Abstract: One embodiment may include a system for distributing torque between front and rear axles of an all wheel drive vehicle and/or between left and right wheels of a two or four wheel drive vehicle comprises at least one limited slip coupling having a disc package and a piston acting thereon, the piston being actuated by a hydraulic pump assembly. This assembly has an electric motor, a hydraulic pump driven thereby, and a centrifugal regulator also driven thereby, the centrifugal regulator controlling a pressure overflow valve, connected to the oil outlet of the hydraulic pump. The assembly specifically comprises an axial piston pump having a piston drum rotatable in a pump housing and containing a number of reciprocable axial pistons, at least one centrifugal lever pivotally attached to the piston drum, and a valve member connected to the centrifugal lever and being arranged for cooperation with the mouth of an oil outlet bore in the piston drum to form the pressure overflow valve.

Abstract: One embodiment may include a system for distributing torque between front and rear axles of an all wheel drive vehicle and/or between left and right wheels of a two or four wheel drive vehicle comprises at least one limited slip coupling having a disc package and a piston acting thereon, the piston being actuated by a hydraulic pump assembly. This assembly has an electric motor, a hydraulic pump driven thereby, and a centrifugal regulator also driven thereby, the centrifugal regulator controlling a pressure overflow valve, connected to the oil outlet of the hydraulic pump. The assembly specifically comprises an axial piston pump having a piston drum rotatable in a pump housing and containing a number of reciprocable axial pistons, at least one centrifugal lever pivotally attached to the piston drum, and a valve member connected to the centrifugal lever and being arranged for cooperation with the mouth of an oil outlet bore in the piston drum to form the pressure overflow valve.