Auxiliary transmission section

A splitter type auxiliary transmission section for a compound change gear transmission comprising an auxiliary transmission section, said auxiliary transmission section comprising a housing, a main transmission section and an auxiliary section input shaft extending into the housing and driven by the main transmission section and an output shaft extending from the housing, said auxiliary transmission section being characterized by:

• a mainshaft input gear rotationally fixed to said auxiliary section input shaft;
• a mainshaft splitter gear coaxial with and rotatable relative to said auxiliary section input shaft;
• an output shaft range gear coaxial with and rotatable relative to said output shaft;
• an auxiliary section countershaft assembly comprises an auxiliary countershaft rotationally supported in said housing, a countershaft splitter gear coaxial with and rotatable relative to said auxiliary countershaft and constantly meshed with said mainshaft input gear, a first auxiliary countershaft gear rotationally fixed to said auxiliary countershaft and constantly meshed with the mainshaft splitter gear, and a second auxiliary countershaft gear rotationally fixed to the auxiliary countershaft and constantly meshed with said output shaft range gear;
• a first one engaged position splitter clutch assembly is fixed for rotation with said auxiliary section input shaft for coupling said mainshaft splitter gear with said auxiliary section input shaft;
• a second one engaged position splitter clutch assembly fixed for rotation with said auxiliary section countershaft for coupling said countershaft splitter gear with said auxiliary section countershaft;
• and
• control means for alternatively positioning one of said clutch assemblies for alternatively positioning one of said clutch assemblies for engagement thereof to establish a torque flow path from said auxiliary section input shaft to the output shaft.