FR3081378A1 - PIECE, KIT AND HUB SUPPORT ASSEMBLY OF A VEHICLE DRIVE WHEEL, AND METHODS OF MANUFACTURING AND ASSEMBLING THE SAME - Google Patents

Abstract

A hub support piece (14) for a driving wheel hub (12) of a vehicle constitutes a transmission seal bowl (44) and a splined shaft (46) projecting from an outer face (48) of the seal bowl transmission (44) in an axial direction defining a reference axis (200). The splined shaft (46) having a free end portion (50) and an intermediate portion (52) located between the free end portion (50) and the transmission joint bowl (44). The free end portion (50) has guide ribs parallel to the reference axis (200), projecting radially outward and having sides delimiting grooves, the free end portion (50) of the splined shaft (46) having, in orthogonal projection on a reference plane perpendicular to the reference axis (200), a determined closed outer periphery. The intermediate portion (52) of the splined shaft (46) has machining ribs parallel to the reference axis (200) in the axial extension of the guide ribs, projecting radially outward and having sides delimiting grooves. The sides of the machining ribs have an orthogonal projection on the reference plane, located radially outside the closed outer periphery of the free end portion (50) of the splined shaft (46).

Description

VEHICLE DRIVE WHEEL HUB SUPPORT PART, KIT AND ASSEMBLY AND METHODS OF MANUFACTURE AND ASSEMBLY

TECHNICAL FIELD OF THE INVENTION The invention relates to the assembly of a driving wheel hub of a vehicle on a bowl of transmission joint. It relates in particular to a connection between on the one hand a hub support piece forming a transmission joint bowl and a splined shaft and, on the other hand, a drive wheel hub comprising a splined cavity in which the splined shaft penetrates in force during assembly.

STATE OF THE PRIOR ART A conventional mode of assembly of a driving wheel hub on a bowl of transmission joint consists in forming in the driving wheel hub a grooved cavity in which is inserted a section of splined shaft formed at the end of the transmission bowl. The connection is secured by a screw, the head of which bears against a shoulder formed on the hub and which is screwed into a thread formed at the end of the splined shaft. This technology is illustrated for example by the document JP 2004340311 A. A difficulty during assembly is to precisely align the ribs formed on the splined shaft section with the 20 inner splines of the hub cavity. A mounting clearance between grooves and ribs is generally provided, which negatively impacts the performance of the connection.

In document US 2010/0331093 is proposed a method of securing a drive wheel hub to a constant velocity joint bowl, which consists of providing on the part constituting the constant velocity joint bowl a portion of grooved axis that one comes to hoop in a cavity provided for this purpose in the wheel hub, the cavity not being grooved beforehand, so that the hooping is accompanied by machining of the wall of the cavity, related to a pinout. The material shavings generated by this operation are pushed back in front of the axis section 30 as the latter is forcefully inserted. According to one embodiment, the cavity is open at its two ends, so that the evacuation of the chips poses no problem. It is provided in this case that at the end of insertion, the end of the axis comes out of the cavity and is deformed radially outward to come to bear on the periphery of the end of the cavity, this to secure the connection between the two parts in the axial direction. According to a variant, it can be provided that the end of the axis, which emerges from the cavity at the end of the insertion, is threaded and receives a nut which comes to bear on the hub to axially secure the connection. The connection obtained between the splined shaft and the cavity machined during insertion has excellent performance over time, but requires a very high tonnage press for assembly.

PRESENTATION OF THE INVENTION The invention aims to remedy the drawbacks of the state of the art and to propose means for making a splined connection without play between a transmission bowl and a drive wheel hub in a simplified manner.

