Finite Element (FE) Analysis of Meshing Performance of a Theoretical Assembling Symmetrical Bevel Gear Differential

2012 ◽  
Vol 152-154 ◽  
pp. 753-758
Author(s):  
Song Deng ◽  
Lin Hua ◽  
Xing Hui Han ◽  
Song Huang
Keyword(s):  
Contact Stress ◽  
Planetary Gear ◽  
Transmission Error ◽  
Bevel Gear ◽  
Tooth Surface ◽  
Fe Model ◽  
End Effect ◽  
Software Environment ◽  
Surface Contact ◽  
Gear Differential

The aim in this paper is to analyze tooth surface contact stress and transmission errors, verify existence of tooth end effect and discuss symmetry of symmetrical bevel gear differential (SBGD), etc. With this aim, a 3D elastic FE model of SBGD is established under the ANSYS software environment and its meshing characteristic is determined. Starting from here, by analyzing stress and circumferential displacement of tooth, the phenomena of stress concentration is acquired; the distribution of tooth surface contact stress is studied; tooth end effect is confirmed; transmission error is assessed. The analysis is ended by assessing the symmetry of SBGD. Research results provide valuable guidelines for the design of SBGD. The developing model method proposed in this paper makes it possible to study other complex gear mechanisms such as planetary gear system.

Influence of the backlash generated by tooth accumulated wear on dynamic behavior of compound planetary gear set

2016 ◽  
Vol 231 (11) ◽  
pp. 2025-2041 ◽  
Author(s):  
Shijing Wu ◽  
Haibo Zhang ◽  
Xiaosun Wang ◽  
Zeming Peng ◽  
Kangkang Yang ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
Dynamic Behavior ◽  
Planetary Gear ◽  
Tooth Wear ◽  
Transmission Error ◽  
Gear Transmission ◽  
Tooth Surface ◽  
Contact Ratio ◽  
The Impact

Backlash is a key internal excitation on the dynamic response of planetary gear transmission. After the gear transmission running for a long time under load torque, due to tooth wear accumulation, the backlash between the tooth surface of two mating gears increases, which results in a larger and irregular backlash. However, the increasing backlash generated by tooth accumulated wear is generally neglected in lots of dynamics analysis for epicyclic gear trains. In order to investigate the impact of backlash generated by tooth accumulated wear on dynamic behavior of compound planetary gear set, in this work, first a static tooth surface wear prediction model is incorporated with a dynamic iteration methodology to get the increasing backlash generated by tooth accumulated wear for one pair of mating teeth under the condition that contact ratio equals to one. Then in order to introduce the tooth accumulated wear into dynamic model of compound planetary gear set, the backlash excitation generated by tooth accumulated wear for each meshing pair in compound planetary gear set is given under the condition that contact ratio equals to one and does not equal to one. Last, in order to investigate the impact of the increasing backlash generated by tooth accumulated wear on dynamic response of compound planetary gear set, a nonlinear lumped-parameter dynamic model of compound planetary gear set is employed to describe the dynamic relationships of gear transmission under the internal excitations generated by worn profile, meshing stiffness, transmission error, and backlash. The results indicate that the introduction of the increasing backlash generated by tooth accumulated wear makes a significant influence on the bifurcation and chaotic characteristics, dynamic response in time domain, and load sharing behavior of compound planetary gear set.

Investigation of Noise Features of Planetary Gear Trains Based on Human Aural Characteristic

2017 ◽  
Author(s):  
Masao Nakagawa ◽  
Dai Nishida ◽  
Deepak Sah ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama
Keyword(s):  
Gear Tooth ◽  
Structural Complexity ◽  
Planetary Gear ◽  
Transmission Error ◽  
Sound Level ◽  
Tooth Surface ◽  
Surface Error ◽  
Planetary Gear Trains ◽  
Tooth Stiffness ◽  
Gear Trains

Planetary gear trains (PGTs) are widely used in various machines owing to their many advantages. However, they suffer from problems of noise and vibration due to the structural complexity and giving rise to substantial noise, vibration, and harshness with respect to both structures and human users. In this report, the sound level from PGTs is measured in an anechoic chamber based on human aural characteristic, and basic features of sound are investigated. Gear noise is generated by the vibration force due to varying gear tooth stiffness and the vibration force due to tooth surface error, or transmission error (TE). Dynamic TE is considered to be increased because of internal and external meshing. The vibration force due to tooth surface error can be ignored owing to almost perfect tooth surface. A vibration force due to varying tooth stiffness could be a major factor.

scholarly journals Distribution of Microstructure and Vickers Hardness in Spur Bevel Gear Formed by Cold Rotary Forging

