| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress a friction loss of an automatic transmission that changes the speed of rotation of an input shaft in a plurality of stages through a plurality of planetary gear mechanisms arranged in a transmission case to output the changed speed of rotation from an output member. <P>SOLUTION: The automatic transmission includes four planetary gear mechanisms PGS1-PGS4, three clutches C1-C3, and three brakes B1-B3. A first element Sa is connected to the input shaft 2, a tenth element Rd is connected to the output member 3, a second element Ca is connected to a fifth element Cb, a third element Ra is connected to an eighth element Cc, and a sixth element Rb and a seventh element Rc are connected to a twelfth element Sd. The first clutch C1 is configured to freely connect the first element Sa to an eleventh element Cd, the second clutch C2 is configured to freely connect a first connecting body Ca-Cb to the eleventh element Cd, and the third clutch C3 is configured to freely connect a second connecting body Ra-Cc to a fourth element Sb. The first brake B1, the second brake B2 and the third brake B3 are configured to freely fix the second connecting body Ra-Cc, a ninth element Sc and the eleventh element Cd respectively to the transmission case 1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
