EP2137050A2 - Crossbar for dashboard of automobile and corresponding automobile - Google Patents

Crossbar for dashboard of automobile and corresponding automobile

Info

Publication number
EP2137050A2
EP2137050A2 EP08788115A EP08788115A EP2137050A2 EP 2137050 A2 EP2137050 A2 EP 2137050A2 EP 08788115 A EP08788115 A EP 08788115A EP 08788115 A EP08788115 A EP 08788115A EP 2137050 A2 EP2137050 A2 EP 2137050A2
Authority
EP
European Patent Office
Prior art keywords
cross member
connecting member
section
dashboard
motor vehicle
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.)
Withdrawn
Application number
EP08788115A
Other languages
German (de)
French (fr)
Inventor
Laurent Baudart
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.)
Faurecia Interieur Industrie SAS
Original Assignee
Faurecia Interieur Industrie SAS
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 Faurecia Interieur Industrie SAS filed Critical Faurecia Interieur Industrie SAS
Publication of EP2137050A2 publication Critical patent/EP2137050A2/en
Withdrawn legal-status Critical Current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
    • 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
    • B62D25/08—Front or rear portions
    • B62D25/14—Dashboards as superstructure sub-units
    • B62D25/145—Dashboards as superstructure sub-units having a crossbeam incorporated therein

