GB815507A - Improvements in or relating to bladed rotors for axial-flow fluid machines - Google Patents

Abstract

815,507. Bladed rotors for axial-flow fluid machines. ROLLS-ROYCE Ltd. Sept. 9, 1955 [Oct. 1, 1954], No. 3914/59. Divided out of 815,506. Class 110 (3). [Also in Group XXV] In a bladed rotor for an axial-flow fluid machine in which the blade elements 14 are secured to the periphery of a rotor disc 10 by means of pivot pins 17 which engage aligned holes in flanges 12, 13 on the disc periphery and lugs 16 forming part of the blade roots, means for preventing disengagement of the pivot pins from the holes in the flanges and lugs comprises radially-extending plates 28 mounted on and having interlocking engagement with the periphery of the disc, the plates overlapping and co-operating with axially-facing end surfaces of the pivot pins to prevent their disengagement in one direction. In a first embodiment, the pivot pins 17 are formed with flanged heads 17c which prevent axial movement of the pins in one direction (to the right as seen in Fig. 2), axial movement in the other direction being prevented by means of plates 28 which abut against the end surfaces of the heads. The outer edges 18a of the plates engage in an inwardly-facing circumferential groove formed in the flange 20 at the outer edge of the flange 13, and the inner edges of lugs 28a of the plates engage in outwardly-facing circumferential grooves in projections 21 on the flange 13. The last plate 28 to be inserted is provided with tabs 28b which after assembly are bent downwardly to engage two of the projections 21 so as to prevent circumferential movement in either direction. In a second embodiment, plain cylindrical pivot pins are utilized and plates such as 28 shown in Figs. 1 and 2 are mounted on both sides of the disc.