Analysis and optimisation of impact wear of diesel engine needle valve assembly
by Lei Gang; Guanghua Huang; Haijun Yuan; Songlin Xia; Wei Tan
International Journal of Hydromechatronics (IJHM), Vol. 5, No. 1, 2022

Abstract: Impact wear is one of the main factors of needle valve coupling failure. The dynamic analysis of multiple impacts of needle valve coupling is carried out to obtain the maximum contact stress when the collision is stable, and the wear analysis is carried out based on this stress. The orthogonal experimental design was used to optimise the parameters of needle valve pairs. The results show that the main factor affecting the maximum contact stress is the cone angle of needle valve body, followed by the fillet of needle valve sealing seat surface, and the cone angle difference between needle valve and needle valve body has the least influence. Compared with the original scheme, the maximum contact stress is reduced by 20.7% and the service life is obviously improved.

Online publication date: Mon, 25-Apr-2022

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