FR3058486A1 - BEARING BEARING HUB - Google Patents

Abstract

The invention relates to a rolling bearing hub comprising a barrel (1) equipped with a flange (5) extending radially around said barrel having N conduits (6) angularly distributed to allow the association of an element hub, said flange having an annular extension (7) whose inner wall (9) defines a cavity (10) which opens into an outer side of said barrel, the inner wall (9) having N discrete ribs (12) which are distributed angularly around said cavity.

Description

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,058,486 (to be used only for reproduction orders)

©) National registration number: 16 60920

COURBEVOIE © Int Cl ⁸ : F16 C 35/00 (2017.01), F16C 19/14

A1 PATENT APPLICATION

©) Date of filing: 10.11.16. (© Priority: © Applicant (s): NTN-SNR ROULEMENTS - FR. ©) Date of availability of the request: 11.05.18 Bulletin 18/19. @ Inventor (s): CHESNE JEAN and MOREL BERTRAND. ©) List of documents cited in the preliminary search report: See the end of this booklet (© References to other related national documents: ® Holder (s): NTN-SNR ROULEMENTS. ©) Extension request (s): (© Agent (s): STRATO-IP Limited liability company.

(04) BEARING BEARING hub.

FR 3 058 486 - A1 _ The invention relates to a rolling bearing hub comprising a barrel (1) fitted with a flange (5) extending radially around said barrel having N conduits (6) distributed angularly to allow the association of an element to said hub, said flange having an annular extension (7) whose inner wall (9) defines a cavity (10) which opens into an external side of said barrel, the inner wall (9) having N discrete ribs (12) which are angularly distributed around said cavity.

The invention relates to a rolling bearing hub, as well as a rolling bearing comprising such a hub and an external member disposed around said hub for mounting in relative rotation of two elements.

The invention applies more particularly to the mounting of a rolling assembly of a vehicle, in particular a motor vehicle, on a suspension element of said vehicle, said rolling assembly comprising in particular a wheel and a brake disc.

For the mounting of such a rolling assembly, bearings are known in which the external member and the hub each carry at least one raceway which are arranged opposite to produce at least one raceway in which a row of bodies roller is arranged to allow relative rotation of the hub and the external member.

According to one embodiment, the hub comprises a barrel around which the external member is rotatably mounted, said barrel being equipped with a flange which extends radially around said barrel by presenting conduits distributed angularly to allow the association of a element at the hub. Thus, by associating the external member with a vehicle suspension element, the rolling assembly can be rotated by fixing it to the flange.

In addition, the flange may have an annular extension extending axially from an external side of the barrel, the rolling assembly having a cavity which is disposed around said annular extension ensuring perfect concentricity of the mounting of said rolling assembly on the front flange. its fixing in the conduits.

By integrating the different functions and the resulting mechanical stresses, the rolling bearings are relatively massive, which poses problems of weight, size and costs.

To solve these problems, it has been proposed to produce hubs with localized thinnings of material, in particular at the level of the less mechanically stressed parts of the bearing, in order to optimize the weight of said hubs without compromising their mechanical strength.

It is also known to provide a flange of reduced thickness which has an annular extension whose internal wall defines a cavity which opens into an external side of the barrel. In addition, to further lighten the hub, the outer side of the barrel may have a recess in which the cavity of the annular extension opens.

However, the rigidity of such a hub may prove to be insufficient for stresses of large amplitude. In particular, during use of the hub, the flange and the barrel are highly stressed, in particular in rotary bending of the barrel, which can cause deformations of the hub at the junction between said barrel and said flange.

The object of the invention is to improve the prior art by proposing in particular a rolling bearing hub which is arranged to optimize the compromise between weight and mechanical rigidity, in particular relative to the rotary bending of the barrel.

To this end, according to a first aspect, the invention provides a rolling bearing hub comprising a barrel equipped with a flange extending radially around said barrel having N conduits distributed angularly to allow the association of an element to said hub, said flange having an annular extension whose inner wall defines a cavity which opens into an outer side of said barrel, the inner wall having N discrete ribs which are angularly distributed around said cavity.

According to a second aspect, the invention provides a rolling bearing for mounting in relative rotation of two elements, said bearing comprising such a hub and an external member disposed around said hub, said external member and the barrel of said hub each carrying at least a raceway which are arranged opposite to produce at least one raceway in which a row of rolling bodies is arranged in order to allow the relative rotation of the hub and of the external member.

Other objects and advantages of the invention will appear in the following description, made with reference to the appended figures, in which:

- Figures 1a, 1b show a hub of a rolling bearing according to an embodiment of the invention, respectively in external perspective (Figure 1a) and in longitudinal section (Figure 1b);

- Figure 2 shows an enlarged view of part of the outer side of the hub of Figures 1a and 1b.

