Dual clutch transmission
AssigneeEaton Cummins Automated Transmission Technologies, LLC
InventorsPaul Peterson, Matthew Busdiecker, Joseph Reynolds, James Walker, Thomas Stoltz
Life of this patent
Estimating the term…
Abstract
A dual clutch transmission includes a first and second concentric input shafts, a dual clutch assembly, a mainshaft coaxial with the first input shaft, a first countershaft, a second countershaft, and planetary range gearing with high and low ratios. The dual clutch transmission has six forward gear meshes and the high and low range ratios of the range gearing to provide ten forward gear ratios for the transmission. The transmission is powershiftable between consecutive gear ratios of the ten forward gear ratios such that no torque interrupt occurs during sequential shifts.
Claims18
A dual clutch transmission comprising:
- a first input shaft supporting first and second headset gear elements;
- a second input shaft concentric with the first input shaft and supporting third and fourth headset gear elements;
- a dual clutch assembly connected to the first and second input shafts;
- a mainshaft supporting first and second mainshaft gear elements, a first countershaft supporting a plurality of countershaft gear elements;
- a second countershaft supporting a plurality of countershaft gear elements;
- a range gearing having high and low ratios, the range gearing having a carrier and a ring gear cooperating with the mainshaft to form a planetary gearset;
- and an output shaft connected to the carrier of the range gearing for rotation therewith;
- wherein the first and second input shafts, the mainshaft, and the first and second countershafts provide six forward gear meshes for the transmission;
- wherein the six forward gear meshes and the high and low range ratios of the range gearing provide ten forward gear ratios for the transmission;
- and
- wherein the transmission is powershiftable between consecutive gear ratios of the ten forward gear ratios such that no torque interrupt occurs during sequential shifts.
A dual clutch transmission comprising:
- a dual clutch assembly;
- a first input shaft selectively driven by the dual clutch assembly;
- a second input shaft concentric with the first input shaft and selectively driven by the dual clutch assembly;
- a mainshaft;
- a first countershaft assembly having countershaft gear elements in meshed engagement with gear elements of the first input shaft, the second input shaft, and the mainshaft to provide five forward gear meshes;
- a second countershaft assembly having countershaft gear elements in meshed engagement with gear elements of the first input shaft, the second input shaft, and the mainshaft;
- a range gearing having high and low ratios, the range gearing having a carrier and a ring gear cooperating with the sun gear of the mainshaft;
- an output shaft connected to the carrier of the range gearing for rotation therewith;
- and
- wherein the transmission is powershiftable between ten consecutive forward gear ratios such that the transmission operates without torque interrupts during sequential increasing and decreasing forward shifts.
Dependencies are inferred from the claim text.