| 摘要 |
PURPOSE: To provide an inexpensive dynamic pressure bearing by forming respective faces between one parts of rotors and radial bearings opposed thereto and respective faces between them and the top thrust bearing opposed thereto from sliding faces and providing a dynamic pressure generation groove in one of the bottom thrust bearings opposed to the rotors. CONSTITUTION: A dynamic pressure bearing 11 is provided with a radial bearing 4, thrust bearings 2, 3 provided on both bottom and top ends, and rotors 5 rotatably provided to both bearings, and respective faces between one parts of the rotors 5 and the radial bearings opposed thereto and respective faces between the top thrust bearings are formed with sliding faces. The radial bearing face without receiving any dead load of the rotors 5 and magnetic force of a magnet, and the top thrust bearing face are made to improve roundness and surface roughness by high precision machining so as to form air clearance and only the bottom thrust bearing face receiving forces such as dead load of the rotors, etc., is provided with a dynamic pressure generation groove 22 required for highly advanced machining technology. |
