TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
Page 83 of 323
PAR 50 TORQUE PATHS CHAP 2 SEC V 50. TORQUE PATH – FOURTH LOCKUP OPERATION (fig. GEAR, 26) Figure 26. Fourth-gear torque path, lockup operation a. Torque is transmitted to the turbine shaf in the manner described in pars. 42 and 43, above. In fourth gear, torque is trans- mitted directly by the high-range clutch and there is no planetary gear action. Engage- ment of the high-range clutch locks the turbine shaft and high-range clutch hub together. The high-range clutch hub is integral with the intermediate-range planetary carrier. The intermediate-range sun gear is splined to the turbine shaft. Therefore, the intermediate- range planetary gearing is locked and rotates as a unit. b. The low-range ring gear is attached to the intermediate-range planetary carrier. As a result, when the turbine shaft rotates, all members of all range planetary sets rotate with the turbine shaft, at the same speed. Thus, torque is transmitted from the turbine shaft to the output transfer drive gear at 1 to 1 ratio. c. The remainder of the torque path is identical to that for third gear. For gear ratios applicable to fourth gear, refer to TABULATED DATA, par. 7. 53