scholarly journals Research on the Maximal Bearing Capacity Calculation of a New Double Ring Reducer Based on MATLAB

2015 ◽  
Vol 9 (1) ◽  
pp. 34-39
Author(s):  
Qiang Xu ◽  
Qi-sheng Xu ◽  
Dao-Yi Xu
Keyword(s):  
Bearing Capacity ◽  
Elastic Deformation ◽  
Gear Tooth ◽  
Bending Fatigue ◽  
Gear Teeth ◽  
Double Ring ◽  
Contact Points ◽  
Single Tooth ◽  
Capacity Calculation ◽  
Mathematical Relationships

The bearing capacity of a new double ring reducer increases with the increase of load because of the elastic deformation of the gear tooth. In order to solve the problem of its bearing capacity quantificationally, the concept of the maximal bearing capacity is put forward. Starting with that the single tooth bending stress is up to the bending fatigue strength, a mathematical model to determine the normal backlash of the gear teeth has been established, the maximal deformation of the single tooth has been determined. The mathematical relationships have also been setup between the normal backlashes of the tooth pairs, the maximal deformation and number of contact points, a corresponding MATLAB program is designed. The maximal bearing capacity of the reducer has been estimated through examples and proved by experiment. The results show that the calculation method is more effective and fully considers the factors that the elastic deformation of the gear tooth can increases its bearing capacity, so the structure of the reducer is more compact, which establishes the theory foundation for designing the reducer.

Gear root bending strength: a comparison between Single Tooth Bending Fatigue Tests and meshing gears

2021 ◽  
pp. 1-17
Author(s):  
Luca Bonaiti ◽  
Ahmed Bayoumi Mahmoud Bayoumi ◽  
Franco Concli ◽  
Francesco Rosa ◽  
Carlo Gorla
Keyword(s):  
Failure Modes ◽  
Bending Strength ◽  
Gear Tooth ◽  
Fatigue Tests ◽  
Bending Fatigue ◽  
Gear Design ◽  
Single Tooth ◽  
Actual Strength ◽  
Meshing Gears ◽  
Definition Of

Abstract Gear tooth breakage due to bending fatigue is one of the most dangerous failure modes of gears. Therefore, the precise definition of tooth bending strength is of utmost importance in gear design. Single Tooth Bending Fatigue (STBF) tests are usually used to study this failure mode, since they allow to test gears, realized and finished with the actual industrial processes. Nevertheless, STBF tests do not reproduce exactly the loading conditions of meshing gears. The load is applied in a pre-determined position, while in meshing gears it moves along the active flank; all the teeth can be tested and have the same importance, while the actual strength of a meshing gear, practically, is strongly influenced by the strength of the weakest tooth of the gear. These differences have to be (and obviously are) taken into account when using the results of STBF tests to design gear sets. The aim of this paper is to investigate in detail the first aspect, i.e. the role of the differences between two tooth root stress histories. In particular, this paper presents a methodology based on high-cycle multi-axial fatigue criteria in order to translate STBF test data to the real working condition; residual stresses are also taken into account

Effects of Rolling on Load Bearing Capacity of Sintered Metal Gears

2007 ◽  
Author(s):  
Takao Koide ◽  
Takatoshi Maemori ◽  
Teruie Takemasu ◽  
Kouitsu Miyachika ◽  
Chiaki Namba
Keyword(s):  
Bearing Capacity ◽  
Surface Properties ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Bending Fatigue ◽  
Gear Teeth ◽  
Sintered Metal

This paper describes the effects of surface rolling on the load bearing capacity of sintered metal gears. Sintered metal gears and rollers were surface-rolled under various amounts of rolling. The effects of rolling on the surface properties were examined by measuring the porosities and hardness near the surfaces of the rolled gear teeth and rollers. Bending fatigue tests for the surface-rolled sintered metal gears and contact fatigue tests for the rollers were carried out. The effects of the amount of rolling on the load bearing capacity of sintered metal gears and rollers were determined, and these results were compared with the results for as-sintered and wrought steel gears and rollers.

