Patent ID: 6269925
Filing Date: 2001-08-07
Classification: F16D

Abstract:
A viscous coupling comprising:a housing;a working chamber disposed is said housing and being filled with a viscous fluid, said viscous fluid having magnetizable particles disposed therein;at least one drivable rotor disposed in said working chamber and having shearing areas for transmitting torque;a supply chamber separated from said working chamber by a dividing wall, said supply chamber containing the viscous fluid;a pumping opening connecting said supply chamber with said working chamber for delivering said viscous fluid from said working chamber to said supply chamber;a first feed line having a length and connecting said supply chamber with said working chamber for delivering viscous fluid from said supply chamber to said working chamber; andvolumetric-flow setting means positioned along at least a part of the length of said first feed line and comprising an electromagnet generating a magnetic field in a magnetic field region through which said part of the length of the first feed line extends, wherein a flow velocity of the viscous fluid flowing in said first feed line through said magnetic field is variable as a function of an intensity of said magnetic field in said magnetic field region, wherein said first feed line comprises a first feed line section leading to said supply chamber and a second feed line section connecting said supply chamber to said working chamber, said second feed line section being axially offset from said first feed line section in a direction of said volumetric-flow setting means, and wherein said first and second line sections of said first feed line comprise radial bores.