Abstract: A power transmission apparatus for a vehicle is disclosed. The power transmission apparatus includes three concentric input shafts, a transmitting shaft disposed on the peripheral circumference of a first one of the three input shafts without rotation interference, and a central shaft disposed in parallel with the first input shaft. The power transmission apparatus further includes a fixed transmission selectively shifting an input torque depending on the respective gear ratios of three change gear trains disposed between second and third input shafts, the transmitting shaft, and the central shaft. The power transmission apparatus further includes a composite transmission including one planetary gear set having a sun gear fixedly connected to one side of the transmitting shaft.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft directly connected to a motor/generator, a second and third input shafts coaxial and selectively connectable to the first input shaft, a torque mediating shaft coaxial with the first input shaft, an intermediate shaft and output shaft disposed in parallel with the first input shaft, a first shifting section receiving torque from the third input shaft and outputting a modified torque to the torque mediating shaft, a second shifting section including first planetary gear set, shifting torque of the first input shaft to output the shifted torque to the torque mediating shaft, and selectively stopping the torque mediating shaft, and a third shifting section including second planetary gear set, forming an output torque in combination of torques from the first and second shifting sections and the second input shaft, and outputting the output torque to the output shaft.

Abstract: A planetary gear train of an automatic transmission for a vehicle may include: an input shaft receiving torque of an engine; an output shaft outputting torque and disposed in parallel with the input shaft; a compound planetary gear set having first, second, third, and fourth rotation elements and disposed at a radial external side of the input shaft; a simple planetary gear set having fifth, sixth, and seventh rotation elements and disposed at a radial external side of the output shaft; first to seventh shafts, each fixedly connected at least one among the first to seventh rotation elements; an eighth shaft selectively connectable to the input shaft; and two transfer gear sets operably connecting at least one shaft among the first to eighth shafts to another shaft.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft selectively connectable to an engine output shaft, a second input shaft coaxial and selectively connectable to the first input shaft, a torque mediating shaft coaxial with the first input shaft, a first intermediate shaft in parallel with the first input shaft, a compound shifting section including a first planetary gear set having a sun gear fixed to the torque mediating shaft, a planet carrier fixed to the second input shaft, and a ring gear and a second planetary gear set having a sun gear fixedly to the first intermediate shaft, a ring gear selectively connectable to a transmission housing, and a planet carrier for outputting a torque, and a fixed shifting section receiving a torque from the compound shifting section and outputting a modified torque to the second sun gear of the compound shifting section.

Abstract: A power transmission apparatus configured for a vehicle, may include a motor/generator including a motor shaft a first input shaft selectively connectable to the motor shaft, a second input shaft externally disposed with the first input shaft and selectively connectable to the motor shaft, a third input shaft externally disposed with the second input shaft and selectively connectable to the motor shaft, a first torque mediating shaft formed as a hollow shaft and coaxially and externally disposed with the first input shaft without rotational interference therebetween, an intermediate shaft parallel with the first input shaft, a first shifting section receiving a torque and outputting the shifted torque, and a second shifting section including a first planetary gear set selectively receiving the torques from the first shifting section and the third input shaft, respectively, and outputting shifted torque through one gear set.

Abstract: A power transmission apparatus configured for a vehicle may include a first input shaft fixedly connected to a motor/generator, a second input shaft selectively connectable to the first input shaft, a third input shaft selectively connectable to the first input shaft, a torque mediating shaft externally disposed with the first input shaft, an intermediate shaft, an idle shaft, an output shaft, a first shifting section selectively receiving a torque from the third input shaft, shifting the received torque and outputting the shifted torque, a second shifting section shifting a torque from the first input shaft to the torque mediating shaft, or stopping a rotation of the torque mediating shaft, and a third shifting section selectively receiving a torques from the first and second shifting sections and a torque from the second input and outputting shifted torque to the output shaft.

Abstract: A power transmission apparatus for a vehicle having an engine and a motor/generator includes: a first input shaft selectively connected with a motor/generator; second and third input shafts disposed coaxially with the first input shaft, and selectively connected with the motor/generator; a torque mediating shaft disposed coaxially with the second input shaft; an intermediate shaft in parallel with the first input shaft; an idle shaft in parallel with the first input shaft, and selectively connected with a transmission housing; a first shifting section including four gear sets, receiving torque through the first and second input shafts, and providing intermediate shift-stages; and a second shifting section including a planetary gear set, forming an output torque by combination of torques from the first shifting section and the third input shaft, and outputting the output torque to the output shaft.

