Friction torque limiter

The utility model is a friction torque limiter relating to the technical field of preventive equipment of chain overload and decelerator of transportation machine under coal mine well.. Problems such as short life-span, poor preventive capability, low transportation power and hard maintenance exist in the traditional preventive equipment of chain overload and decelerator of transportation machine under coal mine well. The utility model comprises a fixed framework, friction slides, a set of axle sleeves and a set of springs; a pin axle, a base, bolts and a platen form the bracket with the spaces. Pressing sleeves, the bolts and the spline axle form the set of sleeves. The fixed bracket is arranged on the set of sleeves through two sets of bearings. The thick spacing board and the thick friction slides, as well as the thin friction slides and the thin spacing boards that are arranged alternatively between the former two, are arranged inside the spaces in the fixed bracket. The set of springs is to cover the spring onto the core axle and are arranged within the sleeve and fixed on the circumference within a space of the bracket. The device is of tight structure and transfers great power and is of great dependability and long life span.