THRUST DYNAMIC PRESSURE BEARING

摘要

PROBLEM TO BE SOLVED: To provide a thrust dynamic pressure bearing quickly floating a thrust plate in starting the rotation and having small rotation resistance of lubricating fluid. SOLUTION: The thrust plate 2 is formed with a dynamic pressure generating groove 6a in its upper face 2a as a first dynamic pressure generating means 6 and a dynamic pressure generating groove 7a in its lower face 2b as a second dynamic pressure generating means 7. The depth h1 of the dynamic pressure generating groove 6a is set deeper than the depth h2 of the dynamic pressure generating groove 7b so that the dynamic pressure generated by the second dynamic pressure generating means 7 is set larger than that generated by the first dynamic pressure generating means 6.