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 planet carrier mechanism for a planetary gearset is provided to resolve the problems caused by welding during the manufacture of planet carrier mechanisms. The planet carrier mechanism meshes with a sun gear and a ring gear in a planetary gearset and can also rotate about a axial center. It is equipped with a plurality of planet gears 14, a pair of carrier members 16, 17, and a plurality of stud pins 18. The pair of carrier members 16, 17 are disposed on both sides of the planet gears 14 in the axial direction and serve to support the planet gears 14 such that the planet gears can rotate about an axis. The plurality of stud pins 18 is disposed between the plurality of the planet gears 14 with respect to the direction in which the planetary gearset rotates about its axis. Both ends of the stud pins are fixed by caulking to the pair of carrier members 16, 17.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least five forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets, two brakes and two clutches. The powertrain includes an engine and torque converter that is continuously connected to at least one member of the planetary gear arrangement and an output member that is continuously connected with another of the planetary gear members. The two brakes and two clutches provide interconnections between various gear members and with the input, the output shaft, or the transmission housing, in some instances, and are operated in combinations of two to establish at least five forward speed ratios and a reverse speed ratio.

Abstract: A family of multi-speed transmissions with each family member including three planetary gear sets having three members each. The first planetary gear set has a first member continuously interconnected with an input shaft. The third planetary gear set has a first member continuously interconnected with an output shaft. A second member of the first planetary gear set, a first member of the second planetary gear set and a second member of the third planetary gear set are continuously interconnected for common rotation. The first and third planetary gear sets each have one non-continuously interconnected member, and the second planetary gear set has two non-continuously interconnected members. Two stationary torque transmitting mechanisms are provided to each connect one of the non-continuously interconnected members with a stationary portion of the transmission.

Abstract: The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least five forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets, and four torque transmitting mechanisms. The fourth torque transmitting mechanism may be either a brake or a fourth clutch. The powertrain includes an engine and torque converter that is continuously connected to at least one member of the planetary gear arrangement and an output member that is continuously connected with another of the planetary gear members. At least one other planetary gear member is continuously connected with the transmission housing. The three clutches and torque transmitting mechanism provide interconnections between various gear members and with the input, the output shaft, or the transmission housing, in some instances, and are operated in combinations of two to establish at least five forward speed ratios.

Abstract: A multi-speed automatic transmission improves transmission efficiency by reducing drag loss due to high speed rotation of a freely rotating element of a planetary gear set. An automatic transmission for a vehicle includes: an input path T1 of a first speed ratio; an input path T2 which has a larger speed ratio than this input path T1; a planetary gear set of four elements, wherein the four elements are a first element, a second element, a third element, and a fourth element following an order of elements on a speed diagram; a clutch C-2 transmitting a rotation of the input path T2 to the first element S3; a clutch C-1 transmitting the rotation from the input path T2 to the fourth element S2; a clutch C-4 transmitting a rotation from the input path T1 to the first element; a clutch C-3 transmitting the rotation from the input path T1 to the second element C3; a brake B-1 engaging the fourth element; a brake B-2 engaging the second element; and an output member coupled with the third element R3.

Abstract: A vehicle automatic transmission includes an input shaft connected to an output shaft of an engine, an output shaft, and a torque converter for transmitting driving torque from the engine to the automatic transmission. A planetary gear system of the automatic transmission is provided with first, second, third and fourth planetary gear sets. The first gear set has a first sun gear, a first ring gear, a pair of first pinion gears, and a first planetary carrier. The second, third and fourth gear sets respectively have second, third and fourth sun gears, second, third and fourth ring gears, second, third and fourth single pinion gears, and second, third and fourth planetary carriers. The planetary gear system is further provided with four rotational elements, two clutches, and three brakes.

Abstract: A power train for an automotive transmission includes first and second planetary gear sets disposed around an input shaft. The first and second planetary gear sets include a first sun gear, a first planet carrier, and a first ring gear. The second planetary gear set includes a second sun gear, a second planet carrier, and a second ring gear; the first planet carrier being fixedly connected to the second ring gear. The first sun gear is connected to the input shaft with a first clutch interposed between the first sun gear and the input shaft. The second planet carrier is connected to the input shaft with a second clutch interposed between the second planet carrier and the input shaft, and the second sun gear is connected to the input shaft with a third clutch interposed between the second sun gear and the input shaft. The fourth clutch and the second one-way clutch are disposed spaced away from each other in the axial direction of the input shaft.

