Abstract: A multi-stage transmission for a vehicle includes an input shaft, an output shaft, first to fourth planetary gear devices disposed between the input shaft and the output shaft to transmit rotary forces and each of them having three rotary elements, and at least six shifting elements connected to the rotary elements of the planetary gear devices. Of the first planetary gear device, the first rotary element is permanently connected to the input shaft and a second rotary element of the third planetary gear device, a second rotary element is installed to be fixable by any one of the shifting elements and variably connected to a first rotary element of the second planetary gear device, and a third rotary element of the first planetary gear device is permanently connected to a second rotary element and variably connected to a first rotary element of the fourth planetary gear device.

Abstract: A transmission for a vehicle includes: a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set each including three rotary elements; and a plurality of friction members for controlling rotation of the rotary elements. The transmission improves fuel efficiency by implementing multiple steps of shifting and improves vehicle driving comfort by using operating points in a low RPM range of an engine.

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 changed torque, a first planetary gear set including first, second, and third rotation elements, a second planetary gear set including fourth, fifth, and sixth rotation elements, a compound planetary gear set formed by combining third and fourth planetary gear sets and including seventh, eighth, ninth, and tenth rotation elements, a fifth planetary gear set including eleventh, twelfth, and thirteenth rotation elements, and six friction elements disposed between any one rotation element among thirteen rotation elements and another rotation element or the input shaft, or between any one rotation element among the thirteen rotation elements and a transmission housing.

Abstract: A multi-stage transmission for a vehicle may include an input shaft and an output shaft, a first planetary gear device, a second planetary gear device, a third planetary gear device, and a fourth planetary gear device provided between the input shaft and the output shaft so as to transfer a torque and each including three rotating elements, and at least six shifting elements connected to the rotating elements of the first to fourth planetary gear devices.

Abstract: The present disclosure is a multi-stage transmission for a vehicle that has at least ten forward shifting stages and one reverse shifting stage. The multi-stage transmission has a relatively small number of parts and a simple configuration such that an engine may be operated at desired operation, thereby providing an improvement in the fuel efficiency of the vehicle, and the engine may be operated more quietly, thereby improving the quietness of the vehicle.

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 changed torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation, a third rotation shaft, a fourth rotation shaft selectively connected to the third rotation shaft, a fifth rotation shaft directly connected to the input shaft, and selectively connected to the third rotation shaft, a sixth rotation shaft, a seventh rotation shaft selectively connected to the sixth rotation shaft or the transmission housing, and an eighth rotation shaft directly connected to the output shaft, and selectively connected to the sixth rotation shaft.

Abstract: Nine-speed multi-stage transmission with four planetary gear sets, rotatable shafts and six shift elements. Sun of first set is connected to fifth shaft which is couplable, via third brake, to housing and is connectable, via first clutch, to drive shaft which is connectable, via second clutch, to seventh shaft which is connected to ring of third set and carrier of second set. Drive shaft is connectable to eighth shaft, via third clutch, connected to carrier of first set and sun of second set. Sixth shaft is connected to ring of second set and carrier of fourth set. Fourth shaft is connected to ring of first set and sun of fourth set and is couplable, via second brake, to housing. Third shaft is connected to sun of third set and is couplable, via first brake, to housing. Output shaft is connected to carrier of third set and ring of fourth set.

Abstract: A four-stage multi-stage transmission in which carrier of first gear set and ring gear of fourth gear set can be coupled to housing via first brake or to drive shaft via first clutch. Sun of first gear set can be coupled to housing via second brake. Ring gear of first gear set and sun of second gear set can be coupled to drive shaft via second clutch. Drive shaft can be coupled to ring gear of second gear set via third clutch. Carrier of second gear set is permanently connected to carrier of fourth gear set, and carrier of third gear set and sun of fourth gear set are permanently connected to drive shaft. By varying further couplings within the multi-stage transmission, a set of gears having similar properties is provided.

Abstract: A multi stage transmission for the vehicle may include an input shaft and an output shaft, a first planetary gear device, a second planetary gear device, a third planetary gear device, and a fourth planetary gear device configured to transfer a rotating force between the input shaft and the output shaft and each including three rotating elements, and at least six shift elements connected to the rotating elements of the planetary gear devices.

