Patent ID: 6118620
Filing Date: 2000-09-12
Classification: F16C,G11B,H02K

Abstract:
A spindle motor for use in a magnetic data storage system including a shaft having a central section and two independent fluid dynamic bearings on opposite sides of said central section,each of said bearings comprising a bearing cone fixed to the shaft and tapering inwardly towards said central section, and a bearing seat rotating around the shafts each of the bearing seats having a fluid bearing surface which is complementary to a surface of said bearing cone to thereby establish a first section of a fluid dynamic bearing,each of said fluid dynamic bearings further comprising a second gap section defined between an inner surface of said bearing cone and a surface of said shaft, and a third portion of a gap defined between a radially extending surface of said bearing cone and a complementary surface rotating with said bearing seat, so that a continuous gap is formed around each of said bearing cones, andfluid in said continuous gap separating said complementary surfaces of said bearing seat and said bearing cone to allow free rotation of said bearing seat relative to said shaft and said bearing cone and a centrifugal capillary seal on one side of each said bearing cone and a grooved pumping seal on the opposite side of each said bearing cone to isolate and contain said fluid within said independent fluid dynamic bearings.