Load characteristics of engine main bearing : Comparison between theory and experiment

Cho, Michael; Oh, Dae-Yoon; Seung-Hyuk, Ryu; Han, Dong-Chul

doi:10.1007/bf02984019

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…There are different traditional methods to calculate the main bearing load, as reviewed in [4] and [5]. Cho et al [6], experimentally measured the main bearing force components of a four in-line engine, in vertical and horizontal directions, using two different ring type load cells mounted in each main bearing cap bolt. They compared the experimental results with the theoretical results obtained by the statically determination method.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bearing Steps on Probable Wear Damage of Main Bearings of an IC Engine

Karimaei

Chamani

2021

IJAME

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When two bearing shells are assembled in the bearing housing, it is possible that the edges of the two shells do not fit in the radial direction completely and have an offset relative to each other. This assembly error, which can have different causes, is called the bearing step in this paper. The bearing step can lead to wear damage in bearings. The effects of bearing step on the lubrication performance of main bearings and the probable wear damage have been investigated. To calculate the bearing lubrication characteristics such as maximum oil film pressure and minimum oil film thickness, elasto-hydrodynamic model, which includes the mass conservation algorithm, has been applied. The objective of this work is to investigate the effects of bearing steps on the lubrication performance of the main bearings and assess the probable wear damage of main bearings due to bearing step. The prediction of elasto-hydrodynamic model is very proximate to what really happened. The results show that for the under-study 12-cyl engine, main bearing No. 2 involved with medium wear damage. Wear damage in this main bearing No. 3 is not a concern, while main bearing No.4, 5 and 6 do not predict the probability of wear damage. For main bearing No.7, it is concluded that considering step and bore relief in simulation has high importance so that the solution without step and bore relief does not predict the wear, but with step and bore relief predicts medium wear damage.

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Section: Introductionmentioning

confidence: 99%

Effects of Bearing Steps on Probable Wear Damage of Main Bearings of an IC Engine

Karimaei

Chamani

2021

IJAME

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show abstract

“…There are different traditional methods to calculate the main bearing load as reviewed in [2] and [3]. Cho et al [4], experimentally measured the main bearing force components of a four-in-line engine, in vertical and horizontal directions, using two different ring type load cells, mounted in each main bearing cap bolt. They compared the experimental results with the theoretical results obtained by the statically determination method.…”

Section: Introductionmentioning

confidence: 99%

Effect of Crankshaft and Crankcase Material Stiffness on Load Distribution in Main Bearings

Karimaei

Chamani

2018

IJAME

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In multi-cylinder diesel engines, hydrodynamic pressure distribution of main bearings has significant effect on the load distribution applied on engine crankcase, therefore, has an effect on the stress distribution and deflection of crankcase. Flexibility of crankshaft and crankcase assembly has significant effect on load distribution in engine main bearings. In this paper, the effect of elastic deformations of both crankshaft and crankcase on the load distribution in the main bearings is studied. Considering deformations of crankcase and crankshaft together with the elasto-hydrodynamic (EHD) analysis of main bearing is vital to obtain the realistic load distribution and accurate main bearing performance. At the beginning, the results of flexible body dynamic analysis of engine crank train with considering EHD joint for main bearings are presented and the main bearing force and moment are compared with rigid body dynamic analysis. Then, the effects of crankshaft and crankcase flexibilities on main bearing force and moment are studied. Several models with different flexibilities and stiffness of crankcase and crankshaft were prepared using Elasto-hydrodynamic simulation of diesel engine main bearings. According to the results, the load distribution on the engine main bearings and consequently the bearing shell deformation are affected by crankcase and crankshaft elasticities. A fast and time-saving method to obtain reasonably accurate results is proposed in the present paper.

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Intension Analysis of 3-D Finite Element Analysis on 380 Diesel Crankshaft

Meng

Liu

et al. 2010

2010 International Conference on Computational and Information Sciences

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Load characteristics of engine main bearing : Comparison between theory and experiment

Cited by 8 publications

References 7 publications

Effects of Bearing Steps on Probable Wear Damage of Main Bearings of an IC Engine

Effects of Bearing Steps on Probable Wear Damage of Main Bearings of an IC Engine

Effect of Crankshaft and Crankcase Material Stiffness on Load Distribution in Main Bearings

Intension Analysis of 3-D Finite Element Analysis on 380 Diesel Crankshaft

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