Patent ID: 8888637
Filing Date: 2014-11-18
Classification: B60L,F16H,Y02T

Abstract:
1. A vehicle drive system including a transmission, the system comprising: a compound planetary gear set including first, second, third and fourth elements, the second element comprising a ring gear continuously connecting with an output shaft of the transmission; a transmission housing; an electric motor having an output shaft connecting with the first and fourth elements for driving the first and fourth elements in response to an electrical signal to obtain a desired transmission ratio; a non-friction controllable clutch assembly being non-hydraulically controlled to change between a coupling state for coupling the fourth element to the motor output shaft and an uncoupling state for uncoupling the fourth element from the motor output shaft; and a non-friction controllable brake assembly having a coupling state for coupling the third element to the housing and an uncoupling state for uncoupling the third element from the housing, the brake assembly being non-hydraulically controlled to change state to maintain the desired transmission ratio.