Planetary type multi-stage transmission i.e. automatic transmission, for passenger car, has four negative planetary gear sets and six rotatable shafts, where seventh shaft is connected to internal gear of first planetary gear set

摘要

The transmission has a drive shaft (1), an output shaft (2), four negative planetary gear sets (P1-P4) arranged in a housing (G), and six rotatable shafts (3-8). The fourth shaft is connected to a sun gear of the third planetary gear set. The output shaft is connected to a bar of the third planetary gear set. The fifth shaft is connected to an internal gear of the fourth planetary gear set, detachably connected to the seventh shaft and connected to a bar of the second planetary gear set. The seventh shaft is connected to an internal gear of the first planetary gear set.