Seven speed dual clutch transmission having improved packaging
First Claim
1. A transmission comprising:
- a transmission housing;
a dual clutch assembly having a clutch housing connectable to a flywheel of an engine, wherein the clutch housing is rotationally supported within the transmission housing by a first ball bearing assembly;
a first, second, third, fourth, and fifth gear set, wherein the first gear set includes a first gear in mesh with a second gear and a third gear in mesh with the second gear, the second gear set includes a first gear in mesh with a second gear and a third gear, the third gear set includes a first gear in mesh with a second gear and a third gear, the fourth gear set includes a first gear in mesh with a second gear, the fifth gear set includes a first gear in mesh with a second gear;
a first transmission input member having a first end portion rotatably supported in the transmission housing by a second ball bearing assembly and a second end portion by a first needle bearing assembly, and wherein each of the first gear of the third, fourth and fifth gear set are rotatably fixed for common rotation with the first transmission input member;
a second transmission input member having a first end portion rotatably supported in the transmission housing by a second needle bearing assembly and a second end portion by a third ball bearing assembly, wherein the third ball bearing assembly is axially aligned and concentric with the first needle bearing assembly, wherein each of the first gear of the first and second gear sets are rotatably fixed for common rotation with the second transmission input member 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 by a first and second set of thrust bearings and spaced apart from and parallel with the first and second transmission input members, wherein the third gear of the first gear set, the third gear of the second gear set, the third gear of the third gear set and the second gear of the fourth gear set are each selectively connectable for common rotation with the first countershaft;
a second countershaft rotatably supported within the transmission housing by a third and fourth set of thrust bearings and spaced apart from and parallel with the first and second transmission input members, wherein the second gear of the first gear set and the second gear of the second gear set are each selectively connectable for common rotation with the second countershaft;
four synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth and fifth gear sets with at least one of the first transmission input member, the second transmission input member, the first countershaft and the second countershaft, andwherein the selective engagement of 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.
4 Assignments
0 Petitions
Accused Products
Abstract
A transmission connected to an engine input member and having an output transfer gear, first and second transmission input shaft members, first and second countershaft members, a plurality of co-planar gear sets, and a plurality of torque transmitting devices. The first and second transmission input shaft members are rotatably supported in the transmission housing by a combination of ball and needle bearings. The first and second countershaft members are rotatably supported in the transmission housing by plurality of thrust bearings. 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 a plurality of forward speed ratios between the input member and the output member.
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Citations
23 Claims
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1. A transmission comprising:
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a transmission housing; a dual clutch assembly having a clutch housing connectable to a flywheel of an engine, wherein the clutch housing is rotationally supported within the transmission housing by a first ball bearing assembly; a first, second, third, fourth, and fifth gear set, wherein the first gear set includes a first gear in mesh with a second gear and a third gear in mesh with the second gear, the second gear set includes a first gear in mesh with a second gear and a third gear, the third gear set includes a first gear in mesh with a second gear and a third gear, the fourth gear set includes a first gear in mesh with a second gear, the fifth gear set includes a first gear in mesh with a second gear; a first transmission input member having a first end portion rotatably supported in the transmission housing by a second ball bearing assembly and a second end portion by a first needle bearing assembly, and wherein each of the first gear of the third, fourth and fifth gear set are rotatably fixed for common rotation with the first transmission input member; a second transmission input member having a first end portion rotatably supported in the transmission housing by a second needle bearing assembly and a second end portion by a third ball bearing assembly, wherein the third ball bearing assembly is axially aligned and concentric with the first needle bearing assembly, wherein each of the first gear of the first and second gear sets are rotatably fixed for common rotation with the second transmission input member 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 by a first and second set of thrust bearings and spaced apart from and parallel with the first and second transmission input members, wherein the third gear of the first gear set, the third gear of the second gear set, the third gear of the third gear set and the second gear of the fourth gear set are each selectively connectable for common rotation with the first countershaft; a second countershaft rotatably supported within the transmission housing by a third and fourth set of thrust bearings and spaced apart from and parallel with the first and second transmission input members, wherein the second gear of the first gear set and the second gear of the second gear set are each selectively connectable for common rotation with the second countershaft; four synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth and fifth gear sets with at least one of the first transmission input member, the second transmission input member, the first countershaft and the second countershaft, and wherein the selective engagement of 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A transmission comprising:
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a transmission housing; a dual clutch assembly having a clutch housing connectable to a flywheel of an engine, wherein the clutch housing is rotationally supported within the transmission housing by a first ball bearing assembly; a first, second, third, fourth, and fifth gear set, wherein the first gear set includes a first gear in mesh with a first portion of second gear and a third gear in mesh with a second portion of the second gear, the second gear set includes a first gear in mesh with a second gear and a third gear, the third gear set includes a first gear in mesh with a second gear and a third gear, the fourth gear set includes a first gear in mesh with a second gear, the fifth gear set includes a first gear in mesh with a second gear; a first transmission input member having a first end portion rotatably supported in the transmission housing by a second ball bearing assembly and a second end portion by a first needle bearing assembly, wherein the first needle bearing assembly is disposed adjacent a second end wall of the transmission housing proximate to the dual clutch assembly, and wherein each of the first gear of the third, fourth and fifth gear set are rotatably fixed for common rotation with the first transmission input member and wherein the second ball bearing assembly is adjacent a first end wall of the transmission housing; a second transmission input member having a first end portion rotatably supported in the transmission housing by a second needle bearing assembly and a second end portion by a third ball bearing assembly, wherein the second needle bearing assembly is disposed between the second ball bearing assembly and the third ball bearing assembly, and wherein the third ball bearing assembly is axially aligned and concentric with the first needle bearing assembly, wherein each of the first gear of the first and second gear sets are rotatably fixed for common rotation with the second transmission input member 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 by a first and second set of thrust bearings and spaced apart from and parallel with the first and second transmission input members, wherein the third gear of the first gear set, the third gear of the second gear set, the third gear of the third gear set and the second gear of the fourth gear set are each selectively connectable for common rotation with the first countershaft; a second countershaft rotatably supported within the transmission housing by a third and fourth set of thrust bearings and spaced apart from and parallel with the first and second transmission input members, wherein the second gear of the first gear set and the second gear of the second gear set are each selectively connectable for common rotation with the second countershaft; four synchronizer assemblies for selectively coupling at least one of the gears of the first, second, third, fourth and fifth gear sets with at least one of the first transmission input member, the second transmission input member, the first countershaft and the second countershaft, and wherein the selective engagement of 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.
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Specification