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,5 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 at the 101.8 mm section of the third cylinder,the maximum radial deformation of the ellipse scheme is reduced by 15.42%compared with the original cylinder liner.The blow-by quantity of the elliptical cylinder liner is decreased by 1.34%compared to the original engine cylinder liner,while the blow-by quantity of other schemes is greater than that of the original engine cylinder liner.Compared to the original engine cylinder liner,the oil consumption of the spindle-shaped cylinder liner and the elliptical spindle compound-shaped cylinder liner is decreased by 21.36%.
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