Patent ID: 6246140
Filing Date: 2001-06-12
Classification: H02K

Abstract:
A pivotal structure for a rotor of a motor, comprising:a housing including a stub having a through-hole with a ledge formed on an inner periphery defining the through-hole;a stator bobbin including pole plates and a coil and a central hole;a metal axle tube having a bearing mounted to an inner periphery thereof, the metal axle tube having an outer periphery engaged with the stator bobbin and the stub, the metal axle tube having an outer diameter equal to or slightly greater than an inner diameter of the through-hole of the stub, the metal axle tube being engaged to the inner periphery of the through-hole of the stub with an end of the metal axle tube resting on the ledge;a rotor including a central shaft pivotally held by the bearing in the axle tube; andan expander including an enlarged head and a stem projected from a side of the enlarged head, the stem having a diameter greater than or equal to an inner diameter of the metal axle tube, the stem being extended through the ledge and force-fitted into the inner periphery of the metal axle tube for expanding the metal axle tube in a radial direction, thereby tightly secure the metal axle tube with the inner periphery of the through-hole of the stub.