Patent ID: 7225696
Filing Date: 2007-06-05
Classification: F16H,Y10T

Abstract:
1. A double clutch transmission including an input shaft ( 3 ), a central intermediate shaft ( 4 ) and a concentric intermediate shaft ( 5 ) disposed around the central intermediate shaft ( 4 ), first and second load clutches (K 1 and K 2 ) mounted on the input shaft ( 3 ) for selectively engaging the central intermediate shaft ( 4 ) and, respectively, the concentric intermediate shaft ( 5 ) for rotation with the input shaft ( 3 ), first and second jackshafts ( 14 , 15 ) arranged in spaced parallel relationship from the intermediate shafts ( 4 , 5 ), each of the intermediate shafts ( 4 , 5 ) carrying fixed gears and the jackshafts ( 14 , 15 ) carrying rotatable gears forming gear structures which can be selectively engaged with the jackshafts ( 14 , 15 ) to provide gear stages for various power transmission ratios, each of the central and the concentric intermediate shafts having one fixed gear ( 33 , 27 ) each of which is used for forming two gear stages that is, a largest fixed gear ( 33 ) of the central intermediate shaft ( 4 ) meshes with an end output gear ( 34 ) on the first jackshaft ( 14 ) and a jackshaft end output gear ( 35 ) on the second jackshaft ( 15 ), and a smallest fixed gear ( 27 ) of the concentric intermediate shaft ( 5 ) forming a forward gear structure with a second largest gear ( 16 ) on the first jackshaft ( 14 ) and one of fixed reversing gears on a third jackshaft ( 18 ) for forming a reverse simple transmission gear stage (R), said reverse simple transmission gear stage (R) including a first fixed reversing gear ( 17 ) mounted on the third jackshaft ( 18 ) and disposed in engagement with, and in the same transmission plane ( 29 ) as, the smallest fixed gear ( 27 ) of the concentric intermediate shaft ( 5 ) and a second fixed reversing gear ( 19 ) supported on the third jackshaft ( 18 ) and being in engagement with a reversing output gear ( 20 ) disposed on the second jackshaft ( 15 ) in another gear plane ( 32 ), said transmission further including transmission gear structures for first and second forward gears comprising a smallest gear ( 30 ) on the intermediate shaft ( 4 ) in engagement with a largest rotatable gear ( 31 ) on the first jackshaft ( 14 ) (first forward gear) and the smallest fixed gear ( 27 ) on the concentric intermediate shaft ( 5 ) in engagement with the second largest gear ( 16 ) on the first jackshaft ( 14 ) (second forward gear), the gear structures for the first and second forward gears being in the same gear plane ( 29 , 32 ) as the first fixed reversing gear ( 17 ) and respectively, the second fixed reversing gear ( 19 ) supported on the third jackshaft ( 18 ).