FR3055927A1 - BEARING RING FORMED OF TWO SEGMENTS - Google Patents

Abstract

The invention relates to a bearing ring comprising a bore (1) for the rotational mounting of a rotating member, said ring being formed of two segments (2) of ring which are assembled along their respective longitudinal edges (3) to form an inner annular surface (4) extending continuously over said bore and an outer annular surface (5), said ring being conditioned with the ring segments (2) assembled by means of at least one element (10) surrounding the surface outer (5) holding said ring segments in relative position. The invention also relates to a method for producing such a bearing ring.

Description

055 927

58655 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:

(to be used only for reproduction orders)

©) National registration number

COURBEVOIE © Int Cl ⁸ : F16 C 33/46 (2017.01)

PATENT INVENTION APPLICATION

A1

©) Date of filing: 15.09.16. (© Priority: © Applicant (s): NTN-SNR ROULEMENTS - FR. ©) Date of public availability of the request: 16.03.18 Bulletin 18/11. @ Inventor (s): PAQUIEN MARC and SORLUT MARTIAL. ©) 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.

BEARING RING FORMED OF TWO SEGMENTS.

FR 3 055 927 - A1 _ The invention relates to a bearing ring comprising a bore (1) for the rotational mounting of a rotating member, said ring being formed of two ring segments (2) which are assembled along their edges respective longitudinal (3) to form an inner annular surface (4) extending continuously over said bore and an outer annular surface (5), said ring being conditioned with the ring segments (2) assembled by means of at least one element (10) surrounding the outer surface (5) while maintaining said ring segments in relative position. The invention also relates to a method of producing such a rolling ring.

The invention relates to a rolling ring comprising a bore for the rotational mounting of a rotating member, as well as a method of producing such a rolling ring.

The invention applies in particular to the rotational mounting of a rotating member in the bore of a fixed bearing ring, at least one row of rolling bodies being disposed in abutment between said bore and the periphery of said member to ensure the guiding said rotation.

In certain applications, in particular for the rotational mounting of a camshaft of a motor vehicle engine, the structure of the rotating member prevents its fitting by fitting into the bore of the bearing ring. To carry out the assembly, a rolling ring is then used formed of two ring segments, each of said segments being able to be arranged independently around the rotating member before being assembled together to form the rolling ring.

In particular, the segments are assembled along their respective longitudinal edges to form an inner annular surface extending continuously over the bore and an outer annular surface, said inner surface having to be ground in order to be able to support the row of rolling bodies.

To guarantee perfect continuity of the interior surface, the segments are obtained from a cylindrical ring which is broken, in particular at the level of two grooves, to form two semi-cylindrical half-rings.

This solution, if it is satisfactory from an assembly point of view, poses a problem of conditioning the segments before said assembly, since two segments are necessarily matched in a unique manner to guarantee the geometry of the assembled bearing ring.

The invention aims to solve this problem by proposing optimal conditioning of the ring segments before their assembly.

Furthermore, to benefit from its mechanical cohesion, the rectification of the interior surface is conventionally carried out before the cylindrical ring breaks. However, subsequent rupture can induce defects at the level of the rectified inner surface, which goes against the reliability of the guide in rotation, in particular by being a source of noise and premature wear.

The invention also aims to solve this problem by proposing a conditioned bearing ring whose inner surface can be optimally rectified.

To this end, according to a first aspect, the invention provides a rolling ring comprising a bore for the rotational mounting of a rotating member, said ring being formed of two ring segments which are assembled along their respective longitudinal edges to form an inner annular surface extending continuously over said bore and an outer annular surface, said ring being conditioned with the ring segments assembled by means of at least one element surrounding the external surface while maintaining said ring segments in relative position.

According to a second aspect, the invention proposes a method for producing such a rolling ring, said method providing for a massive cylindrical ring in which the two ring segments are formed, the holding element being arranged around the external surface. of said ring then said ring being broken by forming said assembled segments according to their respective longitudinal edges.

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

- Figure 1 schematically shows the steps of a method of producing a bearing ring according to an embodiment of the invention;

- Figures 2a and 2b are representations of a bearing ring according to an embodiment of the invention, respectively in exploded perspective (Figure 2a) and conditioned (Figure 2b);

- Figure 3 is a representation of a bearing ring according to an embodiment of the invention;

- Figures 4a and 4b are representations of a bearing ring according to an embodiment of the invention, respectively conditioned (Figure 4a) and being unpacked (Figure 4b).

