Abstract: A torque converter system is provided with two differential gears, the cage of the first differential gear receiving the power from the engine motion input shaft and the output shaft of the second differential gear cage driving the system output shaft. The two differential gears have their four planetaries coupled two by two, wherein:the engine motion input shaft and the system power output shaft are coaxial;the motion is transmitted through each differential gear by planetary shafts which are coaxial to each other and coaxial to the shaft respectively connected to the input cage and the output cage,a mechanism is provided for the staging of fixed ratios between the rotation speeds at the input and the output; a rotation of the converter system output shaft in one direction and in the other; a disconnection of the output shaft in order to obtain a dead point, and the blocking of the output shaft rotation.

Abstract: A torque converter acts by continuous differential retroaction with a staging of fixed gear ratios. Two differential gears are included in the transmission, one of which receives power through its cage on one side, and outputs power through its two side gears on the otherside. The other differential receives both of the outputs from the first differential on one side, and outputs power through the carrier to the other side. A forward reverse fixed gearing is driven by the output from the second differential and drives an output shaft. The output shaft is coaxial to the input shaft.