Definitions

  • the present invention relates to a dashboard cross member of a motor vehicle intended to be fixed at its ends to the body of a motor vehicle, of the type comprising a connecting member of an intermediate region of the cross member to the body of the motor vehicle .
  • the dashboard crosspieces are arranged in motor vehicles transversely between the front lateral pillars of the vehicle body, generally called "A pillars". These dashboard crosspieces are intended to stiffen the body and support equipment, including a steering column.
  • the connecting member transmits longitudinal forces from the lower crossmember of the bay to the dashboard crossmember, and risks causing the steering column to move towards the center of the vehicle. 'back. This should be avoided for reasons of driver protection.
  • An object of the present invention is to provide a vehicle dashboard cross member which is reinforced while limiting the risk to passengers in the event of shock suffered by the motor vehicle.
  • the invention proposes a dashboard crossmember of a motor vehicle, of the aforementioned type, characterized in that the connecting member has a breaking zone intended to break in the event of impact suffered by the motor vehicle, the crossbar comprising retaining means attached to the connecting member for connecting the two parts of the connecting member separated by the rupture zone after breaking thereof.
  • the dashboard crossmember comprises one or more of the following features, taken individually or in any technically possible combination: - It comprises a first section and a second section extending over a portion of the length of the cross member in the extension of one another, the connecting member being connected to the first section;
  • the liaison body is integral with the first section;
  • the first section is made of magnesium, magnesium alloy, aluminum, or aluminum alloy, and the other section is made of aluminum, aluminum alloy or steel;
  • the retaining means have means for dissipating energy
  • the retaining means have at least one retaining piece fixed on each of the parts of the connecting member separated by the rupture zone;
  • each retaining piece has between its fasteners to the parts of the connecting member separated by the rupture zone, an energy absorption zone by plastic deformation;
  • the connecting member is intended to connect the intermediate region of the cross member to a lower cross berry or apron before a box of a motor vehicle.
  • the invention also relates to a motor vehicle comprising a box comprising a lower cross-bay and / or a front apron, and a dashboard cross member of a motor vehicle as defined above, the connecting member connects the cross member from dashboard to lower bay rail and / or to the front apron.
  • FIG. 1 is a schematic perspective view of a dashboard cross member according to the invention
  • FIGS. 2 and 3 are schematic side views of the cross member of Figure 1, respectively before and after a frontal impact;
  • FIGS. 4 and 5 are partial perspective views of a connecting member of the dashboard cross member to a lower cross of bay.
  • transverse axis Y-Y horizontal and directed from right to left, and a vertical axis Z-Z directed from bottom to top.
  • the dashboard cross member 2 extends substantially transversely, and is fixed at its axial ends to front lateral uprights 4 (shown in phantom lines) of the body of a motor vehicle.
  • Amounts 4 are usually named Piers A.
  • the cross member 2 comprises a connecting member 6 of an intermediate region 8 of the cross member 2 to a lower cross member 10 (shown in phantom) of the vehicle body.
  • the crosspiece 10 extends substantially parallel to the cross member 2, between the uprights 4, being shifted forwardly with respect to the cross member 2.
  • the connecting member 6 connects the intermediate region 8 to a front apron of the body, forming a front wall of the passenger compartment, and generally separating the passenger compartment engine.
  • the cross member 2 comprises a first axial section 12 and a second axial section 14 distinct and extending in the extension of one another along the length of the cross. Each section 12, 14 forms part of the length of the crossbar 2.
  • the section 12 is located on the driver's side, and is intended to support a steering column (not shown). It is advantageously made of a metal or light metal alloy, such as magnesium or aluminum. It preferably has reinforcing ribs so that it is both strong and lightweight.
  • 11 is for example obtained by molding or injection.
