DYNAMIC PRESSURE BEARING DEVICE

摘要

The axial dimension of a seal space can be reduced. A seal member (9) is fixed to a specified position on an outer peripheral surface (2a1) of a shaft section (2a). While a shaft member (2) rotates, a lower end surface (9b) of the seal member (9) is opposite an upper end surface (8b) of a bearing sleeve (8) with a specified thrust bearing clearance in between to form a second thrust bearing clearance (T2). Further, an outer peripheral surface (9a) of the seal member (9) forms a seal space (S) between itself and an upper end section inner peripheral surface (7a1) of a housing (7), and the seal space (S) has a specified volume.