Multi-speed dual-clutch planetary transmission mechanisms having four gear sets and a stationary member

A multi-speed transmission comprising:

• an input shaft;
• an output shaft;
• first, second, third and fourth planetary gear sets each having first, second and third members;
• a first interconnecting member continuously interconnecting said first member of said first planetary gear set with said first member of said second planetary gear set;
• a second interconnecting member continuously interconnecting said second member of said first planetary gear set with said second member of said second planetary gear set;
• a third interconnecting member continuously interconnecting a member of said first or second planetary gear set with said first member of said third planetary gear set and said output shaft;
• said first member of said fourth planetary gear set being continuously connected with a stationary member;
• a first input clutch continuously connected with said input shaft;
• a second input clutch selectively interconnecting said input shaft with said second member of said third planetary gear set;
• and
• nine torque-transmitting mechanisms for selectively interconnecting said members of said first, second, third or fourth planetary gear sets with said first or second input clutch, said output shaft, said first, second or third interconnecting member, said stationary member or with other members of said planetary gear sets, said input clutches and nine torque-transmitting mechanisms being engaged in combinations of at least three to establish at least six forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.

A multi-speed transmission comprising:

• an input shaft;
• an output shaft;
• first, second, third and fourth planetary gear sets each having first, second and third members;
• a first interconnecting member continuously interconnecting said first member of said first planetary gear set with said first member of said second planetary gear set;
• a second interconnecting member continuously interconnecting said second member of said first planetary gear set with said second member of said second planetary gear set;
• a third interconnecting member continuously interconnecting a member of said first or second planetary gear set with said first member of said third planetary gear set and said output shaft;
• said first member of said fourth planetary gear set being continuously connected with a stationary member;
• first and second torque-transmitting mechanisms selectively interconnecting members of said first and second planetary gear set with said input shaft and, therefore, functioning as a first input clutch;
• a second input clutch selectively interconnecting said input shaft with said second member of said third planetary gear set;
• third, fourth, fifth and sixth torque-transmitting mechanisms selectively interconnecting members of said third planetary gear set with said second and third members of said fourth planetary gear set;
• seventh and eighth torque-transmitting mechanisms selectively interconnecting members of said first or second planetary gear sets with said stationary member;
• and
• a ninth torque-transmitting mechanism selectively interconnecting a member of said first or second planetary gear set with said input shaft;
• said input clutches and torque-transmitting mechanisms being engaged in combinations of at least three to provide at least six forward speed ratios and a reverse speed ratio.

A multi-speed transmission comprising:

• an input shaft;
• an output shaft;
• first, second, third and fourth planetary gear sets each having first, second and third members;
• a first interconnecting member continuously interconnecting said first member of said first planetary gear set with said first member of said second planetary gear set;
• a second interconnecting member continuously interconnecting said second member of said first planetary gear set with said second member of said second planetary gear set;
• a third interconnecting member continuously interconnecting a member of said first or second planetary gear set with said first member of said third planetary gear set and said output shaft;
• said first member of said fourth planetary gear set being continuously connected with a stationary member;
• a first input clutch continuously connected with said input shaft;
• a second input clutch selectively interconnecting said input shaft with said second member of said third planetary gear set;
• and
• eight torque-transmitting mechanisms for selectively interconnecting said members of said first, second, third or fourth planetary gear sets with said first or second input clutch, said output shaft, said first, second or third interconnecting member, said stationary member or with other members of said planetary gear sets, said input clutches and eight torque-transmitting mechanisms being engaged in combinations of at least three to establish at least five forward speed ratios and a reverse speed ratio between said input shaft and said output shaft.