  • the section 14 is located on the passenger side and supports less important efforts. It is made for example from a steel or aluminum metal tube, so that the second section 14 is obtained at low cost, while having sufficient strength.
  • the connecting member 6 connects the section 12 to the cross member 10. It is in the form of an extension of the section 12 extending forwardly therefrom. The connecting member 6 is therefore integral with the section 12.
  • the connecting member 6 reinforces the section 12 in line with the region of the section 12 supporting the steering column, by connecting it to the cross member 10.
  • the cross member 2 also comprises a strut 18 extending substantially vertically downwardly from the section 12, and whose lower end is intended to be fixed on a floor of the body.
  • the strut 18 provides additional reinforcement of the section 12. It is for example integral with the section 12.
  • the cross member 10 In the event of a frontal impact suffered by the motor vehicle, the cross member 10 is deformed and moves backwards.
  • the connecting member 6 transmits this movement to the cross member 2, which may cause the steering column carried by the section 12 to fall backwards. This increases the risk of injury to the driver. As shown in FIG. 2, to limit this risk, the link
  • the rupture zone 20 is for example in the form of a substantially transverse plane of fracture. It is for example defined by a zone of lesser thickness of the connecting member 6.
  • the cross member 2 has retaining means 26 attached to the connecting member 6 to connect the front portion 24 and the rear portion 22 after breaking the zone 20.
  • the retaining means 26 comprise retaining pieces 28 each fixed on a side faces 30 of the connecting member 6.
  • Each retaining piece 28 is fixed, on the one hand, on the rear part 22 and, on the other hand, on the front part 24.
  • the retaining means 26 have, for example, a retaining piece 28 fastened to each lateral face 30. Only one lateral face 30 and one retaining piece 28 are visible in FIGS. 2 and 3.
  • Each retaining piece 28 is fixed on the connecting member 6 for example by screws or rivets 31 of substantially transverse axis.
  • each retaining piece 28 pivots with respect to the front portion 24 and / or the rear portion 22 about the axes of the screws or rivets 31.
  • the retainers 28 are preferably made of a less brittle material (more ductile) than that constituting the connecting member 6.
  • the retaining parts 28 are for example made of steel.
  • the retaining means 26 are used to absorb energy during an impact suffered by the motor vehicle.
  • a retaining piece 28 has, between its fasteners on the front 24 and rear 22 parts, a programmed zone of plastic deformation by elongation, of reduced thickness or width, intended for extend by absorbing energy in case of displacement of the front portion 24 relative to the rear portion 22.
  • a retaining piece 28 has, between its fastenings on the front 24 and rear 22 parts, a fold-over camber 32 intended to bend with energy absorption in case of displacement. identify the second part 24 in relation to the second part 22.
  • the retaining means 26 are arranged to dissipate energy by friction.
  • the retaining means 26 comprise, for example, a friction pad 34 interposed between a retaining piece 28 and each of the rear and forward parts 22 and 22 of the connecting member 6.
  • the retaining piece 28 rubs on the pads 34 by dissipating energy.
  • the pads 34 make it possible to control the frictional force, and, in the case of a magnesium connection member 6, avoid a significant direct friction of the retaining piece 28 on the magnesium.
  • a friction pad is interposed between the retainer 28 and only one of the front 24 and rear 22.
  • the invention applies in particular to the dashboard crosspieces having a conductor side portion made of magnesium to obtain a reinforced and yet lightweight section.

Abstract

The invention relates to a crossbar to be attached at the ends thereof to the frame of an automobile, of the type that comprises a member (6) for linking an intermediate region (8) of the crossbar to the frame of the automobile. In one aspect of the invention, the linking member (6) has a breaking area (20) which breaks in case of a shock to the automobile, the crossbar (10) including a retaining means (28) provided on the linking member (6) for connecting the two portions (22, 24) of the linking member separated by the breaking area (20) after the breaking thereof. The linking member connects the crossbar of a dashboard to a lower crossbar of the bay (10) or to a front wall of the frame of the automobile.