To do this is proposed, according to a first aspect of the invention, a hub support part for a driving wheel hub of a vehicle, constituting a bowl of transmission joint and a splined shaft projecting from an outer face of the transmission joint bowl in an axial direction defining a reference axis of the hub support part, the splined shaft comprising a free end portion and an intermediate portion located between the free end portion and the bowl transmission joint. The free end portion of the fluted shaft has guide ribs parallel to the reference axis, projecting radially outward and having sides delimiting splines, the free end portion of the fluted shaft having, in orthogonal projection on a reference plane perpendicular to the reference axis, a determined closed outer periphery. The intermediate portion of the splined shaft has machining ribs parallel to the reference axis in the axial extension of the guide ribs, projecting radially outward and having sides delimiting grooves. The sides of the machining ribs have an orthogonal projection on the reference plane, located radially outside the closed outer periphery of the free end portion of the splined shaft. By providing guide ribs on the end portion of the splined shaft and larger ribs on the intermediate portion of the splined shaft, two successive stages of insertion of the splined shaft are allowed in a cavity formed in a driving wheel hub: in a first step, only the end portion enters the cavity, and one can provide a mounting clearance between the guide ribs of the end portion and grooves formed in the cavity , so that the guide ribs are easily positioned in the grooves formed in the cavity; in a second step, while the splined shaft continues to progress in the cavity of the hub, the intermediate portion of the splined shaft, correctly positioned, enters the cavity, and the machining ribs machine the splines of the cavity , causing a reduction in the thickness of the ribs of the cavity.

Preferably, the hub support part has an annular groove separating the guide ribs from the machining ribs. The annular groove constitutes a volume available to receive the shavings of material formed during the penetration of the intermediate portion of the splined shaft. The groove also makes it possible to overcome any manufacturing defects in the ribs and grooves at the junction between the end portion and the intermediate portion of the splined shaft.

Preferably, the annular groove has sharp edges of intersection with the machining ribs. These sharp edges ensure a good cut of the material of the hub cavity during the penetration of the intermediate portion of the splined shaft.

Preferably, the hub support part comprises a threaded hole aligned with the reference axis and opening at a free end of the free end portion. It is thus possible to secure the connection between the hub of the support part using a screw whose head comes directly or indirectly to bear against a shoulder of the hub.

According to another aspect of the invention, it relates to a vehicle driving wheel support kit comprising a driving wheel hub comprising a grooved cavity open at at least one end and defining a hub axis, as well as a hub support part according to the first aspect of the invention. This hub support part is preferably such that when the reference axis of the hub support part is aligned with the hub axis in an insertion position, the grooved cavity has, in orthogonal projection on the plane reference, a closed outer periphery which surrounds the closed outer periphery of the end portion of the hub support piece, and is positioned radially between the closed outer periphery of the end portion of the hub support piece and the orthogonal projection of the sides of the ribs of the intermediate portion of the hub support part.

Preferably, the hub support part comprises a threaded hole aligned with the reference axis and opening at a free end of the free end portion and the kit also comprises securing means comprising a threaded rod able to be screwed into the threaded hole of the hub support part and a bearing face capable of bearing directly or indirectly against a corresponding bearing face of the drive wheel hub.

Preferably, the grooved cavity opens out through two opposite axial end openings delimited by walls located radially and axially outside the grooved cavity. The inner groove of the hub cavity can thus be formed by a broaching tool which crosses the cavity right through, entering through an end opening and partially emerging from the other end.

According to another aspect of the invention, it relates to a vehicle drive wheel support assembly comprising a drive wheel hub comprising a grooved cavity open at at least one end and defining a hub axis, and a hub support piece according to the first aspect of the invention, the reference axis of which is preferably aligned with the hub axis, the intermediate portion of the hub support piece being pinned in the grooved cavity, the free end portion of the splined shaft being engaged in the splined cavity with a mounting clearance.

Preferably, the hub support part comprises a threaded hole aligned on the reference axis and opening at a free end of the free end portion, and the assembly further comprises securing means comprising a threaded rod screwed into the threaded hole of the hub support part and a shoulder in direct or indirect support against a corresponding shoulder of the drive wheel hub.

