| 摘要 |
Disclosed is a hydrodynamic bearing assembly including a sleeve including a shaft hole and a shaft inserted into the shaft hole to rotate and including a bearing gap filled with a lubricant fluid and the sleeve, including top and bottom radial dynamic grooves having a herringbone shape to pump the lubricant fluid in the bearing gap in at least one of an inner surface of the sleeve and an outer surface of the shaft, and satisfying a condition that is a+b > c+d, b-a > c-d > 0 when a is defined as a shaft direction length from an top end of the top radial dynamic groove to a maximum pressure generating part, b is defined as a shaft direction length from an bottom end of the top radial dynamic groove to the maximum pressure generating part, c is defined as a shaft direction length from a top end of the bottom radial dynamic groove to the maximum pressure generating part, and d is defined as a shaft direction length from a bottom end of the bottom radial dynamic groove to the maximum pressure generating part. |
