Patent ID: 7766785

Claim:
A multiple-speed automatic transmission comprising: an input; an output; a Ravigneaux gearset including a first sun gear secured to a first rotating member; a second sun gear secured to a second rotating member, a fourth rotating member and a fifth rotating member; a first ring gear secured to the output; a first carrier secured to a third and a sixth rotating members; first planet pinions rotatably supported on the first carrier and meshing with the first sun gear; second planet pinions rotatably supported on the first carrier and meshing with the second sun gear, first planet pinions and a first ring gear; a first clutch being operable to connect the first gear unit output and the first rotating member; a second clutch being operable to connect the first gear unit output and the second rotating member; a third clutch being operable to connect the third rotating member and the input; fourth clutch being operable to connect the fourth rotating member and the input; a first brake being operable to hold the fifth rotating member against rotation; a second brake being operable to hold the sixth rotating member against rotation; a first gear unit producing a gear ratio greater than unity and including a third sun gear secured to the input, the third clutch and the fourth clutch; a second ring gear secured to the first and second clutches; a second carrier grounded against rotation and secured to the first brake; third planet pinions supported on the second carrier and meshing with the third sun gear; and fourth planet pinions supported on the second carrier and meshing with the third planet pinions, and the second ring gear.