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
  • 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
  • B62D25/12—Parts or details thereof
• • 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 present invention relates to a motor vehicle cover. It relates in particular to a stiffener for a motor vehicle bonnet. It finds particular application in the impact behavior of the vehicle bonnet. It also relates to a motor vehicle comprising a bonnet according to the invention TECHNOLOGICAL BACKGROUND OF THE INVENTION
• femur shock causes serious and in some cases irreversible lesions in the event that the system dedicated to a femur shock undergoes stresses from forces and moments that are too high.
• the object of the invention is to provide a front bonnet for a motor vehicle, the design of which, and in particular an optimized stiffness of the front part of the bonnet, makes it possible to meet pedestrian protection standards, in particular for pedestrian impacts of the femur type.
• the subject of the invention is therefore a front bonnet for a motor vehicle comprising: an outer skin and a lining comprising a bottom wall spaced from the outer skin, the bonnet comprising a front edge and an opposite rear edge, two side edges connecting the front and rear edges on either side of the hood, a stiffener between the outer skin and the lining
• said cover being characterized in that it comprises an absorption edge corresponding to at least part of the front edge of the cover located on either side of a middle zone of said front edge, the absorption edge being between the stiffener and the front edge of the bonnet, so that the stiffness of the absorption edge in a longitudinal direction, the longitudinal direction corresponding to the longitudinal direction of the vehicle once the bonnet is installed on the vehicle, in the direction of the front edge towards the rear edge of said cowl, along said absorption edge, is lower than the rigidity, in this longitudinal direction, of the middle zone of said front edge.
• the invention contributes to the vehicle having a sufficient absorption stroke for at least part of the zone provided behind the impact zone located between the top of the front bumper and the nose of the bonnet in the case of a femur shock. This reduces the difference in rigidity between the front of the bonnet and the top of the bumper and/or the grille, the rigidity of the bonnet being stiffer before the invention.
• the absorption edge extends on either side of the middle zone of said front edge as far as the side edges of the cover.
• the absorption zones at the front of the vehicle are preferred, located more on the sides of the vehicle than in the center, which corresponds to usual cases where an avoidance has occurred during the pedestrian impact.
• the rigidity of the absorption edge decreases from the middle zone towards the side edges.
• the stiffener comprises a front edge extending from the side of the front edge of the cover, said front edge of the stiffener comprising a central part and two side parts arranged on either side of the central part, the central part of the stiffener being opposite the middle zone, and the lateral zones of the stiffener being arranged opposite the absorption edge of the cowl, the central part of the said front edge of the stiffener being arranged closer to the front edge of the cover than the two lateral parts of the front edge.
• the cover comprises a striker wire fixed to the facing lining facing the central part of the stiffener.
• the lateral parts of the front edge of the stiffener comprise, on each side of the central part, at least two segments, a first segment connected to the central part and a second segment between the first segment and the side edge of the cowl, the front edge of the stiffener in the second segment being arranged further towards the rear edge of the cowl than the front edge of the stiffener in the first segment.
• the front edge of the stiffener comprises: A first connecting portion between the front edge in the central part of the stiffener and the first segment,
• each connecting portion forms an acute angle (a1, a2) between zero degrees and sixty degrees relative to a longitudinal and vertical plane of the vehicle when the hood is installed on said vehicle, the vertex of the angle corresponding to the point of each connecting portion closest to the front edge of the bonnet of each connecting portion.
• the dimension of the stiffener in the longitudinal direction is reduced as it moves away from the central part towards the side edges of the cover.
• the invention also relates to a vehicle comprising a bonnet according to the invention.
• FIG.1 shows a top view of a flap in which the outer skin has been removed.
• FIG.2 schematically represents a top view of a stiffener according to the invention.
• the X direction is the longitudinal axis of the vehicle in running order.
• the Y direction is the transverse direction of the vehicle in running order.
• the Z direction is the vertical of the vehicle oriented upwards.