Abstract: A forward-reverse rotation device for a continuously variable transmission is provided to reduce the manufacturing cost of a forward-reverse rotation device for a continuously variable transmission. A forward-reverse rotation device 2 for a continuously variable transmission is equipped with a planetary gear set 5, a reverse brake 7, and a forward clutch 6. The planetary gear set 5 has a sun gear 11 provided on an input shaft 8, a ring gear 14, double planetary gears 12, and a carrier 13 that axially supports the double planetary gears 12 and serves to output power to output shaft 9. The brake 7 is for allowing and prohibiting the rotation of the ring gear 14. The clutch 6 is a mechanism for coupling and releasing the input shaft 8 to and from the carrier 13. The sun gear 11 and splines 17 are formed integrally on an external circumferential surface of the input shaft 8.

Abstract: A planet carrier mechanism for a planetary gearset is provided to resolve the problems caused by welding during the manufacture of planet carrier mechanisms. The planet carrier mechanism meshes with a sun gear and a ring gear in a planetary gearset and can also rotate about a axial center. It is equipped with a plurality of planet gears 14, a pair of carrier members 16, 17, and a plurality of stud pins 18. The pair of carrier members 16, 17 are disposed on both sides of the planet gears 14 in the axial direction and serve to support the planet gears 14 such that the planet gears can rotate about an axis. The plurality of stud pins 18 is disposed between the plurality of the planet gears 14 with respect to the direction in which the planetary gearset rotates about its axis. Both ends of the stud pins are fixed by caulking to the pair of carrier members 16, 17.

Abstract: A power transmission has a planetary gear arrangement that includes three planetary gear sets. One of the planetary gear sets is a dedicated gear set in that one of the planetary members (reaction member) is continuously connected to a stationary member and another (input member) is continually connected with an input drive member. The dedicated planetary gear set can be arranged to provide either an underdrive or an over drive depending on the input and reaction members. The other two planetary gear sets are disposed in downstream power flow relation to the dedicated planetary gear set and are selectively connectable with both the output member of the dedicated gear set and the input drive member through a plurality of rotating torque transmitting mechanisms and at least one stationary torque transmitting mechanism. The torque transmitting mechanisms are selectively engaged in combinations of two to provide at least seven forward drive ratios and one reverse drive ratio.

Abstract: A clutch arrangement for use in a power tool having a multi-speed transmission assembly. The clutch arrangement includes a clutch member and a follower member. The clutch member is coupled to a member of the transmission assembly that is proximate the torsional input of the transmission assembly and which must be in a non-rotating position to permit the transmission assembly to perform a torque multiplication operation. The follower member is biased into engagement with the clutch member to inhibit relative rotation therebetween. As the clutch member and the transmission member are coupled to one another, the transmission assembly is able to perform a torque multiplication operation. When, however, the torsion that is exerted onto the clutch member is sufficient to overcome the frictional engagement between the follower and clutch members, the clutch member, and the transmission member, rotate, thereby inhibiting the capability of the transmission to continue to perform the torque multiplication operation.

Abstract: The invention provides a linkless steering apparatus for vehicle in which a steering mechanism and steering wheel are not mechanically connected. The steering apparatus drives a steering motor of the steering mechanism in accordance with a steering torque so as to increase or decrease a steering angle. The steering torque for this purpose is calculated based on results obtained by detecting a rotational angle of an electric motor (a reaction-force motor) connected to a rotational shaft of the steering wheel and an electric current flowing to the electric motor, a moment of inertia of the steering wheel, and a moment of inertia of the electric motor. Therefore, it is possible to avoid use of a torque sensor which requires a large space for installation thereof and high cost.

Abstract: An automatic transmission is capable of obtaining appropriate gear ratios for six forward shifts and one reverse shift. The automatic transmission includes a first planetary gear, a second planetary gear, a planetary gear unit including a third planetary gear, and a fourth planetary gear. Also provided are first, second, third and fourth shaft elements, first and second first clutch elements, first, second, and third brake elements, the first clutch element is capable of selectively interconnecting the input shaft and the fourth shaft element. The second clutch element is capable of selectively interconnecting the input shaft and the carrier of the single planetary gear. The first brake element is capable of selectively fixing the first shaft element. The second brake element is capable of selectively fixing the second shaft element. The third brake element is capable of selectively fixing either the sun gear or the carrier of the double pinion planetary gear.

