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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 62 for “"piston ring"”.
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Piston ring friction
… of Technology, Dept. of Mechanical Engineering, 1982.
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Factors affecting piston ring friction
The piston ring pack friction is a major contributor to the internal combustion engine mechanical friction loss. The oil control ring decides the oil supply to the top two rings in addition to being the major friction contributor in the ring pack. This work concentrated on the oil control ring …
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Oil Transport in Piston Ring Assemblies
The interface between the piston, piston-rings and the cylinder liner represents one of the most hostile environments the crankcase lubricant experiences in reciprocating engines. The role of piston rings is also becoming more complex in line with the increasing requirements for lower oil …
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An experimental and theoretical study of piston ring lubrication
… with developing a greater understanding of piston ring lubrication and consists of both experimental and theoretical components. It begins with a review of piston ring and ring pack lubrication studies, describing how the understanding of the operation of piston rings has progressed since …
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Piston ring friction analysis from oil film thickness measurements
… of Technology, Dept. of Mechanical Engineering, 1994.
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Piston ring design for reduced friction in modern internal combustion engines
Piston ring friction losses account for approximately 20% of the total mechanical losses in modern internal combustion engines. A reduction in piston ring friction would therefore result in higher efficiency, lower fuel consumption and reduced emissions. The goal of this study was to develop …
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Modeling the performance of the piston ring-pack in internal combustion engines
… of Technology, Dept. of Mechanical Engineering, 1997.
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Curved beam based model for piston-ring designs in internal combustion engines
Characterizing the piston ring behavior is inherently associated with the oil consumption, friction, wear and blow-by in internal combustion engines. This behavior varies along the ring's circumference and determining these variations is of utmost importance for developing ring-packs achieving …
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Effect of ring tension, face width, and number of rings on piston ring friction
… Dept. of Naval Architecture and Marine Engineering, 1951.
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Air flow effects in the piston ring pack and their implications on oil transport
3 different flow regimes of piston blowby air and their influences on oil transport are studied. It is found that air mainly interacts with oil close to the ring gaps and directly below the ring-liner contacts. Geometric features at the gaps to smoothen airflow and prevent flow detachments can …
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Intricate dynamics and hydrodynamic frictional losses of the piston-ring assembly in internal combustion engines
… attributed to the reciprocating motion of the piston-assembly. Besides the adverse effect of friction on fuel economy, the intricate dynamics of the piston-assembly tend to significantly influence the thermal efficiency through blow-by, the engine durability through wear, and the engine noise …
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Measurement of piston / piston-ring friction and oil film thickness in an internal combustion engine
… investigation of the lubrication of the piston/piston-ring and cylinder liner interface in internal combustion engines. It begins by identifying the relevance of such experimental work and reviews studies carried out by other investigators from the early 1900's to the present day. …
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The effect of surface finish on piston ring-pack performance in advanced reciprocating engine systems
Frictional losses in the piston ring-pack of an engine account for approximately 20% of the total frictional losses within an engine. Methods of surface texture optimization were investigated to reduce piston ring-pack friction and increase engine brake thermal efficiency. Adverse effects of …
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Piston ring pack design effects on production spark ignition engine oil consumption : a simulation analysis
… to an engine's total oil consumption is the piston ring-pack. As a result, optimization of the ring pack is becoming more important for engine manufacturers and lubricant suppliers. This leads to current efforts to control the oil transport and flow through the ring pack. Decreasing the …
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Modeling the lubrication of the piston ring pack in internal combustion engines using the deterministic method
Piston ring packs are used in internal combustion engines to seal both the high pressure gas in the combustion chamber and the lubricant oil in the crank case. The interaction between the piston ring pack and the cylinder bore contributes substantially to the total friction power loss for IC …
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A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines
… be achieved through engine friction reduction. Piston and piston rings contribute approximately half of the total engine friction and are therefore central to friction reduction efforts. The most common method to reduce mechanical losses from piston rings has been to lower ring tension, the …
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Fast modeling of multi-phase mixture transport in piston/ring/liner system via GAN-augmented progressive modeling
… mechanical and physical processes including ring dynamics, gas flow, oil redistribution and multi-phase transport to paint a detailed picture of the global lubrication environment in the piston/ring/liner system. The main contributions of this thesis can be summarized as the following: 1) …
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Analysis of lubricant film thickness and distribution along the piston-ring/liner interface in a reciprocating engine
… of Technology, Dept. of Mechanical Engineering, 1998.
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Modeling of contact between liner finish and piston ring in internal combustion engines based on 3D measured surface
… internal combustion engines. Interaction between piston ring pack and cylinder liner finish accounts for nearly 20 percent of the mechanical losses within an internal combustion engine, and is an important factor that affects the lubricant oil consumption. Among the total friction between piston …
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Fluid mechanics of lubricant transport in non-contact regions in the piston ring pack in internal combustion engines
… a long-lasting challenge for the design of the piston ring pack in internal combustion engines. In order to achieve a satisfactory compromise, a systematic understanding of the lubricant transport in the piston ring pack is of critical importance. In the context of increasingly stringent …
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