Auxiliary transmission section

A combined range and splitter type auxiliary transmission section for a compound change gear transmission comprising a main transmission section connected in series with an auxiliary transmission section, said auxiliary transmission section comprising a housing, an auxiliary section input shaft extending into said housing and driven by said main transmission section and an output shaft extending from said housing, said auxiliary transmission section characterized by:

• a splitter gear, a splitter/range gear and a range gear all generally coaxial with and rotatable relative to said auxiliary section input shaft and said output shaft;
• an auxiliary section countershaft assembly comprising an auxiliary countershaft rotationally supported in said housing, a first auxiliary countershaft gear rotationally fixed to said auxiliary countershaft and constantly meshed with said splitter gear, a second auxiliary countershaft gear rotationally fixed to said auxiliary countershaft and constantly meshed with said splitter/range gear and a third auxiliary countershaft gear rotationally fixed to said auxiliary countershaft and constantly meshed with said range gear;
• a two-position splitter clutch assembly fixed for rotation with said auxiliary section input shaft and having a first position for coupling said splitter gear to said auxiliary section input shaft and a second position for coupling said splitter/range gear to said auxililary section input shaft;
• a two-position range clutch assembly fixed for rotation with said output shaft and having a first position for coupling said splitter/range gear to said output shaft and a second position for coupling said range gear to said output shaft;
• and
• control means for independently positioning each of said splitter clutch assembly and range clutch assembly in a selected one of the two positions thereof.