| 摘要 |
In an automatic transmission incorporating a planetary gear transmission at a rear stage of a four-element torque converter comprising two stators, a turbine and a pump; a planetary gear train of an automatic transmission, wherein a reversal torque of a first stator reversing in a low speed ratio zone is converted into a normal torque by the planetary gear train so that this output from the first stator can be added to an output shaft, when a first speed of the planetary gear transmission is selected; a friction element is provided for limiting a rotation of the first stator in the speed ratio zone where the first stator rotates in the reverse direction, a one-way clutch for transmitting a torque only in a specified direction is installed, and the first stator is permitted to run idle by this one-way clutch so that a fluid loss in a stator portion can be minimized, when a second speed of the planetary gear transmission is selected.
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