A first gear mechanism is connected to an input shaft. A second gear mechanism is connected to the input shaft. A motor is connected to the first gear mechanism and the second gear mechanism. The motor continuously varies a speed ratio of a first output gear with respect to the input shaft and a speed ratio of a second output gear with respect to the input shaft. A planetary gear mechanism includes a first rotation element, a second rotation element, and a third rotation element. The planetary gear mechanism is rotatable about a first transfer shaft. A first driven gear is rotatable about a second transfer shaft. The first output gear is connected to the first rotation element. The second output gear is connected to the second rotation element through the first driven gear. The output shaft is connected to the third rotation element.

A first gear mechanism is connected to an input shaft. A second gear mechanism is connected to the input shaft. A motor is connected to the first gear mechanism and the second gear mechanism. The motor continuously varies a speed ratio of a first output gear with respect to the input shaft and a speed ratio of a second output gear with respect to the input shaft. A planetary gear mechanism includes a first rotation element, a second rotation element, and a third rotation element. The planetary gear mechanism is rotatable about a first transfer shaft. A first driven gear is rotatable about a second transfer shaft. The first output gear is connected to the first rotation element. The second output gear is connected to the second rotation element through the first driven gear. The output shaft is connected to the third rotation element.

A transmission includes a drive element, a first output element, a primary transmission unit, a reversing unit, and an intermediate gearbox. At least three of the at least eight shifting elements of the primary transmission unit, at least one of the at least two shifting elements of the reversing unit, and at least one of the at least two shifting elements of the intermediate gearbox are activatable in combinations of at least five shifting elements so as to establish at least twenty-eight forward gears between the drive element and the first output element.

A vehicle transmission having a housing and a main transmission which includes input and output shafts and four planetary gearsets. Each of the gearsets has sun and ring gears, a carrier which supports a planetary gearwheel. The sun gear and the carrier of the second gearset are coupled permanently to the input and output shafts, respectively. The carrier of the second gearset is permanently coupled to the carrier of the fourth gearset. The ring gear of the second gearset is permanently coupled to the ring gear of the third gearset. The carrier of the fourth gearset can be coupled, via a first shifting element, to the sun gear of the second gearset. The carrier of the third gearset can be coupled, via a second shifting element, to the housing. The sun gear of the third gearset can be coupled, via third and fourth shifting elements, to the input shaft.

The present invention is a mechanical power transmission system without the use of a clutch. The system comprises of input planetary gear systems, output planetary gear systems, a stabilizing structure disposed between the input planetary gear systems and output planetary gear systems, and connecting shafts which transfer the mechanical power between the input planetary gears within the input planetary gear systems and the output planetary gears within the output planetary gear systems.

A motor vehicle group transmission with at least one housing, a main transmission and a range transmission connected downstream from the main transmission. The main transmission comprises at least four planetary gearsets, each of which comprises a sun gear, a carrier, a planetary gearwheel mounted on the carrier and a ring gear, and at least five shifting elements. The range transmission includes at least two planetary gearsets, each of which has a sun gear, a carrier, a planetary gearwheel mounted on the carrier and a ring gear, and at least three shifting elements. The main transmission and the range transmission, together in combination, provide at least thirteen forward gears and at least eight reverse gears.

A transmission includes a drive element, a first output element, a primary transmission unit, a reversing unit, and an intermediate gearbox. At least two of the at least nine shifting elements of the primary transmission unit, at least one of the at least two shifting elements of the reversing unit, and at least one of the at least two shifting elements of the intermediate gearbox are activatable in combinations of at least four shifting elements so as to establish at least twenty-eight forward gears between the drive element and the first output element.

A transmission includes a drive element, a first output element, a primary transmission unit, a reversing unit, and an intermediate gearbox. At least two of the at least five shifting elements of the primary transmission unit, at least one of the at least two shifting elements of the reversing unit, and at least one of the at least two shifting elements of the intermediate gearbox are activatable in combinations of at least four shifting elements so as to establish at least twelve forward gears between the drive element and the first output element.

A transmission includes a drive element, a first output element, a primary transmission unit, a reversing unit, and an intermediate gearbox. At least two of the at least five shifting elements of the primary transmission unit, at least one of the at least two shifting elements of the reversing unit, and at least one of the at least two shifting elements of the intermediate gearbox are activatable in combinations of at least four shifting elements so as to establish at least twelve forward gears between the drive element and the first output element.

A transmission includes a drive element, a first output element, a primary transmission unit, a reversing unit, and an intermediate gearbox. At least three of the at least seven shifting elements of the primary transmission unit, at least one of the at least two shifting elements of the reversing unit, and at least one of the at least two shifting elements of the intermediate gearbox are activatable in combinations of at least five shifting elements so as to establish at least eighteen forward gears between the drive element and the first output element.