Patent ID: 7178644

Claim:
A retarder ( 16 ), as a braking device or auxiliary braking device for vehicles, having a stator ( 3 ), comprising at least two axially spaced-apart stator halves ( 3 a , 3 b ), which each have magnetic field coils and are coupled to the vehicle or to an undercarriage ( 19 ) of the vehicle, and a rotor disk ( 1 ) connected to an axle ( 5 ) or shaft of the vehicle, comprising two adjacent rotor halves ( 1 a , 1 b ), the rotor halves ( 1 a , 1 b ) having an axial clearance from one another in a radially outer annular section ( 7 a , 7 b ) and the rotor halves ( 1 a , 1 b ) being disposed axially between the at least two stator halves ( 3 a , 3 b ), characterized in that the rotor halves ( 1 a , 1 b ) are embodied for a relative motion in the axial direction to one another, and that the rotor halves ( 1 a , 1 b ) are embodied as separate components from one another, which are joined to one another in a radially inner annular region, oriented toward the axle ( 5 ) or shaft, and that the rotor halves ( 1 a , 1 b ) are secured to the axle ( 5 ) or shaft by tightening elements, comprising outer and inner annular elements ( 9 , 10 ) which are wedged to one another in the axial direction via corresponding oblique faces or conical faces by screws ( 8 ) to press the inner annular elements ( 10 ) onto the axle ( 5 ).