• front refers to the front of the vehicle and rear refers to the rear of the vehicle in running order.
• Figure 1 schematically shows a view of a vehicle front cover according to the invention, comprising an outer skin, a liner 2 and a stiffener 3, with in this view the outer skin which is not shown.
• the front bonnet for a motor vehicle comprising: an outer skin and a lining 2 comprising a bottom wall 21 spaced from the outer skin, the bonnet 100 comprising a front edge 101 and an opposite rear edge, two side edges 103, 104, connecting the front and rear edges on either side of the cover.
• the front cover further comprises a stiffener 3 placed between the outer skin and the lining 2.
• the cover 100 comprises an absorption edge 111 corresponding to at least a part of the front edge 101 of the cover, located on either side of a middle zone 110 of said front edge 101 .
• the absorption edge 111 being located between the stiffener 3 and the front edge 101 of the bonnet, so that the rigidity of the bonnet in a longitudinal direction, the longitudinal direction corresponding to the longitudinal direction X of the vehicle once the bonnet 100 installed on the vehicle, in the direction from the front edge to the rear edge of said bonnet 100, along said absorption edge 111, is lower than the rigidity in this longitudinal direction of the middle zone 110 of said front edge 101 .
• the stiffener 3 arranged between the outer skin of the bonnet and the lining 2 makes it possible to stiffen the bonnet 100 with respect to aerodynamic forces, in particular when the vehicle is moving.
• the stiffener has the particular function of preventing visible vibrations of the outer skin of the bonnet.
• the stiffener 3 comprises fixing lugs 32 extending from a main body of the stiffener 3, in the form of a plate, in the direction of the lining 2.
• the stiffener 3 is fixed to the lining 2 by clinching at the ends of the fixing lugs 32.
• the stiffener 3 also has the function of providing energy absorption means during a vertical head impact on the hood, in particular in the middle part 110 and at the hood front.
• the rigidities of the fixing lugs 32 are chosen to bend from a certain force so as to absorb the energy of a vertical head impact.
• the stiffener 3 is fixed to the outer skin by bonding zones 31 .
• the absorption edge 111 extends on either side of a middle zone 110 of said front edge 101 as far as the side edges 103, 104 of the cover.
• the terms "up to the side edges” mean that the side edges of the absorption edge, that is to say the edges furthest transversely from the longitudinal axis in the middle of the vehicle and located vis-à-vis the side edges of the cover 103, 104, are closest to the fixing zone of the liner with the outer skin, for example by crimping, but without interfering with the fixing or the crimping of the liner 2 with the outer skin.
• the absorption edge 111 extends on either side of a middle zone 110 of said front edge 101 "up to proximity" to the side edges 103, 104 of the cover.
• the terms "up to proximity” mean that the lateral ends of the stiffener stop in the transverse direction when the lining 2 rises upwards in the direction of the outer skin, the cowl 100 being in the vehicle position, so so that the stiffener 3 can play its role of absorbing head impact energy.
• the stiffener 3 comprises a front edge 301 extending from the side of the front edge of the cover 101, comprising a central part 310 and two side parts 311 arranged on either side of the central part 310, the central part 310 of said front edge of the stiffener 301 being arranged closer to the front edge of the bonnet than the two lateral parts 311 of the front edge of the bonnet, the central part being opposite the middle zone 110.
• the two side parts of the stiffener 311 extend as far as the side edges 103, 104 of the cover.
• the terms "up to the side edges” means that the side ends of the side parts 311 of the stiffener 3, that is to say the side ends of the parts 311 of the stiffener 3 furthest transversely from the longitudinal axis in the middle of the vehicle and located vis-à-vis the side edges 103, 104 of the bonnet, are as close as possible to the zone for fixing the lining with the outer skin, for example by crimping, but without interfering with the fixing or crimping the liner with the outer skin, being a few centimeters from the crimping zone, for example less than ten centimeters, preferably less than five centimeters, from the side edges of the cover.
• zones 31 for fixing the stiffener by bonding to the outer skin of the cowl are located close to the lateral ends of the stiffener 3 thus approaching as close as possible to the crimping zone of the lining to the outer skin, so as to prevent vibrations of the outer skin of the hood 100 under aerodynamic forces when the vehicle is moving.
• the cover 100 comprises a striker wire fixed to the lining 2 opposite the zone 110 in the middle of the front edge 101 of the cover.
