MULTI-SPEED TRANSMISSION

摘要

An automatic transmission (20) includes: a single pinion first planetary gear (21); a single pinion second planetary gear (22); a compound planetary gear mechanism (25) that is formed by combining a single pinion third planetary gear (23) and a single pinion fourth planetary gear (24); clutches (C1-C4); and brakes (B1, B2). Forward gears from a first gear to a ninth gear, a tenth gear, or an eleventh gear and a reverse gear are formed by engaging any three of the clutches (C1-C4) and the brakes (B1, B2) while releasing the remaining three.