| Abstract:Taking a non-road high-pressure common rail diesel engine as the research object, a bolt-cylinder head-cylinder gasket-cylinder liner-block assembly coupling model was established. The thermal-mechanical coupling out-of-round deformation of cylinder liner under working conditions was studied by combining simulation analysis and test. Based on the deformation results of the cylinder liner, five kinds of special-shaped cylinder liner pre-compensation schemes (conical, bottleneck, spindle, elliptical, elliptical spindle composite) with different profile characteristics were designed. The thermo-mechanical coupling deformation, Fourier deformation amplitude, sealing and friction performance of different special-shaped cylinder liners were studied. The results show that when the third cylinder is in an explosive state, the deformation of the scheme five-ellipse spindle composite at the top of the flywheel side is reduced by 52.61 μm compared with the original machine. At the 101.8 mm section of the third cylinder, the maximum radial deformation of the scheme four-ellipse is reduced by 15.42 % compared with the original cylinder liner. In a working cycle, compared with the original machine, the average channeling volume of the scheme 4-ellipse is reduced by 9.5 %, and the maximum oil consumption of the scheme 4-ellipse and the scheme 5-ellipse spindle composite is 44 % and 44.28 %, respectively, compared with the original machine. |