2014 ◽  
Vol 6 ◽  
pp. 809276 ◽  
Author(s):  
Wuhao Zhuang ◽  
Lin Hua ◽  
Xinghui Han ◽  
Liying Dong
Keyword(s):  
Vickers Hardness ◽  
Gear Tooth ◽  
Effective Strain ◽  
Bevel Gear ◽  
Fe Model ◽  
Software Environment ◽  
Rigid Plastic ◽  
Rotary Forging ◽  
Bevel Gears ◽  
Cold Rotary Forging

Cold rotary forging is a novel metal forming technology which is widely used to produce the high performance gears. Investigating the microstructure and mechanical property of cold rotary forged gears has a great significance in improving their service performance. In this study, the grain morphology in different regions of the spur bevel gear which is processed by cold rotary forging is presented. And the distribution regulars of the grain deformation and Vickers hardness in the transverse and axial sections of the gear tooth are studied experimentally. A three-dimensional rigid-plastic FE model is developed to simulate the cold rotary forging process of a spur bevel gear under the DEFORM-3D software environment. The variation of effective strain in the spur bevel gear has been investigated so as to explain the distribution regulars of the microstructure and Vickers hardness. The results of this research thoroughly reveal the inhomogeneous deformation mechanisms in cold rotary forging of spur bevel gears and provide valuable guidelines for improving the performance of cold rotary forged spur bevel gears.

182 Tooth Surface Contact Stress of the Normalized Conical Involute Gear

2012 ◽  
Vol 2012.47 (0) ◽  
pp. 170-171
Author(s):  
Tomoyuki TAMAMIZU ◽  
Tatsuya OHMACHI ◽  
Hidenori KOMATSUBARA
Keyword(s):  
Contact Stress ◽  
Tooth Surface ◽  
Involute Gear ◽  
Surface Contact

Tooth Surface Contact Stress Analysis of the Straight Bevel Gear Axial Practice

2013 ◽  
Vol 401-403 ◽  
pp. 345-349
Author(s):  
Jia Jia Lou ◽  
Xue Mei Cao ◽  
Ji Song Jiao
Keyword(s):  
Stress Analysis ◽  
Contact Stress ◽  
Bevel Gear ◽  
Tooth Surface ◽  
Element Analysis ◽  
Surface Distribution ◽  
Straight Bevel Gear ◽  
Static Contact ◽  
Contact Models ◽  
Grid Nodes

The program of tooth surface and gear inside grid nodes is developed according to the tooth surface equation. Finite Element Analysis of the straight bevel gear axial practice model is established. Order flow contact models of the three teeth and contact pair of gears of the three teeth is developed by APDL language of ANSYS. The static contact stress analysis of axial practice is constructed. The static contact stress of tooth surface distribution and change rule is obtained by calculating. The result shows that axial practice pair of gears of have good meshing performance.

Analysis of Helicopter Main Reducer Planetary Gear Contact Strength

2013 ◽  
Vol 273 ◽  
pp. 180-183
Author(s):  
Peng Liu ◽  
Ying Ming Li ◽  
Kang Huang ◽  
Qi Chen
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Planetary Gear ◽  
Theoretical Method ◽  
Simulation Method ◽  
Gear Train ◽  
Tooth Surface ◽  
Reduction Gear ◽  
Accurate Analysis ◽  
Gear Contact

Theoretical method and the finite element method for a helicopter main reduction gear of the planetary gear train are done this article. The contrast drawn: the reliability and accuracy of the finite element simulation method used in the calculation of tooth surface contact stress. Provides an effective approach for accurate analysis of helicopter main reduction planetary gear contact stress.

scholarly journals Analysis of Tooth Surface Contact Stress of Involute Spur Gear

2021 ◽  
Vol 2133 (1) ◽  
pp. 012037
Author(s):  
Yusheng Zhai ◽  
Jie Mu ◽  
Ruiguang Yun ◽  
Siran Jia ◽  
Jianfeng En ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Contact Stress ◽  
Simulation Analysis ◽  
Spur Gear ◽  
Tooth Surface ◽  
Analysis Model ◽  
Element Analysis ◽  
Element Simulation ◽  
Surface Contact

Abstract Through the establishment of a pair of spur gear contact models, based on Hertz contact theory, the tooth surface contact stress is calculated; then the Ansys finite element analysis software is used to simulate and analyse the stress distribution. Through the analysis and comparison of the two results, it is proved that the contact stress calculated by Hertz theory is relatively small, which is close to the results of the finite element simulation analysis. Theoretical calculation can verify the accuracy of the finite element simulation analysis model, and the finite element simulation analysis provides an effective way to accurately calculate the contact stress of the tooth surface.

Sign in / Sign up

Export Citation Format

Share Document