FR3053749A1 - BEARING BEARING - Google Patents

Abstract

The invention relates to a bearing comprising an outer member (1), an inner member (2) and at least one row (4a, 4b) of spherical rollers (4) retained by a cage (5a, 5b) in the space of bearing (3), said cage (5a, 5b) having an outer ring (6), an inner ring (7) and a plurality of bridges (8) forming a housing in which a roll (4) is retained, guiding the rollers (4) in the running space (3) being formed in combination by a free edge (10) of the inner ring (7) which is arranged in contact with the outer member (1) and a set of two lugs (13) formed on each of the sides of a bridge (8) to protrude into a housing, each roller (4) being guided in rotation in a housing by contacting said lugs of said housing on respectively a surface of said roller which is located externally with respect to a primitive plane (P) of said roll

Description

© Publication number:

(to be used only for reproduction orders)

©) National registration number ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

053 749

56638

COURBEVOIE © Int Cl ⁸ : F16 C 19/38 (2017.01)

PATENT INVENTION APPLICATION

A1

©) Date of filing: 11.07.16. (© Priority: © Applicant (s): NTN-SNR ROULEMENTS - FR. @ Inventor (s): RAMBAUD LAURENT. ©) Date of availability of the request: 12.01.18 Bulletin 18/02. ©) 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.

(54 / ROLLING BEARING.

FR 3 053 749 - A1 yVj The invention relates to a bearing comprising an external member (1), an internal member (2) and at least one row (4a, 4b) of spherical rollers (4) retained by a cage (5a, 5b) in the rolling space (3), said cage (5a, 5b) having an outer ring (6), an inner ring (7) and a plurality of bridges (8) forming a housing in which a roller (4 ) is retained, the guiding of the rollers (4) in the rolling space (3) being carried out in combination by a free edge (10) of the internal crown (7) which is arranged in contact on the external member (1 ) and a set of two lugs (13) formed on each side of a bridge (8) to project into a housing, each roller (4) being guided in rotation in a housing by bringing said lugs into contact with said housing on respectively a surface of said roller which is located externally relative to a primitive plane (P) of said roller

The invention relates to a rolling bearing comprising an external member and an internal member each provided with at least one annular rolling track forming between said members a rolling space, at least one row of spherical rollers being retained in the space of rolling by means of a cage for, while rolling on the tracks, allowing the relative rotation of the members.

In particular, the invention applies to roller bearings of the spherical type on rollers in which the internal member has two rolling tracks on each of which a row of spherical rollers is arranged, the external member having a rolling track spherical in which the two rows of rollers are arranged in order to allow angular swiveling of said members.

To guide the cage in the rolling space, it is known, in particular from document EP-1 884 669, to put a free edge of the external crown of said cage in contact with the internal member. Furthermore, each roller is guided in rotation in a housing of the cage by contacting pins of said housing respectively on a surface of said roller which is located externally with respect to a primitive plane of said roller.

However, the centering of the cage thus produced depends on the play between the free edge and the internal member. In particular, in the event of increased play, there is a possibility of displacement of the cage relative to the row of rollers, which may lead to centering of said cage on said row and / or to loss of the guide contacts of the rollers on the lugs.

In addition, in the case where the internal member is mounted rotating, the vibrations generated by the pivoting of the rollers increase, in particular at high speed, the risks of off-center of the cage around said rotating member and / or loss of guidance of the rollers in housing.

Document EP-0 399 297 teaches the possibility of centering a cage by bringing a free edge of its internal crown into contact with the external member, and this in combination with a ring for guiding the rollers in the rolling space which is located between the inner raceways to be in contact with the inner faces of the rollers.

This embodiment, if it makes it possible to improve the guiding of the cage by centering it with respect to the external member, is not satisfactory in that, in addition to the complex manufacture of the guide ring, its use results in a significant torque friction of the rollers on it during the rotation of the bearing. This torque is all the more important as the rollers are liable to pivot during rotation, also inducing vibrations, especially at high speed.

The invention aims to improve the prior art by proposing in particular a rolling bearing, preferably with spherical roller bearings, the guiding of the spherical rollers in the rolling space is improved.

To this end, the invention provides a rolling bearing comprising an external member and an internal member each provided with at least one annular rolling track forming between said members a rolling space, at least one row of spherical rollers retained by a cage being arranged in said space to allow relative rotation of said members, said cage having an outer crown, an inner crown and a plurality of bridges extending between said crowns so as to form between two adjacent bridges and a segment of each of said crowns a housing in which a roller is retained, the guiding of the rollers in the rolling space being carried out in combination by a free edge of the internal crown which is arranged in contact on the external member in order to guide the cage in the rolling space and a set of two lugs formed on each side of a bridge to project into a housing, each roller being guided in rotation in a housing by contacting said lugs of said housing respectively on a surface of said roller which is located externally relative to a primitive plane of said roller.