Dimensional Changes by Heat Treatment of Helical Gear

2013 ◽  
Vol 535-536 ◽  
pp. 271-274
Author(s):  
Jeongsuk Lim ◽  
Sunghoon Kang ◽  
Young Seon Lee
Keyword(s):  
Heat Treatment ◽  
Elastic Deformation ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Dimensional Change ◽  
Helical Gear ◽  
Tooth Profile ◽  
Dimensional Changes ◽  
Gear Teeth ◽  
Experimental Works

The dimensional change of tooth profile by heat treatment of helical gear was investigated by experimental and numerical approaches. Especially, the three-dimensional elasto-plastic finite element (FE) simulation was adopted to analyze the elastic deformation during load, unloading, ejecting of workpiece. Quenching simulation was also carried out to investigate the change of tooth profile on the forged gear. In experiments, the amount of elastic deformation of the forged gear was quantitatively determined by comparing the tooth profiles on the forged gear and die. The dimensional change of the forged gear tooth after quenching was also evaluated from the comparision of the cold forged and quenched gear teeth. From experimental works, it was found that the amounts of dimensional changes after forging and quenching of helical gear are 10 and 10 μm, respectively.

Investigation of bending fatigue strength limit of alloy steel gear teeth

2012 ◽  
Vol 226 (3) ◽  
pp. 615-625 ◽  
Author(s):  
X X Bian ◽  
G Zhou ◽  
Liwei ◽  
J Z Tan
Keyword(s):  
Alloy Steel ◽  
Endurance Limit ◽  
Statistical Data ◽  
Basic Number ◽  
Test Method ◽  
Bending Fatigue ◽  
Gear Teeth ◽  
Strength Limit ◽  
Single Tooth ◽  
Curve Extension

An experimental investigation was conducted on the single-tooth pulsating bending fatigue of 38SiMnMo alloy steel at a frequency range of 140–150 Hz. Using both up–down test method and S–N curve extension method, statistical data in terms of curves and endurance limits were analysed. The testing and analytical results indicated that the ‘platform’ of fatigue curves exists and the S–N curve cannot be extended to the cyclic basic number Nb in order to obtain the endurance limit. Furthermore, on the basis of the life distribution optimization, the three-parameter Weibull distribution was used for statistical data analysis. The statistical analysis showed that the bending endurance limit of 38SiMnMo alloy steel gears estimated at 99 per cent reliability and 95 per cent confidence was 284 MPa, which was located at the slightly low part of the mean line in the chart range illustrated in the standards ISO6336 and GB3480. The results demonstrated that the method described in this article was valuable.

The Gear Tooth Profile Form of the Mining Truck Wheel Edges Reducer Based on RomaxDesigner

2014 ◽  
Vol 602-605 ◽  
pp. 229-233
Author(s):  
Rong Hao Li ◽  
Jue Yang
Keyword(s):  
Bearing Capacity ◽  
Gear Tooth ◽  
Dump Truck ◽  
Motion Simulation ◽  
Mutation Load ◽  
Ac Drive ◽  
Single Tooth ◽  
Object Use ◽  
Simulation Results ◽  
Speed Fluctuations

When the wheel of the wheel edges reducer working, single tooth meshing and bidentate meshing alternately, Gear meshing dislocation, mutation load, speed fluctuations, engaging-in and engaging-out impact will inevitably appear. This paper take the wheel hub reducer based on 60t AC drive articulated dump truck as the research object, use romaxdesigner model and motion simulation analyze the wheel edges reducer. through the analysis obtain the stress and the longevity of gear. According to the simulation results correct the gear for the purpose of improving the bearing capacity of the gear and reducing meshing noise.

scholarly journals Autoencoder-based anomaly detector for gear tooth bending fatigue cracks

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Nenad Nenadic ◽  
Adrian Hood ◽  
Christopher Valant ◽  
Josiah Martuscello ◽  
Patrick Horney ◽  
...  
Keyword(s):  
Anomaly Detection ◽  
Gear Tooth ◽  
Fatigue Cracks ◽  
Detection Performance ◽  
Data Driven ◽  
Bending Fatigue ◽  
Gear Teeth ◽  
Condition Indicators ◽  
Anomaly Detector ◽  
Classical Vibration

The article reports on anomaly detection performance of data-driven models based on a few selected autoencoder topologies and compares them to the performance of a set of popular classical vibration-based condition indicators. The evaluation of these models employed data that consisted of baseline gearbox runs and the associated runs with seeded bending cracks in the root of the gear teeth for eight different gear pairings. The analyses showed that the data-driven models, trained on a subset of baseline data outperformed classical CIs as anomaly detectors.

