| 摘要 |
Recording disk drive having a brushless drive motor, which has a stator provided with a winding and an outer rotor coaxially embracing the stator while at the same time forming a substantially cylindrical air gap, as well as having a hub which is connected in a rotationally fixed manner to the outer rotor and is provided with a disk carrier section which, for the purposes of recording at least one store disk arranged in a clean space, can be inserted through a central opening of the store disk, in which arrangement the stator winding and the outer rotor interacting therewith are accommodated, at least over half of their axial lengthwise dimension, inside the space enclosed by the disk carrier section of the hub, the outer rotor and the hub are rotatably mounted by means of a bearing arrangement (7, 17) coaxially about the inner stator by means of a shaft and in which arrangement a ring part (5, 35) is fitted concentrically with high precision between the inner circumference of a drive part (1, 11, 21; 32, 42, 52) and an outer race of a first bearing (7), belonging to the bearing arrangement (7, 17), the drive part (1, 11, 21; 32, 42, 52), which is supported at its one axial end region on an outer race of a second bearing (17), and the ring part (5; 35) as well as the shaft (16; 46) consisting of material having substantially the same thermal expansion. <IMAGE> |
