A dual clutch transmission for motor vehicles has first and second input shafts, two clutches configured to selectively couple the input shafts to an engine, two intermediate shafts arranged parallel to the input shafts, gearwheel pairs of which a fixed gearwheel is arranged on one of the input shafts and a freely rotating gearwheel is arranged on one of the intermediate shafts, freely rotating output gearwheels arranged on each of the two intermediate shafts and meshing with a differential wheel, and coupling devices configured to selectively couple the freely rotating gearwheels to the respective intermediate shaft, of which at least the coupling devices for the output gearwheels are of double acting design. A dual clutch transmission of this kind makes a large number of gears possible without significantly increasing the dimensions of the transmission or the weight thereof.

A planetary gear train includes an input shaft, an output gear, first to third planetary gear sets respectively having first to third, fourth to sixth, and seventh to ninth rotation elements, a first shaft fixedly connected to the second rotation element and the input shaft, a second shaft fixedly connected to the sixth and eighth rotation elements and the output gear, a third shaft fixedly connected to the first rotation element and a transmission housing, a fourth shaft fixedly connected to the third rotation element, a fifth shaft fixedly connected to the fourth and seventh rotation elements, a sixth shaft fixedly connected to the fifth rotation element, and a seventh shaft fixedly connected to the ninth rotation element.

A multiple speed transmission includes an input shaft, an output shaft, a first planetary gearset having a first member, a second member, and a third member, and a second planetary gearset having an input member, a reaction member, a second member, and a third member. The transmission also includes a plurality of interconnecting members each connected between at least one of the first and second planetary gearsets and at least another of the first and second planetary gearsets. The transmission includes a plurality of torque-transmitting mechanisms which are selectively engageable in combinations of at least two to establish a plurality of forward speed ratios and a plurality of reverse speed ratios between the input shaft and the output shaft.

A plug-in hybrid powertrain for automotive vehicle is provided which has an internal combustion engine; an electric machine; multiple planetary gear sets, multiple selectively engageable clutch mechanisms and an output member. Selectively engaging those clutches will achieve multiple operation modes including multiple torque transfer ratio from electric machine to output member; multiple torque transfer ratio from internal combustion engine to output member; electric machine propulsion mode; internal combustion engine propulsion mode; generator assistant vehicle launch modes for forward and reverse in the internal combustion engine vehicle launch operations; motor assistant propulsion when in internal combustion engine vehicle propulsion operations; and engine cranking mode. The plug-in hybrid powertrain achieves more torque transfer ratios and operational mode with given number of planetary gear sets and clutches then any existing system.

A transmission arrangement for a vehicle includes a first, a second, a third, and a fourth planetary gear set including a sun gear, a planet carrier and a ring gear, respectively, wherein the transmission arrangement further includes a transmission housing, an input shaft and an output shaft, wherein the ring gear of the first planetary gear set and the input shaft are operatively connected to each other; the planet carrier of the first planetary gear set and the planet carrier of the second planetary gear set are operatively connected to each other; the sun gear of the first planetary gear set and the ring gear of the third planetary gear set are operatively connected to each other; the ring gear of the second planetary gear set and the planet carrier of the third planetary gear set are operatively connected to each other; the planet carrier of the third planetary gear set and the sun gear of the fourth planetary gear set are operatively connected to each other; and the planet carrier of the fourth planetary gear set and the output shaft are operatively connected each other.

A multi-stage transmission for a vehicle includes: a first planetary gear set and a second planetary gear set each including three rotating elements; a compound planetary gear set including four rotating elements; and eight rotation shafts connected to the rotating elements of the planetary gear sets.

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.

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.

An automatic transmission with housing, input shaft, output shaft, four planetary gear sets, and six shift elements. Second element of second planetary gear set forms first shaft; second element of third planetary gear set forms second shaft; first elements of first and second planetary gear sets form third shaft; third element of third planetary gear set forms fourth shaft; second element of first planetary gear set and third element of second planetary gear set form fifth shaft; third element of first planetary gear set forms sixth shaft; first elements of third and fourth planetary gear sets form seventh shaft; and third element of fourth planetary gear set forms eighth shaft. First shift element is between third shaft and housing; second shift element is between fourth shaft and housing; third shift element is between second and eighth shafts; fourth shift element is between fourth and fifth shafts; fifth shift element is between fifth and seventh shafts; sixth shift element is between sixth and seventh shafts.

A transmission for a vehicle capable is provided to improve fuel efficiency through multiple gear shift stages and enhance power performance of an engine. By combining first and second planetary gear sets, a compound planetary gear set, and multiple frictional elements selectively connecting rotary components of the three planetary gear sets via a corresponding shaft, the transmission provides eleven forward gear stages and three reverse gear stages. In particular, a first rotary element of the first planetary gear is fixedly connected to a transmission case, a second rotary element of the first planetary gear is fixedly connected to a second rotary element of the second planetary gear, and a third rotary element of the first planetary gear device is selectively connected to a first rotary element of the compound planetary gear set and a fourth rotary element of the compound planetary gear set.