WO2012146851A1 - Vehicle bonnet comprising lining that absorbs shock in the event of a pedestrian impact - Google Patents

Vehicle bonnet comprising lining that absorbs shock in the event of a pedestrian impact Download PDF

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Publication number
WO2012146851A1
WO2012146851A1 PCT/FR2012/050730 FR2012050730W WO2012146851A1 WO 2012146851 A1 WO2012146851 A1 WO 2012146851A1 FR 2012050730 W FR2012050730 W FR 2012050730W WO 2012146851 A1 WO2012146851 A1 WO 2012146851A1
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WO
WIPO (PCT)
Prior art keywords
hood
lining
skin
zone
liner
Prior art date
Application number
PCT/FR2012/050730
Other languages
French (fr)
Inventor
Laurent Brefort
Saïd Benane
Fabrice Darowny
Original Assignee
Peugeot Citroen Automobiles Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Publication of WO2012146851A1 publication Critical patent/WO2012146851A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/10—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles
    • B62D25/105—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles for motor cars
    • 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
    • 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
    • B60R2021/343—Protecting non-occupants of a vehicle, e.g. pedestrians using deformable body panel, bodywork or components

Definitions

  • the invention relates to a vehicle hood liner.
  • the invention also relates to a hood equipped with said liner.
  • the invention also relates to a vehicle equipped with said cover and / or said liner.
  • hood of a car In addition to the mechanical protection, aesthetics and aerodynamics impose, define the hood of a car.
  • This body covers the motor housing or alternatively a chest. Given the size of the surface it must cover its dimensions, especially the length may be important on some models.
  • this body To resist its own weight, opening and closing maneuvers, and allow to remain rigidly closed position, this body must be substantially rigid; it is in a way a shield. However, this rigid member is placed substantially horizontally and presents a danger for pedestrians he may accidentally hit. A child who is being knocked over could hit the rigid hood hard, causing serious injuries.
  • the EuroNCAP association has defined several tests concerning accidents with pedestrians.
  • the pedestrian impact test performed at 40km / h, the speed at which impactors are projected representing the body parts of an adult and a child in different places.
  • the decelerations experienced by the impactors during the impact with the vehicle are then measured.
  • a HIC (Head Injury Criterion) criterion is measured and calculated by performing an integral with respect to the deceleration time experienced by the impactors. Deceleration refers directly to the violence of the shock that one seeks to diminish thanks to the deformable nature of the impact zones.
  • the criterion HIC makes it possible to establish a cartography according to the results obtained, on this cartography one can be interested in the zone of the bonnet that strikes the head of a child. This zone is defined at its upper part by the child head shock limit. Approximately one line corresponding to the horizontal projection of a line projected horizontally on the hood, the height of the line is between 70 and 100 cm.
  • the present solutions make it possible to respond to a certain extent to the problem posed, and have a relative effectiveness.
  • the patent application FR 2 917 700 A1 discloses a car hood consisting of a skin forming the visible side and a lining forming the reinforcement. The connection zone of the lining to the skin of the hood has a Z-shaped profile, intended to form a deformable zone.
  • the Z-shaped profile will allow deformation of this rigid portion of the liner and provide cushioning of some value.
  • This solution is an interesting approach that presents ways of improvement. More particularly, in the context of an impact with a smaller pedestrian such as a child, the impact zone will be shifted relative to the area of the Z-profile of the liner. The skin may deform but the lining, it may not deform enough and cause damage to the head of the pedestrian.
  • JP2002037129A discloses a vehicle hood equipped with a hook lock.
  • the latch has a certain freedom and may have a certain stroke to move in case of shock and allows the hood to deform freely.
  • the lock is mounted on a perforated sheet to facilitate deformation. This solution offers advantages in terms of deformation, but this deformation is punctual and is centered on the latch. As with previous teaching, it is less effective on the shock line of a child's head as a whole.
  • the object of the invention is to propose a cover solution that overcomes at least one of the disadvantages mentioned above. More particularly, the object of the invention is to offer cushioning superior to existing especially for a shock with a child's head.
  • the proposed solution must be simple design and implementation, light and inexpensive.
  • the subject of the invention is a vehicle bonnet liner intended to be fastened to the internal face of the hood skin, the lining comprising a sail with, successively, from a rear position to a position before a first part intended to be in position. contact with the inside of the hood skin; a second part intended to remain at a distance from the hood skin; a third part intended to be fixed to a latch holder of the hood; remarkable in that the second part comprises at least one slot in a transverse direction, configured to facilitate the deformation of the web in case of pedestrian impact.
  • the slot or slots can take various forms. They are longer in a transverse direction of the hood than wide in a longitudinal direction.
  • the slots are openings or openings in the web of the lining. The edges of these openings or openings can be very close or touch themselves, for example in the case of a slot made by cutting without removal of material.
  • the ratio between the width and the length of the slit (s) is preferably less than 1/4, more preferably 1/10, more preferably still 1/15, so as to allow adequate deformation of the liner in case of impact with a pedestrian while not weakening the overall rigidity of the hood.
  • the third part of the web is intended to remain at a distance from the hood skin.
  • the second part of the web comprises a first zone with the slot or slits, said zone being designed to be generally parallel to the corresponding part of the hood skin or to form an inclination with the skin. less than 30 °, preferably 20 °.
  • the slot or one of the slots is generally laterally centered so as to be generally aligned with the hood striker.
  • it comprises a plurality of slots arranged in a transverse general direction.
  • the or at least one of the slots has a length greater than 5%, preferably 10%, more preferably still 15% of the corresponding width of the cap.
  • the or at least one of the slots comprises two edges which are at a distance from one another.
  • the invention also relates to a vehicle hood comprising a skin and a liner fixed on the inner face of the skin, remarkable in that the liner is in accordance with the invention.
  • the cover comprises at a front part a striker and a striker support, the third part of the web of the liner being connected, preferably directly, to the striker support.
  • the second part of the lining comprises a first zone with the slot or slots and a second zone posterior to the first zone, the second zone being generally inclined downwards and forwards by horizontally when the hood is in position on the vehicle.
  • the invention also relates to a vehicle comprising a hood according to the invention which is remarkable in that the hood comprises a slot positioned under the child head impact limit.
  • the proposed solution provides superior deformability. This solution does not weigh down the entire hood and keeps the rigidity required for the hood. By adding some reinforcements we allow the deformation of certain parts. The achievable amplitudes are higher than previously known values for better cushioning. By this way, we offer more parameters available for size the hood and reach the desired value according to the HIC criterion, in particular that concerning the impact with a child's head.
  • FIG. 1 presents a front view of a motor vehicle
  • FIG. 2 shows a hood of a motor vehicle in a view from below, according to the invention
  • FIG. 3 corresponds to FIG. 2 with a zoom centered on the front central zone
  • FIG. 4 shows the sagittal section of the hood along the axis of Figure 3;
  • FIG. 5 shows a motor vehicle hood in a view from below according to a variant of the invention
  • FIG. 6 corresponds to Figure 5, illustrating the effect of a child head shock on the hood and the deformation it generates.
  • the vehicle 2 shown in FIG. 1 is of motorized type, with a motor located at the front which is covered by a cover 4.
  • the cover can also be adapted to cover a luggage compartment in the case of a vehicle with the motor located at the back.
  • This cover 4 is delimited laterally by the lateral wings 6. At the rear it is delimited by the windshield and forward by several members such as the grille, the projectors 10 and the bumper 8. It is mounted oscillating on the structure of the vehicle 2 through two pivot links and is locked in the closed position by a lock in the front of the vehicle 2. This area is particularly exposed in case of accident with a child whose head can hit the cover 4.
