TM 5-2410-241-23-1
0009
PRIMARY POWERTRAIN CONTINUED
Torque Divider Operation
0009
The torque converter is driven by the engine through the housing (Figure 8, Item 3). The planetary gear set is
driven by the engine through the sun gear (Figure 8, Item 12). These connections allow the torque output of the
engine to go in two separate directions.
Because of the larger radius of the ring gear (Figure 8, Item 2), most of the torque is sent by the torque converter
through the ring gear to the planetary gears (Figure 8, Item 13). The remainder of the torque is sent by the sun
gear (Figure 8, Item 12) to the planetary gears (Figure 8, Item 13). The sun gear (Figure 8, Item 12), planetary
gears (Figure 8, Item 13), planetary carrier (Figure 8, Item 14) and ring gear (Figure 8, Item 2) turn at the same
speed when the planetary carrier (Figure 8, Item 14) has no resistance to rotation.
The torque from the torque converter turbine and the planetary gear set is sent through the planetary carrier to the
output shaft (Figure 8, Item 8) and the planetary transmission. When the torque converter and the planetary gears
turn at the same speed, torque from the engine cannot be multiplied.
When the machine operates under a load, the planetary carrier (Figure 8, Item 14) has a resistance to rotation.
Since the sun gear (Figure 8, Item 12) turns at the speed of the engine, the resistance to rotation turns the
planetary gears (Figure 8, Item 13). The rotation is opposite to the rotation of the ring gear, which decreases the
speed of the ring gear.
The turbine (Figure 8, Item 11) is connected to the ring gear so a decrease in speed causes the torque converter to
multiply the torque of the engine from the housing (Figure 8, Item 3). The torque multiplication is sent to the
planetary carrier (Figure 8, Item 14) and to the output shaft through the ring gear.
Figure 8. Torque Divider.
0009
