Abstract: An improved gear transmission (10) includes a one-way clutch (52) for connecting together selectively two drive elements to establish a plural torque flow path through the transmission (10) and the clutch (52) includes at least one inner race (52B) and one outer race (52A), each of the races having coaxial inner and outer race portions, the outer surface (112) of the outer race portion (52B) defined by a first undulating surface, the inner surface (113) of a mating drive element defined by a second undulating surface in conjugate registration with the first undulating surface, the profiles of the first and second undulating surfaces (112,113) being controlled to provide a controlled clearance therebetween reducing shock loading at the interface of the inner and outer race portions through a gradual lock-up through a controlled wind-up of the mating members and reducing vibration in the gear elements.

Abstract: A double-acting hydraulic actuator structure for use in an automatic transmission has a two-layered structure which includes first and second frictional engagement element hydraulic actuators. The first hydraulic actuator includes a drum member and a first piston fitted hermetically and slidably in the drum member. The second hydraulic actuator is formed by the interior of the first piston and a second piston fitted hermetically and slidably mounted within the first piston. The first and second pistons are both urged toward their disengaged positions by the action of a common return spring. A second spring is provided for urging the second piston alone against the force of the return spring.

Abstract: A planetary gear type transmission mechanism reduces frictional resistance at all forward speed ratio. The transmission mechanism includes an input shaft, an output shaft, a first planetary gear set, a second planetary gear set and a friction means. The friction means includes a plurality of friction elements for determining power transmission route through at least one of the first and second planetary gear sets for establishing a plurality of forward speed ratios. At any forward speed ratio all gear elements of the first and second planetary gear sets except for the gear elements integrally coupled with the output shaft rotate in the same direction as that of the input shaft at speed less than the input shaft.

Abstract: A transaxle for use in an automotive vehicle driveline includes a torque converter and a compound planetary gear system having two simple planetary gear units adapted to provide four forward driving torque delivery paths, the highest speed ratio path being an overdrive, the axis of the torque converter being located on the crankshaft axis of the vehicle engine, and a torque output shaft being parallel to the torque converter and engine axis. Hydraulically actuated friction clutches and brakes and one-way couplings interconnect the input and output of the transmission to members of the planetary gearset and the transmission casing. A final drive planetary gearset, driven by the output of the planetary gear units, drives a differential mechanism connected to the axle shaft of the vehicle.

Abstract: A planetary gear system has seven members rotatable relative to one another, one stationary member, and five selective engaging devices each disposed between two of the members. Each member contains one or more of elements which are input and output elements, a stationary element, and a plurality of active elements, such as sun gears, ring gears, and planet carriers, constituting a planetary gear arrangement connected between the input and output elements for providing a plurality of forward gear ratios and at least one reverse gear ratio. With the eight members and the five selective engaging devices, the planetary gear system makes it possible to attain desired gear ratio values for all the speeds.

Abstract: A transaxle for use in an automotive vehicle driveline includes a torque converter and a compound planetary gear system having three simple planetary gear units adapted to provide five forward driving torque delivery paths, the two highest speed ratios being overdrive, the axis of the torque converter being located on the crankshaft axis of the vehicle engine, and a torque output shaft being parallel to the torque converter and engine axis. Hydraulically actuated friction clutches and brakes and one-way couplings interconnect the input and output of the transmission to members of the planetary gearing and the transmission casing. A final drive planetary gearset, driven by the output of the planetary gear units, drives a differential mechanism connected to the axle shaft of the vehicle.

Abstract: A shaft connected to a component of a planetary gearset is driveably connected by a coupling to alternate friction elements in accordance with the relative speeds of the coupling members and the direction of rotation of the driven coupling member. The coupling includes a radially inner one-way coupling and an outer one-way coupling, the outer race of the inner coupling and inner race of the outer coupling being the intermediate race, which is connected to the gearset. The inner race and outer race have cam surfaces contacting roller clutch elements located in a cage and spaced mutually about the coupling axis. The cam surfaces of the races are inclined with respect to the adjacent surface of the intermediate race in opposite directions, so that when one coupling drives, the other coupling overruns.

Abstract: An automatic transmission includes a plurality of frictional engagement means and a gear train including a plurality of rotary members and adapted to be set to a plurality of speeds of different gear ratios in accordance with the engagement/disengagement statuses of the frictional engagement means. The gear train has a plurality of kinds of combination patterns of engagement/disengagement of the frictional engagement means for setting a predetermined speed and the number of revolutions of any of its rotary members can vary according to which of the engagement/disengagement patterns is selected. Speed control means is provided for selecting one of the combination patterns of the frictional engagement means for setting the predetermined speed so as to decrease the fluctuating number of revolutions of the rotary members.

