Compound transmission having four speed auxiliary construction

A compound transmission comprising:

• a main section including:
• an input shaft having an input gear rotationally fixed thereto,
• a mainshaft having a plurality of drive gears rotatably mounted thereon and a plurality of clutches rotationally fixed thereto for selectively clutching the drive gears to the mainshaft,
• at least one countershaft drivable by the input gear, the countershaft having a plurality of countershaft gears rotationally fixed thereto and engaging a corresponding mainshaft drive gear;
• and
• an auxiliary section including:
• a first auxiliary section clutch rotatable with the mainshaft,
• an output shaft having an auxiliary drive gear, splitter gear, and reduction gear rotatably mounted thereon,
• at least one countershaft having first, second and third countershaft gears rotationally fixed thereto and rotatably engaged with the auxiliary drive gear, splitter gear and reduction gear, respectively, and
• a second clutch rotatable with the output shaft and having a first position for coupling the reduction gear to the output shaft and a second position for coupling the splitter gear to the output shaft;
• the first clutch having a first position for coupling the mainshaft to the splitter gear and a second position for coupling the mainshaft to the auxiliary drive gear.

A compound transmission comprising:

• a main section providing five selectable forward speed ratios, the main section including:
• an input shaft having an input gear rotationally fixed thereto,
• a mainshaft having a plurality of drive gears rotatably mounted thereon and a plurality of clutches rotationally fixed thereto for selectively clutching the drive gears to the mainshaft,
• at least one countershaft drivable by the input gear, the countershaft having a plurality of countershaft gears rotationally fixed thereto and engaging a corresponding mainshaft drive gear;
• and
• an auxiliary section providing four selectable ratios, the auxiliary section including:
• a splitter clutch rotatable with the mainshaft,
• an output shaft generally coaxial with the mainshaft and having a splitter gear and a reduction gear rotatably mounted thereon,
• an auxiliary drive gear rotatably mounted on an extension of the splitter gear,
• at least one countershaft having first, second and third countershaft gears rotationally fixed thereto and rotatably engaged with the auxiliary drive gear, splitter gear and reduction gear, respectively, and
• a synchronized range clutch rotatable with the output shaft and having a first position for coupling the reduction gear to the output shaft to provide low range ratios, and a second position for coupling the splitter gear to the output shaft to provide high range ratios;
• the splitter clutch having a first position for coupling the mainshaft to the splitter gear and a second position for coupling the mainshaft to the auxiliary drive gear.