| 摘要 |
1457790 Jet propulsion nozzles SOC NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION 21 Aug 1974 [21 Sept 1973] 36732/74 Addition to 1233694 Heading F1J A variable area jet propulsion nozzle having a series of flaps 102 pivoted about axes A tangential to a fixed duct 110 under the control of jacks 104 includes a synchronizing linkage to ensure that all flaps move in unison without formation of undesirable couples. Each flap 102 is supported about axis A on one of a series of beams 112 each having a stem 112c and two arms 112a, b, the latter being attached to duct 110 by cross-member M and pivot pin N. Each flap 102 carries a bifurcated lever 102y which is pivotally connected at C 1 , C 2 respectively to links 106, 107 lying in the central plane P through the flap. Links 106, 107 are also respectively connected at D 1 , D2 to levers 105 1 , 105 2 themselves pivoted at B 1 , B 2 to the stem 112c of beam 112. The levers 105 1 , 105 2 respectively extend circumferentially on opposite sides of beam 112 and are pivotally connected to the stem 112c and links 106, 107 associated with the circumferentially adjacent flaps 102. Each link 107 has a lug 107a pivotally connected to the rod 103 of jack 104 for controlling the associated flap 102. The assembly of levers and links forms a closed kinematic chain around the nozzle, operative to ensure synchronized movement of the controlled flaps 102 and intermediate follower flaps 122. The size of the levers and links may vary from one point to another around the circumference of the nozzle.
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