Patent ID: 7393298
Filing Date: 2008-07-01
Classification: B60K,F16H,Y02T

Abstract:
1. An electrically variable transmission comprising: an input member to receive power from an engine; an output member; first and second motor/generators; first, second and third differential gear sets each having first, second and third members; said input member being continuously connected with at least one member of said gear sets, and said output member being continuously connected with at least one member of said gear sets; a first interconnecting member continuously connecting said first member of said first gear set with said first member of said second gear set and with said first member of said third gear set; a second interconnecting member continuously connecting said second member of said first gear set with said second member of second gear set; a third interconnecting member continuously connecting said third member of said first gear set with said second member of said third gear set; said first motor/generator being continuously connected with a member of said first, second, or third gear set; said second motor/generator being continuously connected with a member of said first, second or third gear set; a first torque transfer device selectively connecting a member of said first, second or third gear set with another member of the first, second, or third gear set; a second torque transfer device selectively connecting a member of said first, second or third gear set with a stationary member; a third torque transfer device connected in parallel with one of said first and second motor/generators for selectively preventing rotation thereof; a fourth torque transfer device connected in parallel with the other of said first and second motor/generators for selectively preventing rotation thereof; and wherein said first, second, third, and fourth torque transfer devices are engageable to provide an electrically variable transmission with a continuously variable range of speed ratios and four fixed forward speed ratios.