Patent ID: 7999426

Claim:
A motor overload protection device, the motor overload protection device connecting to a rotor of a motor, the motor overload protection device comprising: a loading wheel defining a central through hole for rotatably receiving the rotor of the motor; a driving gear fixed on the rotor; and at least one protecting gear unit rotatably fixed to the loading wheel and capable of rotating about a rotating axis spaced away from a rotating axis that the driving gear rotates about, the at least one protecting gear unit engaging the driving gear, a resistance between the at least one protecting gear unit and the loading wheel being predetermined, whereby when the load on the loading wheel is equal to or less than a maximum load of the motor, the driving gear engages the at least one protecting gear unit, the resistance between the at least one protecting gear unit and the loading wheel keeps the loading wheel and the at least one protecting gear unit together rotating around the rotor of the motor, and when the load is greater than the maximum load of the motor, the driving gear drives the at least one protecting gear unit to rotate relative to the loading wheel.