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

- Figure 1 is a perspective view of a rolling bearing according to an embodiment of the invention, showing the members in the fully swiveling position;

- Figure 2 shows in perspective a retention cage of the rolling bearing of Figure 1;

FIG. 3 is a view in axial half-section of the rolling bearing of FIG. 1.

In relation to the figures, there is described below a rolling bearing comprising an outer member 1 and an inner member 2 each provided with at least one annular track 1a, 2a, 2b of rolling forming between said members a rolling space 3 .

To allow the relative rotation of the members 1, 2, at least one row 4a, 4b of spherical rollers 4 retained by a cage 5a, 5b is arranged in the rolling space 3. By spherical is meant a cylindrical roller 4 having a generator in an arc.

In the description, the terms "exterior" and "interior" are defined with respect to the axis of rotation of the rotary member 2, respectively for a location that is distant and close to said axis. The terms "axial" and "radial" are also defined with respect to this axis, respectively for a direction along this axis and moving away from or approaching it. Furthermore, the terms “external” and “internal” are taken in reference to the landing, namely towards the center of the landing for “internal” and opposite for “external”.

The cage 5a, 5b has an outer ring 6 arranged in an outer side of the rolling space 3, an inner ring 7 and a plurality of bridges 8 extending between said rings so as to form between two adjacent bridges 8 and a segment of each of said crowns a housing 9 in which a roller 4 is retained in row 4a, 4b.

In particular, the internal crown 7 is formed around the bridges 8 by extending externally to a free edge 10, the external crown 6 extending inside the bridges 8. Furthermore, each bridge 8 has a first portion 8a connected to the internal crown 7 and a second portion 8b connected to the external crown 6, said portions forming between them an angle inscribed a which is strictly less than 180 °. Advantageously, the cage 5a, 5b can be made of metallic material, in particular of sheet steel.

In the embodiment shown, the bearing comprises two rows 4a, 4b of spherical rollers 4 which are retained by a cage 5a, 5b respectively while being axially spaced in the rolling space 3. In particular, the cages 5a, 5b are identical and are arranged in the rolling space 3 with their internal rings 7 arranged in axial view.

The inner member 2 has two tracks 2a, 2b of rolling on each of which a row 4a, 4b of spherical rollers 4 is arranged, the outer member 1 having a track 1a of spherical bearing in which the two rows 4a, 4b of rollers 4 are arranged.

Such a rolling bearing, conventionally called a ball joint on rollers, allows angular swiveling of the members 1, 2 by allowing their relative rotation under misalignment, that is to say when the respective axes of each of the members 1, 2 form a angle between them. Thus, this type of bearing is particularly suitable for guiding in rotation a rotating shaft with respect to a fixed structure, in which the axis of rotation of said shaft can fluctuate.

In addition, as shown in FIG. 1, complete swiveling of the members 1, 2, that is to say by arranging their respective axes at 90 °, allows the assembly of the bearing as well as its maintenance, in particular relative to the bearing space lubrication 3.

To guide the cage 5a, 5b in the rolling space 3, the internal ring 7 has a free edge 10 which is arranged in contact with the external member 1. In the embodiment shown, each of the cages 5a , 5b has an internal ring 7 whose free edge 10 is disposed in contact with the external member 1. More specifically, the free edges 10 of the internal rings 7 are arranged in contact on the external raceway 1a, said internal rings being arranged in axial abutment one on the other.

The outer ring 6 has a free edge 11 which is disposed radially opposite the inner member 2 by forming a clearance J. Thus, the clearance J avoids bringing the outer crown 6 into contact with the inner member 2. D 'other hand, the game J can be arranged to form a deflector at the outer side of the bearing space 3, in particular to limit the leakage of lubricant present in said space as well as the entry of pollutants in said space. Conversely, the clearance J can be increased to promote a flow of lubricant supplying the rolling space 3 from one of its sides.

This embodiment of guiding the cage 5a, 5b on the outer member 1 is particularly advantageous in the case of a bearing whose outer member 1 is intended to be mounted fixed, the inner member 2 being intended to be mounted rotating . Indeed, the rotation constraints of the inner member 2 do not have a direct impact on the cage 5a, 5b, which limits the risks of off-center but also of breakage of the said cage in the event of an impact on the said inner member.

In the embodiment shown, the internal ring 7 has a cylindrical geometry on which the free edge 10 is formed. Thus, the free edge 10 defines an external diameter which is substantially equal to the diameter of the external raceway 1a, in order to achieve the expected centering contact.

In addition, the internal crown 7 has at least one flat 12, in particular two diametrically opposite flat 12 in the embodiment shown. The presence of the flats 12 makes it possible to mount the cage 5a, 5b in the outer raceway 1a, in particular by providing a radial dimension of the internal ring 7 which is less than the entry diameter of said track.

To guide the rollers 4 in the rolling space 3, in combination with the free edges 10, each side of a bridge 8 is equipped with a set of two lugs 13 projecting into a housing 9, each roller 4 being guided in rotation in a housing 9 by contacting said lugs of said housing respectively on a surface of said roller which is located externally relative to a primitive plane P of said roller.

