absorbeur d’énergie de choc propre à assurer une protection en cas de choc notamment frontal sur un véhicule automobile. [1] The present invention relates to a shock energy absorber assembly capable of providing protection in the event of an impact, in particular frontal impact, on a motor vehicle.
[2] Afin d'absorber l'énergie d'un choc notamment frontal au niveau d'une poutre pare- chocs d'un véhicule automobile, il est connu d'utiliser des dispositifs absorbeur d'énergie qui se déforment du fait des forces exercées par le choc. Ces dispositifs absorbeur d'énergie sont généralement réalisés en matériau métallique du fait de leur résistance. Cependant, ces dispositifs absorbeur d'énergie métalliques sont lourds et ne vont pas dans le sens de l'évolution des véhicules automobiles qui cherchent à réduire de plus en plus leur poids. [2] In order to absorb the energy of an impact, in particular a frontal impact, at the level of a bumper beam of a motor vehicle, it is known to use energy-absorbing devices which deform due to the forces exerted by shock. These energy absorber devices are generally made of metallic material because of their resistance. However, these metallic energy-absorbing devices are heavy and do not go in the direction of the evolution of motor vehicles which seek to reduce their weight more and more.
[3] La présente invention vise notamment à améliorer un ensemble absorbeur d’énergie de choc propre à assurer une protection en cas de choc notamment frontal sur un véhicule automobile. [3] The present invention aims in particular to improve a shock energy absorber assembly suitable for providing protection in the event of an impact, in particular frontal, on a motor vehicle.
[4] La présente invention a ainsi pour objet un ensemble absorbeur d’énergie de choc, comprenant une poutre de pare-chocs et au moins un dispositif absorbeur d'énergie, interposé entre cette poutre de pare-chocs et un longeron d’un véhicule automobile, ce dispositif absorbeur d'énergie, encore appelé crashbox en anglais , comportant un corps comportant une matière plastique et au moins un insert réalisé en matériau composite comprenant une matière plastique et une charge de renfort noyée dans cette matière plastique de l’insert. [4] The subject of the present invention is thus an impact energy absorber assembly, comprising a bumper beam and at least one energy absorber device, interposed between this bumper beam and a side member of a motor vehicle, this energy absorber device, also called crashbox in English, comprising a body comprising a plastic material and at least one insert made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert .
[5] Par exemple le corps en plastique et les inserts en composite sont liés notamment par surmoulage d'une matière de même nature ou compatible. [5] For example, the plastic body and the composite inserts are linked in particular by overmolding a material of the same type or compatible.
[6] L’insert comprend de préférence une zone de faiblesse mécanique agencée pour favoriser une amorce de cassure du dispositif absorbeur d'énergie. [6] The insert preferably comprises a zone of mechanical weakness arranged to promote the onset of breakage of the energy absorber device.
[7] L’invention permet ainsi d’absorber, notamment en cas de choc frontal, le maximum d’énergie de choc sur toute la course du choc sans pour autant atteindre un pic de force de sorte à ne pas endommager la partie du véhicule derrière le pare-chocs. Ainsi les coûts de réparation peuvent être réduits en cas d’accident et de choc. [7] The invention thus makes it possible to absorb, in particular in the event of a frontal impact, the maximum impact energy over the entire stroke of the impact without however reaching a peak of force so as not to damage the part of the vehicle. behind the bumper. Thus repair costs can be reduced in the event of an accident and impact.
[8] La présence d’une zone de faiblesse permet, en agissant comme un initiateur de cassure, d’éviter/réduire le pic de force qui pourrait se produire en cas de choc accidentel. [8] The presence of a zone of weakness makes it possible, by acting as a break initiator, to avoid/reduce the peak of force that could occur in the event of an accidental impact.
[9] La mise en oeuvre de l’invention n’induit pas de coût supplémentaire, et est facilement réalisable dans une usine de production. [9] The implementation of the invention does not incur any additional cost, and is easily achievable in a production plant.
[10] Selon l’un des aspects de l’invention, la zone de faiblesse sur l’insert comporte une encoche réalisée sur l’insert.
[11] Selon l’un des aspects de l’invention, l’encoche est vide. Autrement dit cette encoche correspond à un trou dans l’insert. [10] According to one aspect of the invention, the weak zone on the insert comprises a notch made on the insert. [11] According to one aspect of the invention, the notch is empty. In other words, this notch corresponds to a hole in the insert.
