Analysis on cracks of press-fit cylinder blocks in high-pressure piston pumps

  • Liqiang XuEmail author
  • Hongfei Sun
Technical Paper


High pressurisation is one of the important developmental techniques for piston pumps. Given that press-fit cylinder blocks of instruction machinery develop cracks or breakage; based on the DIN 7190(2001) and GB/T 5371-2004, the amounts of interference in the press-fit cylinder block were calculated. The maximum, minimum, and average amounts of interference were 0.1689, 0.0576, and 0.1133 mm, respectively. Finite-element analysis of interference force as a single applied force and interference force in conjunction with hydraulic pressure was investigated in this study as multiple applied forces in order to investigate the causes of cracks. The results indicate that at the maximum interference, the weak section where cracks easily develop is the thin wall between the cylinder bore and the spring hole. The analysis results are consistent with the observed positions of the cracks, thereby providing a reference for the future design and production of piston pumps.


Piston pump Cylinder block Cracks Interference fit Finite element analysis 



This work was supported by the Key Research and Development Program of Yantai (Grant No. 2018XSCC037), Natural Science Foundation of Shandong Province (Grant No. ZR2019MEE074), and Yantai Eddie Hydraulic Technology Co., Ltd.


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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringShandong University of Science and TechnologyQingdaoChina
  2. 2.School of Mechatronic and Automobile EngineeringYantai UniversityYantaiChina

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