Family of multi-speed transmission mechanisms having three planetary gear sets and six torque-transmitting devices

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 input shaft being continuously interconnected with at least one member of said planetary gear sets, said output shaft being continuously interconnected with another member of said planetary gear sets;
• a first interconnecting member continuously interconnecting said first member of said first planetary gear set and said first member of said second planetary gear set;
• a second interconnecting member continuously interconnecting said second member of said first planetary gear set and said first member of said third planetary gear set;
• a third interconnecting member continuously interconnecting said second member of said second planetary gear set with said second member of said third planetary gear set;
• a first torque-transmitting mechanism selectively interconnecting a stationary transmission housing with a member of said first planetary gear set,
• a second torque-transmitting mechanism selectively interconnecting said stationary transmission housing with a member of said second planetary gear set;
• a third torque-transmitting mechanism selectively interconnecting a member of said first planetary gear set with 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 third planetary gear set with member of said first or second planetary gear set;
• and
• a sixth torque-transmitting mechanism selectively interconnecting a member of the first, second or third planetary gear sets with another member of said first, second or third planetary gear sets, said members interconnected with said sixth torque-transmitting mechanism being different from the members interconnected with said third, fourth and fifth torqur-transmitting mechanisms;
• said members interconnected with said first and second torque-transmitting mechanisms being different from the members continuously interconnected with said input shaft and said output shaft;
• said torque-transmitting mechanisms being engaged in combinations of two to establish at least seven forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.