Fan blade retaining structure

Abstract

A disk 10 includes a plurality of dovetail grooves 12 which are spaced at a predetermined angular interval in a circumferential direction and extend in an axial direction. A fan blade 20 includes a dovetail part 22 which is fitted to each of the dovetail grooves in an axial direction and capable of transmitting a centrifugal force produced during rotation to the disk. The disk further includes a flange part 14 which is positioned in front of the dovetail grooves and extends outward in a radial direction. A ring-shape retainer member 30 is fitted between a front surface 22 a of the dovetail part 22 and a rear surface 16 a of the flange part 14 and transmits an axial forward load acting on the fan blade 20 to the disk 10 via the rear surface 16 a of the flange part.

1 . A fan blade retaining structure in which a plurality of fan blades is configured to be attached to an outer periphery of a disk rotationally driven by a turbine,
 wherein the disk includes a plurality of dovetail grooves configured to be spaced at a predetermined angular interval in a circumferential direction and to extend in an axial direction,   wherein each of the fan blades includes a dovetail part configured to be fitted to each of the dovetail grooves in an axial direction and capable of transmitting a centrifugal force produced during rotation to the disk,   wherein the disk includes a flange part configured to be positioned in front of the dovetail grooves and to extend outward in a radial direction, and   wherein the fan blade retaining structure further comprises a ring-shape retainer member configured to be fitted between a front surface of the dovetail part and a rear surface of the flange part so as to transmit an axial forward load acting on the fan blade to the disk via the rear surface of the flange part.   
   
   
       2 . The fan blade retaining structure according to  claim 1 , wherein the flange part of the disk includes disk tooth parts configured to be spaced at a predetermined angular interval in a circumferential direction and to project outward in a radial direction,
 wherein the retainer member includes a ring part configured to have a rear surface coming into contact with the front surface of the dovetail part and retainer tooth parts configured to be formed inside the ring part so as to be spaced at a predetermined angular interval in a circumferential direction and to project inward in a radial direction, and   wherein each of the retainer tooth parts is capable of passing between the adjacent disk tooth parts in an axial direction and comes close to the rear surface of the disk tooth part to overlap therewith at the same position in a circumferential direction.   
   
   
       3 . The fan blade retaining structure according to  claim 2 , further comprising:
 a fastener configured to fix the retainer tooth part to the disk tooth part in a state where the retainer tooth part comes close to the disk tooth part to overlap with each other.   
   
   
       4 . The fan blade retaining structure according to  claim 2 , wherein the disk tooth part is formed at a position between the adjacent dovetail grooves in a circumferential direction. 
   
   
       5 . The fan blade retaining structure according to  claim 2 , wherein the disk tooth part is formed at the same position as that of the dovetail groove in a circumferential direction.