CRANKSHAFT JOURNALS BEARINGS BEHAVIOR UNDER DILATION AND STRAIN EFFECTS

The heating and mechanics effects due to the temperatures and pressures in bearings were largely studied these last years but separately; few studies are devoted to the two phenomena acting together in dynamic mode, such as the crankshaft and rod bearings; where the requirements are very severe. In order to approach reality and confronting with other studies being interested in the thermo-elastohydrodynamic phenomena (TEHD). The studied model takes into account the deformations due to the pressures field for the bearing as well as the dilation effect and the reduction of the lubricant viscosity, due to the heat transfer effect, between oil and bearing. Simulation results of the crankshaft bearings of in internal combustion engine are presented and show that the thermal distortion has remarkable effects on the bearings performances.Original Abstract: Pastaruoju metu placiai, bet atskirai vienas nuo kito buvo nagrinejami temperaturos ir slegio sukelti silumos ir mechaniniai efektai. Tik keletas darbu buvo skirta abiem reiskiniams, kartu vykstantiems alkuniniame velene ir padevetuose guoliuose, kuriems keliami labai griezti reikalavimai. Siekiant priarteti prie tikroves ir sugretinti su kitais darbais, buvo susidometa tampriu termodinaminiu reiskiniu. Tiriamasis modelis ivertina deformacijas, atsirandancias del guolio itempiu, taip pat issipletima bei klampos sumazejima del silumos mainu tarp tepalo ir guolio. Vidaus degimo variklio alkuninio veleno guoliu modeliavimo rezultatai rodo, kad siluminiai poveikiai turi didele itaka guoliu darbui.