Description

Traverse de planche de bord de véhicule automobile et véhicule automobile correspondant Dashboard cross member of a motor vehicle and corresponding motor vehicle
La présente invention concerne une traverse de planche de bord de véhicule automobile destinée à être fixée par ses extrémités à la caisse d'un véhicule automobile, du type comprenant un organe de liaison d'une région intermédiaire de la traverse à la caisse du véhicule automobile.The present invention relates to a dashboard cross member of a motor vehicle intended to be fixed at its ends to the body of a motor vehicle, of the type comprising a connecting member of an intermediate region of the cross member to the body of the motor vehicle .
Les traverses de planche de bord sont disposées dans les véhicules automobiles transversalement entre les montants latéraux avant de la caisse du véhicule, généralement nommés « piliers A ». Ces traverses de planche de bord sont destinées à rigidifier la caisse et à supporter des équipements, notamment une colonne de direction.The dashboard crosspieces are arranged in motor vehicles transversely between the front lateral pillars of the vehicle body, generally called "A pillars". These dashboard crosspieces are intended to stiffen the body and support equipment, including a steering column.
Pour renforcer la traverse de planche de bord dans une région intermédiaire de la planche de bord destinée à supporter la colonne de direction, il est possible de prévoir un organe de liaison de cette région intermédiaire à la caisse, notamment à une traverse inférieure de baie s'étendant sensiblement parallèlement à la traverse de planche de bord sous l'extrémité avant du pare-brise.To reinforce the dashboard crossbar in an intermediate region of the dashboard for supporting the steering column, it is possible to provide a connecting member of this intermediate region to the body, in particular to a lower crossbar s extending substantially parallel to the dashboard beam under the front end of the windshield.
Toutefois, en cas de choc frontal subi par le véhicule, l'organe de liaison transmet des efforts longitudinaux de la traverse inférieure de baie vers la traverse de planche de bord, et risque de provoquer un déplacement de la colonne de di- rection vers l'arrière. Ceci doit être évité pour des raisons de protection du conducteur.However, in the event of a frontal impact to the vehicle, the connecting member transmits longitudinal forces from the lower crossmember of the bay to the dashboard crossmember, and risks causing the steering column to move towards the center of the vehicle. 'back. This should be avoided for reasons of driver protection.
Un but de la présente invention est de proposer une traverse de planche de bord de véhicule automobile qui soit renforcée tout en limitant les risques pour les passagers en cas de choc subi par le véhicule automobile. A cet effet, l'invention propose une traverse de planche de bord de véhicule automobile, du type précité, caractérisée en ce que l'organe de liaison possède une zone de rupture destinée à se rompre en cas de choc subi par le véhicule automobile, la traverse comprenant des moyens de retenue rapportés sur l'organe de liaison pour relier les deux parties de l'organe de liaison séparées par la zone de rupture après la rupture de celle-ci.An object of the present invention is to provide a vehicle dashboard cross member which is reinforced while limiting the risk to passengers in the event of shock suffered by the motor vehicle. For this purpose, the invention proposes a dashboard crossmember of a motor vehicle, of the aforementioned type, characterized in that the connecting member has a breaking zone intended to break in the event of impact suffered by the motor vehicle, the crossbar comprising retaining means attached to the connecting member for connecting the two parts of the connecting member separated by the rupture zone after breaking thereof.
Selon d'autres modes de réalisation, la traverse de planche de bord comprend une ou plusieurs des caractéristiques suivantes, prise(s) isolément ou selon toutes les combinaisons techniquement possibles : - elle comprend un premier tronçon et un deuxième tronçon s'étendant sur une partie de la longueur de la traverse dans le prolongement l'un de l'autre, l'organe de liaison étant relié au premier tronçon ;According to other embodiments, the dashboard crossmember comprises one or more of the following features, taken individually or in any technically possible combination: - It comprises a first section and a second section extending over a portion of the length of the cross member in the extension of one another, the connecting member being connected to the first section;
- l'organe de liaison est venu de matière avec le premier tronçon ; - le premier tronçon est réalisé en magnésium, en alliage de magnésium, en aluminium, ou en alliage d'aluminium, et l'autre tronçon est réalisé en aluminium, en alliage d'aluminium ou en acier ;- the liaison body is integral with the first section; - The first section is made of magnesium, magnesium alloy, aluminum, or aluminum alloy, and the other section is made of aluminum, aluminum alloy or steel;
- les moyens de retenue possèdent des moyens de dissipation d'énergie ;the retaining means have means for dissipating energy;
- les moyens de retenue possèdent au moins une pièce de retenue fixée sur chacune des parties de l'organe de liaison séparées par la zone de rupture ;- The retaining means have at least one retaining piece fixed on each of the parts of the connecting member separated by the rupture zone;
