Multi-speed transmission with compound and simple planetary gear sets and with layshafts

A multi-speed transmission comprising:

• an input member;
• an output member;
• a stationary member;
• a first compound planetary gear set and a second simple planetary gear set;
• wherein the input member, the output member and the planetary gear sets are arranged coaxially to define a first axis of rotation;
• wherein the first compound planetary gear set has two sun gear members, two ring gears members, and a carrier member that rotatably supports a stepped pinion having a first portion with a first diameter and a second portion with a second diameter larger than the first diameter;
• wherein the first portion meshes with one of the two sun gear members and one of the two ring gear members and wherein the second portion meshes with the other of the two sun gear members and the other of the two ring gear members;
• a first and a second layshaft arranged coaxially with one another to define a second axis of rotation;
• an interconnecting member continuously connecting the carrier member of the first compound planetary gear set for common rotation with a member of the second planetary gear set;
• a first set of intermeshing gears arranged to transfer torque from the input member to the first layshaft;
• a second set of intermeshing gears arranged to transfer torque from the second layshaft to the second planetary gear set;
• and
• seven torque-transmitting mechanisms each selectively engagable to connect a respective one of the members of the first compound planetary gear set with the stationary member, for common rotation with the input member or with a respective member of the second compound planetary gear set, or to interconnect the second layshaft with the stationary member or for common rotation with the first layshaft;
• the seven torque-transmitting mechanisms being engagable in different combinations of three to establish up to thirteen forward speed ratios and a reverse speed ratio between the input member and the output member.