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2.4
ROTOR COMPONENT DESCRIPTION
a.
The fan rotor component (Figure 2.4) is a single-stage, axial
flow compressor which pumps air downward to produce lift.
The rotor
consists of a shaft and disc, retainer rings, blades, blade platforms,
torque band seals, blade shroud covers, blade carrier pins, a carrier
assembly which includes turbine buckets, and carrier tabs.
2.5
Shaft and Disc
a.
The rotor shaft and disc (Figure 2.4) are made of SAE 4340 steel.
The hollow rotor shaft and each of the two cones that make up the disc
are machined from individual forgings to a 0.030" - 0.060" envelope,
heat treated, and final machined except for surfaces affecting final
assembly tolerances.
The two cones are bolted together with 36 tie bolts
at the outside diameter to form the rim of the disc.
The cones are shrink-
fitted to the shaft to form a permanent disc-shaft assembly.
Final
machining of assembly surfaces and broaching of the blade dovetail slots
completes the disc-shaft assembly.
2.6
Blade Retainer Rings
a.
Each rotor assembly has two blade retainer rings (Figure 2.4).
The rings are bolted one to each side of the disc rim; they prevent
axial translation of the blade dovetails and provide attachment for the
blade platforms.
The rings are formed of 0.045" 17-7 PH sheet and contain
36 holes around the circumference to accommodate the tie bolts.
Thirty-six
equally spaced tabs (stamped from 0.022" 17-7 PH sheet) are spot welded to
each ring; an anchor nut is spot welded to each tab to provide an attachment
for the blade platforms.
2.7
Rotor Blades
a.
The rotor has 36 blades (Figure 2.4) which pump the air downward
to produce lift.
The blades have a constant section airfoil and are made
without platforms.
Each blade is rough machined from either an oversized
1-2.4
)
R-1
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