Rotor blade assembly

Abstract

Rotor blade and disk structures enabling the disassembly and reassembly of a single rotor blade are disclosed. The concepts are particularly suited to configurations employing interlocking mid-span shrouds which inhibit the withdrawal of a single blade from a disk. In one specific geometry the rotor blade root section (20) and the disk attachment slot (24) are contoured to provide increasing clearance between the bottom of the blade root section and the attachment slot as the blade is withdrawn axially from the slot. Rocking of the blade within the provided clearance enables withdrawal of the blade around the shroud segments (30,32) and airfoil sections (16) of the adjacent blades (12).

We claim: .[. 
     
       1.  For an axial flow gas turbine engine having a rotor assembly of a type including an array of rotor blades extending outwardly from the periphery of a rotor disk and wherein the airfoil section of each of said rotor blades has shroud segments extending laterally from the suction and pressure sides thereof into opposing relationship with corresponding shroud segments of the adjacent rotor blades, the improvement comprising: means for attaching each rotor blade to a corresponding attachment slot at the periphery of the rotor disk wherein the root section of the blade and the attachment slot of the disk are contoured to provide increasing clearance between the bottom of the blade root section and the attachment slot as the blade is withdrawn axially from the slot..].   
     
     
       2. .[.The invention according to claim 1.]. .Iadd.For an axial flow gas turbine engine having a rotor assembly of a type including an array of rotor blades extending outwardly from the periphery of a rotor disk and wherein the airfoil section of each of said rotor blades has shroud segments extending laterally from the suction and pressure sides thereof into opposing relationship with corresponding shroud segments of the adjacent rotor blades, the improvement comprising: means for attaching each rotor blade to a corresponding attachment slot at the periphery of the rotor disk wherein the root section of the blade is a dovetail-shaped root section, and wherein said root section and the attachment slot of the disk are contoured to provide increasing clearance between the bottom of the blade root section and the attachment slot as the blade is withdrawn axially from the slot and are contoured such that the blade root section is able to rock within such clearance, .Iaddend.wherein the disk attachment slot has a wedge-shaped protrusion extending from the center portion of the bottom of the attachment slot and tapered to increasing cross section from the front to the rear sides of the disk, and wherein the rotor blade root section has a bottom surface of taper corresponding to that of the wedge-shaped protrusion of the attachment slot.