Abstract: A geartrain for an automatic transmission includes a first single planetary gearset having a first element being variably connected to an input shaft, a second element transferring power to a transfer shaft, and a third element being variably connected to the input shaft and selectively connected to said first or said second element, a second single planetary gearset having a first element being fixedly connected to an element of said first single planetary gearset, a second element being variably connected to a transmission housing, and a third element being fixedly connected to another element of the first single planetary gearset and transferring power to a transfer shaft, a third single planetary gearset having a first element being variably connected to said input shaft, a second element being fixedly connected to second single planetary gearset, and a third element transferring power to the transfer shaft, and a plurality of friction members for the above variable connections.

Abstract: A geartrain for an automatic transmission includes a first single planetary gearset having a first element being variably connected to an input shaft and a second element transferring power to a transfer shaft, a second single planetary gearset having a first element being fixedly connected to an element of said first single planetary gearset, and a second element transferring power to a transfer shaft, a third single planetary gearset having a first element being fixedly to an element of said second single planetary gearset, a second element being variably connected to the input shaft, and a third element being fixedly connected to another element of said second single planetary gearset and being variably connected to the transmission housing; and a plurality of friction members for the above variable connections.

Abstract: A transmission gear comprising a fixed gear case, a drive shaft and a driven shaft supported for independent rotation in the gear case and a planetary gear arranged between the drive and driven shafts. The planetary gear comprises a sun wheel that is nonrotatably connected with the drive shaft, a planetary wheel carrier around the sun wheel which is rotated with respect to the sun wheel, at least one planet wheel supported on the planet wheel carrier around the sun wheel and each planet wheel mates with the sun wheel to be rotated thereby. A gear rim rotates with respect to and mates with the planet wheels. An axially displaceable clutch element has a first axial position at which the clutch element couples the planet wheel carrier with the gear case in a torsionally rigid manner and has a second axial position at which the clutch element couples the planet wheel carrier with a driven shaft in a torsionally rigid manner. The clutch element comprises separated but joined together clutch wheels.

Abstract: A transmission assembly having a first, a second, a third, and a fourth planetary gear set is disclosed. The transmission assembly further includes an input shaft which drives the sun gear of the first planetary gear set, a first member which connects the planet carrier of the third planetary gear set and the ring gear of the fourth planetary gear set, and a second member which connects the sun gear of the third planetary gear set to the sun gear of the fourth planetary gear set. The transmission assembly yet further includes a third member which connects the ring gear of the first planetary gear set to (i) the planet carrier of the second planetary gear set and (ii) the ring gear of the third planetary gear set. The transmission assembly still further includes a fourth member which connects the planet carrier of the first planetary gear set to the sun gear of the second planetary gear set and an output shaft driven the planet carrier of the fourth planetary set.

Abstract: An annulus gear for an automatic transmission and method of construction. The annulus gear is a one-piece or monolithic gear having a set of gear teeth formed on an inner surface thereof for operably coupling with a set of planetary gears. A plurality of lugs extend axially from a rearward edge of the annulus gear and cooperate with a plurality of radially extending tangs formed on an adjacent clutch hub for rotatably coupling the annulus gear with an adjacent clutch mechanism. Similarly, a forward edge of the annulus gear has a plurality of reliefs formed therein which are adapted to receive a plurality of tangs radially extending from an adjacent planetary gear set carrier. In this manner, the annulus gear may also be operably coupled to an adjacent planetary gear set.

Abstract: Disclosed is a powertrain used for a 5-speed automatic transmission. The powertrain includes a first compound planetary gearset and a second compound planetary gearset. The first compound planetary gearset comprises first and second simple planetary gearsets having first, second, third and fourth operating elements, while the second compound planetary gear unit comprises third and fourth simple planetary gearsets having fifth, sixth, seventh and eighth operating elements. The fifth and sixth operating elements are variably connected to the second and first operating elements, respectively, and said seventh operating element is fixedly connected to the fourth operating element. Clutches are disposed to variably connect the fifth and sixth operating elements to the second and first operating elements, respectively. Brakes are interposed between the fourth and eighth operating elements and a transmission housing.

