Assembly of trim with fixing and centering between two parts, and associated processes

Abstract

Trim assembly with fixing and centering between two parts, and associated methods The present invention relates to a trim assembly (10) for a motor vehicle, comprising a first part (12) and a second part (14), each of the parts (12, 14) comprising a centering portion (22, 56) and a fixing portion (24, 58). The first fastening portion (24) comprises a projecting element (30), the second fastening portion (58) comprises a locking element (62), a return element (64), and an inclined surface (66), the return element (64) being arranged to exert a force on the locking element (62) towards the inclined surface (66), such that the locking element (62) exerts a radial locking force on the projecting element (30) when the first fastening portion (24) and the second fastening portion (58) cooperate, the locking element (62) being at least partially magnetic. Figure for the abbreviation: Fig 4

Description

Title of the invention: Upholstery assembly with fixing and centering between two parts, and associated methods

[0001] The present invention relates to a trim assembly for a motor vehicle, comprising a first part and a second part fixed to each other.

[0002] The invention further relates to an associated assembly method and disassembly method.

[0003] We know of the process of joining two parts to form a trim assembly, for example, using screws or clips.

[0004] However, to disassemble the two parts, it is then necessary to have access to the fastening means. These must therefore be easily accessible from the outside. This can be particularly problematic when the surface is visible from inside the passenger compartment, both for aesthetic reasons and because of the risk that a passenger might detach the two parts.

[0005] In addition, a screw or clip fixing does not allow any movement during assembly, in particular to compensate for possible variations in the dimensions of the parts, especially when manufactured in plastic.

[0006] The aim of the invention is then to propose a trim element allowing easy assembly and disassembly, without means of fixing having direct access to a surface possibly provided on the outside.

[0007] To this end, the invention relates to a trim element for a motor vehicle, comprising a first part and a second part, the first part comprising a first centering portion and a first fixing portion, the second part comprising a second centering portion and a second fixing portion, the second centering portion being complementary to the first centering portion and adapted to cooperate with the first centering portion to center the first part and the second part with respect to each other, the second fixing portion being complementary to the first fixing portion and adapted to cooperate with the first fixing portion to fix the first part and the second part together, the first fixing portion comprising a protruding element, the second fixing portion comprising a locking element, a return element and an inclined surface,the return element being arranged to exert a force on the locking element towards the inclined surface, such that the locking element exerts a radial locking force on the protruding element, when the first fixing portion and the second fixing portion cooperate, to maintain the protruding element in position relative to the second fixing portion, the locking element, being at least partially magnetic.

[0008] The centering portions allow the two parts to be centered relative to each other. The fastening portions allow the parts to be fastened together. It is easy to disassemble the two parts without direct access to the fastening elements, in particular by applying a magnetic field acting on the locking element so as to oppose the return element which keeps the element protruding relative to the second fastening portion.

[0009] According to other advantageous aspects of the invention, the filling element comprises one or more of the following features, taken individually or in all technically possible combinations:

[0010] - one of the first centering portion and the second centering portion includes a protrusion, the other of the first centering portion and the second centering portion having a centering orifice;

[0011] - the first part comprises a main body, the protruding element being movable by relation to the main body along at least one direction perpendicular to an assembly direction of the first part and the second part;

[0012] - the protrusion extends outwards along the assembly direction;

[0013] - the main body of the first part defines a dwelling, the dwelling presenting a first opening and a second opening, the first opening and the second opening being aligned along the assembly direction, the second opening having a smaller passage section than the passage section of the first opening, the protruding element comprising a head and a stem, the head being arranged in the housing so that the stem extends from the protruding housing from the second opening, the first part comprising a wedge inserted between the head and the first opening so that the head is wedged along the assembly direction between the wedge and the edge of the second opening;

[0014] - the inclined surface extends between a proximal end and a distal end, the distal end being arranged so as to extend opposite the first piece, the inclined surface being inclined so that the distance in a radial direction between the protruding element and the distal end is strictly less than the distance in a radial direction between the protruding element and the proximal end when the first portion of the fixing cooperates with the second portion of the fixing;

[0015] - the blocking element comprises a plurality of balls; and

[0016] - the second part comprises a background, the retaining element extending between the background and the blocking element.

