Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and one fixed interconnection. Also, one planetary gear member is continuously connected with the transmission housing. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members and with the transmission housing, and are operated in combinations of three to establish at least seven forward speed ratios and one reverse speed ratio.

Abstract: A sun gear apparatus includes an axle, a sun gear rotatably supported around the axle, and a sun gear guide ring disposed between an inner peripheral surface of the sun gear and the axle. The sun gear guide ring minimizes or eliminates looseness in the coupling between the sun gear and the axle.

Abstract: A speed-reducing gear unit is provided for causing a reduced-speed rotation output member to have a reduced rotation that is slower than rotation of an input shaft. The reduced-speed rotation output member is switched between a reduced-speed rotation state and a free rotation state by rotation state switching means. The reduced-speed rotation of the reduced-speed rotation output member is selectively transferred to fourth and first elements of a speed-changing dual planetary gear unit via first and third control clutches. The rotation of the input shaft is transferred to a second element via a second control clutch. Rotations of the first and second elements are selectively restricted by first and second control brakes. A third element is connected to an output shaft.

Abstract: A powertrain has a planetary gear arrangement that is controllable to establish six forward speed ratios and one reverse ratio through the selective engagement of six torque transmitting mechanisms. The planetary gear arrangement includes three sun gear members, a ring gear member and a planet carrier assembly member having groups of three intermeshing pinion gear members axially arranged in three gear mesh planes. A first of the gear mesh planes has a sun gear member/pinion gear member mesh, a pinion gear member/pinion gear member mesh, and a ring gear member/pinion gear member mesh. A second of the gear mesh planes has a sun member/pinion gear member mesh, and at least one pinion gear member/pinion gear member mesh. A third of the gear mesh planes has a sun gear member/pinion gear member mesh. The ring gear member is continuously connected with a transmission output shaft.

Abstract: A multiple speed transmission for motor vehicles includes three simple planetary gearsets, and hydraulically actuated friction clutches and brakes for controlling operation of the gearsets and altering the torque delivery path between an input shaft and an output shaft. A friction brake is provided for operation in reverse drive to share the torque reaction with another friction brake. The transmission is suited to produce six or seven forward speed ratios and a reverse drive ratio.

Abstract: The present invention aims at realizing with a simple structure a differential gear capable of arbitrarily producing a difference in speed of rotation between output side rotary members. When a difference in speed of rotation occurs between drive shafts 3 and 4, if clutches 12 and 17 are disconnected, a first input side sun gear 8 and a first output side sun gear 9 are allowed to rotate at arbitrary speed ratios independently of each other due to the rotation and the revolution of first planetary gears 10, besides a second input side sun gear 13 and a second output side sun gear 14 are allowed to rotate at arbitrary speed ratios independently of each other due to the rotation and the revolution of second planetary gears 15. When the first clutch 12 for example is brought into connection, the revolution of the first planetary gears 10 is controlled.

Abstract: A geartrain for a five-speed automatic transmission includes first and second compound planetary gear units. The first compound planetary gear unit includes first and second simple planetary gearsets having first, second, third and third operating elements, the first operating element acting as an input element. The second compound planetary gear unit includes third and fourth simple planetary gearsets having fifth, sixth, seventh and eighth operating elements, the fifth operating element acting as an output element, the fifth and sixth operating elements being variably connected to the second and first operating elements, respectively, and the eighth operating element being fixedly connected to the third operating element. Clutches are provided for variably connecting the fifth and sixth operating elements to the second and first operating elements, respectively. Brakes are provided for selectively connecting the first and seventh operating element to a transmission housing.

Abstract: A speed change gear mechanism of an automatic transmission comprising first, second and third planetary gear units each including a sun gear, a ring gear, a single pinion meshed with both the sun gear and the ring gear and a pinion carrier for carrying the pinion. The pinion carrier of the first unit is united with the ring gear of the third unit. The ring gear of the second unit is united with the pinion carrier of the third unit. A first clutch is arranged between the ring gear of the first unit and the ring gear of the second unit. A second clutch or direct connecting member is arranged between the sun gear of the second unit and the sun gear of the third unit. A third clutch is arranged between the sun gear of the third unit and the pinion carrier of the third unit. A first brake is used for stopping rotation of the ring gear of the second unit and the pinion carrier of the third unit which are united. A second brake is used for stopping rotation of the sun gear of the first unit.

