| 摘要 |
<p>A variable area fan nozzles (14) comprising an array of rigid petals (18) hinged to a lip area at the downstream end of a thrust reverser sleeve (or half-sleeve). In one embodiment, the actuation system comprises a rotatable ring segment (28), a drive system (30) for rotating the ring segment, a plurality of cams (36) attached or integrally formed with the ring segment (28), a plurality of cam followers (42, 44), and a plurality of petal linkages (80) which operatively couple the petals (18) to the cam followers (42, 44). This actuation system controls the deflection of the petals (18), thereby controlling the amount of opening and the rate at which the fan nozzle throat area changes. Each cam (36) may have forward- and rearward-facing camming surfaces (48, 46) that interact with the cam followers (42, 44) to force the petals to pivot outward or inward respectively.
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