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: 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 gearbox comprises parallel primary or input and secondary or output shafts in a casing. An output gear train of two constant-mesh gearwheels is fastened to the secondary shaft. An independent input gear train of four constant-mesh gearwheels and a first and a second clutch are mounted on the primary shaft. A third clutch is mounted on the secondary shaft. The first and third clutches respectively couple the input train to the primary shaft and to the secondary shaft. A three-element planetary gearset concentric with the primary shaft comprises a sun gear fastened to the input train, a planet carrier coupled to the primary shaft by the second clutch and a ring gear fastened to the output train. Thus the gearbox features three gear ratios by respective combinations of pairs of the three clutches. This arrangement constitutes a basic gearbox.

Abstract: The transmission system especially for automobile vehicles comprises an input gearbox (P) and a main gearbox (B) disposed between an input shaft (E) and an output shaft (S) and interconnected by an intermediate shaft (M). The transmission system comprises a series of numerous progressively distribution forward running ratios and a simple control system. Reverse running is obtained by means of the input gearbox (P), which enables gear ratios of the same order to be obtained in reverse running as in forward running and further provides a supplementary forward running ratio at the top of the series of ratios. A gearing down mechanism (TL) may be added to the main gearbox (B) to widen the range of transmission ratios in both directions.