Patent ID: 7454991

Claim:
A shiftable multispeed reverse transmission comprising an input shaft ( 1 ) and first, second, third, fourth, fifth, sixth countershafts ( 2 , 3 , 4 , 5 , 6 , 7 ), one or more fixed gears and idle gears being mounted on the first, the second, the third, the fourth, the fifth, the sixth countershafts ( 2 , 3 , 4 , 5 , 6 , 7 ), the idle gears being non-rotatably connected with the countershafts via shiftable clutches for one of gear or direction change, and an output shaft ( 8 ), the reverse transmission has first, second, third and fourth forward gears and first, second, third and fourth reverse gears, a first fixed gear ( 116 ) and a first idle gear ( 115 ) connected with the input shaft ( 1 ) via a first forward clutch (KV) for the four forward gears, the first fixed gear ( 116 ) on the input shaft ( 1 ) being in constant mesh with a second fixed gear ( 202 ) on the first countershaft ( 2 ) upon which a reverse clutch (KR) is situated, a second idle gear ( 102 ) is connectable via the reverse clutch (KR) with the first countershaft ( 2 ) and is in constant mesh with a third fixed gear ( 104 ), the third fixed gear ( 104 ) is additionally in constant mesh with the first idle gear ( 115 ) situated upon the input shaft ( 1 ) and non-rotatably connected with the third countershaft ( 4 ) upon which are situated a fourth fixed gear ( 204 ) and a third idle gear ( 111 ), the third idle gear ( 111 ) is connectable via a third clutch (K 2 ) for gear change and in constant mesh with a fifth fixed gear ( 106 ) situated upon the fifth countershaft ( 6 ), and the fourth fixed gear ( 204 ) is in constant mesh with a fourth idle gear ( 113 ) situated on the fifth countershaft ( 6 ) which is capable of being connected via a fourth shiftable clutch (K 4 ), with the fifth countershaft ( 6 ), the fifth fixed gear ( 106 ) situated on the fifth countershaft ( 6 ) being in constant mesh with a sixth fixed gear ( 107 ) and the sixth fixed gear ( 107 ) being non-rotatably connected with the sixth countershaft ( 7 ) and a sun gear (S) of a planetary stage (P), and the output shaft ( 8 ) is non-rotatably connected with a seventh fixed gear ( 108 ) which is in constant mesh with a fifth idle gear ( 117 ), the fifth idle gear ( 117 ) being non-rotatably connected with a planet carrier of the planetary stage (P), a hollow shaft of the planetary stage (P) being connectable either, via a brake (B), with a housing (G) or, via a fifth clutch (K), with the sun gear (S).