活塞裙外形结构对活塞的工作性能有很大影响，针对这一问题，国内已研究设计了变椭园、中凸桶形的裙部活塞。以此为例，在改进190型柴油机中对活塞裙部的纵向和径向线型设计作了探讨，经试验认为，如采用纵向为两段抛物线，径向为修正椭园线型而形成变椭园一中凸桶型的裙部活塞时，能避免活塞的棱缘负荷，有效地改善活塞的工作性能。 Piston skirt shape and structure of the piston performance has a significant impact, in response to this problem, the country has studied the design of variable elliptical, convex barrel skirt piston. Taking this as an example, the longitudinal and radial linear design of the piston skirt is discussed in the modified 190 diesel engine. According to the test, if the longitudinal section is a two-stage parabola and the radial section is a modified ellipse, Elliptic a convex barrel-type skirt piston, the piston can avoid the edge of the load, effectively improve the performance of the piston.