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.

Abstract: A planetary gear train apparatus of an automatic transmission 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 fixed with the third element, and selectively connectable to the input shaft, a second shaft fixed with the fourth element, and selectively connectable to the input shaft, a third shaft fixed with the eleventh element and the output shaft, a fourth shaft fixed with the first, sixth, and ninth elements, a fifth shaft fixed with the seventh and twelfth elements, and shafts, each of which is selectively connectable to a housing and fixed to an element of the first to fourth gear sets which is not fixed with of the first to fifth shafts.

Abstract: A planetary gear train of an automatic transmission includes an input shaft for receiving an engine torque; an output shaft for outputting a torque; a first planetary gear set having first, second, and third rotational elements; a second planetary gear set having fourth, fifth, and sixth rotational elements; a third planetary gear set having seventh, eighth, and ninth rotational elements; and a fourth planetary gear set having tenth, eleventh, and twelfth rotational elements. The gear train further includes a first shaft and a second shaft each selectively connected with the input shaft; a third shaft fixedly connected with the output shaft; a fourth shaft fixedly connected with the first, sixth and eighth elements; a fifth shaft fixedly connected with the ninth and tenth elements; and a plurality of shafts, each selectively connected to the transmission housing and fixedly connected to one of the rotational elements of the planetary gear sets.

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; a direction changer disposed on an input shaft side and transmitting the torque of the engine to the input shaft with or without change of rotation direction, or disposed on an output shaft side and outputting the torque of the output shaft with or without change of rotation direction; a first planetary gear set including first, second and third rotation elements; a compound planetary gear set including fourth, fifth, sixth, and seventh rotation elements by combining second and third planetary gear sets; a fourth planetary gear set including eighth, ninth, and tenth rotation elements.

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 fifth and eighth elements, and selectively connectable to the input shaft, a second shaft connected to the tenth element, and selectively connectable to the input shaft, a third shaft connected to the ninth element the output shaft, a fourth shaft connected to the third and twelfth elements, a fifth shaft connected to the seventh and eleventh elements, and a plurality of shafts each selectively connecting a corresponding element to a transmission housing, the corresponding element being an element of the first and second planetary gear sets which is not interconnected.

Abstract: A planetary gear train of an automatic transmission for a vehicle may include an input shaft for receiving an engine torque, an output shaft for outputting a shifted torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, six control elements, a first connecting member directly connected with a transmission housing, a second connecting member selectively connectable with the transmission housing, a third connecting member selectively connectable with the input shaft, a fourth connecting member directly connected with the input shaft, a fifth connecting member selectively connectable with the transmission housing, a sixth connecting member selectively connectable with the input shaft, and selectively connectable with the transmission housing, a seventh connecting member directly connected with the output shaft, and an eighth connecting member selectively connectable with the input shaft.

Abstract: A planetary gear train may include first to third gear sets having three elements, respectively, the first and second gear sets mounted on input shaft, the third gear set mounted on output shaft, first shaft fixed to the first element and selectively connectable to the input shaft and housing, second shaft fixed to the second and sixth elements and selectively connectable to the input shaft and the housing, third shaft fixed to the third and fifth elements, fourth shaft fixed to the fourth element and selectively connectable to the housing, fifth shaft fixed to the seventh element and engaged with the third shaft, sixth shaft fixed to the eighth element and selectively connectable to the input shaft, seventh shaft fixed to the ninth element and the output shaft and selectively connectable to the fifth shaft, and two transfer gears each engaged between corresponding pair of shafts.

Abstract: A power transmission apparatus for a vehicle includes a first input shaft selectively connected with an engine output shaft through a first clutch; a second input shaft selectively connected to the engine output shaft through a second clutch; a third input shaft selectively connected to the engine output shaft through a third clutch; a power transmission shaft disposed about the external circumference of the second input shaft; first and second center shafts selectively connected with each other through a fourth clutch; an idle shaft disposed in parallel with the first input shaft; a fixed transmission for selectively shifting torque input to various shafts and outputting the torque through the second center shaft and the power transmission shaft; a composite transmission configured to complementarily composite shift and output input torque; and an output shaft outputting the torque transmitted from the composite transmission to a final reduction gear.

Abstract: A power transmission apparatus for a vehicle is disclosed. The power transmission apparatus includes three concentric input shafts, input shaft fixedly connected to an engine output shaft, a transmitting shaft disposed on the outer circumference of the first input shaft without rotation interference, a central shaft parallel to a first one of the input shafts and spaced apart from the first input shaft by a predetermined interval, a fixed transmission selectively shifting an input torque depending on the respective gear ratios of four change gear trains disposed between first and second input shafts, the transmitting shaft, and the central shaft and each having drive gears and driven gears externally connected to each other and outputting the shifted torque through the central shaft and the transmitting shaft, and composite transmission including a planetary gear set having a sun gear fixedly connected to one side of the transmitting 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 tenth, and eleventh to thirteenth elements, a first shaft connected to the second element and the input shaft, a second shaft connected to the twelfth element and the output shaft, a third shaft connected to the first and seventh elements, a fourth shaft connected to the eighth element, a fifth shaft connected to the ninth and eleventh element, a sixth shaft connected to the fifth and thirteenth elements, and a plurality of shafts each selectively connecting a corresponding element to a transmission housing, the corresponding element being an element of the first, second and third planetary gear sets which is not interconnected.