Thus, the contact of the free edge 10 on the external member 1 constrains the bearing of the lugs 13 on the rollers 4 so that a possible displacement of the cage 5a, 5b in the rolling space 3 induces a strengthening of the guiding the rollers 4 in the housings 9, in particular making it possible to avoid their crossing in said space. The kinematic behavior of the bearing then becomes more stable, in particular in that the rotational vibrations are reduced due to the improvement of the guidance of the rollers 4.

In addition, as shown in FIG. 3, the rollers 4 of each of the rows 4a, 4b are arranged axially opposite in the rolling space 3, in particular without the interposition of a guide ring, which makes it possible not to generate of torque, in particular by friction in the event of a relative displacement of a row 4a, 4b relative to said ring.

According to one embodiment, the lugs 13 can be formed according to the teachings of document FR-2 976 640. In particular, each lug 13 can have a peripheral guide facet forming an internal edge with the bridge 8.

Advantageously, the two lugs 13 of a set are axially spaced in the housing 9, in particular by providing that the lugs 13 of a set are disposed respectively on a portion 8a, 8b of a bridge 8. As a variant, as provided by document FR-2 976 640, each bridge 8 may have a central portion which connects the first 8a and second 8b portions, the pins 13 of a set being arranged on said central portion.

Claims (15)

1. Rolling bearing comprising an external member (1) and an internal member (2) each provided with at least one annular track (1a, 2a, 2b) for rolling forming between said members a rolling space (3), at at least one row (4a, 4b) of spherical rollers (4) retained by a cage (5a, 5b) being arranged in said space to allow the relative rotation of said members, said cage (5a, 5b) having an external crown (6) , an internal crown (7) and a plurality of bridges (8) extending between said crowns so as to form between two adjacent bridges (8) and a segment of each of said crowns a housing (9) in which a roller (4 ) is retained, said bearing being characterized in that the guiding of the rollers (4) in the rolling space (3) is carried out in combination by a free edge (10) of the internal crown (7) which is arranged in contact on the external member (1) to guide the cage (5a, 5b) in the rolling space (3) and a j had two pins (13) formed on each side of a bridge (8) to project into a housing (9), each roller (4) being guided in rotation in a housing (9) by bringing said pins into contact of said housing on respectively a surface of said roller which is situated externally with respect to a primitive plane (P) of said roller. 2. Rolling bearing according to claim 1, characterized in that the two lugs (13) of a set are axially spaced in the housing (9). 3. Rolling bearing according to one of claims 1 or 2, characterized in that each bridge (8) has a first portion (8a) connected to the internal crown (7) and a second portion (8b) connected to the crown external (6), said portions forming between them an inscribed angle (a) which is strictly less than 180 °. 4. Rolling bearing according to claims 2 and 3, characterized in that the lugs (13) of a set are disposed respectively on a portion (8a, 8b) of a bridge (8). 5. Rolling bearing according to claims 2 and 3, characterized in that each bridge (8) has a central portion which connects the first (8a) and second (8b) portions, the pins (13) of a set being arranged on said central portion. 6. Rolling bearing according to any one of claims 1 to 5, characterized in that the outer ring (6) has a free edge (11) which is arranged radially facing the inner member (2) forming a game (J). 7. Rolling bearing according to any one of claims 1 to 6, characterized in that the internal ring (7) has a cylindrical geometry on which the free edge (10) is formed, said internal ring having at least one flat ( 12). 8. Rolling bearing according to claim 7, characterized in that the internal ring (7) has two flats (12) diametrically opposite. 9. Rolling bearing according to any one of claims 1 to 8, characterized in that the internal ring (7) is formed around the bridges (8) extending externally to the free edge (10). 10. Rolling bearing according to any one of claims 1 to 9, characterized in that the outer ring (6) extends inside the bridges (8). 11. Rolling bearing according to any one of claims 1 to 10, characterized in that it comprises two rows (4a, 4b) of spherical rollers (4) which are retained by a cage respectively (5a, 5b) being axially spaced in the rolling space (3), each of said cages having an internal ring (7) whose free edge (10) is disposed in contact with the external member (1) and a set of two lugs (13) formed on each side of a bridge (8) to project into a housing (9). 12. Rolling bearing according to claim 11, characterized in that the internal member (2) has two tracks (2a, 2b) of rolling on each of which a row (4a, 4b) of spherical rollers (4) is arranged, the external member (1) having a spherical rolling track (1a) in which the two 5 rows (4a, 4b) of rollers (4) are arranged to allow angular swiveling of said members. 13. Rolling bearing according to claim 12, characterized in that the free edges (10) of the inner rings (7) are arranged in contact on the track 10 outer bearing (1a). 14. Rolling bearing according to any one of claims 11 to 13, characterized in that the internal crowns (7) of each of the cages (5a, 5b) are arranged in axial view in the bearing space (3). 15. Rolling bearing according to any one of claims 1 to 14, characterized in that the external member (1) is intended to be fixedly mounted, the internal member (2) being intended to be rotatably mounted. 1/2 2/2