Abstract: An automatic transmission having five forward speed ranges and a single reverse speed range wherein a fluid torque converter connected to a crankshaft of an engine increases the rotary torque of the engine and transferring the increased rotary torque to a planetary gear unit installed next to the fluid torque converter. The planetary gear unit includes: a first, a second and a third planetary gear set; and changes the rotary torque, rotary speed, and rotational direction of the power transferred from the fluid torque converter. Friction elements connect and lock the planetary gear sets to the driven shafts, and are controlled with a hydraulic control system. The hydraulic control system controls the fluid path by a shift lever, according to the speed and load of the vehicle.

Abstract: In a carrier connecting structure for an automatic transmission having a brake 6 that brakes and releases a rotating member 6a by oil pressure and a planetary gear mechanism 5 having a carrier 5e supporting a planetary gear train 5d, a fixing section 5i having fixing surfaces 5g, 5h oriented in a perpendicular direction and a circumferential direction relative to a shaft line is provided on the outer circumference of this carrier 5e, a flange 6d having fixing surfaces 6b, 6c which come in contact with the fixing surfaces 5g, 5h projects from the rotating member 6a, and the fixing section 5i of the carrier 5e and the flange 6d of the rotating member 6a are fixed by a screw member 9. Thus, the automatic transmission carrier connecting mechanism is easy to assemble and highly reliable.

Abstract: An automatic transmission for a motor vehicle comprises (a) an input shaft (26), (b) a compound planetary gear set (40) coaxially mounted about the input shaft (26) for rotation therewith, the compound planetary gear set (40) operable under control of a reduced number of clutches and brakes to establish first to fourth forward drive ratios, (c) an output shaft (28) lying in parallel with the input shaft (26), (d) a simple planetary gear set (70) coaxially mounted about the output shaft (28) for rotation therewith, the simple planetary gear set (70) operable to provide fifth forward drive ratio by way of further increasing the pre-established fourth ratio, and (e) a chain (60) and sprocket coupler (54, 56) for delivering rotaty power from the compound planetary gear set (40) to the simple planetary gear set (70). As an alternative, the chain (60) and sprocket coupler (54, 56) may be replaced with drive and driven transfer gears which are kept in a mutually meshing relationship.

Abstract: 056431307A disclosed power train of an automatic transmission for a vehicle, which includes a device for making a continuous shifting operation in the low speed region, directly connecting the power train with the output shaft of the engine so as to reduce the shifting shock impulses, and reducing the number of the one-way clutches so as to simplify the whole structure.

Abstract: A stepless automatic variable transmission with gears in a state of constant meshing which is operational without the need for disengaging or changing the gears such that the rotational output power can be varied to effect a neutral, low speed, medium speed, high speed, overdrive or reverse rotation by selecting a stepless automatic speed change method or a manual speed change method, and which includes a speed change system, an overdrive system and a speed change controlling system.The assembly of speed change system (10, 110, 310, 410, 510, 610), the overdrive system (50, 360, 660, 760) and the speed change controlling system (80, 180, 380, 680, 780) can vary with each of the systems combined to result in numerous stepless automatic variable transmissions. To effect speed changes low speed, medium speed, overdrive, and reverse rotation brake means are used. Also, either the manual speed change method or the automatic speed change method can be selected.

Abstract: A planetary gear transmission typically for use on automobiles has first, second, and third planetary gear trains arranged coaxially with each other and each having elements including a sun gear, a carrier, and a ring gear. Two of the elements of each of the first, second, and third planetary gear trains are directly or disengageably coupled to elements of the other planetary gear trains. The transmission also has three clutch means and two brake means for selectively establishing a power transmitting path from an input shaft to an output gear member through the first, second, and third planetary gear trains. At least one of the first, second, and third planetary gear trains comprises a double-pinion planetary gear train, one of the sun gear and the carrier of the double-pinion planetary gear train being coupled to the input shaft and the other being nonrotatably fixed.

Abstract: An automatic transmission includes first and second multi-step or speed transmissions mounted in parallel with each other with respect to a transmission shaft. The multi-step or speed transmissions are operationally coupled by a counter gear for transmitting engine torque from the first multi-step or speed transmission to the second multi-transmission. An extension unit having friction clutch elements is detachably coupled to the first multi-step or speed transmission for changing a transmission path of the engine torque through it. The number of shiftable gear ratios of the automatic transmission, therefore, can be increased.

