FR2926052A1 - Front structure for motor vehicle, has longitudinal sills with front end section equipped with support plate, and lower cross member with ends connected to front end section of sills by connection part - Google Patents
Front structure for motor vehicle, has longitudinal sills with front end section equipped with support plate, and lower cross member with ends connected to front end section of sills by connection part Download PDFInfo
- Publication number
- FR2926052A1 FR2926052A1 FR0850082A FR0850082A FR2926052A1 FR 2926052 A1 FR2926052 A1 FR 2926052A1 FR 0850082 A FR0850082 A FR 0850082A FR 0850082 A FR0850082 A FR 0850082A FR 2926052 A1 FR2926052 A1 FR 2926052A1
- Authority
- FR
- France
- Prior art keywords
- cross member
- front structure
- end section
- connecting piece
- support plate
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/152—Front or rear frames
- B62D21/155—Sub-frames or underguards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B60R19/04—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement
- B60R19/12—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement vertically spaced
-
- 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
-
- 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
- B60R2019/242—Arrangements for mounting bumpers on vehicles on two vertical sleeves, e.g. on energy absorber ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
Structure avant de véhicule automobile La présente invention est relative à une structure avant de véhicule auto-mobile du type comportant : - deux longerons, sensiblement longitudinaux, chacun étant muni d'une pla- tine de support fixée sur sa section d'extrémité avant, - une traverse supérieure, reliée en chacune de ses extrémités à la platine de support du longeron correspondant, - une traverse inférieure. L'invention concerne également un véhicule automobile équipé d'une telle structure avant. Une structure avant de véhicule automobile comporte de manière classique deux longerons, sensiblement longitudinaux, chacun étant muni d'une platine de support sur sa section d'extrémité avant, et une traverse supérieure, reliée en chacune de ses extrémités à la platine de support du longeron correspondant. The present invention relates to a front structure of a self-moving vehicle of the type comprising: two longitudinal members, substantially longitudinal, each being provided with a support plate fixed on its front end section; - An upper crossbar, connected at each of its ends to the support plate of the corresponding spar, - a bottom rail. The invention also relates to a motor vehicle equipped with such a front structure. A front structure of a motor vehicle conventionally comprises two longitudinal members, substantially longitudinal, each being provided with a support plate on its front end section, and an upper cross member, connected at each of its ends to the support plate of the corresponding spar.
Afin d'améliorer l'absorption des chocs frontaux, notamment dans le cas de chocs frontaux dits piéton, la structure avant comporte une traverse inférieure s'étendant parallèlement à la traverse supérieure. La présence d'une traverse inférieure permet de réduire les lésions graves sur les jambes des piétons en cas de choc. In order to improve the absorption of frontal shocks, in particular in the case of so-called pedestrian frontal shocks, the front structure comprises a lower rail extending parallel to the upper rail. The presence of a lower crossbar reduces serious injuries on the legs of pedestrians in case of shock.
Chacune de ces traverses est associée à des organes d'absorption d'énergie. La traverse supérieure associée à ses organes d'absorption d'énergie pour les chocs dits réparabilité et la traverse inférieure associée à ses organes d'absorption d'énergie pour les chocs dits piéton sont couramment appelés par les constructeurs respectivement voie haute et voie basse. Dans le cas d'un choc frontal, la liaison entre la voie haute et la voie basse est très importante. Or, dans les véhicules automobiles, deux configurations de la structure avant existent, avec ou sans berceau. Pour une structure avant avec un berceau, la traverse inférieure est reliée en chacune de ses extrémités par des prolonges au berceau et pour une structure avant sans berceau, la traverse inférieure est le plus souvent reliée à la traverse supérieure. Each of these sleepers is associated with energy absorbing members. The upper crossbar associated with its energy absorbing members for so-called repairability shocks and the lower cross member associated with its energy absorption members for so-called pedestrian shocks are commonly called by the manufacturers respectively high and low lane. In the case of a frontal impact, the connection between the high way and the low way is very important. However, in motor vehicles, two configurations of the front structure exist, with or without a cradle. For a front structure with a cradle, the lower rail is connected at each end by extensions to the cradle and for a front structure without a cradle, the lower rail is most often connected to the upper rail.
