Multi-step automatic planetary reduction gearbox for a motor vehicle has drive and driven shafts, single-link planet sets, rotary shafts and gearshift devices.

摘要

Shafts (1-6) and gearshift devices (03-05,16,45,56) couple up single-link planet sets (P1-P3) of gearing. The shafts and gearshift devices along with brakes (03-05) and clutches (16,45,56) use selective gearshift to engage forward and reverse gears. Selective gear engagement in twos causes different transmission relationships between a drive shaft (1,An) and a driven shaft (2,Ab). The drive shaft links directly to a link in a first planet set (FPS) (P1). The driven shaft connects to a link in a second planet set (SPS) (P2). A third shaft (3) makes a continuous link (CL) with sun wheels in the SPS and a third planet set (TPS). A fourth shaft (4) links to a ring gear in the FPS and to a ring gear in the TPS. A fifth shaft (5) connects to a link in the FPS. A sixth shaft (6) makes a CL between a link in the TPS and a ring gear in the SPS.