  • the cover 4 comprises a surface covering or skin 20 which covers the entire surface to be concealed.
  • the skin 20 extends the wings 6 according to the contours of the organs arranged at the front and rear. For the sake of aesthetics, the skin sticks closer to these organs.
  • This skin 20 can be made from a sheet of steel or aluminum. It is also conceivable to use a polymer material, composite materials such as glass fibers or carbon fibers to lighten the vehicle.
  • the surface is generally curved and can be ribbed, which generates a certain rigidity. In Figure 2, we discover the underside of the hood 4 and the reinforcements that are present.
  • a skeleton or lining 22 is developed which is placed under the skin 20 in order to support and strengthen it.
  • the liner 22 occupies substantially the same surface as the skin 20 in the engine housing. Functionally, the periphery of the liner 22 resumes the periphery of the skin 20 while remaining slightly set back to allow contact with a seal.
  • the liner 22 also receives the fastening means: the pivot connections, the plate of the striker 44. The thickness of this plate is greater in order to be able to receive fasteners by screws, or by welding.
  • the liner 22 is made from a metal sheet of thickness for example between 0.70 mm and 2.00 mm which is cut so as to hollow out, create strips and draw the projection of the liner 22.
  • the sheet is stamped to shape it.
  • the sheet is thus transformed into a volume-forming element with, for example, two-dimensional profiles of the "V", "U” or "T” angle type.
  • a metal with a very high elastic limit to absorb a maximum of energy during the elastic deformations.
  • this liner 22 from metal profiles having the forms mentioned above or in addition using round tubes, or rectangular.
  • Another embodiment may use polymeric materials, composite materials.
  • a mixed embodiment can strengthen the hood 4 without weighing it down.
  • One of the volumes can be a deformable part. In this case it may be interesting that this part is large to have great leverage at his elbows and to allow large deformations.
  • a volume forming portion may be oriented with a horizontal base to stiffen the structure.
  • the base and the connection with the skin 20 of the cover 4 form an obtuse angle: an angle greater than 1 10 °, preferably greater than 130 °.
  • Such a portion may be placed in anterior lining zone 22 to stiffen the structure near the fastening of the cover 4, but this part can become a hard point in the case of a pedestrian impact. It is for these reasons that a slot or a journey is to allow increased deformability of the portion of the liner 22.
  • This figure also shows the child head shock limit 14.
  • This line delimits the upper part of an area under which a head of a child of medium size is likely to hit the hood 4 in case of accident. This is the zone in which the invention provides maximum efficiency, for this is positioned a slot 30 below the child head shock limit 14.
  • Figure 3 shows the slot 30 which is made in the lining 22 of the cover 4 and the sagittal cutting axis 40 of the cover 4.
  • the slot 30 made in a liner 22 is a substantially horizontal surface. Significantly perpendicular to neighboring surfaces, it allows them to buckle in case of impact.
  • the sectional view of the hood of FIG. 4 along the sagittal cutting axis 40 clearly illustrates the position of the slot 30.
  • the cover 4 is illustrated in its final position on the vehicle 2. Only the front part is shown. It comprises, fixed on the inner face of its skin 20, a striker support plate 44 and the liner 22 disposed directly behind the support plate 44.
  • the liner 22 forms a veil with from the back to the front a first part 50 in contact with the inner face of the skin 20, a second portion 48 at a distance from the skin 20 and forming a volume with the latter, and a third portion 46 in connection with the support plate 44.
  • the slot 30 is arranged on the second part 48, more precisely to a first front zone of this part, the first zone forming an angle with a second inclined rear zone and ensuring the connection between the first zone and the first part 50 of the lining.
  • the structure of the liner 22 is supported on spars oriented substantially along the "X" axis which work in flexion along the Y axis and cross members oriented substantially along the Y axis which work in flexions along the X axis.
  • the bending stresses along the Y axis are more penalizing because they correspond to the opening and closing forces of the cover 4.
  • the bending stresses along the X axis are less important. Seeking to have a uniform stiffness, we can therefore afford to reduce the stiffness in bending along the X axis and thus weaken the sleepers oriented along the Y axis.
  • slots 30 will be made along the Y axis.
  • the slot 30 is positioned in the front part of the liner 22, which makes it possible to soften the structure.
  • This slot (30, 32) can act in addition to a step of the web of the lining 22 positioned at the junction with the skin 20 of the cover 4.
  • the slot 30 preferably has a length greater than 2 times the width of the liner 22 where it is made; preferentially 4 times; even more preferentially 6 times.
  • the slot may have a length greater than 5% of the width of the cover 4 for which it is intended, preferably 15%, more preferably still 40%. Concretely, the length can be between 5.00 and 40.00 cm according to the sizes of the vehicles concerned. In the case of a central slot positioned near the striker holder 44, it may be beneficial to set a slit width greater than the width of the same support.
  • a liner 22 can be made several slots (30, 32) transverse. This possibility is shown in FIG. 5. To increase the available cushioning, it is possible to place a plurality of slots (30, 32) that can cut the same surface coplanar to the "X - Z" plane; who have overlapping beginnings and ends.
  • the liner 22 and the skin 20 are intended to be assembled to form the rigid automobile hood 2. Being assembled in minimum two zones they are rigidified mutually. Preferably, they are assembled on all their contact surfaces for maximum rigidity. To add flexibility, we can choose to omit cross ties along the Y axis. This leaves more flexibility for the liner 22 to deform in case of impact. In the case of metals of the same type steel type, it is possible to use a linear or spot welding. If two different metals are used, such as steel bonded to aluminum, clinching can be performed. If a polymer or a composite material is used, a bonding will preferably be used. To increase acoustic comfort and limit vibrations, the skin can be covered with an insulator.
  • FIG 6 which essentially corresponds to Figure 4 illustrates the effect of an impact of a child head (52, 152) on the hood 4, under conditions defined by the EuroNCAP association.
  • the head 52 strikes the surface 20 of the hood at an angle of 40 ° to the vertical.
  • the cover 4 is held in the closed position by its striker support 44 which constitutes a fixed point which does not deform.
  • the head 52 In the event of an impact with a head 52 at the level of the slot, the head 52 will go down to a position 152 illustrated in dashed lines resulting in deformation and progressive depression of the skin 120, of the second part of the lining 148 and to a lesser extent a deformation of the third portion 146.
  • the slot 30 will work and open.
  • the slot 30 opens in its width along the axis "X" of the vehicle, and its surface which was flat will bend.
  • the ends of the slot 30 or the cutout may be rounded and limit the stress concentrations in case of impact. Conversely, one can choose to make slit ends 30 with sharp angles, or a cut with a point end to generate stress concentrations that can lead to tearing of the sheet of the liner 22; This further provides cushioning through the intrinsic resilience or fracture energy of the material. These stress concentration points make it possible to create break lines.
  • an automobile hood 4 which has a substantially homogeneous static stiffness and which deforms more closely near a slot 30 under the stress of an impact on the skin 20.
  • the dynamic rigidity of the hood 4 at a slot 30 may be less than or equal to half the value in the current zone.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Superstructure Of Vehicle (AREA)

Abstract

The invention relates to a motor vehicle bonnet (4) that can deform and absorb shock upon impact with a pedestrian. The invention is particularly effective in the case of child head impacts (52). The bonnet (4) comprises a skin (20), securing means (44) and a lower lining (22) serving as a reinforcement and as a deformable element acting as a fusible member. The lining (22) is characterised by a part located at a distance from the skin (20), forming a shaped section and provided with a slit (30) or opening such as to weaken the lining, the sides (46, 48) being left unrestricted in case of any potential buckling of a side of the shaped section (22). Said shaped section (22) also includes a volume-forming section having one edge inclined forwards and downwards in relation to the horizontal, providing flexibility and an ability to deform. These two features combined provide optimum deformability and shock absorption. Moreover, this solution is light, cost effective and does not require the use of additional elements.