Mais, pour une liaison directe entre la voie haute et la voie basse, c'est-à-dire une liaison directe entre la traverse inférieure et la traverse supérieure, une déstabilisation entre ces deux voies se produit en cas de choc frontal, entraînant un mauvais comportement de la structure avant du véhicule, notamment lors d'un choc avec la partie inférieure de la jambe d'un piéton. L'invention a pour but d'améliorer le comportement de la structure avant, qui ne comporte pas de berceau, lors d'un choc avec la partie inférieure de la jambe d'un piéton, afin de réduire les risques de lésion du piéton. A cet effet, l'invention a pour objet une structure avant du type précité, ca- ractérisée en ce que la traverse inférieure est reliée en chacune de ses extrémités, par une pièce de liaison, au longeron correspondant, en arrière de la section d'extrémité avant dudit longeron. Suivant d'autres modes de réalisation, la structure avant comprend une ou plusieurs des caractéristiques suivantes, prises isolément ou suivant toutes les combinaisons techniquement possibles : - une surface d'appui de la pièce de liaison contre la traverse inférieure, est sensiblement dans le même plan vertical qu'une surface d'appui de la platine de support du longeron correspondant, contre la traverse supérieure, - la pièce de liaison comporte des nervures de renfort sensiblement Iongitu- dinales, -la pièce de liaison comprend au moins deux éléments, - un premier élément de la pièce de liaison est de forme rectiligne, sensiblement vertical, - le premier élément est une pièce mécano-soudée, - un deuxième élément de la pièce de liaison est de forme coudée, comportant une première portion sensiblement horizontale et une seconde portion sensiblement verticale, -le deuxième élément est réalisé en matière plastique. L'invention a également pour objet un véhicule automobile, caractérisé en ce qu'il comprend une telle structure avant. L'invention et ses avantages seront mieux compris à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple faite en référence aux dessins annexés, sur lesquels - la figure 1 est une vue schématique d'une structure avant selon l'invention, la figure 2 est une vue en perspective de la partie inférieure de la structure avant selon l'invention, - la figure 3 est une vue en perspective d'un élément d'une pièce de liaison de la structure avant selon l'invention, et la figure 4 est une vue en coupe longitudinale de la partie inférieure de la structure avant selon l'invention. Dans la suite de la description, les termes avant , longitudinal , transversal , vertical s'entendent par référence au système d'axes orthogonal usuel des véhicules automobiles représenté sur certaines figures et possédant : - un axe longitudinal X dirigé de l'arrière vers l'avant, - un axe transversal Y dirigé de la droite vers la gauche, et un axe vertical Z dirigé du bas vers le haut. Sur la figure 1, une structure avant 2 de véhicule automobile comporte, de manière classique et de chaque côté du véhicule, un longeron 4, sensiblement longitudinal, muni d'une platine de support 6 fixée sur sa section d'extrémité avant 8. However, for a direct connection between the high and the low tracks, ie a direct connection between the lower cross member and the upper cross member, a destabilization between these two paths occurs in the event of a frontal impact, resulting in a bad behavior of the front structure of the vehicle, especially during an impact with the lower part of a pedestrian's leg. The invention aims to improve the behavior of the front structure, which has no cradle, during an impact with the lower leg of a pedestrian, to reduce the risk of injury to the pedestrian. For this purpose, the subject of the invention is a front structure of the abovementioned type, characterized in that the lower crossmember is connected at each of its ends by a connecting piece to the corresponding spar behind the rear section. front end of said spar. According to other embodiments, the front structure comprises one or more of the following characteristics, taken separately or in any technically possible combination: a bearing surface of the connecting piece against the lower cross member, is substantially in the same vertical plane that a support surface of the support plate of the corresponding spar, against the upper crossbar, - the connecting piece comprises substantially longitudinal reinforcing ribs, -the connecting piece comprises at least two elements, - a first element of the connecting piece is of rectilinear shape, substantially vertical, - the first element is a mechanically welded part, - a second element of the connecting piece is of bent shape, having a first substantially horizontal portion and a second substantially vertical portion, the second element is made of plastic. The invention also relates to a motor vehicle, characterized in that it comprises such a front structure. The invention and its advantages will be better understood on reading the description which follows, given solely by way of example with reference to the accompanying drawings, in which - FIG. 1 is a schematic view of a front structure according to FIG. FIG. 2 is a perspective view of the lower part of the front structure according to the invention, FIG. 3 is a perspective view of an element of a connecting piece of the front structure according to FIG. invention, and Figure 4 is a longitudinal sectional view of the lower part of the front structure according to the invention. In the remainder of the description, the terms front, longitudinal, transverse, vertical are understood by reference to the usual orthogonal axis system of motor vehicles shown in certain figures and having: a longitudinal axis X directed from the rear to the before, - a transverse axis Y directed from right to left, and a vertical axis Z directed from the bottom to the top. In FIG. 1, a front structure 2 of a motor vehicle comprises, in a conventional manner and on each side of the vehicle, a substantially longitudinal spar 4, provided with a support plate 6 fixed on its front end section 8.
