Multi-speed transmission

摘要

A transmission includes an input member, an output member, first and second transmission input shafts, first and second countershafts, a plurality of co-planar gear sets and a plurality of torque transmitting devices. The torque transmitting devices include a plurality of synchronizer assemblies and a dual clutch assembly. The transmission is operable to provide at least one reverse speed ratio and six forward speed ratios between the input member and the output member.

主权项

1. A transmission comprising:
a transmission housing; a first, second, third, fourth, fifth and sixth gear sets, wherein each of the gear sets include a first gear in mesh with a second gear and wherein the first gear set further includes a third gear in mesh with the second gear; a transmission input shaft member rotatably supported in the transmission housing and wherein the first gears of the first, third and fifth gear sets are rotatably fixed for common rotation with the transmission input shaft member and wherein the first gears of the second, fourth and sixth gear sets are selectively connectable for common rotation with the transmission input shaft member; a first countershaft rotatably supported within the transmission housing and spaced apart from and parallel with the transmission input shaft member, wherein each of the second gears of the second, fourth and sixth gear sets are rotatably fixed for common rotation with the countershaft and wherein the second gears of the first, third and fifth gear sets are 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 transmission input shaft member, wherein the third gear of the first gear set is selectively connectable for common rotation with the second countershaft; and seven synchronizer assemblies each 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 transmission input shaft member, the first countershaft and the second countershaft, and wherein the selective engagement of at least one of the seven synchronizer assemblies establishes at least one of six forward speed ratios and at least one reverse speed ratio.