Back to results
US 8,011,261 B2Granted
Multi-speed transmission with countershaft gearing arrangement
AssigneeGM Global Technology Operations LLC
InventorsJohn A. Diemer, James D. Hendrickson, Patrick S. Portell, Henryk Sowul
Life of this patent
Estimating the term…
Abstract
A transmission is provided having a dual clutch to achieve torque flow through a countershaft gearing arrangement. The countershaft gearing arrangement includes a plurality of co-planar gear sets having gears that are selectively connectable to a countershaft. A transfer gear set transfers torque from the countershaft to an output shaft. The output shaft is connected to a final drive unit that has a final drive unit output shaft that is transverse to an input member connected at one end to a torque converter and at the other end to the dual clutch.
Claims25
A transmission comprising:
- an input member;
- a torque converter continuously connected with the input member;
- an output member;
- a first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth gear set each having a first gear and a second gear, wherein the output member is continuously connected with one of the gear sets;
- a first interconnecting member continuously connected to the eighth and ninth gear sets;
- a second interconnecting member continuously connected with the third and fourth gear sets;
- a countershaft continuously connected to the first, second, fifth, sixth, and seventh gear sets;
- a dual clutch assembly selectively engageable to interconnect the input member with one of the first interconnecting member and the second interconnecting member;
- and
- four synchronizer assemblies for selectively coupling one of the first, second, third, fourth, sixth, seventh, eighth, and ninth gear sets with one of the first interconnecting member, second interconnecting member, and the countershaft, and
- wherein the dual clutch assembly and four synchronizer assemblies are selectively engageable in combinations of at least two to establish at least seven forward speed ratios and at least one reverse speed ratio between the input member and the output member.
8 more elements
A transmission comprising:
- an input member;
- an output member;
- a first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth gear set each having a first gear and a second gear, wherein the output member is continuously connected with one of the gear sets, and wherein the first gear set is adjacent the dual clutch assembly, the second gear set is adjacent the first gear set, the third gear set is adjacent the second gear set, the fourth gear set is adjacent the third gear set, the fifth gear set is adjacent the fourth gear set, the sixth gear set is adjacent the fifth gear set, the seventh gear set is adjacent the sixth gear set, the eighth gear set is adjacent the seventh gear set, and the ninth gear set is adjacent the eighth gear set;
- a first interconnecting member continuously connected to the eighth and ninth gear sets;
- a second interconnecting member continuously connected with the third and fourth gear sets;
- a countershaft continuously connected to the first, second, fifth, sixth, and seventh gear sets;
- a dual clutch assembly selectively engageable to interconnect the input member with one of the second interconnecting member and the first end of the first interconnecting member;
- a first synchronizer assembly selectively engageable to interconnect one of the first gear set and the second gear set to the second interconnecting member;
- a second synchronizer assembly selectively engageable to interconnect one of the third gear set and the fourth gear set to the countershaft;
- a third synchronizer assembly selectively engageable to interconnect one of the sixth gear set and the seventh gear set to the first interconnecting member;
- and
- a fourth synchronizer assembly selectively engageable to interconnect one of the eighth gear set and the ninth gear set to the countershaft, and
- wherein the dual clutch assembly and the first, second, third, and fourth synchronizer assemblies are selectively engageable in combinations of at least two to establish at least seven forward speed ratios and at least one reverse speed ratio between the input member and the output member.
10 more elements
A transmission comprising:
- an input member;
- an output member;
- a first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth gear set each having a first gear and a second gear, wherein the output member is continuously connected with one of the gear sets, and wherein the first gear set is adjacent the dual clutch assembly, the second gear set is adjacent the first gear set, the fourth gear set is adjacent the second gear set, the third gear set is adjacent the fourth gear set, the fifth gear set is adjacent the third gear set, the sixth gear set is adjacent the fifth gear set, the seventh gear set is adjacent the sixth gear set, the ninth gear set is adjacent the seventh gear set, and the eighth gear set is adjacent the ninth gear set
- a first interconnecting member continuously connected to the eighth and ninth gear;
- a second interconnecting member continuously connected with the third and fourth gear sets;
- a countershaft continuously connected to the first, second, fifth, sixth, and seventh gear sets;
- a dual clutch assembly selectively engageable to interconnect the input member with one of the second interconnecting member and the first interconnecting member;
- a first synchronizer assembly selectively engageable to interconnect one of the first gear set and the second gear set to the second interconnecting member;
- a second synchronizer assembly selectively engageable to interconnect one of the third gear set and the fourth gear set to the countershaft;
- a third synchronizer assembly selectively engageable to interconnect one of the sixth gear set and the seventh gear set to the first interconnecting member;
- and
- a fourth synchronizer assembly selectively engageable to interconnect one of the eighth gear set and the ninth gear set to the countershaft, and
- wherein the dual clutch assembly and the first, second, third, and fourth synchronizer assemblies are selectively engageable in combinations of at least two to establish at least seven forward speed ratios and at least one reverse speed ratio between the input member and the output member.
10 more elements
Dependencies are inferred from the claim text.