TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
Page 82 of 323
CHAP 2, SEC V TORQUE PATHS PAR 49 Figure 25. Third-gear torque path, lockup operation 49. TORQUE PATH – THIRD GEAR, LOCKUP OPERATION (fig. 25) a. Torque is transmitted to the low- and intermediate-range planetary sun gears in the manner described in pars. 42 and 43, above. In third gear, the low- and intermediate-range planetary gears are compounded to produce the desired speed reduction ratio. The inter- mediate-range clutch is engaged, holding the intermediate-range ring gear stationary. The intermediate-range planetary pinions, meshed with the intermediate-range sun gear, which is rotating, and the stationary ring gear, must rotate within the ring gear. This action drives the intermediate-range planetary carrier. b. The low-range planetary ring gear is attached to the intermediate-range carrier and rotates at a slower speed than the low-range sun gear. Thus, the faster moving sun gear, and slower moving ring gear, combine to drive the low-range planetary pinions. The output member of this compound arrangement is the low-range planetary carrier and shaft. c. The remainder of the torque path is identical to that described for second gear (par. 48, above). Refer to TABULATED DATA, par. 7, for gear ratios applicable to third gear. 52