- Figures 3 and 4 show views similar to Figure 2 for bearings respectively according to a first and a second alternative embodiment of the invention.

In relation to these figures, a rolling bearing is described below for mounting in relative rotation of two elements, said bearing comprising a hub and an external member (not shown) arranged around said hub. In the description, the terms “exterior” and “interior” are defined with respect to the axis X of rotation of the bearing, respectively for a location distant and close to said axis.

In the embodiment shown, the bearing is intended for mounting a rolling assembly of a vehicle, in particular a motor vehicle, on a suspension element of said vehicle, said rolling assembly comprising in particular a wheel and a brake disc.

To do this, the hub comprises a barrel 1 mounted to rotate in the external member, the external member having means of association with a suspension element of the vehicle. However, the invention is not limited to such an application and can be applied to an assembly in which the external member is rotating and the hub is fixed.

In addition, the hub shown in the figures is intended for mounting a non-driving wheel, but the invention can also be applied to mounting a driving wheel, by equipping the barrel 1 with a bore. axial for mounting an element for transmitting an engine torque intended to be actuated in rotation by the vehicle engine.

Advantageously, the periphery of the barrel 1 is arranged to allow the mounting in rotation around it of at least one external member of the rolling bearing. In particular, the periphery of the barrel 1 and the external member each carry at least one raceway 2 which are arranged opposite to produce at least one raceway in which a row of rolling bodies is arranged, in order to allow rotation relative of the hub in the external member.

In the embodiment shown, the barrel has an external raceway 2 and an internal race 3 intended to receive a ring on which an internal raceway is formed, the free edge 4 of said range being foldable, as shown in FIG. 1b, to form an axial preload collar of said ring on the periphery of the barrel 1. In the description, the terms “external” and “internal” are defined relative to the mounting of the bearing on the vehicle, respectively to the left and on the right in figure 1 b.

To allow the association of a rolling assembly with the hub, the barrel 1 is equipped with a flange 5 which extends radially around said barrel having N association conduits 6 distributed angularly, N being a non-zero natural integer.

In particular, the flange 5 has an annular extension 7 which extends axially from an external side of the barrel 1, the rolling assembly having a bore which is arranged around said annular extension ensuring perfect concentricity of the mounting of said rolling assembly on said flange before being fixed in the conduits 6.

Furthermore, the flange 5 has an indexing orifice 8, in which a complementary lug of the rolling assembly can be inserted during the arrangement of said rolling assembly on the annular extension 7, in order to allow the alignment of each conduit d association 6 with a conduit for fixing said rolling assembly, and thus allow the association of said rolling assembly on the hub by tightening a screw in each of said alignments of conduits.

The hub is made in one piece, for example by forging, and can be optimized, in particular at the level of the material constituting it, relative to the mechanical forces which it must resist. Advantageously, the hub can be made of a metallic material, in particular of bearing steel of the 100Cr6 type, to allow the barrel 1 to withstand the rolling contact pressures and the flange 5 to withstand the mechanical stresses coming from the assembly. rolling.

To optimize its weight without compromising its mechanical strength, the hub may have localized thinnings of material, in particular at the level of the less mechanically stressed parts of the bearing.

In particular, the annular extension 7 has an inner wall 9 which defines a cavity 10 opening into an outer side of the barrel 1. In the embodiments shown, the inner wall 9 has an outer surface 9a which is substantially cylindrical and an inner surface 9b frustoconical. Furthermore, the external side of the barrel 1 has a recess 11 into which the internal portion of the cavity 10 opens which is defined by the frustoconical bearing 9b.

The inner wall 9 has N discrete ribs 12, namely the same number N as conduits 6, which are angularly distributed around the cavity 10, in order to locally stiffen the hub, in particular at the junction between the flange 5 and the barrel 1 , in order to optimize the compromise between its weight and its rigidity, in particular relative to the rotary bending of the barrel 1.

In the embodiments shown, the frustoconical internal bearing 9b is arranged in axial view of the rolling track 2 of the barrel 1, the ribs 12 being formed in relief on said frustoconical internal bearing, in particular also coming on the internal edge of the external scope 9a for locally connecting said scopes to one another.

Thus, discrete axial thicknesses C are brought in axial view of the rolling track 2, in particular in order to limit the risks of deformation of the hub due to the contact pressures of the bearing exerted on said barrel, in particular in rotary bending thanks to the bridges formed. by the ribs 12 on the inner wall 9.

The N association conduits 6 and the N stiffening ribs 12 can be distributed angularly according to the same succession of angular pitch, in order to arrange the stiffening ribs 12 according to the same angular distribution as that of the association conduits 6, and thus provide similar rigidity between each of the conduits 6 and the barrel 1.

