• Title/Summary/Keyword: lubriction analysis

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A Lubrication Analysis between the Piston and Cylinder in Hydraulic Piston Pumps Part 1: The effect of piston shape (유압 피스톤 펌프의 피스톤과 실린더 사이의 윤활해석 (제1보:피스톤 형상에 의한 영향))

  • 박태조;전병수
    • Tribology and Lubricants
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    • v.14 no.1
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    • pp.64-69
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    • 1998
  • A numerical analysis is carried out to study the effect of piston shape on the lubrication characteristics between the cylinder and piston in hydraulic piston pumps. The results showed that the shape of piston affect significantly the pressure distribution in the clearance, the lateral force acting on the piston and leakage flow through the clearance. Partially tapered piston is more effective than any other piston shapes because it reduces the possibility of hydraulic locking and improves the volumetric efficiency of the pump.

Analysis for Lubrication of the Piston Ring Considering Oil Transport-Examples (오일이송을 고려한 피스톤 링의 윤활 해석-예제)

  • 이재선;한동철
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1998.10a
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    • pp.358-364
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    • 1998
  • Lubricational characteristics at the interface between the piston ring and the cylinder liner are considered in this paper. To verify that surface shape and operating conditions of the engine can affect the state of lubrication, the changes of the minimum film thickness and friction force are calculated with various conditions. Oil starvation and open-end boundary condition are used to determine computational boundaries as reported on previous paper for lubrication analysis for the piston ring. From this analysis, it can be found that lubricational characteristics are seriously affected by degree of oil starvation, surface shape and operating conditions.

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