Straight Travel Torque Paths

TM 9-2520-249-34&P

2-50.

Straight Travel Torque Paths

a. First Gear--Straight Travel (fig. 2-15 ).

Figure 2-15. First gear, straight travel-operation-torque path.

(1) In first gear, torque is transmitted to

the left-and right-output shafts by the steer planetary

the converter output shaft as described in

gears, used in this case as drive gears.

paragraph 2-49a. The low-range clutch is engaged and

(3) The geared steer clutches are

engaged and hold the steer sun gears stationary. The

holds the low-range ring gear stationary. The low-range

steer planetary ring gears are attached to the cross shaft

sun gear rotates and drives the low-range pinions within

and are the driving members. The rotating ring gears

the stationary ring gear. The pinions, being mounted to

force the steer planetary pinions to rotate around the

the low-range planetary carrier, cause the carrier to

stationary sun gears which, in turn, drive the planetary

rotate. The low-range planetary carrier is splined to the

carriers.

bevel drive gear which transmits the rotation to the

(4) The carriers are splined to the output

bevel driven gear and cross shaft.

shafts which, in turn, are splined to the output reduction

(2) The cross shaft delivers torque to the

transfer drive gears.

The total mechanical speed

left and right output sections. During straight travel, the

reduction ratio from the engine through the transmission

functional operations that occur in one output section

outputs is 19.832 to 1. At output stall, the total torque

are identical to those that occur in the opposite section.

ratio available (output-to-engine) is (2.6 x 19.832)

In first gear, torque is transmitted from the cross shaft to

51.563 to 1.

2-31