Determination of load dependent gear loss factor on asymmetric spur gear

Sekar, R. Prabhu

doi:10.1016/j.mechmachtheory.2019.02.011

Cited by 16 publications

(8 citation statements)

References 25 publications

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“…The pressure angle at the loading side is greater than on the unloading side, so the asymmetrical gearing has a higher tooth surface durability and higher root load capacity than the symmetrical gearing [16] to [18]. Sekar [19] discusses the friction between the tooth flanks as a function of geometric parameters and load. The author proves that power losses are smaller than with classical involute gears.…”

Section: Involute Gearsmentioning

confidence: 99%

Operating Performance of External Non-Involute Spur˝and Helical Gears: A Review

Okorn

Nagode

Klemenc

2021

SV-JME

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In practical use, most gears have an involute shape of tooth flanks. However, external involute gears have some drawbacks, such as unfavourable kinematic conditions at the beginning and end of meshing, a limited minimum number of teeth, and the highly loaded convex-convex (i.e., non-conformal) contact. Researchers have developed and analysed various non-involute forms of tooth flanks, but they have not been widely accepted. The main reasons are higher manufacturing costs and sensitivity to manufacturing and assembly errors. Analyses of non-involute forms of teeth are mostly theoretical (analytical and numerical), while there is a lack of experimental confirmations of theoretical assumptions. This paper reviews external non-involute shapes, their operating characteristics and possibilities of use compared to involute gears. Established criteria, such as Hertzian pressure, oil film thickness, bending stress at the root of the tooth, contact temperature, and gear noise, were used for assessment. The results of analytical studies and experimental research on S-gears are presented in more detail. S-gears have a higher surface durability and a lower heat load when compared to involute gears. The usability of non-involute gears is increasing with the development of new technologies and materials. However, the advantages of non-involute shapes are not so significant that they could easily displace involute gears, which are cheaper to manufacture.

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Section: Involute Gearsmentioning

confidence: 99%

Operating Performance of External Non-Involute Spur˝and Helical Gears: A Review

Okorn

Nagode

Klemenc

2021

SV-JME

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“…All 2D simulations were performed on middle teeth under plane stress conditions with 6 mm face-width gears. Sekar 23,24 studied the tooth wear of polymer gear under 2D plane strain with unit face width. Stress was observed in the subsurface region from the contact point.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study on Hertzian contact stress behaviour of engineering thermoplastic gears using 3D finite element analysis

Sugunesh

Mertens

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Two-dimensional Finite Element Analysis is frequently utilized to determine the behaviour of gear contact stress due to its computational time and higher efficiency. Based on the gear tooth-to-face width ratio, either plane stress or plane strain was selected in the investigations. However, the existing investigations failed to explain the above selection criteria. Thus, the present work attempted to do detailed contact stress investigations for all thermoplastic gears using 3D FEA and compared them with 2D FEA. Based on the criteria, the face widths of 5 and 20 mm were selected during the 3D analyses, replicating the plane stress and plane strain conditions of the 2D analysis. Contact stress variations with respect to face width were extracted at 10 distinct locations. For both 5 and 20 mm gears, higher contact stresses were obtained on gear edges, whereas lesser contact stresses were in the centre regions of the gear. For all the analysed thermoplastic gears, 5 and 20 mm face-width gears exhibited plane stress conditions. Subsurface and surface stress was detected during 3D and 2D analysis for both gears. For PP, the maximum contact stress occurred at the lowest depth value of 0.15–0.155 mm, and PC exhibited maximum contact stress at 0.275–0.28 mm depth. A dimensionless ratio of proportional limit – to – young’s modulus was introduced to predict the maximum contact stress depth for the thermoplastic gears. And it was observed that the ratio is directly proportional to the maximum contact stress depth value.

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“…Even though the Velex model included the friction coefficient in their study it failed to include the varying contact load for predicting the gear loss factor. Based on these studies on the gear loss factor a generalized model 38,39 was suggested by the authors 40 in their previous work for predicting the gear loss factor using the contact load and sliding velocity in symmetric and asymmetric normal contact ratio gear drives.…”

Section: Introductionmentioning

confidence: 99%

Load share model based gear loss factor prediction in high contact ratio spur gear drive

Ravivarman

Sekar

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Gear loss factor is considered to be a crucial parameter, and is governed by factors like contact load, sliding velocity, contact ratio, etc. Sliding power loss is a function of the gear loss factor and friction coefficient. It depends on the contact tooth load and its contact surfaces. A small decline in the gear loss factor and variation in the friction coefficient reduces the energy consumption which improves gear efficiency significantly. Hence, accurate prediction of the gear loss factor is important. This paper deliberates on measuring the contact load of High Contact Ratio (HCR) non-standard gear drive, using the finite element contact model. The input for the gear loss factor is obtained from a 2D elastic contact model using ANSYS. In the previous works the load is considered as a rigid hypothetical element, but in the real case it is varying at each instantaneous contact point. To address this, a more accurate method of predicting the power loss using the contact load share model is proposed. The effectiveness of this technique, built on the computational data and its accuracy are examined. Based on the accuracy, the load share model was suggested to be the most effective one compared to other techniques. The results show that the proposed model provides an effective tool for making reliability assessments on power loss and efficiency of high contact ratio gear drives under diverse operating conditions.

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Determination of load dependent gear loss factor on asymmetric spur gear

Cited by 16 publications

References 25 publications

Operating Performance of External Non-Involute Spur˝and Helical Gears: A Review

Operating Performance of External Non-Involute Spur˝and Helical Gears: A Review

A comprehensive study on Hertzian contact stress behaviour of engineering thermoplastic gears using 3D finite element analysis

Load share model based gear loss factor prediction in high contact ratio spur gear drive

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