Abstract: A power transmission apparatus for a vehicle having an engine and a motor/generator includes: a first input shaft selectively connected with a motor/generator; second and third input shafts disposed coaxially with the first input shaft, and selectively connected with the motor/generator; a torque mediating shaft disposed coaxially with the second input shaft; an intermediate shaft in parallel with the first input shaft; an idle shaft in parallel with the first input shaft, and selectively connected with a transmission housing; a first shifting section including four gear sets, receiving torque through the first and second input shafts, and providing intermediate shift-stages; and a second shifting section including a planetary gear set, forming an output torque by combination of torques from the first shifting section and the third input shaft, and outputting the output torque to the output shaft.

Abstract: A power transmission apparatus for a vehicle may include a first input shaft directly connected with a motor/generator, second and third input shafts and torque mediating shaft coaxial and selectively connected with the first input shaft, a first intermediate shaft and first and second idle shafts in parallel with the first input shaft, a second intermediate shaft in parallel with the first input shaft, and selectively connected with a transmission housing, an output shaft in parallel with the first input shaft, and coaxial and selectively connected with the second intermediate shaft, a first shifting section including six gear sets, selectively receiving torque through the first and third input shafts, and outputting intermediate shift-stages, and a second shifting section including a planetary gear set, forming an output torque by combination torques from the first shifting section and the second input shaft, and outputting the output torque to the output shaft.

Abstract: A power transmission apparatus for a vehicle may include: first, second, and third input shafts disposed coaxially with each other and each selectively connected with a motor/generator; a torque mediating shaft disposed coaxially with the first input shaft; a first intermediate shaft in parallel with the first input shaft; a second intermediate shaft in parallel with the first input shaft, and selectively connected with a transmission housing; a first shifting section including five gear sets, selectively receiving torques through the first and third input shafts, and providing intermediate shift-stages; and a second shifting section including a planetary gear set, forming an output torque by combination of torques from the first shifting section and the second input shaft, and outputting the output torque to the output shaft through one gear set.

Abstract: A power transmission apparatus for a vehicle having an engine and a motor/generator includes first to third input shafts each selectively connected with a motor shaft. A power mediating shaft is coaxially disposed with the first input shaft, and first and second intermediate shafts each are disposed in parallel with the first input shaft. The second intermediate shaft is selectively connected with a transmission housing, and an idle shaft is disposed in parallel with the first input shaft. A first shifting section includes six gear sets disposed on the above shafts and outputs a plurality of intermediate shift-stages shifted from torques received through the first and third input shafts. A second shifting section forms an output torque by combination of torques from the first shifting section and the second input shaft, and an output shaft outputs a torque received from the first and second shifting sections.

Abstract: A power transmission apparatus for a vehicle having an engine and a motor/generator includes first to third input shafts each selectively connected with a motor shaft. A power mediating shaft is coaxially disposed with the first input shaft, and first and second intermediate shafts each are disposed in parallel with the first input shaft. The second intermediate shaft is selectively connected with a transmission housing, and an idle shaft is disposed in parallel with the first input shaft. A first shifting section includes six gear sets disposed on the above shafts and outputs a plurality of intermediate shift-stages shifted from torques received through the first and third input shafts. A second shifting section forms an output torque by combination of torques from the first shifting section and the second input shaft, and an output shaft outputs a torque received from the first and second shifting sections.

Abstract: A power transmission apparatus includes a first input shaft selectively receiving an input torque, a second input shaft coaxially disposed with the first input shaft and selectively receiving the input torque, first and second intermediate shafts selectively interconnected and disposed in parallel with the first input shaft, a torque mediating shaft coaxially disposed with the first input shaft, a preliminary shifting section receiving a torque through a first input shaft and selectively outputting a shifted torque to the second intermediate shaft, a compound shifting section including a planetary gear set having a sun gear fixedly connected with the torque mediating shaft, a planet carrier fixedly connected with the second input shaft, and a ring gear externally gear-meshed with the second intermediate shaft, and an output shaft receiving a torque received from the compound shifting section and transmitting the received torque to a differential.