Description

CAPOT DE VEHICULE AVEC DOUBLURE AMORTISSANTE POUR CHOC  VEHICLE COVER WITH IMPACT IMPACT LINING
PIETON.  PEDESTRIAN.
L'invention a trait à une doublure de capot de véhicule. L'invention a trait également à un capot équipé de ladite doublure. L'invention a trait également à un véhicule équipé dudit capot et/ou de ladite doublure. The invention relates to a vehicle hood liner. The invention also relates to a hood equipped with said liner. The invention also relates to a vehicle equipped with said cover and / or said liner.
En plus de la protection mécanique, l'esthétique et l'aérodynamisme imposent, définissent le capot d'une voiture. Cet organe recouvre le logement moteur ou alternativement un coffre. Vu la taille de la surface qu'il doit recouvrir ses dimensions, en particulier la longueur peut être importante sur certains modèles. Pour résister à son propre poids, aux manœuvres d'ouvertures et de fermeture, et permettre de rester en position fermée rigidement, cet organe doit être notablement rigide; il constitue en quelque sorte un bouclier. Or cet organe rigide est placé sensiblement horizontalement et présente un danger pour les piétons qu'il risque de heurter accidentellement. Un enfant qui se ferait renverser pourrait heurter de plein fouet le capot rigide, ce qui entraine de graves lésions. In addition to the mechanical protection, aesthetics and aerodynamics impose, define the hood of a car. This body covers the motor housing or alternatively a chest. Given the size of the surface it must cover its dimensions, especially the length may be important on some models. To resist its own weight, opening and closing maneuvers, and allow to remain rigidly closed position, this body must be substantially rigid; it is in a way a shield. However, this rigid member is placed substantially horizontally and presents a danger for pedestrians he may accidentally hit. A child who is being knocked over could hit the rigid hood hard, causing serious injuries.
A cet égard l'association EuroNCAP a défini plusieurs tests concernant les accidents avec les piétons. Il y a notamment le test choc piéton réalisé à 40km/h, vitesse à laquelle on projette des impacteurs représentant les parties du corps d'un adulte et d'un enfant en différents endroits. On mesure alors les décélérations subies par les impacteurs lors du choc avec le véhicule. Un critère HIC (Head Injury Criterion) est mesuré et calculé en effectuant une intégrale par rapport au temps des décélérations subies par les impacteurs. La décélération renvoie directement à la violence du choc que l'on cherche à amoindrir grâce au caractère déformable des zones d'impact. Le critère HIC permet d'établir une cartographie en fonction des résultats obtenus, sur cette cartographie on peut s'intéresser à la zone du capot que heurte la tête d'un enfant. Cette zone est définie en sa partie supérieure par la limite de choc tête enfant. On obtient approximativement une ligne correspondant à la projection horizontale d'un trait projeté horizontalement sur le capot, la hauteur de la ligne est comprise entre 70 et 100 cm. Les solutions actuelles permettent de répondre dans une certaine mesure au problème posé, et présentent une efficacité relative. La demande de brevet d'invention FR 2 917 700 A1 divulgue un capot de voiture constitué d'une peau formant le côté visible et une doublure formant le renfort. La zone de liaison de la doublure à la peau du capot présente un profil en Z, destiné à constituer une zone déformable. En cas d'impact notamment de la tête d'un piéton avec la zone correspondante de la peau extérieure du capot, le profil en Z va permettre une déformation de cette partie rigide de la doublure et offrir un amorti d'une certaine valeur. Cette solution constitue une approche intéressante qui présente des voies d'amélioration. Plus particulièrement, dans le cadre d'un impact avec un piéton de plus petite taille tel qu'un enfant, la zone d'impact sera décalée par rapport à la zone du profil en Z de la doublure. La peau pourra certes se déformer mais la doublure, elle, risque de ne pas de déformer assez et de causer des lésions à la tête du piéton. In this respect the EuroNCAP association has defined several tests concerning accidents with pedestrians. In particular, there is the pedestrian impact test performed at 40km / h, the speed at which impactors are projected representing the body parts of an adult and a child in different places. The decelerations experienced by the impactors during the impact with the vehicle are then measured. A HIC (Head Injury Criterion) criterion is measured and calculated by performing an integral with respect to the deceleration time experienced by the impactors. Deceleration refers directly to the violence of the shock that one seeks to diminish thanks to the deformable nature of the impact zones. The criterion HIC makes it possible to establish a cartography according to the results obtained, on this cartography one can be interested in the zone of the bonnet that strikes the head of a child. This zone is defined at its upper part by the child head shock limit. Approximately one line corresponding to the horizontal projection of a line projected horizontally on the hood, the height of the line is between 70 and 100 cm. The present solutions make it possible to respond to a certain extent to the problem posed, and have a relative effectiveness. The patent application FR 2 917 700 A1 discloses a car hood consisting of a skin forming the visible side and a lining forming the reinforcement. The connection zone of the lining to the skin of the hood has a Z-shaped profile, intended to form a deformable zone. In case of impact including the head of a pedestrian with the corresponding area of the outer skin of the hood, the Z-shaped profile will allow deformation of this rigid portion of the liner and provide cushioning of some value. This solution is an interesting approach that presents ways of improvement. More particularly, in the context of an impact with a smaller pedestrian such as a child, the impact zone will be shifted relative to the area of the Z-profile of the liner. The skin may deform but the lining, it may not deform enough and cause damage to the head of the pedestrian.
Le document JP2002037129A présente un capot de véhicule équipé d'un verrou avec crochet. Le verrou a une certaine liberté et peut avoir une certaine course pour se déplacer en cas de choc et permet au capot de se déformer librement. En complément, le verrou est monté sur une tôle ajourée pour faciliter la déformation. Cette solution offre des avantages en termes de déformation, mais cette déformation est ponctuelle et est centrée sur le verrou. Tout comme pour l'enseignement précédent, son efficacité est moindre sur la ligne limite de choc d'une tête d'enfant dans son ensemble. JP2002037129A discloses a vehicle hood equipped with a hook lock. The latch has a certain freedom and may have a certain stroke to move in case of shock and allows the hood to deform freely. In addition, the lock is mounted on a perforated sheet to facilitate deformation. This solution offers advantages in terms of deformation, but this deformation is punctual and is centered on the latch. As with previous teaching, it is less effective on the shock line of a child's head as a whole.