[0017] The invention also relates to a method for assembling a trim assembly as defined above, comprising the following steps:

[0018] - supply of the first part,

[0019] - supply of the second part, and

[0020] - bringing the first part and the second part closer together in a direction assembly, so that the first centering portion and the second centering portion cooperate, the protruding element pushing the locking element with an assembly force in the opposite direction to that exerted by the return element, until the first fixing portion and the second fixing portion cooperate to fix the first part and the second part together.

[0021] The invention also relates to a method for disassembling a trim assembly as previously described, comprising the following steps:

[0022] - application of a magnetic field to the first part, the magnetic field attracting the locking element with a disassembly force in the opposite direction to that exerted by the return element, and

[0023] - separation of the first part and the second part, the magnetic field being applied at least during the first part of the spacing.

[0024] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0025] [Fig-1] [Fig. 1] is a schematic cross-sectional representation of a trim element according to an example of an embodiment of the invention, the trim element being shown here during assembly,

[0026] [Fig.2] [Fig.2] is a schematic cross-sectional representation of the first part of a trim element similar to that of [Fig. 1] with a deflection perpendicular to the assembly direction,

[0027] [Fig.3] [Fig.3] is a schematic cross-sectional representation of the assembled trim element of [Fig.1],

[0028] [Fig.4] [Fig.4] is a schematic cross-sectional representation of the element of filling of the [Fig. 1], at the beginning of the disassembly, and

[0029] [Fig.5] [Fig.5] is a schematic cross-sectional representation of the trim element of [Fig.1], during disassembly.

[0030] An example of a trim assembly 10 for a motor vehicle according to an embodiment of the invention is shown in Figures 1 and 3 to 5.

[0031] The trim element 10 is, for example, a dashboard or a portion of a dashboard, or a center console or a portion of a center console, or a door panel or a portion of a door panel.

[0032] The trim set 10 comprises a first piece 12 and a second piece 14.

[0033] The first part 12 and the second part 14 are assembled according to an assembly direction X of the trim element.

[0034] For each of the first part 12 and the second part 14, the assembly direction X corresponds to the assembly direction of the trim element, when the first part 12 and the second part 14 are assembled.

[0035] The first piece 12 has a proximal face 16 intended to extend opposite the second piece 14 and a distal face 18 opposite the proximal face 16.

[0036] The first part 12 here comprises a main body 20.

[0037] The first part 12 comprises a first centering portion 22 and a first fixation portion 24.

[0038] The first centering portion 22 here has a centering orifice 26.

[0039] The first centering portion 22 is here fixed relative to the main body 16.

[0040] The first centering portion 22 is, for example, a portion of the main body 16, the main body 16 having the centering orifice 26.

[0041] More particularly here, the first centering portion 22 further includes protruding rims 28, the rims 28 extending along the assembly direction and surrounding the centering orifice 26.

[0042] The rims 28 extend in projection on the side of the distal face 18 opposite the proximal face 16.

[0043] The first portion of the fixing 24 includes a projecting element 30.

[0044] The first attachment portion 24 further comprises a portion of the body main 20.

[0045] The projecting element 30 extends in projection along the assembly direction X.

[0046] The projecting element 30 extends in projection relative to the proximal face 16.

[0047] The projecting element 30 includes, for example, a rod.

[0048] The projecting element 30 is here a separate part from the main body 20.

[0049] In the example shown, the projecting element 30 is movable relative to the main body 20 in at least one direction perpendicular to the assembly direction X, called direction(s) of movement Y, Z.

[0050] The projecting element 30 is, for example, movable relative to the main body 20 along a single direction of travel Y.

