*TM 1-1500-204-23-5
3-4.16
Change 3
l.
Aft Rotary--Wing Drive Transmission.
Torque is
delivered to the aft rotary--wing drive transmission by the
aft synchronizmg drive shaft from the combimng trans-
mission. The direction of torque changes from a horizon-
tal plane to a vertical plane, and the aft rotary--wing trans-
mission reduces input shaft speed (Figure 3-3.O). 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 accesso-
ry 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 hydrau-
lic 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 transmission gears when the accessory
gears are being driven by the hydraulic motor. In normal
operation the accessory gears are driven by the bevel
gear in the transmission through the clutch.
Figure
3-3.N. Sectional View of Forward Transmission.