Abstract: A power transmission system of a hybrid vehicle includes an input shaft, an output shaft, a first planetary gear set, a second planetary gear set, a third planetary gear set, a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft, a fifth rotational shaft, a sixth rotational shaft, a seventh rotational shaft, and three friction elements selectively connecting the rotational shafts to each other or selectively connecting the respective rotational shafts and the transmission housing such that the power transmission system can suppress conversion to an ENG mode by providing sufficient power performance upon wide open throttle (WOT) launching and maximally use power of an engine upon conversion to a first HEV mode and a third HEV mode.

Abstract: A planetary gear train of an automatic transmission for a vehicle may include an input shaft into which power of an engine is input, a first planetary gear set including a first sun gear, a first planetary carrier, and a first ring gear, a second planetary gear set including a second sun gear, a second planetary carrier, and a second ring gear, a third planetary gear set including a third sun gear, a third planetary carrier, and a third ring gear, a fourth planetary gear set including a fourth sun gear, a fourth planetary carrier, and a fourth ring gear, a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft, a fifth rotational shaft, a sixth rotational shaft, a seventh rotational shaft, and an eighth rotational shaft.

Abstract: A multi-stages automatic transmission for a vehicle includes a first, second, third and fourth planetary gear sets, each including a first, second and third rotation elements, respectively, and friction members including first, second, third and fourth clutches and first and second brakes.

Abstract: A multi-speed transmission includes at least four planetary gear sets, eight rotatable shafts and six shifting elements. Selective actuation of the shifting elements brings about different transmission ratio relationships between an input shaft and an output shaft, such that ten forward gears and one reverse gear are able to be realized.

Abstract: An automatic transmission includes plural planetary gear mechanisms rotatably supported by a housing to be coaxial to a rotation axis, a ring gear of the foremost planetary gear mechanism being connected to a sun gear of the rearmost planetary gear mechanism, an input shaft being connected to a carrier of the foremost planetary gear mechanism, an output shaft being connected to a carrier of the rearmost planetary gear mechanism, a rotation member positioned at a radially outward of the ring gear of the rearmost planetary gear mechanism to be rotatable coaxially to the ring gear of the rearmost planetary gear mechanism, a brake selectively fixing the rotation member to the housing, a clutch selectively connecting the rotation member and a carrier of the planetary gear mechanism positioned at front relative to the rearmost planetary gear mechanism by one, and a dog clutch selectively connecting the ring gear of the rearmost planetary gear mechanism and the rotation member.

Abstract: The present disclosure provides an automatic transmission having an input adapted to couple to a torque-generating mechanism and an output coupled to the input. The transmission also includes a first rotating torque-transferring mechanism disposed along a first torque path and coupled to the input. A second rotating torque-transferring mechanism is disposed along a second torque path and is coupled to the input independent of the first torque-transferring mechanism. The transmission includes a plurality of stationary torque-transferring mechanisms, each of which is disposed between the input and output. The transmission includes a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset, where each gearset includes a sun gear, a ring gear, and a carrier assembly. Moreover, the carrier assembly of the third planetary gearset is coupled to the output and the sun gear of the fourth planetary gearset.

Abstract: A multi-stage auto transmission for a vehicle may include first, second, third and fourth planetary gear sets each including first, second and third rotating elements, friction members including first, second and third clutches and first, second and third brakes, an input shaft to which rotation power is inputted, and an output shaft from which the rotation power is outputted. By selectively or continuously connecting the rotating elements of the planetary gear sets to the input shaft, the output shaft or each other, the multi-stage auto transmission implements ten forward speeds and one reverse speed.

Abstract: An automatic transmission for a vehicle includes a housing, three single pinion type planetary gear mechanisms being supported by the housing, an input shaft supported by the housing and connected to a first carrier, an output shaft connected to a third carrier, a brake, a first clutch selectively connecting the first carrier and a second sun gear, a second clutch, a third clutch, a fourth clutch, and a switching clutch. The switching clutch selectively switches positions to a position where a third ring gear is fixed to the housing, a position where a second carrier is fixed to the housing, or a position where the third ring gear and the second carrier are released relative to the housing. The first clutch connects the first carrier and the second sun gear, and the switching clutch fixes the second carrier to the housing when establishing a reverse speed.