Abstract: A multiple speed ratio transmission for use in the driveline of an automotive vehicle includes a hydrokinetic torque converter and three interconnected planetary gear units, several one-way clutches and brakes, friction clutches and friction brakes. The engaged and release state of the friction elements permits the transmission to produce several underdrive speed ratios, a direct drive ratio, an overdrive ratio and reverse drive.

Abstract: A planetary gear transmission typically for use on automobiles has first, second, and third planetary gear trains arranged coaxially with each other and each having elements including a sun gear, a carrier, and a ring gear. Two of the elements of each of the first, second, and third planetary gear trains are directly or disengageably coupled to elements of the other planetary gear trains between input and output members. The elements of the first, second, and third planetary gear trains are corotatably coupled into first, second, third, fourth, and fifth rotational members the first, second, and fifth rotational members being coupled to the input member, the fourth rotational member being coupled to the output member. The planetary gear transmission also has a separating clutch disposed between the elements of the second rotational member, for disengageably connecting the elements of the second rotational member.

Abstract: A transmission has a pair of parallel shafts, a first shaft being connected through a torque converter with a vehicle engine and a second shaft carrying an output gear which is adapted to engage with a differential unit for the front wheel drive axle. The first shaft is provided with a first gear system thereon which includes one or more planetary gearsets, and the second shaft is provided with a second gear system thereon which includes a planetary gearset. A sun gear constituting the planetary gearset of the second gear system is integrally provided on the second shaft so that it can rotate together with the second shaft. A brake and a one-way clutch for controlling the action of this planetary gearset are provided between the second shaft and the case in such a manner that the brake can restrict the rotation of the second shaft, and that the one-way clutch can prohibit the rotation of the second shaft in one direction. The output gear is carried rotatably on the second shaft.

Abstract: An automatic transmission which includes a device for selecting and temporarily setting such one of other speed stages, if any, between a present speed stage and a target speed stage as can have a small number of fluctuating revolutions of rotary members of planetary gear sets of the automatic transmission and two or less frictional engagement elements to be switched.

Abstract: A speed changing gear device for an automatic transmission, comprising a main gear assembly for providing a plurality of operating positions, and an auxiliary gear assembly for providing a direct drive position and a speed changing drive position. The main gear assembly includes a single-pinion type first planetary gear unit having a first sun gear, a first planetary gear, a first ring gear and a first carrier, and a single-pinion type second planetary gear unit having a second sun gear, a second planetary gear, a second ring gear and a second carrier. The auxiliary gear assembly includes a third planetary gear unit having a third sun gear, at least one third planetary gear, a third ring gear and a third carrier. The first carrier and second ring gear are fixed to each other, or selectively connected to each other by a first clutch. The first and second sun gears, and the first sun gear and second carrier are selectively connected to each other by a second and a third clutch, respectively.

Abstract: An automatic transmission having multiple planetary gear elements adapted to establish and disestablish plural torque delivery paths between a driving member and a driven member, and releasable couplings adapted to connect selected gear elements of the transmission to ground and to connect two of the elements together to effect nonsynchronous ratio changes in the transmission without the necessity of engaging and releasing in timed sequence friction clutches and friction brakes, whereby friction torque losses are reduced and ratio changes in the transmission have a high degree of smoothness.

Abstract: A shift control system for use in an automatic transmission which comprises: a plurality of frictional engagement components; and a gear train adapted to set a plurality of speed stages having different gear ratios in accordance with the combination for engagement/release of the frictional engagement components and enabled to select a combination for engaging and releasing any of the frictional engagement components as that for engagement/release of the frictional engagement components for setting any of the speed stages.

Abstract: A speed changing gear device for an automatic transmission, comprising a main gear assembly for providing a plurality of operating positions, and an axiliary gear assembly for providing a direct drive position and a speed changing drive position. The main gear assembly includes a single-pinion type first planetary gear unit having a first sun gear, a first planetary gear, a first ring gear and a first carrier, and a single-pinion type second planetary gear unit having a second sun gear, a second planetary gear, a second ring gear and a second carrier. The auxiliary gear assembly includes a third planetary gear unit having a third sun gear, at least one third planetary gear, a third ring gear and a third carrier. The first carrier and second ring gear are fixed to each other, or selectively connected to each other by a first clutch. The first and second sun gears, and the first sun gear and second carrier are selectively connected to each other by a second and a third clutch, respectively.

