Research And Application Of Gear Modification Based On Meshing Dynamics

Gear is a very important part, it is widely used in the gear box. At present, the technology is developing towards high speed and heavy load, and the requirement of gear is more and more closely.Study of on gear dynamics and gear modification, the goal is to find out the relationship between the dynamic mesh force and modification, the selection of appropriate modification and modification curve to reduce and vibration and noise of the gear transmission. To establish the dynamic model of gear transmission,dynamic characteristic analysis of gear meshing. Conclution: The vibration of helical gear can produce torsion,axial and radial direction of the three in the process of meshing. The dynamic excitation of gear modification technology can effectively reduce the gear meshing,so as to inprove the dynamic response characteristics. And the ship unloader reducer main hoisting gear meshing simulation of motion analysis,obtained consistent with the theory analysis results,verify the correct of the theoretical analysis.Secondly, the simulation model of the gear meshing transmission is established, and the main input gear pair is input parameters, and the establishment of a flexible body model of the transmission gear pair, including:The 3D model and the MNF file of the flexible body are established.Generation, and the constraint conditions and loading conditions of gear drive. Select the impact parameter of the tooth surface, and then copy it. True motion for actual meshing gear pair work under the condition of force.By using the computer simulation technology, the analysis and comparison of several different methods of modification, and finally obtaining the optimal repair curve and the shape of the gear. Under different meshing positions corresponding to the gear modification quantity is solved firstly, and then tracing point method to profile modification implement precise fitting, building gear 3D model,the dynamic motion analysis of repair gear. Given the modification gear cutting to gears meshing force gragh in time domain, and compared four kinds of profile modification and modification of top gear's average, maximum and minimum mesh force, and finally drawing a conclusion:the best modification curve NIKKO such modification method can get in the gear.At present,the computer simulation technology and method of determining modification curve and modification parameters,is widely used in gear modification design of reducer in ship unloader.The computer simulation technology has more advantages,it can be extended to other types of gear tooth modification field.