ROTATING DEVICE

摘要

A rotating device includes: a rotating body supported in a freely rotatable manner relative to a stationary body; a retaining gap retaining a lubricant; a fluid dynamic pressure generating portion generating dynamic pressure to the fluid; a capillary seal in communication with a first end of the retaining gap, and extending toward an external side from the retaining gap; a cap including an annular cover portion that covers at least a part of an end of the capillary seal located at the external side from the retaining gap, and, a cylindrical portion that extends from an outer circumference of the cover portion in an axial direction; and an annular groove including an annular first wall that encircles the cylindrical portion, an annular second wall that is encircled by the cylindrical portion, and a bottom wall that faces an end of the cylindrical portion opposite to the cover portion.

主权项

1. A rotating device comprising:
a stationary body; a rotating body that is supported in a freely rotatable manner relative to the stationary body; a retaining gap that retains a lubricant between the stationary body and the rotating body; a fluid dynamic pressure generating portion that generates dynamic pressure to the fluid in the retaining gap; a capillary seal which is in communication with a first end of the retaining gap, and which extends toward an external side from the retaining gap; a cap provided on the stationary body, the cap comprising an annular cover portion that covers at least a part of an end of the capillary seal which is located at the external side from the retaining gap, and, a cylindrical portion that extends from an outer circumference of the cover portion in an axial direction which is in parallel with a rotation axis of the rotating body; and an annular groove provided in the rotating body, the annular groove comprising an annular first wall that encircles the cylindrical portion via a first gap, an annular second wall that is encircled by the cylindrical portion via a second gap, and a bottom wall that faces, via a third gap in the axial direction, an end of the cylindrical portion opposite to the cover portion.