Patent ID: 6734591
Filing Date: 2004-05-11
Classification: F16C,G11B,H02K

Abstract:
A spindle motor comprisinga double row bearing device including a shaft, a sleeve surrounding the shaft, and a pair of upper and lower rows of balls, a sylindrical bearing holder extending upwardly from a base of the spindle motor for accommodating the sleeve within a vertical bore of the holder, and a rotor hub mounted on the shaft for journaling the rotor hub rotatably on the base, the spindle motor is characterized in that an outer peripheral groove formed on the sleeve, and a squeezing ring having an inner diameter smaller than the outer diameter of the outer peripheral groove, wherein the squeezing ring is fit over the outer peripheral groove to elastically deform the sleeve inwardly to form a squeezed portion protruding inwardly between the upper and lower row of balls.