D'autres solutions prévoient d'ajouter d'autres pièces dans le capot telle une tôle supplémentaire ou un nez rapporté. Ces solutions compliquent la conception, rajoutent des éléments qui alourdissent le véhicule et ne permettent pas d'étendre la protection à tout le capot facilement. Une contrainte qui complique les possibilités de déformations d'un capot est incarnée par ses points de fixation. Généralement, les capots ouvrent vers l'arrière et sont fixés et verrouillés par une attache placée en avant, zone à laquelle on a justement besoin de souplesse. Cette fixation perturbe les déformations à proximité de la zone de choc d'une tête d'enfant qui décrit une ligne généralement transversale sur le capot. Il est également à noter que cette zone avant du véhicule comprend des éléments qui ont pour fonction d'amortir des chocs avec des éléments plus lourd et à une vitesse plus importante. Cette même partie du véhicule doit offrir un amorti pour des masses différentes à des vitesses éloignées, ce qui complique particulièrement la conception. Other solutions include adding other parts in the hood such as an additional sheet or nose added. These solutions complicate the design, add elements that weigh down the vehicle and do not extend the protection to the entire hood easily. A constraint that complicates the possibilities of deformations of a hood is embodied by its attachment points. Generally, the hoods open towards the rear and are fixed and locked by a fastener placed in front, area which is precisely needed flexibility. This fixation disrupts the deformations near the shock zone of a child's head which describes a generally transverse line on the hood. It should also be noted that this front zone of the vehicle comprises elements whose function is to absorb shocks with heavier elements and at a greater speed. This same part of the vehicle has to offer cushioning for different masses at remote speeds, which makes the design particularly difficult.
L'invention a pour objectif de proposer une solution de capot palliant au moins un des inconvénients sus mentionnés. Plus particulièrement, l'objectif de l'invention est d'offrir un amorti supérieur à l'existant notamment pour un choc avec une tête d'enfant. De plus la solution proposée doit être simple de conception et de réalisation, légère et peu onéreuse. The object of the invention is to propose a cover solution that overcomes at least one of the disadvantages mentioned above. More particularly, the object of the invention is to offer cushioning superior to existing especially for a shock with a child's head. In addition the proposed solution must be simple design and implementation, light and inexpensive.
L'invention a pour objet une doublure de capot de véhicule, destinée à être fixée à la face interne de la peau du capot, la doublure comprenant un voile avec, successivement depuis une position arrière vers une position avant un première partie destinée à être en contact avec la face intérieure de la peau du capot; une deuxième partie destinée à rester à distance de la peau du capot; une troisième partie destinée à être fixée à un support de gâche du capot; remarquable en ce que la deuxième partie comprend au moins une fente selon une direction transversale, configurée pour faciliter la déformation du voile en cas de choc piéton. The subject of the invention is a vehicle bonnet liner intended to be fastened to the internal face of the hood skin, the lining comprising a sail with, successively, from a rear position to a position before a first part intended to be in position. contact with the inside of the hood skin; a second part intended to remain at a distance from the hood skin; a third part intended to be fixed to a latch holder of the hood; remarkable in that the second part comprises at least one slot in a transverse direction, configured to facilitate the deformation of the web in case of pedestrian impact.
La ou les fentes peuvent prendre diverses formes. Elles sont plus longues selon une direction transversale du capot que larges suivant une direction longitudinale. Les fentes constituent des ouvertures ou ajours dans le voile de la doublure. Les bords de ces ouvertures ou ajours peuvent être très proches voire se toucher comme par exemple dans le cas d'une fente pratiquée par découpe sans enlèvement de matière. Le ratio entre la largeur et la longueur de la ou des fentes est préférentiellement inférieur à 1 /4, plus préférentiellement 1 /10, plus préférentiellement encore 1/15, de manière à permettre une déformation adéquate de la doublure en cas d'impact avec un piéton tout en n'affaiblissant pas la rigidité générale du capot. The slot or slots can take various forms. They are longer in a transverse direction of the hood than wide in a longitudinal direction. The slots are openings or openings in the web of the lining. The edges of these openings or openings can be very close or touch themselves, for example in the case of a slot made by cutting without removal of material. The ratio between the width and the length of the slit (s) is preferably less than 1/4, more preferably 1/10, more preferably still 1/15, so as to allow adequate deformation of the liner in case of impact with a pedestrian while not weakening the overall rigidity of the hood.
Selon un mode avantageux de l'invention, la troisième partie du voile est destinée à rester à distance de la peau du capot. According to an advantageous embodiment of the invention, the third part of the web is intended to remain at a distance from the hood skin.
Selon un autre mode avantageux de l'invention, la deuxième partie du voile comprend une première zone avec la ou les fentes, ladite zone étant conçue pour être généralement parallèle à la partie correspondante de la peau du capot ou pour former une inclinaison avec la peau de moins de 30°, préférentiellement 20°. Selon un encore autre mode avantageux de l'invention, la fente ou une des fentes est généralement centrée latéralement de manière à être généralement alignée avec la gâche du capot. According to another advantageous embodiment of the invention, the second part of the web comprises a first zone with the slot or slits, said zone being designed to be generally parallel to the corresponding part of the hood skin or to form an inclination with the skin. less than 30 °, preferably 20 °. According to yet another advantageous embodiment of the invention, the slot or one of the slots is generally laterally centered so as to be generally aligned with the hood striker.
Selon un encore autre mode avantageux de l'invention, elle comprend plusieurs fentes disposées selon une direction générale transversale. According to another advantageous embodiment of the invention, it comprises a plurality of slots arranged in a transverse general direction.
Selon un encore autre mode avantageux de l'invention, la ou au moins une des fentes présente une longueur supérieure à 5%, préférentiellement 10%, plus préférentiellement encore 15% de la largeur correspondante du capot. According to another advantageous embodiment of the invention, the or at least one of the slots has a length greater than 5%, preferably 10%, more preferably still 15% of the corresponding width of the cap.
Selon un encore autre mode avantageux de l'invention, la ou au moins une des fentes comprend deux bords qui sont à distance l'un de l'autre. According to yet another advantageous embodiment of the invention, the or at least one of the slots comprises two edges which are at a distance from one another.
L'invention a également pour objet un capot de véhicule comprenant une peau et une doublure fixée sur la face interne de la peau, remarquable en ce que la doublure est conforme à l'invention. The invention also relates to a vehicle hood comprising a skin and a liner fixed on the inner face of the skin, remarkable in that the liner is in accordance with the invention.
Selon un mode avantageux de l'invention, le capot comprend à une partie antérieure une gâche et un support de gâche, la troisième partie du voile de la doublure étant reliée, préférentiellement directement, au support de gâche. According to an advantageous embodiment of the invention, the cover comprises at a front part a striker and a striker support, the third part of the web of the liner being connected, preferably directly, to the striker support.
