Dual locking of rotating shaft assembly

A locking arrangement (20) arranged to be mounted onto a rotating shaft (4), the locking arrangement (20) comprising:

• a primary lock washer (7) comprising a plurality of foldable primary lock washer tabs (7a), the primary lock washer (7) being arranged to be mounted innermost on the rotating shaft (4), wherein the primary lock washer (7) comprises a lock washer connector (7b) arranged to fit in a shaft connector (6) of the rotating shaft (4),
• a shaft nut (8) comprising a plurality of shaft nut tab grooves (8a) arranged to engage with a folded primary lock washer tab (7a) arranged to be mounted outside of the primary lock washer (7) onto the rotating shaft (4), wherein when the one or more primary lock washer tabs (7a) are folded down into the shaft nut tab grooves (8a), the primary lock washer (7) and the shaft nut (8) are mechanically connected to the shaft (4), wherein the shaft nut (8) further comprises at least two shaft nut mounting threads (8b), and
• a secondary lock ring (9) arranged to be mounted outermost on the rotating shaft (4), wherein the secondary lock ring (9) comprises a plurality of secondary lock ring mounting holes (9a) and a secondary lock ring connector (9b) arranged to fit in the shaft connector (6) of the rotating shaft (4), such that at least two secondary lock ring mounting holes (9a) always align with the at least two shaft nut mounting threads (8b) such that at least two attachment screws (10) can be mounted through both the secondary lock ring (9) and the shaft nut (8).

Method for mounting a locking arrangement (20) onto a rotating shaft (4), wherein the locking arrangement (20) comprises a primary lock washer 7 comprising a plurality of foldable primary lock washer tabs (7a), and a lock washer connector (7b) arranged to fit in a shaft connector (6) of the rotating shaft (4)a shaft nut (8) comprising a plurality of shaft nut tab grooves (8a) and at least two shaft nut mounting threads (8b) and a secondary lock ring (9) comprising a plurality of secondary lock ring mounting holes (9a), wherein the method comprises:

• arranging a rotating shaft (4) with one end of the rotating shaft (4) arranged in a bearing interface,
• attaching the primary lock washer (7) to the rotating shaft (4) by aligning a primary lock washer connector (7b) with a shaft connector (6) arranged on the end of the rotating shaft (4),
• attaching a shaft nut (8) to the rotating shaft (4) and tightening the shaft nut (8) to applicable shaft nut mounting torque,
• folding down at least one primary lock washer tab (7a) into a shaft nut tab groove (8a), thereby mechanically connecting the primary lock washer (7) and the shaft nut (8) to the shaft (4),
• attaching the secondary lock ring (9) to the rotating shaft (4) by aligning a secondary lock ring connector (9b) with a shaft connector (6), thereby aligning at least two secondary lock ring mounting holes (9a) with the at least two shaft nut mounting threads (8b),
• mounting at least two attachment screws (10) through the secondary lock ring mounting holes (9a) and shaft nut mounting threads (8b), and
• tightening the at least two attachment screws (10) to an attachment screw mounting torque.