Assembly for automotive bumper

Abstract

The invention relates to a motor vehicle bumper assembly (10), the assembly comprising: a bumper skin (16) having an inner surface (32), an outer surface (28) intended to form the body of the motor vehicle (10) and opposed to the inner surface (32), a concave edge (22) intended to run along a wheel arch (20) of the motor vehicle (10), the assembly further comprising a bumper skin reinforcement shell (18) against the inner surface (32) of the bumper skin (16), the reinforcement shell (18) comprising an assembly area (34) with the bumper skin (18). The assembly area (34) comprises at least one retaining hook (44) open longitudinally towards the bumper skin (16), the concave edge (22) being engaged in said retaining hook (44) in order to hold the reinforcement shell (18) relative to the bumper skin (16). Figure to be published with the abbreviation: Figure 3

Description

Title of the invention: Assembly for motor vehicle bumper

[0001] The invention relates to the field of bumper components for a motor vehicle. More specifically, the invention deals with the attachment of a bumper reinforcement element to a motor vehicle bumper skin. The invention relates to a motor vehicle bumper assembly. The invention also relates to a motor vehicle.

[0002] A motor vehicle is equipped at the front with a bumper system whose components are designed, in the event of a collision, to absorb the impact energy by deforming in a controlled manner, so as to protect the occupants of the vehicle's passenger compartment. The bumper consists of a bumper skin that covers bumper reinforcements. These bumper reinforcements increase the rigidity and strength of the bumper and serve as supports for various components, including the front light assemblies, and various radars and sensors. A bumper skin reinforcement improves its stability and limits its deformation when a user leans on the bumper skin. This aspect contributes to the perceived quality of the motor vehicle.

[0003] Bumper reinforcements are typically located at the lateral ends of the bumper. They are generally attached to the bumper skin by ultrasonic welding or vibration. This method of attachment requires specific tooling at the bumper assembly station; the personnel performing the operation must also be trained in welding. These two factors contribute to additional costs within the overall vehicle assembly costs.

[0004] The bumper skin may extend along the front sides of the vehicle, up to the level of the front wheel arches. Trim elements or accessories, such as wheel covers, may be attached to the bumper skin. These accessories serve both to decorate and enhance the perceived quality of the vehicle, and to protect it from external obstacles, including impacts and scratches. They also serve to cover weld and fastening areas of adjacent or interlocking components in order to protect these areas, give the vehicle a smooth appearance, and improve its aerodynamics.

[0005] The invention aims to address at least one of the problems or drawbacks encountered in the prior art. In particular, the invention aims to simplify the assembly of a motor vehicle. The invention also aims to optimize the assembly and assembly costs of a motor vehicle.

[0006] According to a first aspect, the invention provides an assembly for a motor vehicle bumper, the assembly comprising: a bumper skin having an inner surface, an outer surface intended to form the body of the motor vehicle and opposed to the inner surface, a concave edge intended to run along a wheel arch of the motor vehicle, the assembly further comprising a bumper skin reinforcement shell against the inner surface of the bumper skin, the reinforcement shell comprising an assembly area with the bumper skin; notable in that the assembly area comprises at least one retaining hook open longitudinally towards the bumper skin, the concave edge being engaged in said retaining hook in order to hold the reinforcement shell relative to the bumper skin.

[0007] It will be well understood that the invention proposes a bumper reinforcement, equipped with guiding and holding means allowing its longitudinal placement, then its attachment to a bumper skin without welding points, thus making it possible to omit the presence of tools adapted to the bumper assembly stage and contributing to lowering the assembly costs of a motor vehicle.

[0008] Document JP2013169930 describes an arched molding structure for a motor vehicle. This structure conceals the junction between the fender and the bumper skin of the vehicle; it is fixed by hooks.

[0009] US8844971 describes an inner fender that faces a wheel arch on one side of a bumper. The fender is attached to the bumper side by means of hooks and tabs.

[0010] Document EP2655167 describes a device for reinforcing a vehicle fender to a body structure. It is attached to the fender and the side of the vehicle body by means of hooks.

[0011] Document JP5154394 describes a bumper mounting tool of a regulated size that can be attached to a vehicle body even if the dimensions of a panel element are reduced to limit the weight of the vehicle body. The mounting tool is attached to the lower edge of a wheel arch panel by means of a claw.

