Internal combustion engines are equipped with turbochargers to increase their power, while the design of the engine itself practically remains unchanged. The turbocharger operates at high rotor speeds (25000 ...110000 min -1 ), as well as at high temperature conditions (650...700 ºC). The problem is compound by the fact that the bearing assembly receives a lubricant that was involved in lubrication of the rubbing elements of the entire engine, since the turbocharger bearing lubrication system is combined with the engine lubrication system. This leads to increased wear on the turbocharger bearing and a reduction in its service life. These circumstances require an increase in the lubrication efficiency of the turbocharger-bearing unit. To solve this problem, we have developed a new design of an individual lubrication system for the internal combustion engine turbocharger bearing. The design solution allows to provide the turbocharger bearing assembly with lubricant in the engine start mode and after it stops during the rotation of the rotor by inertia for 90 seconds. The article deals with the design calculation of the individual turbocharger bearing lubrication system. In order to be able to calculate the design of an individual turbocharger bearing lubrication system for any engine, a mathematical model has been developed. The final formulas for calculating the parameters of the turbocharger bearing lubrication system are present, as well as specific calculation results for the most common brand of turbocharger.

As a result of the analysis of statistics on the main failures of the turbocharger of tractor engines in agricultural production, it can be concluded that it is the condition of its bearing node, in the first place, determines the performance of the entire turbocharger. This ultimately affects the duration of the turbocharger rotor after the engine stops. The article considers the method of determining the rotation time of the turbocharger rotor by inertia depending on the following factors: the time of the pressure drop in the turbocharger grease system, the gap in the turbocharger bearing node, the frequency of rotation of the rotor before the engine stops. The results of experimental studies on the timing of the turbocharger rotor rotation after the engine stop for the regular mode of greasing the bearing node and when using an individual lubricant system are presented. Based on the experimental values obtained, it is concluded that the main indicator of the performance of the turbocharger is the duration of rotation of its rotor after the engine stops and the application of the individual system of lubrication of the bearing node of the turbocharger reduces the cost of bearing resource and increases the resource of the entire turbocharger of agricultural machinery engines at least twice.