Selon un autre mode avantageux de l'invention, la deuxième partie de la doublure comprend une première zone avec la ou les fentes et une deuxième zone postérieure à la première zone, la deuxième zone étant généralement inclinée vers le bas et vers l'avant par rapport à l'horizontale lorsque le capot est en position sur le véhicule. According to another advantageous embodiment of the invention, the second part of the lining comprises a first zone with the slot or slots and a second zone posterior to the first zone, the second zone being generally inclined downwards and forwards by horizontally when the hood is in position on the vehicle.
L'invention a également pour objet un véhicule comprenant un capot conforme à l'invention remarquable en ce que le capot comprend une fente positionnée sous la limite de choc tête enfant. La solution proposée permet d'offrir une déformabilité supérieure. Cette solution n'alourdi pas l'ensemble du capot et permet de conserver la rigidité nécessaire au capot. En ajourant certains renforts on permet la déformation de certaines parties. Les amplitudes atteignables sont supérieures aux valeurs jusque là connues pour un meilleur amorti. Par cette voie, on offre d'avantage de paramètres disponibles pour dimensionner le capot et atteindre la valeur voulue selon le critère HIC, en particulier celui concernant le choc avec une tête d'enfant. The invention also relates to a vehicle comprising a hood according to the invention which is remarkable in that the hood comprises a slot positioned under the child head impact limit. The proposed solution provides superior deformability. This solution does not weigh down the entire hood and keeps the rigidity required for the hood. By adding some reinforcements we allow the deformation of certain parts. The achievable amplitudes are higher than previously known values for better cushioning. By this way, we offer more parameters available for size the hood and reach the desired value according to the HIC criterion, in particular that concerning the impact with a child's head.
D'autres caractéristiques et avantages de la présente invention seront mieux compris à l'aide de la description et des dessins parmi lesquels: - la figure 1 présente en vue de face un véhicule automobile, Other features and advantages of the present invention will be better understood from the description and drawings in which: FIG. 1 presents a front view of a motor vehicle;
- la figure 2 présente un capot de véhicule automobile en vue de dessous, conforme à l'invention ;  - Figure 2 shows a hood of a motor vehicle in a view from below, according to the invention;
- la figure 3 correspond à la figure 2 avec un zoom centré sur la zone centrale avant ;  FIG. 3 corresponds to FIG. 2 with a zoom centered on the front central zone;
- la figure 4 présente la coupe sagittale du capot suivant l'axe de la figure 3 ; - Figure 4 shows the sagittal section of the hood along the axis of Figure 3;
- la figure 5 présente un capot de véhicule automobile en vue de dessous selon une variante de l'invention ; - Figure 5 shows a motor vehicle hood in a view from below according to a variant of the invention;
- la figure 6 correspond à la figure 5, illustrant l'effet d'un choc tête enfant sur le capot et la déformation qu'elle engendre. Le véhicule 2 présent sur la figure 1 est de type motorisé, avec un moteur situé à l'avant qui est recouvert par un capot 4. Le capot peut également être adapté pour couvrir un coffre à bagage dans le cas d'un véhicule avec le moteur situé à l'arrière. Ce capot 4 est délimité latéralement par les ailes latérales 6. En arrière il est délimité par le pare-brise et en avant par plusieurs organes tels que la calandre, les projecteurs 10 et le pare-choc 8. Il est monté oscillant sur la structure du véhicule 2 grâce à deux liaisons pivot et est verrouillé en position fermée par un verrou à l'avant du véhicule 2. Cette zone est particulièrement exposée en cas d'accident avec un enfant dont la tête peut heurter le capot 4. Cette zone comprend la zone limite choc tête enfant. Le capot 4 comprend un habillage superficiel ou peau 20 qui recouvre l'intégralité de la surface à occulter. La peau 20 prolonge les ailes 6 suivant les contours des organes disposés à l'avant et à l'arrière. Par soucis d'esthétique, la peau colle au plus près ces organes. Cette peau 20 peut être réalisée à partir d'une tôle d'acier ou d'aluminium. Il est également envisageable de recourir à un matériau polymère, à des matériaux composites tels fibres de verre ou fibres de carbone pour alléger le véhicule. La surface est généralement bombée et peut être nervurée, ce qui génère une certaine rigidité. Sur la figure 2, on découvre le dessous du capot 4 et les renforts qui y sont présents. Pour améliorer cette rigidité sans augmenter l'épaisseur de la peau 20, on développe une ossature ou doublure 22 qui se place sous la peau 20 en vue de la soutenir et la renforcer. La doublure 22 occupe sensiblement la même surface que la peau 20 dans le logement moteur. Fonctionnellement, le pourtour de la doublure 22 reprend le pourtour de la peau 20 en restant légèrement en retrait pour permettre un contact avec un joint. La doublure 22 reçoit également les moyens de fixation: les liaisons pivot, la platine de la gâche de fixation 44. L'épaisseur de cette platine est supérieure afin d'être apte à recevoir des fixations par vis, ou par soudage. La doublure 22 est réalisée à partir d'une tôle métallique d'épaisseur comprise par exemple entre 0.70 mm et 2.00 mm qui est découpée de manière à l'évider, créer des bandes et dessiner la projection de la doublure 22. Cette étape permet de gagner du poids. Après cette découpe, la tôle est emboutie pour la mettre en forme. On transforme ainsi la tôle en un élément formant des volumes avec par exemple des profilés bidimensionnels du type cornière en « V », en « U » ou en « T ». Comme nuance d'acier on peut choisir un métal à très haute limite élastique pour absorber un maximum d'énergie au cours des déformations élastiques. Il est également possible de réaliser cette doublure 22 à partir de profilés métalliques ayant les formes précédemment citées ou en complément à l'aide de tubes ronds, ou rectangulaires. Un autre mode de réalisation peut avoir recours à des matériaux polymères, des matériaux composites. Enfin, une réalisation mixte peut renforcer le capot 4 sans l'alourdir. Un des volumes peut constituer une partie déformable. Dans ce cas il peut être intéressant que cette partie soit de dimension importante pour avoir de grands bras de levier au niveau de ses coudes et pour permettre des déformations de grande amplitude. - Figure 6 corresponds to Figure 5, illustrating the effect of a child head shock on the hood and the deformation it generates. The vehicle 2 shown in FIG. 1 is of motorized type, with a motor located at the front which is covered by a cover 4. The cover can also be adapted to cover a luggage compartment in the case of a vehicle with the motor located at the back. This cover 4 is delimited laterally by the lateral wings 6. At the rear it is delimited by the windshield and forward by several members such as the grille, the projectors 10 and the bumper 8. It is mounted oscillating on the structure of the vehicle 2 through two pivot links and is locked in the closed position by a lock in the front of the vehicle 2. This area is particularly exposed in case of accident with a child whose head can hit the cover 4. This area includes the child head shock limit zone. The cover 4 comprises a surface covering or skin 20 which covers the entire surface to be concealed. The skin 20 extends the wings 6 according to the contours of the organs arranged at the front and rear. For the sake of aesthetics, the skin sticks closer to these organs. This skin 20 can be made from a sheet of steel or aluminum. It is also conceivable to use a polymer material, composite materials such as glass fibers or carbon fibers to lighten the vehicle. The surface is generally curved and can be ribbed, which generates a certain rigidity. In Figure 2, we discover the underside of the hood 4 and the reinforcements that are present. To improve this rigidity without increasing the thickness of the skin 20, a skeleton or lining 22 is developed which