Patent ID: 8287416
Filing Date: 2012-10-16
Classification: F16H

Abstract:
1. A multi-speed transmission comprising: an input member; an output member; a stationary member; an intermediate member; a planetary gear set having a first member, a second member and a third member; wherein the first member is grounded to the stationary member, and the second member is connected for common rotation with the output member; wherein the input member, the output member, the intermediate member, and the planetary gear set are arranged coaxially with one another to define a first axis of rotation; a first and a second layshaft defining a second axis of rotation and a third axis of rotation, respectively; seven selectively engagable torque-transmitting mechanisms; at least three sets of intermeshing gears, some of which are arranged to transfer torque from the input member to the layshafts, and another of which is arranged to transfer torque from the layshafts to the intermediate member via engagement of different respective ones of the torque-transmitting mechanisms; each set of intermeshing gears being axially spaced from the other sets of intermeshing gears; wherein the seven torque-transmitting mechanisms include a first, a second, a third, and a fourth torque-transmitting mechanism that are each selectively engagable to connect a respective gear of the sets of intermeshing gears for common rotation with a respective one of the layshafts, a fifth torque-transmitting mechanism selectively engagable to connect the intermediate member for common rotation with the second member of the planetary gear set, and a sixth torque-transmitting mechanism selectively engagable to connect the intermediate member for common rotation with the third member of the planetary gear set; and wherein the seven torque-transmitting mechanisms are engagable in different combinations to establish up to eight forward speed ratios and a reverse speed ratio between the input member and the output member.