Abstract: A powertrain of a hybrid vehicle may include a planetary gear set, a first motor unit and a second motor unit. The planetary gear set may include three rotary members in which one rotary member is connected to an engine and another rotary member is connected to a front driveshaft. The first motor unit is connected to the remaining rotary member in the three rotary members, and the second motor unit is connected to a rear driveshaft and supplying power to the rear driveshaft.

Abstract: A power transmission system for a hybrid vehicle according to an exemplary embodiment of includes an input shaft through which torque from an engine, which is a power source, is inputted, first and second motor/generators that have the functions of both of a motor and a generator, as individual power sources, a planetary gear set that may be disposed on a line from the input shaft and includes a first rotating element directly connected with the first motor/generator and selectively connected to a transmission housing, a second rotating element directly connected with the input shaft and selectively connected to the transmission housing, and a third rotating element operating as an output element and connected with the second motor/generator, an output shaft that transmits torque from the planetary gear set and the second motor/generator to driving wheels through a differential, and a friction member disposed on the selective connecting portion.

Abstract: A power transmission system for a hybrid vehicle according to an exemplary embodiment of includes an input shaft through which torque from an engine, which is a power source, is inputted, first and second motor/generators that have the functions of both of a motor and a generator, as individual power sources, a planetary gear set that may be disposed on a line from the input shaft and includes a first rotating element directly connected with the first motor/generator and selectively connected to a transmission housing, a second rotating element directly connected with the input shaft and selectively connected to the transmission housing, and a third rotating element operating as an output element and connected with the second motor/generator, an output shaft that transmits torque from the planetary gear set and the second motor/generator to driving wheels through a differential, and a friction member disposed on the selective connecting portion.

Abstract: A transmission system of a hybrid electric vehicle may include two shafts, two hollow shafts and two motor/generators. A first shaft connected to an engine. A first hollow shaft disposed without rotational interference with the first shaft, selectively connected to the first shaft, and provided with a first output gear. A second hollow shaft disposed without rotational interference with the first hollow shaft and provided with a second output gear. A second shaft disposed in parallel with the first shaft and operably connected to the first shaft and the first hollow shaft through a gear unit to selectively transmit torque of the first shaft to the first hollow shaft. Clutches may connect the first shaft and the second shaft selectively to the first hollow shaft. A first motor/generator operably connected to the second hollow shaft and a second motor/generator operably connected to the second shaft.

Abstract: A power transmission device for a hybrid vehicle includes a series-parallel type power transmission path capable of varying an engine output for each driving mode, using a Ravigneaux gear train and two or more clutches, to improve the fuel efficiency of the hybrid vehicle. The power transmission device includes two or more kinds of engine fixing gear stages capable of distributing the output of the engine to a driving wheel, which are implemented using the Ravigneaux gear train, in which a single pinion planetary gear is integrally configured with a double pinion planetary gear including a carrier obtained by combining two pinion gears with the two or more clutches.

Abstract: A power transmission device for a hybrid vehicle includes a series-parallel type power transmission path capable of varying an engine output for each driving mode, using a Ravigneaux gear train and two or more clutches, to improve the fuel efficiency of the hybrid vehicle. The power transmission device includes two or more kinds of engine fixing gear stages capable of distributing the output of the engine to a driving wheel, which are implemented using the Ravigneaux gear train, in which a single pinion planetary gear is integrally configured with a double pinion planetary gear including a carrier obtained by combining two pinion gears with the two or more clutches.