The utility model relates to a clutch which solves the problem of performance enhancement. The utility model is characterized in that the front end of the main body of a shaft connector is mutually sheathed with a force input flange of the spring coiling type clutch via a screw hole; one side of the main body is provided with a cylinder of which the end is provided with an air inlet port connected with the main body via a delivery pipe; the interior of the main body is provided with a guide hole which is penetrated through by an output shaft with an air outlet hole from an output shaft hole on the other side of the spring coiling type clutch, and the air outlet hole is communicated with the pipelines of the main body; the other end of the output shaft is provided with a movable and rotatable air hole joint; a cylinder assembly of the main body is connected with a gin pole, a connecting body and an accessory body are arranged on the main body in order, and the parts of the shaft connector are screwed and locked by long screws. The utility model is used for a machine.