Mounting of frame and lights on the bumper crossmember of a motor vehicle

Abstract

The invention relates to a front fascia assembly for a motor vehicle, the assembly comprising: a front crossmember (16) with a mounting surface (44); a lighting device (28) with a first positioning arm (42) comprising a first horizontally extending support surface (46); a bumper skin; a bumper skin retaining bracket (30), the retaining bracket comprising a second positioning arm (38) with a second support surface (48) against the first support surface above the mounting surface (44) of the front crossmember (16). The first and second support surfaces each comprise a longitudinal guide chamfer (52) adapted to cooperate with the other chamfer of the first support surface (46) and the second support surface (48) during the assembly of the retaining bracket (30) with the lighting device (28). Figure to be published with the abstract: Figure 3

Description

Title of the invention: Fixing of frame and lights on bumper crossmember of motor vehicle

[0001] The invention relates to a front fascia architecture for a motor vehicle. The invention concerns the assembly of a front fascia for a motor vehicle. More specifically, the invention relates to a front fascia assembly for a motor vehicle. The invention also relates to a motor vehicle.

[0002] At the front, a motor vehicle generally has a bumper skin, two headlights arranged laterally, and a hood whose front part, conventionally called the hood nose, is close to the upper part of the bumper skin. Two bumper crossmembers are located behind the bumper skin, that is, between the vehicle structure and the bumper skin. The upper crossmember is connected to the vehicle structure by energy absorbers conventionally called "crash boxes." The absorbers are, for example, connected to the two front frame rails of the vehicle. The lower crossmember is connected to the lower track of the structure.

[0003] The bumper skin extends above the bumper crossmember, i.e., to a greater height when viewed from the vehicle's frame of reference. It is mounted to the structure, in this case the upper crossmember, by means of a frame. This bumper frame is a rigid element against which the bumper skin rests, and in particular the portion of the bumper skin located above the bumper crossmember. It helps to maintain the shape of the bumper skin, which is generally made of a thin piece of flexible plastic material.

[0004] The frame provides rigidity to this bumper skin so that when a user leans on it, the bumper skin remains in place because it does not compress, giving an impression of solidity. The frame limits the recoil effect. Furthermore, this rigidity of the bumper frame allows for the attachment of accessories, such as a horn or electrical wiring harnesses.

[0005] The rigidity of this bumper frame is a disadvantage in the event of a frontal collision with a pedestrian. Indeed, it generates hard points in the event of a collision with a pedestrian, creating significant forces on the pedestrian, particularly on the femur for an adult or on the head of a child.

[0006] Document FR3114551A1 describes a vehicle having at the front a bumper crossmember extending in a direction transverse to the vehicle, a bumper skin, a bumper frame disposed on the side of the bumper skin oriented towards the interior of the vehicle, characterized in that the frame has a retaining interface cooperating with a support fixed to the crossmember, the frame resting vertically on the support by its retaining interface, so as to prevent said armature from moving along the vertical direction of the vehicle and downwards from the vehicle, while allowing free movement of the retaining interface in a longitudinal direction to the vehicle.

[0007] 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 front end panel for a motor vehicle. The invention also aims to optimize the assembly and safety of a front end panel for a motor vehicle.

[0008] According to a first aspect, the invention provides an assembly for the front facade of a motor vehicle, the assembly comprising: a front crossmember with a fixing surface; a lighting device with a first positioning arm comprising a first bearing surface extending horizontally; a bumper skin; a bumper skin retaining frame, the retaining frame comprising a second positioning arm with a second bearing surface against the first bearing surface above the fixing surface of the front crossmember; notable in that at least one of the first bearing surface and the second bearing surface comprises a longitudinal guide chamfer adapted to cooperate with the other of the first bearing surface and the second bearing surface during the assembly of the retaining frame with the lighting device.

[0009] The presence of one or more chamfers allows for vertical guidance during the longitudinal joining of the arms relative to each other. Thus, this adaptation of the support interface provides assembly assistance, thereby facilitating the assembly operation for an operator.

[0010] In other words, at least one of the first positioning branch and the second positioning branch includes a chamfered surface extending its bearing surface in order to cooperate with the bearing surface of the other of the first positioning branch and the second positioning branch when assembling the retaining armature with the lighting device.