Abstract: A planetary gear train of an automatic transmission for a vehicle provides at least ten forward speed stages and one reverse speed stage by combination of: first to fourth planetary gear sets respectively having first to third rotation elements, fourth to sixth rotation elements, seventh to ninth rotation elements, or tenth to twelfth rotation elements; first to eighth shafts; at least four clutches and two brakes. In particular, the first shaft is fixedly connected to the first and fourth rotation elements and selectively connected to a transmission housing, the second shaft is fixedly connected to the second rotation element and an input shaft, the third shaft is fixedly connected to the fifth, eighth and twelfth rotation elements, the fourth shaft is fixedly connected to the ninth and tenth rotation elements and selectively connected to the input shaft.

Abstract: A planetary gear train may include: an input shaft an output shaft; first to fourth planetary gear sets including first to twelfth rotation elements; a first shaft fixedly connected to the second rotation element and the input shaft; a second shaft fixedly connected to the ninth and tenth rotation elements, and selectively connectable to the input shaft; a third shaft fixedly connected to the eleventh rotation element and the output shaft; a fourth shaft fixedly connected to the third rotation element; a fifth shaft fixedly connected to the fifth rotation element, the eighth rotation element, and the twelfth rotation element; a sixth shaft fixedly connected to the seventh rotation element; and a plurality of shafts formed by combinations of remaining rotation elements of the first and second planetary gear sets that are not connected to the first to sixth shafts, and selectively and respectively connected to a transmission housing.

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, four planetary gear sets, and eight shafts.

Abstract: Ten or more forward speeds and one or more reverse speed are achieved by a planetary gear train of an automatic transmission including four planetary gear sets. In particular, an input shaft is connected with fourth and seventh rotational elements, an output shaft is connected with a twelfth rotational element, second and fifth rotational elements are fixedly interconnected, third and eighth rotational elements are interconnected, and ninth and eleventh rotational elements are interconnected, the second, fourth, and tenth rotational elements are selectively interconnected, and eighth and twelfth rotational elements are selectively interconnected.

Abstract: A planetary gear train includes input and output shafts, and 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 is connected to the third element and selectively connected to the input shaft, a second shaft is connected to the ninth element and selectively connected to the input shaft, a third shaft is connected to the eleventh element and the output shaft, a fourth shaft is connected to the first, fourth, and seventh elements, and a fifth shaft is connected to the second and tenth elements. A plurality of shafts each selectively connect a corresponding element to a transmission housing, the corresponding element being an element of the second, third, and fourth planetary gear sets that is not interconnected.

Abstract: A transmission for a vehicle may include a first input shaft selectively connected to an engine through a first clutch, a second hollow input shaft disposed in a front side portion of the first input shaft and selectively connected to the engine through a second clutch, a continuously variable transmission mechanism (CV) that continuously shifts and outputs rotation power transferred from the first input shaft, a shift output mechanism that receives rotation power transferred from driving gears on the second input shaft and the CV through driven gears connected to an external gear and selectively shifts and outputs the rotation power, a reverse idle mechanism that transfers the rotation power of the first input shaft to the shift output mechanism in a reverse direction, and a final reduction mechanism that reduces the rotation power output from the shift output mechanism.

Abstract: A planetary gear train of an automatic transmission is disclosed. The planetary gear train comprises four planetary gear sets each including three rotation elements. The planetary gear train further comprises five shafts connecting at least one rotation member that are fixedly or operably connecting at least one rotation member to at least one from an input shaft of the transmission, an output shaft of the transmission, and the another rotation member of another planetary gear sets.

Abstract: A planetary gear train of an automatic transmission for a vehicle is disclosed and may include: an input shaft receiving torque of an engine; an output shaft outputting torque; a first, second, third and fourth planetary gear set, each having three rotation elements, together first-twelfth rotation elements; a first shaft fixedly connected to a second rotation element and selectively connected to the input shaft; a second shaft fixedly connected to a fourth rotation element and selectively connected to the input shaft; a third shaft fixedly connected to an eighth rotation element and a twelfth rotation element, and fixedly connected to the output shaft; a fourth shaft fixedly connected to a first rotation element, a fifth rotation element, and a ninth rotation element; a fifth shaft connected to a sixth rotation element and an eleventh rotation element; and a plurality of shafts selectively connected to a transmission housing.

Abstract: A planetary gear train may include input and output shafts, first to fourth planetary gear sets having first to third, fourth to sixth, seventh to ninth, and tenth to twelfth elements, a first shaft fixedly connected to the fourth and tenth elements, and selectively connectable to the input shaft, a second shaft fixedly connected to the third element, and selectively connectable to the input shaft, a third shaft fixedly connected to the eleventh element the output shaft, a fourth shaft fixedly connected to the first, sixth, and ninth elements, a fifth shaft fixedly connected to the eighth and twelfth elements, and a plurality of shafts each of which is selectively connectable to the transmission housing and fixedly connected to an element of the first, second and third planetary gear sets which is not fixedly connected to any of the first to seventh shafts.

Abstract: A planetary gear train of an automatic transmission is disclosed. The planetary gear train includes an input shaft receiving torque of an engine and an output shaft outputting torque. A first planetary gear set includes first, second, and third rotation elements, a second planetary gear set includes fourth, fifth, and sixth rotation elements, a third planetary gear set includes seventh, eighth, and ninth rotation elements, and a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements. Each of a first plurality of shafts is fixedly connected with one of the rotation elements from the first, the second, the third, and the fourth planetary gear sets. A second plurality of shafts is formed by combinations of remaining rotation elements of the first, the second, and the fourth planetary gear sets that are not connected to the first plurality of shafts, and selectively and respectively connected to a transmission housing.