Gear Tooth Bending Fatigue Life Prediction Using Integrated Computational Material Engineering

2017 ◽  
Author(s):  
Michael E. Oja ◽  
Carlos H. Wink ◽  
Nikhil Deo ◽  
Robert L. McDaniels ◽  
Robert G. Tryon ◽  
...  
Keyword(s):  
Gear Tooth ◽  
Fatigue Behavior ◽  
Computational Method ◽  
Vehicle Group ◽  
Cyclic Life ◽  
Bending Fatigue ◽  
Damage Models ◽  
Microstructural Damage ◽  
Single Tooth ◽  
Physical Testing

The paper presents a computational method to predict the cyclic life of gears subjected to single tooth bending fatigue, using VEXTEC’s VPS-MICRO® software. The project was a collaborative effort between Eaton - Vehicle Group and VEXTEC Corporation to replicate physical testing virtually, more specifically to virtually determine bending fatigue curves of gears made from different steels. VPS-MICRO is based on VEXTEC’s patented Virtual Life Management® (VLM®) technology which includes computational microstructural damage models to simulate the fatigue performance and calculate the lifetime of various product configurations. The framework probabilistically estimates the fatigue behavior of a range of Eaton gears and other products.

scholarly journals Experimental Analysis of Residual Stress and Bending Strength of Gear Tooth Surface after Shot Peening Treatment

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Dong Liang ◽  
Sheng Meng ◽  
Yi Chen ◽  
Chengli Hua
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Shot Peening ◽  
Bending Strength ◽  
Gear Tooth ◽  
Tooth Surface ◽  
Bending Fatigue ◽  
Gear Teeth ◽  
Tooth Surfaces ◽  
Bending Fatigue Strength

The fatigue strength of a gear tooth surface is affected by various factors, which subsequently impacts the transmission performance of gears. Usually, shot peening treatment is carried out during processing to improve the performance of gears. Most current studies focus on theoretical descriptions and simulation analyses of shot peening treatment. However, in this paper, the relationships among shot peening treatment, residual stress, and bending fatigue strength of a gear tooth surface are discussed, through experimental methods. Based on X-ray stress analysis, at select locations on the test samples, the residual stresses on gear tooth surfaces with and without shot peening treatment are determined and contrasted. The results show that shot peening treatment can effectively increase the residual stress on gear tooth surfaces. In addition, an electromagnetic resonance fatigue tester is used to analyze the bending fatigue strength of gear tooth surfaces. The test results indicate that the bending fatigue strength of the gear teeth with shot peening is higher than that of the gear teeth without shot peening. The obtained conclusions lay the foundation for further practical engineering applications of gears.

scholarly journals Bending Fatigue Behavior of 17-4 PH Gears Produced by Additive Manufacturing

2021 ◽  
Vol 11 (7) ◽  
pp. 3019
Author(s):  
Franco Concli ◽  
Luca Bonaiti ◽  
Riccardo Gerosa ◽  
Luca Cortese ◽  
Filippo Nalli ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Specific Resistance ◽  
Fatigue Behavior ◽  
Powder Bed ◽  
Bending Fatigue ◽  
Experimental Campaign ◽  
Single Tooth ◽  
Final Failure ◽  
Effective Design ◽  
Resistance Data

The introduction of Additive Manufacturing (AM) is changing the way in which components and machines can be designed and manufactured. Within this context, designers are taking advantage of the possibilities of producing parts via the addition of material, defining strategies, and exploring alternative design or optimization solutions (i.e., nonviable using subtractive technologies) of critical parts (e.g., gears and shafts). However, a safe and effective design requires specific resistance data that, due to the intrinsic modernity of additive technologies, are not always present in the literature. This paper presents the results of an experimental campaign performed on gear-samples made by 17-4 PH and produced via Laser Powder Bed Fusion (PBF-LB/M). The tests were executed using the Single Tooth Bending Fatigue (STBF) approach on a mechanical pulsator. The fatigue limit was determined using two different statistical approaches according to Dixon and Little. The obtained data were compared to those reported in the ISO standard for steels of similar performance. Additional analyses, i.e., Scanning Electron Microscopy SEM, were carried out to provide a further insight of the behavior 17-4PH AM material and in order to investigate the presence of possible defects in the tested gears, responsible for the final failure.

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