[0011] Document CN218229160U describes a motor vehicle with a mounting structure for a headlight, a front bumper, and a fender. The structure includes a side fender mounting bracket. The fender mounting bracket has four mounting surfaces. However, this document does not provide a solution for a bumper skin retaining frame.

[0012] Preferably, each of the first and second bearing surfaces includes a longitudinal guide chamfer; the first bearing surface comprising a first guide chamfer, and the second bearing surface including a second guiding chamfer longitudinally opposite to the first guiding chamfer.

[0013] Preferably, the first positioning arm includes a clearance with a height, fastening means which are fixed to the fastening surface of the front crossmember and which are adjacent to the clearance; the first guide chamfer extends vertically over the entire height of the clearance.

[0014] Preferably, the height of the clearance is between 5 mm and 15 mm; the first bearing surface is split transversely by the clearance.

[0015] Preferably, the second positioning arm comprises a vertical pillar and a longitudinal stud extending longitudinally from the vertical pillar to the first positioning arm; the second guiding chamfer being formed by the longitudinal stud.

[0016] Preferably, the second guiding chamfer extends transversely over the entire width of the longitudinal block and the second positioning arm includes a wing extending vertically under the longitudinal block.

[0017] Preferably, the assembly comprises a longitudinal direction, each longitudinal guide chamfer is inclined with respect to the longitudinal direction by an angle of inclination between 20° and 60°; more preferably between 30° and 50°.

[0018] Preferably, the front cross member includes a vertical extension forming the fixing surface.

[0019] Preferably, the first bearing surface is vertically between the fixing surface and the second bearing surface.

[0020] Preferably, the first positioning branch comprises a front section forming the first support surface, and a rear section inclined relative to the front section.

[0021] Preferably, the support frame comprises a central body, the second positioning arm extending transversely from said central body.

[0022] Preferably, the first bearing surface is under the second bearing surface.

[0023] Preferably, the second positioning branch is in front of the first positioning branch.

[0024] Preferably, the front cross member is an upper cross member, the assembly further comprising a lower cross member under the upper cross member.

[0025] Preferably, the first support surface comprises a first transverse edge, the second support surface comprises a second transverse edge, and at least one of the first positioning branch and the second positioning branch comprises an inclined surface extending from the first transverse edge or the second transverse edge, said inclined surface forming the guide chamfer and being inclined with respect to the horizontal direction.

[0026] Preferably, the first guide chamfer extends vertically at least over half the vertical thickness of the front section.

[0027] Preferably, the fixing bracket includes a clearance with a height and fixing means in the clearance, the longitudinal guide chamfer extends vertically over the entire height of said clearance.

[0028] Preferably, the lower wing extends vertically at the level of the first positioning branch.

[0029] According to another aspect, the invention provides an assembly for the front fascia of a motor vehicle, the assembly comprising a lighting device with a first positioning arm including a first support surface; a bumper skin; a bumper skin retaining frame, the retaining frame including a second positioning arm with a second support surface; a front crossmember with a mounting surface; notable in that the second positioning arm includes a vertical pillar and a longitudinal stud extending longitudinally from the vertical pillar towards the first positioning arm in order to keep it at a distance from the vertical pillar. This assembly adds a longitudinal gap between the two arms. Thus, it improves safety since it limits the occurrence of hard spots in the event of a pedestrian collision.

[0030] According to another aspect, the invention proposes a motor vehicle comprising an assembly, remarkable in that the assembly conforms to the invention.

[0031] Preferably, the bumper skin includes a central air inlet opening vertically between the front crossmember and the retaining frame, the central air inlet opening being transversely distant at most 15 mm from the lighting device.

[0032] Preferably, the lighting device includes a protective housing, the retaining frame extends transversely along said protective housing.

[0033] 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.

[0034] 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.

[0035] Fig. 1 is a front view of a motor vehicle according to the invention.

[0036] Figure [Fig. 2] is a front view of a bumper skin retaining frame motor vehicle according to the invention.

[0037] Fig. 3 is an interior view of a front-end assembly for a motor vehicle according to the invention.

[0038] Fig. 4 is a front view of a first positioning branch of a motor vehicle lighting device according to the invention.

[0039] Fig. 5 is viewed from below from the rear of a second positioning arm of a motor vehicle support frame according to the invention.

[0040] Fig. 6 illustrates the assembly movement of the second positioning arm on the first positioning arm of a front fascia assembly for a motor vehicle.

