| Patent application number | Description | Published |
|---|
| 20080260310 | Fluid dynamic bearing system - The invention relates to a fluid dynamic bearing system that comprises at least one stationary part that has a shaft and two bearing plates disposed on the shaft at a mutual spacing, and at least one rotating part that is supported so as to rotate about a rotational axis with respect to the stationary part, and comprises a bearing bush and a sleeve enclosing the bearing bush. A bearing gap filled with bearing fluid is provided between the parts and at least one sealing gap for sealing the bearing gap that extends concentric to the rotational axis. The bearing comprises at least one fluid dynamic radial bearing and two fluid dynamic axial bearings and at least one recirculation channel that connects the two axial bearing regions to each other. According to the invention, the largest radial diameter of the recirculation channel is greater than or equal to the largest diameter of the sealing gap, and the smallest radial diameter of the recirculation channel is greater than or equal to the largest diameter of an adjacent bearing plate. Moreover, additional and effective deairing of the recirculation channel is effected by a venting device. To realize improved equilibrium of pressure in the bearing gap and improved retention of the bearing fluid, the sealing gaps can be inclined, at least in sections, at an angle α, β with respect to the rotational axis, wherein the angles may have different sizes. | 10-23-2008 |
| 20080267544 | Fluid dynamic bearing system - The invention relates to a fluid dynamic bearing system that has a first bearing part and a second bearing part that is rotatable with respect to the first bearing part, both of which form a bearing gap filled with a bearing fluid between opposing bearing surfaces. The bearing gap has two open ends that are each sealed against the environment by means of sealing zones. Bearing patterns used to generate hydrodynamic pressure within the bearing gap are provided on at least two spatially separated bearing surfaces. According to the invention, the bearing system is designed as a segment step bearing suited for changed directions of rotation, the ends of the sealing zones open to the environment being disposed on a smaller radial diameter than the bearing gap. The bearing fluid is thus kept in the bearing gap by means of a centrifugal force since on rotation of the bearing, the bearing fluid is pressed towards the outside and not towards the openings in the bearing gap or the sealing zones respectively. | 10-30-2008 |
| 20090074336 | Fluid dynamic bearing pattern and fluid dynamic bearing - The invention relates to a fluid dynamic bearing pattern that is disposed on at least one bearing surface of the two bearing parts of a fluid dynamic bearing that are moveable with respect to each other along a direction of movement. The bearing pattern comprises two related grooved sections, each section extending at an acute angle with respect to the direction of movement and exerting a defined pumping effect on the bearing fluid found in the bearing when the bearing parts move with respect to each other. According to the invention, the first section is disposed at an angle α and the second section at an angle β with respect to the direction of movement, the two angles varying in size. | 03-19-2009 |
| 20100124387 | Fluid dynamic bearing system - The fluid dynamic bearing system has at least one stationary part, and at least one rotating part that is supported rotatable about a rotational axis with respect to the stationary part. A bearing gap filled with bearing fluid is formed between mutually opposing surfaces of the stationary and of the rotating part. The bearing system comprises at least one fluid dynamic radial bearing and at least one fluid dynamic axial bearing that are disposed along sections of the bearing gap. Moreover, sealing means for sealing the open ends of the bearing gap are provided. According to the invention, one of the sealing means comprises an annular sealing gap that has one end connected to the bearing gap and one end connected to an annular reservoir, the outside radius of the reservoir measured from the rotational axis being larger than the outside radius of the sealing gap. | 05-20-2010 |
