Low-torque nuts for stator core through-bolts

Details Low-torque nuts for stator core through-bolts Low-torque nuts for stator core through-bolts

1987-11-16

1989-03-07

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

29596, 411393, 411432, 310 42, 310 91, H02K 504, F16B 3500, F16D 106

Patent

active

048109193

ABSTRACT:
A method and apparatus for compressing a stator core assembly of an electric generator having a plurality of stacked punchings positioned between opposing compression plates. A through-bolt is passed through an aperture drilled through the stacked punchings, and a tensioning nut threaded onto one end of the through-bolt. A thrust nut is threaded onto a second end of the through-bolt, thereby compressing the punchings between the tensioning nut and a thrust nut. The tensioning nut is fixed to the through-bolt so as not to be removable. The punchings are compressed by external means and then the thrust nut is tightened against the plate and peened to remain in position. Final tensioning and retensioning is provided by a plurality of set screws circumferentially placed about the thrust nut and extending parallel to the through-bolt. The set screws may be turned, cooperating against one of the compression plates to exert compressive force on the punchings. The set screws may utilize nylon inserts to prevent loosening. The utilization of the unique thrust nut with set screws allows the punchings to be retensioned after installation without requiring utilization of large tools to turn the very large thrust nut.

REFERENCES:
patent: 3618994 (1971-11-01), Gepfert
patent: 4622730 (1986-11-01), Steinbock
patent: 4660687 (1987-04-01), Williams et al.
Machine Design, 11/13/86, "Threaded Fasteners"--Page 76 (vol. 58, No. 27).

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