[0051] Alternatively, the projecting element 30 is, for example, movable in a plane perpendicular to the assembly direction X.

[0052] The main body 20 of the first part 12 here defines a housing 32.

[0053] The housing 32 is defined here between two surfaces of the main body 20, the two surfaces extending opposite each other along the assembly direction X.

[0054] Housing 32 has a first opening 34 and a second opening 36.

[0055] More specifically, each of the two surfaces delimiting the dwelling 32 has one of the openings 34, 36 respectively.

[0056] The first opening 34 and the second opening 36 are aligned along the direction assembly X.

[0057] More particularly, the second opening 36 is included in the projection of the first opening 34 along the assembly direction X on the corresponding surface.

[0058] The second opening 36 has a smaller passage section than the passage section of the first opening 34.

[0059] The projecting element 30 comprises a head 38 and a stem 40.

[0060] The head 38 and the rod 40 are joined, more particularly here formed of material.

[0061] The rod 40 extends from the head 38 along a main extension direction, here corresponding to the assembly direction X.

[0062] The head 38 is arranged here in the housing 32 so that the rod 40 extends from the housing 32 protruding through the second opening 36.

[0063] The head 38 comprises a bearing surface 42, the rod 40 extending from the bearing surface 42, and a free surface 44 opposite the bearing surface 42.

[0064] The bearing surface 42 extends in support of the edge of the second opening 36.

[0065] The head 38 has dimensions perpendicular to the main direction of extension strictly greater than those of the passage section of the second opening 36 and strictly less than those of the passage section of the first opening 34.

[0066] Thus, the protruding element 30 is capable of being inserted through the first opening 34.

[0067] The second opening 36 has a passage section having dimensions strictly greater than the section of the rod 40 in at least one direction perpendicular to the assembly direction X, more particularly in the direction(s) of movement Y, Z, more particularly of a desired movement.

[0068] The desired maximum travel is, for example, between 1 and 2 mm

[0069] In the example described, the dimensions of the housing 32 are perpendicular to the direction assembly dimensions are here greater than the said dimensions of the head 38 plus the corresponding travel.

[0070] Thus, the rod 40 is capable of moving perpendicularly to the assembly direction X, according to the travel allowed by the dimensioning of the openings, and of the rod.

[0071] Alternatively, the dimensions of the housing 32 perpendicular to the assembly direction are equal to the dimensions of the head 38 plus the desired travel. The rod 40 then has a cross-section with dimensions less than or equal to the cross-section of the second opening plus the desired travel.

[0072] Thus, the rod 40 is capable of moving perpendicularly to the assembly direction X, according to the travel permitted by the dimensioning of the head and the accommodation.

[0073] In general, the rod 40 is capable of moving perpendicularly to the assembly direction X, according to the travel allowed by the dimensioning of the openings, the rod, the head and the housing.

[0074] Such a deflection is represented here in [Fig.2].

[0075] A clearance allows for the compensation of any dispersions in the dimensions of the parts, particularly during plastic manufacturing, during the assembly of the trim element, more specifically by aligning the centering portions, so that the first fixing portion is adapted to move and align with the second fixing portion, as will be described later.

[0076] The first part 12, more particularly the first fixing portion 24, further includes a wedge 46 inserted between the head 38, more particularly against the free surface 44, and the first opening 34 so that the head 38 is wedged along the assembly direction X between the wedge 46 and the edges of the second opening 36.

[0077] The wedge 46 also allows the protruding element 30 to be held in place so that it does not come out through the first opening 34.

[0078] The dimension of the housing 32 along the assembly direction X, more particularly between the first opening 34 and the second opening 36, is equal to the sum of the dimension of the head 38 along the main extension direction of the rod 40 and the thickness of the shim 46, measured along the assembly direction, and a clearance, for example less than 0.1 mm.

[0079] Housing 32 has, for example, an opening (not visible on the section plan) on one side delimiting the housing perpendicular to the assembly direction.

[0080] Said opening has a passage section allowing the insertion of the wedge 46 into the housing 32.

