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Author : Brian Leonard Ruddy
Release : 1979
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis The Lubrication and Dynamics of Piston Rings and the Theoretical Prediction of Ring Pack Gas Flow by : Brian Leonard Ruddy
Download or read book The Lubrication and Dynamics of Piston Rings and the Theoretical Prediction of Ring Pack Gas Flow written by Brian Leonard Ruddy. This book was released on 1979. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. Dowson
Release : 2017-05-04
Genre : Technology & Engineering
Kind : eBook
Book Rating : 084/5 ( reviews)
Book Synopsis Tribology of Reciprocating Engines by : D. Dowson
Download or read book Tribology of Reciprocating Engines written by D. Dowson. This book was released on 2017-05-04. Available in PDF, EPUB and Kindle. Book excerpt: Tribology of Reciprocating Engines documents the proceedings of the 9th Leeds-Lyon Symposium on Tribology held at the University of Leeds, England on September 7-10, 1982. This book emphasizes advances in the working principals of the tribological components that operate with relative motion. The topics discussed include the dynamic analysis of engine bearing systems, measurement of oil film thickness in diesel motor main bearings, and temperature variations in crankshaft bearings. The theoretical and experimental study of ring-liner friction, tribology in the cylinders of reciprocating compressors, and lubricant properties in the diesel engine piston ring zone are also described. This text likewise considers the metallurgy of scoring and scuffing failure, impact of oil contamination on wear and energy losses, and role of tappet surface morphology and metallurgy in cam/tappet life. This compilation is a good reference for triblogists, lubrication engineers, and specialists researching on reciprocating engines.
Author : Ke Jia (S. M.)
Release : 2009
Genre :
Kind : eBook
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Book Synopsis A Coupled Model for Ring Dynamics, Gas Flow, and Oil Flow Through the Ring Grooves in IC Engines by : Ke Jia (S. M.)
Download or read book A Coupled Model for Ring Dynamics, Gas Flow, and Oil Flow Through the Ring Grooves in IC Engines written by Ke Jia (S. M.). This book was released on 2009. Available in PDF, EPUB and Kindle. Book excerpt: Oil flows through ring/groove interface play a critical role in oil transport among different regions the piston ring pack of internal combustion engines. This thesis work is intended to improve the understanding and modeling capability on this important oil transport mechanism for better analysis in engine oil consumption. A model incorporating ring dynamics, gas flow, and oil flow was developed to study oil transport in the piston ring-pack system. The major new element of this new model is adaptation of a mass conserved two phase oil/gas flow sub-model. Doing so, the present model can describe the oil flows through the ring/groove interface in a consistent manner. The model was applied to a heavy duty diesel engine at maximum power condition and to a SI engine at engine-braking and moderate load conditions. In the diesel application, the model demonstrates that oil can be released through the second ring/groove interface during second ring flutter and ring/groove interface plays positive role in reducing oil consumption and oil residence time. On the other hand, oil can be pumped up into the top ring groove and combustion chamber through the top ring/groove interface at engine braking conditions in the SI engine. Both applications show that oil flow rate through ring/groove interface is most prominent during the period of the engine cycle when the ring motion and gas pressure exhibit dynamic behaviors, and thus show that the coupling of the ring dynamics and gas/oil flows in the present model is essential to predict the oil pumping through ring/groove interface.
Author : Camille Baelden
Release : 2014
Genre :
Kind : eBook
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Book Synopsis A Multi-scale Model for Piston Ring Dynamics, Lubrication and Oil Transport in Internal Combustion Engines by : Camille Baelden
Download or read book A Multi-scale Model for Piston Ring Dynamics, Lubrication and Oil Transport in Internal Combustion Engines written by Camille Baelden. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: Fuel consumption reduction of more than 20% can 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 normal force providing sealing between the piston ring and the cylinder liner. However tension reduction can result in additional lubricant consumption. The objective of this thesis is to understand and model the physical mechanisms resulting in flow of oil to the combustion chamber in order to achieve optimal designs of piston rings. The optimal design is a compromise between friction reduction and adequate gas and lubricant sealing performance. To do so a multi-scale curved beam finite element model of piston ring is developed. It is built to couple ring deformation, dynamics and contact with the piston and the cylinder. Oil flow at the interfaces between the ring and the cylinder liner and between the ring and the piston groove can thus be simulated. The piston ring model is used to study the sealing performance of the Oil Control Ring (OCR), whose function is to limit the amount of oil supplied to the ring pack. The contributions of the three main mechanisms previously identified, to oil flow past the OCR are quantified: - Deformation of the cylinder under operating conditions can lead to a loss of contact between the ring and the liner. - Tilting of the piston around its pin can force the OCR to twist and scrape oil from the liner. - Oil accumulating below the OCR can flow to the groove and leak on the top of the OCR The OCR is found to be flexible enough to limit the impact of cylinder deformation on oil consumption. Both ring scraping and flow through the OCR groove can contribute to oil consumption in the range of engine running conditions simulated. Reduction of scraping is possible by increasing the ability of both OCR lands to maintain contact with the liner regardless of piston groove tilt. The flow of oil through the OCR groove can be reduced by designing appropriate draining of oil in the groove and an adequate oil reservoir below the OCR. The piston ring oil transport model developed in this thesis will be a valuable tool to optimize ring pack designs to achieve further ring pack friction reduction without increasing oil consumption.
Author : Steve M. Rohde
Release : 1979
Genre : Energy conservation
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Energy Conservation Through Fluid Film Lubrication Technology by : Steve M. Rohde
Download or read book Energy Conservation Through Fluid Film Lubrication Technology written by Steve M. Rohde. This book was released on 1979. Available in PDF, EPUB and Kindle. Book excerpt:
