| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a friction loss of an automatic transmission that speed-changes the rotation of an input shaft to a plurality of stages via a plurality of planetary gear mechanisms arranged in a transmission case, and outputs the rotation from an output member. <P>SOLUTION: The automatic transmission includes four planetary gear mechanisms PGS1 to PGS4, three clutches C1 to C3 and three brakes B1 to B3. Elements of the second and third planetary gear mechanisms PGS2, 3 constitute four rotating elements Y1 to Y4. The first element Sa is connected to the input shaft 2, the fourth element Rd is connected to the output member 3, the third element Ra is connected to the sixth element Sd, and the third rotating element Y3 is connected to the fifth element Cd. The first clutch C1 freely connects the first element Sa to the second rotating element Y2, the second clutch C2 freely connects the first element Sa to the first rotating element Y1, and the third clutch C3 freely connects the second element Ca to the fourth rotating element Y4. The first brake B1 freely fixes a first connected body Ra-Sd to the transmission case 1, the second brake B2 freely fixes the second rotating element Y2 to the transmission case, and the third clutch C3 freely fixes the second element Ca to the transmission case. <P>COPYRIGHT: (C)2012,JPO&INPIT |
