| 摘要 |
PURPOSE:To turn a revolutional shaft smoothly at a high speed and reduce power los or the like by bearing the revolutional shaft by means of an angular contact rolling bearing in both the radial and axial directions and additionally bearing the shaft by means of a magnetic bearing in the counter-axial direction. CONSTITUTION:Inside a case 1 a driving shaft 2 is disposed at the rear part thereof and supported by a ball bearing 3, A pulley 4 which is attached around the middle part of the driving shaft 2 is inserted in a window 5 formed on the peripheral wall of the case 1. The driving shaft 2 may be ready to be turned by winding a belt 6 on the pulley 4 exposed from the window 5. Inside the case 1 a revolutional shaft 7 is also disposed at the front part thereof in such a way that the front end of the shaft 7 passes through the end plate 8 disposed at the head of the case 1 and the middle part thereof is supported by an angular ball bearing 9 which is engaged inside the case 1. Permanent magnets 28 and 29 are embedded in the rear end face of the revolutional shaft 7 and the front end face of the driving shaft 2, respectively, whereby bearing the revolutional shaft 7 in the backward axial direction and applying a forward axial preload on said ball bearing 9. |
