Experimental Testing of the Quality of elasTomeric Seals of the O-ring Type of Modernauto-Tractor Internal Combustion Engines

Le résumé fourni par la source

The purpose of the work is to study the manufacturing quality and stress relaxation during compression and determine the residual deformation of elastomeric sealing rings of the O-ring type, which are used in the technical service of modern agricultural machinery. Experimental studies were carried out on a DM-30M laboratory unit. During the test, the dependence of the stress drop in compressed samples of materials on time, the rate of stress relaxation, the magnitude of the stress drop to the equilibrium value, the equilibrium modulus, and the residual deformation after the removal of the load were determined. An approximation of the dependences of changes in experimental data was carried out. O-rings, used for sealing the coupling of the wet sleeve and the landing belt of the cylinder block in modern internal combustion engines, were tested. The rings of the original production and the substitute (analogue) were tested. Tests showed that although the rings of both manufacturers have visible defects on their surfaces, formed during production, however, the analog rings have a greater number of defects of various types than the rings of the original. The curve of the decrease in compressive strength of analog ring samples shows a more rapid decrease in compressive strength during exposure for 24 hours than such a dependence determined for the original rings. It was also recorded that, with relatively identical ring sizes, the weight of the analog ring is 22% greater than the original ring. This may indicate that the ring materials are different. It was noted that when the studied rings are kept in engine oil for 168 hours and their subsequent compression, the stress relaxation parameters in the analog ring material are characterized by greater instability. This indicates that there is a high probability that by installing non-original rings during engine repair, the coupling may lose tightness over time. Especially with damaged ring seats.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.