Preferably, the grooved cavity opens out through two opposite axial end openings delimited by walls located radially and axially outside the grooved cavity.

According to another aspect of the invention, it relates to a method of assembling a drive wheel support assembly for a vehicle comprising a drive wheel hub comprising a grooved cavity open at at least one end and defining a hub axis, and a hub support piece according to the first aspect of the invention. According to this method, the splined shaft of the hub support part is inserted axially in the grooved cavity so that the hub axis is aligned with the reference axis of the hub support part, the portion of the grooved shaft end being inserted into the grooved cavity so that the guide ribs of the end portion of the grooved shaft are positioned in grooves of the grooved cavity, between ribs of the cavity grooved, and the intermediate portion of the grooved shaft being inserted so as to cause machining of the ribs of the grooved cavity.

Preferably, the hub support part has an annular groove separating the guide ribs from the machining ribs, the machining of the ribs of the grooved cavity being accompanied by filling of the annular groove with shavings. machined material.

According to one embodiment, the assembly includes a prior step of forming the drive wheel hub from a blank. Preferably, the blank of the wheel hub has a non-grooved cavity with two opposite axial end openings which is machined by a broaching tool which penetrates through an end opening of the non-grooved cavity to come out at least partially by the opposite end, forming the grooves of the cavity.

According to one embodiment, there is provided, following the insertion of the splined shaft in the hub support part, a securing step, using securing means comprising a threaded rod that the it is screwed into a threaded hole in the hub support part and a shoulder which comes into direct or indirect abutment against a corresponding shoulder of the drive wheel hub.

According to another aspect of the invention, it relates to a method of manufacturing a hub support part according to the first aspect of the invention, method according to which a blank part having a shaft non-fluted cylindrical is machined by rolling on a rack device comprising two parallel racks, so that simultaneously:

a free end portion of the non-fluted cylindrical shaft rolls on a first of the two parallel racks to form the free end portion of the fluted shaft, and

an intermediate portion of the non-fluted cylindrical shaft rolls on a second of the two parallel racks to form the intermediate portion of the fluted shaft. The proposed method is particularly simple, not very demanding in terms of energy power and suitable for high rates. Preferably, it is provided that before, during or after machining the free end portion and the intermediate portion of 1 fluted shaft, a tool is machining an annular groove separating the guide ribs from the machining ribs, so such that the groove has sharp edges of intersection with the machining ribs.

Preferably the second rack has chamfered teeth at their end adjacent to the first rack and / or the first rack has chamfered teeth at their end adjacent to the second rack. The chamfers allow the material of the blank to creep during the formation of the free end portion and the intermediate portion of the splined shaft by rolling on the racks.

BRIEF DESCRIPTION OF THE FIGURES Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate:

Figure 1, an axial sectional view of a wheel support assembly according to an embodiment of the invention;

Figure 2 a detail view of the wheel support assembly of Figure 1, in cross section along a section plane II-II illustrated in Figure 1;

Figure 3 a detail view of the wheel support assembly of Figure 1, in cross section along a section plane ΠΙ-III illustrated in Figure 1;

- Figure 4, an axial sectional view of a subset of the assembly of Figure 1;

- Figure 5, an isometric view of a part of the wheel support assembly of Figure 1;

- Figure 6, a schematic isometric view of a manufacturing step of the wheel support part of Figure 5;

Figure 7, a schematic sectional view of the manufacturing step of Figure 6, along a section plane VII-VII illustrated in Figure 8;

- Figure 8, a schematic view in an axial direction of the manufacturing step of Figure 6;

FIG. 9, a detail corresponding to the frame IX of FIG. 8.

For the sake of clarity, identical or similar elements are identified by identical reference signs in all of the figures.

DETAILED DESCRIPTION OF EMBODIMENTS In FIG. 1 is illustrated an assembly 10 for the driving wheel of a vehicle, comprising a driving wheel hub 12 defining a hub axis which is also an axis of revolution 100 of the wheel, a hub support part 14, and means 16 for securing the connection between the drive wheel hub 12 and the hub support part 14.

