Patent ID: 7587957
Filing Date: 2009-09-15
Classification: F16H,Y10T

Abstract:
1. A multiple ratio power transmission for an automotive vehicle powertrain comprising a pair of power input shafts and a power output mainshaft; a pair of headset gears, a first of the headset gears being connected to a first of the input shafts and a second of the headset gears being connected to a second of the input shafts; first and second countershafts on a common countershaft axis, gear elements disposed on the countershaft axis; the first headset gear drivably engaging a first of the countershaft gear elements and the second headset gear drivably engaging a second of the countershaft gear elements; mainshaft gears disposed on a mainshaft axis; the first countershaft gear element being connected to the first countershaft and the second countershaft gear element being connected to the second countershaft; and mainshaft ratio change clutches on the mainshaft axis for selectively establishing driving connections between the mainshaft gears and the mainshaft; a countershaft ratio change clutch on the countershaft axis selectively connecting the first and second countershafts, and at least one mainshaft ratio change clutch selectively connecting one of the mainshaft gears to the mainshaft, the one mainshaft gear engaging a third of the countershaft gear elements whereby a low powertrain ratio is established as a first powertrain ratio is pre-selected.