초록 ▼

An actuation system is provided for transferring axial motion into an interior of a gas turbine engine at a number of locations around an outer casing of the engine, with one synchronous movement. An external hydraulic actuator activates the system by rotating one outer crank which, in turn, rotates

An actuation system is provided for transferring axial motion into an interior of a gas turbine engine at a number of locations around an outer casing of the engine, with one synchronous movement. An external hydraulic actuator activates the system by rotating one outer crank which, in turn, rotates a single outer yoke. The yoke is mechanically linked to a plurality of crankshafts that extend through the outer casing of the engine and transmit rotational movement into the engine interior. The crankshafts are linked inside the engine to an annular sliding member causing that member to move axially. In one embodiment of this invention, the actuation system is used to open and close a slide valve between inner and outer bypass ducts of a variable cycle aircraft engine.

대표청구항 ▼

An actuation system for axially actuating an annular translating member internally mounted within a cylindrical outer casing of a gas turbine engine through which airflow passes, wherein said actuation system comprises: a plurality of circumferentially spaced crankshafts extending through said casin

An actuation system for axially actuating an annular translating member internally mounted within a cylindrical outer casing of a gas turbine engine through which airflow passes, wherein said actuation system comprises: a plurality of circumferentially spaced crankshafts extending through said casing for transmitting rotational movement; actuating means for partially rotating at least one of said crankshafts; means for inducing synchronous partial rotation of the plurality of crankshafts upon partial rotation of said one of said crankshafts, said means comprising: (a) an arcuate synchronizing yoke extending around at least a portion of the outer circumference of said casing and having a rectangular, hollow, cross section; (b) a plurality of first crank arms each having an end thereof fixedly attached to respective ones of said crankshafts for rotation therewith; (c) a plurality of link arms each having one end pivotally attached to an opposite end of a respective one of said first crank arms, and an opposite end pivotally attached to said arcuate synchronizing yoke, said link arms being aligned substantially tangentially with said yoke; (d) yoke mounting means comprising a plurality of pairs of concentric arcuate guide tracks fixedly mounted on opposite axial sides of said yoke; and a plurality of cooperating rollers each positioned between a pair of said guide tracks and each rotatably connected to a bracket fixedly mounted on said casing; and means connecting each of said crankshafts to said translating member for causing translation of said member upon rotation of said crankshafts.