The drive wheel hub 12, illustrated in FIG. 4, is a one-piece annular piece forming a flange 18 for fixing a wheel rim, which has an annular flat face 20 and fixing holes 22 oriented parallel to the axis of revolution 100. The drive wheel hub 12 also has a barrel 24 extending the flange 18 on a side opposite the annular planar face 20, on which are formed an inner raceway 26 facing radially outward and a cylindrical bearing surface 28 facing radially outwards and intended to constitute a hooping bearing surface of one or more inner bearing rings. The free end 30 of the barrel 24 is shown here folded radially outward in a final assembly position, which is only the case after the insertion of the inner ring after a flaring deformation operation. , for example using a dowel.

The drive wheel hub 12 is crossed by a cavity 32 having two opposite flared axial end openings 34, 36, and a fluted middle portion 38 having an alternation of ribs 40 (illustrated in Figures 2 and 3) s extending parallel to the axis of revolution 100, projecting radially towards the axis of revolution 100 and grooves 42, the latter also extending parallel to the axis of revolution 100 and opening axially through the two end openings opposite axial 34, 36 of the grooved cavity 38. The ribs 40 and grooves 42 of the grooved cavity 38 are preferably uniform over the entire length of the grooved cavity 38, in the sense that they have a constant cross section.

The hub support part 14, illustrated in FIG. 5, forms a bowl of transmission joint 44 and a splined shaft 46 which projects from a flat outer face 48 of the bowl of transmission joint 44 in an axial direction defining a reference axis 200 of the hub support part 14, this reference axis 200 being, in the finished assembly of FIG. 1, coincident with the axis of revolution 100 defined by the wheel hub 12.

The splined shaft 46 has a free end portion 50 and an intermediate portion 52 located between the free end portion 50 and the bowl of transmission joint 44.

The free end portion 50 of the splined shaft 46 has guide ribs 54 parallel to the reference axis 200, projecting radially towards the outside and having sides 56 delimiting guide grooves 58.

These ribs 54 and grooves 58 are preferably uniform over the entire length of the free end portion 50, in the sense that they have a constant cross-section.

The intermediate portion 52 of the fluted shaft 46 has for its part machining ribs 60 parallel to the reference axis 200, projecting 15 radially outward and having sides 62 delimiting machining grooves 64. These ribs 60 and grooves 64 are preferably uniform over the entire length of the intermediate portion 52 of the grooved shaft 46, in the sense that they have a constant section in cross section.

The grooves 64 of the intermediate portion 52 are located in the axial extension of the grooves 58 of the free end portion 50 and the ribs 60 of the intermediate portion 52 are located in the axial extension of the ribs 54 of the portion free end 50. If one defines any reference plane of the hub support part, perpendicular to the reference axis, for example the observation plane of FIGS. 8 and 9, and if one observe the closed periphery 25 66 of the orthogonal projection of the free end portion 50 of the splined shaft on the reference plane, and the closed periphery 68 of the orthogonal projection of the intermediate portion 52 of 1 fluted shaft 46 on the reference plane, it is observed that the sides 62 of the ribs 60 of the intermediate portion 52 of the fluted shaft 46 have an orthogonal projection on the reference plane, located outside the outer periphery r closed 66 of the free end portion 50 of the fluted shaft 46, and that, preferably, the closed periphery 68 of the intermediate portion 52 of the fluted shaft 46 is located radially outside or in tangential contact with the outer periphery 66 of the free end portion 50 of the splined shaft 46.

The splined shaft 46 of the hub support part 14 further has an annular groove 70 separating the free end portion 50 from the intermediate portion 52. The groove 70 has sharp edges 72 of intersection with the ribs for machining the intermediate portion 52.

