分会场

第十届内燃机可靠性技术国际研讨会

摘要

Piston secondary motion does not only influence the side knocking of piston and frictional loss, but also influence the in-cylinder oil con-sumption and gas blow-by. An inline four-cylinder common rail diesel engine was chosen as the research object. Dynamic simulation mod-el of piston assembly was built based on the piston and cylinder liner temperature field test. The impacts of pinhole offset, liner clearance, piston skirt ovality on piston secondary motion were researched. Based on the surface response method, the influence of multiple factors on friction power loss and slapping energy is analyzed. The results indicates that: in-cylinder stress condition of piston will change with its structural parameters, then the secondary motion of piston will be affected as a result. Pinhole offset, liner clearance, piston skirt ovality and the interaction of the latter two all have significant effects on the friction power loss, while the slapping energy is significantly affected by liner clearance. Therefore, the parameters can be designed based on the significance level to optimize the secondary motion characteristics of the piston.

关键词

diesel engine；piston；structural parameter；piston secondary motion；response surface methodology

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