| As the planetary gear mechanism with many advantages as follows,light weight,small size,big transmission ratio,high carrying capacity,smooth transmission and high transmissionefficiency and so on,it has been widely used in various types of shield cutter drive reducer athome and abroad currently.Planet carrier,as a key and basic output component of planetary geartransmission,has complex structure and heavy quality.It is prone to large deformation under theaction of the torque,which directly impact on carrying capacity and smooth transmission of theplanetary gear mechanism.However,the law of overall and local stress-strain can not be directlyand accurately calculated by the traditional methods of analysis.At the same time,finite elementanalysis software ANSYS,not only complicated manual operation,but also needs to model andmodify model repeatedly for the same type of structure,consuming a large amount of time.Inaddition,the secondary development language APDL in ANSYS for parametric modeling can beachieved,which can make up for the deficiency of manual operation.So in this paper,parametricmodeling of planet carriers at all levels of DGZ6reducer shield are established and analyzed byANSYS software and APDL.Access to large amounts of information,development andapplication of domestic and international shield,shield technology and the planetary gear drivehave been understood,and the research of planet carrier in finite element analysis software isfurther mastered,which make the main content,innovation,purpose and meaning of this researchmore clearly.The following specific researches have been finished.The internal structure,working principle and traditional route of DGZ6reducer shield arefamiliarized and the structure type and characteristics of all planet carriers is learned about.Theload values of planet carriers at all levels are calculated after analysis of the force process for2Z-X-type planetary gear transmission.The parametric finite element models for planet carriers at all levels are established byusing APDL programming language after making the element type,material properties,geometryand load size to parameters.Meanwhile,according to characteristics of spatial symmetry of thestructure,the two modeling methods,cycle symmetry model and full model,are raised for the firstplanet carrier.By comparing the results of both methods,the correctness of analysis of the cyclemodel instead of the full model is verified,which may be of referential significance to modelsimplification of the second and third planet carriers,especially,more valuable to nonlinearcontact analysis for all levels of planet carriers.The linear static analyses of all planet carriers are studied and comprehensive stress anddeformation of them are obtained in post-processor of ANSYS.Meanwhile,the deformation pathsare set in order to simulate the deformation curve and distribution of deformation along the givenpaths for two side panels of planet carriers.The results indicate that circumferential deformationis the main deformation affecting the deformation of planet carrier and also the deformation ofinput side is greater than that of output side.The nonlinear contact analyses for all planet carriers are studied.Based on thethree-dimensional contact theory of flexible body-flexible body,the specific steps of nonlinear contact analysis for planet carriers at all levels are elaborated and two key issues on convergenceare proposed.The superiority of contact analysis is reflected by comparison the results of thecontact analysis and linear analysis.The impact of the main structure parameters on deformation of a planet carrier is studied.Considered the third one as the research object,the parameters are changed by using APDLlanguage.Their impact on deformation of the planet carrier is analyzed by comparing valuesbefore and after deformation.Finally,an optimized design is introduced to seek a planet carrierwith light weight and large carrying capacity,which provides a good reference value for thedesigners. |
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