[0012] While the preceding documents show elements attached to others by means of hooks or fixing claws, they do not mention the attachment of a bumper reinforcement to a bumper skin, adjoining a wheel arch, in place of weld points.

[0013] Preferably, the concave edge includes a horizontal notch, at least one retaining hook being in said horizontal notch.

[0014] Preferably, the bumper skin is a front bumper skin.

[0015] Preferably, at least one retaining hook comprises a rib horizontal engaged in the horizontal notch.

[0016] Preferably, the hook comprises a base, the horizontal notch extending from said base.

[0017] Preferably, the at least one retaining hook comprises an inner plate and an outer plate, the concave edge being transversely between the inner plate and the outer plate.

[0018] Preferably, the horizontal rib transversely connects the inner plate and the outer plate.

[0019] Preferably, the at least one retaining hook includes guide means with a section having an expansion towards the bumper skin.

[0020] Preferably, the at least one retaining hook comprises a central retaining hook, the guiding means being in said central retaining hook.

[0021] Preferably, the concave edge includes a retention relief; at least one retaining hook includes an elastic tab with a retention stop cooperating with the retention relief in order to fix the retaining hook to the concave edge.

[0022] Preferably, the at least one retaining hook has an internal width adjusted to a transverse thickness of the concave edge.

[0023] Preferably, the at least one hook comprises an upper retaining hook and a lower retaining hook having said internal width adjusted to a transverse thickness of the concave edge.

[0024] Preferably, the bumper skin comprises an upper panel and a lower panel forming the concave edge and engaged in at least one retaining hook.

[0025] Preferably, the bumper skin includes an opening, the assembly further including a protective grille in the opening, the protective grille including a fixing tab, the reinforcing shell including a fixing hole cooperating with the fixing tab transversely opposite the retaining hook.

[0026] Preferably, the assembly area comprises at least two longitudinal segments, each associated with a retaining hook, the longitudinal segments being separated vertically.

[0027] According to another aspect, the invention proposes a motor vehicle comprising a bumper assembly and at least one wheel arch, notable in that the bumper assembly conforms to the invention.

[0028] Preferably, the motor vehicle includes a concave edge trim element, the trim element including fastening means fixed to the concave edge and distributed along at least one retaining hook.

[0029] Each feature introduced by the expression "preferably" given in relation to one of the aspects of the invention applies to all other aspects of the invention.

[0030] The invention will be well understood and other aspects and advantages will become clear upon reading the following description, given with reference to the attached figures listed below.

[0031] Fig. 1 is a side view of a motor vehicle according to the invention.

[0032] Figure 2 shows an assembly for a motor vehicle bumper according to the invention.

[0033] Fig. 3 represents an exploded view of a bumper skin reinforcement shell with a motor vehicle bumper skin according to the invention.

[0034] Fig. 4 shows a vehicle reinforcement shell retaining hook according to the invention.

[0035] Fig. 5 shows a vehicle reinforcement shell retaining hook according to the invention.

[0036] Fig. 6 shows a vehicle reinforcement shell retaining hook according to the invention.

[0037] In the following description, the term "include" is synonymous with "include" and is not limiting in that it permits the presence of other elements in the motor vehicle to which it relates. It is understood that the term "include" includes the terms "consist of". The terms "external" and "internal" shall respectively designate what is oriented towards the outside of the vehicle and towards the inside of the vehicle.

[0038] In this description, the terms "longitudinal," "longitudinally," "transverse," and "transversely" are used with respect to the vehicle's frame of reference in the mounting configuration. The term "longitudinal" refers to the principal direction of travel of the vehicle. The term "transverse" refers to a direction perpendicular to the principal direction of travel of the vehicle. The term "front" refers to the principal direction of travel of the vehicle. The term "rear" refers to the opposite of the front of the vehicle.

[0039] The X-axis represents the longitudinal direction, the Y-axis represents the transverse direction, and the Z-axis represents the vertical direction of the motor vehicle. These three axes define a right-handed trihedron whose orientation is preserved throughout the figures.

[0040] In this description, the terms "vertical" and "horizontal" are not to be understood in their strict sense. Indeed, they allow an inclination of at most 20°, preferably at most 10°, more preferably at most 5°, and even more preferably at most 2°; with respect to the strict meaning of these terms.

[0041] In this description, the technical characteristics are defined in the assembly mounting configuration, unless otherwise explicitly stated.

