Analysis of Dynamic Load of Spur Gears Considering the Gear Body Stiffness and Tooth Profile Modification

doi:10.3969/j.issn.1000-1093.2018.06.026

Abstract

Abstract: The influences of gear bodies, input speed, torque and tip relief on dynamic load of gear pair are studied to solve the low power density and high dynamic load of spur gear for high speed heavy-duty vehicles. A gear mesh stiffness model is established for spur gear, in which the gear body stiffness, profile modification and actual motion state of gear are considered. The gear mesh stiffness model is coupled into the 10 degrees-of-freedom lateral-torsional-rocking nonlinear dynamic model of a single stage gear system. The results show that the dynamic load of gear changes in the form of hump-like shape with the increase in speed, and the change trend of dynamic load remain almost the same at many rotating speeds. While the dynamic load of light-weight gear are much larger at various speeds, especially the amplitudes corresponding to the second- and sixth-order harmonics of mesh frequency of dynamic mesh force are obviously increased. With the increase in torque, the dynamic load of gear body is reduced in the form of a parabola, while the dynamic load of light-weight gear reaches to its local maximum. With the increase in tip relief amount, the dynamic load changes in the form of “U” type, and an optimal amount of tip relief exists to make the dynamic load reach to the minimum. While the amount of tip relief exceeds the optimal value, the dynamic load of light-weight gear changes more slightly. For short length of tip relief, the dynamic load appears in the form of “U” type. For long length of tip relief, the dynamic load factor is sharply reduced, which means that the long length of tip relief can more effectively reduce the dynamic load.Key

Key words: spurgear, meshstiffness, profilemodification, dynamicload

CLC Number:

TH132.413

LI Chun-ming, WANG Cheng, DU Ming-gang, ZHAO Zhi-gang. Analysis of Dynamic Load of Spur Gears Considering the Gear Body Stiffness and Tooth Profile Modification[J]. Acta Armamentarii, 2018, 39(6): 1239-1248.

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第39卷第6期
2018 年6月兵工学报ACTA
ARMAMENTARIIVol.39No.6Jun.2018

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