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 a first sun gear, a first planet carrier, and a first ring gear, a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear, a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear, a fourth planetary gear set including a fourth sun gear, a fourth planet carrier, and a fourth ring gear, a first rotation shaft, a second rotation shaft, a third rotation shaft, a fourth rotation shaft, a fifth rotation shaft, a sixth rotation shaft, a seventh rotation shaft, and an eighth rotation shaft.

Abstract: A planetary gear train of an auto transmission for a vehicle may include an input shaft, four planetary gear sets, eight rotational shafts and six friction elements. The rotational shafts connect rotation elements of corresponding first, second, third, and/or fourth planetary gear sets, and one or more rotational shafts are directly or selectively connected to an output shaft or a transmission housing. The six friction elements selectively connect the rotational shafts and selectively connect one or more rotational shafts with the transmission housing.

Abstract: The first planetary gear set is configured to integrally rotate by a first clutch. The first element is coupled with the fifth element. The second element is configured to be locked through a first brake to a stationary section and configured to be coupled through a second clutch with the ninth element. The third element is coupled with the input shaft. The fourth element is configured to be coupled through a third clutch with the ninth element. The sixth element is locked to the stationary section. The seventh element is configured to be locked through a second brake to the stationary section. The eighth element is coupled with an output shaft. The ninth element is coupled with the twelfth element. The tenth element is configured to be coupled through a fourth clutch with the output shaft. The eleventh element is coupled with the input shaft.

Abstract: A multi-speed transmission in which a sun gear of a fourth planetary gear set is connected with the housing in a non-rotatable manner, a ring gear of a first planetary gear set is permanently connected with a ring gear of the fourth planetary gear set, a sun gear of the first planetary gear set and a sun gear of a second planetary gear set can be coupled with the housing, via a first brake, a carrier of the first planetary gear set can be coupled with the housing, via a second brake, and the output shaft can be coupled with a carrier of the fourth planetary gear set, via a first clutch. Variations of other couplings within the multi-speed transmission forms a set of transmissions having similar properties.

Abstract: A transmission with nine forward and one reverse gear having four planetary gearsets, eight shafts and six shifting elements. The sun gears of gearsets (P1, P3) couple shaft (5), and can couple the housing by brake (05). Input shaft (1) can couple, via clutch (14), shaft (4), which couples carrier and sun gears of respective gearsets (P3, P2) and can couple housing via brake (04). Shaft (1) can couple, via clutch (17), shaft (7), which couples ring gear of gearset (P3) and can couple, via clutch (18), shaft (8) which couples ring gear and carrier of respective gearsets (P4, P2). Shaft (6) couples ring gear and carrier gear of respective gearsets (P2, P4). Shaft (3) couples sun gear of gearset (P4) and can couple, via brake (03), the housing. Output shaft (2) couples carrier and ring gear of respective gearsets (P4, P1).

Abstract: Power-shiftable multi-speed transmission in planetary design for a vehicle for an arrangement between an input shaft and an output shaft, characterized in that the multi-speed transmission features two parallel shaft trains, six shifting elements, at least two spur gear stages and three planetary gear sets, each with one sun gear, one ring gear and one planetary carrier with several planetary gears, whereas the planetary carrier is consolidated into one carrier, and that the two shaft trains are connectable to each other through at least two spur gear stages, whereas, through a selective intervening of the six shifting elements, different transmission ratio relationships can be brought out between the input shaft and output shaft, such that a multitude of forward gears, in particular nine forward gears, and at least one reverse gear, are able to be realized.

Abstract: A multi-speed transmission includes a housing; an input member and an output member; four planetary gear trains including a first planetary gear train, a second planetary gear train, a third planetary gear train and a fourth planetary gear train, wherein each of the planetary gear trains includes a ring gear, a planetary carrier and a sun gear; and six control elements. Each of the six control elements is operatively connected to at least one of the planetary gear trains and selectively engageable to produce a set of different speeds between the input member and the output member. The set of different speeds includes eight forward speeds and two reverse speeds.

