LOCK MEMBER OF LARGE ELECTRIC MACHINE STATOR Russian patent published in 2014 - IPC H02K1/18 F16B39/02 

FIELD: machine building.

SUBSTANCE: lock member preventing fastening nuts from self-unscrewing at the deformation and vibration of a core is installed at the threaded ends of longitudinal keybars of the core behind the end plates under the fastening nuts. The element comprises a thin-walled ring with the outer diameter being greater than the fastening nut diameter, its protruding part is folded onto the edge of the fastening nut. The ring body is fitted by a local protrusion and a locking "socket" in the end plate under the fastening nut with the protrusion being set in the "socket". The ring is mounted behind the fastening nut, is increased by its thickness at least up to the half of the fastening nut thickness. The ring is also fitted by a local protrusion at the end face on the side of the hole eccentricity and on the side turned to the fastening nut. The area of the protrusion amounts to 1/4 of the area of the cut-off ring on the side turned to the fastening nut by oval grooves with designed depth outside along the side surface symmetrically to the slot. The ring is also fitted by two passage holes and a clamping bolt with a nut and a lock washer.

EFFECT: improved clamping of keybar thread without increase of a lock member size, its improved reliability and fabricability.

4 cl, 6 dwg