• Title, Summary, Keyword: 링팩

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Development of Piston Ring Lubrication for the Ring Pack Arrangement (링팩내의 피스톤링 윤활에 관한 연구)

  • 심현해;권오관
    • Tribology and Lubricants
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    • v.1 no.1
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    • pp.46-58
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    • 1985
  • The basic mechanism of lubrication between the piston ring and the cylinder wall is developed theoretically under the assumption of a reciprocating and dynamically loaded slider-bearing pair of parabolic form and smooth plane. A numerical computation for the prediction in cyclic variations of film thickness, net lubricant flow and frictional behaviour is attempted, and the influenec on the performance characteristics due to the ring height, ring face radius of curvature and the degree of offset, is also examined. The computational procedures develeped for a single ring system are extended and applied further to the complex problem of a ring pack system. It is well known that the ring pressure which is the total load on a ring, can be obtained from either an experimental measurement or a gas flow analysis. In this work, the latter of a gas low analysis method was used to calculate the pressures. It is remarked that the work done was focused on the role of flow continuity and lubricant starvation within the ring pack lubrication.

Analysis of Frictional Performances In Ring Pack By Commercial Package (상용 소프트웨어를 이용한 피스톤 링팩의 윤활 성능 해석)

  • 최원석;차상량;이희락;장시열
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.219-226
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    • 2000
  • Frictional performance of ring pack in internal engine is investigated by varying spatial dimensions of ring pack and operating speed. This investigation is performed with commercial software by Ricardo Consultant Engineers, Inc. which is now in wofdwide use in automobile industries. Among the ring performances, blow-by rate, axial ring motions and frictional behaviors of top and second rings are studies in our work.

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Friction Characteristics of Piston Assembly (II) -Experiment- (피스톤계 마찰 특성 (II) -실험적 연구-)

  • Cho, Myung-Rae;Ha, Kyoung-Pyo;Kim, Joong-Soo;Oh, Dae-Yoon;Han, Dong-Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.1
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    • pp.88-93
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    • 2003
  • The aim of this paper is to investigate the friction characteristics of piston assembly, which composed of ring pack and piston skirt. The friction force of piston assembly was measured by using the movable liner in the single cylinder engine, and the various parameters were tested. The friction force was suddenly increased at the expansion stroke due to higher cylinder pressure. The viscous friction was dominant at the mid stroke, but the boundary friction was dominant at the top and bottom dead centers. Through the experiment, we could validate previous theoretical study, and confirm that th e radial clearance and ring tension were very effective to reduce friction loss of piston assembly.