| 摘要 |
820,771. Jet propulsion plant. UNITED AIRCRAFT CORPORATION. Nov. 12, 1957 [Nov. 21, 1956], No. 35205/57. Class 110 (3). [Also in Group XXXIII] Jet propulsion engine thrust reversal mechanism comprises two sets of rotatable units pivotally mounted on the exhaust duct, and means to rotate the units between a retracted position in which they form a smooth fairing outboard of the duct, and a thrust reversal position in which the units form two abutting substantially semicircular passages downstream of the duct, to divide the exhaust gas into two streams each deflected in two substantially equal stages and discharged in a direction to give a reversed thrust. Fig. 2 shows in plan a gas turbine engine 10 discharging through a nozzle 20. A member 50, which in the retracted position shown in full lines has a semicircular cross-section perpendicular to the nozzle axis, is pivoted at two nearly diametrically opposite pivots 52 to brackets 126 on beams 68, the upper pivot, bracket and beam being shown. Each beam is secured to an engine supporting ring 104, an engine flange 114, and an I-section ring 116 surrounding but not attached to the nozzle 20. A member 48, also of semicircular section is pivoted to member 50 at two pivots 54 (the upper one shown), and has pivots 58 connected to the piston rods 62 of jacks 64 universally mounted to the engine at 80, and connected to tie rods 60 pivoted at 90 to brackets 66 on beams 68, the upper pivot 58, jack 64, rod 60 and bracket 66 being shown, those on the underside of the engine being similar. The other side of the engine is similarly provided with members 501, 48<1>, jacks 64<1>, and tie rods 60<1>. Meshing gears 76, 76<1> on pivots 52, 52<1> ensure equal operation of members 50, 50<1>. The jacks 64, 64<1> are operated by fluid pressure control of conduits 86, 88. Extension of the jacks rotates members 50, 50<1> to abut on surfaces 92, Fig. 3, and imparts a compound motion to members 48, 48<1>. These members have reinforcing brackets 98, 98<1>, and members 50, 50<1> have reinforcing brackets 100, 100<1> which in the thrust reversal position of Fig. 3 abut members 48, 48<1> at surfaces 94, 941 to provide a seal. In the thrust reversal position, the angle that members 50 and 50<1> make with the engine axis equals that between members 50 and 48 or 501 and 48<1>, and the exhaust gases are deflected through a total angle of 135 degrees. Spring-loaded locking latches 46, Fig. 2, engage members 48, 48<1> so that a pilot desiring thrust reversal must release the latches, which are fluid-pressure operated, before commencing movement of jacks 64, 64<1>. On retracting members 48, 48<1> to the normal position, the latches automatically re-engage. |