is placed under the skin 20 in order to support and strengthen it. The liner 22 occupies substantially the same surface as the skin 20 in the engine housing. Functionally, the periphery of the liner 22 resumes the periphery of the skin 20 while remaining slightly set back to allow contact with a seal. The liner 22 also receives the fastening means: the pivot connections, the plate of the striker 44. The thickness of this plate is greater in order to be able to receive fasteners by screws, or by welding. The liner 22 is made from a metal sheet of thickness for example between 0.70 mm and 2.00 mm which is cut so as to hollow out, create strips and draw the projection of the liner 22. to gain weight. After this cutting, the sheet is stamped to shape it. The sheet is thus transformed into a volume-forming element with, for example, two-dimensional profiles of the "V", "U" or "T" angle type. As a steel grade one can choose a metal with a very high elastic limit to absorb a maximum of energy during the elastic deformations. It is also possible to achieve this liner 22 from metal profiles having the forms mentioned above or in addition using round tubes, or rectangular. Another embodiment may use polymeric materials, composite materials. Finally, a mixed embodiment can strengthen the hood 4 without weighing it down. One of the volumes can be a deformable part. In this case it may be interesting that this part is large to have great leverage at his elbows and to allow large deformations.
Une partie formant un volume peut être orientée avec une base horizontale pour rigidifier la structure. Pour permettre les déformations tout en étant compact la base et le raccord avec la peau 20 du capot 4 forment un angle obtus: un angle supérieur à 1 10°, préférentiellement supérieur à 130°. Une telle partie peut être placée en zone antérieure de doublure 22 pour rigidifier la structure à proximité de l'attache du capot 4, mais cette partie peut devenir un point dur dans le cas d'un choc avec piéton. C'est notamment pour ces raisons qu'une fente 30 ou ajour est prévu, de manière à permettre une déformabilité accrue de la partie en question de la doublure 22. A volume forming portion may be oriented with a horizontal base to stiffen the structure. To allow the deformations while being compact the base and the connection with the skin 20 of the cover 4 form an obtuse angle: an angle greater than 1 10 °, preferably greater than 130 °. Such a portion may be placed in anterior lining zone 22 to stiffen the structure near the fastening of the cover 4, but this part can become a hard point in the case of a pedestrian impact. It is for these reasons that a slot or ajour is to allow increased deformability of the portion of the liner 22.
Cette figure fait également apparaître la limite de choc tête enfant 14. Cette ligne délimite la partie supérieure d'une zone sous laquelle une tête d'enfant d'une taille moyenne est susceptible de heurter le capot 4 en cas d'accident. C'est la zone dans laquelle l'invention apporte un maximum d'efficacité, pour cela on positionne une fente 30 sous la limite de choc tête enfant 14. This figure also shows the child head shock limit 14. This line delimits the upper part of an area under which a head of a child of medium size is likely to hit the hood 4 in case of accident. This is the zone in which the invention provides maximum efficiency, for this is positioned a slot 30 below the child head shock limit 14.
La figure 3 présente la fente 30 qui est réalisée dans la doublure 22 du capot 4 ainsi que l'axe de découpe sagittale 40 du capot 4. La fente 30 réalisée dans une doublure 22 constitue une surface sensiblement horizontale. Sensiblement perpendiculaire aux surfaces voisines, elle permet leur flambement en cas de choc. Figure 3 shows the slot 30 which is made in the lining 22 of the cover 4 and the sagittal cutting axis 40 of the cover 4. The slot 30 made in a liner 22 is a substantially horizontal surface. Significantly perpendicular to neighboring surfaces, it allows them to buckle in case of impact.
La vue en coupe du capot de la figure 4 selon l'axe de coupe sagittale 40 illustre bien la position de la fente 30. Le capot 4 y est illustré dans sa position finale sur le véhicule 2. Seule la partie avant est représentée. Il comprend, fixé sur la face intérieure de sa peau 20, une plaque support de gâche 44 et la doublure 22 disposée directement derrière la plaque support 44. La doublure 22 forme un voile avec depuis l'arrière vers l'avant une première partie 50 en contact avec la face interne de la peau 20, une deuxième partie 48 à distance de la peau 20 et formant un volume avec cette dernière, et une troisième partie 46 en liaison avec la plaque support 44. La fente 30 est disposée sur la deuxième partie 48, plus précisément à une première zone avant de cette partie, la première zone formant un angle avec une deuxième zone arrière inclinée et assurant la liaison entre la première zone et la première partie 50 de la doublure. The sectional view of the hood of FIG. 4 along the sagittal cutting axis 40 clearly illustrates the position of the slot 30. The cover 4 is illustrated in its final position on the vehicle 2. Only the front part is shown. It comprises, fixed on the inner face of its skin 20, a striker support plate 44 and the liner 22 disposed directly behind the support plate 44. The liner 22 forms a veil with from the back to the front a first part 50 in contact with the inner face of the skin 20, a second portion 48 at a distance from the skin 20 and forming a volume with the latter, and a third portion 46 in connection with the support plate 44. The slot 30 is arranged on the second part 48, more precisely to a first front zone of this part, the first zone forming an angle with a second inclined rear zone and ensuring the connection between the first zone and the first part 50 of the lining.
La structure de la doublure 22 s'appuie sur des longerons orientés sensiblement suivant l'axe « X » qui travaillent en flexions suivant l'axe Y et des traverses orientés sensiblement suivant l'axe Y qui travaillent en flexions suivant l'axe X. Les contraintes de flexions suivant l'axe Y sont plus pénalisantes car elles correspondent aux efforts d'ouverture et fermeture du capot 4. A l'opposé, Les contraintes de flexions suivant l'axe X sont moins importantes. Cherchant à avoir une rigidité homogène, on peut donc se permettre de diminuer la rigidité en flexion suivant l'axe X et donc affaiblir les traverses orientées suivant l'axe Y. On réalisera donc des fentes 30 suivant l'axe Y. En prenant en compte le verrouillage du capot 4 en position fermée et le point dur qu'il constitue, la fente 30 est positionnée en partie antérieure de la doublure 22, ce qui permet d'assouplir la structure. Cette fente (30, 32) peut agir en complément d'une marche du voile de la doublure 22 positionnée au niveau de la jonction avec la peau 20 du capot 4. The structure of the liner 22 is supported on spars oriented substantially along the "X" axis which work in flexion along the Y axis and cross members oriented substantially along the Y axis which work in flexions along the X axis. The bending stresses along the Y axis are more penalizing because they correspond to the opening and closing forces of the cover 4. On the opposite side, the bending stresses along the X axis are less important. Seeking to have a uniform stiffness, we can therefore afford to reduce the stiffness in bending along the X axis and thus weaken the sleepers oriented along the Y axis. Thus, slots 30 will be made along the Y axis. Taking into account the locking of the cover 4 in the closed position and the hard point that it constitutes, the slot 30 is positioned in the front part of the liner 22, which makes it possible to soften the structure. This slot (30, 32) can act in addition to a step of the web of the lining 22 positioned at the junction with the skin 20 of the cover 4.
