Abstract: A differential device for coupling an input shaft, a first output shaft, and a second output shaft is provided. The differential device preferably includes a differential case with a first side gear, a second side gear, a pinion gear, and a hydraulic conduit. The differential device preferably includes a first rotary pump, which preferably functions to pump hydraulic fluid through the hydraulic conduit upon the relative rotational movement of the differential case and the first output shaft and to resist relative rotational movement of the differential case and the first output shaft upon a restriction of the transmittal of hydraulic fluid through the hydraulic conduit. The differential device also preferably includes a valve system, which functions to selectively restrict the transmittal of hydraulic fluid through the hydraulic conduit.

Abstract: A differential device for transferring torque and rotation from an input shaft to a first output shaft and a second output shaft of a vehicle is provided. The differential device includes a carrier coupled to an input shaft, a first pump/motor coupled to the carrier and to the first output shaft, and a second pump/motor coupled to the carrier and to the second output shaft. The first pump/motor preferably functions to pump a hydraulic fluid upon a rotation of the first output shaft at a different speed than the carrier, and to rotate the first output shaft at a different speed than the carrier upon a sufficient pressurization of the hydraulic fluid. Similarly, the second pump/motor preferably functions to pump a hydraulic fluid upon a rotation of the second output shaft at a different speed than the carrier, and to rotate the second output shaft at a different speed than the carrier upon a sufficient pressurization of the hydraulic fluid.