Patent ID: 8187139
Filing Date: 2012-05-29
Classification: F16H,Y10T

Abstract:
1. A multiple speed power transmission, comprising: a gearbox input shaft; an output shaft; and a collection of gears, friction brakes, clutches, and passive couplers capable of transmitting power from the gearbox input shaft to the output shaft with multiple forward speed ratios and at least one reverse speed ratio and wherein the first forward speed ratio is selected by engaging exactly one brake using an electro-mechanical actuator; the collection of gears, friction brakes, clutches, and passive couplers comprising first, second, and third epicylic gearing assemblies each comprising first, second, and third rotating elements, wherein: a one way brake which precludes the third rotating element of the third epicyclic gearing assembly from rotating in a negative direction while allowing said element to rotate in a positive direction, and an electro-mechanically actuated first friction brake for selectively holding against rotation the first rotating element of the second epicyclic gearing assembly and the first rotating element of the third epicyclic gearing assembly.