| 摘要 |
The free nave arrangement has two lock rings (10,28) with internally formed axial tracks (13,29) with V-shaped cross-section. The track walls of the one lock ring (10) form first and second wedge surfaces (13a,13b). The one track wall of the other lock ring (28) forms a third wedge surface (29a). A roller holder (14) with rollers (15) located in the lock rings extends into the lock ring tracks. A nave (45) is rotatably arranged in the roller holder and has a cover surface (47), which works in conjunction with the rollers. The lock rings and the roller holder are limitedly rotatable relatively to one another and can adopt three different adjustment positions in relation to each other, in which the wedge surfaces in different combinations press the rollers into engagement with the nave cover surface, preventing rotation of the nave in one or the other direction or in both directions. In a fourth adjustment position, the nave can rotate freely in both directions. |
