Set of rolling bearings and corresponding rotary machine

Patent metadata

Field	Value
Publication number	US-9309922-B2
Application number	US-201314378585-A
Country	US
Kind code	B2
Filing date	Feb 7, 2013
Priority date	Feb 13, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

This set of roller bearings, which is a grounding bearing for a rotary machine, comprises a first-angular contact rolling bearing having a first outer race, a first inner race and first rolling elements, a second angular-contact rolling bearing having a second outer race, a second inner race and second rolling elements, a mount in which the first angular-contact rolling bearing and the second angular-contact rolling bearing are mounted. The first outer race and the second outer race are arranged in the mount either directly one beside the other or via the interposition of an intermediate member, the axial stiffness of which is greater than that of the mount and than those of the first and second outer races. Application for example to asynchronous motors.

First claim

What is claimed is:

1. A roller bearing set consisting of a bearing block for a rotating machine, the roller bearing set comprising:
a primary angular contact bearing with a primary external bushing, a primary internal bushing, and primary rolling elements;
a secondary angular contact bearing with a secondary external bushing, a secondary internal bushing, and secondary rolling elements; and
a chassis, wherein the primary angular contact bearing and the secondary angular contact bearing are mounted on the chassis,
wherein the primary external bushing and the secondary external bushing are positioned within the chassis, one immediately adjacent to the other.

2. The roller bearing set according to claim 1 , wherein the primary internal bushing is in contact with the secondary internal bushing.

3. The roller bearing set according to claim 1 , further comprising a housing, wherein the chassis is positioned within the housing, and the chassis is in contact with the housing, or a damper is in contact with the chassis and the housing.

4. The roller bearing set according to claim 1 , further comprising a damper positioned around the chassis, wherein the radial stiffness of the damper is lower than the radial stiffness of the primary angular contact bearing and the secondary angular contact bearing.

5. The roller bearing set according to claim 4 , wherein the damper is a corrugated sheet, wherein the corrugations of the corrugated sheet are circumferential or axial.

6. The roller bearing set according to claim 4 , wherein the damper is a corrugated metal sheet, and the corrugations of the corrugated metal sheet are circumferential or axial.

7. The roller bearing set according to claim 1 , wherein each of the primary external bushing and the secondary external bushing comprises a track defined by a semi-cylindrical track and a semi-toroid track.

8. The roller bearing set according to claim 7 , further comprising an axial tightener configured to tighten the primary external bushing and the secondary external bushing axially toward the chassis, with the axial stiffness of the axial tightener under an axial force applied by the secondary external bushing less than or equal to the stiffness of the primary external bushing and the secondary external bushing under the axial force.

9. The roller bearing set according to claim 7 , further comprising a damper positioned around the chassis, wherein the radial stiffness of the damper is lower than the radial stiffness of the primary angular contact bearing and the secondary angular contact bearing.

10. The roller bearing set according to claim 1 , wherein the primary external bushing is in contact with the secondary external bushing.

11. The roller bearing set according to claim 10 , wherein each of the primary external bushing and the secondary external bushing comprises a track defined by a semi-cylindrical track and a semi-toroid track.

12. The roller bearing set according to claim 10 , wherein the primary internal bushing is in contact with the secondary internal bushing.

13. The roller bearing set according to claim 12 , wherein each of the primary external bushing and the secondary external bushing comprises a track defined by a semi-cylindrical track and a semi-toroid track.

14. The roller bearing set according to claim 13 , further comprising an axial tightener configured to tighten the primary external bushing and the secondary external bushing axially toward the chassis, with the axial stiffness of the axial tightener under an axial force applied by the secondary external bushing less than or equal to the stiffness of the primary external bushing and the secondary external bushing under the axial force.

15. The roller bearing set according to claim 14 , further comprising a damper positioned around the chassis, wherein the radial stiffness of the damper is lower than the radial stiffness of the primary angular contact bearing and the secondary angular contact bearing.

16. The roller bearing set according to claim 1 , further comprising an axial tightener configured to tighten the primary external bushing and the secondary external bushing axially toward the chassis, with the axial stiffness of the axial tightener under an axial force applied by the secondary external bushing less than or equal to the stiffness of the primary external bushing and the secondary external bushing under the axial force.

17. The roller bearing set according to claim 16 , further comprising a damper positioned around the chassis, wherein the radial stiffness of the damper is lower than the radial stiffness of the primary angular contact bearing and the secondary angular contact bearing.

18. The roller bearing set according to claim 16 , wherein the axial tightener comprises a fastener and a circular plate, and the axial stiffness of the fastener is lower than the axial stiffness of the primary external bushing, the secondary external bushing, and the circular plate by a factor of 10 or above.

19. The roller bearing set according to claim 18 , further comprising a damper positioned around the chassis, wherein the radial stiffness of the damper is lower than the radial stiffness of the primary angular contact bearing and the secondary angular contact bearing.

20. An electric motor, comprising:
a rotor shaft;
a primary bearing comprising a magnetic bearing;
a rolling bearing set comprising:
a primary angular contact bearing with a primary external bushing, a primary internal bushing, and primary rolling elements;
a secondary angular contact bearing with a secondary external bushing, a secondary internal bushing, and secondary rolling elements; and
a chassis, wherein the primary angular contact bearing and the secondary angular contact bearing are mounted on the chassis,
wherein the primary external bushing and the secondary external bushing are positioned within the chassis, one immediately adjacent to the other; and
a secondary bearing supporting the rotor shaft when the primary bearing fails, wherein the rotor is mounted on the primary bearing making no contact with the secondary bearing.

Assignees

• Ge Energy Power Conversion Technology Ltd

Inventors

• Delepine Xavier
• Lacour Yves

Classifications

• F16C41/004

  Electro-dynamic machines, e.g. motors, generators, actuators · CPC title

• F16C19/542 Primary

  with two rolling bearings with angular contact · CPC title

• F16C32/0442

  with devices affected by abnormal, undesired or non-standard conditions such as shock-load, power outage, start-up or touchdown · CPC title

• F16C35/07

  Fixing them on the shaft or housing with interposition of an element · CPC title

• F16C35/077

  between housing and outer race ring · CPC title