- la ou chaque pièce de retenue possède entre ses fixations aux parties de l'organe de liaison séparées par la zone de rupture, une zone d'absorption d'énergie par déformation plastique ; et- The or each retaining piece has between its fasteners to the parts of the connecting member separated by the rupture zone, an energy absorption zone by plastic deformation; and
- l'organe de liaison est destiné à relier la région intermédiaire de la traverse à une traverse inférieure de baie ou à un tablier avant d'une caisse d'un véhicule automobile.- The connecting member is intended to connect the intermediate region of the cross member to a lower cross berry or apron before a box of a motor vehicle.
L'invention concerne également un véhicule automobile comprenant une caisse comprenant une traverse inférieure de baie et/ou un tablier avant, et une traverse de planche de bord de véhicule automobile telle que définie ci-dessus, dont l'organe de liaison relie la traverse de planche de bord à la traverse inférieure de baie et/ou au tablier avant.The invention also relates to a motor vehicle comprising a box comprising a lower cross-bay and / or a front apron, and a dashboard cross member of a motor vehicle as defined above, the connecting member connects the cross member from dashboard to lower bay rail and / or to the front apron.
L'invention et ses avantages seront mieux compris à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et faite en se référant aux dessins annexés, sur lesquels : - la figure 1 est une vue schématique en perspective d'une traverse de planche de bord conforme à l'invention ;The invention and its advantages will be better understood on reading the description which follows, given solely by way of example, and with reference to the appended drawings, in which: FIG. 1 is a schematic perspective view of a dashboard cross member according to the invention;
- les figures 2 et 3 sont des vues schématiques de côté de la traverse de la figure 1 , respectivement avant et après un choc frontal ; et- Figures 2 and 3 are schematic side views of the cross member of Figure 1, respectively before and after a frontal impact; and
- les figures 4 et 5 sont des vues partielles en perspective d'un organe de liaison de la traverse de planche de bord à une traverse inférieure de baie.- Figures 4 and 5 are partial perspective views of a connecting member of the dashboard cross member to a lower cross of bay.
Dans la suite de la description, les termes « longitudinal », « transversal », « avant », « arrière », « droite », « gauche », « haut », « bas », « horizontal » et « vertical » s'entendent par rapport au repère orthogonal usuel des véhicules automobiles, représenté sur la figure 1 , et comprenant :In the remainder of the description, the terms "longitudinal", "transverse", "forward", "back", "right", "left", "up", "down", "horizontal" and "Vertical" means with respect to the usual orthogonal reference mark of the motor vehicles, represented in FIG. 1, and comprising:
- un axe longitudinal X-X, horizontal et dirigé vers de l'arrière vers l'avant,a longitudinal axis X-X, horizontal and directed towards the rear towards the front,
- un axe transversal Y-Y, horizontal et dirigé de la droite vers la gauche, et un axe vertical Z-Z dirigé du bas vers le haut.- a transverse axis Y-Y, horizontal and directed from right to left, and a vertical axis Z-Z directed from bottom to top.
Tel que représenté sur la figure 1 , la traverse 2 de planche de bord s'étend sensiblement transversalement, et est fixée par ses extrémités axiales à des montants latéraux avant 4 (représentés en traits mixtes) de la caisse d'un véhicule au- tomobile. Les montants 4 sont généralement nommés piliers A.As shown in FIG. 1, the dashboard cross member 2 extends substantially transversely, and is fixed at its axial ends to front lateral uprights 4 (shown in phantom lines) of the body of a motor vehicle. . Amounts 4 are usually named Piers A.
La traverse 2 comprend un organe de liaison 6 d'une région intermédiaire 8 de la traverse 2 à une traverse inférieure de baie 10 (représentée en traits mixtes) de la caisse du véhicule.The cross member 2 comprises a connecting member 6 of an intermediate region 8 of the cross member 2 to a lower cross member 10 (shown in phantom) of the vehicle body.
La traverse 10 s'étend sensiblement parallèlement à la traverse 2, entre les montants 4, en étant décalée vers l'avant par rapport à la traverse 2. La traverseThe crosspiece 10 extends substantially parallel to the cross member 2, between the uprights 4, being shifted forwardly with respect to the cross member 2. The crosspiece
10 s'étend généralement sous l'extrémité avant du pare-brise.10 generally extends below the front end of the windshield.
En variante ou en option, l'organe de liaison 6 relie la région intermédiaire 8 à un tablier avant de la caisse, formant une paroi avant de l'habitacle, et séparant généralement l'habitacle du compartiment moteur. La traverse 2 comprend un premier tronçon axial 12 et un deuxième tronçon axial 14 distincts et s'étendant dans le prolongement l'un de l'autre suivant la longueur de la traverse. Chaque tronçon 12, 14 forme une partie de la longueur de la traverse 2.Alternatively or optionally, the connecting member 6 connects the intermediate region 8 to a front apron of the body, forming a front wall of the passenger compartment, and generally separating the passenger compartment engine. The cross member 2 comprises a first axial section 12 and a second axial section 14 distinct and extending in the extension of one another along the length of the cross. Each section 12, 14 forms part of the length of the crossbar 2.
