Patent ID: 7669494

Claim:
A range-change transmission comprising: an input shaft ( 4 ); a gearshift sleeve ( 42 ), having radially outer teeth ( 48 ), being rotationally fixed to and axially slidable along an end of the input shaft ( 4 ) between at least first and second positions; a first counter shaft ( 12 ) and a second counter shaft ( 14 ) each having a first gear wheel ( 8 , 10 ) and a second gear wheel ( 16 , 18 ) integrally formed therewith, each of the first and the second gear wheels ( 8 , 10 , 16 , 18 ) having helical teeth; a loose gear wheel ( 6 ), having radially inner teeth ( 44 ) and radially outer teeth, being rotationally supported by the input shaft ( 4 ), the loose gear wheel ( 6 ) engages the first gear wheel ( 8 , 10 ) of the first counter shaft ( 12 ) and a second counter shaft ( 14 ), respectively; a drive output shaft ( 22 ) being coaxially aligned with the input shaft ( 4 ), and the drive output shaft ( 22 ) having radially inner teeth ( 46 ) at an end located adjacent the input shaft ( 4 ); an output gear wheel ( 20 ) being integrally formed with the drive output shaft ( 22 ) and having helical teeth, and the output gear wheel ( 20 ) engages the second gear wheels ( 16 , 18 ) of the first counter shaft ( 12 ) and the second counter shaft ( 14 ); first and second pressure combs ( 50 , 52 ), being secured to and solely carried by opposite sides of the output gear wheel ( 20 ), maintain the output gear wheel ( 20 ) in axial alignment with the second gear wheels ( 16 , 18 ) of the first and the second counter shafts ( 12 , 14 ); and, an exterior surface of the first and the second counter shafts at a first axial end is radially supported on a housing by a first bearing and the exterior surface of the first and the second counter shafts at second axial end is radially supported by a second bearing.