Abstract: A transmission system that includes a multi-speed gearbox. The multi-speed gearbox, in one example, includes a primary shaft with a first set of gears positioned thereon, a secondary shaft with a second set of gears positioned thereon, an internal combustion engine (ICE) clutch configured to selectively couple an ICE to the primary shaft, and an electric drive interface gear that is positioned axially between two gears in the first set of gears, configured to couple to an electric machine, and coupled to a gear in the second set of gears.

Abstract: A transmission system is that includes a multi-speed gearbox. The multi-speed gearbox, in one example, includes a dual-clutch assembly configured to selectively engage a primary shaft and/or a second primary shaft and an electric drive clutch configured to selectively engage an electric drive interface gear, wherein the electric drive interface gear is positioned axially between two gears on the first or second primary shafts. The transmission system further includes a controller including instructions that when executed, during a first operating condition, cause the controller to operate the dual-clutch assembly to transfer mechanical power between an internal combustion engine (ICE) and the first primary shaft or the second primary shaft or operate the electric drive clutch to transfer mechanical power between an electric machine and the first primary shaft, the second primary shaft, or a secondary shaft.

Abstract: A hybrid transmission system with a multi-speed gearbox. The multi-speed gearbox, in one example, includes a first primary shaft with a first set of gears positioned thereon and selectively coupled to an internal combustion engine (ICE) at a first end and a second primary shaft with a second set of gears positioned thereon. The gearbox further includes a secondary shaft with a third set of gears that mesh with the first set of gear and the second set of gears and an electric drive interface gear that is idly mounted, free to spin, on the second primary shaft, positioned between two gears in the second set of gears, and configured to receive mechanical power from an electric machine and an output shaft that is configured to mechanically attached to a differential.

Abstract: A hybrid transmission system with a multi-speed gearbox. The multi-speed gearbox is configured to rotationally couple a prime mover and an electric machine to different gear ratios during a hybrid drive mode. The multi-speed gearbox includes an electric drive interface gear positioned coaxial to a first primary shaft and a second primary shaft and idly mounted, free to spin, to the second primary shaft and an output shaft that includes an output shaft gear which is fixedly coupled thereto meshes with a gear on a secondary shaft.

Abstract: A transmission system is provided that includes a mechanical reverse assembly designed to selectively mechanically couple a reverse gearset to an output shaft of an electric machine and a first primary shaft. In the mechanical reverse assembly, a coupling device may be automatically shifted to attach the reverse gearset to the first primary shaft in a reverse drive configuration in any of a hybrid mode, a full electric vehicle (EV) mode, and a full internal combustion engine (ICE) mode.

Abstract: A synchronizer may have a hub, an engagement sleeve, a pair of engagement ring gears, a pair of synchronizing rings and a pre-synchronizing system interposed between the hub and the engagement sleeve. The pre-synchronizing system may have a single elastic ring which is axially interposed between the synchronizing rings, is drivingly connected with the engagement sleeve in the axial sliding movement relative to the hub and is at least partially received in an internal annular groove of the engagement sleeve.

Abstract: A synchronizer may have a hub, an engagement sleeve, a pair of engagement ring gears, a pair of synchronizing rings and a pre-synchronizing system interposed between the hub and the engagement sleeve. The pre-synchronizing system may have a single elastic ring which is axially interposed between the synchronizing rings, is drivingly connected with the engagement sleeve in the axial sliding movement relative to the hub and is at least partially received in an internal annular groove of the engagement sleeve.