Abstract: A multi-ratio transmission system is provided, including multiple planet gear sub-systems, at least two coupling assemblies, a setting element, a setting element controller, an annular gear, a cylindrical casing, a sprocket, and a central axle. The planet gear sub-systems are disposed coaxially in series along a first axis. Each of the planet gear sub-system includes a sun gear and at least one planet gear. Each coupling assembly transmits the rotation between every two adjacent planet gear sub-systems. The setting element optionally engages with the sun gear. The annular gear is installed onto a one-way clutch. The cylindrical casing encloses the planet gear sub-systems. The sprocket is installed onto the planet gear sub-systems through the one-way clutch. The central axle enables the hollowed tube of the setting element controller to rotate around the central axle.

Abstract: An automatic transmission includes an input shaft, first to fourth planetary gear mechanisms and first to seventh engagement devices. Ten forward gears of the automatic transmission are established by bringing at least three of the first to seventh engagement devices into an engagement state.

Abstract: An automatic transmission includes an input shaft, an output member, a first planetary gear system, a second planetary gear system, a third planetary gear system, a fourth planetary gear system, and an engagement mechanism. The input shaft is configured to be rotated with power of a driving source relative to the transmission case. The output member is to output rotation of the input shaft using multiple gear-shifting. The multiple gear-shifting is provided by setting at least three of first to third clutches and first to third brakes in a connection state.

Abstract: A gear train of an automatic transmission for vehicles has the advantages of simplifying structures of the automatic transmission and improving power delivery performance and fuel economy as a consequence of realizing at least nine forward speeds and one reverse speed by combining three simple planetary gear sets with four clutches and three brakes.

Abstract: An automatic speed reducing ratio-switching apparatus comprising an input side carrier, an output side carrier, and an intermediate carrier includes first and second planetary gear mechanisms juxtaposed in the axial direction of an input shaft, first and second inner clutch members which are rotatable in one direction while locking rotation in the other direction of the input shaft, and have mutually different locking directions, first and second outer clutch members which are rotatable in one direction while locking rotation in the other direction of the input side or output side ring gear, and have mutually different locking directions, and a viscous resistance member functioning under a static frictional force to integrally rotate the input side or output side sun gear, the input side or output side planet gears, and the input side or output side ring gears respectively in an identical direction.

Abstract: An automatic speed reducing ratio-switching apparatus comprising an input side carrier, an output side carrier, and an intermediate carrier includes first and second planetary gear mechanisms juxtaposed in the axial direction of an input shaft, first and second inner clutch members which are rotatable in one direction while locking rotation in the other direction of the input shaft, and have mutually different locking directions, first and second outer clutch members which are rotatable in one direction while locking rotation in the other direction of the input side or output side ring gear, and have mutually different locking directions, and a viscous resistance member functioning under a static frictional force to integrally rotate the input side or output side sun gear, the input side or output side planet gears, and the input side or output side ring gears respectively in an identical direction.

Abstract: An electrically variable transmission includes an input member to receive power from an engine about a primary axis; an output member connected to a transfer member for transmitting power to a secondary axis; first and second motor/generators; first and second torque transfer devices; and first and second planetary gear sets each having first, second and third members. The input member is continuously connected to the first member of the first gear set, and the output member is continuously connected to the first member of the second gear set. The first motor/generator is continuously connected to the second member of the first gear set. The second motor/generator is continuously connected with the third member of the first or second gear set. The transfer member is positioned between the first and second motor/generators.

Abstract: A multiple gear transmission having a drive shaft (1) and a driven shaft (2), three planetary gear sets (P1, P2, P3), seven rotatable shafts (1, 2, 3, 4, 5, 6, 7) and seven shifting elements (03, 04, 05, 06, 14, 37, 57) comprising four brakes (03, 04, 05, 06,) and three clutches (14, 37, 57). Selective engagement of the seven shifting elements (03, 04, 05, 06, 14, 37, 57) produces from the drive supplied by the drive shaft (1), via the three planetary gear sets (P1, P2, P3), the seven rotatable shafts (1, 2, 3, 4, 5, 6, 7) and the driven shaft (2), different reduction ratios for nine forward gears and one reverse gear.

Abstract: A multiple gear transmission having a drive shaft (1) and a driven shaft (2), three planetary gear sets (P1, P2, P3), seven rotatable shafts (1, 2, 3, 4, 5, 6, 7) and seven shifting elements (03, 04, 05, 06, 14, 37, 57) comprising four brakes (03, 04, 05, 06) and three clutches (14, 37, 57). Selective engagement of the seven shifting elements (03, 04, 05, 06, 14, 37, 57) produce, from the drive supplied by the drive shaft (1) via the three planetary gear sets (P1, P2, P3), the seven rotatable shafts (1, 2, 3, 4, 5, 6, 7) and the driven shaft (2), different reduction ratios for seven or eight forward gears and one reverse gear.

Abstract: A method of determining shift points in a step gear transmission system to maximize fuel economy is disclosed. In operation, the method uses fuel economy data from a first gear ratio to determine a first series of constant fuel consumption curves for the first gear ratio. The method then uses fuel economy data from a second gear ratio to determine a second series of constant fuel consumption curves for the second gear ratio. Next, the method determines points of intersection where a respective fuel consumption curve for the first gear ratio intersects its corresponding fuel consumption curve for the second gear ratio. A decision curve is generated from the points of intersection.

Abstract: A final drive for a multi-speed power transmission has freewheeler timed up and down forward power shifts utilizing two planetary gear sets connected between the transmission and differential. For low ratio a smaller diameter sun gear of a first gear set is driven through a freewheeler with the associated ring gear held for reaction so that the pinion carrier assembly drives the differential at a low ratio. For high ratio, a larger diameter sun gear of a second gear set is directly driven while a high-reverse clutch holds the associated ring gear for reaction. The pinion carrier assembly common to both gear sets drives the differential at a higher speed ratio as the freewheeler overruns on torque reversal. The ring gear of the second gear set of one embodiment has a path to ground through an additional freewheeler for coast control. The outer race of the low-ratio freewheeler has external teeth to park-lock the associated sun gear through a grounded parking pawl.

Abstract: Improvements to a Shiftless, Continuously-Aligning Transmission (SCAT) to provide the turbine member of a torque converter with variable torque-increasing gearing and give it additional work advantage over a work load and eliminate a vast amount of slippage in the converter, the improvements embodying reactive planetary gears mechanically engaging the turbine to a sun gear of a planetary gear set; mobile ring gears controlled by a drive shell extending rearward and engaged to a mechanical ring gear modulator which controls the direction and speed of the planetary ring gears to vary the output torque being delivered by the converter; a two-section input turbine shaft; a clutch mechanism to engage the two turbine shaft sections; a clutchless, continuously engaged overdrive planetary unit; hydraulic controls; and electrical braking controls.

Abstract: An automatic transmission having a turbine, a pump, a first stator and a second stator and a speed changer having a planetary gear train composed of first and second planetary gears sharing one planetary carrier in common and a clutch or brake for controlling the planetary gear train. The turbine of the torque converter is coupled to a turbine shaft which transmits power from the turbine to the speed changer. A first stator is provided at a turbine side between the turbine and the pump, the first stator being coupled to a first stator shaft for transmitting power from the first stator to the speed changer a one-way clutch. A second stator is provided at a pump side between the turbine and the pump. The second stator is connected to a housing though a second stator shaft having a one-way clutch for transmitting power in a direction reverse to the rotation direction of the pump. A clutch or brake for controlling rotation speed of the first stator shaft is provided in the course of the first stator shaft.