Patent ID: 6133660
Filing Date: 2000-10-17
Classification: F16C,H02K

Abstract:
A brushless DC motor having a rotor with a field magnet and a rotatively supported shaft, and a stator with stator magnetic poles having salient poles in opposition to the rotor field magnet, comprising:a rotating portion which rotates with said rotor;a bearing, connected to a housing, said bearing including a surface which contacts the shaft to rotatively support the rotor;a spiral groove formed on the bearing extending continuously in an axial direction of the bearing with a constant angle of inclination;lubricating oil filling said groove;a plastic plate on an end of said rotating shaft to receive a force in a thrust direction of said rotating shaft; anda tapered insertion opening provided on said housing, a contacting section of said plate being formed as an inverse trapezoid to be received by said insertion opening.