| 摘要 |
An electric motor ( 10 ) has an armature structure ( 12 ) including a shaft ( 14 ), a lamination stack ( 11 ) coupled with the shaft, a commutator ( 16 ) coupled with the shaft, and windings ( 13 ) carried by the lamination stack and connected to the commutator. Brushes ( 17 ) engage the commutator to deliver electric current to the windings. The motor includes a frame structure ( 18 ) carrying permanent magnets ( 19 ), at least one sleeve bearing ( 20 ) operatively associated with an end of the shaft to support the shaft for rotation, and a unitary bearing retainer structure ( 22 ) coupled with the frame structure and holding the at least one sleeve bearing. The retainer structure is constructed and arranged 1) to prevent movement of the retainer structure in a direction towards the end of the shaft, 2) to provide a spring force against the frame structure to prevent the retainer structure from moving in a direction away from the end of the shaft, and 3) to control endplay of the armature structure by controlling engagement of the retainer structure with the frame structure.
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