Patent ID: 8220610
Filing Date: 2012-07-17
Classification: F16D

Abstract:
1. An overload protection device for protecting a motor from overload, the overload protection device comprising: a shaft comprising a cylindrical shaft body and a driving portion on an end of the shaft body, for outputting torsion from the motor, and a load carrying member driven by the driving portion of the shaft for transmitting the torsion from the motor to a load to drive the load, the load carrying member comprising at least one magnetic member corresponding to the driving portion of the shaft, each of the at least one magnetic member comprising a first magnetic member rotatably fixed on the load carrying member and a second magnetic member fixed on the load carrying member, the first magnetic member being located between the second magnetic member and the driving portion of the shaft and the same pole sides of the first magnetic member and the second magnetic member being opposite to each other; wherein, the driving portion is engaged with the first magnetic member and drives the first magnetic member to rotate the load carrying member under the rated load of the motor, and the driving portion overcomes the repulsive force between the first magnetic member and the second magnetic member to rotate the first magnetic member relative to the load carrying member, thereby the driving portion is disengaged from the first magnetic member during an overload of the motor working.