[0042] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0043] Figure 1 represents a motor vehicle 10 according to the invention. The motor vehicle 10 comprises energy storage means and at least one motor (not shown) adapted to drive said motor vehicle 10.

[0044] The motor vehicle 10 comprises a structure 12. The structure 12 forms an outer body, or the main frame of the motor vehicle. The structure 12 delineates different compartments of the motor vehicle 10, including the passenger compartment, the cargo area, and the engine compartment (not shown). The structure 12 may be formed from an assembly of stamped and welded sheet metal. It is advantageously metallic.

[0045] The structure 12 connects various parts of the motor vehicle 10, including the openings. The structure 12 forms a mounting support for the powertrain, suspension systems, steering system, and braking systems.

[0046] The structure 12 has a front bumper, referred to as the front bumper 14, on its front face. This front face is also called the front end. The front bumper 14 comprises a bumper skin 16. The bumper skin 16 comprises an outer surface 28 intended to form the body of the motor vehicle 10 and an inner surface opposite the outer surface 28.

[0047] The front bumper 14 also includes at least one bumper skin reinforcement shell 18 with a convex surface. The reinforcement shell 18 is an internal element hidden from view by the end user of the vehicle. This element reinforces the bumper skin 16, which is visible from the outside. The bumper skin 16 is attached to the outer face of the reinforcement shell 18. The reinforcement shell 18 forms a stiffening frame.

[0048] The front bumper 14 extends transversely across the front face of the motor vehicle 10 and longitudinally along the sides of said motor vehicle 10. The front bumper 14 extends longitudinally in front of a wheel arch 20. The bumper skin 16 includes a concave edge 22. The concave edge 22 runs along the wheel arch 20. The concave edge 22 is curved. Preferably, the wheel arch 20 is a front wheel arch.

[0049] The motor vehicle 10 includes a trim element 24 for the concave edge 22. The trim element 24 may be a side fender trim. The trim element 24 covers the bumper skin 16 transversely over the concave edge. The trim element 24 conceals the concave edge 22 by running along the wheel arch 20. The trim element includes fastening means attached to the concave edge 22.

[0050] The motor vehicle 10 includes optical blocks 26. The bumper skin 16 is generally located under the optical blocks 26. According to an alternative embodiment of the invention, the optical blocks 26 pass longitudinally through the front bumper 14. The bumper skin 16 and the reinforcing shell 18 include openings adapted to allow the passage of the optical blocks 26.

[0051] Preferably, the bumper skin 16 is a front bumper skin 14.

[0052] According to an alternative embodiment of the invention, the bumper skin is a bumper skin- rear shocks.

[0053] The motor vehicle can, for example, be a private motor vehicle or a commercial motor vehicle.

[0054] Figure 2 shows a motor vehicle bumper assembly according to the invention. The motor vehicle may correspond to the one shown in relation to Figure 1.

[0055] The bumper skin 16 includes an upper panel 40 and a lower panel 42 forming the concave edge 22.

[0056] The reinforcing shell 18 includes a convex surface 30. The reinforcing shell 18 is designed to come into contact with the inner surface 32 of the bumper skin 16 and conforms to it by complementary shape. The reinforcing shell 18 includes an assembly area 34 with the bumper skin 16. The assembly area 34 is against the concave edge 22. It is vertical. The assembly area 34 conforms to and / or runs along the concave edge 22. The assembly area 34 is against the lower panel 42 and the upper panel 40.

[0057] The reinforcing shell 18 has an extended, curved shape corresponding to that of the internal surface 32. The reinforcing shell 18 forms an internal reinforcing partition, or a reinforcing substructure for the bumper skin. It has a constant thickness. The reinforcing shell 18 includes first openings 36. The bumper skin 16 includes second openings 38. The first openings 36 and the second openings 38 can be superimposed. The superimposed first openings 36 and second openings 38 can have different sizes. They are configured to allow elements such as sensors or headlights to protrude through the front bumper 14.

[0058] The assembly area 34 includes at least one retaining hook 44 open longitudinally towards the bumper skin 16. In this case, at least one The retaining hook 44 is open forward. The concave edge 22 is engaged in at least one retaining hook 44 to hold the reinforcing shell 18 relative to the bumper skin 16. The at least one retaining hook 44 interacts with the lower panel 42 and the upper panel 40. The reinforcing shell 18 connects the lower panel 42 and the upper panel 40.

