Patent ID: 8499656
Filing Date: 2013-08-06
Classification: F16H,Y10T

Abstract:
1. A transmission comprising: a transmission housing; a dual clutch assembly having a first clutch, second clutch and a clutch housing connectable to an engine output member, wherein the clutch housing is rotationally supported within the transmission housing; a first, second, third, fourth, fifth and sixth gear set, wherein the first gear set includes a first gear, a second gear and a third gear, wherein the first gear is in mesh with the third gear and the second gear is in mesh with the third gear, the second gear set includes a first gear in mesh with a second gear and a third gear, the third gear set includes a first gear in mesh with a second gear and a third gear, the fourth gear set includes a first gear in mesh with a second gear, the fifth gear set includes a first gear in mesh with a second gear and the sixth gear set includes a first gear in mesh with a second gear and a third gear; a first transmission input member rotatably supported in the transmission housing and wherein each of the first gears of the fourth, fifth and sixth gear sets are rotatably fixed for common rotation with the first transmission input member and wherein the selective engagement of the first clutch of the dual clutch assembly transfers torque from the clutch housing to the first transmission input member; a second transmission input member rotatably supported in the transmission housing and wherein each of the first gears of the first, second and third gear sets are rotatably fixed for common rotation with the second transmission input member and wherein the second transmission input member is concentric with the first transmission input member and at least partially surrounds the first transmission input member and wherein the selective engagement of the second clutch of the dual clutch assembly transfers torque form the clutch housing to the second transmission input member; a first countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the first and second transmission input members, wherein the third gear of the first gear set, the third gear of the second gear set, the third gear of the third gear set, the second gear of the fourth gear set, the second gear of the fifth gear set and the third gear of the sixth gear set are each selectively connectable for common rotation with the first countershaft; a second countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the first and second transmission input members, wherein the second gear of the first gear set, the second gear of the second gear set, the second gear of the third gear set and the second gear of the sixth gear set are each selectively connectable for common rotation with the second countershaft; and six synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth, fifth and sixth gear sets with at least one of the first countershaft and the second countershaft, and wherein the selective engagement of the first and second clutches of the dual clutch assembly interconnects the dual clutch housing with at least one of the first and the second transmission input members and the selective engagement of at least one of the six synchronizer assemblies establishes at least one of eight forward speed ratios.