The hub support part 14 further includes a threaded hole 74 aligned on 1 reference axis 200 and opening at a free end of the portion 10 of free end 50.

Overall as illustrated in Figure 1, the splined shaft 46 is positioned in the splined cavity 38, to provide a rotational connection between the hub support part 14 and the drive wheel hub 12 and allow the transmission of a torque from one part to another. Before assembly, the dimensional characteristics 15 of the grooved cavity 38 are such that when the reference axis

200 of the hub support part 14 is aligned with the axis of revolution 100 in an insertion position, the grooved cavity 38 has, in orthogonal projection on a reference plane perpendicular to the axis of revolution 100, an outer periphery closed 76 (FIG. 2) which surrounds the closed external periphery 66 of the end portion 50 of the end of the splined shaft 46, and is positioned radially between the closed external periphery 66 of the end portion 50 of the splined shaft 46 and the orthogonal projection of the sides 62 of the ribs 60 of the intermediate portion 52 of the splined shaft 46.

For assembly, the splined shaft 46 of the hub support part 14 is inserted axially in the splined cavity 38 so that the axis of revolution 100 of the wheel hub 12 is aligned with the reference axis 200 of the hub support piece 14. The end portion 50 of the splined shaft 46 is first inserted in the splined cavity 38 so that the guide ribs 54 of the portion d end 50 of the fluted shaft 46 are positioned in the flutes 42 of the fluted cavity 38, between the ribs 40 of the fluted cavity

38, with a mounting clearance visible in FIG. 2. It is thus ensured that the angular positioning of the hub support part 14 relative to the wheel hub 12 around the reference axis 100 is good. When the penetration of the intermediate portion 52 of the fluted shaft 46 into the fluted cavity 38, the sharp edges 72 cause the sides of the ribs 40 of the fluted cavity 38 to be machined, and the shavings of material produced are pushed back into the annular groove 70 at as the fluted shaft 46 advances in the fluted cavity 38. This machining, preferably carried out cold, ensures intimate contact between the sides 62 of the ribs 60 of the intermediate portion 52 of the fluted shaft 46 and the machined sides of the ribs 40 of the grooved cavity 38.

The securing means 16 comprise a screw 78 having a threaded body 80 screwed into the threaded hole 74 provided for this purpose in the hub support piece 14, and a head 82 coming to be pressed against a support piece 84 which comes to bear against a bearing face 85 formed by the wall of the flared opening 34. The contact interface between the bearing piece 84 and the wheel hub 12 at the bearing face 85, which in this embodiment is frustoconical, is more distant from the axis of revolution 100 than the grooved interface between the grooved shaft 46 and the grooved cavity 38, this second interface being itself further away from the axis of revolution 100 that the planar interface between the support piece 84 and the screw head 82. The planar annular face 48 of the hub support piece 14 bears against the flange 30.

The support piece 84 is provided with tabs 86 distributed around the axis of revolution 100 and projecting axially opposite the bowl of transmission joint 44, to form one or two bearing surfaces 88, 90 intended for serve as a guide for centering a brake disc and the rim of the wheel when they are mounted on the wheel hub 12.

The geometry of the parts of the assembly 10 promotes manufacturing by simple and low-energy means.

The grooved cavity 38 can be formed very simply by a broaching tool passing through the hub 12 right through. This operation can be carried out cold.

The hub support part 14 can be manufactured from a blank part 91 having a non-grooved cylindrical shaft which is machined as illustrated in FIGS. 6 to 9 by rolling on a rack device comprising two parallel racks 92, 94, namely a first rack 92 to form the free end portion and a second rack 94 to form the intermediate portion. The teeth of the second rack 94 are preferably chamfered at their end adjacent to the first rack 92. Likewise, the teeth of the first rack 92 are preferably chamfered at their end adjacent to the second rack 94.

