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在闭式喷油咀(图1)中,每当燃油喷射时针阀升起到一定的高度值C,则针阀与针阀体锥面配合处打开一个环形间隙以通过燃油。 《星》柴油机制造厂生产的柴油机,其针阀的升程值C有极严格的公差,C=0.48~(+0.05)毫米。 以升程值C保证针阀与针阀体的互换性,在生产上有一定的困难,所以目前在一些工厂里仍然采用研磨,不完全互换(选对装配)和配对磨削的方法。 通常,尺寸C的精度是在针阀对针阀体的研磨时,由磨削针阀锥面K_и的余量来保证。余
In a closed nozzle (Figure 1), the needle valve is raised to a certain height value C every time the fuel injection occurs. The needle valve and the conical surface of the needle valve body open an annular gap to pass the fuel. Diesel engine manufactured by “Star” Diesel Engine Factory has a very strict tolerance on the lift value C of needle valve, C = 0.48 ~ (+0.05) mm. To lift the value of C to ensure that the needle valve and valve body interchangeability, in the production of some difficulties, so in some factories are still used in the grinding, incomplete exchange (selected assembly) and the method of mating grinding . Normally, the accuracy of the dimension C is ensured by the margin of the taper K_и of the grinding needle while the needle valve is grinding the needle body. I