Effect of unloader valve spring tension on hydraulic performance of CRI1 electromagnetic injector

Abstract

The report reflects the results of an experimental study of the influence of the tension of the unloading valve spring on the hydraulic characteristics of electromagnetic nozzles. The research was done on a CMX6000X universal diesel fuel system test bench. An electromagnetic nozzle of the first-generation Common Rail - BOSCH CRI1 was chosen as the object of the study. It was found that with an increase in the tension of the spring of the unloading valve in all test modes, a decrease in the amount of fuel per cycle was observed. The rate of change of the amount of fuel per cycle for the individual test modes is different in the individual parts of the size range of the adjusting shim. The optimal thickness of the adjusting shim for the spring tension of the unloading valve for the tested nozzle is from 1.60 mm to 1.70 mm.