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

Abstract: An automatic transmission configured with four planetary gear mechanisms, three clutches, and three brakes, which are configured to provide nine forward speeds and a reverse speed. The combination of elements results in, amongst other benefits, improved torque transfer efficiency. A first planetary gear mechanism including first to third rotary elements that form a sequence of the first rotary element, the second rotary element, and the third rotary element when arranged in an order at intervals corresponding to gear ratios in a velocity diagram. 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.

Abstract: An improved transmission is provided including a splitter shaft having a concentric cavity defined in a distal end thereof and an outer wall surrounding the cavity. The outer wall has an increased thickness in order to reduce failure and fracturing in the outer wall area. A bearing hub adapted for supporting a larger bearing is also provided. The improved transmission may include a system for utilizing existing lubrication lines in order to lubricate a center section of the transmission. The components of the present invention may be provided as part of a kit for retrofitting an existing transmission in order to reduce failures and increase lifespan.

Abstract: A multi-speed transmission may include an input member and an output member disposed in a housing. A first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set may be disposed within the housing, each planetary gear set including a sun gear, a planet carrier, and a ring gear. Six control elements may be operably coupled to each of the planetary gear sets and selectively engagable to create a set of different gear ratios between the input member and the output member. The set of different gear ratios may include at least ten forward gear ratios and at least one reverse gear ratio.

Abstract: A multi-stage transmission with nine forward and one reverse gear includes four planetary gearsets, shafts and shifting elements. The sun gear of gearset (P1) couples shaft (5) which can coupled, via brake (05), the housing. The input shaft can couple, via clutch (14), shaft (4) which couples the carriers of gearsets (P1, P2) and can coupled, via brake (04), the housing. The input shaft can couple, via clutch (17), shaft (7) which couples the ring gear of gearset (P1) and the sun gear of gearset (P2) and can couple, via clutch (18), shaft (8), which couples the carrier of gearset (P4) and the ring gear of gearset (P3). Shaft (6) couples the ring gears of gearsets (P2, P4). Shaft (3) couples the sun gears of gearsets (P3, P4) and can couple, via brake (03), the housing. The output shaft couples the carrier of gearset (P3).

Abstract: A family of transmission gearing arrangements produces up to ten forward and one reverse speed ratios by selective engagement of various combinations of three or four shift elements. Each disclosed transmission includes four planetary gear sets and six shift elements. Two of the shift elements can be brakes.

Abstract: A transmission has 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 four or more to establish a plurality of forward gear ratios and at least one reverse gear ratio.

Abstract: A planetary gear train of an automatic transmission may include an input shaft, an output shaft, a compound planetary gear set disposed on the output shaft, and including a first rotation element selectively connected to the input shaft through two paths respectively having an externally-meshed gear and operated as a selective fixed element, a second rotation element selectively connected to the input shaft through one path having an externally-meshed gear and operated as a selective fixed element, a third rotation element connected to the output shaft, and a fourth rotation element selectively connected to the input shaft through one path having an externally-meshed gear, three transfer gears forming the externally-meshed gears, and friction elements provided with clutches selectively connecting the first, second, and fourth rotation elements to the input shaft and brakes selectively connecting the first and second rotation elements to a transmission housing.

Abstract: A planetary gear train of an automatic transmission may include: a first shaft; a second shaft parallel with the first shaft; a first gear set on the first shaft including a first element selectively connected to the first shaft, a second element selectively connected to the first shaft and a transmission housing, and a third element; a second gear set on the second shaft including a fourth element operably connected to the first element and selectively connected to the first shaft, a fifth element connected to the third element and directly connected to an output gear, and a sixth element selectively connected to the first shaft and selectively connected to the housing; three transfer gears; and frictional elements including clutches selectively connecting the first shaft to elements of the first and second gear sets and brakes selectively connecting elements of the first and second gear sets to the housing.

Abstract: A powertrain includes an engine, electric motor, disconnect clutch and a transmission. The transmission has 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. The electric motor is connected to the input of the transmission and the engine is selectively connected to the input member through the disconnect clutch. A controller is configured to control the operation of the powertrain.

