Bearing arrangement

Patent metadata

Field	Value
Publication number	US-2016258482-A1
Application number	US-201415030344-A
Country	US
Kind code	A1
Filing date	Oct 10, 2014
Priority date	Oct 17, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

The present invention relates to a bearing arrangement having a first and a second support structure for supporting a rotating member, a first rolling bearing supporting the first support structure in relation to the second support structure at a first support location, a second rolling bearing supporting the first support structure in relation to the second support structure at a second support location. The first and second rolling bearings are arranged in a coaxial configuration in relation to each other. Furthermore, the first rolling bearing forms a radially outer bearing, and the second rolling bearing is arranged radially inside the first rolling bearing by a bearing radial distance, and the first support location and second support location are axially aligned. The present invention also relates to a method for manufacturing a bearing arrangement.

First claim

1 . A bearing arrangement, comprising:
a first and a second support structure for supporting a rotating member, the rotating member having a main axis of rotation, wherein the first support structure is configured to rotate with the rotating member, and the second support structure is fixed and configured to be non-rotatably mounted to a frame, a first rolling bearing supporting the first support structure in relation to the second support structure at a first support location, a second rolling bearing supporting the first support structure in relation to the second support structure at a second support location, wherein the first and second rolling bearings are arranged in a coaxial configuration in relation to each other, wherein the first rolling bearing forms a radially outer bearing, and the second rolling bearing is arranged radially inside the first rolling bearing by a bearing radial distance (A), and wherein the first support location and the second support location are axially aligned.

2 . The bearing arrangement according to claim 1 , wherein the contact angle of at least one of the first and second rolling bearings is angled in relation to the main axis of rotation (R).

3 . The bearing arrangement according to claim 1 , wherein the contact angles of the first and second rolling bearings are angled in relation to the axis of rotation, wherein the first rolling bearing is configured to axially locate the first support structure in relation to the second support structure in a first axial direction (D 1 ), and the second rolling bearing is configured to axially locate the first support structure in relation to the second support structure in a second axial direction (D 2 ), the second axial direction being opposite the first axial direction.

4 . The bearing arrangement according to claim 2 , wherein the contact angle (ca 1 ca 2 ) of at least one or both of the first and second rolling bearings is between 5 and 90 degrees.

5 . The bearing arrangement according to claim 1 , wherein a first pressure center of the first rolling bearing and a second pressure center of the second rolling bearing are separated in the axial direction by a pressure center distance (B).

6 . The bearing arrangement according to claim 1 , wherein the first rolling bearing comprises a rotating ring with a raceway for a first set of rolling elements and a non-rotating ring with a raceway for the first set of rolling elements, and the second rolling bearing comprises a rotating ring with a raceway for a second set of rolling elements and a non-rotating ring with a raceway for the second set of rolling elements.

7 . The bearing arrangement according to claim 6 , wherein the rotating ring of the first rolling bearing and the rotating ring of the second rolling bearing are mounted to the first support structure, and the non-rotating ring of the first rolling bearing and the non-rotating ring of the second rolling bearing are mounted to the second support structure.

8 . The bearing arrangement according to claim 1 , wherein the first and second bearings are axially displaced in relation to each other by an axial bearing distance defined between axial centers of the first and second rolling bearings, wherein the axial bearing distance is one of
within a distance corresponding to the outer radius of the second rolling bearing, within a distance corresponding to the axial extension of the second rolling bearing, within a distance corresponding to 50% of the axial extension of the second rolling bearing, within a distance corresponding to 20% of the axial extension of the second rolling bearing.

9 . The bearing arrangement according to claim 1 , wherein the bearing radial distance (A) equals or exceeds a distance corresponding to the axial extension of the second rolling bearing,
equals or exceeds a distance corresponding to 50% of the outer radius of the second rolling bearing, equals or exceeds a distance corresponding to the outer radius of the second rolling bearing, equals or exceeds a distance corresponding to 150% of the outer radius of the second rolling bearing, equals or exceeds a distance corresponding to the outer diameter of the second rolling bearing, equals or exceeds a distance corresponding to 200% of the outer diameter of the second rolling bearing.

10 . The bearing arrangement according to claim 1 , wherein the first support structure is disc-shaped and provides a first bearing seat having a seating surface that is configured to retain the rotating ring of the first rolling bearing by abutment, and a second bearing seat with a seating surface that is configured to retain the rotating ring of the second rolling bearing by abutment, and wherein
the first and second bearing seats are axially aligned and radially separated in relation to each other.

11 . The bearing arrangement according to claim 1 , wherein at least one of the first and second rolling bearing is a tapered roller bearing, spherical roller thrust bearing, angular contact spherical roller bearing, toroidal roller bearing, angular contact toroidal roller bearing, a cylindrical roller bearing, angular contact ball bearing, ball bearing with groove, or a combination of these.

12 . An electric machine comprising: a bearing arrangement having a first and a second support structure for supporting a rotating member, the rotating member having a main axis of rotation (R), wherein the first support structure is configured to rotate with the rotating member, and the second support structure is fixed and configured to be non-rotatably mounted to a frame,
a first rolling bearing supporting the first support structure in relation to the second support structure at a first support location, a second rolling bearing supporting the first support structure in relation to the second support structure at a second support location, wherein the first and second rolling bearings are arranged in a coaxial configuration in relation to each other, wherein the first rolling bearing forms a radially outer bearing, and the second rolling bearing is arranged radially inside the first rolling bearing by a bearing radial distance (A), wherein the first support location and the second support location are axially aligned, and wherein the frame forms an electric machine housing, the first support structure forms parts of a rotor of the electric machine, and the electric machine further comprises a stator attached to the electric machine housing, that cooperates with the rotor during operation.

13 . (canceled)

14 . (canceled)

15 . A method for manufacturing a bearing arrangement having a main axis of rotation, the method comprising:
providing a first support structure for supporting a rotating member and arranging the first support structure to rotate with the rotating member, providing a second support structure for supporting the rotating member, and arranging the second support structure to be non-rotatably mounted to a frame, providing a first rolling bearing and arranging it to support the first support structure in relation to the second support structure at a first support location ( 101 ), and providing a second rolling bearing and arranging it to support the first support structure in relation to the second support structure at a second support location ( 201 ), arranging the first and second rolling bearings in a coaxial configuration in relation to each other, arranging the first rolling bearing as a radially outer bearing, providing the second rolling bearing radially inside the first rolling bearing by a bearing radial distance (A), and axially

Assignees

• Skf Ab

Inventors

• Kullin Arne Lars Jonas
• Wendeberg Hans

Classifications

• F16C19/547 Primary

  with two angular contact rolling bearings · CPC title

• F16C2360/31

  Wind motors · CPC title

• H02K5/173

  using bearings with rolling contact, e.g. ball bearings · CPC title

• F16C43/04

  Assembling rolling-contact bearings · CPC title

• F16C2300/02

  General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned · CPC title