Optimization of Lemon Shape Big End Profile Connecting Rod under Engine Operation in Elastohydrodynamic Regime

Galera, Larissa; Rodrigues, Alex Souza

doi:10.4271/2014-36-0309

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…In addition, the corresponding comparisons between the lubrication performance of connecting-rod bearing and the one of main bearings at same engine operating condition (shown in Tables 4,5,6,7,8,9) show that, the maximum oil film pressure of connecting-rod bearing in an engine operating cycle is larger than those of all main bearings, the minimum oil film thickness of connectingrod bearing in an engine operating cycle is smaller than those of all main bearings, and the average frictional power losses of connecting-rod bearing in an engine operating cycle is smaller than those of all main bearings. Also, there is the corresponding difference between the lubrication performances (the maximum oil film pressure, minimum oil film thickness and average frictional power loss in an engine operating cycle) of all main bearings one another at same engine operating condition, and some difference is larger.…”

Section: Resultsmentioning

confidence: 99%

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Lubrication Performance of Connecting-Rod and Main Bearing in Different Engine Operating Conditions

Sun

Zhu

et al. 2019

Chin. J. Mech. Eng.

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Only the lubrication performance at rated engine operating condition was generally analyzed in current design and research of engine connecting-rod and main bearing. However, the actual engine (especially vehicle engine) does not always operate in rated operating condition and its operating condition changes constantly. In this paper, a fourstroke four-cylinder engine is taken as the studying object, the load and lubrication of connecting-rod and main bearing in different operating conditions are analyzed. The load of connecting-rod bearing is calculated by the dynamic calculation method, the loads of all main bearings are calculated by the whole crankshaft beam-element finite element method, and the lubrication performance of connecting-rod and main bearings are analyzed by the dynamic method. The results show that there are major differences in the changes and numerical value at corresponding moment of the loads and lubrication performance of connecting-rod and main bearings in an engine operating cycle in different engine operating conditions; the most unfavorable case of the lubrication performance of connectingrod and main bearings may not take place in the rated engine operating condition. There are also major differences between the lubrication performance of connecting-rod bearing and that of main bearing and between the lubrication performances of main bearings one another. Therefore, it will not be reasonable that the lubrication performance of a certain connecting-rod bearing or main bearing is analyzed in the design of the engine bearing. It is necessary to analyze simultaneously the lubrication performances of all bearings in different engine operating conditions.

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Section: Resultsmentioning

confidence: 99%

“…Zammit investigated the lubrication of crankshaft bearing during engine warm-up [2]. Inui, Jia and Galera et al [3][4][5] studied the factors affecting the lubrication of crankshaft bearing. Gu et al [6] researched the performance of textured crankshaft bearing during an engine cycle.…”

Section: Introductionmentioning

confidence: 99%

Lubrication Performance of Connecting-Rod and Main Bearing in Different Engine Operating Conditions

Sun

Zhu

et al. 2019

Chin. J. Mech. Eng.

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show abstract

“…Numerous studies on the modeling, simulation, and shape design of the main bearing of the engine have been conducted [4][5][6][7][8][9][10]. The simulation results showed that the bearing performance strongly depends on the used profile [4].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that an edge relief profile can help improve the absolute minimum oil film thickness (MOFT), reduce the peak oil film pressure (POFP), and has a potentially adverse effect on the MOFT at the bearing center line. The pros and cons of lemon-shaped micron-profile on big end bearing were evaluated by Galera and Rodrigues [6] using six pa-rameters as evaluation indicators, namely, axil oil flow rate, MOFT, total friction loss (TFL), POFP, peak asperity contact pressure (PACP), and peak total pressure (PTP). The results indicated that the lemon-shaped profile has better performance than the cylindrical one.…”

Section: Introductionmentioning

confidence: 99%

Effects of axial profile on the main bearing performance of internal combustion engine and its optimization using multiobjective optimization algorithms

2021

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The effects of axial profile parameters on the main bearing performance of the engine were investigated through the numerical method based on elasto-hydrodynamic lubrication theory, average flow, and asperity contact model. Results show that quadratic profile significantly improves the bearing performance, and the influence of profile varies with its width-toheight ratio. The performance is most improved when the ratio is between 0.8 and 2. An artificial neural network fitting model was developed to predict bearing performance, and multiobjective optimum analyses were performed using genetic algorithm and particle swarm optimization. The optimization goals are average peak asperity contact pressure and average total friction loss. The obtained Pareto front roughly includes three groups, and solutions in group 1 achieve a balance of the two goals, with a width-to-height ratio of 1.5-2. Finally, bearing friction tests were conducted on four profiled bearings to verify the simulation model and optimization results.

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Importance of Connecting Rod and Crankshaft Roughness Accuracy on Sliding Bearing Performance

Galera

Rodrigues

Malburg³

2015

SAE Technical Paper Series

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Optimization of Lemon Shape Big End Profile Connecting Rod under Engine Operation in Elastohydrodynamic Regime

Cited by 4 publications

References 2 publications

Lubrication Performance of Connecting-Rod and Main Bearing in Different Engine Operating Conditions

Lubrication Performance of Connecting-Rod and Main Bearing in Different Engine Operating Conditions

Effects of axial profile on the main bearing performance of internal combustion engine and its optimization using multiobjective optimization algorithms

Importance of Connecting Rod and Crankshaft Roughness Accuracy on Sliding Bearing Performance

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