The Impact of Sliding Friction on Tooth Root Stress Analysis of Spur Gears

2019 ◽  
Vol 43 (7) ◽  
pp. 459-465
Author(s):  
Chan IL Park
Keyword(s):  
Stress Analysis ◽  
Sliding Friction ◽  
Spur Gears ◽  
Tooth Root ◽  
The Impact ◽  
Root Stress

Viscoelastic Tooth Root Stress Analysis on Fiber Reinforced Thermoplastic Poly-Imide (TPI) Gears

2000 ◽  
Author(s):  
Gong Donghui ◽  
Ichiro Moriwaki ◽  
Kenji Saito
Keyword(s):  
Carbon Fiber ◽  
Stress Analysis ◽  
Power Transmission ◽  
Hysteresis Loss ◽  
Tooth Root ◽  
Fiber Reinforced ◽  
Standard Specimens ◽  
Sufficient Strength ◽  
Root Stress ◽  
Poly Imide

Abstract Although thermoplastic poly-imide (TPI) gears do not have sufficient strength for power transmission, carbon fiber reinforcement greatly improves the strength of TPI gears. Previous experimental research showed that although standard specimens made from carbon fiber reinforced (CFR) TPI has 2.4 times strength in static bending than specimens made from natural TPI, gears made from CFR-TPI yields bending fatigue strength about 10 times greater than gears made from natural TPI. The present paper explains this phenomenon using viscoelastic tooth root stress analysis. The experiments indicated that the natural TPI gears showed much larger viscoelasticity than the CFR-TPI gears. Thus, tooth root stresses were calculated for cases of large and small viscosity moduli. These calculations showed tooth root stress increased with the increase in the viscosity modulus. Also, viscoelasticity may induce heat due to hysteresis loss, and this heat should reduce gear durability. The increase in tooth root stress and the heat due to hysteresis loss must make the durability of the natural TPI gears very small. Therefore, the CFR-TPI can yield much more durable gears than the natural TPI.

scholarly journals Fast tooth root load capacity optimization based on improved design of hob geometry

2019 ◽  
Vol 287 ◽  
pp. 01011 ◽  
Author(s):  
Ray Uelpenich ◽  
Peter Tenberge
Keyword(s):  
Load Capacity ◽  
Optimization Methods ◽  
Spur Gears ◽  
Tooth Root ◽  
Manufacturing Costs ◽  
Root Fracture ◽  
Computational Speed ◽  
Performance Ability ◽  
Improved Design ◽  
Root Stress

The competitiveness of gearboxes is significantly influenced by their performance ability. Increasing the tooth root load capacity has always been in focus of current research because in case of a failure of the gearwheel due to a tooth root fracture, the complete gearbox fails. This paper presents a new calculation method that enables the optimization of hob geometries within a few minutes so that they lead to reduced stresses in the tooth root fillet of spur gears. This results in reductions of the maximum tooth root stress of 10% and more for most gearwheels. The manufacturing costs for the optimized hob are only influenced slightly. In order to increase the computational speed compared to purely FE-based optimization methods, the present paper shows a method in which the decisive part of the optimization process is based on an analytical equation which are derived by a small number of FE-calculations.

Comparison between 3D FEM and Standard ISO Tooth Root Stresses

2011 ◽  
Vol 488-489 ◽  
pp. 85-88
Author(s):  
Gordana Marunić ◽  
Goran Gregov ◽  
Vladimir Glažar
Keyword(s):  
Stress Analysis ◽  
Practical Interest ◽  
Fem Analysis ◽  
Geometrical Parameters ◽  
Tooth Root ◽  
3D Fem ◽  
Stress Calculation ◽  
Stress Behaviour ◽  
Root Stress ◽  
The Web

The paper deals with the discussion how nominal spur tooth root stress of thin-rimmed gear determined in accordance with the standard ISO 6336-3:2006, method B, agrees with the results of the 3D FEM stress analysis. The procedure proposed by standard ISO for the tooth root stress calculation doesn’t identify the stress behaviour related to mutual affects of characteristic thin-rimmed gear geometrical parameters. Therefore, the 3D FEM analysis of tooth root stress has been performed for gear structures with middle and offset web with various rim and web thickness. The rim thickness has covered and slightly overcome the backup ratio defined by ISO procedure, while the web thickness has covered the range of practical interest.

scholarly journals Root Stress Analysis of Internal Spur Gears by Theory of Elasticity

1986 ◽  
Vol 29 (250) ◽  
pp. 1287-1293
Author(s):  
Satoshi ODA ◽  
Kouitsu MlYACHIKA
Keyword(s):  
Stress Analysis ◽  
Theory Of Elasticity ◽  
Spur Gears ◽  
Root Stress

scholarly journals Tooth Root Stress Analysis of Hypoid Gears : 2nd Report, Evaluation of the Predicting Method Proposed

2000 ◽  
Vol 66 (652) ◽  
pp. 4033-4039
Author(s):  
Zhonghou WANG ◽  
Aizoh KUBO ◽  
Norio HATANAKA ◽  
Satoshi AOKI ◽  
C. Gosselin ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Tooth Root ◽  
Hypoid Gears ◽  
Root Stress

Tooth Root Stress Analysis of Gear Processed by Full Radius Hob Based on ANSYS/LS-DYNA

2012 ◽  
Vol 479-481 ◽  
pp. 1409-1413
Author(s):  
Yong Ma ◽  
Xin Hua Dong ◽  
Qi Huang
Keyword(s):  
Stress Distribution ◽  
Stress Analysis ◽  
Future Study ◽  
Optimization Design ◽  
Dynamic Contact ◽  
Tooth Root ◽  
Accurate Model ◽  
Time Changes ◽  
Set Up ◽  
Root Stress

According to principle of hobbing, this paper set up accurate model of gear processed by full radius hob based on ANSYS/LS-DYNA software. A dynamic contact analysis of gears are completed and we gets stress distribution of tooth root as time changes, making foundation for future study and optimization design of full radius hob.

scholarly journals Tooth Root Stress Analysis of Hypoid Gears : 1st Report, Introduction of Predicting Method for the Tooth Root Stress

2000 ◽  
Vol 66 (652) ◽  
pp. 4024-4032 ◽  
Author(s):  
Zhonghou WANG ◽  
Aizoh KUBO ◽  
Satoshi AOKI ◽  
Kaneto TAKEDA ◽  
C. Gosselin ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Tooth Root ◽  
Hypoid Gears ◽  
Root Stress
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