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 multi-stage transmission with eight forward and one reverse gear, including drive and output shafts, planetary gearsets, gear stage, shift elements and shafts. The drive shaft couples the carrier of gearset (P1) and can couple shaft (5) via clutch (15). Shaft (5) couples the ring and sun gears of respective gearsets (P2, P3). The ring gear of gearset (P1) couples shaft (6), which couples the sun gear of gearset (P2). Shaft (3) couples the sun gear of gearset (P1) and the ring gear of gearset (P3) and can couple the housing via brake (03). The carrier of gearset (P2) couples shaft (4), which can couple the output shaft via gear stage (S1) and clutch (24). The carrier of gearset (P3) couples shaft (7), which can couple the output shaft via gear stage (S2) and clutch (27), and clutch (46, 56, 45) engages to block gearset (P2).

Abstract: Multi-stage transmission comprising four gear sets, shafts and 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 ring of first set and is couplable, via first brake, to the housing. Drive shaft is connectable, via second clutch, to seventh shaft connected to carrier of second set and being connectable, via fourth clutch, to third shaft which is connectable to ring of third set. Sixth shaft is connected to ring of second set and carrier of fourth set. Sun of third set is coupled to housing. Fifth shaft is connected to carrier of first set and sun of fourth set and is couplable, via second brake, to housing. Output shaft is connected to carrier of third set and ring of fourth set.

Abstract: A multi-gear planetary transmission for a vehicle having four planetary gearsets (RS1, RS2, RS3, RS4), a plurality of shafts (I, II III, IV, V, VI, VII VIII, IX) and six shifting elements (A, B, C, D, E, F) which can be actuated to obtain a plurality of gears. At least the fourth planetary gearset (RS4) is a plus planetary gearset, the first shaft (I) is the drive input (An) which is connected to the planetary carrier (PT1) of the first planetary gearset (RS1) and to the third shifting element (C). The second shaft (II) is the drive output (Ab) which is connected at least to the ring gear (HO4) of the fourth planetary gearset (RS4). For each gear, at least four of the shifting elements (A, B, C, D, E, F) are engaged.

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: A multi-stage transmission which has a sun gear of a fourth planetary gear set connected with the housing in a non-rotatable manner, a ring gear of a first planetary gear set is permanently connected with a ring gear of the fourth planetary gear set, a sun gear of the first planetary gear set can be coupled with the housing via a first brake, a carrier of the first planetary gear set can be coupled with the housing via a second brake, the input drive shaft can be coupled with sun gear of the first planetary gear set via a first clutch, and the drive shaft can be coupled with a carrier of the fourth planetary gear set via a second clutch. Variations of other couplings within the multi-stage transmission result in transmissions having similar properties.

Abstract: Power-shiftable multi-speed transmission in planetary design for a vehicle for an arrangement between an input shaft (AN) and an output shaft (AB), characterized in that the multi-speed transmission features two parallel shaft trains (WS1, WS2), six shifting elements (K1, K2, K3, K4, B1, B2), at least two spur gear stages (STS1, STS2) and three planetary gear sets (PS1, PS2, PS3), each with one sun gear (SO1, SO2, SO3), one ring gear (HO1, HO2, HO3) and one planetary carrier with several planetary gears, whereas the planetary carrier is consolidated into one bar (ST1, ST2, ST3), and that the two shaft trains (WS1, WS2) are connectable to each other through at least two spur gear stages (STS1, STS2), whereas, through a selective intervening of the six shifting elements (K1, K2, K3, K4, B1, B2), different transmission ratio relationships can be brought out between the input shaft (AN) and output shaft (AB), such that a multitude of forward gears, in particular nine forward gears, and at least one reverse gear,

Abstract: A transmission gearing arrangement has four simple planetary gear sets and five or six shift elements. One embodiment has three brakes and three clutches and produces nine forward speeds by selective engagement of various combinations of three of the shift elements. A second embodiment has two brakes and four clutches and produces nine forward speeds by selective engagement of various combinations of three of the shift elements. A third embodiment has two brakes and three clutches and produces seven forward speeds by selective engagement of various combinations of two of the shift elements. Each embodiment may optionally include a passive one way brake that simplifies the control of certain shifts.

