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Improved analytical model for mesh stiffness calculation of cracked helical gear considering interactions between neighboring teeth

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Science China(Technological Sciences) 2023年第3期66卷 706-720页

作者： NING JieYu CHEN ZaiGang ZHAI WanMing State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

As one of the most typical fault forms of the helical gear,the crack will change the dynamic excitation and further affect the dynamic behaviors of the transmission *** to the complicated structure of the helical gears,the coupling effect between the neighboring loaded teeth is usually ignored in the mesh stiffness calculation,making it considerably overestimated especially in the case of the crack *** improved mesh stiffness calculation method of helical gear with spatial crack is proposed to make up this *** interactions between the loaded neighboring teeth induced by the gear body flexibility were considered to improve the calculation accuracy and ***,the load distribution law for the engaged cracked tooth along the tooth width and profile can be *** results indicated that the mesh stiffness of the multi-tooth engagement calculation using this model could be further improved compared with the traditional ***,the effects of the helix angle,crack depth,and crack propagation length on the mesh stiffness and load distribution were investigated using the proposed method.

关键词： mesh stiffness helical gear structural coupling effect slice method spatial crack

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Mesh excitations of spur gear considering strong correlation among tooth contact parameters,contact force,and tooth profile deviations

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Science China(Technological Sciences) 2023年第9期66卷 2500-2516页

作者： LI ZhengFa CHEN ZaiGang ZHAI WanMing State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Gear mesh excitations are widely concerned in the dynamic studies of the gear transmission ***,intentional and unintentional tooth profile deviations often occur in *** present,the established calculation models of gear mesh excitations consider tooth profile deviations as displacement ***,gear mesh excitations calculated by such models have reduced stability compared with the actual ***,in this study,an improved analytical model of gear mesh excitations with tooth profile deviations is *** established model considers tooth profile deviations,extended tooth contact,and the structure coupling effect of the gear body *** importantly,the model considers the strong correlation among tooth contact parameters,contact force,and tooth profile deviations to better reflect the actual gear mesh.A calculation flowchart with a simple calculation method of contact forces is also proposed to calculate the gear mesh ***,the effects of tooth profile deviations on gear mesh excitations are *** results show that the effects of tooth profile deviations on tooth contact position,the direction of contact force,and equivalent basic circle radii should be considered in the calculation of gear mesh excitations because of smaller system transmission errors,larger double-teeth meshing area,and slighter extended tooth *** profile deviations also cause jumps in tooth contact position and time-varying mesh ***,our findings show that the proposed model can be used to calculate the gear mesh excitations more accurately when the tooth profile deviates greatly.

关键词： mesh stiffness extended tooth contact structural coupling effect tooth contact stability analysis

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维普期刊数据库

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