Multi-stage planetary-type reduction gearbox i.e. automatic gearbox, for city bus, has driven shaft connected with ring gears and bar of two planetary gear trains, respectively, where sun wheel of one of gear trains is connected with shaft

摘要

The gearbox has a first planetary gear train (P1) whose sun wheel is connected with a first shaft (5) and couplable to a housing (G) over a brake (05). Ring gears of a second planetary gear train (P2) are connected with a second shaft (7). A third shaft (3) is connected with ring gears of a third planetary gear train (P3). A bar of a fourth planetary gear train (P4) is couplable to the housing over another brake (03) that is designed as a positive shift element. A driven shaft (2) is connected with ring gears and a bar of the first and second planetary gear trains, respectively. The planetary gear trains are designed as minus planetary gear trains.