Patent ID: 7669497
Filing Date: 2010-03-02
Classification: F16H,Y10T

Abstract:
1. A powertrain comprising: a power source; a transmission input member; a torque converter operatively connecting said power source and said transmission input member; first and second concentric intermediate shafts; first and second friction shifting clutches alternately selectively engagable for operatively connecting said transmission input member with said first and second intermediate shafts, respectively, first and second countershafts; a first input driving gear connected for common rotation with said first intermediate shaft and intermeshing with a first pair of driven input gears each connectable for rotation with a different respective one of said countershafts for selectively transferring torque to said different respective one of said countershafts when said first friction shifting clutch is engaged; a second input driving gear connected for common rotation with said second intermediate shaft and intermeshing with a second pair of driven input gears each connectable for common rotation with a different respective one of said countershafts for selectively transferring torque to said different respective one of said countershafts when said second friction shifting clutch is engaged; a third input driving gear connected for common rotation with said first intermediate shaft and continuously operatively connected with a third set of driven input gears each connectable for common rotation with a different respective one of said countershafts for selectively transferring torque to said different respective one of said countershafts when said first friction shifting clutch is engaged; and a fourth input driving gear connected for common rotation with said second intermediate shaft and continuously operatively connected with a fourth set of driven input gears each connectable for rotation with a different respective one of said countershafts for selectively transferring torque to said different respective one of said countershafts when said second friction shifting clutch is engaged.