Abstract: A shift control system and a system control method for use in an automatic transmission includes: an input shaft, an output shaft, a gear train including a plurality of revolving components and arranged between the input shaft and the output shaft, a plurality of clutches for connecting either the input shaft and any of the revolving components or the revolving components selectively, a plurality of brakes for stopping revolution of the revolving components selectively, and a one-way clutch belonging to any of the clutches and the brakes. Any of the speed stages is set according to at least two of a combination pattern of engagement/release of the clutches and brakes for engaging the one-way clutch and a combination pattern of engagement/release of clutches and brakes for releasing the one-way clutch. The combination patterns are always selected so as to switch the one way clutch.

Abstract: A planetary gear type multistage transmission is shown which comprises a first planetary gearset, a second planetary gearset, an input shaft and an output shaft. A pinion carrier of the second planetary gearset is united with a pinion carrier of the first planetary gearset. The input shaft is united with the pinion carrier of the second planetary gearset. The output shaft is united with an internal gear of the first planetary gearset. A first clutch is employed for selectively engaging the sun gear of the first planetary gearset with the pinion carrier of the same. A second clutch is employed for selectively engaging the sun gear of the first planetary gearset with the pinion carrier of the second planetary gearset. A th ird clutch is used for selectively engaging the pinion carrier of the second planetary gearset with the internal gear of the same. A first brake is employed for selectively braking the sun gear of the first planetary gearset.

Abstract: A multispeed power transmission has a plurality of forward speed ratios, the lowest of which is provided by two planetary gear sets that are compound. One of the planetary gear sets is effective during the low ratio only while the other is effective in more than one forward ratio.

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: The present invention is directed to a five-speed, epicyclic transmission assembly having a compound planetary gear set encased in a common housing. Each planetary gear set has a sun gear and a ring gear. A plurality of pinion gears are operatively supported from a common carrier. The sun gears and ring gears of the two planetary gear sets are compounded by the operation of the pinion gears presented from the common carrier. Six, torque transfer devices are utilized. At least two of the torque transfer devices are input clutch members which selectively connect the input means to predetermined components of the planetary gear sets, and at least two of the torque transfer devices are reaction brake members that selectively ground predetermined components of the planetary gear sets to the housing. The sun gear in one of said planetary gear sets may be operatively connected to at least one of the input clutch members.

Abstract: A planetary gear type speed change device having a first planetary gear mechanism 10, 12, 14, 16 or 60, 64, 66, 68, 70 and a second planetary gear mechanism 20, 22, 24, 26 or 62, 64, 66, 70 incorporated between an input shaft 52 and an output shaft 54 by a selectively actuable drive system including four clutches 38, 40, 42, 44, two brakes 46, 48 and a one-way clutch 34, wherein the one-way clutch 34 has two functions of selectively braking the ring gear 12 or the carrier 70 with respect to the housing 50 via the brake 46 in providing a first speed stage and also of selectively connecting the carrier 26 or 70 with the sun gear 20 or 62 via the clutch 40 in providing a third speed stage.

Abstract: A transmission has a torque converter with an impeller, primary and secondary turbines and a stator. In a first planetary gear set the carrier is connected to the primary turbine, the sun gear is connected to the secondary turbine and the ring gear is connected to a one-way clutch. A second planetary gear set has a second carrier connected to the output shaft and a second ring gear connected to the first carrier. A brake is connected to the one-way clutch and to the second sun gear for low forward operation. The one-way clutch is used in the first phase of low forward and in reverse. A clutch locks up the second planetary gear set in drive operation. The one-way clutch is centrifically disabled before and during drive operation.

Abstract: A planetary gear type speed change device having two simple planetary gear mechanisms positioned axially adjacent with one another with each carrier thereof being connected with each ring gear of the other, three clutches and three brakes assembled together between an input rotational member and an output rotational member so as to provide six monotonously changing gear ratios between the input and the output rotational members according to combinations of engagement and disengagement of the three clutches and the three brakes.

Abstract: An automatic transmission has a main transmission mechanism having two planetary gear units made on a first axle, and a sub transmission mechanism having two planetary gear units made on a second axle; the main transmission mechanism having a single planetary gear unit and dual planetary gear unit, carriers of the gear units being connected to one another and sun gears of the gear units being connected one another, an input member connecting a ring gear of the single planetary gear unit through a first clutch, and connecting a sun gear through a second clutch, a brake restraining the sun gear and a ring gear of the dual planetary gear unit at a required moment; the main transmission mechanism having three forward speeds and one reverse speed. A fourth clutch may be added which connects an input shaft and the ring gear of the dual planetary gear unit, so that four forward speeds and one reverse speed are obtained. The sub transmission mechanism has three forward speeds.

Abstract: In an automatic transmission provided with an automatic transmission mechanism section with a planetary gear unit and a torque converter, a snap ring groove is defined by an annular flange section for a stator shaft and a pump cover, and the reaction from a return spring is borne in the annular flange section. A stator shaft, which bears the stator reaction of a torque converter, is engagingly secured in a center hole section of an oil pump assembly, an annular flange section projecting to the radially outer side is formed at one end of the stator shaft, the snap ring groove is defined from the annular flange section and an annular recessed section of the oil pump assembly to receive the snap ring, and a receiving member for the return spring of the hydraulic actuator is maintained by the snap ring installed in the snap ring groove.