[0059] Preferably, the assembly area 34 includes at least three retaining hooks 44, spaced apart from each other, against the concave edge 22. The fastening means 98 of the trim element are distributed along at least one hook on the concave edge 22. The fastening means 98 include, for example, fastening tabs inserted into slots in the side wing.

[0060] The reinforcement shell 18 includes fastening elements 46 transversely at a distance from the assembly area 34. Said fastening elements 46 permanently fix the reinforcement shell 18 to the bumper skin 16. They may include, for example, screws, rivets or elastic blades with stops.

[0061] The bumper skin 16 includes an opening 50. The opening 50 is transversely opposite the concave edge 22. The opening 50 is a central opening. The opening 50 serves as an air intake for cooling a powertrain and / or for supplying outside air to an air conditioning system, for example. A protective grille 52 covers said opening 50. The protective grille 52 is attached to the reinforcing shell 18 by a fastening tab 54. The reinforcing shell 18 includes a fastening hole 56 cooperating with the fastening tab 54. The fastening hole 56 is transversely opposite the retaining hook(s) 44. The fastening hole 56 is longitudinally in front of the retaining hook(s) 44.

[0062] The retaining hooks 44 serve to pre-hold the reinforcing shell 18 against the bumper skin 16, so as to position the fasteners 46 correctly before engaging them. It is no longer necessary to weld the reinforcing shell 18 to the bumper skin 16 to secure them.

[0063] Figure 3 shows an exploded view of an assembly comprising a reinforcing shell 18 and a bumper skin 16 of a motor vehicle. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 2. The retaining hooks 44 and the reinforcing shell 18 are made of the same material.

[0064] For clarity, the reinforcing shell 18 is placed opposite and at a distance from the bumper skin 16 in order to illustrate the different components interacting together.

[0065] The retaining hooks 44 can be of various configurations. The configuration of a retaining hook 44 is adapted according to the conformation of the concave edge 22 at the precise point where the retaining hook 44 engages said concave edge. 22. The at least one retaining hook 44 has an internal width adjusted to a transverse thickness of the concave edge 22. For example, the at least one retaining hook 44 comprises an upper retaining hook 68, a central retaining hook 76 and a lower retaining hook 70 having said internal width adjusted to a transverse thickness of the concave edge 22. Preferably, the at least one retaining hook 44 comprises two central retaining hooks 76 between the upper retaining hook 68 and the lower retaining hook 70.

[0066] At least one, preferably each retaining hook 44 comprises an inner plate 58 and an outer plate 60. These form a clamp gripping the concave edge. The outer plate 60 forms a retaining tab. The concave edge 22 is transversely located between the inner plate 58 and the outer plate 60. The inner plate 58 is transversely aligned with the outer plate 60. They are parallel.

[0067] At least one retaining hook 44 interacts with the bumper skin 16. It is retained longitudinally against at least one retention ridge 62 of the corresponding bumper skin 16. The concave edge 22 includes at least one retention ridge 62. There are as many retention ridges 62 as there are retaining hooks 44. The at least one retention ridge 62 may be, for example, a slot or an opening through the concave edge 22; or a boss projecting from the concave edge 22.

[0068] Each retention relief 62 is inserted into the corresponding retaining hook 44 when the retaining hook 44 is fitted onto the concave edge 22. The retention relief 62 is located between the inner plate 58 and the outer plate 60. At least one retaining hook 44 comprises an elastic tab 64 with a retention stop 66 cooperating with the retention relief 62 in order to join the retaining hook 44 to the concave edge 22. The elastic tab 64 is on the outer plate 60.

[0069] The assembly of the reinforcement shell 18 on the bumper skin 16 is carried out by means of a longitudinal movement of the reinforcement shell 18. The retaining hooks 44 engage the retention ridges 62 so as to secure the assembly area 34, via the retaining hooks 44, with the concave edge 22.

[0070] The assembly area 34 has several longitudinal segments, each of these longitudinal segments ending in a retaining hook 44. The longitudinal segments are vertically spaced. Thus, they leave certain sections of the concave edge 22 accessible, which allows the cladding element to be attached there subsequently.

[0071] Figure 4 shows an exploded view of a retaining hook 44 of a reinforcing shell 18 and a concave edge 22 of a motor vehicle, according to one embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of figures 1 to 3.

