Study on the Optimization of Single Helical Gear Modification based on MAST A Software
In order to study the influence of different modification methods on gear performance,a pair of single helical gears were taken as an example to carry out linear relief,crowning relief and tip relief.MASTA software was used to carry out loaded tooth contact analysis(LTCA)for different modification schemes.The transmission error,contact stress of tooth surface and load distribution of tooth surface were calculated under various schemes.Taking uniform load distribution of tooth surface as optimization objec-tive,the transmission error and contact stress of tooth surface were comprehensively considered.Linear relief,crowning relief were carried out on the gear,and tip relief was carried out from three aspects in-cluding modification amount,modification length and modification curve.The optimized scheme under specific working conditions and specific gear parameters was obtained.The results show that the transmis-sion error of the gear can be reduced by 8.6％and the transmission error curve is closer to the sine curve when the load distribution on the tooth surface is more uniform than that without modification;the maxi-mum tooth surface contact stress is decreased by 6.2％;and calculated tooth surface load factor is also reduced from 1.195 2 to 1.144 5;the modification optimization scheme effectively improves the meshing performance of the gear.
tooth lead modificationgear tip relieftransmission errortooth surface contact stress
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