[12] Selon l’un des aspects de l’invention, l’encoche reçoit un matériau de remplissage, notamment un matériau plastique. [12] According to one of the aspects of the invention, the notch receives a filling material, in particular a plastic material.
[13] Ce matériau de remplissage est par exemple le même que celui de surmoulage, notamment être compatible avec la matière composite. Ce matériau est par exemple du PP, PA6, PC, PBT. [13] This filling material is for example the same as that of overmolding, in particular to be compatible with the composite material. This material is for example PP, PA6, PC, PBT.
[14] Selon l’un des aspects de l’invention, le matériau de remplissage est différent du matériau du reste de l’insert. [14] According to one aspect of the invention, the filling material is different from the material of the rest of the insert.
[15] Selon l’un des aspects de l’invention, l’épaisseur du matériau de remplissage est inférieure à l’épaisseur de l’insert. [15] According to one aspect of the invention, the thickness of the filling material is less than the thickness of the insert.
[16] Selon l’un des aspects de l’invention, l’encoche présente une forme ronde, polygonale ou courbe quelconque. [16] According to one aspect of the invention, the notch has a round, polygonal or curved shape.
[17] Selon l’un des aspects de l’invention, chaque insert présente une seule zone de faiblesse. [17] According to one of the aspects of the invention, each insert has a single weak zone.
[18] En variante, chaque insert présente une pluralité de zones de faiblesse, notamment une pluralité d’encoches. [18] Alternatively, each insert has a plurality of areas of weakness, in particular a plurality of notches.
[19] Par exemple l’encoche présente une forme longiligne. [19] For example, the notch has an elongated shape.
[20] Selon l’un des aspects de l’invention, l’insert est formé à partir d’une feuille en matériau composite. [20] According to one aspect of the invention, the insert is formed from a sheet of composite material.
[21] Selon l’un des aspects de l’invention, la charge de renfort de l’insert comporte des fibres de verre. [21] According to one of the aspects of the invention, the reinforcing filler of the insert comprises glass fibres.
[22] Selon l’un des aspects de l’invention, le matériau de remplissage de l’encoche peut être le même que le matériau plastique du corps. [22] According to one of the aspects of the invention, the filling material of the notch can be the same as the plastic material of the body.
[23] Selon l’un des aspects de l’invention, le corps comporte des nervures de renfort, notamment réalisées par moulage de la matière plastique. [23] According to one of the aspects of the invention, the body has reinforcing ribs, in particular made by molding the plastic material.
[24] Selon l’un des aspects de l’invention, une pluralité d’inserts sont prévue sur le corps. [24] According to one aspect of the invention, a plurality of inserts are provided on the body.
[25] Selon l’un des aspects de l’invention, le nombre d’inserts sur chaque corps est choisi entre 2 et 10, par exemple entre 2 et 6, étant par exemple égal à 6. [25] According to one of the aspects of the invention, the number of inserts on each body is chosen between 2 and 10, for example between 2 and 6, being for example equal to 6.
[26] En variante, un seul insert est prévu sur chaque corps.
[27] Selon l’un des aspects de l’invention, chaque insert est disposé entre deux nervures de renfort du corps. [26] Alternatively, a single insert is provided on each body. [27] According to one aspect of the invention, each insert is arranged between two reinforcing ribs of the body.
[28] Selon l’un des aspects de l’invention, le ou les inserts sont disposés en surface du corps du dispositif absorbeur d'énergie. [28] According to one of the aspects of the invention, the insert or inserts are arranged on the surface of the body of the energy absorber device.
[29] Selon l’un des aspects de l’invention, le corps présente un pourtour, et l’insert s’étend sur un secteur seulement de ce pourtour. Autrement dit, l’insert n’est pas une bande enroulée avec ses deux extrémités qui sont jointes. [29] According to one of the aspects of the invention, the body has a perimeter, and the insert extends over only one sector of this perimeter. In other words, the insert is not a coiled strip with its two ends joined.