[0081] Thus, the first portion of the fixing is, for example, pre-assembled by the following steps: insertion of the protruding element 30 through the first opening 34, so that the rod 40 protrudes through the second opening 36 and the bearing surface 42 extends against the edge of the second opening 36, then insertion of the wedge 46 between the head 38 and the first opening 34, more particularly against the free surface 44, more particularly through the side opening.

[0082] In the example shown, the first part 12 further includes at least a portion of protection 48 of the projecting element 30.

[0083] The at least one protective portion 48 comprises at least one surface extending from the proximal face 16 and has a dimension along the assembly direction X greater than that of the protruding element 30, so that the at least one surface protrudes relative to the protruding element along the assembly direction X.

[0084] More particularly here, at least one surface surrounds at a distance, here continuously, the protruding element 30.

[0085] The protective portion 48 is thus able to protect the rod 40 in case of impact on the proximal face 16, before assembly of the filling element.

[0086] The second piece 14 has a proximal face 50 intended to extend opposite the first piece 12 and a distal face 52 opposite the proximal face 50.

[0087] The distal face 52 is intended to be a visible face of the filling element.

[0088] The distal face 52 is here devoid of elements for centering or fixing the two pieces between them.

[0089] The second part 14 here comprises a main body 54.

[0090] The second part 14 comprises a second centering portion 56 and a second fixing portion 58.

[0091] The second centering portion 56 is complementary to the first centering portion 22 and adapted to cooperate with the first centering portion 22 to center the first part and the second part between them.

[0092] The second centering portion 56 here includes a protrusion 60.

[0093] The protrusion is adapted to be inserted into the centering orifice 26.

[0094] The protrusion extends outward from the proximal face 50.

[0095] The protrusion extends outward in a direction corresponding to the direction of the edges 28, when the trim element is assembled, here according to the assembly direction X.

[0096] The protrusion 60 preferably has a cross-section in the shape of a cross.

[0097] Thus, to center the parts, the protrusion is inserted into the orifice and is advantageously guided by the edges.

[0098] Alternatively, the first centering portion includes the protrusion, while the second centering portion has the centering orifice, and further advantageously includes the rims.

[0099] The second fastening portion 58 is complementary to the first fastening portion 22 and adapted to cooperate with the first fastening portion 22 to fix together the first part 12 and the second part 14.

[0100] The second fastening portion 58 includes a locking element 62, a return element 64 and an inclined surface 66.

[0101] The second portion of the fixing 58 further includes a receiving housing 68.

[0102] The second portion of the fixing 58 also includes a base 70.

[0103] The locking element 62 is at least partially magnetic, here made entirely of magnetic material, for example steel.

[0104] In the example shown, the blocking element 62 comprises, more particularly is made up of, a plurality of marbles, for example three marbles.

[0105] The balls are arranged here in a plane perpendicular to the assembly direction, that is to say that their respective centers are arranged on the same plane perpendicular to the assembly direction X.

[0106] In an embodiment not shown, the balls are housed in a ball holder, in particular in the form of a disc comprising housings for the balls on its periphery.

[0107] The return element 64 is, for example, a compression spring.

[0108] The retaining element 64 extends along the assembly direction X between a proximal end and a distal end.

[0109] The blocking element 62 is here arranged against the distal end of the return element 64.

[0110] The proximal end of the return element 64 extends here against the bottom 70.

[0111] The return element 64 is here compressed between the base 70 and the blocking element 62.

[0112] The inclined surface 66 extends between a proximal end 72 and a distal end 74.

[0113] The distal end 74 is arranged so as to extend opposite the first part 12.

[0114] The proximal end 72 is the edge of the inclined surface 66 opposite the distal end 74 along the assembly direction X.

[0115] The inclined surface 66 is here fixed relative to the main body 54.

[0116] The inclined surface 66 here forms a closed perimeter around a central axis.

[0117] The central axis extends along the assembly direction X.