In relation to these figures, a bearing ring is described below comprising a bore 1 for the rotational mounting of a rotating member, in particular of a camshaft of an engine of a motor vehicle, without however that the invention is limited to such an application.

In particular, at least one row of rolling bodies is placed in abutment between the bore 1 and the periphery of the member in order to guide the rotation.

To allow its mounting around the member, the rolling ring is formed of two ring segments 2 which can be arranged independently around the rotating member before being assembled together to form the rolling ring. In particular, the two ring segments 2 are assembled along their respective longitudinal edges 3 to form an inner annular surface 4 extending continuously over the bore 1 and an outer annular surface 5.

The inner surface 4 is corrected so as to be able to receive, in support, at least one row of rolling bodies ensuring the guiding in rotation of the rotating member.

According to an advantageous embodiment, the rolling ring is produced by providing a massive cylindrical ring 8 in which the two ring segments 2 are formed, said ring being broken by forming said segments assembled according to their respective longitudinal edges 3. Thus, by breaking the ring 8, the two segments 2 are separated.

In relation to the figures, the ring segments 2 are of semi-cylindrical geometry to form two half-rings, in particular made of hardened bearing steel. In particular, two grooves 7 can be made on the solid cylindrical ring 8, said grooves not opening into the bore 1 to form breakable bridges 6 for association of the ring segments 2. Thus, after the bridges 6 have broken, the ring 8 is broken, forming two notches 9 at the interface of two longitudinal edges 3 of a ring segment 2, respectively.

The bearing ring is packaged with the ring segments 2 assembled by means of at least one element 10 surrounding the outer surface 5 while maintaining said ring segments in relative position.

Thus, the bearing ring is conditioned by guaranteeing the pairing of the segments 2, in particular making it possible to avoid any mixing of said segments during the mounting of the bearing ring around the member. In particular, this packaging makes it possible to use conveying processes which are of the same type as those used for solid bearing rings in one piece, said packaging being able to be kept until the ring segments 2 are mounted around the rotating organ. Furthermore, the retaining element 10 can be transparent to allow a vision of the external surface 5 through.

To secure the pairing, the retaining element 10 can be arranged around the outer surface 5 (step b of FIG. 1) before the ring 8 breaks (steps d and e of FIG. 1) to condition the ring bearing with the ring segments 2 assembled in their relative position.

Advantageously, as shown in step f of FIG. 1, the rolling ring can be produced by providing, after the ring 8 is broken by breaking the bridges 6, a rectification of the inner surface 4 of the ring. bearing conditioned by the holding element 10.

Thus, the retaining element 10 makes it possible to maintain the cohesion of the rolling ring after the bridges 6 have broken, so as to be able to control the rectification of the internal surface 4 formed by the segments 2, in particular relative to their arrangement in the grinding machine with said continuous interior surface.

In particular, in the event of the formation of defects during the rupture of the internal surface 4, in particular at the level of the notches 9, its subsequent rectification makes it possible to correct these defects and therefore to obtain perfect rectification to make the rotation of the organ more reliable. in the bearing ring.

In addition, a rectification of the outer surface 5 can be provided before the holding element 10 is available, in particular for the formation of the grooves 7 (step a in FIG. 1) which can in particular have a rounded section. The grooves 7 can be rectilinear, extending axially or being inclined, or rounded.

Then, as shown in steps d and e of FIG. 1, the bridges 6 are broken by application of a radial force opposite the grooves 7. In particular, the ring 8 can be placed in abutment on a groove 7 while 'A press 11 presses internally, for example in spurts, on the other groove 7 until the rupture of the groove 7 in support (step d of Figure 1). Then, the ring 8 is rotated 180 ° to break the other groove 7 in the same way (step e in Figure 1).

In relation to FIGS. 2, a holding element 10 is in the form of a ring 10a elastically surrounding the external surface 5. In particular, the embodiment shown provides two rings 10a which are each engaged in an annular groove 12 formed in the outer surface 5. In particular, the grooves 12 are axially spaced to form geometric means on which each of the rings 10a is immobilized axially.

In relation to FIGS. 3 and 4, the retaining element 10 is in the form of a film 10b shrunk around the outer surface 5. In this embodiment, the ring 8 can be inserted in a film sleeve 10b of dimension desired, said sleeve then being retracted around the outer surface 5.