La fente 30 a préférentiellement une longueur supérieure à 2 fois la largeur de la doublure 22 où elle est réalisée ; préférentiellement 4 fois ; encore plus préférentiellement 6 fois. Une autre manière de caractériser la fente 30 permet d'aboutir aux résultats suivants : la fente peut avoir une longueur supérieure à 5 % de la largeur du capot 4 auquel elle est destinée, préférentiellement 15 %, plus préférentiellement encore 40%. Concrètement, la longueur peut être comprise entre 5.00 et 40.00 cm suivant les tailles des véhicules concernés. Dans le cas d'une fente 30 centrale positionnée à proximité du support de gâche 44 capot, il peut être bénéfique de fixer une largeur de fente 30 supérieure à la largeur de ce même support. The slot 30 preferably has a length greater than 2 times the width of the liner 22 where it is made; preferentially 4 times; even more preferentially 6 times. Another way of characterizing the slot 30 leads to the following results: the slot may have a length greater than 5% of the width of the cover 4 for which it is intended, preferably 15%, more preferably still 40%. Concretely, the length can be between 5.00 and 40.00 cm according to the sizes of the vehicles concerned. In the case of a central slot positioned near the striker holder 44, it may be beneficial to set a slit width greater than the width of the same support.
Pour assouplir sur toute sa largeur une doublure 22 on peut réaliser plusieurs fentes (30, 32) transversales. Cette possibilité est présentée sur la figure 5. Pour augmenter l'amorti disponible, on peut placer plusieurs fentes (30, 32) qui peuvent couper une même surface coplanaire au plan « X - Z » ; qui ont des débuts et des fins qui se chevauchent. To soften its entire width a liner 22 can be made several slots (30, 32) transverse. This possibility is shown in FIG. 5. To increase the available cushioning, it is possible to place a plurality of slots (30, 32) that can cut the same surface coplanar to the "X - Z" plane; who have overlapping beginnings and ends.
La doublure 22 et la peau 20 sont destinées à être assemblées pour former le capot 4 d'automobile 2 rigide. En étant assemblés en minimum deux zones ils se rigidifient mutuellement. Préférentiellement, on les assemble sur toutes leurs surfaces de contact pour un maximum de rigidité. Pour rajouter de la souplesse, on peut choisir d'omettre des fixations de traverses suivant l'axe Y. On laisse ainsi encore plus de latitude à la doublure 22 pour se déformer en cas de choc. Dans le cas de métaux de même nature type acier, on peut recourir à un soudage linéaire ou par points. Si on emploie deux métaux différents comme de l'acier lié à de l'aluminium, on peut réaliser un clinchage. Si on utilise un polymère ou un matériau composite, on utilisera préférentiellement un collage. Pour augmenter le confort acoustique et limiter les vibrations, on peut recouvrir la peau 20 d'un isolant. Cet isolant peut être intercalé entre les deux composants, et servir de support de collage intermédiaire. La figure 6 qui correspond essentiellement à la figure 4 illustre l'effet d'un impact d'une tête enfant (52, 152) sur le capot 4, dans des conditions définies par l'association EuroNCAP. La tête 52 vient heurter la surface 20 du capot avec un angle de 40° par rapport à la verticale. Le capot 4 est maintenu en position fermée par son support de gâche 44 qui constitue un point fixe qui ne se déforme pas. The liner 22 and the skin 20 are intended to be assembled to form the rigid automobile hood 2. Being assembled in minimum two zones they are rigidified mutually. Preferably, they are assembled on all their contact surfaces for maximum rigidity. To add flexibility, we can choose to omit cross ties along the Y axis. This leaves more flexibility for the liner 22 to deform in case of impact. In the case of metals of the same type steel type, it is possible to use a linear or spot welding. If two different metals are used, such as steel bonded to aluminum, clinching can be performed. If a polymer or a composite material is used, a bonding will preferably be used. To increase acoustic comfort and limit vibrations, the skin can be covered with an insulator. This insulation can be inserted between the two components, and serve as an intermediate bonding medium. Figure 6 which essentially corresponds to Figure 4 illustrates the effect of an impact of a child head (52, 152) on the hood 4, under conditions defined by the EuroNCAP association. The head 52 strikes the surface 20 of the hood at an angle of 40 ° to the vertical. The cover 4 is held in the closed position by its striker support 44 which constitutes a fixed point which does not deform.
En cas de choc avec une tête 52 au niveau de la fente, la tête 52 va s'enfoncer jusqu'à une position 152 illustrée en traits pointillés entraînant une déformation et un enfoncement progressif de la peau 120, de la deuxième partie de la doublure 148 et dans une moindre mesure une déformation de la troisième partie 146. Au cours de la déformation la fente 30 va travailler et s'ouvrir. Ainsi la fente 30 s'ouvre dans sa largeur suivant l'axe « X » du véhicule, et sa surface qui était plane va se bomber. In the event of an impact with a head 52 at the level of the slot, the head 52 will go down to a position 152 illustrated in dashed lines resulting in deformation and progressive depression of the skin 120, of the second part of the lining 148 and to a lesser extent a deformation of the third portion 146. During the deformation the slot 30 will work and open. Thus the slot 30 opens in its width along the axis "X" of the vehicle, and its surface which was flat will bend.
Les extrémités de la fente 30 ou de la découpe peuvent être arrondis et limiter les concentrations de contraintes en cas de choc. A l'inverse, on peut choisir de réaliser des extrémités de fente 30 avec des angles vifs, ou d'une découpe avec une extrémité ponctuelle pour générer des concentrations de contraintes qui peuvent aboutir à une déchirure de la tôle de la doublure 22 ; ce qui permet encore d'offrir un amorti grâce à la résilience ou énergie de rupture intrinsèque du matériau. Ces points de concentration de contraintes permettent de créer des lignes de ruptures. The ends of the slot 30 or the cutout may be rounded and limit the stress concentrations in case of impact. Conversely, one can choose to make slit ends 30 with sharp angles, or a cut with a point end to generate stress concentrations that can lead to tearing of the sheet of the liner 22; This further provides cushioning through the intrinsic resilience or fracture energy of the material. These stress concentration points make it possible to create break lines.
Ainsi pour absorber de l'énergie, on peut avoir recours à deux méthodes : utiliser la déformation des matériaux ou leur rupture qui sont deux phénomènes distincts. Thus to absorb energy, one can resort to two methods: to use the deformation of the materials or their rupture which are two distinct phenomena.
Au résultat on peut dimensionner un capot 4 d'automobile qui a une rigidité statique sensiblement homogène et qui se déforme d'avantage à proximité d'une fente 30 sous la contrainte d'un choc exercé sur la peau 20. La rigidité dynamique du capot 4 au niveau d'une fente 30 peut être inférieure ou égale à la moitié de la valeur en zone courante. As a result, it is possible to size an automobile hood 4 which has a substantially homogeneous static stiffness and which deforms more closely near a slot 30 under the stress of an impact on the skin 20. The dynamic rigidity of the hood 4 at a slot 30 may be less than or equal to half the value in the current zone.
De manière générale, pour permettre d'offrir un maximum d'amorti à un choc contre une tête d'enfant, on place une, éventuellement plusieurs fentes (30, 32) sous la limite de choc tête enfant 14. Generally, to allow to offer maximum cushioning to a shock against a child's head, is placed one, possibly several slots (30, 32) below the child head shock limit 14.