In the embodiment shown, the hub comprises four association conduits 6 and four stiffening ribs 12 which are angularly distributed, and more particularly according to the same angular pitch, in particular of the order of 90 °.

In addition, in the figures, each rib 12 is in the radial extension of a conduit 6, which makes it possible to provide greater rigidity in the radial direction at the level of each conduit 6. In a variant not shown, each rib 12 can be arranged substantially equidistant from two conduits 6, that is to say according to an angular distribution which is offset by 45 ° relative to that of the four conduits 6 shown.

Each rib 12 is angularly delimited by two lateral edges 13 connected by an internal face 14 and by an external face 15, forming radiated facets 16 between them, in order to avoid concentrations of stresses on said ribs. In particular, the facets 16 each have a radius of curvature of between 2 and 8 mm.

The inner face 14 extends substantially axially with a positive clearance angle 5, in particular in order to facilitate the production of the hub. In addition, the external face 15 extends substantially radially from the external end of the internal face 14.

Advantageously, the axial dimension B of the internal face 14, measured 10 from the external face 15 to the wall 9 of the cavity 10, is between

50% and 150% of the thickness A of the material of the hub which is arranged in the axial extension of said inner face.

In the embodiments shown, the thickness of the hub A is measured from the rolling track 2 of the barrel 1, in particular between the base of the inner face 14 of a rib 12 and said rolling track, and corresponds to the axial dimension measured between the frustoconical inner surface 9b and said raceway. Thus, the value of a discrete allowance C corresponds to the sum of the thickness A and the axial dimension B of a rib 12.

In addition, the lateral edges 13 of a rib 12 extend in planes P which form between them an angle a of between 20 ° and 150 °. In particular, FIGS. 2 to 4 show ribs 12 whose angle a has a value respectively of the order of 25 ° (FIG. 2), 90 ° (FIG. 3) and 120 ° (FIG. 4), the increase of the angle a making it possible to increase the volume of the ribs 12 and therefore the rigidity imparted.

Claims (15)

1. Rolling bearing hub comprising a barrel (1) equipped with a flange (5) extending radially around said barrel having N conduits (6) angularly distributed to allow the association of an element to said hub, said flange having an annular extension (7) whose inner wall (9) defines a cavity (10) which opens into an outer side of said barrel, said hub being characterized in that the inner wall (9) has N discrete ribs (12) which are angularly distributed around said cavity. 2. Hub according to claim 1, characterized in that the N conduits (6) and the N ribs (12) are angularly distributed in the same succession of angular steps. 3. Hub according to one of claims 1 or 2, characterized in that the N conduits (6) and the N ribs (12) are angularly distributed. 4. Hub according to claims 2 and 3, characterized in that the N conduits (6) and the N ribs (12) are distributed angularly according to the same angular pitch. 5. Hub according to claim 4, characterized in that each rib (12) is in the radial extension of a conduit (6). 6. Hub according to claim 4, characterized in that each rib (12) is arranged substantially equidistant from two conduits (6). 7. Hub according to any one of claims 1 to 6, characterized in that the external side of the barrel (1) has a recess (11) into which the cavity (10) opens. 8. Hub according to any one of claims 1 to 7, characterized in that the inner wall (9) has an outer surface (9a) substantially cylindrical and an inner surface (9b) frustoconical, the ribs (12) being formed in relief on said internal surface. 9. Hub according to any one of claims 1 to 8, characterized in that each rib (12) is angularly delimited by two lateral edges (13), said lateral edges being connected by an inner face (14) and by a face external (15) by forming radiated facets (16) between them. 10. Hub according to claim 9, characterized in that the lateral edges (13) extend in planes (P) which form between them an angle (a) between 20 ° and 150 °. 11. Hub according to one of claims 9 or 10, characterized in that the inner face (14) extends substantially axially with a positive clearance angle. 12. Hub according to any one of claims 9 to 11, characterized in that the external face (15) extends substantially radially. 13. Hub according to any one of claims 9 to 12, characterized in that the axial dimension (B) of the inner face (14) is between 50% and 150% of the thickness (A) of material of the hub which is arranged in the axial extension of said inner face. 14. Hub according to claim 13, characterized in that the periphery of the barrel (1) has a rolling track (2), the thickness (A) of the hub being measured from said track. 15. Rolling bearing for mounting in relative rotation of two elements, said bearing comprising a hub according to any one of claims 1 to 14 and an external member disposed around said hub, said external member and the barrel (1) of said hub each carrying at least one raceway (2) which are arranged opposite to produce at least one raceway in which a row of rolling bodies is arranged in order to allow the relative rotation of the hub and the external member. 1/3