[0041] 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 or the assembly 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 directed outward from the vehicle and inward from the vehicle.

[0042] 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.

[0043] 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.

[0044] In this description, the ranges of values ​​include the bounds that delimit them.

[0045] In the present description, the equality between the values ​​is not to be understood in the strict sense insofar as each equality allows a variation of at most 10%, preferably at most 5%, more preferably at most 2%, between these values.

[0046] 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.

[0047] In this description, the technical characteristics are defined in the assembly mounting configuration, unless otherwise explicitly stated.

[0048] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0049] Figure 1 represents a motor vehicle 10, according to an embodiment of the invention. The motor vehicle 10 comprises energy storage means and at least one motor (not shown) adapted to drive said motor vehicle 10.

[0050] 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 delimits different compartments of the motor vehicle 10, including the front compartment, which is optionally an engine compartment.

[0051] The structure 12 connects various parts of the motor vehicle 10. The structure 12 forms a mounting support for the powertrain, suspension systems, and front fascia. At the front, the structure includes front side members 14. The front side members 14 extend into the front compartment. The front side members 14 may be front crossmembers.

[0052] The structure 12 further includes a front cross member 16. The front cross member 16 forms a front beam. It is located at the front end of the structure 12. It is attached to the front ends of the front side members 14. In the event of a frontal collision, the front cross member 16 absorbs the impact energy by deforming and transmits part of the impact energy to the rest of the structure 12 via the front side members 14. The front cross member 16 contributes to safety.

[0053] The front crossmember 16 is a laterally extending transverse beam. The front crossmember 16 reduces the risk of intrusion from obstacles during a frontal collision. The front crossmember 16 is capable of plastic deformation upon impact at high speed, for example, at least 50 km / h. This results in more gradual deceleration, thus reducing the likelihood of injury to passengers. It comprises a metal profile, for example, made of steel or aluminum. Other alloys are being considered to increase its capacity to absorb impact energy. The front crossmember 16 is preferably combined with a shock absorber that forms a foam body covering it transversely.

[0054] The motor vehicle 10 has a front end 18. The front end 18 forms the body of the motor vehicle 10. The front end 18 incorporates a bumper system 20, preferably a front bumper system. The front end 18, in particular each of its components, is adapted to withstand impacts at speeds up to 10 km / h, preferably up to 15 km / h, without the need to replace specific parts of the motor vehicle. Such an impact is understood to be a low-speed impact. A low-speed impact can be a parking impact, i.e., at a speed of 4 km / h. The front end 18 is also designed to limit the importance of injuries in the event of a pedestrian collision; particularly at leg level.

[0055] The front fascia 18 includes a bumper skin 22. The bumper skin 22 forms the body, i.e., the outer shell of the motor vehicle 10. The bumper skin 22 is located under the front hood. The bumper skin 22 includes at least one outer panel attached to the structure 12. The bumper skin 22 includes at least one central air intake opening 24. The central opening 24 communicates with a cooling system. The central opening is equipped with a protective grille 26. The protective grille 26 is attached to the bumper skin 22.

[0056] The front fascia 18 includes lighting devices 28. Each lighting device 28 is designed to illuminate the surroundings and be seen by other road users. It is a regulatory device. It is also called a headlight or front projector. The lighting devices 28 are embedded in the bumper skin 22. They are arranged on either side of the central opening 24. Each lighting device 28 includes a protective housing and a front lens containing light sources within the protective housing. The front crossmember 16 is arranged below the central opening 24. The central opening 24 is located at least 15 mm transversely from at least one or each of the lighting devices 28. Thus, the central opening 24 is extended transversely. This allows its clearance area to be maintained while limiting its height.

[0057] The front fascia 18 also has a support frame 30 configured to support the bumper skin 22. The support frame 30 is attached to the front crossmember 16. The support frame 30 is arranged between the light devices 28 and / or above the central opening 24. They are superimposed and are arranged behind the bumper skin 22.

[0058] The central opening 24 is an upper central opening. The front crossbar 16 is an upper front crossbar. According to one option of the invention, the front panel comprises a lower central opening and / or a lower front crossbar.

[0059] The motor vehicle can, for example, be a private motor vehicle or a commercial motor vehicle.

[0060] Figure 2 shows a support frame 30 for a bumper skin (not shown) of a motor vehicle, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to Figure 1.

