Mounting arrangement for fixing a fan blade to a disk of a turbojet engine

Abstract

A turbojet engine fan rotor including a rotor disk having a peripheral rim with a plurality of axially extending channels carrying a plurality of fan blades each having a blade root interengaging with the channels of the disk, and a mounting arrangement for securing the blades to the disk. The mounting arrangement includes an annular member having a plurality of radially extending teeth, a plurality of wedges each interposed between one of the blade roots and a corresponding one of the channels and including a radially extending boss provided at one end, and a plurality of radially extending protrusions from the disk. The plurality of teeth and the plurality of protrusions cooperate with one another to secure the annular member with the rotor disk.

We claim:  
     
         1 . A turbojet engine fan rotor including a rotor disk having a central axis and a peripheral rim with a plurality of axially extending channels at spaced apart angular intervals, a plurality of fan blades carried by said rim, each of said fan blades having a blade root interengaging with one of said channels of the rim of the disk and having surfaces configured and dimensioned corresponding to axially facing surfaces of said channels, and a mounting arrangement for securing said blades to said disk, said mounting arrangement comprising: 
 an annular member having a plurality of teeth radially extending therefrom and spaced apart at regular angular intervals, said annular member having a radially inner portion fastened to a radially inner portion of said disk;    a plurality of wedges each interposed between one of said blade roots and a corresponding one of said channels, each of said wedges having a radially extending boss provided at one end and axially interposed between said annular member and said blade roots; and    said disk having a plurality of radially extending protrusions spaced apart at intervening angular intervals relative to said channels and disposed at angular positions of said plurality of teeth, said plurality of protrusions being arranged to overlap simultaneously with said plurality of teeth such that upon axial displacement of said blades, said plurality of teeth and said plurality of protrusions cooperate with one another to retain said annular member with said rotor disk.    
     
     
         2 . The rotor fan according to  claim 1  wherein the plurality of teeth extend radially inwardly or outwardly according to an opposite direction of radial extension of said plurality of protrusions.  
     
     
         3 . The rotor fan according to  claim 1  wherein each of said plurality of teeth subtend a clearance between a corresponding one of said plurality of protrusions, said clearance being parallel to said central axis of said disk.  
     
     
         4 . The rotor fan according to  claim 1  wherein said radially inner portion of said annular member is fastened to said radially inner portion of said disk with a plurality of spindles running parallel to the central axis of said disk.