Abstract: A transmission gearing arrangement has four simple planetary gear sets and five or six shift elements. A ring gear is fixedly held against rotation. A sun gear and a carrier are fixedly coupled to the input shaft. One embodiment has two brakes and three clutches and produces seven forward speeds by selective engagement of various combinations of two of the shift elements. Other embodiments have two brakes and four clutches and produce nine forward speeds by selective engagement of various combinations of two of the shift elements. Each embodiment may optionally include a passive one way brake that simplifies the control of certain shifts.

Abstract: A gear train may include an input shaft adapted to receive torque of an engine, an output shaft adapted to output changed torque, a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof, a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear as rotation elements thereof, and a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear as rotation elements thereof.

Abstract: A multi-stage transmission with eight forward and one reverse gear, including input and output shafts, planetary gear sets, gear stages shift elements and shafts. The input shaft couples the carrier of gearset (P1) and, via clutch (15), can couple shaft (5), which couples the ring gear of gearset (P2) and which, via clutch (58), can couple shaft (8), which couples the sun gear of gearset (P3). The ring gear of gearset (P1) couples shaft (6) and the sun gear of gearset (P2). Shaft (3) couples the sun and ring gears of respective gearsets (P1, P3) and can couple, via brake (03), the housing (G). The carrier of gearset (P2) couples shaft (4), which can couple the output shaft via the gear stage (S1) and clutch (24). The carrier of gearset (P3) couples shaft (7), which couples gear stage (S2) and the output shaft. Clutch (46) can block gearset (P2).

Abstract: A clutch assembly is disclosed that combines a positively engaging dog clutch and one way clutch. The two devices are design such that the one way clutch never interferes with the engagement or disengagement of the dog clutch. In one embodiment, the one way clutch transmits torque in particular rotational positions and the dog teeth are circumferentially placed such that they do not engage in any of these positions. In another embodiment, the dog clutch piston, to which the teeth are secured, is permitted to rotate enough to accommodate any interference between dog teeth during engagement. In either embodiment, the teeth faces that transmit torque in the same direction as the one way clutch may be angled such that torque in that direction tends to disengage the dog clutch.

Abstract: A planetary gear train includes first, second, third and fourth planetary gear sets, first rotating body including first sun gear, second rotating body including first planet carrier, third rotating body including first ring gear and third and fourth sun gears, fourth rotating body including second sun gear, fifth rotating body including second planet carrier, sixth rotating body including second ring gear and third planet carrier, seventh rotating body including third ring gear and fourth planet carrier, an eighth rotating body including fourth ring gear, first clutch variably connecting the first and fourth rotating bodies, second clutch variably connecting the second and fourth rotating bodies, third clutch variably connecting the third and fifth rotating bodies, fourth clutch variably connecting the fifth and eighth rotating bodies, first brake variably connecting the first rotating body and the transmission housing, and second brake variably connecting the eighth rotating body and the transmission housin

Abstract: A transmission gearing arrangement produces eleven forward speed ratios and one reverse speed ratio by selective engagement of three shift elements in various combinations. One embodiment includes four simple planetary gear sets, four clutches, and two brakes. Another embodiment includes two axis transfer gear pairs, three simple planetary gear sets, four clutches, and two brakes. Each of these embodiments may include a one way brake such that the first shift is non-synchronous. A third embodiment includes four simple planetary gear sets, four brakes, and two clutches.

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 four-stage multi-stage transmission, in which a ring gear of a first planetary gear set is connected to a sun gear of a fourth planetary gear set, a ring gear of the fourth planetary gear set is connected to the output shaft, a sun gear of the first planetary gear set and a carrier of a second planetary gear set are couplable to the housing via a first brake, a carrier of the first planetary gear set is couplable to the housing via a second brake, the drive shaft is couplable to the carrier of the fourth planetary gear set via a first clutch, and a ring gear is couplable to the sun gear of the fourth planetary gear set via a second clutch. Adjustment of further couplings, within the multi-stage transmission, facilitates a set of gears having similar properties.