Abstract: A planetary gear train is disclosed. The planetary gear train may include a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set and a fifth planetary gear set between an input end and an output end. The planetary gear train may further include a brake set having a first brake, a second brake and a third brake, and a clutch set having a first clutch and a second clutch. The first brake, the second brake and the third brake, the first clutch and the second clutch may be selectively actuable to produce three different forward speed ranges and two different reverse speed ranges between the input end and the output end.

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 changed torque, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first rotation shaft selectively connected to a transmission housing, a second rotation shaft directly connected to the input shaft, a third rotation shaft, a fourth rotation shaft, a fifth rotation shaft selectively connected to the second rotation shaft or the fourth rotation shaft, a sixth rotation shaft directly connected to the output shaft, a seventh rotation shaft selectively connected to the transmission housing or the third rotation shaft, and an eighth rotation shaft selectively connected to the sixth rotation shaft.

Abstract: An automatic transmission (10) includes in a transmission case (11), an input (an input shaft 12), an output (an output shaft 13), first to fourth planetary gear sets (PG1, PG2, PG3, and PG4) of a single pinion type, first to third clutches (CL1-CL3) engaging and disengaging predetermined rotating elements of the first to fourth planetary gear sets, a first brake (BR1) engaging and disengaging a third ring gear (R3) with and from the transmission case, and a second brake (BR2) engaging and disengaging a first sun gear (S1) and a fourth sun gear (S4) with and from the transmission case. The input, the output, the planetary gear sets, the clutches, and the brakes are arranged coaxially with each other. The first, second, third, and fourth planetary gear sets are arranged in this order from one axial end to the other axial end of the automatic transmission.

Abstract: An automatic transmission (10) includes an input shaft (12), an output (an output shaft 13) arranged coaxially with the input shaft and engaged with a differential mechanism, first and second planetary gear sets (PG1 and PG2) of a double pinion type, third and fourth planetary gear sets (PG3 and PG4) of a single pinion type, first to third clutches (CL1-CL3) engaging and disengaging predetermined rotating elements of the first to fourth planetary gear sets, and first and second brakes (BR1 and BR2) engaging and disengaging a second carrier (C2) and a first carrier (C1) from a transmission case (11). A gear ratio of the automatic transmission is 1 in a sixth gear.

Abstract: A transmission includes an input shaft, an output shaft, at least five planetary gearsets, a variable-ratio unit, and at least six clutches. The input shaft is configured to receive torque from a drive unit. The output shaft is configured to transmit torque to a load. The at least five planetary gearsets, the variable-ratio unit, and the at least six clutches are arranged between the input shaft and the output shaft. The at least six clutches are selectively engageable in combination with one another to select one of at least eight operating modes.

Abstract: A transmission includes a drive shaft, an output shaft, a housing, a first planetary gear set, a second planetary gear set and a third planetary gear set, as well as six shift elements, comprising a first brake, a second brake, a first clutch, a second clutch, a third clutch and a fourth clutch. Each planetary gear set features a sun gear, a planetary gear, a planetary carrier and a ring gear. The drive shaft and the output shaft are arranged in a manner axially offset to each other and the drive shaft is connectable to the ring gear of the third planetary gear set and the second brake through the first clutch. The ring gear of the third planetary gear set and the second brake are also connected to each other. A third shaft is arranged coaxially to the drive shaft.

Abstract: The multi-speed transmission comprises four planetary gear sets, eight rotating shafts and six shifting elements, whereas the sun gear of the first planetary gear set is connected to the fifth shaft, which is connectable to the input shaft through a first clutch and is attachable to a housing through a third brake, whereas the drive shaft is, through a second clutch, connectable to the seventh shaft connected to the bar of the fourth planetary gear set and the ring gear of the third planetary gear set and is connected to the sun gear of the second planetary gear set, whereas the sixth shaft is connected to the ring gear of the first planetary gear set, the bar of the second planetary gear set and the ring gear of the fourth planetary gear set and the third shaft is connected to the sun gear of the third planetary gear set and the sun gear of the fourth planetary gear set, and is attachable to the housing through a first brake, whereas the fourth shaft is connected to the bar of the first planetary gear set, i

Abstract: Multi-stage transmission comprising four gear sets, eight rotatable shafts and six shift elements. Eighth shaft is connected to suns of first and second sets and is connectable, via third clutch, to drive shaft. Drive shaft is connectable, via first clutch, to fourth shaft connected to ring gear of first set and couplable, via second brake, to housing. Drive shaft is connectable, via second clutch, to seventh shaft connected to carrier of second set and ring gear of third set. Sixth shaft is connected to ring gear of second set and carrier of fourth set and third shaft is connected to sun of third set and is couplable, via first brake, to housing. Fifth shaft is connected to carrier of first set and sun of fourth set and is couplable, via third brake, to housing. Output shaft is connected to carrier of third set and ring gear of fourth set.

