| 摘要 |
A 7 speed power train of an automatic transmission is provided to prevent previously an accident by minimizing vibration. A first single pinion planetary gear set(SPG1) includes a first sun gear(S1) connected directly to a case(1), a first planetary carrier(PC1) coupled to the first sun gear and connected directly to an output shaft(2), and a first ring gear(R1) coupled to the first planetary carrier. A second single pinion planetary gear set(SPG2) includes a second sun gear(S2) connected directly to an input shaft(3), a second planetary carrier(PC2) coupled to the second sun gear, connected directly to the first planetary carrier, and a second ring gear(R2) coupled to the second planetary carrier. A complex planetary gear set(DPG) includes a third sun gear(S3) connected directly to the input shaft; a third planetary carrier(PC3) coupled to the third sun gear; connected through a second brake(B2) to the case; a fourth planetary carrier(PC4) coupled to the third sun gear; a third ring gear(R3) coupled to the fourth planetary carrier, connected through the second clutch to the second planetary carrier, and connected through the first clutch to the second ring gear; and a fourth ring gear(R4) coupled to the third planetary carrier, connected through the third clutch to the first ring gear, connected through the first brake to the case.
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