DYNAMIC PRESSURE BEARING, SPINDLE MOTOR AND ROTOR DEVICE WITH THE BEARING

摘要

PROBLEM TO BE SOLVED: To prevent dispersion and flowage of a lubricant mist in a dynamic hydraulic pressure bearing so as to prevent damage of a spindle motor using the dynamic hydraulic pressure bearing. SOLUTION: This dynamic hydraulic pressure bearing comprises a tube-like member 30, a shaft like member 20 rotatably provided to the tube-like member 30, a blockade member 50 fixed to the shaft-like member 20, and a lubricating oil filled in a gap between the tube-like member 30 and the shaft-like member 20. In this dynamic hydraulic pressure bearing, a dynamic air pressure generation groove 12 for gathering a lubricant mist toward a rotation center is formed on a lower face of the blockade member 50.