Abstract: The multi-speed transmission comprises four planetary gear sets eight rotatable shafts and six shifting elements. The sun gear of the first planetary gear set is connected to the fifth shaft, which is attachable to the housing through a third brake. The input shaft is, through a first coupling, connectable to the seventh shaft connected to the sun gear of the third planetary gear set, which is connected to the bar of the first planetary gear set and is connectable to the fourth shaft through a third coupling, which is connected to the sun gear of the second planetary gear set and is attachable to the housing through a second brake. The input shaft is, through a second coupling, connectable to the eighth shaft connected to the sun gear of the fourth planetary gear set and the third shaft is connected to the ring gear of the first planetary gear set, the bar of the second planetary gear set, and the ring gear of the fourth planetary gear set, and is attachable to the housing through a first brake.

Abstract: A transmission includes a drive shaft, an output shaft, a housing, three planetary gear sets, six shift elements, comprising a first brake, a second brake along with a first clutch, a second clutch, a third clutch and a fourth clutch. The shift elements are selectively actuated, by which nine forward gears and one reverse gear are realized. The drive shaft and the output shaft are arranged in a manner axially offset to each other, and the drive shaft is connectable through the first clutch to the second brake and through the second clutch to the sun gear of the second planetary gear set and to the sun gear of the third planetary gear set, whereas the sun gear of the second planetary gear set and the sun gear of the third planetary gear set are also connected to each other.

Abstract: A planetary gear train of an automatic transmission for a vehicle may include an input shaft, a first planetary gear set including a first sun gear, a first planetary carrier, and a first ring gear, a second planetary gear set including a second sun gear, a second planetary carrier, and a second ring gear, a third planetary gear set including a third sun gear, a third planetary carrier, and a third ring gear, a fourth planetary gear set including a fourth sun gear, a fourth planetary carrier, and a fourth ring gear, a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft, a fifth rotational shaft, a sixth rotational shaft, a seventh rotational shaft, and an eighth rotational shaft.

Abstract: Transmissions with at least four gearing-arrangements and six clutches that produce nine forward speeds and one reverse. The gearing-arrangements may be simple planetary gearsets. The six clutches may include one to three brakes, and at least one clutch is an input clutch and one an output clutch. The input-shaft of each transmission may be associated with a carrier of one of the simple planetary gearsets. The input-shaft may be associated with carrier-1. The output-shaft of some transmissions may be associated with a carrier of another of the simple planetary gearsets. The output-shaft may be associated with carrier-4. Sun and ring gears in gearing-arrangements may be connected to a transmission housing. Sun-3 and ring-4 may be grounds.

Abstract: Multi-stage transmission comprises four planetary gear sets, rotatable shafts and six shift elements. Sun of first set is connected to fifth shaft which is connectable, via first clutch, to drive shaft and is couplable, via third brake, to housing. Drive shaft is connectable, via second clutch, to seventh shaft which is connectable to carrier of fourth set and ring of third set and is connectable, via third clutch, to eighth shaft which is connected to sun of second. Sixth shaft is connected to ring of first set, carrier of second set and ring of fourth set. Third shaft is connected to sun of third set and sun of fourth set and can be coupled, via first brake, to housing. Fourth shaft is connected to carrier of first set and ring of second set and is couplable, via second brake, to housing. Drive shaft is connected to carrier of third set.

Abstract: An automatic transmission includes a thrust bearing ? disposed between a third sun gear of a third planetary gear mechanism and a second sun gear of a second planetary gear mechanism. Accordingly, transmitting a thrust load acting on the second sun gear of the second planetary gear mechanism from the thrust bearing to an input shaft via the third sun gear of the third planetary gear mechanism can avoid, as much as possible, a case where the thrust load is transmitted from the third planetary gear mechanism to the input shaft via a fourth planetary gear mechanism, and reduce friction loss of multiple thrust bearings interposed among elements or the like of the third planetary gear mechanism and the fourth planetary gear mechanism.

