GB1394739A - Compressor or turbine rotor - Google Patents

Abstract

1394739 Turbine and compressor bladed rotors ROLLS-ROYCE (1971) Ltd 17 May 1973 [25 May 1972] 24568/72 Heading FIT A turbine or compressor rotor comprises a filament wound drum having at least one row of apertures therein adapted to receive the root portions of a row of rotor blades. By the term "filament wound" is meant formed from a length or plurality of lengths of a fibrous material which is wound to form the desired shape and simultaneously or subsequently embedded in a matrix material. The rotor shown is a compressor rotor of a gas turbine engine and comprises a cylindrical web portion 29 with four flanges 30 between which are formed apertures 31 for reception of blade root portions 40. The web 29 is connected integrally by means of a frusto-conical portion 32 with a further web 33 similarly formed with flanges 34 and apertures 35, and the web 33 is in turn connected integrally by a frusto-conical portion 36 with a further web 37 similarly formed with flanges 38 and apertures 39. The blades are also formed of fibre material and the roots 40 are in the form of loops which are inserted through the apertures 31 and are retained by pins 41 passed through the loops below the web 29, a spreader member 42 having an arcuate outer surface and a recess to receive the pin being provided. Filler pieces 44 are provided between adjacent blades of a blade row, the filler pieces engaging against projections 45 formed at both sides of the blades. In a second embodiment the rotor drum is formed with inwardly-directed flanges 55, 56, 57 the blade roots 58, 59 being again in the form of loops which extend through apertures between the flanges and are retained by pins 61, 62, annular rings 63 being incorporated in the rotor drum during the winding phase of manufacture. The rotor may be formed of carbon fibres embedded in an epoxy resin matrix.