REVISED: 10 MAR 2015 7-2
ROTOR SYSTEMS
The main rotor has two all-metal blades mounted to the hub
by coning hinges. The hub is mounted to the shaft by a
teeter hinge. The coning and teeter hinges use self-lubricated
bearings. Droop stops for the main rotor blades provide a
teeter hinge friction restraint which normally prevents the
rotor from teetering while starting or stopping. Pitch change
bearings for each blade are enclosed in a housing at the
blade root. The housing is filled with oil and sealed with
an elastomeric boot. Each blade has a thick stainless steel
spar at the leading edge which is resistant to corrosion and
erosion. The skins are bonded to the spar approximately
one inch aft of the leading edge. Blades must be refinished
if the paint erodes to bare metal at the skin-to-spar bond
line. Bond may be damaged if bond line is exposed.
The tail rotor has two all-metal blades and a teetering hub
with a fixed coning angle. The pitch change bearings have
self-lubricated liners. The teeter hinge bearings either
have self-lubricated liners or are elastomeric. The tail
rotor blades are constructed with aluminum skins and root
fittings. Maintaining the paint finish will reduce corrosion
and erosion.
DRIVE SYSTEM
A vee-belt sheave is bolted directly to the engine output
shaft. Vee-belts transmit power to the upper sheave
which has an overrunning clutch contained in its hub. The
inner shaft of the clutch transmits power forward to the
main rotor and aft to the tail rotor. Flexible couplings are
located at the main gearbox input and at each end of the
long tail rotor drive shaft.
The main gearbox contains a single-stage spiral-bevel gear
set which is splash lubricated. Cooling ducts under the
gearbox are connected to the top of the engine cooling scroll.
The main gearbox is supported by four rubber mounts.
ROBINSON
MODEL R44
SECTION 7
SYSTEMS DESCRIPTION
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