Patent ID: 8668616
Filing Date: 2014-03-11
Classification: F16H

Abstract:
1. A transmission comprising: a dual clutch assembly having a first clutch, second clutch and a clutch housing connectable to an engine output member; a first, second, third, and fourth gear set each including a first gear in mesh with a second gear, wherein the fourth gear set includes a third gear in mesh with the first gear of the fourth gear set; a first transmission input member rotatably supported in the transmission housing wherein the first gears of the second and third gear sets are disposed on 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 wherein the first gear of the first gear set is disposed on 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 gear of the first gear set and the third gear of the fourth gear set are disposed on 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 gears of the second, third, and fourth gear sets are disposed on the second countershaft; an interconnecting member fixed for common rotation with the first gear of the fourth gear set; a first synchronizer assembly for selectively coupling at least one of the second gears with one of the first countershaft and the second countershaft; a compound planetary gear set including a first, second, third, fourth, fifth, and sixth member, wherein the first member is fixed for common rotation with the interconnecting member and the sixth member is fixed for common rotation with a transmission output member; and at least three torque transmitting devices each selectively connecting at least one of the first, second, third, fourth, fifth, and sixth members with at least one of a stationary member and the interconnecting member, 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 first synchronizer assembly and the torque transmitting devices establishes at least one of nine forward speed ratios and wherein the first member of the compound planetary gear set is a first sun gear, the second member is a second sun gear, the third member is a first planet gear meshed with the first sun gear, the fourth member is a second planet gear in mesh with the second sun gear and the first planet gear, the fifth member is a carrier member that supports the first and second planet gears, and the sixth member is a ring gear meshed with the second planet gear.