[0118] The inclined surface 66 has a central opening, here centered on the central axis.

[0119] More specifically, the inclined surface 66 here comprises a portion in the shape of truncated cone 76.

[0120] The truncated cone-shaped portion extends from the proximal end 72 opposite the main body 54.

[0121] The truncated cone extends around an axis of rotation, said axis being coincident with the central axis.

[0122] The cone has, for example, an apex angle between 30 and 75°.

[0123] The inclined surface 66 further includes a portion of a buttress 78.

[0124] The stop portion 78 extends from the cone-shaped portion to the end distal 74.

[0125] The portion of the stop 78 extends here perpendicularly to the assembly direction X to within 10°.

[0126] More particularly here, the stop portion 78 delimits the central opening, here centered on the axis of rotation of the truncated cone.

[0127] The inclined surface, more particularly here the truncated cone-shaped portion 76, is inclined, so that the perimeter delimited by the inclined surface surrounds an increasing area from the proximal end 72 to the distal end 74.

[0128] In the case of the truncated cone-shaped portion 76, this means that the apex of the truncated cone is arranged so that the apex, the distal end 74 and the proximal end 72 are arranged in that order along the assembly direction X.

[0129] The return element 64 and the blocking element 62 are arranged so that the return element 64 exerts a force on the blocking element 62 towards the inclined surface 66.

[0130] More particularly, the compression spring is in a compressed state, the locking element 62 being arranged between the distal end of the return element 64 and the inclined surface 66, more particularly the truncated cone-shaped portion.

[0131] The bottom 70 extends opposite the inclined surface 66 along the return element 64.

[0132] The bottom 70 is fixed relative to the main body 54.

[0133] The bottom 70 extends perpendicularly to the assembly direction X.

[0134] The return element 64 extends between the base 70 and the blocking element 62.

[0135] In the embodiment shown, the bottom 70 is delimited by a piece fixed to the inclined surface 66.

[0136] Said part and inclined surface 66 then delimit a cavity, in which the locking element 62 and the return element 64 are arranged.

[0137] The cavity is closed except for the central opening.

[0138] The said part, the inclined surface 66, the locking element 62, and the retaining element 64 are, for example, pre-assembled into a single unit by mounting the retaining element 64 and the locking element 62 between the inclined surface and the said part, the retaining element 64 extending from the bottom 70, the locking element 62 extending against the inclined surface 66, and then securing the said part and the inclined surface. Thus, the locking element 62 and the retaining element 64 are held in the cavity between the said part and the inclined surface 66.

[0139] The reception housing 68 is fixed relative to the main body 54.

[0140] More specifically here, the reception housing 68 is formed by a portion of the main body 54.

[0141] The receiving housing 68 delimits a receiving cavity 80.

[0142] The locking element 62, the return element 64 and the inclined surface 66 are received through the receiving housing 68 in the receiving cavity.

[0143] More specifically here, the receiving housing 68 is adapted to receive the assembly described above, during a pre-assembly step.

[0144] The receiving housing 68 holds the assembly fixedly.

[0145] The receiving housing includes at least one lateral side 82 delimiting the cavity receiving perpendicular to the assembly direction X and a distal wall 84 delimiting the receiving cavity opposite the rest of the second part.

[0146] The receiving housing 68, more particularly the distal wall 84, has a central orifice 86 aligned with the central opening along the assembly direction X.

[0147] The assembly is held fixedly in the receiving cavity along the assembly direction X by the distal wall 84, more particularly between the distal wall 84 and an opposite wall of the main body.

[0148] The receiving housing also has an opening (not visible) on a lateral side 82 for inserting the assembly into the receiving cavity. This opening has sufficient dimensions for the passage of the assembly described above.

[0149] Alternatively, the bottom is not delimited by a particular part, but directly by the main body of the second part. The locking element 62, the return element 64 and the inclined surface 66 are then, for example, directly pre-mounted in the receiving cavity through the opening delimited in a lateral side of the receiving housing.

