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Liu S.,Shandong University of Technology | Liu S.,Shandong Binzhou Bohai Piston Co. | Tian X.,Shandong Binzhou Polytechnic College | Pan F.,Shandong University of Technology
Qiche Gongcheng/Automotive Engineering | Year: 2014

In view of that with the continuous rise in engine explosion pressure, the fatigue cracking failure of piston pin boss frequently occurs, 'load', 'stepping load' and 'stepping pressure' three schemes of acceleration fatigue tests are conducted on the piston pin boss of a engine with a hydro-mechanical fatigue testing system. The results provide a basis for the research on the mechanical fatigue mechanism of piston. In addition, by setting up the fatigue life formulae of piston-pin boss and evaluating crack expansion rate of alusil alloy, the service life of piston can be effectively predicted.

Tao L.-L.,Shandong University | Liu S.-Y.,Shandong University of Technology | Tian X.-Q.,Shandong Binzhou Polytechnic College | Du G.-S.,Shandong University
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2013

Nowadays in passenger car, the gasoline engine Al-Si alloy piston skirt carrying capacity has almost reached its material extreme, so the skirt structure should be designed reasonably to get the expectant engine performance i.e. comfortable, economical, reliability and safety. Skirt stiffness matrix evaluation criterion was set up, combined with FEA analysis method and stiffness measurement test to realize effectively the lightweight skirt design. It is concluded that larger piston safety margin can be achieved by modifying reasonably skirt lower-end stiffness. Lower skirt stiffness may quite reduce skirt contact force, but piston tilting angle and kinetic energy increase by different degrees. Optimization of the piston skirt stiffness should be considered based on trade-off of engine performance requirements.

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