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is transmitted by the combining transmission
and the forward and aft synchronizing drive shafts to
the forward and aft rotary-wing drive transmission.
Speed reduction is also attained within the combining
transmission. The output shaft drives the lubricated
pump. The three-section oil tank (one section
each for the combining transmission and each engine
transmission) forms the uppermost portion of the
combining transmission.
Oil System Components
The combining transmission oil system is a complete
and separate oil system. The system includes the oil
sump, oil temperature transmitter (bulb), oil pump,
oil pressure transmitter (transducer), filter and relief
valve, bypass valve, transmission lubricating jets,
check valve, magnetic chip detector, oil tank, and oil
coolers.
NOTE: The reservoir for the oil system is
the center section of the three-section oil
tank on the combining transmission. The
three-section oil cooler and fan assembly is
mounted on the top section of the transmission.
Oil Circulation
Oil is circulated by two separate elements: one
pressure element and one scavenge element of the
six-element oil pump in the combining transmission
(Figures 6-4 and 6-5). Oil is routed from the
oil tank through the filter and bypass valve and
through an external line to the oil cooler. The oil is
then routed by an external line through a check valve
to the transmission. In the transmission oil is distributed
through internal passages and jets and is
sprayed on bearings and gears. Oil is scavenged from
the sump through internal passages by the scavenge
clement of the oil pump. The pump then pumps the
oil to the tank. A sight level gage is installed on the
forward end of the oil tank.
FORWARD ROTARY-WING DRIVE TRANSMISSION
Torque is delivered to the forward rotary-wing drive
transmission by the forward synchronizing drive shaft
from the combining transmission (Figure 6-6). The
forward rotary-wing transmission then changes the
direction of torque from a horizontal plane to a
vertical plane. This reduces the input shaft speed.
The forward rotary-wing transmission transmits the
torque through the rotary-wing drive shaft (mast) to
the rotor head.
Oil System Component
The oil system serving the forward rotary-wing drive
transmission is a complete, separate system. It is a
wet-sump system, which includes the oil temperature
transmitter (bulb), screens, oil pressure
pump, oil pressure transmitter (transducer), relief
valve, pressure filter, magnetic chip detector, oil
cooler, and No. 1 flight control pump.
Oil Circulation
Oil from the sump flows through the screen to the
inlet of the pressure pump. The pump pressurizes
the system and pumps oil through the filter and
cooler and then back to the transmission. Drilled
and cored passages in the transmission distribute the
oil to lubricators and oil jets. The lubricators and jets
spray the oil into the transmission bearings and onto
the rotating gears.
AFT ROTARY-WING DRIVE TRANSMISSION
Torque is delivered to the aft rotary-wing drive transmission
by the aft synchronizing drive shaft from the
combining transmission. The direction of torque
changes from a horizontal plane to a vertical plane,
and the aft rotary-wing transmission reduces input
shaft speed (Figure 6-7). The aft rotary-wing transmission
transmits the torque through the rotary-wing
drive shaft (mast) to the rotor head. In addition to
the reduction gearing, there are two accessory drive
gears. One, driven by the input shaft, drives the
transmission oil-cooling fan shaft and an oil scavenge
pump. A second accessory gear drives the accessory
gear section. The accessory gear section consists of
gearing for driving the lubrication pump, one flightcontrol
hydraulic pump, two AC generators, and a
utility hydraulic pump. A one-way-drive clutch is
united into one body in the accessory gear drive
shaft for the accessory gear section. This type of
clutch permits the accessory gears to overrun the
6-4
FM 1-514
FM 1-514
6-6
FM 1-514
transmission gears when the accessory gears are Oil System Components
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6-7
FM 1-514
FM 1-514
6-9
FM 1-514
the temperature transmitter (bulb), magnetic chip
detector, screens, drain valve, oil level sight gage, oil
　
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