Manual control for extended range splitter type compound transmission

A control for an extended range compound splitter type change gear transmission (10) comprising a housing (16) defining a multiple speed main transmission section (12) connected in series with a multiple speed auxiliary transmission section (14) connected in series with a multiple speed extended range section (15);

• said main transmission section (12) comprising an input shaft (18) having an input gear (22) rotationally fixed thereto, a mainshaft (28) generally coaxial with said input shaft in extended into said auxiliary transmission section at least one countershaft (24, 26) rotationally supported in said housing and driven by said input gear, a plurality of countershaft gears (36, 38, 40, 42) fixed to said countershaft, a plurality of main section mainshaft gears (46, 48, 50) surrounding but not constantly engaged with said mainshaft and constantly driven by said countershaft gears, one of said main section mainshaft gears defining a lowest main section speed ratio and another of said main section mainshaft gears defining a second lowest main section speed ratio, and main section jaw clutch assemblies (56, 58, 60) for selectively clutching said input gear and said main section mainshaft gears, one at a time, to said mainshaft;
• said auxiliary transmission section (14) comprising at least one auxiliary countershaft (78, 80) rotationally supported in said housing, an intermediate shaft (200) generally coaxial with said mainshaft, said auxiliary countershaft having a plurality of auxiliary countershaft gears (84, 86 88) fixed thereto, an output gear (112) splined to said intermediate shaft for rotational movement therewith, said output gear constantly meshed with one (88) of said auxiliary countershaft gears, at least one auxiliary mainshaft gear (108, 110) surrounding said mainshaft for rotational movement relative thereto, said auxiliary mainshaft gear constantly meshed with another (84, 86) of said auxiliary countershaft gears, auxiliary section jaw clutch assemblies (116, 118, 120) for selectively coupling said auxiliary mainshaft gear and said output gear, one at a time, to said mainshaft;
• said extended range section (15) comprising an output shaft (74) generally coaxial with said mainshaft and said intermediate shaft and independently rotatable relative thereto, a range section countershaft gear (204) fixed for rotation with said auxiliary countershaft (78, 80), a range section output shaft gear (202) surrounding said output shaft and independently rotatable relative thereto, and a range section clutch (206) having a first selectable position for rotationally coupling said intermediate shaft to said output shaft and allowing said range section output gear to rotate independently of said output shaft, and second selectable position for rotationally coupling said range section output shaft gear to said output shaft and allowing independent rotation between said intermediate shaft and said output shaft;
• manually operated main section shifting means (72) for selectively moving said auxiliary jaw clutch assembly relative to said mainshaft;
• range section shifting means (210, 212) for selectively positioning said range section clutch in a selected one of the two selectable positions thereof;
• said control characterized by:
• first (58) and second (56) independent main section jaw clutch assemblies for selectively clutching the lowest main section speed ratio main section mainshaft gear (50) to said mainshaft and means (264) for sensing engagement and disengagement, respectively, of said lowest main section speed ratio mainshaft gear by one (56) of said main section jaw clutch assemblies to cause said range section shifting means to cause said range section clutch to move toward said second and first positions, respectively, there of.

A control for an extended range compound splitter type change gear transmission (10) comprising a housing (16) defining a multiple speed main transmission section (12) connected in series with a multiple speed auxiliary transmission section (14) connected in series with a multiple speed extended range section (15);

• said main transmission section (12) comprising an input shaft (18) having an input gear (22) rotationally fixed thereto, a mainshaft (28) generally coaxial with said input shaft in extending into said auxiliary transmission section, at least one countershaft (24, 26) rotationally supported in said housing and driven by said input gear, a plurality of countershaft gears (36, 38, 40, 42) fixed to said countershaft, a plurality of main section mainshaft gears (46, 48, 50) surrounding but not constantly engaged with said mainshaft and constantly driven by said countershaft gears, one of said main section mainshaft gears defining a low speed ratio main section mainshaft gear and another of said main section mainshaft gears defining a second lowest speed ratio main section mainshaft gear, and main section jaw clutch assemblies (56, 58, 60) for selectively clutching said input gear and main section mainshaft gears, one at a time, to said mainshaft;
• said extended range section (15) comprising a range section clutch (206) having a first selectable position for selecting a 1:1 ratio and second selectable position for selecting a speed reducing ratio;
• manually operated main section shifting means (72) for selectively moving said main section jaw clutch assemblies relative to said mainshaft;
• auxiliary section shifting means (144) for shifting said auxiliary transmission section;
• range section shifting means (210, 212) for selectively positioning said range section clutch in a selected one of the two selectable positions thereof;
• said control characterized by:
• first (58) and second (56) independent main section jaw clutch assemblies for selectively clutching the low speed ratio main section mainshaft gear (50) to said mainshaft and means (264) for sensing engagement and disengagement of said low speed ratio mainshaft gear by one (56) of said main section jaw clutch assemblies to cause said range section shifting means to cause said range section clutch to move toward said second and first positions, respectively, thereof.