Patent ID: 6745879
Filing Date: 2004-06-08
Classification: F16D

Abstract:
A transfer mechanism controlling a magnitude of clutch engagement force exerted on a multi-plate clutch assembly that is operably disposed between an input member and an output member, comprising:an actuator fixed for rotation with the input member and having a piston chamber formed therein; a piston slidably disposed within said piston chamber and selectively engaging a clutch pack of the multi-plate clutch assembly; a pump in fluid communication with said piston chamber via a supply passage and a return passage, said pump having a first pumping member fixed for rotation with said actuator and a second pumping member fixed for rotation with the output member for pumping a magnetorheological fluid through a flow path between said supply passage, said piston chamber and said return passage; and an electromagnet disposed adjacent to a portion of said return passage, wherein said electromagnet is selectively energized for manipulating a viscosity of said magnetorheological fluid to induce a back pressure within said piston chamber, thereby inducing axial movement of said piston for engaging the multi-plate clutch assembly.