The article presents regularities that complex the thickness of the lubricating film, circumferential speed, quasi-static contact stresses and vibration accelerations generated by the gear transmission during its operation. Their analysis shows that in the gear transmission, a complex combination of the circumferential speed and the value of the quasi-static contact stresses and the vibrations generated by the transmission itself has a significant effect on the thickness of the lubricant film, which together in many respects determines the damaging factors. With this in mind, gear transmissions can be conditionally divided into groups: light-loaded and heavy-loaded, in which an increase in the circumferential speed leads to power changes in the thickness of the lubricating film and the generated vibration accelerations, and the gear transmissions located between them, in which an increase in the circumferential speed practically does not affect the thickness of the lubricating film and the effect of its change on the resource can be neglected. The necessity of accounting the tribotechnical, loading, high-speed factors and characteristics, arising in this case damage of local zones of working surfaces of teeth in estimating the gear transmission is shown. The obtained quantitative results of the research can be attributed only to the spur gear transmission used in the tests, during its operation with contact stresses 200...1150 MPa, circumferential speeds 3...12 m/s and lubrication by irrigation with oil «Industrial-20» having a temperature (20 ± 5) °C. However, these results can be used in the development of methods for refined prediction of tribal resource of tribocouplings taking into account high-speed and load modes of their functioning, as well as generated vibration accelerations in real operating conditions. Moreover, the established patterns may be somewhat characteristic of lubricated toothed gears as a whole. Their accounting when designing a lubricated toothed gear, used in a wide range of speed modes of operation, allows you to select geometric parameters of gearing, at which the range of contact stresses will allow to minimize the influence of speed and load factors on the thickness of the lubricant film and the associated transmission resource.
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