[0072] The at least one retaining hook 44 includes guide means 72 allowing precise positioning of the reinforcing shell 18 on the concave edge 22 during assembly. The guide means 72 differ depending on the retaining hook 44 considered and its position against the concave edge 22. The guide means 72 are located in the recess of the retaining hook 44.

[0073] The concave edge 22 includes positioning means 74, complementary to the guiding means 72. The positioning means 74 include a horizontal notch 78, at least one retaining hook 44 being in said horizontal notch 78. In the present illustration, the retaining hook 44 is a central retaining hook 76.

[0074] The guiding means 72 include a section 80 having a widening 90 towards the bumper skin 16, in this case towards the front. The section is a longitudinal section. The retaining hook 44 includes a transverse joint 100. The transverse joint 100 connects the inner plate 58 and the outer plate 60. The transverse joint 100 forms a horizontal rib 82. The horizontal rib 82 joins the inner plate 58 and the outer plate 60. The horizontal rib 82 is engaged in the horizontal notch 78. The transverse joint 100 is hollow. It has a transverse groove. The horizontal notch 78 has a bearing surface 84 and a back 86. The horizontal rib 82 includes a bottom 88. The bottom 88 is adapted to abut against the back 86 to ensure longitudinal positioning. The horizontal notch 78 extends from said bottom 88. The horizontal rib 82 rests on the bearing surface 84.

[0075] During assembly, the central retaining hook 76 is pushed longitudinally into the horizontal notch 78. The enlargement 90 guides the concave edge 22 into the retaining hook 44 during assembly. The enlargement 90 is formed by the inner plate 58 and the outer plate 60. It is delimited by the horizontal rib 82, which is designed to slide in the horizontal notch 78 until the bottom 88 touches the back 86. The horizontal rib 82 fits into the horizontal notch 78 and rests against the bearing surface 84. These surfaces are complementary. At least one retaining hook 44 has an internal width adjusted to a transverse thickness of the concave edge 22.

[0076] Figure 5 shows a reinforcement shell retaining hook for a motor vehicle, according to the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 4.

[0077] The guiding means 72 comprise a horizontal rib 82 between the inner plate 58 and the outer plate 60. The horizontal rib 82 extends from the Transverse junction 100. The horizontal rib 82 extends along the inner plate 58. The horizontal rib 82 is transversely spaced at a distance from the outer plate 60. The horizontal rib 82 is designed to fit into a horizontal notch in the concave edge. According to an alternative embodiment of the invention, the concave edge fits between the horizontal rib and the outer plate.

[0078] The outer plate 60 carries or forms an elastic tab 64 with a retention stop 66. The inner plate 58 and the outer plate 60 are configured to pinch the concave edge. The retention stop 66 is designed to cooperate with the retention relief carried by the concave edge to fix the retaining hook 44 to the concave edge.

[0079] In the present illustration, the retaining hook 44 is an upper retaining hook 68. The retaining hook 44 has a section 80 with an expansion 90.

[0080] Figure 6 shows a vehicle reinforcement shell retaining hook automobile, according to an embodiment of the invention. The motor vehicle may correspond to that shown in relation to one of Figures 1 to 5.

[0081] The reinforcing shell 18 includes a guide stud 92. The guide stud 92 extends from the convex surface 30 of the reinforcing shell 18 towards the bumper skin. The guide stud 92 includes an upper face 96. The guide stud 92 projects transversely. It is associated with one of the retaining hooks 44. The retaining hook 44 is open towards the guide stud 92.

[0082] The inner plate 58 extends from the upper face 96 to form the retaining hook 44. The guiding means 72 include a horizontal rib 82 extending between the inner plate 58 and the outer plate 60. The horizontal rib 82 extends from the transverse junction 100 towards the guide stud 92. The horizontal rib 82 extends along the inner plate 58. The horizontal rib 82 is transversely spaced away from the outer plate 60. The horizontal rib 82 is designed to fit into a horizontal notch in the concave edge.

[0083] In the present illustration, the retaining hook 44 is a lower retaining hook 70. The lower retaining hook 70 is longitudinally behind the guide block 92. The retaining hook 44 has a section 80 with a widening 90. The outer plate 60 has a longitudinal segment and a segment inclined relative to the latter. The inclined segment forms the widening.

[0084] During assembly, the upper face 96 is applied against the concave edge and the reinforcing shell 18 is pushed forward so that the horizontal rib 82 engages in the corresponding horizontal notch, until the inner plate 58 and the outer plate 60 pinch the concave edge.

