Some rheological properties of new and used mineral lubricant and biolubricant for tractors
¹Slovak University of Agriculture in Nitra, Faculty of Engineering, Department of Physics, Trieda Andreja Hlinku 2, SK949 01 Nitra, Slovakia
²Slovak University of Agriculture in Nitra, Faculty of Engineering, Department of Transport and Handling, Trieda Andreja Hlinku 2, SK949 01 Nitra, Slovakia
It is important to know physical characteristics of lubricating oils to ensure the highest reliability for operation of device. The use of ecological lubricants depends on their characteristics; the most important are density and viscosity, protection against wear and tear, corrosion resistance etc. The objective of this work was to find changes of the rheological properties of the synthetic oil and bio lubricant. We compared two different oils in our measurements. One sample was synthetic oil and the other was mineral oil (bio lubricant). Both oils are universal oils for tractors. Further, comparison of new and used sample after million cycles was performed. The density and the dynamic viscosity show strong exponentially decreasing dependence. With the increasing temperature, values of the both properties, decreased. It can be also observed that used samples have lower viscosity and density. The results presented in this article can be important when putting ecological lubricants into operation.