[0061] The support frame 30 comprises a lower profile. It has stiffeners and / or break points. It provides firmness to the bumper skin while limiting the occurrence of hard spots in the event of a pedestrian impact. The support frame 30 comprises a vertical front portion 32 and a rear portion 34 horizontal. The front section 32 is designed to fit snugly against the bumper skin. It bypasses the central opening 24. The rear section 34 is designed to cover equipment (not shown) in the engine compartment. The front section 32 and / or the rear section 34 form a central body 36 of the support frame 30. The central body 36 is designed to be attached to the bumper skin.

[0062] The support frame 30 includes at least one positioning arm, referred to as the second positioning arm 38. In this case, the support frame 30 includes two transversely opposed second positioning arms 38. They extend laterally from the central body 36. Each second positioning arm 38 forms a mounting leg intended to be attached to the front crossmember. The second positioning arms 38 extend downwards from the central body 36. The central opening 24 is located between them.

[0063] Figure 3 shows a component of a front end assembly for a motor vehicle, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 2.

[0064] The front cross member 16 receives the light device 28 and the retaining frame 30, which frame the central opening 24. The central opening 24 is vertically positioned between the front cross member 16 and the retaining frame 30. The light device 28 has a protective housing 40 and a first positioning arm 42. The protective housing 40 forms a sealed enclosure. The first positioning arm 42 extends forward from the protective housing 40. It is located below the protective housing 40. It extends longitudinally towards the second positioning arm 38.

[0065] The front crossmember 16 includes a mounting surface 44. The mounting surface 44 is horizontal. It is above the front crossmember 16. The lighting device 28 is connected to the front crossmember 16 via its first positioning arm 42, which forms a front extension. The first positioning arm 42 has a first bearing surface 46 extending horizontally. This is, in this case, an upper surface on which a second bearing surface 48 of the second positioning arm 38 rests. The first bearing surface 46 and the second bearing surface 48 are superimposed above the mounting surface 44. They form a bearing interface 50. The bearing interface 50 is horizontal.

[0066] At least one of the first bearing surface 46 and the second bearing surface 48 comprises a longitudinal guide chamfer 52. Each longitudinal guide chamfer 52 forms an edge at one longitudinal end of one of the first bearing surface 46 and the second bearing surface 48. Each longitudinal guide chamfer 52 is able to cooperate with the other of the lower first bearing surface 46 and second bearing surface 48 during the assembly of the reinforcement 30 for support with the light device 28. Their assembly is carried out according to a longitudinal approach movement, then a longitudinal stop.

[0067] Each of the first bearing surface 46 and the second bearing surface 48 includes a longitudinal guide chamfer 52. The first bearing surface 46 includes a first guide chamfer 54. The second bearing surface 48 includes a second guide chamfer 56. The second guide chamfer 56 is longitudinally opposite to the first guide chamfer 54.

[0068] The first bearing surface 46 is below the second bearing surface 48. The second positioning arm 38 is in front of the first positioning arm 42. The first bearing surface 46 is vertically positioned between the fixing surface 44 and the second bearing surface 48. They form a vertical stack. The first positioning arm 42 is fixed to the fixing surface 44.

[0069] The front cross member 16 includes a vertical extension 58 forming the mounting surface 44. The vertical extension 58 forms a right angle. It may be an upper extension. It includes a vertical blade and a horizontal blade forming the mounting surface 44. The support frame 30 includes a central body 36. The central body 36 is a front body. The second positioning arm 38 extends transversely from said central body 36. It also extends it downwards.

[0070] The first positioning arm 42 comprises a front section 60 forming the first bearing surface 46, and a rear section 62 inclined relative to the front section 60. They are longitudinal sections. They are stepped, with the front section 60 being below the rear section 62. The first guide chamfer 54 extends vertically over at least half the vertical thickness of the front section 60. The first guide chamfer 54 is at the front end of the front section 60.

[0071] The first bearing surface 46 comprises a first transverse edge. The second bearing surface 48 comprises a second transverse edge longitudinally opposite the first transverse edge. The first positioning arm 42 and the second positioning arm 38 each comprise an inclined surface extending from the first or second transverse edge. Each inclined surface forms the longitudinal guide chamfer 52 and is inclined with respect to the horizontal direction.

[0072] According to an alternative of the invention, the fixing surface is above the first bearing surface and the second bearing surface.

[0073] According to an alternative of the invention, the second bearing surface is under the first bearing surface.