In particular, a thermal shrinkage of the film 10b can be carried out after it has been placed around the outer surface 5 (step c of FIG. 1), for example by blowing hot air and / or by heating the ring 8. As a variant, the use of a stretchable film 10b can be envisaged as a holding element 10.

In FIG. 3, the film 10b is placed in the central part of the external surface 5, without completely covering it. In FIGS. 4, the film 10b entirely covers the external surface 5, and also extends at least partially in axial view from at least one side of the bore 1. Thus, by varying the geometry of the film sleeve 10b , it is possible to place it on the areas of segments 2 by which they must be maintained.

More specifically, FIGS. 4 show a film 10b having a re-entrant edge 13 on each side of the bore 1, said edges surrounding each side of the bore 1 to make the retention of the ring segments 2 more reliable, in particular during breakage of the ring 8. In addition, the re-entrant edges 13 make it possible to retain any projections when the ring 8 breaks.

According to an embodiment in which the inner surface 4 is rectified on the conditioned rolling ring, it is possible to cut beforehand at least a portion of at least one re-entrant edge 13 in order to facilitate access to the grinding tool, in particular through at least one bore 1, on said interior surface.

In particular, the film 10b then covers the edges of the outer surface 5 which may have been previously deburred in order to avoid tearing of said film, in particular in the event of shrinkage. Advantageously, the film 10b is arranged to protect the external surface 5 during the rupture of the bridges 6, in particular relative to the contacts with the press 11.

Furthermore, in relation to FIG. 4b, the holding element 10 has a gripping zone which is tearable in order to be able to separate the two ring segments. In particular, one of the edges 13 of the film 10b has a precut tab 14 which can be gripped manually in order to be able to tear said film with a view to unconditioning the rolling ring.

Claims (15)

1. Rolling ring comprising a bore (1) for mounting in rotation of a rotating member, said ring being formed of two ring segments (2) which are assembled along their respective longitudinal edges (3) to form an annular surface inner (4) extending continuously over said bore and an outer annular surface (5), said ring being characterized in that it is conditioned with the ring segments (2) assembled by means of at least one element (10 ) surrounding the outer surface (5) while maintaining said ring segments in relative position. 2. bearing ring according to claim 1, characterized in that the outer surface (5) has two notches (9) which are formed at the interface of two longitudinal edges (3) of a ring segment (2) respectively. 3. Rolling ring according to one of claims 1 or 2, characterized in that the ring segments (2) are of semi-cylindrical geometry to form two half-rings. 4. Rolling ring according to any one of claims 1 to 3, characterized in that at least one holding element (10) is in the form of a film (10b) retracted around the outer surface (5) . 5. Rolling ring according to any one of claims 1 to 4, characterized in that at least one holding element (10) is in the form of a ring (10a) elastically surrounding the outer surface (5). 6. bearing ring according to any one of claims 1 to 5, characterized in that the holding element (10) also extends at least partially in axial view of at least one side of the bore (1 ). 7. A rolling ring according to any one of claims 1 to 6, characterized in that the outer surface (5) has geometric means (12) on which the holding element (10) is immobilized axially. 8. Rolling ring according to any one of claims 1 to 7, characterized in that a holding element (10) has a gripping area (14) which is tearable to be able to separate the two ring segments (2) . 9. A rolling ring according to any one of claims 1 to 8, characterized in that the internal surface (4) is rectified so as to be able to receive in support at least one row of rolling bodies ensuring the guiding in rotation of the rotating member. . 10. A method of producing a rolling ring according to any one of claims 1 to 9, said method providing a massive cylindrical ring (8) in which the two ring segments (2) are formed, the holding element (10) being arranged around the outer surface (5) of said ring and then said ring being broken by forming said segments assembled according to their respective longitudinal edges (3). 11. Production method according to claim 10, characterized in that it provides, after the breakage of the massive cylindrical ring (8), a rectification of the interior surface (4). 12. Production method according to one of claims 10 or 11, characterized in that it provides for a rectification of the outer surface (5) prior to the provision of the holding element (10). 13. Production method according to any one of claims 10 to 12, characterized in that it provides for making two grooves (7) on the massive cylindrical ring (8), said grooves not opening into the bore (1 ) to form bridges (6) of association of the segments (2), the ring (8) being broken by rupture of said bridges. 14. The production method according to claim 13, characterized in that the 5 bridges (6) are broken by the application of a radial force opposite the grooves (7). 15. Production method according to any one of claims 10 to 14, characterized in that it provides for thermal shrinkage of the holding element 10 (10) after it has been placed around the outer surface (5).