Abstract: An automatic transmission wherein a gear train is constituted by three single pinion type planetary gear sets, provided with a first planetary gear set having a first sun gear, a first ring gear, and a first carrier holding pinion gears meshing with the first sun gear and the first ring gear, a second planetary gear set having a second sun gear, a second ring gear which is normally or selectively connected with the first carrier, and a second carrier holding pinion gears meshing with the second sun gear and the second ring gear, a third planetary gear set having a third sun gear normally or selectively connected to the second carrier, a third ring gear which is continuously connected with the first carrier, and a third carrier holding pinion gears meshing with the third sun gear and the third ring gear and connected to the output shaft, a first clutch means which selectively connects the input shaft and the first ring gear, a second clutch means which selectively connects the first sun gear and the second car

Abstract: The present gear arrangement for an automatic transmission includes one compound planetary gear unit and two simple planetary gear units. Three clutches and three brakes are selectively engaged to produce five forward and two reverse drive ratios.

Abstract: A shift control system for an automatic transmission comprises: a gear train including a plurality of planetary gear sets having rotary components, an input shaft and an output shaft; a plurality of clutches for selectively connecting either the rotary components of the planetary gear sets with each other or the rotary components and the input shaft; and a plurality of brakes for holding the rotary components selectively in immovable states, any one of the planetary gear sets being adapted to take no part in the transmission of torque at one gear stage.

Abstract: A planetary gear device having a first and a second single-pinion planetary gear unit and a third double-pinion planetary gear unit, which are coaxially disposed so as to provide different speed reduction ratios. The three gear units have respective first, second and third sun gears, respective first, second and third ring gears, and respective first, second and third carriers rotatably supporting planetary pinions. The first and second sun gears are fixed together or selectively connectable to each other, and the first carrier, second ring gear and third carrier are fixed together or selectively connectable to each other. Further, the second carrier and the third sun gear are fixed together or selectively connectable to each other. The present arrangement allows shifting operations of the gear device, without concurrent disengagement and engagement of different clutches.

Abstract: A gear train for changing the rotational speed of an input shaft to transmit the resultant rotation to an output shaft consists of single pinion type first and third planetary gear sets and a double pinion type second planetary gear set. Ring gears of these three planetary gear sets are normally or selectively interconnected to each other, a carrier of the first planetary gear set is normally or selectively connected to a sun gear of the third planetary gear set, a sun gear of the first planetary gear set is normally or selectively connected to a sun gear of the second planetary gear set, and the sun gear of the second planetary gear set is normally or selectively connected to the carrier of the first planetary gear set, whereby at least five forward speeds and one reverse are permitted to be set.

Abstract: A first and a second rotary member such as outside or inside clutch member arranged as axially juxtaposed and radially expanded to rotate individually about a common axis in a transmission for a vehicle are separately torque-transmittingly connected with a first shaft member and a hollow second shaft member coaxially and telescopingly disposed around the first shaft member to be respectively in an individually torque-transmitting relationship by first external splines formed at an outer periphery of an end portion of the first shaft member axially extending out of an open end of the second shaft member being axially placed into engagement with first internal splines formed at an inner periphery of a central bore formed in the first rotary member, while second external splines formed at an outer periphery of an end portion of the second shaft member adjacent the open end thereof are axially placed into engagement with second internal splines formed at an inner periphery of a central bore formed in the second r

Abstract: A gear train for transmitting the rotation from an input shaft to an output shaft is constituted such that a plurality of speeds are set by a plurality of planetary gear sets, each of which is provided with components including a sun gear, a ring gear and a carrier, and one of the planetary gear sets on one of the speeds does not participate in the transmission of torque from the input shaft to the output shaft. Also, single or a plurality of uniting clutches are provided to selectively interconnect at least either two of the components in the planetary gear set adapted not to participate in the transmission of torque.

Abstract: An automatic transmission, in which a gear train including a plurality of planetary gear sets each composed of a sun gear, a carrier and a ring gear is accommodated in a casing so that the transmission of a drive force from an input shaft to an output shaft may be changed to set a plurality of gears. The automatic transmission includes a first brake connected to the carrier of the first one of the plural planetary gear sets for fixing the same to the casing; a first clutch arranged at the same side as is the connecting position of the carrier and the first brake means with respect to the first planetary gear set for connecting the carrier selectively to a rotating member such as the sun gear, carrier or ring gear of one of other planetary gear sets; and a second clutch arranged closer to the first planetary gear set than it is to the first clutch for connecting the sun gear of the first planetary gear set selectively to the rotating member.

