| 摘要 |
The mechanism comprises a propeller shaft 12 mounted on a hub 10, the shaft being angularly adjustable relative to the hub to adjust the blade pitch but constrained against movement axially of the shaft by thrust bearings 18, 20, 22. An adjustment member or sleeve 28 is located between the shaft and hub and is constrained against angular movement relative to the hub but is capable of axial movement relative to the shaft to which it is attached by a coupling arrangement comprising a projection 32 with a roller on one of the shaft and sleeve 34 engaging in a slot 30 in the other. Axial movement of the adjustment member causes angular movement of the shaft. The adjustment member may be moved hydraulically 36 38, 40 or by centrifugal force against disc springs 44. Application in aircraft propellers or wind turbines. |
