Multi-speed planetary transmission with three brakes and four clutches

A multi-speed transmission comprising:

• an input member;
• an output member;
• a stationary member;
• a first and a second compound planetary gear set;
• wherein the first compound planetary gear set has a first, a second, a third, a fourth, and a fifth member;
• wherein the second compound planetary gear set has a first, a second, a third, and a fourth member;
• wherein the first, the second, the third, the fourth, and the fifth members of the first compound planetary gear set are a first carrier member, a first sun gear member, a second sun gear member, a first ring gear member and a second ring gear member, respectively;
• wherein the first carrier member rotatably supports a stepped pinion gear having a relatively small diameter portion that meshes with the first ring gear member and the second sun gear member, and a relatively large diameter portion that meshes with the first sun gear member and the second ring gear member;
• wherein the first, the second, the third, and the fourth members of the second compound planetary gear set are a second carrier member, a third ring gear member, a third sun gear member, and a fourth ring gear member, respectively;
• wherein the second carrier member rotatably supports a third and a fourth set of pinion gears;
• wherein the third set of pinion gears meshes with the third ring gear member and the third sun gear member;
• wherein the fourth set of pinion gears meshes the third set of pinion gears and the fourth ring gear member;
• wherein the second carrier member of the second compound planetary gear set is continuously connected for common rotation with the output member;
• an interconnecting member continuously connecting the first carrier member of the first planetary gear set for common rotation with the third ring gear member of the second planetary gear set;
• seven selectively engagable torque-transmitting mechanisms;
• wherein the input member is selectively connectable to the first sun gear member of the first compound planetary gear set via engagement of a first of the seven torque-transmitting mechanisms;
• wherein the input member is selectively connectable to the second sun gear member of the first compound planetary gear set via engagement of a second of the seven torque-transmitting mechanisms;
• wherein the first ring gear member of the first compound planetary gear set is selectively grounded to the stationary member via engagement of a third of the seven torque-transmitting mechanisms;
• wherein the second ring gear member of the first compound planetary gear set is selectively grounded to the stationary member via engagement of a fourth of the seven torque-transmitting mechanisms;
• wherein the input member is selectively connected for common rotation with the third sun gear member of the second compound planetary gear set via engagement of a fifth of the seven torque-transmitting mechanisms;
• wherein the third ring gear member of the second compound planetary gear set is selectively connected for common rotation with the third sun gear member of the second compound planetary gear set via engagement of a sixth of the seven torque-transmitting mechanisms;
• and
• wherein the fourth ring gear member of the second compound planetary gear set is grounded to the stationary member via engagement of a seventh of the seven torque-transmitting mechanisms, the seven torque-transmitting mechanisms being engagable in different combinations to establish up to fourteen forward speed ratios and a reverse speed ratio between the input member and the output member.