Study On Modifcation And Meshing Performance Of The Double-enveloping Hourglass Worm Gearing

The double-enveloping hourglass worm gearing as a new mechanicaltransmission,because of its characteristic,such as having double contact ine,severalteeth meshing at the same time,the contact shape is beneficial to theelastohydrodynamic lubrication between the tooth surface,the small induced normalcurcature in normal direction of instantaneous contact line, the double-envelopinghourglass worm gearing widely used in transportation, military project, light industrymachinery and so on. In connection with the problem of design optimization, theinstallation error and modification in the double-enveloping hourglass worm gearing,This paper studies the following aspects.1.On the basis of the previous,studying the forming principle of the double-enveloping hourglass worm gearing. Derived equation of tooth surface of worm andworm wheel respectively.Building the theoretical basis for the followingresearch.Discuss the calculated principle of the double-enveloping hourglass wormgearing and and effects of various parameters were analyzed. The program ofparameter calculation was compiled in fortran language.Optimizing the mainparameters of the double-enveloping hourglass worm gearing.Building the3Dmodeling of the double-enveloping hourglass worm gearing.2.Building the finite element model of the double-enveloping hourglass wormgearing under ideal conditions and error state.Applied load on worm gear pair,studythe changes of tooth surface load under different load and error state.3.The operational principle of changed center distance and changed transmissionratio were analyzed.Studying the changes of modified parameter’s influence tomodified result in changed center distance and changed transmission ratio.Using thedistribution of contact line and the induced normal curvature radius to evaluate theperformance in macroscopic aspect and microscopic aspect. 4.Using changed center distance to worm.Combined with the existing gearhobbing machine to processe a worm.Finally,doing the rolling test of worm gear andverifying the contact trace.