By rolling the non-fluted shaft simultaneously on the two racks positioned side by side, the two portions 50, 52 of the fluted shaft 46 are formed in the same machining pass. The bevels of the teeth of the two racks 92, 94 allow the material of the blank 91 to find space during its deformation by rolling on the two racks 92, 94.

Before, during or preferably after this machining operation, a tool is machining the annular groove 70 separating the guide ribs 54 of the machining ribs 60, so that the groove 70 has sharp edges 72 d intersection with the sides 62 of the machining ribs 60 of the intermediate portion 52 of 1 fluted shaft 46. A person skilled in the art will understand that, according to the order of operations, the groove 70 will or may not be present in FIGS. 6 and 7. A groove can be preformed before passing over the racks, before a tool comes to machine the sharp edges 72.

Naturally, the example shown in the figures and discussed above is given only by way of illustration.

According to a variant not illustrated, the raceway 26 can be omitted, if the guidance of the wheel hub 12 is exclusively achieved by one or more bearing rings hooped on the cylindrical surface 28.

According to another variant not shown, the cylindrical surface 28 can be omitted, if the guide of the wheel hub 12 is exclusively achieved by one or more raceways 26 formed directly on the wheel hub 12.

According to a variant, the end of the barrel 24 of the wheel hub 12 may not form a material flap, in particular in the absence of an added bearing ring, or if a bearing ring hooped on the cylindrical seat 28 comes into axial abutment directly against the flat face 48 of the transmission seal bowl 44.

According to a variant, the support piece 84 can be omitted or simplified, in particular if 1 opening 34 is not flared, but on the contrary of diameter less than the largest diameter of the grooved cavity 38. However, the advantage of a simple method of forming the grooved cavity by a pin passing right through 15 the cavity 32.

It is explicitly provided that we can combine them the various embodiments illustrated to offer others.

Claims (14)