Abstract: A powertrain has a planetary gear arrangement with a simple planetary gear set and a compound planetary gear set which are interconnected by a continuous drive connection and are controlled to provide five forward drive ratios, a reverse drive ratio and a neutral condition. A plurality of torque transmitting devices including four clutches and two brakes are engaged in combination of three for each drive ratio. Two of the torque transmitting devices are engaged during the lowest forward drive ratio, the reverse drive ratio and the neutral condition.

Abstract: A planetary transmission has two planetary gear sets, one of which is a simple planetary gear set. The ring gear of the simple planetary gear set is continuously connected with a transmission output shaft. Six fluid-operated friction torque transmitting devices are operable in combinations of three to establish a reverse drive and five forward drive ratios in the two gear sets. The gear sets are continuously interconnected by at least one drive member and are selectively interconnected by one of the torque transmitting devices. Two of the three devices engaged for reverse and first are also engaged in neutral.

Abstract: Disclosed is a powertrain used for a 5-speed automatic transmission. The powertrain includes a first compound planetary gearset and a second compound planetary gearset. The first compound planetary gearset comprises first and second simple planetary gearsets having first, second, third, and fourth operating elements, while the second compound planetary gearset comprises third and fourth simple planetary gearsets having fifth, sixth, seventh, and eighth operating elements. One of the fifth to eighth operating elements are fixedly connected to one of the first to fourth operating elements, one of the fifth to eighth operating elements are variably connected to two of the first to fourth operating elements, and one of the fifth to eighth operating elements operates as an output element. Clutches are disposed to variably connect the operating elements of the first and second compound planetary gearsets.

Abstract: A planetary gear arrangement has two simple planetary gearsets and six selectively engageable friction torque transmitting mechanisms which are controlled to establish five forward transmission ratios and one reverse transmission ratio. One of the planetary gearsets establishes one forward ratio and the reverse ratio. The two planetary gearsets are compounded through both a continuous torque transmitting connection and a selectively engageable drive connection comprised of one of the torque transmitting mechanism during the two lowest forward transmission ratios and through the continuous torque transmitting connection during the highest of the forward transmission ratios. Both planetary gearsets are maintained in a direct drive ratio during the numerically central (third) forward ratio.

Abstract: A powertrain which is used for a 5-speed automatic transmission. The powertrain includes a first compound planetary gearset and a second compound planetary gearset. The first compound planetary gearset comprises first and second simple planetary gearsets having first, second, third, and fourth operating elements, while the second compound planetary gearset comprises third and fourth simple planetary gearsets having fifth, sixth, seventh, and eighth operating elements. The sixth operating element being fixedly connected to the third operating element, and the seventh and eighth operating elements are variably connected to the fourth operating element. Clutches are disposed between the seventh and fourth operating elements, and between the eighth and fourth operating elements. A brake is interposed between at least one of the operating elements of the first and second compound planetary gearsets and a transmission housing.

Abstract: An automatic variable transmnission, and a hydraulic pressure control system for the same, have a structure which can be installed in both rear and front wheel drive vehicles.

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

Abstract: A planetary gear transmission comprises first, second and third planetary gear trains G1, G2 and G3 which are disposed coaxially with one another and respectively in this order from an input member. The first and second ring gears R1 and R2, which are fixedly retainable by a first brake B1, are disengageably connected to the input shaft 1 through a first clutch K1. The first sun gear S1 is also disengageably connected to the input shaft 1 through a third clutch while the first carrier C1 and the second sun gear S2 are connected to the output shaft 7. Furthermore, a connecting shaft 4 is disposed away from and in parallel with the axis of the first, second and third planetary gear trains G1, G2 and G3, and one end of the connecting shaft is connected to the input shaft 1 through a first connecting gear train 2 and 3 while the other end of the connecting shaft is connected to the third sun gear S3 through a second connecting gear train 5 and 6.