[30] L’invention a encore pour objet un dispositif absorbeur d'énergie comportant un corps comportant une matière plastique et au moins un insert réalisé en matériau composite comprenant une matière plastique et une charge de renfort noyée dans cette matière plastique de l’insert, le corps en plastique et l’insert en composite étant liés notamment par soudage, collage, thermoformage. [30] Another subject of the invention is an energy absorber device comprising a body comprising a plastic material and at least one insert made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert , the plastic body and the composite insert being bonded in particular by welding, gluing, thermoforming.
[31] La matière plastique citée plus haut peut être du Polypropylène (PP), Polyéthylène haute densité (PEHD), Polyamide (PA), un alliage de polycarbonate polytéréphtalate de butylène (PC/PBT), polycarbonate (PC), un Acrylate, une Polyuréthane, une thermoplastique (TPU). [31] The plastic material mentioned above can be Polypropylene (PP), High density polyethylene (HDPE), Polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC/PBT), polycarbonate (PC), an Acrylate, a Polyurethane, a thermoplastic (TPU).
[32] D'autres caractéristiques, détails et avantages de l'invention ressortiront plus clairement à la lecture de la description détaillée donnée ci-après, et de plusieurs exemples de réalisation donnés à titre indicatif et non limitatif en référence aux dessins schématiques annexés d’autre part, sur lesquels : [32] Other characteristics, details and advantages of the invention will emerge more clearly on reading the detailed description given below, and several embodiments given by way of indication and not limitation with reference to the appended schematic drawings of on the other hand, on which:
[33] [Fig.1 ] est une vue schématique d’un ensemble selon un exemple de l’invention,[33] [Fig.1] is a schematic view of an assembly according to an example of the invention,
[34] [Fig.2] représente schématiquement et partiellement un détail de l’ensemble selon la figure 1. [34] [Fig.2] schematically and partially represents a detail of the assembly according to figure 1.
[35] Les véhicules automobiles sont généralement munis d'une poutre pare-chocs 2 disposée en face avant. Comme le montre la figure 1 , cette poutre pare-chocs 2 peut être fixée à deux longerons 3 du véhicule. Afin d'absorber les chocs et d'éviter que l'énergie des chocs ne soit directement transmise aux longerons 3 ainsi qu’au reste du véhicule, la poutre pare- chocs 2 est fixée à des dispositifs absorbeur d'énergie 1 qui font la liaison entre la poutre pare- chocs 2 et les extrémités des longerons 3 qui sont en regards de ladite poutre pare-chocs 2. [35] Motor vehicles are generally equipped with a bumper beam 2 arranged on the front face. As shown in Figure 1, this bumper beam 2 can be attached to two longitudinal members 3 of the vehicle. In order to absorb the shocks and to prevent the energy of the shocks from being directly transmitted to the longitudinal members 3 as well as to the rest of the vehicle, the bumper beam 2 is fixed to energy absorber devices 1 which form the connection between the bumper beam 2 and the ends of the longitudinal members 3 which face said bumper beam 2.
[36] On voit sur la figure 1 un ensemble 10 absorbeur d’énergie de choc, comprenant la poutre de pare-chocs 2 et, à deux emplacements du pare-chocs 2, les deux dispositifs absorbeur d'énergie 1 , interposés chacun entre cette poutre de pare-chocs 2 et le longeron 3 associé.
[37] Chaque dispositif absorbeur d'énergie 1 , encore appelé crashbox en anglais, comporte un corps 11 comportant une matière plastique et des inserts 12 réalisés en matériau composite comprenant une matière plastique et une charge de renfort noyée dans cette matière plastique de l’insert. [36] We see in Figure 1 a shock energy absorber assembly 10, comprising the bumper beam 2 and, at two locations of the bumper 2, the two energy absorber devices 1, each interposed between this bumper beam 2 and the associated spar 3. [37] Each energy absorber device 1, also called crashbox in English, comprises a body 11 comprising a plastic material and inserts 12 made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert.
[38] Les inserts 12 comporte par exemple des fibres de carbone et/ou de verre, ce matériau de renfort étant incorporé dans la matière plastique. Cette matière plastique peut être du Polypropylène (PP), Polyéthylène haute densité (PEHD), Polyamide (PA), un alliage de polycarbonate polytéréphtalate de butylène (PC/PBT), polycarbonate (PC), un Acrylate, une Polyuréthane, une thermoplastique (TPU). [38] The inserts 12 comprise, for example, carbon and/or glass fibers, this reinforcing material being incorporated into the plastic material. This plastic material can be Polypropylene (PP), High Density Polyethylene (HDPE), Polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC/PBT), polycarbonate (PC), an Acrylate, a Polyurethane, a thermoplastic ( TPU).