Abstract: A gear train for changing the rotational speed of an input shaft to transmit the resultant rotation to an output shaft consists of single pinion type first and second planetary gear sets and a double pinion type third planetary gear set.

Abstract: A speed changing gear device for a motor vehicle, including a first and a second single-pinion type planetary gear unit and a third double-pinion planetary gear unit, which are coaxially disposed so as to provide different speed reduction ratios. The three gear units have respective first, second and third sun gears, respective first, second and at least one pair of planetary pinions, respective first, second and third ring gears, and respective first, second and third carriers. The first and third ring gears are fixed to each other for rotation as a unit, or connectable to each other by clutch means. The first sun gear and the second ring gear are fixed to each other or connectable by clutch means. The second and third carriers are fixed to each other or connectable to each other by clutch means. The second and third sun gears are fixed to each other or connectable by clutch means.

Abstract: An automatic transmission having a gear train comprising first, second and third single-pinion planetary gear sets. The ring gear of the first single-pinion planetary gear set is connected integrally or selectively to the carrier of the second single-pinion planetary gear set, the carrier of the first single-pinion planetary gear set is connected integrally or selectively to the ring gear of the third single-pinion planetary gear set is connected integrally or selectively to the carrier of the third single-pinion planetary gear set, and the sun gear of the second single-pinion planetary gear set is connected integrally or selectively to the sun gear of the third single-pinion planetary gear set. The automatic transmission is capable of being placed in any one of at least five forward gears and one reverse gear.

Abstract: A gear train for changing the rotational speed of an input shaft to transmit the resultant rotation to an output shaft consists of single pinion type first and third planetary gear sets and a double pinion type second planetary gear set. A sun gear of the first planetary gear system is normally or selectively connected to a carrier of the third planetary gear set, the carrier of the third planetary gear set is normally or selectively connected to a sun gear of the second planetary gear set, a carrier of the first planetary gear set is normally or selectively connected to a ring gear of the third planetary gear set, a ring gear of the first planetary gear set is normally or selectively connected to a ring gear of the second planetary gear set, the sun gear of the second planetary gear set is normally or selectively connected to a sun gear of the third planetary gear set, whereby at least five forward speeds and one reverse are permitted to be set.

Abstract: An automatic transmission including gear trains, which are constructed of at least three planetary gear sets each having three rotating members. A first clutch is arranged closer to an input shaft than the first planetary gear set for connecting any one of the rotating members of the first planetary gear set arranged adjacent to the input shaft. A second clutch is also arranged closer to the input shaft than the first planetary gear set for connecting another of the rotating members of the first planetary gear set and the input shaft. A third clutch is interposed between the first planetary gear set and the second planetary gear set for connecting any one of the rotating members of the second planetary gear set arranged at the opposite side to the input shaft across the first planetary gear set and the any one or the another of the rotating members of either one of the first clutch and the second clutch or the first planetary gear set.

Abstract: A power transmission has a planetary gear arrangement controlled by a plurality of selectively engageable clutches and brakes to provide forward and reverse speed ratios. A selectively operable input gear arrangement is utilized to establish a negative ratio of substantially 1:1 between the transmission input and the planetary gear arrangement. The selective use of the negative ratio input permits substantially equal forward and reverse drive ratios. The negative ratio input arrangement also permits extended coverage when employed with some of the other forward ratios established by the planetary gear arrangement.

Abstract: A vehicle transmission including a first, a second and a third planetary gear unit coaxially disposed between an input and an output member. The three units have respective first, second and third sun gears, respective first, second and third planetary gears, respective first, second and third carriers, and respective first, second and third ring gears. The first carrier, second ring gear, third sun gear and output members are connected to each other, while the second carrier and the third ring gear are connected to each other.

Abstract: A planetary gearing for an automatic transmission comprises a main and auxiliary planetary gearings which are operatively coupled with each other. The auxiliary planetary gearing has a reduction drive state and a direct drive state and it shifts from the reduction drive state thereof to the direct drive state thereof when the main planetary gearing state has shifted up to the n-1 speed state thereof, where n is an integer not less than four. The main planetary gearing has n forward speeds.