Hydrodynamic bearing device, motor, recording and reproducing apparatus, and machining jig

摘要

A fluid bearing device 40 comprises a sleeve 1, a shaft 2, a thrust plate 4, a radial bearing component 21, and a thrust bearing component 22. A bearing hole 1 a is formed in the sleeve 1. The shaft 2 has a shaft main component 5 that is inserted in the bearing hole 1 a, and a flange 3 provided on the axial lower side of the shaft main component 5. The thrust plate 4 is fixed to the sleeve 1 and covers the shaft 2 from the axial lower side. A screw hole 5 a that is coaxial with the shaft main component 5 is formed in the shaft main component 5 from the end face on the axial upper side toward the axial lower side. An annular concave component 3 c that is coaxial with the shaft 2 is formed in the end face on the axial lower side of the shaft 2.