Powertrain for an Automotive Vehicle with Multiple-Ratio Gearing and a Dual Power Input Clutch
AssigneeEaton Corporation
InventorGraeme A. Jackson
Life of this patent
Estimating the term…
Abstract
A multiple-ratio transmission with countershaft gearing with dual power input clutches. Ratio changes are made from each of several ratios to a preselected ratio by alternately engaging and disengaging the power input clutches. A robust bearing arrangement provides high torque transmitting capacity. An optimum number of transmission ratios are available with a minimum number of gear meshes.
Claims15
A multiple-ratio power transmission for an engine-powered vehicle comprising a mainshaft in a transmission housing connected drivably to a power output shaft, a first countershaft disposed parallel to the mainshaft and a second countershaft mounted concentrically about the first countershaft;
- first and second power input shafts, the first power input shaft being mounted concentrically about the second power input shaft;
- a headset gear assembly including first and second headset gears connected drivably to the first and second power input shafts, respectively;
- mainshaft gears in meshing engagement with countershaft gears to establish torque flow paths between the mainshaft and the power input shafts;
- the first headset gear being in meshing engagement with a countershaft gear for the first countershaft;
- the second headset gear being in meshing engagement with a countershaft gear for the second countershaft;
- a dual clutch assembly for alternately establishing and disestablishing a torque flow path from an engine to the first and second headset gears;
- first and second mainshaft bearings for end supporting the mainshaft within the housing;
- and
- a third mainshaft bearing disposed intermediate the first and second mainshaft bearings whereby the load capacity of mainshaft gears is improved.
A multiple-ratio power transmission for an engine-powered vehicle comprising a mainshaft in a transmission housing connected drivably to a power output shaft, a first countershaft disposed parallel to the mainshaft and a second countershaft mounted concentrically about the first countershaft;
- first and second power input shafts, the first power input shaft being mounted concentrically about the second power input shaft;
- a headset gear assembly including first and second headset gears connected drivably to the first and second power input shafts, respectively;
- mainshaft gears in meshing engagement with countershaft gears to establish torque flow paths between the mainshaft and the power input shafts;
- the first headset gear being in meshing engagement with a countershaft gear for the first countershaft;
- the second headset gear being in meshing engagement with a countershaft gear for the second countershaft;
- a dual clutch assembly for alternately establishing and disestablishing a torque flow path from an engine to the first and second headset gears;
- first and second countershaft bearings for end supporting the countershaft within the housing;
- a third countershaft bearing disposed intermediate the first and second countershaft bearings whereby the countershaft gear load capacity is improved.
A multiple-ratio power transmission for an engine-powered vehicle comprising a mainshaft in a transmission housing connected drivably to a power output shaft, a first countershaft disposed parallel to the mainshaft and a second countershaft mounted concentrically about the first countershaft;
- first and second power input shafts, the first power input shaft being mounted concentrically about the second power input shaft;
- a headset gear assembly including first and second headset gears connected drivably to the first and second power input shafts, respectively;
- the headset gear assembly including a first headset bearing rotatably supporting the second power input shaft and the second headset gear on the housing, a second headset bearing rotatably supporting the first power input shaft on the housing, and a third headset bearing intermediate the first and second headset bearings rotatably supporting the first power input shaft on the second power input shaft, whereby headset gearing loads are accommodated;
- mainshaft gears in meshing engagement with countershaft gears to establish torque flow paths between the mainshaft and the power input shafts;
- the first headset gear being in meshing engagement with a countershaft gear for the first countershaft;
- the second headset gear being in meshing engagement with a countershaft gear for the second countershaft;
- a dual clutch assembly for alternately establishing and disestablishing a torque flow path from an engine to the first and second headset gears;
- and
- multiple mainshaft bearings for supporting the mainshaft within the housing.
Dependencies are inferred from the claim text.