Le tronçon 12 est situé du côté conducteur, et est destiné à supporter une colonne de direction (non représentée). Il est avantageusement réalisé en un métal ou alliage métallique léger, tel que du magnésium ou de l'aluminium. Il possède de préférence des nervures de renfort de sorte qu'il est à la fois résistant et léger.The section 12 is located on the driver's side, and is intended to support a steering column (not shown). It is advantageously made of a metal or light metal alloy, such as magnesium or aluminum. It preferably has reinforcing ribs so that it is both strong and lightweight.
11 est par exemple obtenu par moulage ou injection.11 is for example obtained by molding or injection.
Le tronçon 14 est situé du côté passager et supporte des efforts moins im- portants. Il est réalisé par exemple à partir d'un tube métallique en acier ou en aluminium, de sorte que le deuxième tronçon 14 est obtenu à faible coût, tout en présentant une résistance suffisante. L'organe de liaison 6 relie le tronçon 12 à la traverse 10. Il est réalisé sous la forme d'une extension du tronçon 12 s'étendant vers l'avant à partir de celui-ci. L'organe de liaison 6 est donc venu de matière avec le tronçon 12.The section 14 is located on the passenger side and supports less important efforts. It is made for example from a steel or aluminum metal tube, so that the second section 14 is obtained at low cost, while having sufficient strength. The connecting member 6 connects the section 12 to the cross member 10. It is in the form of an extension of the section 12 extending forwardly therefrom. The connecting member 6 is therefore integral with the section 12.
L'organe de liaison 6 permet de renforcer le tronçon 12 au droit de la région du tronçon 12 supportant la colonne de direction, en le reliant à la traverse 10.The connecting member 6 reinforces the section 12 in line with the region of the section 12 supporting the steering column, by connecting it to the cross member 10.
La traverse 2 comprend également une jambe de force 18 s'étendant sensiblement verticalement vers le bas à partir du tronçon 12, et dont l'extrémité inférieure est destinée à être fixée sur un plancher de la caisse.The cross member 2 also comprises a strut 18 extending substantially vertically downwardly from the section 12, and whose lower end is intended to be fixed on a floor of the body.
La jambe de force 18 réalise un renfort supplémentaire du tronçon 12. Elle est par exemple venue de matière avec le tronçon 12.The strut 18 provides additional reinforcement of the section 12. It is for example integral with the section 12.
En cas de choc frontal subi par le véhicule automobile, la traverse 10 est déformée et recule vers l'arrière. L'organe de liaison 6 transmet ce mouvement à la traverse 2, ce qui risque de faire reculer la colonne de direction portée par le tronçon 12. Ceci augmente les risques de blessure du conducteur. Tel que représenté sur la figure 2, pour limiter ce risque, l'organe de liaisonIn the event of a frontal impact suffered by the motor vehicle, the cross member 10 is deformed and moves backwards. The connecting member 6 transmits this movement to the cross member 2, which may cause the steering column carried by the section 12 to fall backwards. This increases the risk of injury to the driver. As shown in FIG. 2, to limit this risk, the link
6 possède une zone de rupture programmée 20, affaiblie, disposée entre une partie arrière 22 de l'organe de liaison 6, reliée à la traverse 2, et une partie avant 24 de l'organe de liaison 6, fixée sur la traverse 10.6 has a weakened programmed break zone 20 disposed between a rear portion 22 of the connecting member 6, connected to the cross member 2, and a front portion 24 of the connecting member 6 fixed to the cross member 10.
La zone de rupture 20 se présente par exemple sous la forme d'un plan de cassure sensiblement transversal. Elle est par exemple définie par une zone de moindre épaisseur de l'organe de liaison 6.The rupture zone 20 is for example in the form of a substantially transverse plane of fracture. It is for example defined by a zone of lesser thickness of the connecting member 6.
Ainsi, comme illustré sur la figure 3, en cas de choc frontal, la partie avant 24 se sépare de la partie arrière 22, ce qui permet un déplacement de la traverse 10 par rapport à la traverse 2 en limitant les efforts longitudinaux dirigés vers l'arrière sur la région intermédiaire de la traverse 2 portant la colonne de direction. Afin d'éviter que la partie avant 24 soit projetée vers l'arrière dans l'habitacle du véhicule automobile, la traverse 2 possède des moyens de retenue 26 rapportés sur l'organe de liaison 6 pour relier la partie avant 24 et la partie arrière 22 après rupture de la zone 20. Tels que représentés sur les figures 2 et 3, les moyens de retenue 26 comprennent des pièces de retenue 28 chacune fixée sur une faces latérales 30 de l'organe de liaison 6. Chaque pièce de retenue 28 est fixée, d'une part, sur la partie arrière 22 et, d'autre part, sur la partie avant 24. Les moyens de retenue 26 possèdent par exemple une pièce de retenue 28 fixée sur chaque face latérale 30. Une seule face latérale 30 et une seule pièce de retenue 28 sont visibles sur les figures 2 et 3.Thus, as illustrated in FIG. 3, in the event of a frontal impact, the front portion 24 separates from the rear portion 22, which allows the