[0074] According to an alternative of the invention, the first positioning branch is in front of the second positioning branch.

[0075] According to an alternative embodiment of the invention, only one of the first and second bearing surfaces comprises a longitudinal guide chamfer. The other of the two bearing surfaces comprises a projecting edge that is adapted to cooperate with the longitudinal guide chamfer during the assembly of the retaining frame with the lighting device.

[0076] Figure 4 shows a first positioning arm 42 of a motor vehicle lighting device, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 3. The second positioning arm is not shown for clarity. The front section 60 is in the foreground.

[0077] The first bearing surface 46 comprises a first transverse edge 64. The first transverse edge 64 forms the front end of the first bearing surface 46. It extends transversely. The first positioning arm 42 comprises an inclined surface 66 extending from the first transverse edge 64. The inclined surface 66 forms the longitudinal guide chamfer 52. It is inclined with respect to the horizontal direction, preferably with respect to the longitudinal axis.

[0078] The first positioning arm 42 includes a recess 68. The recess 68 is formed in the front section 60. It forms a longitudinal groove in the first bearing surface 46. The recess 68 divides the first bearing surface 46 into two lateral parts. The first bearing surface 46 is split transversely by the recess 68.

[0079] The clearance 68 has a height of 70. This height of 70 can be an average height. The height of 70 corresponds to the depth measured from the first bearing surface 46. The height of the clearance 68 is between 5 mm and 15 mm, preferably between 8 mm and 12 mm. This height of 70 allows the screw head to be accommodated.

[0080] The first positioning arm 42 includes fastening means 72. The fastening means 72 include an opening (not shown) through which a screw cooperates with the front cross member 16. The fastening means 72 are connected to the vertical extension 58. The fastening means 72 are fixed to the fastening surface 44 of the front cross member 16. They are adjacent to or adjoining the clearance 68. The first guide chamfer 54 extends vertically over the entire height of the clearance.

[0081] The longitudinal guide chamfer 52, in this case the first guide chamfer 54, is inclined with respect to the longitudinal direction 76 by an angle of inclination 74 of between 20° and 60°; preferably between 30° and 50°. This range of inclination angle optimizes compactness and guide height.

[0082] Figure 5 shows a second positioning arm 38 of a motor vehicle support frame, according to an embodiment of the invention. motor vehicle may correspond to the one shown in relation to one of figures 1 to 4.

[0083] The second positioning arm 38 comprises a vertical pillar 78 and a longitudinal stud 80 extending longitudinally from the vertical pillar 78. The longitudinal stud 80 projects rearward. The longitudinal stud 80 extends toward the first positioning arm (not shown). The second guide chamfer 56 is formed by the longitudinal stud 80. It forms its lower surface. The second bearing surface 48 extends along the vertical pillar 78 and the longitudinal stud 80.

[0084] The second guide chamfer 56 extends transversely across the entire width of the longitudinal stud 80, and preferably across the vertical pillar 78. The second positioning arm 38 includes a wing 82 extending vertically beneath the longitudinal stud 80. The wing 82 can be a bumper skin mounting flange. It includes fastening means. It is designed to extend vertically at the level of the first positioning arm, in particular at the first guide chamfer. This feature contributes to compactness.

[0085] The second bearing surface 48 includes a second transverse edge 84. The second positioning arm 38 includes an inclined surface 66 extending from, or forming, the second transverse edge 84. The inclined surface 66 forms the longitudinal guide chamfer 52 and is inclined with respect to the horizontal direction.

[0086] The longitudinal guide chamfer 52, in this case the second guide chamfer 56, is inclined with respect to the longitudinal direction 76 by an angle of inclination 74 between 20° and 60°; preferably between 30° and 50°. The angle of inclination 74 associated with the second bearing surface 48 is less than or equal to the angle of inclination associated with the first bearing surface.

[0087] Figure 6 shows a front fascia assembly for a motor vehicle, according to an embodiment of the invention; the assembly being in a disassembled state. The retaining frame 30 and the lighting device 28 are brought longitudinally close to each other for assembly. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 5.

[0088] The second positioning arm 38 is engaged on the first positioning arm 42. The longitudinal guide chamfers 52 are facing each other and moving closer together. In the event of a vertical offset 86; for example, when the retaining bracket 30 is too low; the first guide chamfer 54 and the second guide chamfer 56 come into contact with each other, then slide against each other during the longitudinal movement until the vertical offset 86 disappears. Each chamfer provides vertical guidance during an assembly movement. relative between the lighting device and the support frame. Then the second support surface 48 slides on the first support surface 46 until the support frame 30 reaches its predefined mounting position.

