| 摘要 |
1278570 Toothed gearing GENERAL MOTORS CORP 8 Oct 1970 [13 Oct 1969] 47894/70 Heading F2Q [Also in Division F1] The invention relates to a gas turbine ducted fan engine in which the fan is driven from a turbine-compressor shaft of the engine through reduction gearing which includes two gear sets having equal speed counter-rotating output gears. A plurality of radial shafts extend across the gas flow duct, pinion gears on each radial shaft engaging with both output gears, a further pinion at the radially outer end of each shaft engaging with a ring gear mounted externally of the gas flow duct rotating with and driving the fan. The engine shown comprises LP compressor 12, HP compressor 20, combustion equipment 29, HP turbine 23 and LP turbine 15, the HP turbine driving the HP compressor through shaft 22, and the LP turbine driving the LP compressor through shaft 14, the LP turbine also driving the ducted fan 34, 35 through reduction gearing 18 disposed between LP and HP compressors. Two gears 52, 55 are splined to the LP shaft 14, the gear 52 engaging intermediate gears 68 which are rotatably mounted on stub shafts 71 of a fixed member 72; the intermediate gears 68 engage an internal ring gear 67 on a wheel 76, the wheel also having bevel gear 87 with which engage bevel pinions 83 mounted on the radially inner ends of radial shafts 82 which extend across air flow duct of the engine between the LP and HP compressors 12, 20. The shafts 82 are supported in fixed structure by means of bearings 88, 92, the shafts carrying at their radially outer ends gear pinions 84, the pinions engaging a face ring gear 48 which is rotatably mounted in bearing 46 and is secured by spline connection 50 to the hub 34. The fan blades 35 are supported on the hub 34. The second gear 55 which is secured on the shaft 14 engages pinions 62 which are rotatably mounted on a planet carrier 60 by means of bearings 66, the pinions also engaging a fixed ring gear 58. The planet carrier 60 is rotatably supported in a bearing 79 on the gearwheel -76. The planet carrier 60 is also formed with a bevel gear 86 with which also engage the bevel pinions 83 mounted on the radial shafts 82. |
