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US 8,056,429 B2Granted
Multi-speed dual clutch transmission with countershaft gearing arrangement
AssigneeGM Global Technology Operations LLC
InventorsTejinder Singh, Henryk Sowul, James D. Hendrickson
Life of this patent
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Abstract
A transmission is provided having a dual clutch to achieve torque flow through a dual countershaft gearing arrangement. The countershaft gearing arrangement includes a plurality of co-planar gear sets having gears that are selectively connectable to a first countershaft and a second countershaft. A transfer gear set transfers torque from the countershafts to an output shaft.
Claims20
A transmission comprising:
- an input member;
- an output member;
- a first, second, third, fourth, and fifth gear set each having a first gear, a second gear, and a third gear wherein the output member is continuously connected with one of the gear sets;
- a first interconnecting member continuously connected to the third and fourth gear sets;
- a second interconnecting member continuously connected with the first and second gear sets;
- a first countershaft continuously connected to the fifth gear set;
- a second countershaft continuously connected to the fifth gear set;
- 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 each selectively coupling one of the first, second, third, and fourth gear sets with at least one of the first interconnecting member, the second interconnecting member, the first countershaft, and the second 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 and wherein the first gear, second gear, and third gear within each of the first, second, third, fourth, and fifth gear sets are co-planar.
8 more elements
A transmission comprising:
- an input member;
- an output member;
- a first, second, third, fourth, and fifth gear set each having a first gear, a second gear, and a third gear wherein the output member is continuously connected with one of the gear sets;
- a first interconnecting member continuously connected to the third and fourth gear sets;
- a second interconnecting member continuously connected with the first and second gear sets;
- a first countershaft continuously connected to the fifth gear set;
- a second countershaft continuously connected to the fifth gear set;
- a dual clutch assembly selectively engageable to interconnect the input member with one of the first interconnecting member and the second interconnecting member;
- a first synchronizer assembly selectively engageable to interconnect at least one of the first gear set and the second gear set to the first countershaft;
- a second synchronizer assembly selectively engageable to interconnect at least one of the first gear set and the second gear set to the second countershaft;
- a third synchronizer assembly selectively engageable to interconnect one of the third gear set and the fourth gear set to the first countershaft;
- and
- a fourth synchronizer assembly selectively engageable to interconnect one of the third gear set and the fourth gear set to the second countershaft,
- 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 and wherein the first gear, second gear, and third gear within each of the first, second, third, fourth, and fifth gear sets are co-planar.
11 more elements
A transmission comprising:
- an input member;
- an output member;
- a first, second, third, fourth, and fifth gear set each having a first gear, a second gear, and a third gear wherein the output member is continuously connected with the fifth gear set;
- a first interconnecting member continuously connected to the third and fourth gear sets;
- a second interconnecting member continuously connected with the first and second gear sets;
- a first countershaft continuously connected to the fifth gear set;
- a second countershaft continuously connected to the fifth gear set;
- a dual clutch assembly selectively engageable to interconnect the input member with one of the first interconnecting member and the second interconnecting member;
- a first synchronizer assembly selectively engageable to interconnect at least one of the first gear set and the second gear set to the first countershaft;
- a second synchronizer assembly selectively engageable to interconnect at least one of the first gear set and the second gear set to the second countershaft;
- a third synchronizer assembly selectively engageable to interconnect one of the third gear set and the fourth gear set to the first countershaft;
- and
- a fourth synchronizer assembly selectively engageable to interconnect one of the third gear set and the fourth gear set to the second countershaft,
- 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, and the fifth gear set is adjacent the fourth gear set, 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.
12 more elements
Dependencies are inferred from the claim text.