The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least seven forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having six torque-transmitting mechanisms and a fixed interconnection....http://www.google.fr/patents/US6767306?utm_source=gb-gplus-shareBrevet US6767306 - Transmission mechanisms with three gear sets and a stationary gear member
Transmission mechanisms with three gear sets and a stationary gear member
