Patent ID: 9216443
Filing Date: 2015-12-22
Classification: B08B,H02K,Y10T

Abstract:
1. A drive system for a cleaning device for cleaning a tank, the drive system comprising a driving arrangement provided to rotate an input shaft connected to a gear box, wherein the gear box transfers rotation of the driving arrangement to a reduced rotation of a cleaning head in the tank, and wherein the input shaft is provided with a first coupling part in one end having a disc shape, the drive system is further equipped with a brake arrangement for regulating the speed of the driving arrangement, and the brake arrangement is comprised of a hysteresis part constituted by the first coupling part and at least one magnet held on a brake magnet holder, the brake magnet holder together with the at least one magnet and the coupling part being relatively movable to change a distance between the least one magnet and the coupling part, the brake magnet holder being positioned to arrange the at least one magnet in the vicinity of the first coupling part so that the at least one magnet interacts with the first coupling part of the driving arrangement to adjust the rotation of the first coupling part by changing the distance of the at least one magnet relative to the first coupling part.