PURPOSE: To always maintain the appropriate clearance by rotating a driving rotor of a screw type compressor or the like to the normal direction and the reverse direction with a free rotor, and obtaining a backlash between gear surfaces on the basis of angle of rotation of both the driving rotor and the free rotor to adjust a set position of the rotor.
CONSTITUTION: At the time of adjusting work, a male rotor 4 is rotated and the gear surface of the male rotor 4 is made to abut on a female rotor 3, and when the female rotor 3 starts to rotate with the male rotor 4, the rotation of the male rotor 4 is stopped. At this stage, angle of rotation of each rotor 3, 4 is measured by rotary encoders 12, 13. Next, the female rotor 3 is rotated with the male rotor 4, and angle of rotation of each rotor 3, 4 is measured, and a change of the angle of rotation is measured. Thereafter, the male rotor 4 is rotated reversely to make the gear surface of the opposite side abut on the female rotor 3, and angle of rotation of each rotor 3, 4 at this stage is measured to obtain a backlash, and the rotor is set at a central position of the maximum error in the direction, where the backlash is small, among rotational errors at the time of normal rotation and reverse rotation.
WATANABE TOSHIYA
OGAWA MAKOTO
NAGATAKE SHIGEAKI