Abstract: A power shiftable multi-stage transmission of a planetary design and disposed between an input drive shaft and an output shaft for a vehicle. The multi-stage transmission has two parallel shaft trains, six shift elements, at least two spur gear stages and three planetary gear sets. Each of the planetary gear sets has a sun gear, a ring gear and a planet carrier combined in a carrier having multiple planetary gears. The two shaft trains may be connected to one another via the at least two spur gear stages. Different transmission ratios, between the input drive shaft and the output shaft, may be achieved by selective engagement of the six shift elements such that a plurality of forward gears, at least nine forward gears, and at least one reverse gear, may be implemented.

Abstract: A transmission has 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, a one-way clutch and brakes actuatable in combinations of two to establish a plurality of forward gear ratios and at least one reverse gear ratio.

Abstract: Multi-stage transmission comprising four gear sets, shafts and 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 ring of first set and is couplable, via first brake, to the housing. Drive shaft is connectable, via second clutch, to seventh shaft connected to carrier of second set and being connectable, via fourth clutch, to third shaft which is connectable to ring of third set. Sixth shaft is connected to ring of second set and carrier of fourth set. Sun of third set is coupled to housing. Fifth shaft is connected to carrier of first set and sun of fourth set and is couplable, via second brake, to housing. Output shaft is connected to carrier of third set and ring of fourth set.

Abstract: A family of transmission gearing arrangements provides a plurality of forward speed ratios and one or more reverse speed ratios by selective engagement of shift elements in various combinations. An input and an output are provided. Three planetary gear sets are located at an offset position relative to the input axis and the output axis. Axis transfer gears are provided to transfer rotational energy from the input to one of the planetary gear sets, and from one of the planetary gear sets to the output.

Abstract: A planetary gear train of an automatic transmission may include a first planetary gear set outputting a negative rotation speed by using a rotation speed selectively input from the input shaft, a second planetary gear set outputting a reduced rotation speed by using the rotation speed selectively input from the input shaft or to selectively become a direct-coupling state together with the first planetary gear set, a compound planetary gear set having four rotation elements by combining third and fourth planetary gear sets, seven rotational members including two rotation elements connected to each other or one rotation element among the rotation elements of the first and second planetary gear sets and the compound planetary gear set, and six friction members including clutches, and brakes.

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 embodiment includes four simple planetary gear sets and six shift elements of which one is a brake. Another embodiment includes two axis transfer gear pairs in place of one of the planetary gear sets.

Abstract: A transmission includes an input member, an output member, a plurality of torque-transmitting mechanisms that are selectively engageable to establish at least eight forward speed ratios and at least one reverse speed ratio between the input member and the output member, and one or more latches associated with one or more of the torque-transmitting mechanisms. The one or more latches engages the respective torque-transmitting mechanisms during or prior to a start event.

Abstract: A transmission of the present invention has 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. A method for controlling the transmission selectively engages the torque transmitting devices in combinations of at least two to establish at least nine forward speed ratios and at least one reverse speed 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 actuatable in combinations of four 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 at least 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 multi-stage transmission with eight forward and one reverse gear, including drive and output shafts, planetary gearsets, gear stage, shift elements and shafts. The drive shaft couples the carrier of gearset (P1) and can couple shaft (5) via clutch (15). Shaft (5) couples the ring and sun gears of respective gearsets (P2, P3). The ring gear of gearset (P1) couples shaft (6), which couples the sun gear of gearset (P2). Shaft (3) couples the sun gear of gearset (P1) and the ring gear of gearset (P3) and can couple the housing via brake (03). The carrier of gearset (P2) couples shaft (4), which can couple the output shaft via gear stage (S1) and clutch (24). The carrier of gearset (P3) couples shaft (7), which can couple the output shaft via gear stage (S2) and clutch (27), and clutch (46, 56, 45) engages to block gearset (P2).

