Abstract: A power transmission system for a hybrid electric vehicle may include an input shaft to which a rotational power of an engine is input; a first motor/generator having a first motor shaft; a planetary gear set disposed on the first motor shaft of the first motor/generator and including a first rotation element fixedly connected to the first motor shaft, a second rotation element fixedly connected to the input shaft, and a third rotation element; a second motor/generator having a second motor shaft disposed; and an output shaft transmitting a rotational power transmitted from the planetary gear set and the second motor/generator to a differential apparatus, wherein the rotational driving force of the planetary gear set and the second motor/generator is transmitted to the output shaft by the first gear set and the rotational driving force of the output shaft is transmitted to the differential apparatus by the second gear set.

Abstract: A hybrid vehicle powertrain may include input shafts, clutches, output shafts, a transmission path selector, a planetary gear unit, and a gear stage forming mechanism. The transmission path selector may bring engagement of a first input shaft with second or third input shaft. The planetary gear unit may have three rotary elements, with motor power or engine power being input via a first or second rotary element and being output with any one of two transmission gear ratios under the control of first or third rotary element in response to engagement of first and second engaging units. The gear stage forming mechanism may be formed by engagement of gear pairs having different transmission gear ratios with second and third input shafts and a first output shaft, and function to transmit the power from the second or third input shaft to the first output shaft while changing a speed by selecting a gear pair in accordance with a vehicle running speed using a gear pair selector.

Abstract: A powertrain for a hybrid vehicle may include a first input shaft connected to a motor generator and coupled to a dog clutch apparatus, and a second input shaft connected to an engine and coupled to a planetary gear set, in which when the vehicle is overdriven, the dog clutch apparatus is engaged and restricts one component of the planetary gear set.

Abstract: A hybrid powertrain for a vehicle includes an input shaft rotating in response to a power received from an engine. output shaft is arranged parallel to the input shaft. A first motor generator is configured to transmit and receive a power to and from the output shaft. A second motor generator is configured to transmit and receive a power to and from the input shaft. A first clutch structure enables or disables transmission of the power between the first motor generator and the output shaft. A second clutch structure enables or disables transmission of the power between the input shaft and the output shaft. A third clutch structure enables or disables transmission of the power between the second motor generator and the input shaft.

Abstract: A power transmission system of a hybrid electric vehicle may include, a generating device adapted to generate electricity by torque of an engine or to start the engine. an input device adapted to receive the torque of the engine. a speed output device changing the torque transmitted from the input device into two speed steps and outputting the changed torque. an auxiliary power source disposed between the input device and the speed output device and adapted to supply torque to the speed output device or to generate electricity by the torque of the speed output device. a final reduction device outputting the torque transmitted from the speed output device.

Abstract: A hybrid power train for a vehicle is capable of improving fuel efficiency of the vehicle by preventing a motor from being driven by power of an engine for a period in which the vehicle is driven by the engine. The hybrid power train may include an input shaft installed to selectively receive power of an engine, an engine side driving gear provided at the input shaft, an output shaft disposed in parallel with the input shaft, an engine side driven gear provided at the output shaft so as to be engaged with the engine side driving gear, a motor side driving gear installed to be rotated by a motor while forming a concentric axis with the input shaft, a motor side driven gear rotatably provided at the output shaft so as to be engaged with the motor side driving gear, and a clutch unit installed to switch a state in which the motor side driven gear is fixed to the output shaft.

Abstract: A powertrain for a hybrid vehicle may include a first input shaft connected to a motor generator and coupled to a dog clutch apparatus, and a second input shaft connected to an engine and coupled to a planetary gear set, in which when the vehicle is overdriven, the dog clutch apparatus is engaged and restricts one component of the planetary gear set.

Abstract: A hybrid powertrain for a vehicle includes an input shaft rotating in response to a power received from an engine. output shaft is arranged parallel to the input shaft. A first motor generator is configured to transmit and receive a power to and from the output shaft. A second motor generator is configured to transmit and receive a power to and from the input shaft. A first clutch structure enables or disables transmission of the power between the first motor generator and the output shaft. A second clutch structure enables or disables transmission of the power between the input shaft and the output shaft. A third clutch structure enables or disables transmission of the power between the second motor generator and the input shaft.

Abstract: A hybrid transmission for a vehicle may include a first input shaft receiving power from an engine through a first clutch, a second input shaft disposed parallel to the first input shaft and receiving power from the engine through a path different from that of the first input shaft, a power control unit selectively transmitting the power of the first input shaft to the second input shaft, an output shaft disposed parallel to the first input shaft and the second input shaft, a common shift module including a plurality of shift gears and synchronous apparatuses to form any one shift stage, a motor connected to the first input shaft, and a planetary gear set having rotary elements connected to one shift gear on the first input shaft and the second input shaft, respectively, and another rotary element capable of changing a fixed state.

Abstract: A hybrid vehicle powertrain may include input shafts, clutches, output shafts, a transmission path selector, a planetary gear unit, and a gear stage forming mechanism. The transmission path selector may bring engagement of a first input shaft with second or third input shaft. The planetary gear unit may have three rotary elements, with motor power or engine power being input via a first or second rotary element and being output with any one of two transmission gear ratios under the control of first or third rotary element in response to engagement of first and second engaging units. The gear stage forming mechanism may be formed by engagement of gear pairs having different transmission gear ratios with second and third input shafts and a first output shaft, and function to transmit the power from the second or third input shaft to the first output shaft while changing a speed by selecting a gear pair in accordance with a vehicle running speed using a gear pair selector.

Abstract: A hybrid transmission for a vehicle may include a first input shaft receiving power from an engine through a first clutch, a second input shaft disposed parallel to the first input shaft and receiving power from the engine through a path different from that of the first input shaft, a power control unit selectively transmitting the power of the first input shaft to the second input shaft, an output shaft disposed parallel to the first input shaft and the second input shaft, a common shift module including a plurality of shift gears and synchronous apparatuses to form any one shift stage, a motor connected to the first input shaft, and a planetary gear set having rotary elements connected to one shift gear on the first input shaft and the second input shaft, respectively, and another rotary element capable of changing a fixed state.

Abstract: A power transmission system of a hybrid electric vehicle may include, a generating device adapted to generate electricity by torque of an engine or to start the engine. an input device adapted to receive the torque of the engine. a speed output device changing the torque transmitted from the input device into two speed steps and outputting the changed torque. an auxiliary power source disposed between the input device and the speed output device and adapted to supply torque to the speed output device or to generate electricity by the torque of the speed output device. a final reduction device outputting the torque transmitted from the speed output device.

Abstract: A hybrid power train for a vehicle is capable of improving fuel efficiency of the vehicle by preventing a motor from being driven by power of an engine for a period in which the vehicle is driven by the engine.