| 摘要 |
A variable vane assembly, for example of stator vanes in a gas turbine engine, comprises vanes which can be turned together about their longitudinal axes by means of a unison ring which is turned by an actuator about the engine axis. The unison ring is coupled to the vanes by levers. The unison ring has varying stiffness along its circumference, increasing in the direction away from the drive point at which the actuator acts. The varying stiffness may be achieved by varying the radial thickness of the unison ring. The unison ring is thus able to resist ovalization so that the vanes move together.
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