Wear of Dynamically Loaded Hydrodynamic Bearings by Contaminant Particles

1980 ◽  
Vol 102 (4) ◽  
pp. 452-458 ◽  
Author(s):  
A. Ronen ◽  
S. Malkin ◽  
K. Loewy
Keyword(s):  
Wear Intensity ◽  
Linear Wear ◽  
Connecting Rod ◽  
Operating Cycle ◽  
Hydrodynamic Bearings ◽  
Oil Film ◽  
Dimensional Changes ◽  
Air Cleaners ◽  
Dynamic Loading Conditions ◽  
Engine Bearing

An investigation is reported on the wear of hydrodynamic bearings by contaminant particles in the oil under dynamic loading conditions. A test bearing rig was developed to dynamically simulate an automotive connecting rod engine bearing, and the contaminant additions were of the types normally used for testing of automotive oil filters and air cleaners. Shaft and linear wear for clean and contaminated oil were measured both in terms of dimensional changes and weight loss at two different rotating speeds. As compared with clean oil, both shaft and linear wear were found to increase by typically a factor of 20 when running with the contaminated oil. A direct correlation was found between the local oil film thickness history and wear intensity for both the clean and contaminated oil. The wear tended to increase steeply at those locations where the oil film was smaller for a greater portion of the operating cycle.

scholarly journals A Visualization Solution of the Stress State of Connecting-rod Big End in the Experimental Device for Lubricating Condition of the Connecting-rod Big End Bearing

2020 ◽  
Vol 30 (7) ◽  
pp. 37-42
Author(s):  
Thi Thanh Hai Tran ◽  
Anh Dung Le ◽  
Tien Dat Do
Keyword(s):  
Stress State ◽  
Ccd Camera ◽  
Experimental Device ◽  
Connecting Rod ◽  
Operating Cycle ◽  
Visualization System ◽  
Oil Film ◽  
Rod Model ◽  
Load Simulation ◽  
Oil Film Pressure

This paper presents a visualization solution of the stress state of the connecting-rod big end in the experimental device for lubricating of the connecting-rod big end bearing. The connecting-rod model is in photoelastic material that is subjected to the load simulation corresponding to the engine's operating cycle. This experimental device and the connecting-rod model are used to determine the load diagram, measure the oil film pressure, oil film thickness, oil film temperature. In this study, a visualization system of stress state in the connecting-rod big end is built that stress of connecting-rod is one of the characteristics when we study the connecting-rod big end bearing. The stress state of the connecting-rod is visualized by the transmission photoelasticimetry. This method allows the visualization of the isochrones fringes, which are lines of equal difference regarding the main stress in the connecting-rod. The visualization system consists of a polarizer, two quarter ware blades, and an analyzer. The stress contour’s images of the connecting-rod at different angles of the crankshaft are realized by a CCD camera. The stress state in the connecting-rod is compatible with the load applied.

Stress Distribution Analysis on Alloy Layer of High Power Marine Diesel Engine Bearing Bush

2013 ◽  
Vol 331 ◽  
pp. 148-152
Author(s):  
Xiu Xu Zhao ◽  
Zhi Xiang Hu ◽  
An Jian Huang
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Alloy Layer ◽  
Marine Diesel Engine ◽  
Oil Film ◽  
Marine Diesel ◽  
Bearing Alloy ◽  
Stress And Strain Distribution ◽  
Engine Bearing ◽  
Oil Film Pressure

According to the characteristics of large size, small clearance ratio, high oil film pressure and thin oil film thickness in the actual conditions of high power marine diesel engine bearing, this Paper analyzes oil film pressure distribution on inner surface of bearing bush based on the finite difference method, uses finite element method to establish the hierarchical model, and analyzes stress and strain distribution on bearing alloy. In addition, this Paper researches the changes of stress and strain distribution on bearing alloy layer when alloy layer thickness changes for the optimization design of high power marine diesel engine bearing bush.

Study of Oil Film Heat Transfer in Gas Turbine Engine Bearing Chamber

2021 ◽  
Author(s):  
Illia Petukhov ◽  
Taras Mykhailenko ◽  
Oleksii Lysytsia ◽  
Artem Kovalov
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Flow Core ◽  
Two Phase ◽  
Turbine Engine ◽  
Oil Film ◽  
Phase Medium ◽  
Engine Bearing