cross-member 10 to move relative to the cross-member 2 by limiting the longitudinal forces directed towards the front end. rear on the intermediate region of the crossbar 2 carrying the steering column. In order to prevent the front portion 24 from being projected rearward into the passenger compartment of the motor vehicle, the cross member 2 has retaining means 26 attached to the connecting member 6 to connect the front portion 24 and the rear portion 22 after breaking the zone 20. As shown in Figures 2 and 3, the retaining means 26 comprise retaining pieces 28 each fixed on a side faces 30 of the connecting member 6. Each retaining piece 28 is fixed, on the one hand, on the rear part 22 and, on the other hand, on the front part 24. The retaining means 26 have, for example, a retaining piece 28 fastened to each lateral face 30. Only one lateral face 30 and one retaining piece 28 are visible in FIGS. 2 and 3.
Chaque pièce de retenue 28 est fixée sur l'organe de liaison 6 par exemple par des vis ou des rivets 31 d'axe sensiblement transversal.Each retaining piece 28 is fixed on the connecting member 6 for example by screws or rivets 31 of substantially transverse axis.
En cas de rupture de la zone 20 de l'organe de liaison 6, la partie avant 24 se sépare de la partie arrière 22, mais reste retenue sur cette dernière par les pièces de retenue 28.In case of rupture of the zone 20 of the connecting member 6, the front portion 24 separates from the rear portion 22, but remains retained on the latter by the retaining pieces 28.
Tel qu'illustré sur la figure 3, chaque pièce de retenue 28 pivote par rapport à la partie avant 24 et/ou à la partie arrière 22 autour des axes des vis ou rivets 31.As illustrated in FIG. 3, each retaining piece 28 pivots with respect to the front portion 24 and / or the rear portion 22 about the axes of the screws or rivets 31.
Les pièces de retenue 28 sont de préférence réalisées dans un matériau moins cassant (plus ductile) que celui constituant l'organe de liaison 6. Les pièces de retenue 28 sont par exemple réalisées en acier. Avantageusement les moyens de retenue 26 sont utilisées pour absorber de l'énergie lors d'un choc subi par le véhicule automobile.The retainers 28 are preferably made of a less brittle material (more ductile) than that constituting the connecting member 6. The retaining parts 28 are for example made of steel. Advantageously, the retaining means 26 are used to absorb energy during an impact suffered by the motor vehicle.
Pour ce faire, il est possible de prévoir qu'une pièce de retenue 28 possède, entre ses fixations sur les parties avant 24 et arrière 22, une zone programmée de déformation plastique par allongement, d'épaisseur ou de largeur réduite, destinée à s'étendre en absorbant de l'énergie en cas de déplacement de la partie avant 24 par rapport à la partie arrière 22.To do this, it is possible to provide that a retaining piece 28 has, between its fasteners on the front 24 and rear 22 parts, a programmed zone of plastic deformation by elongation, of reduced thickness or width, intended for extend by absorbing energy in case of displacement of the front portion 24 relative to the rear portion 22.
Dans une variante représentée sur la figure 4, une pièce de retenue 28 possède, entre ses fixations sur les parties avant 24 et arrière 22, une cambrure 32 d'amorce de pli destinée à se plier avec absorption d'énergie en cas de dépla- cernent de la deuxième partie 24 par rapport à la deuxième partie 22.In a variant shown in FIG. 4, a retaining piece 28 has, between its fastenings on the front 24 and rear 22 parts, a fold-over camber 32 intended to bend with energy absorption in case of displacement. identify the second part 24 in relation to the second part 22.
Avantageusement, les moyens de retenue 26 sont agencés pour dissiper de l'énergie par frottement.Advantageously, the retaining means 26 are arranged to dissipate energy by friction.
Pour ce faire, tel que représenté sur la figure 5, les moyens de retenue 26 comprennent par exemple un patin de frottement 34 interposé entre une pièce de retenue 28 et chacune des parties arrière 22 et avant 24 de l'organe de liaison 6.To do this, as shown in FIG. 5, the retaining means 26 comprise, for example, a friction pad 34 interposed between a retaining piece 28 and each of the rear and forward parts 22 and 22 of the connecting member 6.
En cas de rupture de la zone 20, la pièce de retenue 28 frotte sur les patins 34 en dissipant de l'énergie. Les patins 34 permettent de contrôler l'effort de frottement, et, dans le cas d'un organe de liaison 6 en magnésium, évitent un frottement direct important de la pièce de retenue 28 sur le magnésium.In case of rupture of the zone 20, the retaining piece 28 rubs on the pads 34 by dissipating energy. The pads 34 make it possible to control the frictional force, and, in the case of a magnesium connection member 6, avoid a significant direct friction of the retaining piece 28 on the magnesium.
En variante, un patin de frottement est interposé entre la pièce de retenue 28 et une seule des parties avant 24 et arrière 22.Alternatively, a friction pad is interposed between the retainer 28 and only one of the front 24 and rear 22.
L'invention s'applique en particulier aux traverses de planche de bord possédant un tronçon côté conducteur réalisé en magnésium pour obtenir un tronçon renforcé et néanmoins léger. The invention applies in particular to the dashboard crosspieces having a conductor side portion made of magnesium to obtain a reinforced and yet lightweight section.