[39] Les inserts 12 sont formés à partir d’une feuille. [39] The inserts 12 are formed from a sheet.
[40] Le corps 1 1 est fabriqué en matière plastique qui peut être du Polypropylène (PP), Polyéthylène haute densité (PEHD), Polyamide (PA), un alliage de polycarbonate polytéréphtalate de butylène (PC/PBT), polycarbonate (PC), un Acrylate, une Polyuréthane, une thermoplastique (TPU). [40] The body 1 1 is made of plastic material which can be polypropylene (PP), high density polyethylene (HDPE), polyamide (PA), an alloy of polycarbonate polybutylene terephthalate (PC / PBT), polycarbonate (PC) , an Acrylate, a Polyurethane, a thermoplastic (TPU).
[41] Le corps 1 1 en plastique est surmoulé sur les inserts 12. Le plastique employé pour le surmoulage est de même nature ou chimiquement compatible avec la résine qui imprègne le matériau composite des inserts de sorte à ce qu'une adhésion forte soit assurée entre le corps 1 1 et les inserts 12. [41] The plastic body 11 is molded over the inserts 12. The plastic used for the molding is of the same nature or chemically compatible with the resin which impregnates the composite material of the inserts so that strong adhesion is ensured between the body 11 and the inserts 12.
[42] Le corps 1 1 comporte une platine 13 réalisée d’un seul tenant avec le reste du corps 1 1 pour la fixation sur le longeron 3. Cette platine 13 comporte des trous14 pour de moyens de fixation tels des vis sur le longeron 3. [42] The body 1 1 comprises a plate 13 made in one piece with the rest of the body 1 1 for fixing on the spar 3. This plate 13 has holes 14 for fastening means such as screws on the spar 3 .
[43] Chaque insert 12 comprend une ou plusieurs zones de faiblesse mécanique 15 agencées pour favoriser une amorce de cassure du dispositif absorbeur d'énergie 1 . [43] Each insert 12 comprises one or more areas of mechanical weakness 15 arranged to promote the onset of breakage of the energy absorber device 1 .
[44] Chaque zone de faiblesse 15 sur l’insert comporte une encoche 16 réalisée sur l’insert. [44] Each zone of weakness 15 on the insert has a notch 16 made on the insert.
[45] Dans l’exemple décrit, les encoche 16 des zones 15 sont vides. Autrement dit chaque encoche 16 correspond à un trou dans l’insert. [45] In the example described, the notches 16 of the areas 15 are empty. In other words, each notch 16 corresponds to a hole in the insert.
[46] Dans une variante, l’encoche 16 reçoit un matériau de remplissage, notamment un matériau plastique. [46] Alternatively, the notch 16 receives a filling material, in particular a plastic material.
[47] Le matériau de remplissage est différent du matériau du reste de l’insert 12. [47] The filling material is different from the material of the rest of insert 12.
[48] L’épaisseur du matériau de remplissage est inférieure à l’épaisseur de l’insert 12. [48] The thickness of the filling material is less than the thickness of the insert 12.
[49] Chaque encoche 16 présente une forme ronde, polygonale ou courbe quelconque.
[50] L’un des inserts peut présenter une seule zone de faiblesse 15 ou une pluralité de zones de faiblesse 15, formées ainsi par une pluralité d’encoches. Ce nombre peut être de deux, trois ou plus. [49] Each notch 16 has a round shape, polygonal or any curve. [50] One of the inserts may have a single weak zone 15 or a plurality of weak zones 15, thus formed by a plurality of notches. This number can be two, three or more.
[51 ] Sur la figure 2, l’insert 12 visible ne comporte qu’une zone de faiblesse 15. [51] In Figure 2, the visible insert 12 has only one weak zone 15.
[52] Par exemple l’encoche 16 présente une forme longiligne. [52] For example the notch 16 has a slender shape.