[0150] A method for assembling the trim element, i.e. the first part with the second part, will now be described with reference to figures 1 to 3.

[0151] The first part 12 and the second part 14 are brought together along the assembly direction X, more particularly by translation along the assembly direction X, as shown in [Fig.1].

[0152] In the example shown, the second piece 14 is moved towards the first piece 12.

[0153] The first centering portion 22 and the second centering portion 56 cooperate to center the first part 12 and the second part 14 relative to each other.

[0154] More specifically, the protrusion 60 penetrates the centering orifice 26.

[0155] The translation along the assembly direction X is then guided by the cooperation of the first centering portion 22 and the second centering portion 56.

[0156] In a particularly advantageous embodiment, the projecting element 30 moves along at least one direction of travel, so that the projecting element 30 aligns along the assembly direction X with the central opening and the central orifice, when the first centering portion 22 cooperates with the second centering portion 56.

[0157] The protruding element 30 passes through the central opening and the central orifice and enters the receiving cavity 80 in the assembly direction X.

[0158] The protruding element 30 pushes the locking element 62 with an assembly force in a direction opposite to the force exerted by the return element 64, until the first fastening portion 24 and the second fastening portion 56 cooperate to fix together the first piece 12 and the second piece 14.

[0159] Thus, the protruding element 30 pushes the blocking element 62, which pushes the return element 64 in compression.

[0160] Thus, the locking element 62, here the balls, move along the inclined surface 66 and away from the central axis by the inclination of the inclined surface 66, so that the protruding element 30, here the rod 40, fits into a space freed at the central axis by the locking element 62. More particularly here, the balls move away from the central axis and allow the passage of the rod 40.

[0161] After assembly, the force exerted by the return element 64 on the locking element 62 pushes the locking element 62 towards the inclined surface 66, as seen in [Fig.3].

[0162] The inclined surface 66 is inclined so that the distance along a radial direction between the protruding element 30 and the distal end 74 is strictly less than the distance along a radial direction between the protruding element and the proximal end 72 when the first fixing portion 24 cooperates with the second fixing portion 58.

[0163] Thus, the locking element 82, through the inclined surface 66 which translates the force of the return element 64 into a radial force, exerts a radial force towards the central axis, and thus locks the protruding element 30.

[0164] The projecting element 30 is then held in position relative to the second fixing portion 58, so that the first part 12 is held in position relative to the second part 14.

[0165] A method for disassembling the trim element will now be described, with reference to Figures 4 and 5.

[0166] The disassembly process comprises the following steps:

[0167] - application of a magnetic field on the first part 12, the magnetic field attracting the locking element 62 with a disassembly force in the opposite direction to that exerted by the return element 64, and

[0168] - spacing of the first piece 12 and the second piece 14, the field ma genetics being applied at least during a first part of the separation.

[0169] More particularly, the magnetic field is applied by bringing a magnet 90 close to the distal surface 52 of the second part 14.

[0170] The magnet 90 thus attracts the blocking element 62 which is at least partially magnetic.

[0171] The magnetic field is such that the disassembly force is strictly greater than the force exerted by the return element 64 on the locking element 62.

[0172] Thus, the blocking element 62 is attracted to the distal surface 52 of the second part 14 and moves towards it along the assembly direction X.

[0173] The blocking element 62 compresses the callback element 64.

[0174] The inclination of the inclined surface 66 then gives a radial play to the locking element 62 around the projecting element 30, more particularly of the rod 40.

[0175] Thus, the protruding element 30 is no longer blocked by the blocking element 62.

[0176] The first part 12 and the second part 14 are then separated by maintaining the application of the magnetic field at least during a first part of the separation, in particular at least until the protruding element 30 is extracted from the second portion of the fixing 58.

[0177] Thus, disassembly is carried out without direct access to the fastening elements, but only remotely by applying a magnetic field to the distal surface 52.