Abstract: A two-axis Cartesian robot comprising a vertically disposed Y-axis support having a traverse carriage selectively vertically movably mounted thereon. An X-axis support is movably mounted on the carriage. A reversible drive motor is mounted on the carriage and has a driven shaft extending therefrom upon which is mounted a planetary gear drive including an X-axis drive gear and a Y-axis drive gear which are in engagement with gear racks on the X-axis and Y-axis supports, respectively. A Y-axis brake is provided for selective engagement with the Y-axis drive gear for selectively preventing rotation of the Y-axis drive gear and an X-axis brake is provided for selective engagement with the X-axis drive gear for selectively preventing rotation of the X-axis drive gear. A workpiece manipulator is secured to the X-axis support for movement therewith.

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 fourth operating elements. The first operating element acts 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 acts as an output element and the sixth and eighth operating elements are variably connected to the first and fourth operating elements, respectively. The seventh operating element is fixedly connected to the third operating element. Clutches are provided for variably connecting the sixth and eighth operating elements to the first and fourth operating elements, respectively. Brakes are provided for selectively connecting the second and eighth operating elements to a transmission housing.

Abstract: A planetary transmission is disclosed including a front section having a first, a second, and a third planetary gear set each having a sun gear, a planet carrier and a ring gear. An input shaft is connected to at least two of the sun gears and the carrier of the third planetary gear set serves as the output. The front section of the transmission is operatively connected to a rear section for multi-speed use particularly adaptable to trucks or other machines.

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

Abstract: A simple planetary gearset, a compound pinion planetary gearset, two clutches and two brakes are combined to provide four forward speed ratios and a reverse ratio. One of the clutches provides an input connection while the other provides a planetary interconnection. The two brakes are connected with respective first and second members of the simple planetary gearset while the third member of the planetary is continuously driven by a power input. The compound pinion planetary gearset has one member continuously connected with a power output shaft, a second member connected with the input clutch and the interconnecting clutch, and a third member connected with one of the brakable members of the simple planetary gearset.

Abstract: A bicycle transmission includes a shaft, a driving part supported about the shaft for coupling to the input part, a driven part supported about the shaft for coupling to the output part, and a planetary gear mechanism disposed between the driving part and the driven part for changing the transmission ratio of the motive force applied from the driving part to the driven part. The planetary gear mechanism comprises a sun gear installed about the shaft, an output gear for transmitting motive force to the driven part, a frame part installed about the shaft and coupled to the driving part, and a planetary gear rotatably coupled to the frame part and disposed between the sun gear and the output gear for engaging the sun gear and the output gear. A clutch comprising a roller is disposed at an intermediate point along the transmission path between the driving part and the driven part for transmitting the motive force from the driving part to the driven part in one direction only.

Abstract: A kinematic arrangement of an automatic transmission includes three simple planetary gear units having certain elements fixed to other elements mutually, a one-way coupling for holding the ring gear of the first gear unit against rotation, brakes for holding the carrier of the third gear unit and the sun gears of the second and third gear units against rotation on the transmission housing, two friction clutches arranged in parallel between the input shaft and the sun gears of the second and third planetary gear units, a brake band for holding the ring gear of the third gear unit and carrier of the second gear unit against rotation, and a friction clutch for holding the sun gear of the first gear unit against rotation.

Abstract: A kinematic arrangement of a multiple-speed automatic transmission for an automotive vehicle includes a simple planetary gear unit and a compound planetary gear unit, hydraulically actuated clutches and brakes applied and released selectively, and an overrunning clutch that produces a one-way drive connection between the carrier of the first gear unit and a nonrotating member such as the transmission casing. The simple planetary gear unit includes a sun gear, a ring gear surrounding the sun gear, a carrier, and a set of planet pinions in continuous meshing engagement with the sun gear and ring gear and rotatably supported on the carrier. The compound gear unit includes a sun gear, a ring gear surrounding the sun gear, a carrier, a first set of planet pinions in continuous driving engagement with the sun gear, and a second set of planet pinions in continuous engagement with the ring gear and the first set of planet pinions.

Abstract: An automatic transmission for passenger cars has input and output shafts in alignment, three planetary gearsets, first, second and third control clutches and first and second control brakes, and can be coupled to a torque converter with or without a lock-up clutch. Five forward gears and a reverse drive are provided, with excellent ratio progression and high design versatility. As a rule, a direct drive available between third and fourth gears is not used. A first one-way clutch can be added in parallel with the first control brake to facilitate first/second and second/first power-on gearshifts. A second one-way clutch can be added in parallel with the second control clutch to facilitate fourth/fifth and fifth/fourth power-on gearshifts, without requiring an additional control clutch to be mounted in series to release it in other gears. The transmission is remarkably compact and can easily be substituted for existing four-speed transmissions.

