| 摘要 |
A thrust bearing device, particularly for taking up oscillating rotational movements, for example for use as a blade suspension bearing in an axial flow fan, in which two coaxial thrust bearings which are coupled in series with respect to their loading forces are individually restricted by means of a blocking device to be allowed to turn in one or the other direction of revolution only, so that each roller (3, 4) in each of the two bearings at each rotational movement will be displaced to local engagement against a new point of contact one each of the races (1, 10; 11, 2) in question. The blocking device is constructed to allow stepless relative rotational movement between mutually immovable races (10, 11) in each of the two bearings and one or the other of two relatively movable races (1, 2) belonging to each of the two bearings. The blocking device may be constituted by a spring coupling comprising two helical springs (13, 14), each of which is arranged for exerting spring action on race rings (5, 6, 12) belonging to the same bearing on the internal or the external sides thereof. |
