Proceedings of SerbiaTrib '13

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detect failures in diesel engine fuel injectionsystems, Wear 260, pp. 562–566, 2006.[7] R.I. Taylor, R.C. Coy: Improved fuel efficiency bylubricant design, 2001[8] M. Piest and C.M. Taylor: Automobile enginetribology, 2000.[9] S. Peric, The development of a method of diagnosisthe condition from the aspect of physical-chemicaland tribological characteristics of lubricating oils ofvehicles, PhD thesis, Military Academy, Belgrade,2009.[10] S. Perić, B. Nedić: Monitoring oil for lubrication oftribomechanical engine assemblies, Journal of theBalkan tribological association 16, pp. 242-257,2010.246 13 th International Conference on Tribology – Serbiatrib’13
Serbian TribologySocietySERBIATRIB ‘1313 th International Conference onTribologyKragujevac, Serbia, 15 – 17 May 2013Faculty of Engineeringin KragujevacADVANTAGES AND APPLICATIONS OFSELF-LUBRICATING PLASTIC BEARINGSAleksandar Marinković 1 , Miloš Stanković 21 Mechanical Engineering Faculty, University of Belgrade, Serbia, amarinkovic@mas.bg.ac.rs2 Inovation Center of Mechanical Engineering Faculty, Serbia, mstankovic@mas.bg.ac.rsAbstract: Self-lubricating sliding bearings are widely used in industrial applications and we could assortthem in several groups towards manufacturing or lubrication. Some of them, such are oil-retaining porousbearings have been long time studied, but plastic bearings are not enough investigated where we have justsome of experimental results. Self-lubricating plastic bearings are produced on polymer basis which isoptimized with fiber reinforcement and solid lubricants. They are an ideal solution for machinery thatrequire clean and oil-free operation. Plastic bearings also perform well in dirty environments since there isno oil to attract dust and dirt. Authors of this paper describe main performances and reasons why this kindof bearings are current widely used. A few typical applications of plastic bearings are presented in thepaper, taking into account advantages in lubrication, production and maintenance costs in comparison withclassical rolling and sliding bearings.Keywords: self-lubricating, plastic sliding bearing, polymers, dry operating.1. INTRODUCTIONMost of machine and equipment manufacturersare trying to eliminate or at least to reducelubrication systems in aim to settle production costsdown without sacrificing machine performances.According to significant Bearing Companiesinvestigations, more than 50% of bearing failuresare lubrication related (Figure 1). In a study byMIT, USA it was estimated approximately $240billion is lost annually due to downtime and repairsto equipment damaged by poor lubrication [1].By eliminating lubrication from machinery,equipment manufacturers can minimize the costsand risks associated with maintenance for the enduser. Because of lubrication problem and costs,which are dominant during the working life, apossible solution is to apply dry running plasticsliding bearing.Plastic bearings are produced on polymer basiswhich is optimized with fibre reinforcement andsolid lubricants. They are an ideal solution formachinery that requires clean and oil-freeoperation. Plastic bearings are doing well in dirtyenvironments since there is no oil to attract dust anddirt.2. PLASTIC BEARING MATERIALSThere are several typical groups of materials forplastic bearings, taking into account their physicalmechanicalperformances [2]:- Thermoplastic materials- Phenol and Epoxy plastic materials- Elastomers- Multilayer plastic materialsFigure 1. Types of lubricated related bearing failures13 th International Conference on Tribology – Serbiatrib’13 247
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SerbianTribologySocietyFacultyofEng
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Serbian Tribology SocietyUniversity
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Supported byMinistry of Education,
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PrefaceThe International Conference
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ContentsPlenary Lectures1. THE GREE
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27. WEAR CHARACTERISTICS OF HYBRID
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Tribometry57. PRELIMINARY STUDY ON
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Plenary Lectures13 th International
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Serbian TribologySocietySERBIATRIB
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Figure 4. Diagram of the height and
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Realization of the approach is base
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edge without chamfer and smaller ra
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Figure 7. Accumulated tool life in
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Figure 13. Calculated and measured
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Friction deformation of the bronze
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engine cylinders of 2-cylinder-twot
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Table 1: Chemical composition of sa
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Table 4: Comparative wear-resistanc
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- measuring of coating thickness h
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Figure 5. Functional scheme of the
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Table 2. Test results for massive w
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knowledge transfer in the field ofm
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Table 1. Parameters of the electroc
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Figure 6. Wear resistance by linear
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coatings and observed their good we
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c)a)Figure 2: SEM images and micros
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Room temperature 300°CNi/µSiCNiNi
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COF [-] COF [-]Fig.9: COF graphs at
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about 260 nm is related to isolated
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contact’s conformity [18] they ob
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In order to calculate the metallic
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microscopic inspection of the Rp3 s
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otating plate. The shaft passes thr
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similar trends of variation are obs
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smooth, gear fiber-mild steel rough
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[2] Tabor, D.: “Friction and wear
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(10, 50 and 100 N) against surface
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[9] B.R. Gligorijevic, A. Vencl, B.
