Planetary transmissions with three interconnected gear sets and a stationary member

A multi-speed transmission comprising:

• an input shaft;
• an output shaft;
• first, second and third planetary gear sets each having first, second and third members;
• said output shaft being continuously interconnected with a member of said planetary gear sets;
• an interconnecting member continuously interconnecting said first member of said first planetary gear set with said first member of said second planetary gear set and said first member of said third planetary gear set;
• said second member of said first planetary gear set being continuously interconnected with a stationary member;
• a first torque-transmitting mechanism selectively interconnecting said input shaft with a member of said second planetary gear set;
• a second torque-transmitting mechanism selectively interconnecting said input shaft with a member of said third planetary gear set;
• a third torque-transmitting mechanism selectively interconnecting a member of said first planetary gear set with said input shaft, or a member of said third planetary gear set;
• a fourth torque-transmitting mechanism selectively interconnecting a member of said second planetary gear set with a member of said third planetary gear set;
• a fifth torque-transmitting mechanism selectively interconnecting a member of said second planetary gear set with said stationary member, said member interconnected by said fifth torque-transmitting mechanism being different from the member interconnected with the output shaft;
• a sixth torque-transmitting mechanism selectively interconnecting a member of said third planetary gear set with a member of said first or second planetary gear set, or with said stationary member, the pair of members interconnected by said sixth torque-transmitting mechanism being different from the member interconnected with said input shaft by said third torque-transmitting mechanism and from the pairs of members interconnected by said third and fourth torque-transmitting mechanisms, respectively;
• and
• said torque-transmitting mechanisms being engaged in combinations of three to establish at least seven forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.