[0178] The distal surface 52, intended for example to be visible, is thus likely to include no accessible element to allow centering, fixing or disassembly.

Claims

Demands

1. A trim assembly (10) for a motor vehicle, comprising a first part (12) and a second part (14), the first part (12) comprising a first centering portion (22) and a first fastening portion (24), the second part (14) comprising a second centering portion (56) and a second fastening portion (58), the second centering portion (56) being complementary to the first centering portion (22) and adapted to cooperate with the first centering portion (22) to center the first part (12) and the second part (14) with respect to each other, the second fastening portion (58) being complementary to the first fastening portion (24) and adapted to cooperate with the first fastening portion (24) to fasten together the first part (12) and the second part (14), the first fastening portion (24) comprising a protruding element (30), the second fastening portion (58) comprising a locking element (62),a return element (64) and an inclined surface (66), the return element (64) being arranged to exert a force on the locking element (62) towards the inclined surface (66), such that the locking element (62) exerts a radial locking force on the protruding element (30), when the first fixing portion (24) and the second fixing portion (58) cooperate, to maintain the protruding element (30) in position relative to the second fixing portion (58), the locking element (62) being at least partially magnetic.

2. A packing assembly according to claim 1, wherein one of the first centering portion (22) and the second centering portion (56) comprises a protrusion (60), the other of the first centering portion (22) and the second centering portion (56) having a centering orifice (26).

3. A trim assembly according to claim 1 or 2, wherein the first part (12) comprises a main body (20), the projecting element (30) being movable relative to the main body (20) in at least one direction perpendicular to an assembly direction (X) of the first part (12) and the second part (14).

4. A trim assembly according to claim 3, when it depends on claim 2, wherein the protrusion (60) extends in projection along the assembly direction (X).

5. Upholstery assembly according to claim 3 or 4, wherein the main body (20) of the first part (12) defines a housing (32), the housing (32) having a first opening (34) and a second opening (36), the first opening (34) and the second opening (36) being aligned along the assembly direction (X), the second opening (36) having a passage section smaller than the passage section of the first opening (34), the projecting element (30) comprising a head (38) and a rod (40), the head (38) being arranged in the housing (32) so that the rod (40) extends from the housing (32) projecting from the second opening (34), the first part (12) comprising a wedge (42) inserted between the head (38) and the first opening (34) so ​​that the head (38) is wedged along the assembly direction (X) between the wedge (42) and the edge of the second opening (36).

6. A trim assembly according to any one of claims 1 to 5, wherein the inclined surface (66) extends between a proximal end (72) and a distal end (74), the distal end (74) being arranged to extend opposite the first piece (12), the inclined surface (66) being inclined such that the distance in a radial direction between the protruding element (30) and the distal end (74) is strictly less than the distance in a radial direction between the protruding element (30) and the proximal end (72) when the first fastening portion (24) cooperates with the second fastening portion (58).

7. A packing assembly according to any one of claims 1 to 6, wherein the locking element (62) comprises a plurality of balls.

8. A trim assembly according to any one of claims 1 to 7, wherein the second part (14) comprises a base (70), the return element (64) extending between the base (70) and the locking element (62).

9. Method of assembling a trim assembly (10) according to any one of supplies 1 to 8, comprising the following steps: - supplying the first part (12), - supplying the second part (14), and - bringing the first part (12) and the second part (14) together in an assembly direction (X), such that the first centering portion (22) and the second centering portion (56) cooperate, the protruding element (30) pushing the locking element (62) with an assembly force in a direction opposite to that exerted by the return element (64), until the first fixing portion (24) cooperates and the second fastening portion (58) to fix together the first part (12) and the second part (14).

10. Method for disassembling a packing assembly (10) according to any one of supplies 1 to 8, comprising the following steps: - application of a magnetic field to the first part, the magnetic field attracting the locking element (62) with a disassembly force in the opposite direction to that exerted by the return element (64), and - separation of the first part (12) and the second part (14), the magnetic field being applied at least during a first part of the separation.