Abstract A clear understanding of the heat transfer processes in a gas turbine engine bearing chamber at the design stage makes it possible to properly design the lubrication and sealing systems and ensure the future bearing safe operation. The heat transfer coefficient (HTC) calculated based on the classical Newton-Richman equation is widely used to represent the heat transfer data and useful for the thermal resistance analysis. However, this approach is only formally applicable in the case of a two-phase medium. While there is a need to model a two-phase medium, setting the flow core temperature correctly in the Newton-Richman equation is an issue that is analyzed in this study. The heat from the flow core is transferred to the boundary of the oil film on the bearing chamber walls by an adjacent air and precipitating droplets. The analysis showed that droplet deposition plays a decisive role in this process and significantly intensifies the heat transfer. The main contribution to the thermal resistance of internal heat transfer is provided by the oil film. In this regard, the study considers the issues of the bearing chamber workflow modeling allowing to determine the hydrodynamic parameters of the oil film taking into account air and oil flow rates and shaft revolutions. The study also considers a possibility to apply the thermohydraulic analogy methods for the oil film thermal resistance determination. The study presents practical recommendations for process modeling in the bearing chamber.

A study on the influence of oil film lubrication to the strength of engine connecting rod components

2016 ◽  
Vol 63 ◽  
pp. 94-105 ◽  
Author(s):  
Jun-chao Zhu ◽  
Han-hua Zhu ◽  
Shi-dong Fan ◽  
Liang-jun Xue ◽  
You-feng Li
Keyword(s):  
Connecting Rod ◽  
Oil Film ◽  
Film Lubrication

Investigation of Friction and Wear of Dynamically Loaded Hydrodynamic Bearings With Abrasive Contaminants

1983 ◽  
Vol 105 (4) ◽  
pp. 559-567 ◽  
Author(s):  
A. Ronen ◽  
S. Malkin
Keyword(s):  
Dynamic Loading ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Test System ◽  
Hydrodynamic Bearings ◽  
Abrasive Particles ◽  
Oil Supply ◽  
Dynamic Loading Conditions ◽  
Supply Systems ◽  
Bearing Friction

A test system is described for investigating friction and wear of hydrodynamic bearings under cyclical dynamic loading conditions with contaminant abrasive particles in the oil supply. Dynamic loading on the test bearing is synchronized with the shaft rotation, so that the oil film thickness history can be determined from the measured shaft orbit for any point on the shaft and liner periphery. Either clean or contaminated oil can be supplied to the test bearing from two separate oil supply systems. Experimental results obtained for six shaft/liner bearing material combinations were similar to those previously obtained for static loading. The friction and wear behavior were found to depend on the relative hardnesses of the shaft and liner. A larger shaft-to-liner hardness ratio generally resulted in more shaft wear and less liner wear. This is attributed to an increased tendency for abrasive particles to partially embed in the liner and cut the shaft when the shaft is harder and/or the liner is softer. With partial embedding, high bearing friction indicative of continuing abrasion persists after changing from contaminated to clean oil.

Elastic Connecting-Rod Bearing With Piezoviscous Lubricant: Analysis of the Steady-State Characteristics

1979 ◽  
Vol 101 (2) ◽  
pp. 190-197 ◽  
Author(s):  
B. Fantino ◽  
J. Frene ◽  
J. Du Parquet
Keyword(s):  
Steady State ◽  
Film Thickness ◽  
Plane Elasticity ◽  
Operating Conditions ◽  
Maximum Pressure ◽  
Connecting Rod ◽  
Oil Film ◽  
Lubricant Analysis ◽  
Relative Eccentricity ◽  
Dimensional Equation

The effect of the deformation of an automotive connecting-rod on the oil film characteristics are studied. The simultaneous elastic deformation and pressure distribution are obtained by iterative methods in steady-state conditions under realistic speeds and loads (5500 rpm, 25,000 N). Plane elasticity relations are used in this study. The following parameters are investigated: —bearing characteristics: bearing thickness B and bearing clearance C, —operating conditions: journal speed N and applied load W, —lubricant: viscosity μ0 and piezoviscous coefficient α. As a result of the deformation, the maximum pressure and the attitude angle are decreased and the relative eccentricity is greatly increased. The minimum oil film thickness is slightly but systematically decreased. The piezoviscosity effect is noticeable only at high loads: it increases slightly the oil film thickness and the maximum pressure. An empirical dimensional equation for the minimum oil film thickness hm is derived numerically for the bearing considered. Thus: hm∼μ0NW0.5(1+0.06108α)B0.12C0.09

A Measurement of Oil Film Pressure Distribution in Connecting Rod Bearing With Test Rig

1992 ◽  
Vol 35 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Tsuyoshi Masuda ◽  
Kenshi Ushijima ◽  
Kyugo Hamai
Keyword(s):  
Pressure Distribution ◽  
Connecting Rod ◽  
Test Rig ◽  
Film Pressure ◽  
Oil Film ◽  
Oil Film Pressure
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