CAD System Development Of Non-Backlash Double-Roller Enveloping Hourglass Worm Gearing

Non-Backlash Double-Roller Enveloping Hourgass Worm Gearing consists of two parts about Double-Roller Worm Gearing and Enveloping Hourglass Worm Gearing.A study on this drive is significant in theory and valuable in practice for developing a kind of non-backlash worm gear sets with high precision and heavy load capacity.Mainly from the theoretical perspective,this dissertation investigates the meshing theory,meshing performance and digital design.The content of this research is as follows:The structure and the work principle of this worm gearing have been introduced.According to the theories of gear meshing,a set of meshing system of the double-roller enveloping hourglass worm gearing in an ideal state is established.Using kinematics method. The meshing function of this drive and worm tooth surface equations have been deduced. And,the formulas of contacting parameters which include normal curvature,lubrication angle,rotation angle and relatively entrainment velocity are derived.Using the software MATLAB ,a computer program has been complied. Analysing the drive's engagement performance and generating the tooth surface by the program. In order to complete these operations more convenient,a meshing engagement performance software of double-roller wormgear has been developed, which base on MATLAB GUI.The function of the software includes tooth generation, contacting-line analysis,induced normal curvature analysis,lubrication angle analysis,autorotation angle analysis and relatively entrainment velocity analysis. The software bring convenient to designer about modification and debugging and is beneficial to reasonable selection of parameters of double-roller enveloping hourglass worm gearing.The 3D parameter model of non-backlash double-roller enveloping hourglass worm is established in Pro/E. Based on VC++6.0 and Pro/TOOLKIT-the secondary development tool of Pro/ENGINEER,the visual system of the model is established.It realizes the fuction of model parameters interaction, regeneration, display and modification.The digital model is the foundation of the worm analysis,simulation and other research works.