Patent GB-856347-A (GB)
Title: Combustion turbine power units
Inventor: GILBERT RONALD ALBERT
IPC: B64C27/18
Filed: 1957-06-27
Abstract: 856,347. Gas turbine plant. NAPIER & SON Ltd., D. Sept. 12, 1958 [June 27, 1957], No. 20348/57. Addition to 787,738. Class 110(3). A combustion turbine power unit comprises an air compressor driven by a compressordriving turbine, a power turbine separate from and downstream of the compressor-driving turbine and connected to the output shaft of the power unit through reduction gearing arranged within a rigid casing disposed on the side of the power turbine remote from the compressor, and exhaust ducting disposed on the same side of the power turbine as the reduction gear casing for carrying away the exhaust gases from the turbines. A series of circumferentially-spaced, stress-transmitting members are provided which connect the reduction gear casing to the casing of the power turbine independently of the exhaust ducting, bearings for the power turbine being mounted in the reduction gear casing. The power turbine 10, 11 only of the power plant is shown in Fig. 1, exhaust gases from the turbine discharging through exhaust ducting 12 arranged as shown in the parent Specification, the ducting having been omitted from the lower part of the Figure for the sake of clarity. The power turbine rotor 11 is formed integrally with a cylindrical sleeve 14 which is supported within the reduction gear casing 13 by means of a main ball-bearing 17, 18. A hollow shaft 19 is secured to the centre of the rotor disc 11 and extends through the cylindrical sleeve 14, being a snug fit therein at 20, 21. The downstream end of the shaft 19 is supported in a bearing 23 within a rotatable planet carrier 24 of epicyclic reduction gearing through which the turbine drive is transmitted.. A cylindrical sleeve 27 is disposed around the shaft 19 and projects into the annular space 22 formed between the shaft 19 and the sleeve 14, the sleeve 27 having splined engagement at 29, 30 with the sleeve 14 in the region of the main bearing 17, 18. The downstream end of the sleeve 27 is supported by a bearing 28 in the planet carrier 24. The sleeve 27 is formed with gear-teeth 31 which constitute the sun gear of the epicyclic gearing and planet pinions 35 mounted on hollow shaft 37 engage therewith. The pinions 35 also engage with a fixed ring-gear 33 mounted in the reduction gear casing 13. The shafts 37 are fixed to the planet carrier 24 and the output of the reduction gearing is taken from the planet carrier by a splined connection 38. The reduction gear casing 13 comprises sheet metal pressings 40, 41, 42, 43 and 44 which are rigidly secured to machined members 45, 46, 47, 48 and 49 by welded or bolted joints. The power turbine 10, 11 is located within the turbine casing 40 by means of four arms 51 which are welded to the reduction gear casing 13 and project radially therefrom. The arms 51 are connected to A-brackets 57 by means of pins 55, the feet of the A-brackets being rigidly secured to the turbine casing 50 by bolts 59. The brackets 57 are capable of limited deflection in the radial direction but are rigid in the circumferential direction. Specification 836,142 also is referred to.