| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission advantageous in terms of gear efficiency, gear noise, durability reliability, and cost while achieving forward eight speeds by three planetary gears and six friction elements, and improving the efficiency of the transmission of drive energy by minimizing a friction loss. SOLUTION: The automatic transmission is equipped with: a second planetary gear PG2 by double pinions; and a first planetary gear PG1 and a third planetary gear PG3 by single pinions, an input shaft IN is always connected to a sun gear S1, an output shaft OUT is always connected to a ring gear R3, a sun gear S2 is always fixed to constitute a fixed member F1, and a carrier PC2 is always connected to a sun gear S3 to constitute a rotation member M1. At least a forward eight-speed and back one-speed transmission are obtained by simultaneously fastening three frictional elements out of six friction elements constituted of a first clutch C1, a second clutch C2, a third clutch C3, a fourth clutch C4, a fifth clutch C5, and a first brake B1. COPYRIGHT: (C)2011,JPO&INPIT
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