Optimisation of cylindrical gear pairs: A review

Miler, Daniel; Hoić, Matija

doi:10.1016/j.mechmachtheory.2020.104156

Cited by 46 publications

(19 citation statements)

References 69 publications

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“…Improving gear modules and increasing gear width are frequently used to advance the load-carrying capacity of gear drives. However, these methods both have great limitations, such as increasing the size and reducing the power-to-weight ratio [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Load Capacity of High-Contact-Ratio Internal Spur Gear Drive with Arc Path of Contact

2022

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Tooth root bending stress and surface contact stress are two major determinants of the load carrying capacity of gear drives. Generally, a high contact ratio has the potential to enhance the gear strength. In this paper, the basic procedures and methods for constructing a high-contact-ratio (HCR) internal spur gear pair with the arc path of the contact are presented. The effects of design and modification parameters such as deflection angle, modification angle, and addendum coefficient on gear drive are analyzed in detail based on 2D finite-element models (FEMs). A comparison of experimental and finite-element analyses (FEA) of the bending stress, contact stress, and contact ratio between HCR and involute internal spur gear drives was conducted to demonstrate the advantages of the HCR gear drive in terms of load capacity. The results show that appropriately increasing the deflection angle and addendum coefficient is beneficial for reducing bending and contact stresses. It was also observed that the bending and contact stresses of a HCR pinion are lower than those of an involute one. Moreover, the contact ratio increases with input torque.

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Section: Introductionmentioning

confidence: 99%

Investigation of Load Capacity of High-Contact-Ratio Internal Spur Gear Drive with Arc Path of Contact

2022

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“…Gears are among the most important components of mechanical systems for power transmission. The main design trend of gear transmission systems is to maintain a highload and high-speed operation capacity to ensure a light weight [1][2][3][4][5]. The failure of key components, such as gears, in the transmission chain, results in the breakdown of the entire system.…”

Section: Introductionmentioning

confidence: 99%

“…There are two methods to extend the service life of gears. One is to enhance the strength of the material used for gear manufacturing, and the other is to reduce the stress that it endures [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces

Huang

Gao³

et al. 2022

Metals

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Pitting, which results from contact fatigue, is a common failure mode in gear transmission systems and is influenced by the material strength and stress state of the contact area, which is further influenced by lubrication and roughness because of stress fluctuations. In this study, a comparative contact-fatigue test was conducted on two types of gears with different terminal machining processes. The contact stress of the tooth surface considering the microtopography was analyzed using the fractal method based on surface microtopography data measured from the surface formed by the two processes. Test results show that the average service life of gears machined using the barrel-finishing process was approximately 5–7 times that of gears machined using grinding. The pitting morphologies of gears fabricated using different processes exhibited evident differences. The maximum stress level of the gears machined with barrel finishing was approximately twice that of the gears machined through grinding. Different stress levels resulted in different micropitting load-bearing capacities, which could be attributed to the different service lives of gears manufactured through different machining processes. The different presence features of the pitting morphology were due to the different micromorphologies of the surface formed by the different finishing processes. In particular, the randomly distributed pitting morphology of the gear surface machined using the barrel-finishing process was due to its flattening and polishing effect. Optimization of the surface-microgeometry distribution via the finishing process is an effective method for prolonging the service life of gears.

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“…Helical/double-helical gear pairs are widely used in marine, helicopter, mining, turbine, and other power transmission fields. Although the inborn higher contact ratio of helical gear pairs leads to lower vibration level of the system compared with spur gear systems, tooth surface modification is still usually used in the design of microparameters of helical/double-helical gear pairs in order to improve contact patterns and further reduce the vibration level of gear systems [1].…”

Section: Introductionmentioning

confidence: 99%

Tooth Surface Modification for Helical Gear Pairs considering Mesh Misalignment Tolerance

Han

Yuan

Qiao

2021

Shock and Vibration

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Mesh misalignment in mating the gear tooth surface is common and difficult to be determined accurately because of system deformation and bearing clearances, as well as manufacturing and assembly errors. It is not appropriate to consider the mesh misalignment as a constant value or even completely ignore it in the tooth surface modification design. Aiming to minimize the expectation and variance of static transmission error (STE) fluctuations in consideration of mesh misalignment tolerance, a multiobjective optimization model of tooth surface modification parameters is proposed through coupling the NSGA-II algorithm and an efficient loaded tooth contact analysis (LTCA) model. The modified tooth flank of helical gear pairs is defined using 6 design variables which are related to profile modification, lead modification, and bias modification. The influences of mesh misalignment on time-dependent meshing stiffness (TDMS) and STE of unmodified and modified helical gear pairs are investigated. Then, the dynamic transmission error (DTE) of modified helical gears in consideration of mesh misalignment is discussed. The results indicate that the designed modified tooth surface shows good robustness to mesh misalignment.

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Optimisation of cylindrical gear pairs: A review

Cited by 46 publications

References 69 publications

Investigation of Load Capacity of High-Contact-Ratio Internal Spur Gear Drive with Arc Path of Contact

Investigation of Load Capacity of High-Contact-Ratio Internal Spur Gear Drive with Arc Path of Contact

Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces

Tooth Surface Modification for Helical Gear Pairs considering Mesh Misalignment Tolerance

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