Patent ID: 7491144
Filing Date: 2009-02-17
Classification: B60K,B60W,F16H,Y02T

Abstract:
1. An electromechanical transmission comprising: an input member; an output member; first and second motor/generators; first and second differential gear sets each having a first, a second and a third member and being represent able by a first and a second lever of a lever diagram, respectively, each of said levers having a first, a second and a third node corresponding with said first, second and third members; a reduction gear operatively connected with said output member and configured to provide a reduction in speed ratio; wherein said first node of said first lever is operatively connected with said input member and is continuously connected with said first node of said second lever for common rotation therewith; wherein said second node of said first lever is operatively connected with said output member without connection through either of said second lever and said reduction gear; wherein said second node of said second lever is continuously connected with said reduction gear for common rotation therewith; and wherein said third node of said first lever is continuously connected with said first motor/generator and said third node of said second lever is continuously connected with said second motor/generator; wherein the transmission is characterized by an absence of selectively engagable torque-transmitting mechanisms for establishing first and second mechanical power paths between said input member and said output member; the transmission thereby being characterized as a single mode, compound-split electrically variable transmission with said two mechanical power paths between said input member and said output member, said reduction ratio active in only one of said mechanical power paths.