Patent ID: 8052567
Filing Date: 2011-11-08
Classification: F16H

Abstract:
1. A multi-speed transmission comprising: an input member; an output member; first, second, third and fourth planetary gear sets each having first, second and third members; said input member being continuously connected to a member of said first planetary gear set; said output member is continuously connected to a member of said second planetary gear set, said third planetary gear set or said fourth planetary gear set; a first interconnecting member continuously connecting a member of said first planetary gear set with a member of said second planetary gear set; a second interconnecting member continuously connecting a member of said second planetary gear set with a member of said third planetary gear set; a third interconnecting member continuously connecting a member of said third planetary gear set with a member of said fourth planetary gear set; a fourth interconnecting member continuously connecting a member of said first planetary gear set with a member of said fourth planetary gear set; and six torque-transmitting devices being engaged in combinations of three to establish at least nine forward speed ratios and at least one reverse speed ratio between said input member and said output member.