Claims

REVENDICATIONS
Doublure (22) de capot (4) de véhicule (2), destinée à être fixée à la face interne de la peau (20, 120) du capot (4), la doublure (22) comprenant un voile avec, successivement depuis une position arrière vers une position avant Lining (22) of the hood (4) of vehicle (2), intended to be fixed to the inner face of the skin (20, 120) of the hood (4), the lining (22) comprising a sail with, successively since a rear position to a forward position
une première partie (50) destinée à être en contact avec la face intérieure de la peau (20, 120) du capot (4); a first part (50) intended to be in contact with the inner face of the skin (20, 120) of the cover (4);
une deuxième partie (48, 148) destinée à rester à distance de la peau (20, 120) du capot (4); a second portion (48, 148) for remaining at a distance from the skin (20, 120) of the hood (4);
une troisième partie (46, 146) destinée à être fixée à un support de gâche (44) du capot (4); a third portion (46, 146) for attachment to a keeper bracket (44) of the hood (4);
caractérisé en ce que characterized in that
la deuxième partie (48, 148) comprend au moins une fente (30, 32) selon une direction transversale, configurée pour faciliter la déformation du voile en cas de choc piéton (52). the second part (48, 148) comprises at least one slot (30, 32) in a transverse direction, configured to facilitate deformation of the web in the event of a pedestrian impact (52).
Doublure (22) de capot (4) selon la revendication 1 , caractérisé en ce que la troisième (46, 146) partie du voile est destinée à rester à distance de la peau (20, 120) du capot (4). Lining (22) hood (4) according to claim 1, characterized in that the third (46, 146) portion of the web is intended to remain at a distance from the skin (20, 120) of the cover (4).
Doublure (22) de capot (4) selon l'une des revendications 1 à 2, caractérisé en ce que la deuxième partie (48, 148) du voile comprend une première zone avec la ou les fentes (30, 32), ladite zone étant conçue pour être généralement parallèle à la partie correspondante de la peau (20, 120) du capot (4) ou pour former une inclinaison avec la peau (20, 120) de moins de 30°, préférentiellement 20°. Hood lining (22) according to one of claims 1 to 2, characterized in that the second part (48, 148) of the web comprises a first zone with the slot or slots (30, 32), said zone being designed to be generally parallel to the corresponding portion of the skin (20, 120) of the hood (4) or to form an inclination with the skin (20, 120) of less than 30 °, preferably 20 °.
Doublure (22) de capot (4) selon l'une des revendications 1 à 3, caractérisé en ce que la fente (30) ou une des fentes (30, 32) est généralement centrée latéralement de manière à être généralement alignée avec la gâche (44) du capot (4). Hood lining (22) according to one of claims 1 to 3, characterized in that the slot (30) or one of the slots (30, 32) is generally laterally centered so as to be generally aligned with the latch (44) of the hood (4).
5. Doublure (22) de capot (4) selon l'une des revendications 1 à 4, caractérisé en ce qu'il comprend plusieurs fentes (30, 32) disposées selon une direction générale transversale. 5. lining (22) hood (4) according to one of claims 1 to 4, characterized in that it comprises a plurality of slots (30, 32) arranged in a transverse general direction.
6. Doublure (22) de capot (4) selon l'une des revendications 1 à 5, caractérisé en ce que la ou au moins une des fentes (30, 32) présente une longueur supérieure à 5%, préférentiellement 10%, plus préférentiellement encore 15% de la largeur correspondante du capot (4). 6. lining (22) hood (4) according to one of claims 1 to 5, characterized in that the or at least one of the slots (30, 32) has a length greater than 5%, preferably 10%, plus preferably still 15% of the corresponding width of the cover (4).
7. Doublure (22) de capot (4) selon l'une des revendications 1 à 6, caractérisé en ce que la ou au moins une des fentes (30, 32) comprend deux bords qui sont à distance l'un de l'autre. 7. Lining (22) hood (4) according to one of claims 1 to 6, characterized in that the or at least one of the slots (30, 32) comprises two edges which are at a distance from one of the other.
8. Capot (4) de véhicule (2) comprenant une peau (20, 120) et une doublure (22) fixée sur la face interne de la peau (20, 120), caractérisé en ce que la doublure (22) est conforme à l'une des revendications 1 à 7. 8. Hood (4) of vehicle (2) comprising a skin (20, 120) and a liner (22) fixed on the inner face of the skin (20, 120), characterized in that the liner (22) is in conformity in one of claims 1 to 7.
9. Capot (4) selon la revendication 8, caractérisé en ce qu'il comprend à une partie antérieure une gâche et un support de gâche (44), la troisième partie (46, 146) du voile de la doublure (22) étant reliée, préférentiellement directement, au support de gâche (44). 9. Cover (4) according to claim 8, characterized in that it comprises at a front part a striker and a striker holder (44), the third part (46, 146) of the web of the liner (22) being connected, preferably directly, to the striker support (44).
10. Capot (4) selon l'une des revendications 8 et 9, caractérisé en ce que la deuxième partie (48, 148) de la doublure (22) comprend une première zone avec la ou les fentes (30, 32) et une deuxième zone postérieure à la première zone, la deuxième zone étant généralement inclinée vers le bas et vers l'avant par rapport à l'horizontale lorsque le capot (4) est en position sur le véhicule (2). 10. Cover (4) according to one of claims 8 and 9, characterized in that the second portion (48, 148) of the liner (22) comprises a first zone with the or slots (30, 32) and a second zone posterior to the first zone, the second zone being generally inclined downwards and forwards with respect to the horizontal when the hood (4) is in position on the vehicle (2).
PCT/FR2012/050730 2011-04-29 2012-04-04 Vehicle bonnet comprising lining that absorbs shock in the event of a pedestrian impact WO2012146851A1 (en)

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Application Number Priority Date Filing Date Title
FR1153656A FR2974557B1 (en) 2011-04-29 2011-04-29 VEHICLE COVER WITH IMPORTING LINING FOR PITCH IMPACT.
FR1153656 2011-04-29

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WO2014001688A1 (en) * 2012-06-29 2014-01-03 Renault S.A.S. Front bonnet of a motor vehicle designed for an impact with a pedestrian's hip and motor vehicle comprising such a front bonnet
CN114650936A (en) * 2019-11-13 2022-06-21 梅赛德斯-奔驰集团股份公司 Cargo compartment assembly for a front compartment of a motor vehicle closable by a front cover
FR3140609A1 (en) * 2022-10-05 2024-04-12 Psa Automobiles Sa Hood lining for motor vehicle

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CN110450859A (en) * 2019-08-27 2019-11-15 北京长城华冠汽车科技股份有限公司 A kind of automobile and its preceding cover
FR3133586A1 (en) 2022-03-21 2023-09-22 Psa Automobiles Sa Vehicle hood equipped with folding tips for head impact.
FR3137636A1 (en) * 2022-07-06 2024-01-12 Psa Automobiles Sa Internal lining for a motor vehicle bonnet, motor vehicle bonnet comprising such an internal lining and motor vehicle comprising such a bonnet

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FR2917700A1 (en) 2007-06-19 2008-12-26 Peugeot Citroen Automobiles Sa Bonnet for motor vehicle, has skin forming visible side of bonnet and liner forming reinforcement, where liner includes stair shaped section in its central part to improve dampening of central part of bonnet in case of pedestrian impact

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JP2002037129A (en) 2000-07-24 2002-02-06 Isuzu Motors Ltd Structure around engine hood lock
JP2006168653A (en) * 2004-12-20 2006-06-29 Toyota Auto Body Co Ltd Engine hood structure for automobile
JP2007223433A (en) * 2006-02-22 2007-09-06 Honda Motor Co Ltd Engine hood for vehicle
FR2917053A1 (en) * 2007-06-07 2008-12-12 Peugeot Citroen Automobiles Sa Front bonnet for motor vehicle, has shell with base, and front walls that have programmed deformation units for deforming base and front walls in case of femur shock to pedestrian, where units are constituted of flexion and folding zones
FR2917700A1 (en) 2007-06-19 2008-12-26 Peugeot Citroen Automobiles Sa Bonnet for motor vehicle, has skin forming visible side of bonnet and liner forming reinforcement, where liner includes stair shaped section in its central part to improve dampening of central part of bonnet in case of pedestrian impact

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Publication number Priority date Publication date Assignee Title
WO2014001688A1 (en) * 2012-06-29 2014-01-03 Renault S.A.S. Front bonnet of a motor vehicle designed for an impact with a pedestrian's hip and motor vehicle comprising such a front bonnet
FR2992622A1 (en) * 2012-06-29 2014-01-03 Renault Sa FRONT COVER FOR A MOTOR VEHICLE ADAPTED FOR THE SHOCK AND A MOTOR VEHICLE COMPRISING SUCH A FRONT HOOD
CN114650936A (en) * 2019-11-13 2022-06-21 梅赛德斯-奔驰集团股份公司 Cargo compartment assembly for a front compartment of a motor vehicle closable by a front cover
FR3140609A1 (en) * 2022-10-05 2024-04-12 Psa Automobiles Sa Hood lining for motor vehicle

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