A single cylinder engine for crankshaft bearings and piston friction losses measurement

Cerrato, R; Gozzelino, R.; Ricci, R.

doi:10.4271/841295

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…This design was developed and used by many other researchers [33][34][35][36][37][38][39]. An alternative solution is to seal the cylinder by extending the cylinder head into the cylinder and fitting a sealing element, such as an O-ring, as illustrated in Figure 3 and adopted by Cerrato et al [40].…”

Section: O-ring Sealsmentioning

confidence: 99%

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

et al. 2021

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Several approaches have been developed to measure instantaneous friction between the piston assembly and cylinder in internal combustion (IC) engines, such as floating-liner, reciprocating liner, instantaneous mean effective pressure (IMEP), fixed sleeve, and (P-ω) method and tribological bench tests. However, the “floating-liner method” and the “(IMEP) method” are the most common methods used to measure instantaneous friction between the piston assembly and IC engines. This paper critically evaluates different approaches to the design of the “floating-liner”. The paper begins by discussing piston assembly frictional losses and their significance and then discuss the development of instantaneous piston-friction measurements. After that, it reviews the main design challenges in the floating-liner approach. “Methods of cylinder sealing” and “force balancing methods” are also reviewed. Design challenges associated with firing operation were presented. Floating-liner designs were classified into different categories with a detailed presentation of the features of each. The paper ends by presenting a range of broad recommendations for further work which would benefit future designs.

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Section: O-ring Sealsmentioning

confidence: 99%

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

et al. 2021

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“…Lu and Khonsari et al [21] generated interesting results using the Lewis LRI-8H apparatus studying the effects of bearing load on the Stribeck curve. Cerrato et al [22] modified the main bearing of a single cylinder engine, extensively modifying the bearing housing, to measure the frictional performance. Similarly, other researchers like Syverud [23], Sinanoglu et al [24], Sorab et al [25], Tseregounis et al [26], and Unlu and Atik [27] have carried out interesting experiments on test rigs, looking at details such as the effects of parameters like temperatures, pressures, oil film thickness, etc.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental evaluation of engine bearing performance

Mufti

Priest

2008

Proceedings of the Institution of Mechanical Engineers, Part J:

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Measurements of total engine bearing friction have been carried out on a singlecylinder gasoline engine under fired conditions. The bearing friction was measured indirectly by measuring the total engine friction, piston assembly friction, and valve train friction. Total engine friction was measured via pressure-volume (PV) diagram, whereas piston assembly friction measurement was carried out using the indicated mean effective pressure method. Valve train friction was measured using instrumented camshaft drive pulleys. All the engine auxiliaries were independently driven electrically. Engine bearing friction was measured under different engine operating conditions. The hydrodynamic lubrication regime occurred under most of the engine operating conditions, although at lower engine speeds and higher lubricant temperatures a transition from hydrodynamic to boundary/mix lubrication regime occurred. The effect of two different lubricants SAE 0W20 and SAE 5W30 on engine bearing performance was investigated. The adverse effects of viscous oil at low lubricant temperature were notable, as were the benefits at higher lubricant temperature. Predicted results from a number of engine bearing friction mathematical models have been compared with the experimental results. The comparative study showed that the results generated through the short bearing mobility method under cavitation conditions were close to the experimental data. This experimental system can be used to study bearing design parameters, bearing materials, lubricant chemistry, and engine operating conditions on the bearing performance under realistic conditions in its original environment.

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Experimental Evaluation of Piston-Assembly Friction Under Motored and Fired Conditions in a Gasoline Engine

Mufti

Priest

2004

Journal of Tribology

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Piston-assembly friction measurement has been carried out on a single-cylinder gasoline engine using the IMEP (indicated mean effective pressure) method at realistic engine speeds and loads without any major engine modifications. Instantaneous and mean piston-assembly friction were measured under motored and fired conditions at different lubricant temperatures. The forces acting on the piston assembly were carefully determined by measuring the cylinder pressure, crankshaft angular velocity, and strain in the connecting rod. The difference between the resulting gas pressure, inertia, and connecting rod axial forces acting on the piston yields the piston-assembly friction. To achieve this with confidence, an advanced instrumentation, telemetry, and data acquisition system was designed and developed, giving special attention to the synchronization and simultaneous sampling of analog and digital channels. Experiments are reported for piston-assembly friction at a range of engine operating conditions with different lubricant formulations, with and without a friction modifier.

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A single cylinder engine for crankshaft bearings and piston friction losses measurement

Cited by 8 publications

References 3 publications

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

A Critical Review of Approaches to the Design of Floating-Liner Apparatus for Instantaneous Piston Assembly Friction Measurement

Theoretical and experimental evaluation of engine bearing performance

Experimental Evaluation of Piston-Assembly Friction Under Motored and Fired Conditions in a Gasoline Engine

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