摘要:
An epicyclic gearing arrangement includes a planet gear 84 rotatable on a planet bearing that is mounted via a support pin 96 to a carrier 90, 92, 94 of the epicyclic gearing arrangement. A spring film damper 101 is disposed between the outer surface of the bearing's outer ring and the opposing inner surface of the planet gear and includes an annular gap. The support pin and/or outer ring include oil feed holes that open into the respective annular gap(s).
摘要:
An epicyclic gearing arrangement includes a planet gear (842) rotatable on a planet bearing that is mounted via a support pin (96) to a carrier (90, 92, 94) of the epicyclic gearing arrangement. An attenuation spring is disposed between the outer surface (843) of the bearing's outer ring (841) and the opposing inner surface (844) of the planet gear (842) and includes an annular gap. A spring film damper is disposed between the cylindrical outer surface (105) of the support pin (96) and the opposing inner surface of the inner ring (102) of the planet bearing and includes an annular gap. The support pin (96) and/or outer ring (842) include oil feed holes (961, 82) that open into the respective annular gap(s). A gas turbine engine (10) includes an epicyclic gearing arrangement having such a planet bearing.
摘要:
A planet gearbox is provided for connection to a carrier of an epicyclic gearing arrangement with a single input and single output and including a sun gear 80, a ring gear 86 and at least one double helix planet gear rotatable on a cylindrical roller bearing with a cage 118 having a cross-web thickness of 15% to 25% of the diameter of the cylindrical rollers 104 and an L/D ratio exceeding 1.0. A gas turbine engine 10 includes a fan 38 and LP shaft 36, which couples a compressor 22 to a turbine 30. An epicyclic gearing arrangement has a single input from the LP shaft coupled to a sun gear 80, a single output coupled to the fan's shaft, and a planet bearing cage 118 having a cross-web thickness measuring 15% to 25% of the roller's diameter.
摘要:
A planet gear train 200 for an engine casing 226 includes a sun gear 204 rotatable by a shaft 202, a ring gear 208, a plurality of planet gears 206 rotatably mounted in a planet carrier 210 and meshing with the sun gear 204 and the ring gear 208, and a damping system. The damping system includes a soft mount 212 disposed about the shaft 202 and coupling the planet carrier 210 the engine casing 226. The soft mount 212 includes a flexible inner sleeve 214 and a flexible outer sleeve 216. The flexible inner sleeve 214 and the flexible outer sleeve 216 are fixedly coupled together at respective central portions thereof near the shaft 202. The damping system further includes a plurality of damping couplers 218 disposed about an outer flange 232 of the planet carrier 210. The plurality of damping couplers is configured to flexibly couple the flexible inner sleeve 214 to the flexible outer sleeve 216.
摘要:
A pitch control mechanism (100, 200, 300, 400, 500, 600) includes: a rotor structure configured for rotation about a longitudinal axis; a row of blades (28) carried by the rotor structure, each blade having an airfoil and a trunnion (120) mounted for pivoting movement relative to the rotor structure, about a trunnion axis which is perpendicular to the longitudinal axis; a unison ring (108, 208, 308, 408, 508, 608) interconnecting the blades (28); an actuator (106, 206, 306, 406, 506, 606) connected to the unison ring (108, 208, 308, 408, 508, 608) and the rotor structure, operable to move the unison ring (108, 208, 308, 408, 508, 608) relative to the rotor structure; at least one moveable counterweight (138, 238, 338, 438, 538, 638) carried by the rotor structure, remote from the blades (28); and an interconnection between the blades (28) and the counterweight, such that movement of the counterweight (138, 238, 338, 438, 538, 638) causes a change in the pitch angle of the blades (28).
摘要:
A gas turbine engine including a fan 38, a core 16 including at least one rotatable shaft, and a gearbox 100 mechanically coupling at least one rotatable shaft of the core to the fan is provided. The gas turbine engine also includes a coupling system 132 for mounting the gearbox within the gas turbine engine. The coupling system includes a flexible coupling 152 connected to at least one of a fan frame 144 or a core frame 134, as well as a torque frame connected to the flexible coupling and the gearbox. Moreover, a deflection limiter 174 is provided, loosely attaching the flexible coupling to the gearbox to provide a predetermined axial range of motion, radial range of motion, and circumferential range of motion between the gearbox and the frame to which the flexible coupling is attached.
摘要:
A gas turbine engine including a fan 38, a core 16 including at least one rotatable shaft, and a gearbox 100 mechanically coupling at least one rotatable shaft of the core to the fan is provided. The gas turbine engine also includes a coupling system 132 for mounting the gearbox within the gas turbine engine. The coupling system includes a flexible coupling 152 connected to at least one of a fan frame 144 or a core frame 134, as well as a torque frame connected to the flexible coupling and the gearbox. Moreover, a deflection limiter 174 is provided, loosely attaching the flexible coupling to the gearbox to provide a predetermined axial range of motion, radial range of motion, and circumferential range of motion between the gearbox and the frame to which the flexible coupling is attached.
摘要:
An epicyclic gearing arrangement includes a planet gear (84, 841, 842) rotatable on a planet bearing that is mounted via a support pin (96) to a carrier (90, 92, 94) of the epicyclic gearing arrangement. A spring film damper is disposed between the cylindrical outer surface (105) of the support pin (96) and the opposing inner surface of the inner ring (102) of the planet bearing and includes a radial gap. The support pin (96) includes oil feed holes 961 that open into the respective radial gap. A gas turbine engine (10) includes an epicyclic gearing arrangement having such a planet bearing.