PURPOSE: To provide an actuator for a valve, capable of driving the valve into stepless and adjusting the valve into the suitable position in the electric interruption.
CONSTITUTION: An internal threaded hole 105a is formed inside a sleeve 105 as a rotary shaft of a motor, and a shaft 106 is screwed into the internal threaded hole 105a, so as to be moved into the shaft center CT direction, and a stopper-like valve 104 is provided on the end of the shaft 106 projecting from an opening end of the internal threaded hole 105a. Moreover, a tapered opening/ closing surface 104a is formed on the valve 104 in the shaft center CT direction, and a structure for preventing the rotation of the shaft 106 is provided between the shaft 106 and a case 111 of the motor, and a spiral spring 7 is provided between the sleeve 105 and the case 111, so that one end may be connected to the sleeve 105 and the other end may be connected to the case 111.
KOMAZAKI MASAHITO
OKAWA TAKANORI
