Patent ID: 7229214
Filing Date: 2007-06-12
Classification: F16C

Abstract:
1. A fluid dynamic bearing unit comprising: a housing; a bearing member fixedly mounted in the housing; and a rotary shaft rotatably received in the bearing member with a radial space formed between the rotary shaft and the bearing member, the radial space filled with lubricant to establish dynamic pressure to separate the shaft and the bearing member in radial direction when the rotary shaft rotates; wherein the bearing member defines therein a ventilating path to communicate an interior with an exterior of the bearing member and the ventilating path is formed prior to attachment of the bearing member in the housing; wherein a bearing pattern is formed on either of the bearing member and the rotary shaft, and the bearing pattern comprises two groups of continuous Z-shaped grooves formed at upper and lower halves of the bearing pattern; and wherein the Z-shaped grooves form a plurality of outer communication ends at top and bottom edges of the bearing pattern.