Patent ID: 7837589
Filing Date: 2010-11-23
Classification: F16H

Abstract:
1. A transmission comprising: an input member; an output member; a first gearing arrangement including a first gear set, a second gear set, a third gear set, and a first countershaft, wherein the first gear set and the second gear set are selectively connectable to the first countershaft, wherein the third gear set is continuously interconnected to the first countershaft, and wherein the input member is continuously interconnected with the first gear set and the second gear set; a second gearing arrangement including the first gear set, the second gear set, the third gear set, a fourth gear set, and a second countershaft, wherein the first gear set, the second gear set, the third gear set, and the fourth gear set are selectively connectable to the second countershaft; a planetary gear set having a first member, a second member, and a third member; a first interconnecting member continuously interconnected to the third and fourth gear sets and to the first member of the planetary gear set; a second interconnecting member continuously interconnected to the third member of the planetary gear set; a clutch assembly selectively engageable to interconnect one of the first gear set and the second gear set with one of the first countershaft and the second countershaft; a synchronizer for selectively coupling one of the third and fourth gear sets with the second countershaft; three torque-transmitting devices each selectively engageable to interconnect at least one of the input member, first interconnecting member, and second interconnecting member with at least another of the input member, first interconnecting member, second interconnecting member, and a stationary element; and wherein the clutch assembly, torque-transmitting devices and synchronizer are selectively engageable in combinations of at least two to establish at least nine forward speed ratios and at least four reverse speed ratio between the input member and the output member.