Abstract: An automatic transmission includes first and second planetary gear sets, and a third planetary gear set which is closer to an output end of the transmission, and which is smaller in diameter than the first and second gear sets. One brake is disposed around the first and second planetary gear sets, and another brake has a pack of brake plates surrounding the smaller third planetary gear set. A transmission case is therefore made gradually smaller toward the output end. This planetary gear system makes it possible to arrange the brakes very compactly, and the tapered transmission case improves the rigidity of the automatic transmission.

Abstract: An automatic transmission for an automotive vehicle includes first and second simple planetary gear units, certain of whose elements are continually interconnected and certain others are releasably connected through operation of friction elements and one-way couplings. The input shaft of the transmission is adapted to drive elements of the planetary gear units through an underdrive gearset and an overdrive gearset. The various speed ratios result by either underdriving or overdriving an element of the planetary gear unit or both underdriving one element and overdriving another element. Several parallel torque delivery paths include a series arrangement of the overrunning coupling in parallel with a friction element. This arrangement permits engine braking during coast conditions when the coupling overruns. The overdrive gearset is available to produce a speed ratio without involving the planetary gear units.

Abstract: An automatic transmission includes a planetary gear system which are coaxially mounted on an intermediate shaft having a first end supported by an input shaft and a second end supported by an output shaft. For example, the planetary gear system includes three planetary gear sets which are all mounted on the intermediate shaft, and an engaging device group includes a combination of first and second clutches and a first brake which are all placed around the input shaft, and a combination of second and third brakes which are placed around the planetary gear sets. The three planetary gear sets are tightly arranged, leaving little or no intervening spaces, between both ends of the intermediate shaft. No clutches and brakes are interposed among the planetary gear sets. Therefore, it is possible to decrease the length of the intermediate shaft, and to reduce gear noises by improving the flexural rigidity of the intermediate shaft.

Abstract: An improved planetary gear type transmission mechanism is provided which is capable of realizing a plurality of desired speed ratios in a wide range, for example in an automatic transmission, and which maintains gear ratios of all of a plurality of planetary gear sets in an available range. The transmission mechanism includes a double pinion type planetary gear set.

Abstract: A multispeed automatic transmission for automobile vehicles having parallel input shaft output shaft includes two parallel gearsets and of constant-mesh gearwheels providing two fixed speed ratios. The second speed ratio is higher than the first speed ratio and in same direction. A first power path using the first fixed speed ratio includes a first control clutch and a second control clutch, and a second power path using the second fixed speed ratio includes a third control clutch. Further, the transmission includes a double planetary gearset, a first control brake and a second control brake. Alternatively, the input shaft and output shaft are in alignment and one of the two speed ratios is a direct drive. The transmission features six forward speeds, a braked neutral and a reverse drive.

Abstract: A power transmission has three countershaft gear sets which provide selective input members for a pair of interconnected simply planetary gear arrangements. The planetary gear arrangements have the sun gears interconnected, a ring gear and a carrier interconnected, another carrier connected with a transmission output shaft and another ring gear connected with one of the transfer gear sets. The other two transfer gear sets are connected with respective ones of the interconnected members. A plurality of selectively engageable clutches and brakes are arranged to establish input and reaction members for the planetary gear arrangement to provide six forward speed ratios and one reverse speed ratio.

Abstract: In an automatic transmission for a vehicle having an input rotational member, an output rotational member, a rotational speed change gear mechanism, clutches and brakes for changing a route of transmittance of torque between the input rotational member and the output rotational member through the rotational speed change gear mechanism in accordance with selective engagement and disengagement of the clutches and brakes so as to provide a plurality of forward speed stages and a reverse stage, a first one of the clutches is constructed to house a second one of the clutches at a radially inside thereof with a piston member of the first clutch serving as a member for transmitting torque through the second clutch, the second clutch being never engaged immediately after disengagement of the first clutch under any operating condition of the vehicle.