[53] Chaque insert 12 est formé à partir d’une feuille en matériau composite. [53] Each insert 12 is formed from a sheet of composite material.
[54] Chaque corps 11 comporte des nervures de renfort 19 réalisées par moulage de la matière plastique. Ces nervures 19 peuvent être disposés en croix, ou autre motif. [54] Each body 11 has reinforcing ribs 19 made by molding the plastic material. These ribs 19 can be arranged in a cross, or other pattern.
[55] Le nombre d’inserts sur chaque corps est choisi entre 2 et 10, par exemple entre 2 et 6, étant par exemple égal à 6. [55] The number of inserts on each body is chosen between 2 and 10, for example between 2 and 6, being for example equal to 6.
[56] Par exemple chaque insert 12 est disposé entre deux nervures de renfort 19 du corps 11 , comme on peut le voir par exemple sur la figure 2. [56] For example each insert 12 is arranged between two reinforcing ribs 19 of the body 11, as can be seen for example in Figure 2.
[57] Chaque inserts 12 est disposé en surface du corps 11 du dispositif absorbeur d’énergie, en appui sur des nervure 19 qui se trouvent sous cet insert 12. [57] Each insert 12 is arranged on the surface of the body 11 of the energy absorber device, resting on ribs 19 which are located under this insert 12.
[58] Le corps 11 en plastique présente un pourtour 18, et chaque insert 12 s’étend sur un secteur seulement de ce pourtour 18. Autrement dit, l’insert 12 n’est pas une bande enroulée avec ses deux extrémités qui sont jointes. [58] The plastic body 11 has a perimeter 18, and each insert 12 extends over only one sector of this perimeter 18. In other words, the insert 12 is not a rolled up strip with its two ends which are joined .
[59] Les inserts 12 peuvent être tous identiques ou, en variante, être différents de sorte que des inserts 12 sont de formes différentes, avec éventuellement un nombre de zones de faiblesse qui varie d’un insert à l’autre.
[59] The inserts 12 may all be identical or, alternatively, be different so that the inserts 12 are of different shapes, possibly with a number of areas of weakness which varies from one insert to another.
Claims
[Revendication 1 ] Ensemble (10) absorbeur d’énergie de choc, comprenant une poutre de pare-chocs et au moins un dispositif absorbeur d'énergie (1 ), interposé entre cette poutre de pare-chocs (2) et un longeron (3) d’un véhicule automobile, ce dispositif absorbeur d'énergie, encore appelé crashbox en anglais , comportant un corps comportant une matière plastique et au moins un insert (12) réalisé en matériau composite comprenant une matière plastique et une charge de renfort noyée dans cette matière plastique de l’insert, le corps en plastique et l’insert en composite étant liés, l’insert comprenant une zone de faiblesse mécanique (15) agencée pour favoriser une amorce de cassure du dispositif absorbeur. [Claim 1] Impact energy absorber assembly (10), comprising a bumper beam and at least one energy absorber device (1), interposed between this bumper beam (2) and a side member ( 3) of a motor vehicle, this energy absorber device, also called a crashbox in English, comprising a body comprising a plastic material and at least one insert (12) made of a composite material comprising a plastic material and an embedded reinforcing filler in this plastic material of the insert, the plastic body and the composite insert being bonded, the insert comprising a zone of mechanical weakness (15) arranged to promote the onset of breakage of the absorber device.
[Revendication 2] Ensemble selon la revendication précédente, dans lequel la zone de faiblesse (15) sur l’insert comporte une encoche (16) réalisée sur l’insert. [Claim 2] Assembly according to the preceding claim, in which the zone of weakness (15) on the insert comprises a notch (16) made on the insert.
[Revendication 3] Ensemble selon la revendication précédente, dans lequel l’encoche (16) est vide. [Claim 3] Assembly according to the preceding claim, in which the notch (16) is empty.
[Revendication 4] Ensemble selon la revendication 2, dans lequel l’encoche (16) reçoit un matériau de remplissage, notamment un matériau plastique. [Claim 4] Assembly according to claim 2, in which the notch (16) receives a filling material, in particular a plastic material.
[Revendication 5] Ensemble selon l’une des revendications 2 à 4, dans lequel l’encoche (16) présente une forme ronde, polygonale ou courbe quelconque. [Claim 5] Assembly according to one of Claims 2 to 4, in which the notch (16) has any round, polygonal or curved shape.