La platine de support 6 présente à son extrémité avant une surface d'appui 9 sensiblement verticale. La structure avant 2 comprend également une traverse supérieure 10 et une traverse inférieure 12, s'étendant sensiblement parallèlement l'une par rapport à l'autre. The support plate 6 has at its front end a bearing surface 9 substantially vertical. The front structure 2 also comprises an upper cross member 10 and a lower cross member 12, extending substantially parallel to each other.
La traverse supérieure 10 comporte une poutre transversale haute 14, s'étendant sur la largeur du véhicule, et reliée en chacune de ses extrémités par l'intermédiaire d'absorbeur de chocs 16 à la surface d'appui 9 de la platine de support du longeron 4 correspondant. La traverse inférieure 12 comporte une poutre transversale basse 18, s'étendant sur toute la largeur du véhicule, munie en chacune de ses extrémités d'un absorbeur de chocs 20. The upper cross member 10 comprises a high transverse beam 14, extending over the width of the vehicle, and connected at each of its ends by means of shock absorber 16 to the bearing surface 9 of the support plate of the corresponding spar 4. The lower cross member 12 comprises a low transverse beam 18, extending over the entire width of the vehicle, provided at each of its ends with a shock absorber 20.
La traverse inférieure 12 est reliée en chacune de ses extrémités par une pièce de liaison 22 au longeron 4 correspondant, en arrière de sa section d'extrémité avant 8. Dans l'exemple de réalisation représenté sur les figures, la pièce de liaison 22 comprend un premier élément 24 et un deuxième élément 26. Le premier élément 24 est un parallélépipède rectangle, s'étendant sensiblement verticalement, et dont les faces latérales sont évidées en leur centre. Le premier élément 24 est muni de nervures de renfort sensiblement longitudinales, non représentées, Le premier élément 24 est une pièce mécano-soudée. The lower cross member 12 is connected at each of its ends by a connecting piece 22 to the corresponding spar 4, behind its front end section 8. In the embodiment shown in the figures, the connecting piece 22 comprises a first element 24 and a second element 26. The first element 24 is a rectangular parallelepiped, extending substantially vertically, and whose side faces are recessed in their center. The first element 24 is provided with substantially longitudinal reinforcing ribs, not shown. The first element 24 is a mechanically welded part.
Le deuxième élément 26, visible notamment sur la figure 3, est de forme coudée, comportant une première portion 28 sensiblement horizontale et une seconde portion 30 sensiblement verticale. La première portion 28 présente à son extrémité avant une surface d'appui 32, sensiblement verticale, la traverse inférieure 12 étant fixée à la pièce de liaison 22 sur la surface d'appui 32. The second element 26, visible in particular in Figure 3, is of bent shape, having a first portion 28 substantially horizontal and a second portion 30 substantially vertical. The first portion 28 has at its front end a bearing surface 32, substantially vertical, the lower cross member 12 being fixed to the connecting piece 22 on the bearing surface 32.
La surface d'appui 32 du deuxième élément et la surface d'appui g de la platine de support 6 sont sensiblement dans un même plan vertical P. La seconde portion 30 présente à son extrémité haute une surface de liai-son 36 avec le premier élément 24 de la pièce de liaison. Le deuxième élément 26 a une structure de forme alvéolaire et comporte des nervures de renfort 38 sensiblement longitudinales. Le deuxième élément 26 est une pièce en matière plastique. Sur la figure 4, vue en coupe longitudinale de la partie inférieure de la structure avant, la traverse inférieure 12 est fixée sur la surface d'appui 32 de la pièce de liaison 22 par l'intermédiaire de moyens de fixation de type connu, non repré- sentés. A titre d'exemple, la poutre transversale basse 18 est venue de matière de l'absorbeur de chocs 20, dont la structure est alvéolaire. Une peau 40 de pare-chocs est fixée à la structure avant 2 par des moyens de fixation non représentés, et englobe la traverse supérieure 10 et la traverse inférieure 12. The bearing surface 32 of the second element and the bearing surface g of the support plate 6 are substantially in the same vertical plane P. The second portion 30 has at its upper end a connecting surface 36 with the first element 24 of the connecting piece. The second element 26 has a honeycomb-shaped structure and comprises substantially longitudinal reinforcement ribs 38. The second element 26 is a plastic part. In Figure 4, a longitudinal sectional view of the lower part of the front structure, the lower cross member 12 is fixed on the bearing surface 32 of the connecting piece 22 by means of fastening means of known type, no represented. For example, the low transverse beam 18 is made of material of the shock absorber 20, whose structure is alveolar. A skin 40 of bumper is fixed to the front structure 2 by means of attachment not shown, and includes the upper cross member 10 and the lower cross member 12.
