Decreasing the wear of precision pairs of fuel injection equipment in diesel engines

Abstract

Reliable operation of a diesel engine largely depends on wearing degree of joints and assemblies of fuel injection equipment. The precision components of the high-pressure fuel pump and nozzles are most susceptible to wear. The following methods are used to reduce the wear of precision pairs of a high-pressure fuel pump: increasing the hardness of the mating parts, improving the filtering quality of the fuel and increasing the fuel lubricity. From the point of implementing easiness and obtaining the greatest effect, the most promising is improving the lubricity of motor fuel. It is possible to increase the lubricity of motor fuels by using liquid fuels of biological origin or by introducing vegetable-based fluid into commercial mineral diesel fuel, for example, cameline oil. The fuel kinematic viscosity effect on the wear of the precision pairs of the fuel injection equipment in diesel engines is theoretically substantiated. The results of bench tests of a high-pressure fuel pump for wear of plunger pairs (inner cylinder - bush bearing) during operation with mixed cameline-mineral fuel are presented.