[0085] According to a preferred embodiment, the reinforcing shell is made of a plastic or composite material, and the reinforcing shell is produced by molding. The plastic material may be a thermoplastic or a thermosetting material. According to a preferred embodiment, the plastic material is selected from the group comprising polypropylene, polyamide, polyphthalamide, polyetheretherketone, polyphenylene sulfide, polyamide-imide, polyetherimide, polyarylamide, polyepoxide, unsaturated polyester, vinyl ester, or polyester-vinylester resins. For example, the composite material comprises a matrix of a plastic material as described above with reinforcement. For example, the reinforcement comprises glass or carbon fibers.

[0086] The reinforcement shell comprises at least 10% by weight of recycled plastic material based on the total weight of the plastic material; preferably from 10 to 80% by weight; more preferably from 20 to 60% by weight or from 30 to 40% by weight. The use of recycled plastic material reduces the vehicle's environmental footprint.

[0087] The invention comprises the combination of all the embodiments illustrated by all the figures.

[0088] Figures 2 to 6 are isometric views. Each one respects a specific scale, real angles and real proportions.

Claims

Demands

1. Assembly for motor vehicle bumper (10), the assembly comprising: a bumper skin (16) having an inner surface (32), an outer surface (28) intended to form the body of the motor vehicle (10) and opposed to the inner surface (32), a concave edge (22) intended to run along a wheel arch (20) of the motor vehicle (10), the assembly further comprising a bumper skin reinforcement shell (18) against the inner surface (32) of the bumper skin (16), the reinforcement shell (18) comprising an assembly area (34) with the bumper skin (16); characterized in that the assembly area (34) includes at least one retaining hook (44) open longitudinally towards the bumper skin (16), the concave edge (22) being engaged in said retaining hook (44) in order to hold the reinforcement shell (18) relative to the bumper skin (16).

2. Assembly according to claim 1, characterized in that the concave edge (22) comprises a horizontal notch (78), at least one retaining hook (44) being in said horizontal notch (78); preferably, the bumper skin (16) is a front bumper skin.

3. Assembly according to the preceding claims, characterized in that at least one retaining hook (44) comprises a horizontal rib (82) engaged in the horizontal notch (78); preferably, the retaining hook (44) comprises a base (88), the horizontal notch (78) extending from said base (88).

4. Assembly according to the preceding claims, characterized in that the at least one retaining hook (44) comprises an inner plate (58) and an outer plate (60), the concave edge (22) being transversely between the inner plate (58) and the outer plate (60).

5. Assembly according to the preceding claims, characterized in that the at least one retaining hook (44) comprises guide means (72) with a section (80) having an enlargement (90) towards the bumper skin (16); preferably, the at least one retaining hook (44) comprises a central retaining hook (76), the guide means (72) being in said central retaining hook (76).

6. Assembly according to the preceding claims, characterized in that the concave edge (22) comprises a retention relief (62); the at least one retaining hook (44) comprises an elastic tab (64) with a retention stop (66) cooperating with the retention relief (62) in order to fix the retaining hook (44) to the concave edge (22).

7. Assembly according to the preceding claims, characterized in that the at least one retaining hook (44) has an internal width adjusted to a transverse thickness of the concave edge (22); preferably, the at least one retaining hook (44) comprises an upper retaining hook (68) and a lower retaining hook (70) having said internal width adjusted to a transverse thickness of the concave edge (22).

8. Assembly according to the preceding claims, characterized in that the bumper skin (16) comprises an upper panel (40) and a lower panel (42) forming the concave edge (22) and engaged in at least one retaining hook (44).

9. Assembly according to the preceding claims, characterized in that the bumper skin (16) includes an opening (50), the assembly further comprising a protective grille (52) in the opening (50), the protective grille (52) comprising a fixing tab (54), the reinforcing shell (18) comprising a fixing orifice (56) cooperating with the fixing tab (54) transversely opposite the retaining hook (44).

10. Motor vehicle (10) comprising a bumper assembly and at least one wheel arch (20), characterized in that the bumper assembly conforms to any one of claims 1 to 9; preferably, the motor vehicle (10) comprises a trim element (24) of the concave edge (22), the trim element (24) comprising fastening means (98) fixed to the concave edge (22) and distributed along at least one retaining hook (44).

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