CPC E21B 43/128 (2013.01) [F04D 13/10 (2013.01); H02K 5/132 (2013.01); H02K 5/161 (2013.01)] | 13 Claims |
1. A submersible pump electrical motor, comprising:
a stator having a stator bore defining an inward facing stator sidewall with an axially extending groove, relative to a longitudinal axis of the motor;
a shaft extending through the bore along the axis;
first and second rotor sections mounted to the shaft for rotation therewith;
a bearing hub between the first and second rotor sections, the bearing hub having a hub outward facing sidewall and a hub inward facing hub sidewall;
a collar comprising,
a collar inward facing sidewall rigidly mounted to the hub outward facing sidewall,
a collar outward facing sidewall spaced from stator sidewall by an annular clearance,
first and second ends facing axially in opposite directions,
a recess extending a partial circumferential distance in the collar inward facing sidewall,
a slit that extends from the recess to the collar outward facing sidewall;
a curved access wall radially outward from the recess and extending from the first end toward the second end of the collar, the access wall beginning at the slit and extending a partial circumferential distance from the slit; and
a shelf extending from the access wall to the slit, the shelf being located between the first and second ends of the collar and facing in a direction toward the first end of the collar;
an anti-rotation spring having at least one supporting tang in abutment with the hub outward facing sidewall and a locking tang that extends adjacent to the supporting tang along a portion of a circumference of the hub, is biased radially outward by the supporting tang, and has an outer portion that extends through the slit into engagement with the groove, the locking tang having an edge, so that when the spring tends to move in a direction from the first end toward the second end of the collar, the edge abuts the shelf.
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