• the central part 310 of the stiffener 3 is closer to the front edge 101 of the cowl than on either side of this middle zone 110.
• the stiffener 3 closer to the front edge in this middle zone 110 of the hood makes it possible to improve the behavior of the hood 100 during a vertical head impact on the hood in this middle zone 110, by providing means of energy absorption, and also allowing it to limit the stroke of head during a head impact in the direction of the striker and the lock hook when the bonnet is fitted to the vehicle.
• the front edge 301 of the central part of the stiffener 310 is as close as possible to the crimping zone between the liner 2 and the outer skin in the middle zone 110, without interfering with the crimping operations, of the liner with the outer skin.
• a bonding zone between the stiffener 3 and the outer skin is located at the limit of the front edge of the central part 310 of the stiffener.
• the lateral parts 311 of the front edge of the stiffener 3 comprise, on each side of the central part, at least two segments S1, S2, a first segment S1 connected to the central part 310 and a second segment S2 between the first segment and the side edge of the cover, the front edge of the stiffener in the second segment S2 being closer to the rear edge of the cover 100 than the front edge of the stiffener in the first segment S1.
• the front edge 301 of the stiffener has a staircase shape, with each step comprising a segment arranged closer to the rear edge of the cowl than the previous one closer to the central part 310 of the stiffener.
• the stiffener 3 comprises at the level of each segment a fixing lug 32, extending in the direction of the lining 2, with the end of the fixing lug 32 distal from the body of the stiffener which is for example fixed by clinching to the lining
• the front edge of the stiffener 3 comprises:
• each connecting portion L1, L2 forms an acute angle (a1, a2) between zero degrees and seventy-five degrees with respect to a longitudinal and vertical plane of the vehicle when the bonnet 100 is installed on said vehicle, the apex of the angle corresponding to the point of each connecting portion closest to the front edge of the hood.
• the angle between each connecting portion and a longitudinal and vertical plane of the vehicle is therefore acute and open towards the rear of the vehicle.
• each step comprises successively, starting from the central part of the stiffener, a connecting portion followed by a segment, which thus forms a step.
• This succession of steps contributes in a simple way to keeping the front edge 311 of the stiffener at a good distance from the front edge of the bonnet, and to promote a longitudinal absorption stroke during a pedestrian impact, in particular for a femur impact.
• the dimension of the stiffener in the longitudinal direction is reduced as it moves away from the central part towards the side edges 103, 104 of the cover.
• the rigidity in the longitudinal direction of the stiffener 3 decreases as a function of the lateral distance to the central part 310, that is to say by approaching the side edges 103, 104, of the cowl, which contributes to to reduce the longitudinal rigidity of the bonnet as a function of the distance from the middle zone of the bonnet and to promote a longitudinal absorption stroke during a pedestrian impact, in particular for a femur impact.
• the stiffener 3 comprises a first connecting portion L1 on the front edge of the stiffener 23 starting at a distance d1 of the order of 180 millimeters to 190 millimeters in transverse with respect to the middle of the front edge 101 of the cover, this first portion forming an angle b1 close to 50° with respect to a longitudinal and vertical plane, in a sub-variant b1 is equal to 54°.
• This first connecting portion L1 is followed by a first segment S1 making an angle a1 close to 80° with respect to a longitudinal and vertical plane, in a sub-variant a1 is equal to 85°.
• the end of the first segment S1 closest to the side edge of the bonnet is at approximately a distance d2 of the order of 450 millimeters with respect to the middle of the front edge 101 of the bonnet, in a sub-variant d2 is equal to 430 millimeters.
• This first segment S1 is followed by a second connecting portion L2 forming an angle b2 close to 50° with respect to a longitudinal and vertical plane, in a sub-variant b2 is equal to 44°.
• This second connecting portion L2 is followed by a second segment S2 making an angle a2 close to 75° with respect to a longitudinal and vertical plane, in an above-variant a2 is equal to 80°.
• the invention also relates to a vehicle comprising a bonnet according to the invention.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=75953884

Family Applications (1)

Country Status (3)

Family Cites Families (6)

• 2020
  • 2020-11-06 FR FR2011416A patent/FR3116038A1/fr not_active Withdrawn
• 2021
  • 2021-10-20 WO PCT/FR2021/051840 patent/WO2022096796A1/fr unknown
  • 2021-10-20 EP EP21806313.9A patent/EP4240636A1/de not_active Withdrawn

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