Power on demand differential

摘要

A differential assembly (14) having first, second and third structures, a differential gear set and a biasing mechanism. The first structure is configured to rotate along a differential axis in response to receipt of a rotational input. The second structure is supported for rotation on the differential axis, The third structure is supported for rotation on the differential axis and disposed between the first and second structures. The third structure can be operated in an engaged condition for transmitting torque from the first structure to the second structure and a disengaged condition for inhibiting the transmission of torque from the first structure to the second structure. The differential gear set (96) is coupled to and rotatably supported within the second structure. The biasing mechanism (94) biases the third structure in the disengaged condition. The third structure is placed in the engaged condition if a torsional magnitude of the rotational input exceeds by a predetermined amount a torsional magnitude of a rotational force exerted through the differential gear set. A vehicle drive train is also provided. <IMAGE>