Abstract: A transmission is provided having an input member, an output member, at least three planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes actuatable in combinations of three to establish a plurality of forward gear ratios and at least one reverse gear ratio.

Abstract: Multi-stage transmission comprising four planetary gear sets, eight rotatable shafts and six shift elements. Sun of first set is connected to eighth shaft connected to sun of second set and is connectable, via third clutch, to drive shaft. Drive shaft is connectable, via first clutch, to fourth shaft connected to carrier of first set and is culpable, via second brake, to housings. Drive shaft is connectable, via second clutch, to seventh shaft connected to carrier of fourth set and ring of third set. Sixth shaft is connected to ring of first set, carrier of second set and ring of fourth planetary gear set. Third shaft is connected to sun of third set and sun of fourth set and is couplable, via first brake, to housing. Fifth shaft is connected to ring of second set and is couplable, via third brake, to housing. Output shaft is connected to carrier of third set.

Abstract: A multi-speed transmission includes four planetary gear sets, eight rotatable shafts and six shifting elements. The eight rotatable shafts include an input shaft and an output shaft. Selective actuation of the six shifting elements brings about different transmission ratio relationships between the input shaft and the output shaft of the eight rotatable shafts.

Abstract: A transmission includes a housing, four planetary mechanisms, four clutches, two brakes, plural connection members connecting elements of each of planetary mechanisms one another, an input shaft, and an output shaft. A first connection member at which the third clutch is positioned is positioned at an outer periphery side compared to a second connection member connecting a ring gear of the second planetary mechanism and a carrier of the third planetary mechanism. An installation surface to which a third brake braking a rotation of a connection part is addable and which is opposed to an inner periphery surface of the housing is formed at the connection part connecting the third clutch and a ring gear of the third planetary mechanism among the first connection member.

Abstract: A family of transmission gearing arrangements produces at least nine forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. Each disclosed transmission includes four planetary gear sets, three brakes, and either three or four clutches. One embodiment produces twelve forward speed ratios and two reverse speed ratios. Another embodiment produces thirteen forward speed ratios.

Abstract: Multi-speed transmission comprising four planetary gear sets, eight rotatable shafts and six shifting elements, the sun gear of the first planetary gear set is connected to the third shaft, which is selectively coupleable or detachably connectable to the input shaft through a first clutch and is attachable to the transmission housing through a first brake, whereas the input shaft is, through a second clutch, selectively coupleable or detachably connectable to the fourth shaft connected to the bar of the third planetary gear set, which is attachable to the bar of the first planetary gear set through a second brake, which is coupled to the transmission housing, whereas the input shaft is connected to the sun gear of the fourth planetary gear set, whereas the eighth shaft is connected to the ring gear of the first planetary gear set, the sun gear of the second planetary gear set and the sun gear of the third planetary gear set, and the fifth shaft is connected to the bar of the second planetary gear set, the rin

Abstract: A four-stage multi-gear transmission in which the carrier of a fourth gearset (4) is connected in a rotationally fixed manner to a housing (72), a ring gear of a first gearset (1) is connected rotationally fixed to a sun gear (41) of the fourth gearset (4), a drive input (70) can couple, via a first clutch (61), a sun gear (11) of the first gearset (1), a ring gear (42) of the fourth gearset (4) can couple, via a second clutch (62), a drive output (71), a carrier (13) of the first gearset (1) can couple, via a first brake (51), a housing (72) and the sun gear (11) of the first gearset (1) can couple, via a second brake (52=), the housing (72). Varying other couplings within the multi-gear transmission can provide a range of transmissions with similar properties.

Abstract: Nine gear transmission with four planetary gear sets, rotatable shafts and six shift elements. Sun of first set is connected to fifth shaft connected to sun of second set and is couplable to housing by third brake. Drive shaft is releasably connected by first clutch to fourth shaft connected to carrier of second set and is couplable by second brake to housing. Drive shaft is connectable by of second clutch to seventh shaft connected to ring of second set and sun of third set and is connectable by of third clutch to eighth shaft connected to ring of fourth set and carrier of third set. Shaft (6) is connected to ring of third set and carrier of first, and third shaft is connected to sun of fourth set and is couplable by first brake to housing. Output shaft is connected to carrier of fourth set and ring of first set.

