Analysis Of Beveloid Internal Gear Enveloping External-rotor Crown Worm Drive On Finite Element

Beveloid internal gear enveloping external-rotor crown worm drive were applied for a patent for invention by Wang Jinge.It has significant advantageous: firstly,the meshing method is internal meshing,which placing external-rotor motor in crown worm to form crown worm motor and making the support,transmission and drive into one,and greatly saving in drive space.Secondly,the internal gear is conjugately meshed with the crown worm generated by its enveloping,so that the worm drive has the characteristics of torus worm gear meshing.In addition,a wedge angle is formed in the direction of the tooth width and the flank clearance of the worm and the internal gear can be changed to reduce the backlash,reduce the vibration,improve the transmission accuracy,wear compensation and so on by adjusting the axial position of the variable-tooth thick worm gear and the internal gear.As a new type of worm drive,its compact structure makes the drive has a wide application prospect in the field of robotic joints.Beveloid internal gear enveloping external-rotor crown worm drive is one of the first-order enveloped worm drives in an inclined plane.At present,systematic research has been conducted on the manufacturing process.Systematical study of fabrication process of this new transmission set has been done.As a scientific research,more jobs need to be done on it.This paper takes the center distance 100 mm,transmission ratio 63 as the standard,utilizes the principle of space meshing,and combines finite element analysis methods to conduct contact research.The specific work is as follows:Using the principle of meshing engagement,the meshing mechanism of beveloid internal gear enveloping crown worm drive enveloping was analyzed,and the tooth surface equation,root tangent line and meshing limit function,induced normal curvature.on both sides of the worm were deduced.Impact on the contact area and contact line of the plane inclination of tooth surface of worm gear were discussed.In view of the numerical calculation Matlab software,the relationship between the key parameters in the crown worm was studied and the calculation program of the crown worm gear tooth surface was programmed to establish the mathematical model of the contact line of the crown worm tooth surface.Create accurate beveloid internal gear enveloping external-rotor crown worm drive model by 3D modeling software and numerical calculation software.The finite element analysis method was used to compare the contact state,tooth surface contact stress,contact pressure and maximum principal stress of beveloid internal gear enveloping crown worm drive and a general beveloid internal gear enveloping crown wormdrive under different mining conditions.Research,through the finite element software simulation of internal gear contact line,indexing circle,and the internal gear stress distribution,load distribution between the teeth were studied.The impact of center-to-center error,worm gear axial error,worm gear and worm axis misalignment on worm contact were analyzed.It provides theoretical guidance for the installation of the drive in practical applications.