Patent ID: 8789434
Filing Date: 2014-07-29
Classification: F16D,F16H,Y10T

Abstract:
1. A powertrain comprising: an engine output member; a transmission housing; a dual clutch assembly having a clutch housing connected to the engine output member, wherein the clutch housing is rotationally supported within the transmission housing; a first transmission input member rotatably supported in the transmission housing, a second transmission input member rotatably supported in the transmission housing 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; a first countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the first and second transmission input members; a second countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the first and second transmission input members; a reverse gear selectively connectable for common rotation to the first countershaft; a first co-planar gear set having a first gear and a second gear, wherein the first gear is directly connected for common rotation with the second transmission input member and the second gear is selectively connectable for common rotation to the second countershaft, wherein the second gear includes a first gear teeth portion and a second gear teeth portion and a diameter of the first gear teeth portion is larger than a diameter of the second gear teeth portion, and wherein the first gear teeth portion meshes with the first gear of the first gear set and the second gear teeth portion meshes with the reverse gear; a plurality of co-planar gear sets interconnected between the first and second transmission input shafts and the first and second countershafts; and four synchronizer assemblies for selectively coupling at least one of the co-planar gear sets with at least one of the first countershaft and the second countershaft, and wherein the selective engagement 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 four synchronizer assemblies establishes at least one of seven forward speed ratios.