Motor with a stepped shaft and a bearing inner race fixed to a knurled portion of the shaft by an adhesive

摘要

In a motor having a spindle (5) on which an inner race (8) of a ball bearing is mounted, an outer peripheral surface of an end of the spindle (5) is formed into a knurled portion (16) on which is mounted the inner race (8) which is fixed to the spindle (5) through an adhesive (18) filling a clearance between an inner surface of the inner race (8) and the knurled portion (16). An annular groove (19), formed in the spindle (5) in an area adjacent to the knurled portion (16), is also filled with the adhesive (18) to further fix the inner race (8) to the spindle (5), which improves the adhesive bond between the inner race (8) and the spindle (5). Even where the ball bearing is a miniature one having a thin-wall inner race (8), there is no risk of deformation of the inner race (8) when the adhesive (18) is cured, and so the rotational accuracy of the motor is improved. IMAGE