Some results of experimental modeling cylinder and piston group oil supplay conditions of the low-sized four-cycle diesel engine

Experimental results on direct visualization of cylinder and piston group (CPG) interacting surfaces oil supply in a high-speed four-cycle engine are presented and discussed in the article. The relevance of this work is connected with an insufficient examination of lubrication processes, in particular, deficiency of experimental data concerning to four-cycle engine with traditional crank-and-rod mechanism (CRM) CPG oil supply. The purpose of the research was experimental supervision of processes of oil delivery to interacting surfaces of coupling «cylinder-piston» in a four-cycle internal combustion engine. Attainment of the assigned purpose has been carried out by means of experimental modeling lubricating system operation with the special breadboard setup supplied an independent drive of the oil pump and optical transparent cylinder and piston. The received results have allowed to specify the CPG oil supply behavior, and also to identify the new function of the piston consisting in transfer of disintegrating oil stream onto the interacting surfaces of the piston and cylinder. During experiments earlier stated hypothesis about existence of anomaly of quantity of the lubricant arriving on the thrust and anti-thrust side of the cylinder has been confirmed. The presented experimental information can be used for operational development and modernization of any combined type lubricating systems serving four-cycle piston engine with traditional CRM.