| 摘要 |
A variable angle turbine nozzle actuating mechanism in which a nozzle-actuating ring is mounted co-axially of the nozzle-defining members and is operatively connected thereto to effect their angular movement. The mechanism includes a pair of links pivotally connected to the nozzle-actuating member, a lever pivotally connected to the opposite end of each of the links and itself pivotally mounted on a support between the pivotal points thereon of the links, and a pivotally-mounted rocker arm drivingly engaged at its outer end with the lever. On turning the rocker arm, the lever will be swung about its pivot thereby simultaneously to push one link and to pull the other link to turn the nozzle-actuating member through a corresponding circumferential distance and hence to turn the nozzle-defining members through predetermined angles and to hold them in those angular positions. The lever is slidable on its support in the plane of the lever and the point of engagement of the rocker arm with the lever is also movable in the plane of the lever. On temperature change effecting expansion or contraction of one or both the links, the lever will slide with respect to the support and the rocker arm and expansion or contraction of the links will be accommodated without effecting any substantial movement of the nozzle-actuating member.
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