# US 2016/0258482 A1 · Bearing arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0258482 A1 - Document ID: US20160258482A1 - Status: Published application - Kind: A1 - Application number: 15/030,344 - Filed: 2014-10-10 - Published: 2016-09-08 - Earliest claimed: 2013-10-17 - Assignees: Aktiebolaget Skf - Applicants: Aktiebolaget Skf - Inventors: Arne Lars Jonas Kullin; Hans Wendeberg - Web page: https://patentgrep.com/patent/US20160258482A1 ## CPC - F16C 19/547: {with two angular contact rolling bearings} - F03D 80/70: Bearing or lubricating arrangements - F16C 19/548: {in O-arrangement} - F16C 23/086: {forming a track for rolling elements} - F16C 35/06: Mounting {or dismounting} of ball or roller bearings; Fixing them onto shaft or in housing - F16C 35/073: between shaft and inner race ring - F16C 43/04: Assembling rolling-contact bearings - H02K 5/173: using bearings with rolling contact, e.g. ball bearings - F05B 2240/50: Bearings - F16C 2300/02: General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned - F16C 2360/31: Wind motors - F16C 2380/26: Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F03D: WIND MOTORS - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## 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. ## Claims ### 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. ### Claim 2 (depends on 1) 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). ### Claim 3 (depends on 1) 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 (D1), 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 (D2), the second axial direction being opposite the first axial direction. ### Claim 4 (depends on 2) The bearing arrangement according to claim 2, wherein the contact angle (ca1 ca2) of at least one or both of the first and second rolling bearings is between 5 and 90 degrees. ### Claim 5 (depends on 1) 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). ### Claim 6 (depends on 1) 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. ### Claim 7 (depends on 6) 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. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 1) 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. ### Claim 10 (depends on 1) 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. ### Claim 11 (depends on 1) 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. ### Claim 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. ### Claim 13 (canceled) ### Claim 14 (canceled) ### Claim 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 aligning the first support location and second support location in relation to each other.