[Revendication 6] Ensemble selon l’une des revendications précédentes, dans lequel l’insert est formé à partir d’une feuille en matériau composite. [Claim 6] Assembly according to one of the preceding claims, in which the insert is formed from a sheet of composite material.
[Revendication 7] Ensemble selon l’une des revendications précédentes, dans lequel le corps comporte des nervures de renfort (19), notamment réalisées par moulage de la matière plastique. [Claim 7] Assembly according to one of the preceding claims, in which the body comprises reinforcing ribs (19), in particular produced by molding the plastic material.
[Revendication 8] Ensemble selon l’une des revendications précédentes, dans lequel une pluralité d’inserts sont prévue sur le corps. [Claim 8] Assembly according to one of the preceding claims, in which a plurality of inserts are provided on the body.
[Revendication 9] Ensemble selon l’une des revendications précédentes, dans lequel le corps présente un pourtour, et l’insert s’étend sur un secteur seulement de ce pourtour. [Claim 9] Assembly according to one of the preceding claims, in which the body has a perimeter, and the insert extends over only one sector of this perimeter.
[Revendication 10] Dispositif absorbeur d'énergie comportant un corps comportant une matière plastique et au moins un insert réalisé en matériau composite comprenant une matière plastique et une charge de renfort noyée dans cette matière plastique de l’insert, le corps en plastique et l’insert en composite étant liés notamment par soudage, collage, thermoformage.
[Claim 10] Energy absorber device comprising a body comprising a plastic material and at least one insert made of a composite material comprising a plastic material and a reinforcing filler embedded in this plastic material of the insert, the plastic body and the composite insert being linked in particular by welding, gluing, thermoforming.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2013010A FR3117428B1 (en) | 2020-12-10 | 2020-12-10 | Shock energy absorber assembly |
PCT/EP2021/084292 WO2022122601A1 (en) | 2020-12-10 | 2021-12-03 | Assembly for absorbing impact energy |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4259490A1 true EP4259490A1 (en) | 2023-10-18 |
Family
ID=74347397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21823888.9A Pending EP4259490A1 (en) | 2020-12-10 | 2021-12-03 | Assembly for absorbing impact energy |
Country Status (6)
Country | Link |
---|---|
US (1) | US20240034259A1 (en) |
EP (1) | EP4259490A1 (en) |
JP (1) | JP2023553627A (en) |
CN (1) | CN116568943A (en) |
FR (1) | FR3117428B1 (en) |
WO (1) | WO2022122601A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2842152B1 (en) * | 2002-07-15 | 2005-02-11 | Peugeot Citroen Automobiles Sa | BUMPER REINFORCEMENT WITH PERFECTLY IMPACT ABSORBER ELEMENTS |
DE102006058604B4 (en) * | 2006-12-11 | 2008-11-27 | Benteler Automobiltechnik Gmbh | crash box |
US7918493B2 (en) * | 2008-08-08 | 2011-04-05 | Mazda Motor Corporation | Impact energy absorber and fabrication method thereof |
DE102012015990A1 (en) * | 2012-08-11 | 2014-02-13 | Volkswagen Ag | Deformation element used as bumper assembly of motor vehicle, is provided between cross element and supporting structure whose block dimension is deformed during crash, by degradation of impact forces applied on supporting structure |
-
2020
- 2020-12-10 FR FR2013010A patent/FR3117428B1/en active Active
-
2021
- 2021-12-03 JP JP2023535560A patent/JP2023553627A/en active Pending
- 2021-12-03 EP EP21823888.9A patent/EP4259490A1/en active Pending
- 2021-12-03 US US18/257,012 patent/US20240034259A1/en active Pending
- 2021-12-03 WO PCT/EP2021/084292 patent/WO2022122601A1/en active Application Filing
- 2021-12-03 CN CN202180082183.4A patent/CN116568943A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
FR3117428B1 (en) | 2023-03-10 |
US20240034259A1 (en) | 2024-02-01 |
WO2022122601A1 (en) | 2022-06-16 |
CN116568943A (en) | 2023-08-08 |
JP2023553627A (en) | 2023-12-25 |
FR3117428A1 (en) | 2022-06-17 |
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