CONTROL DEVICE FOR AN MAXIMUM ROTATIONAL SPEED ON A ROTOR OF AIR TOOL

摘要

PURPOSE: A device for controlling maximum rotational speed of a rotor of an air tool, which can prevent the decrease of torque by attaching a magnet to a rotary shaft is provided to control the rotation speed of a solenoid valve and current generated by the rotation of a rotor. CONSTITUTION: A device for controlling maximum rotational speed of a rotor of an air tool comprises a solenoid valve(41) and a spool(45). The solenoid valve is installed in a pneumatic supply pipe(3). The solenoid is operated with the current obtaining with a power generator. When the rotor exceeds the maximum rotating speed, the solenoid valve reduces the area of the stream passage. When the number of rotation downs, the spool downward moves using elasticity of a spring(43) and the area of the stream passage is magnified. Then, the highest rotation amount of rotor is automatically controlled.