Patent ID: 6237735
Filing Date: 2001-05-29
Classification: B60K,F16D,F16H,Y10T

Abstract:
A differential device of the type including an input adapted to receive input torque from a source of torque, an output adapted to provide driving torque to an output device, and a clutch pack including at least a first friction disc fixed to rotate with said input, and at least a second friction disc fixed to rotate with said output; means operable to move said friction discs between a disengaged position and an engaged position, and comprising a cam ramp actuator including first and second ramp plates, and a plurality of cam members, each operably disposed between said first and second ramp plates; said second ramp plate being disposed axially adjacent said friction discs and being operable to move said friction discs toward said engaged position; said means operable to move said friction discs further comprising a viscous coupling including an input coupling member fixed to rotate with said input, and an output coupling assembly; characterized by:(a) one-way clutch means disposed in series between said output coupling assembly and said first ramp plate; and(b) said one-way clutch means being configured such that positive torque is transmitted from said input through said viscous coupling, through said one-way clutch means to said first ramp plate during operation in a forward direction, whereas negative torques are not transmitted from through said one-way clutch means, during operation in said forward direction.