Patent ID: 8596436

Claim:
A power transfer unit for a motive device, comprising: an outer housing; an inner housing comprising first spline recesses; a rotatable hollow shaft bisecting the inner housing, the hollow shaft comprising second spline recesses and first dog-clutch coupling features; a torque transferring clutch comprising at least one wet-clutch surface and spline connections to the second spline recess of the rotatable hollow shaft; a dog collar adjacent the torque transferring clutch, the dog collar comprising a first surface and a second surface, the second surface comprising second dog-clutch coupling features and a wet-clutch coupling surface; a piston housing located between the outer housing and the dog collar; and a piston assembly comprising a piston in the piston housing, wherein the piston assembly is configured to provide actuation forces to the torque transferring clutch by moving the dog collar, wherein, when the piston assembly provides the actuation forces, the second dog-clutch coupling features of the dog collar engage the first dog-clutch coupling features of the hollow shaft, and the wet-clutch coupling surface of the dog-collar engages the at least one wet-clutch surface of the torque transferring clutch, and wherein, when the torque transferring clutch receives the actuation forces, the inner housing rotates.