Assessment of operability of maintainable crosspiece

Abstract

Ensuring operability of transport technological machines is connected with increase in characteristics of non-failure operation, durability and maintainability of transmission units, in particular, of drive lines. The analysis of trends of improvement of designs and technological processes of maintenance operation of drive lines shows that designs of joints with maintainable crosspieces and bearing mount assemblies are perspective. Besides, developments of technical solutions on realization of automated maintenance operation of bearing mount assemblies on the basis of control of their valid technical condition are perspective. Results of comparative assessment of operability of maintainable and serial crosspieces of asynchronous cardan joints on the example of the IV standard size on RD 37.001.665-96 are presented in the article. In the course of probes graphic 3D-models of serial and maintainable crosspieces in the computer-aided engineering system of KOMPAS-3D CAD-technologies are made. In connection with complexity of design for the purpose of increase in reliability of estimation of the crosspieces strength and stiffness, test calculations are performed on the basis of the CAE-technology by means of applied library of the final and element analysis of automated workplace of FEM for KOMPAS-3D. When evaluating the intense deformed condition of serial and maintainable crosspieces, comparative calculations of parameters at the modes of nominal operational loading are performed. The final results were estimated in sizes of equivalent normal tension, total deformations and the safety factor on fatigue strength at bend. In calculation result conclusions about the working capacity and prospects of the offered design and mode of maintenance operation of cardan joints are confirmed.

Adaptivity of thermal diagnostics method of mechanical transmission assemblies

“…The value of the diagnostic temperature of the subject of diagnostics taking into account the above facts is determined by the following polynomial [9].…”

“…The development of an analytical mathematical model of temperature in the friction zone Θ F , ºC, in relation to the joints of the drive lines is devoted to research [10], and the mathematical model obtained by us earlier takes into account the previously mentioned factors with the exception of the radial play in the CBA (2).…”

Analysis of Bearing Assemblies Refit in Agricultural PTO Shafts

“…According to [11], tests on agricultural machinery have shown that 14% of mechanical transmission failures are due to universal joints, with about 60% of failures due to cardan joints. According to research [12], the service life of an agricultural cardan shaft is between 5 and 9 years, which is very low considering that it is used only a few days a year. This low service life is influenced by the type of maintenance and use, as well as the conditions of use (terrain, angle of rotation α, etc.)…”

“…); insufficient use (cardan shaft).) [12]; improper use (often too long or too short cardan shafts, poorly fixed shafts, too large rotation angles of the joints, application of higher torques than the shaft can withstand [23], etc. ); complex atmospheric conditions [24] (working in rain, wind, dust, etc.…”

Development of Diagnostic Technology in a Reliability-Oriented Maintenance System

“…Результаты теоретических исследований были верифицированы, а технология апробирована в условиях стендовых и эксплуатационных испытаний [18][19][20]. Реализация технологии термодиагностики определяется внедрением эффективных методов и средств.…”