Investigation of the effect of height correction of metal-polymer helical gears teeth on contact pressures, wear and durability

ABSTRACT

A study of the effect of height correction of the engagement of helical gears on contact pressures, tooth wear and durability using the author's method of calculating metal-polymer gears was conducted. Carbon steel 0.45%C was chosen for the pinion, and polyamides PA6 or PA6 + 30% CF were chosen for the gear. At different helix angles and shift coefficients the estimation of maximum contact pressures in engagement is carried out. Quantitative and qualitative regularities of influence of both factors on contact pressures considering conditions of teeth engagement are established. The teeth linear wear is differentiated during the engagement cycle depending on parameters of correction and helix angle. Its values have been established at the characteristic engagement points: at the entrance; at the entrance to the central phase and at the exit from it; at the exit from the engagement. The durability is significantly affected by both the correction of engagement and the helix angle. Quantitative and qualitative regularities of this influence are established. The presence of the optimum shift coefficients at which the gears durability will be the highest has been established. MP gears with a gear made of PA6 + 30CF will have significantly higher durability than PA6.     

KEYWORDS:

• Dry friction
• metal - polymer helical gears
• two - one - two - pair or three - two - three - pair engagement
• polyamide PA6 and carbon composite PA6 + 30CF
• maximum contact pressures in engagement
• gear teeth linear wear
• gears durability

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available from the corresponding author, Myron Chernets, upon reasonable request.

Additional information

Notes on contributors

Myron Chernets

Myron Chernets Professor of Ukraine, Professor of the Republic of Poland, Doctor of Technical Sciences, Doctor habilitated. He is currently a professor at the National Aviation University (Ukraine).

Areas of research are: tribology, tribomechanics, tribotechnics, tribomaterials, biotribology, contact mechanics.

1. Phenomenological methodology for studying the kinetics of wear of materials during sliding friction.

2. Methods of model triboexperimental studies of wear of different types of structural materials and coatings.

3. Generalized methods for calculating the contact strength of cylindrical joints with small non-roundness of the contours of their elements.

4. Generalized methodology for assessing the contact strength, wear and durability of sliding friction units of different types.

5. Engineering methods for calculating these performance characteristics of different types of sliding friction units, in particular: - plain bearings of various sizes, including metal-polymer and polymer; -tooth gears of different types (cylindrical, bevel, worm), including metal-polymer and polymer.

6. Methods of estimated assessment of contact pressures, wear and duration of use of different types of human joint endoprostheses.

7. Methods of calculation of contact pressures, wear and service life of ball joints of technical application.

Author of more than 410 different types of works: monographs, articles, conference reports, patents for inventions, textbooks, manuals. In particular, 37 monographs and 14 textbooks and manuals.

Anatolii Kornienko

Anatolii Kornienko PhD Associate Professor, Senior Researcher, Laureate of the President of Ukraine Prize for Young Scientists. In 2002 he graduated with honours from Sumy State University. Associate Professor of the Department of Applied Mechanics and Materials Engineering of the National Aviation University. Research is related to improving the wear resistance of structural materials through coatings and calculation methods to assess the wear and durability of metal-polymer plain bearings and gears. Author of about 100 publications, including 2 monographs, 6 textbooks and 12 patents.

Yuriy Chernets

Yuri Chernets Master’s degree in ‘Software Engineering’. Yuri Chernets graduated from the Technical University of Lublin (Poland) in 2009.

Research topics:

1. Investigation of contact strength, wear and durability of plain bearings of different sizes (micro, miniature, small, medium, large, ultra-large diameters) - metal and metal-polymer.

2. Investigation of contact strength, wear and durability of gears of different types (spur, bevel, worm) - metal, metal-polymer and polymer.

3. Methods of research of contact pressures, wear and duration of use of endoprostheses of human joints

Author of 70 scientific papers: monographs, articles, conference reports, patents for inventions, including sections in 6 monographs.