Pivotal structure for a motor rotor

摘要

A pivotal structure for a motor rotor includes a housing with a stub thereon for engaging with a metal axle tube. The stub includes an inner ledge on which the metal axle tube rests. An expander has a stem inserted into an end of the metal axle tube. The stem has a diameter greater than or equal to an inner diameter of the metal axle tube, such that the metal axle tube is expanded in the radial direction and thus firmly secured with and positioned at the inner periphery of the stub. The metal axle tube includes a bearing mounted therein for pivotally holding a central shaft of a rotor. An outer periphery of the metal axle tube is engaged with a stator bobbin.