Study On The Roller Enveloping End Face Internal Engagement Worm Gear

For the current problems that there are several working loads to be solved in the driving field urgently.Based on the non backlash double roller enveloping hourglass worm gear driving and anti-backlash planar enveloping end face engagement worm gear driving,a novel driving device,named the roller enveloping end face internal engagement worm gear driving,is proposed in this paper.It’s the drive principle,meshing theory,worm geometric parameters design,meshing performance analysis and three-dimensional solid modeling and so on are studied respectively.The main contents are as follows:The composition structure and working principle of the roller enveloping end face internal engagement worm gear driving are described.Based on differential geometry and space gear meshing theory,the mathematical model and meshing theory system of this worm gearing with multi roller worm wheel are established by means of the envelope method of kinematics method.The engagement function,meshing equation,meshing surface equation and so on are deduced.The calculating formulae of key parameters the impacting tooth surfaces contact are obtained.The characteristics of the worm tooth surface are analyzed by means of numerical calculation tool.The axial section profile of the worm is gained by calculation.The tooth surface structure and characteristics of the end face internal engagement worm gear driving are studied.The contact line and variable diameter spiral line on worm tooth surface are drawn in MATLAB software.The main geometric parameters associated with gear meshing performance are studied clearly.According to the mesh theory of the drive,based on the numerical calculation software MATLAB,the calculation program of Meshing analysis is developed.The main characteristics of the drive and the key parameters on the performance of the drive are analyzed.In accordance with the transmission principle and forming principle of the roller enveloping end face internal engagement worm gear driving,the example of the roller enveloping end face internal engagement worm gear driving is designed,which’s center distance and of drive ratio are 60 mm and 18 respectively.The three-dimensional solid modeling of the drive is completed by Creo software.The steps of solid modeling are described in detail.In accordance with the structural form of double roller worm wheel in no backlash double roller hourglass worm,design of worm wheel structure is improved.The static assembly interference and assembly clearance check of the worm gear pair are completed in an environment of Creo/Assembly.The results we obtained demonstrate that the modeling accuracy of digital model is good and the theoretical derivation of mesh analysis is correct.Finally,the problems effecting modeling accuracy are discussed and some solutions are proposed.The foundation for the subsequent virtual design work of the roller enveloping end face internal engagement worm gear drive reducer is laid.