What is O arrangement X arrangement?
O arrangement (BACK-TO-BACK)
With the ‘back to back’ bearing pair the inner rings are claimed together. The contact angle lines between the outer ring raceway, ball and inner raceway diverge. This results in a maximum spread giving high rigidity. This is the reason why this type of duplex bearing is most commonly used.
1）Less sensitive to the thermal gradient than face-to-face arrangement
2）Easy mounting on the shaft
3）Self contained assembly on the shaft
1）Higher sensitivity to misalignment than face-to-face
X Arrangement (FACE-TO-FACE)
With the ‘face to face’ bearing pair the outer rings are claimed together. The contact lines converge resulting in a smaller spread and more elastically.
1）Higher misalignment capabilities than back-to-back
2）Permits disassembly in screw compressors without destroying one of the bearing
1）No self-contained assembly on the shaft
2）More sensitive to thermal gradient than back-to-back