Performance evaluation of high-contact-ratio gearing for combat tracked vehicles ― A case study

Sivakumar, P.; Gopinath, K.; Sundaresh, S.

doi:10.1243/09544070jauto1254

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…a contact ratio of two or more. As the percentage change in mesh stiffness for HCR meshes is lower than for normal contact ratio (NCR) meshes, one can expect high-quality HCR gear meshes to have lower mesh-induced vibration and noise than NCR gear meshes [11]. A ratio between 2 and 3 means 2 or 3 pairs of teeth are always in contact.…”

Section: Fig 3 Distribution Of Tooth Load In High Contact Ratio (Hcr)...mentioning

confidence: 99%

HCR Gearing and Optimization of its Geometry

Rackov

Vereš

Kanović

et al. 2013

AMR

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A special kind of the basic involute profile of non-standard gearing is called high contact ratio (HCR) gearing, where the contact ratio is higher, there are always at least two pairs of teeth in contact and the unit addendum height is not equal to one like for standard gearing. Thus, the tooth height is increased. When HCR gearing is used, it is not necessary to achieve a greater gear load capacity, but nevertheless there is a greater risk of interference due to the greater tooth height. The advantages of HCR gearing is higher resistance (load is distributed on more pairs of teeth at the same time) and a lower relative noise level of gearing, which can be significantly reduced by using an integer HCR factor. HCR profiles are more complicated than standard involute profiles, they have a greater predisposition for interference, pointed tip thickness and undercut of teeth during production (primary production interference). Due to increased addendum height, there is a larger possibility of some interference or pointed tooth tip occurring. Therefore, these issues need to be prevented in the design phase, and ensured that all relevant equations and constraints are satisfied. The described method of finding optimal gear parameter values uses a Generalized Particle Swarm (GPS) optimization algorithm and MATLAB. The GPS optimization is shown to be a very fast and reliable method.

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Section: Fig 3 Distribution Of Tooth Load In High Contact Ratio (Hcr)...mentioning

confidence: 99%

HCR Gearing and Optimization of its Geometry

Rackov

Vereš

Kanović

et al. 2013

AMR

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“…In a normal spur gear system, the force taken by each tooth during single teeth pair contact is relatively high, which has to be reduced for enhancement. 2, 3 Engaging high-contact-ratio gear is an effective technique 4, 5 of reducing the load on a single tooth. The main advantage of HCR gear is that its relative sliding velocity is less compared to the normal-contact-ratio (NCR) gear.…”

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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“…An HCR is usually designed by increasing the addendum coefficient of the gear [2]. Compared with gears that have a normal contact ratio, HCR gears effectively lower transmission error fluctuations, improve bearing capacity, and reduce the vibration level of the transmission system [3]. However, a variety of factors such as overload, improper installation, inadequate lubrication, and cracking can cause gear tooth failure, affecting the normal operation of the system and resulting in excessive vibrations and poor dynamic performance [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of localised tooth spall defect on dynamic performance of a high-contact-ratio spur gear system

Cheng¹,

Kang²,

Xiong³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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This study considers the tooth spall morphology and establishes a kinetic model of a high contact ratio gear pair system with an ellipsoid tooth spall defect. The mesh stiffness of the spalled gear system was evaluated using the potential energy method. To obtain the accurate dynamic response, the friction force was incorporated into the gear kinetic model. The dynamic transmission error and dynamic meshing force under different rotational speeds were acquired by the proposed model. The dynamics of a healthy gear system and spalled gear system was compared. The results reveal that the presence of the tooth spall defect alters the motion state of the system, making it prone to instability. The study provides a theoretical foundation for future research on spall defect diagnosis of gear transmission devices.

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Performance evaluation of high-contact-ratio gearing for combat tracked vehicles ― A case study

Cited by 8 publications

References 18 publications

HCR Gearing and Optimization of its Geometry

HCR Gearing and Optimization of its Geometry

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

Effect of localised tooth spall defect on dynamic performance of a high-contact-ratio spur gear system

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