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dielectric properties, high resista
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parameter, Sv, was slightly influen
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dependence of roughness height and
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Polyethylenes with a molecular weig
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[9] K.S. Kanaga Karuppiah, A.L. Bru
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MgCO3•CaCO3 (13% Mg), and carnall
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fully compatible with MRI/MSCT imag
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5. CONCLUSIONThe magnesium alloys a
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Zinc dialkyldithiophosphate (ZDDP)
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C- Lower deposits with NPNA on comb
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films. Carraro et al. [10] examined
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PlateCount No.Critical Load ( N)120
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solid melt of ZA27 alloy using mech
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SiC particles are uniformly distrib
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in number of micro-cracks and clust
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PBT has the average values of the f
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mechanical pressure and thermal loa
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3. EXPERIMENTAL RESULTSTaking into
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[12] L. Blunt De, X. Jiang: Advance
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2. EXPERIMENTALTESTING2.1 MaterialT
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figure 3a it could be seen that the
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and lubrication is done so that the
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5. CONCLUSIONFigure 11. The accumul
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esistance was found for composite c
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onze, which is embedded within the
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The test contact pair meets the req
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complete. The SEM analysis maycontr
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tg( ) tg 100, [%] (2)tgwhere are:
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corresponding to the maximum value
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electrostatics [17]. Due to the fle
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250nm size have been observed, acco
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ETH Zurich, Switzerland, where all
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comparison with the synthetic reinf
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3. RESULTS AND DISCUSSION3.1 Micros
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(a)(b)Figure 4. Showing (a) variati
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composites. But the composite compo
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coated and uncoated region after ad
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has been measured between the top s
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Fig. 9 shows the wear track obtaine
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Mica samples preparationFor the ads
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According to the AFM results in fig
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[21] B. G. Sharma et al.: Character
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chemical vapor deposition method wi
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analysis (a) and an approximate che
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Table 3. Friction coefficients of s
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A.K.Oleynik, V.M.Matsevity, ea.]. /
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Page 211 and 212: Most of the friction units of produ
Page 213 and 214: In order to provide both high parts
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Page 217 and 218: Table 3. Experimental and calculate
Page 219 and 220: For developing the numerical model
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Page 245 and 246: 2. EFFICIENCY OF CYCLO DRIVEEfficie
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Page 273 and 274: Krytox 215 (µ = 0.03204 Pa.s)Figur
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Page 283 and 284: AcknowledgementThe part of this res
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Page 293 and 294: Table 2. Impact toughness of some t
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Page 305 and 306: 4. CONCLUSIONTools of virtual produ
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Page 309 and 310: 3. ANALYSIS OF RESULTSThe results o
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Figure 15. Surface roughness regard
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From the analysis of the diagram it
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comparison from economic, energy co
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Advantages and disadvantages of tra
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The information provided by footwea
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Force (N)5,554,543,532,521,510,50Ex
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additives, that had been, until rec
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Figure 1. Test results for samples
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Table 7. Test results of oil sample
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Input parameters- Current intensity
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edge formed into a thin line. At th
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Lower values of current are not res
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Table 1. Chemical composition of si
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flowable at high temperatures and v
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holes (pits) emerge in the shape of
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[4] W. Schatt, K-P. Wieters, Pulver
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assumption allows us to use, instea
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where P is the load, a - radius of
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determination (total running in tim
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μm, compared with Figure 17, wich
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Serbian TribologySocietySERBIIATRIB
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Especially when the chain transfer
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is obvious that this isa so-calledw
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winches. The authors are inclined t
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find parameters of robot laser hard
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each of which is measured by the le
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Fractal dimensions were determined
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Figure 3. Modified force acting sch
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0.25Lubricant: L3DC 04Friction coef
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nanocomposites. The influence of fi
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4. RESULTS AND DISCUSSION4.1 Morpho
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Figure 6. Loading and unloadin vers
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3 8 12 1 4 2 4
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The material after qualifying the r
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It has already been mentioned that
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Degradation & Stability, Vol. 69, N
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conformance to researchers’ requi
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This part is assembled of pneumatic
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matrixes describe the state of the
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values influence of themeasurement
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Figure 1. Friction stir weldinga -
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(t 2 t
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M fr / T [-] [-]10.90.80.70.60.50.4
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M fr / T [-]10.90.80.70.60.50.40.30
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experimentally determined that for
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4. DISCUSSIONAccording to the theor
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2.1 The life cycle of the reportThe
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Obviously the report is checked and
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uticaja na osnovu kompozita, a time
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5. ZAKLJUČCIStruktura tiksolivene
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dobijene različite karakteristike
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vizuelno, na dnevnoj svetlosti, pod
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LITERATURA[1] Зинченко В.
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Slika 1. Rotorni bager - glodar VII
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stvaraju sliku stanja i svoja zapa
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njihovih kotrljanih elemenata. Mere
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postupka i uticaja parametara depoz
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posledica različite raspodele mikr
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ZrO 2 Y 2 O 3 je takođe zbog oksid
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3.2 Pneumatska osetljivostOblast pr
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p mg (δ), koji je zbog malih struj
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PNEUMATIC PROBE HEAD SELECTION FOR
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1. Podsistem kopanja2. Podsistem pr
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Slika 3. Kriva habanjaNa tom dijagr
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Mjereni su parametri habanja i pril
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preše prevladavaju kombinirani uvj
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a) b)Slika 5. Karakteristična mikr
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varijantnih materijala u dostavnom
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Jovanović D. 414, 446KKaleicheva J
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CIP - Каталогизација
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