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end of the tail boom – in some cases on top of the tail
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5-7
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5-8
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boom vertical fin (Figure 5-9). The gearbox is splash- change in tail rotor drive shaft direction and a
lubricated. It consists of mating input and output specific speed reduction between input shaft and
gear assemblies set into a case provided with a vented output shaft on which the tail rotor assembly is
oil filter cap, oil level sight gage, and a drain plug with
a magnetic insert plug for collecting metal particles.
By analyzing these metal particles, the condition of
the gearbox gears and bearings can be determined.
Flexible couplings are provided for attaching the tail
rotor drive shaft onto the input end of the gearbox.
The tail rotor gearbox provides a specific degree
mounted.
5-9
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CHAPTER 6
TANDEM-ROTOR POWER TRAIN SYSTEM
A typical tandem-rotor power train system consists
of an engine transmission for each of the two engines
and an engine-combining transmission (Figure 6-1).
The system also includes a forward rotary-wing drive
transmission (containing a rotary-wing drive shaft
[mast]) and an aft rotary-wing drive transmission
(containing a rotary-wing drive shaft [mast]). The
drive shaft consists of an engine drive shaft asthe
engine-combining transmission. This assembly is
used by the engine to drive the engine-combining
transmission. The drive shaft assembly also consists
of a forward synchronizing drive shaft assembly
through which the engine-combining transmission
drives the forward rotary-wing drive transmission
and an aft synchronizing drive shaft assembly through
which the engine-combining transmission drives the
sembly between each engine transmission and aft rotary-wing drive transmission.
6-1
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ENGINE TRANSMISSION transmissions provide angle of drive and RPM reduction
in torque. Torque from the engine is transmitted
The two engine transmissions are identical as- by the engine transmission and engine drive shaft
semblies. Minor rearrangement of transmission ex- assembly to the engine-combining transmission.
ternal parts provides interchangeability between Freewheeling is provided in the output shaft of the
right- and left-hand engine transmission installa- engine transmissions. This permits the drive system
tions. The transmissions are mounted directly on the to overrun the engine during failure, a sudden reducengine
being driven by the engine output shaft. The tion of RPM, or autorotation. (See Figure 6-2.)
6-2
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Oil System Components
For each engine transmission there is a complete and
separate oil system (Figure 6-3). The oil system is
made up of the transmission sump, transmission
lubrication jets, check valve, electrical chip detector,
oil temperature transmitter (bulb), oil pump, oil
pressure transmitter (transducer), filter and relief
valve assembly, oil tank, and oil cooler. Although the
oil systems of the engine transmission and enginecombining
transmission are not interconnected, oil
the left-hand engine transmission, and one section
for the engine-combining transmission. The oil filter
and relief valve assembly for each of the engine transmissions
and engine-combining transmission are
mounted on the aft side of the oil tank. The oil cooler
for the engine transmissions is mounted on top of the
combining transmission. It receives cooling air from
the fan assembly mounted on top of the combining
transmission.
Oil Circulation
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The engine-combining transmission is a three- flows from the oil tank through the pressure pump,
section tank that is mounted onto and above the through the filter and relief valve assembly, through
engine-combining transmission: one section for the oil coder, and through the check valve. Then the
the right-hand engine transmission, one section for oil flows into the transmission where it is sprayed on
6-3
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the gears and bearings by various jets. Oil is
scavenged from the sump by the scavenge section of
the oil pump and returned to the oil tank.
ENGINE-COMBINING TRANSMISSION
The combining transmission is a central collection
and distribution point for the drive system. The combining
transmission is mounted in the lower forward
section of the pylon. Torque from the engine transmission
　
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