Two-level calculation method for tribojoints made of disperse-reinforced composites: Part 1

Kornienko

Proceedings of the Institution of Mechanical Engineers, Part J:

et al. 2021

The estimation and the analysis of the arising contact pressures and tribotechnical parameters, that is, wear and durability, of metal-polymer spur gears using the author's computational method are presented in this study. Gears with a steel gear and pinion made of polyamide PA6 modified with dispersed carbon fibers (CF) or glass fibers (GF) whose content was 30%, PA6 + 30CF and PA6 + 30GF correspondingly, are studied. This took into account the parity of engagement, the effect of composite pinion teeth wear and gear correction. Quantitative and qualitative regularities of change of the specified parameters depending on composite type and gear correction type are established. It is found that the teeth wear of composite toothed wheels has a significant effect on reducing the values of the initial maximum contact pressures in the engagement. The distribution of linear wear along the teeth working profile and the localization of its maximum values, depending on the correction of engagement, are determined. The minimum durability of metal–polymer gears is calculated by simplified and improved methods. The optimal values of the correction coefficients at which the minimum durability is highest for both combination types of metal–polymer gears with height and angular teeth correction are established. The durability of metal–polymer gears with a driving pinion made of PA6 + 30CF composite calculated with the improved method is about seven times higher than the pinion made of PA6 + 30GF composite. In contrast to the methods of calculation of metal gears known from publications, the method presented in this study takes into account such practically significant factors as change of radii of tooth profile curvature owing to wear, their correction and number of teeth pairs at the engagement. In metal–polymer gears, there are no analytical calculation methods for modelling wear and tribological durability compared with that of the author's method.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of contact and tribotechnical parameters of metal–polymer gears taking into account wear and correction of teeth

Kornienko

Proceedings of the Institution of Mechanical Engineers, Part J:

et al. 2021

Adv. Sci. Technol. Res. J.

“…It must be stressed that in comparison to steel, the mechanical properties of metal-polymer (MoP) gears are 10 times lower while their Young's modulus is lower from 40 to 50 times, which has a significant effect on their deformation and thus service life and wear. The calculation methods [1,10,11,13,14,18,19,22,23] widely use Archard's law of adhesive/abrasive wear for metal toothed gears. However, this type of wear practically does not occur either in metal gears in maximum lubrication conditions or in metal-polymer gears in dry friction conditions.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Service Life of Metal-Polymer Gears Made of Glass and Carbon Fibre-Reinforced Polyamide, Considering the Impact of Height Correction

Chernets¹,

Kornienko²

2020

Calculation methods for predicting the service life of metal-polymer gears with height correction are proposed. Two methods for gear service life estimation are presented: a simplified method that assumes constant tooth interaction conditions and an improved method that takes into account wear-induced changes in tooth interaction conditions. Spur cylindrical gears with a steel gear and a pinion made of polyamide composite reinforced with carbon and glass fibres are studied. The effect of height correction on the service life of the gears is examined, considering the type of tooth engagement. It is established that with the improved method the service life of the gear is by up to 1.3 times longer than that calculated by the simplified method at optimal height correction coefficients. Optimal service life of the gear is achieved when the correction coefficients are x 1 = -x 2 = 0.1. The effect of the coefficient of friction on gear service life is investigated. It is found that the service life of the gear with a carbon fibre-reinforced pinion is by 8.1...9.3 times longer than that of the gear with a glass fibre-reinforced pinion.

Eksploatacja i Niezawodność – Maintenance and Reliability

“…However, there are no other studies of this nature in the literature. More information about the contact and bending strengths of metal-polymer gears determined by well-known methods is given in [1,23,25,27] dentition correction is used.…”

Section: Introductionmentioning

confidence: 99%

Method of calculation of tribotechnical characteristics of the metal-polymer gear, reinforced with glass fiber, taking into account the correction of tooth

Chernets¹

2019

Method of calculation of tribotechnical characteristicsof the Metal-polyMer gear, reinforced with glass fiber, taking into account the correction of tooth Metoda obliczeniowa tribotechnicznych charakterystyk przekładni zębatych Metal-poliMerowych z poliaMidu wzMocnionego włókneM szklanyM z uwzględnienieM korekcji zębówThe paper proposes a new method for calculating the service life, wear and contact pressures of metal-polymer gear drives with a correction profile. The effects of height and angular modification in a gear drive made of dispersive glass fibre-reinforced polyamide and steel on its contact and tribocontact parameters are determined. A numerical solution obtained for the gear with height correction has shown that the life of such gear is the longest when the profile correction coefficients 1 2x x =− = 0.1. It has been found that the service life of the gear with angular correction is shorter than that of the gear with correction height. The effects of gear tooth height and angular correction on maximum contact pressures and pinion wear are examined and determined.