TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
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CHAP 2, SEC V TORQUE PATHS PAR 51 51. TORQUE PATH – REVERSE 1 GEAR, CONVERTER OPERATION (fig. 27) a. Torque is transmitted to the turbine shaft in the manner described in pars. 42 and 43, above. In reverse range, torque is trans- mitted from the turbine shaft to the output transfer drive gear by a compound arrange- ment of the reverse-range and low-range planetary gears. b. The input member of this compound ar- rangement is the low-range sun gear. Torque is transmitted to the low-range pinions which rotate in the direction opposite the sun gear. The slower moving, low-range carrier, al- though it is rotating, is a reaction member. The low-range ring gear, meshed with its pinions, rotates in the direction opposite the sun gear. Thus, the reversal of rotation ac- tually occurs in the low-range planetary. Figure 27. Reverse 1-gear torque path, converter operation c. The reverse-range sun gear is at- tached to the low-range ring gear and rotates with it. The reverse-range clutch is engaged, holding the reverse-range ring gear stationary. The reverse-range planetary pinions are in mesh with both the ring gear and sun gear. The rotation of the reverse-range sun gear forces the pinions to rotate within the station- ary ring gear. This drives the reverse-range carrier in the same direction as, but at a slower speed than, the sun gear. The reverse- range carrier, splined to the low-range plane- tary carrier shaft, drives the output transfer drive gear. d. The remainder of the torque path is identical to that described for first gear in par. 47b and c , above. Refer to TABULATED DATA, par. 7, for gear ratios applicable to reverse 1 gear. 54