[0089] It is clear that each longitudinal guide chamfer 52 facilitates the assembly of the unit since it corrects a vertical offset 86 when the support frame 30 and the lighting device 28 are positioned opposite each other. It provides assistance in handling these bulky components, which must be placed in precise positions.

[0090] According to a preferred embodiment, the frame and / or the second arm are made of a plastic or composite material. The plastic material may include a thermoplastic or 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.

[0091] The frame and / or the second arm comprise 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.

[0092] The invention comprises the combination of all the embodiments illustrated by all the figures.

[0093] Figures 2 to 6 are isometric views. They each respect a specific scale, real angles and real proportions.

Claims

Demands

1. Assembly for front fascia (18) of motor vehicle (10), the assembly comprising: a front cross member (16) with a mounting surface (44); a lighting device (28) with a first positioning arm (42) comprising a first bearing surface (46) extending horizontally; a bumper skin (22); a retaining frame (30) for the bumper skin (22), the retaining frame (30) comprising a second positioning arm (38) with a second bearing surface (48) against the first bearing surface (46) above the mounting surface (44) of the front cross member (16); characterized in that at least one of the first bearing surface (46) and of the second bearing surface (48) includes a longitudinal guide chamfer (52) capable of cooperating with the other of the first bearing surface (46) and of the second bearing surface (48) during the assembly of the retaining frame (30) with the lighting device (28).

2. Assembly according to claim 1, characterized in that each of the first bearing surface (46) and the second bearing surface (48) comprise a longitudinal guide chamfer (52); the first bearing surface (46) comprising a first guide chamfer (54), and the second bearing surface (48) comprising a second guide chamfer (56) longitudinally opposite to the first guide chamfer (54).

3. Assembly according to claim 2, characterized in that the first positioning arm (42) comprises a clearance (68) with a height (70), fastening means (72) which are fixed to the fastening surface (44) of the front cross member (16) and which are adjacent to the clearance (68); the first guide chamfer extends vertically over the entire height (70) of the clearance (68).

4. Assembly according to claim 3, characterized in that the height (70) of the clearance (68) is between 5 mm and 15 mm; the first bearing surface (46) is split transversely by the clearance (68).

5. Assembly according to any one of claims 2 to 4, characterized in that the second positioning arm (38) comprises a vertical pillar (78) and a longitudinal stud (80) extending longitudinally from the vertical pillar (78) to the first positioning arm (42); the second guiding chamfer (56) being formed by the longitudinal stud (80); preferably, the second guiding chamfer (56) extends transversely over the entire width of the longitudinal stud (80) and the second positioning arm (38) includes a wing (82) extending vertically under the longitudinal stud (80).

6. Assembly according to any one of claims 1 to 5, characterized in that the assembly comprises a longitudinal direction (76), each longitudinal guide chamfer (52) is inclined with respect to the longitudinal direction (76) by an angle of inclination (74) between 20° and 60°; preferably between 30° and 50°.

7. Assembly according to any one of claims 1 to 6, characterized in that the front cross member (16) comprises a vertical extension (58) forming the fixing surface (44); preferably, the first bearing surface (46) is vertically between the fixing surface (44) and the second bearing surface (48).

8. Assembly according to any one of claims 1 to 7, characterized in that the first positioning arm (42) comprises a front section (60) forming the first bearing surface (46), and a rear section (62) inclined relative to the front section (60); and / or the retaining frame (30) comprises a central body (36), the second positioning arm (38) extending transversely from said central body (36).

9. Assembly according to any one of claims 1 to 8, characterized in that the first bearing surface (46) is under the second bearing surface (48) and / or the second positioning arm (38) is in front of the first positioning arm (42).

10. Motor vehicle (10) comprising an assembly, characterized in that the assembly conforms to any one of claims 1 to 9; preferably, the bumper skin (22) comprises a central air inlet opening (24) vertically between the front crossmember (16) and the retaining frame (30), the central air inlet opening (24) being transversely distant from the light device (28) by no more than 15 mm; and / or the light device (28) comprises a protective housing (40), the retaining frame (30) extending transversely along said protective housing (40).

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