LIQUID DYNAMIC PRESSURE BEARING AND SPINDLE MOTOR

摘要

PROBLEM TO BE SOLVED: To reduce mutual interference of an axial dynamic pressure part and a radial dynamic pressure part on a ring liquid dynamic pressure bearing. SOLUTION: Negative pressure is not generated in a boundary region of both dynamic pressure bearing parts by providing ring spaces 8, 9 to reserve lubricating oil for generation of dynamic pressure along a neighbouring part of a radial dynamic pressure bearing part and an axial dynamic pressure bearing part formed between a ring 3 and a bearing part 5 and making the ring spaces 8, 9 keep atmospheric pressure through a passage formed on the bearing part 5 in a ring liquid dynamic pressure bearing 1 constituted as a shaft part 4 constituted with the ring 3 fixed on an end part 2A of a shaft body 2 is supported by the bearing part 5.