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: An automatic transmission device that changes a relative speed between an input and output member. The transmission is configured with four planetary gear mechanisms, the first including first to third rotary elements, the second including fourth to sixth rotary elements, the third including seventh to ninth rotary elements, the fourth including tenth to twelfth rotary elements. Four coupling elements are provided, the first that couples the first, fifth and eighth rotary element to each other. The second couples the second and twelfth rotary elements. The third couples third and eleventh rotary elements. Fourth couples fourth and ninth rotary elements. Three clutches, are provided between (i) second coupling element and the input member, (ii) sixth rotary element and the input member, and (iii) seventh rotary element and the input member. Three brakes are provided on the (i) sixth rotary element, (ii) fourth coupling element, and (iii) tenth rotary element.

Abstract: An automatic transmission configured with four planetary gear mechanisms, three clutches, and three brakes, which are configured to provide nine forward speeds and a reverse speed. The combination of elements results in, amongst other benefits, improved torque transfer efficiency. A first planetary gear mechanism including first to third rotary elements that form a sequence of the first rotary element, the second rotary element, and the third rotary element when arranged in an order at intervals corresponding to gear ratios in a velocity diagram. 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.

Abstract: An automatic transmission that changes a relative speed between an input and output member. Four planetary gears are provided, having (i) first to third rotary elements, (ii) fourth to sixth rotary elements, (iii) seventh to ninth rotary elements, and (iv) tenth to twelfth rotary elements. Four couplings are provided between (i) first and sixth rotary elements, (ii) second rotary and ninth rotary elements, (iii) third and eighth rotary elements, and (iv) fifth and twelfth rotary elements. Three clutches are provided between (i) second coupling element and input member, (ii) fourth rotary element input member, and (iii) tenth rotary element and input member. Three brakes are provided at (i) the fourth coupling element, (ii) fourth rotary element, (iii) and seventh rotary element. The output member is connected to the third coupling element.

Abstract: The transmission has four planetary gear sets and shafts and shift elements. Sun gear of the planetary gearset (P1) couples shaft (5) which couples ring gear of gearset (P3) and is connectable, via clutch (58), to shaft (8), which couples carrier of gearset (P2) and is connectable, via clutch (89), to shaft (9), which couples sun gears of gearsets (P3, P4). Carrier of gearset (P1) couples drive shaft (1), which is connectable, via clutch (16), to shaft (6), which couples ring gear of gearset (P2). Sun gear of gearset (P2) couples shaft (3), which couples carrier of gearset (P3) and is connectable to the housing via brake (03). Ring gear of gearset (P4) couples shaft (4) which is connectable to the housing via brake (04). Output shaft (2) couples carrier of gearset (P4) and is connectable, via clutch (27), to shaft (7) which couples ring gear of gearset (P1).

Abstract: An automatic transmission is provided to adjust the speed between input and output members. The transmission is configured with four planetary gears having, (i) first to third rotary elements, (ii) fourth to sixth, (iii) seventh to ninth, and (iv) tenth to twelfth rotary elements. Three couplings are provided between (i) first and sixth rotary elements, (ii) second and ninth rotary elements, and (iii) third and eighth rotary elements. Three clutches are provided between (i) second coupling element and tenth rotary element, (ii) fifth and twelfth rotary elements, and (iii) fourth and tenth rotary elements. Three brakes are provided at (i) the fifth rotary element, (ii) the fourth rotary element, and (iii) seventh rotary element. The input member is connected to the tenth rotary element and the output member is connected to the third coupling element.

Abstract: A multi-stage transmission having eight forward and one reverse gear includes planetary gearsets, shafts and shift elements. The sun gear of gearset (P1) couples shaft (3), which can couple, via brake (03), the housing and couples the ring gear of gearset (P3). The input shaft couples the carrier of gearset (P1) and can couple, via clutch (15), shaft (5), which couples the ring and sun gears of respective gearsets (P2, P3). The ring gear of gearset (P1) couples shaft (6) and the sun gear of gearset (P2). Shaft (8) couples the carrier and sun gear of respective gearsets (P3, P4). Shaft (4) couples the carrier of gearset (P4) and can couple, via brake (04), the housing. The input shaft couples the ring gear of gearset (P4) and, via clutch (27), couples shaft (7), which couples the carrier of gearset (P2). Clutch (56, 67, 57) engages to block gearset (P2).