Method for designing spatial curved surface of piston skirt

The invention discloses a method for designing a spatial curved surface of a piston skirt, and the method comprises the following steps: 1, carrying out deformation simulation calculation on a piston through finite element analysis (FEA) so as to obtain the deflection of the piston; 2, calculating a lateral molded line of the piston by using the short-shaft deflection result of the piston; 3, calculating a longitudinal molded line of the piston by using the long-shaft deflection result of the piston; and 4, calculating the diameter-reduced quantity of any point of the piston so as to obtain the barrel-shaped surface result of the piston. By using the method disclosed by the invention, the design reliability can be improved, so that the spatial curved surface of the piston skirt is more identical with an actual curved surface.