SCREW ROTOR FOR OIL INJECTION TYPE SCREW COMPRESSOR

摘要

PROBLEM TO BE SOLVED: To always keep both of a female rotor and a male rotor each other in a surface contact state and prevent generation of pitching in a contact part by forming the contour of a rotor shaft perpendicular cross section of the contact part of both the rotors transmitting power from the female rotor to the male rotor into a rolling curve shape in which a rolling curve is rolled along each pitch circle of both the rotors. ;SOLUTION: A pitch point P is a contact of pitch circles PF, PM of each of a female rotor F and a male rotor M and is on a straight line 11 connecting centers OF, OM. A forwarding side tooth flank LF is constituted of a part LF_i at the inside of the pitch circle PF and a part LF_o at the outside of the pitch circle PF. A driving part LF_i at the inside of the forwarding side tooth flank LF becomes the locus of an intersection point A of the forwarding side tooth flank LF and the pitch circle PF on a circle C₁ to be one example of a rolling curve which is inscribed in the pitch circle PF at the intersection point A when the circle C₁ rolls along the inside of this pitch circle PF by determining the pitch circle PF for a base line.;COPYRIGHT: (C)1999,JPO