TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
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Figure 23 CHAP 2, SEC V TORQUE PATHS PAR 47 47. TORQUE PATH – FIRST GEAR, CONVERTER OPERATION (fig. 23) a. In first gear, torque is transmitted to the turbine shaft through the input transfer gearing and the torque converter (or lockup clutch). The low-range sun gear is splined to the turbine shaft and imparts torque to the low-range planetary pinions. The low-range clutch is engaged, holding the low-range ring gear stationary. Thus, the low--range plane- tary pinions must rotate within the stationary ring gear. This drives the low-range plane- tary carrier and shaft in the same direction as the turbine shaft but at reduced speed. b. The low-range carrier shaft drives the output transfer drive gear. In turn, the drive gear transmits torque to the output trans- fer driven gear, causing it to rotate in the op- posite direction. The driven gear transmits torque to the right- and left-geared steer planetary ring gears. c. The right- and left-geared steer clutches are engaged, holding the geared steer sun gears stationary. The geared steer plane- tary pinions, meshed with both the sun gears and ring gears, are forced to rotate around the stationary sun gears. The carrier thus becomes the output member of the geared steer planetary. Rotation at reduced speed is trans- mitted to the right- and left-output couplings. Refer to par. 7 for gear ratios applicable to first gear. 50