Patent ID: 6125975
Filing Date: 2000-10-03
Classification: B60T,F16D,H02K

Abstract:
An electromagnetic brake for braking a shaft which is rotatable about an axis of rotation, said brake comprising:(A) a friction disk which is attachable to the shaft so as to rotate about the axis of rotation of the shaft and to move axially relative to the axis of rotation of the shaft, said friction disk having first and second axially opposed friction surfaces;(B) a stationary reaction plate which is axially aligned with said friction disk;(C) a clapper plate which (1) is fixed from rotation with respect to the axis, and (2) is movable axially between (a) a first, unactuated position in which said brake is not applied and (b) a second, actuated position in which said friction disk is clamped between said clapper plate and said reaction plate to apply said brake; and(D) a field cup assembly including(1) a coil which is selectively energizeable to drive said clapper plate to move from one of said first and second positions to the other of said first and second positions, and(2) a field cup including (a) an axially-outer body which houses said coil, and (b) a skirt which extends from said body, over said clapper plate and said friction disk, and to said reaction plate, said skirt being attached to said reaction plate so as to encase said clapper plate, said friction disk, and at least an inner axial surface of said reaction plate.