Research Of Machinery Modem Design On Planetary Gear Transmission

Planetary gear transmission has advantages of small volume,light quality,big transmission ratio,carrying capacity,smooth transmission and high transmission efficiency than normal fixed axis gear transmission.Planetary gear transmission is not only suitable for high-speed,high power and can be used in low speed and heavy torque of mechanical device,these effects have a very important significance for modern mechanical transmission development.In planetary reducer design,the traditional static design method are more and more unadapted.The emerging dynamic design method are increasingly being identity and adoption.Based on 3Z(â…¡) type planetary reducer as the research object,the several aspects of multi-objective optimization ,three-dimensional modelling,virtual assembling,dynamic analysis,finite element analysis are studied,and the main contents are as follows:Considering the volume and efficiency of the 3Z(â…¡) type planetary reducer as object,the multi-objective optimization mathematical model of the reducer is established.And the multi-objective optimization of the volume and efficiency of the 3Z(â…¡) type planetary reducer is finished.The multi-objective optimization program is prepared.In the end,the volume and efficiency ratio of the gear reducer are improved than initial parameters.The parameterized modeling process of the gear,the modeling process of the each component of 3Z(â…¡) type planetary reducer and the virtual assembly of 3Z(â…¡) type planetary reducer are also discoursed.The CAE software ANSYS Workbench and its advantages compared with other CAE software are introduced.The modal analysis of 3Z(â…¡) type planetary reducer of the single supported center axis and double supported center axis are respectively finished.The vibration model and natural frequencies of the reducer are acquired.A conclusion is made that double support structure form is better than the single.Then based on the double supported central axis of the 3Z(â…¡) type planetary reducer,the tooth's bending strength of the sun-gear of the weakest link is checked.And the sun-gear is imported into AWE to analysis its static stress.The maximum stress is checked and the strength and stiffness of the material are respectively satisfied.Therefore,the rationality of the optimized 3Z(â…¡) type planetary reducer is proved.In order to overcome the defects of a gear simultaneous meshing three times in ADAMS,a new equivalent treatment method of 3Z(â…¡) type planetary reducer is tried.It can realize the kinematics simulation of 3Z(â…¡) type planetary reducer successfully.The rotational speed and the angle acceleration of the output gear are concluded.And the transmission ratio and the rationality of the structure are verified.