Abstract
The research of influence of sliding friction coefficient on durability is carried out for gear train containing steel wheels and metal-polymer gear trains containing polyamide gears reinforced with carbon and glass dispersion fibers. The teeth engagement conditions (two teeth pairs - single tooth pair - two teeth pairs) and the change of teeth tribocontact interaction conditions due to wear are also taken into account. The gear train containing the carbon-filled composite gear has the highest durability in comparison with other types in all ranges of change of sliding friction coefficient. The highest maximum contact pressures will be at the point of entry into the one-pair engagement. The change of initial maximum contact pressures in gear train due to tooth wear was also investigated and its regularities were established. The kinetics of the tooth profile wear was studied. It is established that the maximum wear will be at the point of entry into the one-pair engagement. Close to it will be the wear at the entrance into the two-pair engagement. The course of wear at different points of engagement for the studied gear trains containing steel toothed wheels and gear trains containing steel and composite gears is almost the same except for the point of the teeth exit from the engagement.
Highlights
In order to effectively reduce the friction coefficient in tribomechanical systems of various kinds, lubricants are widely used, including the use of antifriction and antiwear additives, resulting in reduced wear and increased durability
In the literature of the subject there are no studies of the friction coefficient influence on the change of durability of gears made of metal (ММ) and nonmetallic materials using known computational methods [1,2,3,4,5,6,7,8,9,10]
Materials of metalpolymer gears: - composite 1: polyamide reinforced with 30% dispersive carbon fibers - PA6+30CF, τSCF= 48 МPa, ЕCF = 5200 MPа, νCF = 0.42, СCF = 4.7·106, m F = 2.3 [12,13]; - composite 2: polyamide reinforced with 30% dispersive glass fibers - PA6+30GF, τSCF = 52 МPa, ЕGF = 3900 MPа, νGF = 0.42, СGF = 1.2·106, mGF = 1.9 [12,13]
Summary
In order to effectively reduce the friction coefficient in tribomechanical systems of various kinds, lubricants are widely used, including the use of antifriction and antiwear additives, resulting in reduced wear and increased durability. According to the author's calculation method in [11] the influence of the coefficient of sliding friction on the durability of spur MM gears of an electric locomotive under changing contact conditions in the corrected gearing due to teeth wear was inves-
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