| 摘要 |
A pivoting power transmission unit is provided for transmitting rotational drive to a rotor configured to revolve about an axis of rotation and configured to be swivelled about a pivot axis substantially perpendicular to said rotation axis. The unit comprises a casing mounted between two parts of a support by two bearings co-axial with the pivot axis. Each bearing includes a stationary part attached to the support, swivelling part attached to the casing and a wear take-up ring disposed therebetween. The unit further comprises a device to take up axial play between the casing and the support. The device includes an annular piston, sliding axially in a chamber fed with fluid under pressure, and bearing against an axial end of the wear take-up ring.
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