Claims

REVENDICATIONS
1.- Traverse de planche de bord de véhicule automobile, destinée à être fixée par ses extrémités à la caisse d'un véhicule automobile, du type comprenant un organe de liaison (6) d'une région intermédiaire (8) de la traverse à la caisse du véhicule automobile, caractérisée en ce que l'organe de liaison (6) possède une zone de rupture (20) destinée à se rompre en cas de choc subi par le véhicule automobile, la traverse comprenant des moyens de retenue (28) rapportés sur l'organe de liaison (6) pour relier les deux parties (22, 24) de l'organe de liaison séparées par la zone de rupture (20) après la rupture de celle-ci.1. A dashboard cross member of a motor vehicle, intended to be fixed at its ends to the body of a motor vehicle, of the type comprising a connecting member (6) of an intermediate region (8) of the cross member. the body of the motor vehicle, characterized in that the connecting member (6) has a rupture zone (20) intended to break in the event of impact suffered by the motor vehicle, the crossmember comprising retaining means (28) reported on the connecting member (6) for connecting the two parts (22, 24) of the connecting member separated by the rupture zone (20) after breaking thereof.
2.- Traverse de planche de bord selon la revendication 1 , caractérisée en ce qu'elle comprend un premier tronçon (12) et un deuxième tronçon (14) s'étendant sur une partie de la longueur de la traverse dans le prolongement l'un de l'autre, l'organe de liaison (6) étant relié au premier tronçon (12, 14). 2. Dashboard cross member according to claim 1, characterized in that it comprises a first section (12) and a second section (14) extending over a portion of the length of the cross member in the extension the one of the other, the connecting member (6) being connected to the first section (12, 14).
3.- Traverse de planche de bord selon la revendication 2, caractérisée en ce que l'organe de liaison (6) est venu de matière avec le premier tronçon (12).3.- dashboard cross member according to claim 2, characterized in that the connecting member (6) is integral with the first section (12).
4.- Traverse de planche de bord selon la revendication 2 ou 3, caractérisée en ce que le premier tronçon (12) est réalisé en magnésium, en alliage de magnésium, en aluminium, ou en alliage d'aluminium, et l'autre tronçon est réalisé en aluminium, en alliage d'aluminium ou en acier.4.- dashboard cross member according to claim 2 or 3, characterized in that the first section (12) is made of magnesium, magnesium alloy, aluminum, or aluminum alloy, and the other section is made of aluminum, aluminum alloy or steel.
5.- Traverse de planche de bord selon l'une quelconque des revendications précédentes, caractérisée en ce que les moyens de retenue (26) possèdent des moyens (32, 34) de dissipation d'énergie.5. Dashboard cross member according to any one of the preceding claims, characterized in that the retaining means (26) have means (32, 34) for dissipating energy.
6.- Traverse de planche de bord selon l'une quelconque des revendications précédentes, caractérisée en ce que les moyens de retenue (26) possèdent au moins une pièce de retenue (28) fixée sur chacune des parties (22, 24) de l'organe de liaison séparées par la zone de rupture (20).6. Dashboard cross member according to any one of the preceding claims, characterized in that the retaining means (26) have at least one retaining piece (28) fixed on each of the parts (22, 24) of the connecting member separated by the rupture zone (20).
7.- Traverse de planche de bord selon la revendication 6, caractérisée en ce que la ou chaque pièce de retenue (28) possède entre ses fixations aux par- ties (22, 24) de l'organe de liaison séparées par la zone de rupture (20), une zone d'absorption d'énergie par déformation plastique.7.- dashboard cross member according to claim 6, characterized in that the or each retaining piece (28) has between its attachments to the parts (22, 24) of the connecting member separated by the zone of rupture (20), a zone of energy absorption by plastic deformation.
8.- Traverse de planche de bord selon l'une quelconque des revendications précédentes, caractérisée en ce que l'organe de liaison (6) est destiné à relier la région intermédiaire (8) de la traverse à une traverse inférieure de baie ou à un tablier avant d'une caisse d'un véhicule automobile.8. Dashboard cross member according to any one of the preceding claims, characterized in that the connecting member (6) is intended to connect the intermediate region (8) of the cross member at a lower cross-bay or apron before a box of a motor vehicle.
9.- Véhicule automobile comprenant une traverse de planche de bord selon l'une quelconque des revendications précédentes, fixée à ses extrémités sur des montants latéraux avant d'une caisse du véhicule, et reliée par l'organe de liaison à une traverse inférieure de baie ou un tablier avant de la caisse. 9. A motor vehicle comprising a dashboard cross member according to any one of the preceding claims, fixed at its ends to the front side pillars of a vehicle body, and connected by the connecting member to a lower rail of bay or apron before the crate.
EP08788115A 2007-04-13 2008-04-03 Crossbar for dashboard of automobile and corresponding automobile Withdrawn EP2137050A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0754476A FR2914900B1 (en) 2007-04-13 2007-04-13 AUTOMOTIVE VEHICLE DASHBOARD TRAILER AND CORRESPONDING MOTOR VEHICLE.
PCT/FR2008/050591 WO2008142320A2 (en) 2007-04-13 2008-04-03 Crossbar for dashboard of automobile and corresponding automobile

Publications (1)

Publication Number Publication Date
EP2137050A2 true EP2137050A2 (en) 2009-12-30

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ID=38698774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08788115A Withdrawn EP2137050A2 (en) 2007-04-13 2008-04-03 Crossbar for dashboard of automobile and corresponding automobile

Country Status (4)

Country Link
EP (1) EP2137050A2 (en)
CN (1) CN101541623A (en)
FR (1) FR2914900B1 (en)
WO (1) WO2008142320A2 (en)

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FR2965530B1 (en) * 2010-09-30 2013-03-01 Faurecia Interieur Ind DASHBOARD TRAILER ASSEMBLY FOR MOTOR VEHICLE.
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Also Published As

Publication number Publication date
CN101541623A (en) 2009-09-23
WO2008142320A2 (en) 2008-11-27
WO2008142320A3 (en) 2009-02-05
FR2914900B1 (en) 2009-07-10
FR2914900A1 (en) 2008-10-17

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