Patent ID: 8424403

Claim:
A multi-gear powershift transmission for a working machine with three forward gears and three reverse gears, the powershift transmission comprising: a torque converter ( 1 ), a driveshaft ( 2 ), a drive output shaft ( 17 ); first, second, third and fourth countershafts ( 7 , 12 , 22 , 24 ); first, second, third, fourth and fifth loose wheels ( 5 , 10 , 15 , 20 , 27 ); first, second, third, fourth, fifth, sixth and seventh fixed wheels ( 3 , 8 , 13 , 18 , 23 , 25 , 29 ); and reverse, forward, first, second and third clutches ( 4 , 9 , 14 , 19 , 26 ); wherein the first fixed wheel ( 3 ) is fixedly connected to the driveshaft ( 2 ) and the first fixed wheel ( 3 ) meshes with the second fixed wheel ( 8 ) of a forward-gear unit ( 6 ) which comprises the second fixed wheel ( 8 ), the forward clutch ( 9 ) and the second loose wheel ( 10 ), the first fixed wheel ( 3 ), the reverse clutch ( 4 ) and the first loose wheel ( 5 ) are arranged coaxially with the driveshaft ( 2 ) and together form a reverse-gear unit ( 11 ), the third fixed wheel ( 13 ) is fixedly connected to the second countershaft ( 12 ) and the third fixed wheel ( 13 ) meshes with the first loose wheel ( 5 ) arranged coaxially with the first fixed wheel ( 3 ) of the driveshaft ( 2 ) and with the second loose wheel ( 10 ) of the forward-gear unit ( 6 ), the third fixed wheel ( 13 ), the first clutch ( 14 ) and the third loose wheel ( 15 ) are arranged coaxially with the third fixed wheel ( 13 ) and together form a first gear-unit ( 16 ), the fourth fixed wheel ( 18 ) is fixedly connected to the third countershaft ( 22 ) and the fourth fixed wheel ( 18 ) meshes with the third loose wheel ( 15 ) of the first gear-unit ( 16 ), and the fourth fixed wheel ( 18 ) together with the fifth fixed wheel ( 23 ), the second clutch ( 19 ) and the fourth loose wheel ( 20 ) are all arranged coaxially with the third countershaft ( 22 ) and form a second gear-unit ( 21 ), the fourth loose wheel ( 20 ) of the second gear-unit ( 21 ) meshes with the third fixed wheel ( 13 ) of the first gear-unit ( 16 ), and the fifth fixed wheel ( 23 ) of the second gear-unit ( 21 ) meshes with the fifth loose wheel ( 27 ) of a third gear-unit ( 28 ), and the fourth loose wheel ( 20 ) of the second gear-unit ( 21 ) meshes with the sixth fixed wheel ( 25 ) of the third gear-unit ( 28 ), and the fifth loose wheel ( 27 ), the third clutch ( 26 ), the sixth fixed wheel ( 25 ) and the fourth countershaft ( 24 ) together form the third gear-unit ( 28 ), and the seventh fixed wheel ( 29 ) is fixedly connected to the drive output shaft ( 17 ), and the seventh fixed wheel ( 29 ) meshes with the fourth fixed wheel ( 18 ) of the second gear-unit ( 21 ).