In order to improve performance, various elliptical pistons have been widely used in engines. These pistons not only change the ellipticity in each section of the skirt, but also the skirt busbars are mostly curved. At present, there are two main methods for adding such pistons. One is to directly process the variable elliptical piston with a special machine tool, and the other is to use the imitation shape processing. The latter method has high productivity and simple operation, and is especially suitable for large
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