Patent ID: 6352140
Filing Date: 2002-03-05
Classification: F16D,H02K

Abstract:
Disc brake to be opened by torque, the disc brake being arranged between a drive shaft and a driven shaft and comprisingat least one brake wheel arranged on the driven shaft non-rotatably in the peripheral direction; at least one friction surface arranged to cooperate with the brake wheel; at least one spring device arranged to press the brake wheel axially against the friction surface; and means causing, by the action of the torque and torsion of the drive shaft and a possible countertorque of the driven shaft, the brake wheel and the friction surface to drift axially apart and, accordingly, the braking coupling between them to loosen against the spring force of the spring device, whereby the drive shaft and the driven shaft are interconnected in such a way that they may turn a restricted rotational angle with respect to each other and that means for causing said axial displacement and for loosening the braking coupling comprise cam means arranged between the brake wheel and the drive shaft, and whereby the cam means comprise a first annular cam path arranged on the brake wheel and a second similar cam path arranged on the drive shaft, which second cam path cooperates with the first cam path, wherein the restricted torsion between the drive shaft and the driven shaft with respect to each other is implemented by restricting the axial motion of the brake wheel to be smaller than the axial motion determined by the cam paths, whereby the torque is transmitted from the drive shaft to the driven shaft by means of a coupling between the cam paths.