Patent ID: 7077245
Filing Date: 2006-07-18
Classification: F16D

Abstract:
1. A torque controlled brake arranged between a drive shaft and a driven shaft, said brake comprising a brake disc/clutch disc arrangement arranged between the drive shaft and the driven shaft wherein the drive shaft and the driven shaft are co-axial and said brake/disc clutch arrangement comprising a first disc that is axially movingly but non-rotatably arranged on the driven shaft and a second disc that is axially movingly arranged between the first disc and the drive shaft, a first set of friction surface means arranged between the first disc and the second disc, a second set of friction surface means arranged between the second disc and a body of the brake, a spring arrangement arranged to axially press the discs and the first set and second set of friction surface means co-operating therewith against each other in order to achieve a braking engagement, and cam means arranged between the drive shaft and the brake disc/clutch disc arrangement, said cam means comprising a first cam part that is non-rotatably fastened to the drive shaft and a second cam part that is non-rotatably arranged on the second disc, the cam means causing by the impact of torque and rotation of the drive shaft and the possible countertorque of the driven shaft the relative axial position between the discs and the friction surface means to change in order to detach at least partly the braking engagement against a force caused by the spring arrangement, wherein the second disc is axially movingly arranged in relation to the second cam part, a third set of friction surface means is arranged between the second cam part and the first disc in order to move the torque from the drive shaft to the driven shaft, and the spring arrangement comprises a first spring array pressing the first disc towards the second cam part and a second spring array pressing the first cam part towards the second cam part, and that the spring force of the first spring array is considerably greater than the spring force of the second spring array, the first spring array and the second spring array being apart and completely separated from each other.