Patent ID: 8438941
Filing Date: 2013-05-14
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, sixth, seventh, and eighth gear set, wherein the first gear set includes a first gear in mesh with a second gear, the second gear set includes a first gear in mesh with a second gear, the third gear set includes a first gear in mesh with a second 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, the sixth gear set includes a first gear in mesh with a second gear, the seventh gear set includes a first gear in mesh with a second gear, and the eighth gear set includes a first gear in mesh with a second gear; a first transmission input member rotatably supported in the transmission housing and wherein each of the first gears of the fifth, sixth, seventh, and eighth 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, third, and fourth 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 from 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 second gears of the first, second, third, fourth, fifth, sixth, seventh, and eighth 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 countershaft supports a reverse gear that is meshed with one of the second gears of the first, second, third, fourth, fifth, sixth, seventh, and eighth gear sets; and five synchronizer assemblies each for selectively coupling at least one of the gears of the first, second, third, fourth, fifth, sixth, seventh, and eighth gear sets and the reverse gear 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 five synchronizer assemblies establishes at least one of eight forward speed ratios.