Hub support part (14) for a driving wheel hub (12) of a vehicle, constituting a bowl of transmission joint (44) and a splined shaft (46) projecting from an external face (48) of the joint bowl transmission (44) in an axial direction defining a reference axis (200) of the hub support part (14), the splined shaft (46) having a free end portion (50) and an intermediate portion ( 52) located between the free end portion (50) and the transmission joint bowl (44), characterized in that - The free end portion (50) of the splined shaft (46) has guide ribs (54) parallel to the reference axis (200), projecting radially outward and having sides (56 ) delimiting grooves (58), the free end portion (50) of the grooved shaft (46) having, in orthogonal projection on a reference plane perpendicular to the reference axis (200), a closed outer periphery (66) determined, - The intermediate portion (52) of the splined shaft (46) has machining ribs (60) parallel to the reference axis (200) in the axial extension of the guide ribs (54), projecting radially towards the exterior and having flanks (62) delimiting grooves (64), and - The sides (62) of the machining ribs (60) have an orthogonal projection on the reference plane, located radially outside the closed outer periphery (66) of the free end portion (50) of the splined shaft (46). Hub support piece (14) according to claim 1, characterized in that the hub support piece (14) has an annular groove (70) separating the guide ribs (54) from the machining ribs (60). 3. hub support part according to claim 2, characterized in that the annular groove (70) has sharp edges (72) of intersection with the machining ribs (60). 4. hub support part (14) according to any one of the preceding claims, characterized in that the hub support part (14) has a threaded hole (74) aligned with the reference axis (200) and opening at a free end of the free end portion (50). 5. Vehicle driving wheel support kit comprising a driving wheel hub (12) comprising a grooved cavity (38) open at at least one end and defining a hub axis (100), characterized in that it comprises in addition to a hub support piece (14) according to any one of the preceding claims, such that when the reference axis (200) of the hub support piece (14) is aligned with the hub axis (100 ) in an insertion position, the grooved cavity (38) has, in orthogonal projection on the reference plane, a closed outer periphery (76) which surrounds the closed external periphery (66) of the end portion (50) of the hub support piece (14), and is positioned radially between the closed outer periphery (66) of the end portion (50) of the hub support piece (14) and the orthogonal projection of the flanks (62 ) ribs (60) of the intermediate portion (52) of the support part hub (14). 6. vehicle driving wheel support kit according to claim 5, characterized in that the hub support part (14) is according to claim 4, the kit further comprising securing means (16) comprising a threaded rod (78) able to be screwed into the threaded hole (74) of the hub support part (14) and a bearing face capable of bearing directly or indirectly against a corresponding bearing face (85) of the drive wheel hub (12). 7. Vehicle driving wheel support kit according to any one of claims 5 to 6, characterized in that the grooved cavity (38) opens by two opposite axial end openings (34, 36) delimited by walls located radially and axially outside the grooved cavity (38). 8. Vehicle drive wheel support assembly (10) comprising a drive wheel hub (12) comprising a grooved cavity (38) open at at least one end and defining a hub axis (100), characterized in that it further comprises a hub support part (14) according to any one of claims 1 to 4, the reference axis (200) of which is aligned with the hub axis (100), the intermediate portion (52 ) of the hub support part (14) being pinned in the grooved cavity (38), the free end portion (50) of the grooved shaft (46) being engaged in the grooved cavity (38) with a clearance mounting. 9. assembly (10) of the vehicle driving wheel support according to claim 8, characterized in that the hub support part (14) is according to claim 4, the assembly (10) further comprising securing means (16) comprising a threaded rod (78) screwed into the threaded hole (74) of the hub support piece (14) and a shoulder (82) in direct or indirect support against a corresponding shoulder of the drive wheel hub (12 ). 10. An assembly (10) for a vehicle driving wheel support according to any one of claims 8 to 9, characterized in that the grooved cavity (38) opens out through two opposite axial end openings (34, 36) delimited by walls located radially and axially outside the grooved cavity (38). 11. Method for assembling a vehicle drive wheel support assembly (10) comprising a drive wheel hub (12) comprising a grooved cavity (38) open at at least one end and defining a hub axis (100 ), and a hub support part (14) according to any one of claims 1 to 4, characterized in that the splined shaft (46) of the hub support part (14) is inserted axially in the grooved cavity (38) so that the hub axis (100) is aligned with the reference axis (200) of the hub support part (14), the end portion (50) of the splined shaft (46) being inserted into the splined cavity (38) so that the 12. 13. 14. 15. guide ribs (54) of the end portion (50) of the grooved shaft (46) are positioned in grooves (42) of the grooved cavity (38), between ribs (40) of the grooved cavity ( 38), and the intermediate portion (52) of the splined shaft (46) being inserted so as to cause machining of the ribs (40) of the splined cavity (38). Assembly method according to claim 11, characterized in that the hub support part (14) is according to claim 2, the machining of the ribs (40) of the grooved cavity (38) being accompanied by a filling of the annular groove (70) by shavings of machined material. Method of manufacturing a hub support part (14) according to any one of Claims 1 to 4, characterized in that a preform part having a cylindrical non-grooved shaft is machined by rolling on a rack device comprising two parallel racks (92, 94), so that simultaneously: a free end portion of the non-fluted cylindrical shaft rolls on a first (92) of the two parallel racks to form the free end portion (50) of the fluted shaft (46), and - An intermediate portion of the non-fluted cylindrical shaft rolls on a second (94) of the two parallel racks to form the intermediate portion (52) of the fluted shaft (46). Manufacturing method according to claim 13, characterized in that before, during or after machining the free end portion and the intermediate portion of the splined shaft, a tool is machining an annular groove (70) separating the ribs guide (54) of the machining ribs (60), such that the groove (70) has sharp edges (72) of intersection with the machining ribs (60). Manufacturing method according to claim 13 to 14, characterized in that the second rack (94) has chamfered teeth at their end adjacent to the first rack (92) and / or the first rack (92) has chamfered teeth at their end adjacent to rack (94).