Abstract: A power transmission apparatus for a vehicle is disclosed. The power transmission apparatus includes a first input shaft selectively connected to an engine output shaft through a first clutch, a second input shaft configured as a hollow shaft that is disposed on the outer circumference of the first output shaft without rotational interference and selectively connected to the engine output shaft through a second clutch, a third input shaft configured as a hollow shaft that is disposed on the outer circumference of the second output shaft without rotational interference and selectively connected to the engine output shaft through a third clutch. The transmission apparatus further comprises an output shaft placed parallel to the first, second, and third input shafts at a certain distance.

Abstract: A power transmission apparatus includes: a first input shaft always receiving an input torque from an engine; second and third input shafts coaxially disposed and selectively connected with the first input shaft; a torque mediating shaft selectively connected with the first input shaft or a transmission housing; first and second intermediate shafts and an output shaft respectively disposed in parallel with the first input shaft; a first preliminary shifting section receiving a torque through a first input gear set, selectively shifting the received torque, and outputting the shifted torque; a second preliminary shifting section including a second shifting gear set which outputs a torque from the first input shaft and stops ;and a compound shifting section forming an output torque by the input torque and the first and second shifted torques.

Abstract: A power transmission apparatus includes a first input shaft receiving an input torque, second and third input shafts coaxially disposed and selectively connected with the first input shaft, first and second torque mediating shafts coaxially disposed with the first input shaft, first and second intermediate shafts and an output shaft disposed in parallel with the first input shaft, a first shifting section receiving a torque from the third input shaft and outputting a plurality of first shifted torques, a second shifting section including a first planetary gear set selectively connected with the first input shaft and outputting a plurality of second shifted torques, and a compound shifting section forming an output torque by the input torque and the first and second shifted torques.

Abstract: A power transmission apparatus for a vehicle includes: an engine output shaft; a first transmission outputting torque shifted to two shift stages to a central output shaft; and a second transmission outputting torque shifted to multiple shift stages. The second transmission includes: a first input shaft disposed on the same shaft line as that of the central output shaft; a second input shaft disposed on an outer circumference of the first input shaft a third input shaft disposed in parallel with the first and second input shafts; an idle shaft disposed in parallel with the first and second input shafts and spaced apart from the first and second input shafts; and an output shaft disposed in parallel with the first and third input shafts and the idle shaft between the first and third input shafts and the idle shaft.

Abstract: A planetary gear train may include input and output shafts a compound planetary gear set having first, second, third and fourth rotation elements by combination of first and second planetary gear sets; a third planetary gear set having fifth, sixth, and seventh rotation elements; a fourth planetary gear set having eighth, ninth, and tenth rotation elements, the first rotation element selectively connectable to the fifth rotation element and the tenth rotation element, respectively, the second rotation element and the tenth rotation element selectively connectable to the transmission housing, the third rotation element fixedly connected to the sixth rotation element, and fixedly connected to the input shaft, the fourth rotation element selectively connectable to the seventh shaft, the fifth rotation element fixedly connected to the eighth shaft, the seventh rotation element selectively connectable to the ninth shaft, the ninth rotation element fixedly connected to the output shaft.

Abstract: A planetary gear train may include input and output shafts, first to fourth planetary gear sets respectively having first to third, fourth to sixth, seventh to ninth, and tenth to twelfth elements, a first shaft connected to the second element and selectively connectable to the input shaft, a second shaft connected to the fourth element, selectively connectable to the input shaft and a transmission housing, a third shaft connected to the fifth and ninth element, selectively connectable to the input shaft and the transmission housing, a fourth shaft connected to the third and eleventh elements and the output shaft, a fifth shaft connected to the first, sixth, eighth, and tenth elements, a sixth shaft connected to the seventh element, and a seventh shaft connected to the twelfth element and selectively connectable to the transmission housing.

Abstract: A power transmission apparatus includes: a first input shaft; a second input shaft coaxially disposed with the first input shaft and selectively connected with the first input shaft; a third input shaft coaxially disposed with the second input shaft and selectively connected with the first input shaft; a first output shaft in parallel with the first input shaft; a second output shaft arranged in series to and selectively connected with the first output shaft; a first shift-stage shifting section outputting two shifted torques from the third input shaft to the first output shaft; a second shift-stage shifting section outputting one shifted torque and one reverse torque from the second input shaft to the first output shaft; and a compound shifting section outputting a shifted output torque from a received torque selectively from the first input shaft or the first output shaft.