EFFECT OF LUBRICANTS ON FATIGUE WEAR AND QUALITY OF GEARS FRICTION SURFACES
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 81, Issue
Abstract
The results of the study of the lubricants influence on the fatigue removal of friction pairs with local contact under rolling conditions with sliding are presented. Of the five tested oils, only the VNII NP 50-1-4u oil passed the tests for fatigue wear – 4,8·105 cycles (20 hours). But even on this oil, after 20 hours of testing a single chipping ulcer was found on the friction sur-face. The connection between the lubricating layer thickness and the time to occurrence of the chipping on the gear wheels friction surfaces is shown. The larger lubricating layer thickness corresponds to a greater number of cycles to the chipping for all the oils, except for the syn-thetic VNIII NP 50-1-4u. The volumetric temperature of the oils during the test varied insignif-icantly from the output to 45 ° C (at the VNII NP 50-1-4u) to 55 °C (in MS-20). It has been established that the use of synthetic oils VNII NP 50-1-4u and IPN-10 as a lubricant medium in tribo compounds allows to increase the pitting resistance of friction surfaces of gears in 3,5 ... 4 times compared with the use of mineral oils. This is achieved due to the formation in the triboelements surface layers of self-generating organic film (SOP), which has high anti-wear properties. In connection with the fact that the formation of chemisorption films, which exhib-it increased resistance to excitation, is not related to the hydrodynamic effect, the study of non-hydrodynamic lubrication and its influence on the fatigue wear of contact surfaces is grounded. The use of counterweight and anti-dusting properties of SOPs is the most promising and most economical way for further improvement of wear resistance and durability of tooth gearings, roller bearings and other parts, which does not require complication of production technology and enhancement of the quality of structural materials.
Authors and Affiliations
V. B. MELNYK, O. V. RADKO, A. K. SKURATOVSKY, I. A. KASHIRSKA, T. S. TKACHENKO
Keywords
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