Ainsi, lors d'un choc avec la partie inférieure de la jambe d'un piéton, la poutre basse 18 de la traverse inférieure se déplace vers l'arrière du véhicule selon l'axe longitudinal. Le choc est alors amorti par l'absorbeur de chocs 20 et les efforts résiduels sont repris au niveau de la surface d'appui 32 de la pièce de liai- son 22. La traverse supérieure 10 n'étant pas reliée à la traverse inférieure 12, elle se déplace peu vers l'arrière lors d'un tel choc et n'a en particulier pas tendance à tourner autour de l'axe Y. La traverse supérieure 10 assure quant à elle la protection des occupants du véhicule, lorsque le véhicule percute, par exemple, un obstacle rigide à faible vitesse. La pièce de liaison 22 permet ainsi d'avoir un appui de la traverse inférieure 12 sur les longerons 4 et de découpler la partie supérieure et la partie inférieure de la structure avant 2 dans le cas d'un véhicule sans berceau. Thus, during an impact with the lower leg of a pedestrian, the lower beam 18 of the lower rail moves towards the rear of the vehicle along the longitudinal axis. The shock is then damped by the shock absorber 20 and the residual forces are resumed at the bearing surface 32 of the connecting piece 22. The upper cross member 10 is not connected to the lower cross member 12 , it moves little rearward during such an impact and in particular does not tend to rotate around the Y axis. The upper cross member 10 ensures the protection of the occupants of the vehicle, when the vehicle for example, a rigid obstacle at low speed. The connecting piece 22 thus makes it possible to have a support of the lower cross member 12 on the longitudinal members 4 and to decouple the upper part and the lower part of the front structure 2 in the case of a vehicle without a cradle.
Selon un autre mode de réalisation, la pièce de liaison 22 est constituée d'un seul élément. Selon encore un autre mode de réalisation, la surface d'appui 32 du deuxième élément et la surface d'appui 9 de la platine de support sont dans deux plans verticaux sensiblement distincts et parallèles. According to another embodiment, the connecting piece 22 consists of a single element. According to yet another embodiment, the bearing surface 32 of the second element and the bearing surface 9 of the support plate are in two substantially distinct and parallel vertical planes.
Selon d'autres modes de réalisation, la traverse inférieure 12 et/ou la tra- verse supérieure 10 ne comportent pas d'absorbeurs 20, 16. According to other embodiments, the lower cross member 12 and / or the upper crosspiece 10 do not comprise absorbers 20, 16.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0850082A FR2926052A1 (en) | 2008-01-08 | 2008-01-08 | Front structure for motor vehicle, has longitudinal sills with front end section equipped with support plate, and lower cross member with ends connected to front end section of sills by connection part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0850082A FR2926052A1 (en) | 2008-01-08 | 2008-01-08 | Front structure for motor vehicle, has longitudinal sills with front end section equipped with support plate, and lower cross member with ends connected to front end section of sills by connection part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2926052A1 true FR2926052A1 (en) | 2009-07-10 |
Family
ID=39686160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0850082A Withdrawn FR2926052A1 (en) | 2008-01-08 | 2008-01-08 | Front structure for motor vehicle, has longitudinal sills with front end section equipped with support plate, and lower cross member with ends connected to front end section of sills by connection part |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2926052A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017064535A1 (en) * | 2015-10-14 | 2017-04-20 | Arcelormittal | Motor vehicle structural component and front lower section comprising such a component |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1065108A2 (en) * | 1999-06-28 | 2001-01-03 | Mazda Motor Corporation | Structure of the front of a vehicle body |
| KR20020052914A (en) * | 2000-12-26 | 2002-07-04 | 이계안 | Bumper device for vehicle |
| WO2003010029A2 (en) * | 2001-07-25 | 2003-02-06 | Decoma International Inc. | Pedestrian safety system having lower leg impact |
-
2008
- 2008-01-08 FR FR0850082A patent/FR2926052A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1065108A2 (en) * | 1999-06-28 | 2001-01-03 | Mazda Motor Corporation | Structure of the front of a vehicle body |
| KR20020052914A (en) * | 2000-12-26 | 2002-07-04 | 이계안 | Bumper device for vehicle |
| WO2003010029A2 (en) * | 2001-07-25 | 2003-02-06 | Decoma International Inc. | Pedestrian safety system having lower leg impact |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017064535A1 (en) * | 2015-10-14 | 2017-04-20 | Arcelormittal | Motor vehicle structural component and front lower section comprising such a component |
| WO2017064611A1 (en) * | 2015-10-14 | 2017-04-20 | Arcelormittal | Motor vehicle structural component and front lower section comprising such a component |
| US10618558B2 (en) | 2015-10-14 | 2020-04-14 | Arcelormittal | Motor vehicle structural component and front lower section comprising such a component |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |
Effective date: 20091030 |