Fluid dynamic bearing system, has positioning unit for axial positioning of shaft and including regions with closer and broader bearing gaps and pump structures arranged on bearing surfaces in transient area between bearing gaps

摘要

The system has a bearing sleeve (3) with inner and outer bearing surfaces and a shaft (2) rotatably inserted into the bearing sleeve around a rotation axis. A bearing gap (5) filled with a bearing fluid is provided between the bearing surfaces. A radial bearing arrangement includes surface structures (6) on parts of the bearing surfaces, and positioning units for axial positioning of the shaft. The positioning unit includes regions with narrow and broader bearing gaps and pump structures arranged on the bearing surfaces in a transient area between the narrow and broader bearing gaps.