Tooth contact parameters analysis of the non-backlash double-roller enveloping hourglass worm gearing

The tooth contact parameters such as lubrication angle, induced normal curvature, entrainment velocity, et al. of the nonbacklash double-roller enveloping hourglass worm gearing and influencing factors are studied systematically. The averages of the lubrication angle, the induced normal curvature, the entrainment velocity and the roller´s rotation angle which located on a number of mesh lines are taken as meshing performance index. Based on numerical computation, the influences of the roller radius, the roller installation offset distance, the throat diameter coefficient and the drive center distance on the tooth contact parameters of the non-backlash double-roller enveloping hourglass worm gearing are described by using the contours. The results show that a superior performance worm gear can be obtained by choosing rationally geometry parameters when the center distance is between 250~450mm.