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pressure pump, oil pressure transmitter
(transducer), relief valve, pressure filter, and oil
cooler. DRIVE SHAFTS
NOTE: The sump is the lower circular casting
of the transmission. The fan drive shaft
drives an oil scavenger pump in the fan drive
housing. The pump returns scavenge oil
which collects in the forward part of the
transmission when the aircraft is in a nosedown
attitude.
Oil Circulation
Oil is drawn from the sump, through the screen to the
inlet of the pressure pump. The pump pressurizes
the system and pumps the oil through the filter and
cooler and back to the transmission. Oil is supplied
through external piping to the aft rotary-wing drive
shaft (mast) thrust bearing. Drilled and cored passages
in the transmission unit distribute oil to
lubricators and jets. The lubricators and jets spray
oil into the transmission bearings and onto the rotating
gears. A scavenge pump in the fan drive housing
is driven by the fan drive shaft. The pump returns
scavrnged oil which collects in the forward part of
the transmission when the aircraft is in a nose-down
attitude.
The purpose of drive shafting is to transmit torque
from the engines to the transmissions and rotors. It
also transmits torque to the fan assembly.
Engine Drive Shaft
There are two engine drive shaft assemblies in each
tandem-rotor power train system (Figure 6-9). The
purpose of the engine drive shift assembly is to transmit
torque from each of the engine transmissions to
the combining transmission. The shaft is a hollow,
dynamically balanced tube. Each shaft is connected
to the combining transmission and engine transmission
by an adapter and plate assemblies, one on each
end of the shaft. The adapter and plate assemblies
provide flexibility in the shaft assembly.
Forward Synchronizing Drive Shaft
The purpose of the forward synchronizing drive shaft
is to transmit torque from the engine-combining
transmission. It also keeps the forward and aft
6-10
FM 1-514
rotors mechanically connected and in phase with
each other. The shafting assembly consists of a
series of shafts, each of which is a hollow, dynamically
balanced tube. Each shaft is interconnected to
the other, to the combining transmission on the aft
end, and to the forward rotary-wing drive transmission
on the forward end by an adapter and plate
assembly. The shaft is mounted and supported by
bearings and support assemblies which contain shock
mounts.
Synchronizing Drive Shaft
The purpose of the aft synchronizing drive shaft
is to transmit torque from the engine-combining
transmission to the aft rotary-wing drive transmission
(Figure 6-10). The aft synchronizing drive
shaft is similar to and supported in the same manner
as the forward synchronizing drive shaft assembly.
The only difference is that the aft synchronizing
shaft assemblv. contains fewer shaft units and fewer
supports.
6-11

 

FM 1-514
REFERENCES
DOCUMENTS NEEDED
These documents must be available to the intended users of this publication.
TM 55-15W-W-23. Avionic Cleaning and Corrosion Prevention/Control. 22 April 1987
TM 55-4920-402-13&P. Operator’s, Aviation Unit and Intermediate Maintenace Manual (Including Repair
Parts and Special Tools Lists) for Vibrex Balancing Kit. 15 August 1980.
DA Form 2402 Exchange Tag. December 1985.
DA Form 2410. Component Removal and Repair/Overhaul Record. May 1981.
READINGS RECOMMENDED
These readings contain relevant supplemental information.
AR 310-25. Dictionary of United States Army Terms (Short Title: AD). 15 October 1983.
AR 310-50. Authorized Abbreviations and Brevity Codes. 15 November 1985.
DA Pamphlet 25-30. Consolidated Index of Army Publications and Blank Forms. 31 December 1989.
DA Pamphlet 738-751. Functional Users Manual for the Army Maintenance Management System -
Aviation (TAMMS-A). 15 January 1988.
TM 55-1500-335-23. Nondestructive Inspection Methods. 1 June 1984.
Reference-1

 

　
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