Four-valve Diesel Engine Cylinder Head Inlet Consistency Of Performance Research

Guangxi Yuchai Machinery Co., Ltd. covers a newly developed three-cylinder four-valve four-valve diesel engine G2000with energy saving, environmental protection, high efficiency, low emissions and other advantages, the burning tissue to facilitate the emission of high agreement, prospects more promising.However, R&D at the beginning, a random sample of46product qualification rate than all the inlet swirl is zero, for this problem was this performance of diesel engine cylinder head inlet consistency of bias research. The first round of shrinkage and process design from the discrepancies and the height difference between the unstable fix points as research starting point, by adjusting the processing of locating pin hole length and width direction to adjust the shrinkage in a disguised form, to solve the problem of casting shrinkage. The second round of the deformation from the deformation point of view to explore the impact of consistency on the law of the airway, to take anti-deformation of the valve center of a long program of reducing the absolute value of the bias and improve the valve center to the deviation of the consistency of long. Airway length from the third round of the width and height dimensions there is a deviation from the time of the impact of swirl ratio, combined with anti-distortion optimization airway variety of data, re-design inlet. The fourth round of validation with different airway, different sets of core water and locating pin hole offset the results of interaction to address the adjustment of the cylinder head water jacket core holes after the pins consistency of swirl ratio.After four rounds of field research investigation, inspection and marking, the use of line charts, scatter diagrams, and normal distribution analysis of the data analysis on a variety of programs, Optimization parameters strict control of the time trial on airway shape, anti-deformation process of influencing factors, strict when the inlet control cell damage repair, when the graphite paste thickness of the bushing, when the core group submit a check with the height of the inlet boss, after blowing a clean under the core cavity of the floating sand core issues such details. Airway consistency of performance has been greatly improved, G2000cylinder head swirl ratio increased to70.1%passing rate, with which the cylinder head with the E2100series swirl ratio80.4%pass rate, up to85%-90%, new product development for the company reduce costs, improve performance reliability and competitiveness.