Abstract: Transmission with four gear sets, shafts and six shift elements. Sun of first set is connected to fifth shaft, which is couplable to housing by second brake and connectable by first clutch to driveshaft, which is connectable to seventh shaft connected by second clutch to carrier of second set and is connectable by third clutch to eighth shaft connected to carrier of first set and to sun of second set. Seventh shaft is connectable to third shaft connected to ring gear of third set by fourth clutch. Sixth shaft is connected to ring gear of second set and carrier of fourth set. Fourth shaft is connected to ring gear of first set and to sun of fourth set and is couplable to housing by first brake. Sun of third set is coupled to housing. Output shaft is connected to carrier of third set and to ring gear of fourth set.

Abstract: A transmission gearing arrangement produces nine forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. Some embodiments includes four simple planetary gear sets and six shift elements of which two may be brakes. Other alternative embodiments may additionally include a third brake.

Abstract: A transmission gearing arrangements produces up to ten forward and one reverse speed ratios by selective engagement of various combinations of four shift elements. Each disclosed transmission includes four planetary gear sets and at least six shift elements. One of the shift elements may be a dog clutch. Optional passive one way brakes simplify the control.

Abstract: A transmission is provided having an input member, an output member, at least four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes actuatable in combinations of three to establish a plurality of forward gear ratios and at least one reverse gear ratio.

Abstract: A family of transmission gearing arrangements produces up to nine forward and one reverse speed ratios by selective engagement of three shift elements in various combinations. Each disclosed transmission includes four planetary gear sets and six elements. Two of the arrangements feature planetary gear sets that are separated radially and are particularly suited to applications that require reduced axial length.

Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. The torque transmitting devices include clutches and brakes including a selectable one-way clutch actuatable in combinations of two to establish a plurality of forward gear ratios and one reverse gear ratio.

Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes including a selectable one-way clutch actuatable in combinations of two to establish a plurality of forward gear ratios and one reverse gear ratio. The transmission also includes a transmission auto start/stop enabler which includes a latch mechanism. The latch mechanism readies one of the plurality of torque transmitting devices during an engine auto stop/start event or in preparation for a stop of the motor vehicle.

Abstract: A transmission includes an input member, an output member, at least four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes that are actuated in various combinations to establish a plurality of forward gear ratios and a reverse gear ratio.

Abstract: An automatic transmission device configured to change the relative speeds between an input and output member. The automatic transmission is configured with four planetary gear mechanisms and a plurality of clutches and brakes, the arrangement being configured so as to reduce a loss due to the meshing between gears. The automatic transmission is configured with a first planetary gear mechanism including first to third rotary elements. A second planetary gear mechanism including fourth to sixth rotary elements, a third planetary gear mechanism including seventh to ninth rotary elements, and a fourth planetary gear mechanism including tenth to twelfth rotary elements. A first coupling element that couples the first, fifth and ninth rotary elements, a second coupling element that couples the second and twelfth, rotary elements, a third coupling element that couples the third and eleventh, and a fourth coupling element that couples the sixth and eighth elements to each other.

Abstract: Multi-stage transmission comprising four planetary gear sets, eight rotatable shafts and six shift elements. Sun of first set is connected to eighth shaft connected to sun of second set and is connectable, via third clutch, to drive shaft. Drive shaft is connectable, via first clutch, to fourth shaft connected to carrier of first set and is couplable, via second brake, to housing. Drive shaft is connectable, via second clutch, to seventh shaft connected to carrier of fourth set and ring of third set, Sixth shaft is connected to ring of first set, carrier of second set and ring of fourth planetary gear set. Third shaft is connected to sun of third set and sun of fourth set and is couplable, via first brake, to housing. Fifth shaft is connected to ring of second set and is couplable, via third brake, to housing. Output shaft is connected to carrier of third set.

Abstract: A four-stage multi-stage transmission in which the carrier (12) of the first planetary gear set (1) is connected with a sun gear (41) of the fourth planetary set, a ring gear (43) of the fourth planetary gear set (4) is connected with the output shaft (71), a ring gear (13) of the first planetary gear set (1) and a carrier (22) of the second planetary gear set (2) can be coupled with the housing (72), via a first brake (51). A sun gear (11) of the first planetary gear set (1) can be coupled with the housing (72), via a second brake (52), and the ring gear (43) can be coupled with the sun gear (41), respectively, of the fourth planetary gear set (4) via a first clutch (61).