GEAR TRAIN OF SCREW MACHINE Russian patent published in 1999 - IPC

FIELD: screw compressors and expansion machines. SUBSTANCE: teeth of proposed gear train have asymmetric two-sided profile; sections of tooth dedendum of drive screw are described by arcs of circles smoothly engaging the profiles of drive screw with internal diameter of drive screw. Sections of addendum part of tooth of driven screw are described by arcs of circle smoothly engaging the profiles of driven screw with external diameter of driven screw; radius of drive screw on side described by epicycloid is equal to 0.015-0.020 of external diameter of drive screw and radius of drive screw on side described by arc of circle is equal to 0.030-0.050 of external diameter of drive screw. Radius of driven screw on side described over elongated epicycloid is equal to 0.010-0.015 of external diameter of drive screw; radius of driven screw on side described over profile engageable with circumferential part of drive screw is equal to 0.020-0.040 of external diameter of drive screw. EFFECT: avoidance of distortion of profile in course of cutting screws; facilitated procedure due to use of one mill; enhanced efficiency. 2 dwg