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Filtration and coating effects on self-generated particle wear in boundary lubricated roller bearings
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2005 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 38, no 2, 145-150 p.Article in journal (Refereed) Published
Abstract [en]

A specially designed test system involving boundary lubricated roller bearings was used to study wear at low particle concentration levels. A separate oil system circulated the oil through the test bearings. The effects of self-generated contaminants from the system were studied. Even at very low concentration levels, self-generated contaminants can cause significant wear. The concentration of self-generated particles was very high during the running-in period. It is therefore important that the filtration be very efficient during this period. The experimental results show that filtration during run-in for 1 h with a 3 μm filter can reduce both the mass loss and the number of self-generated particles by a factor of 10. Furthermore, the results also show that while the bearings with standard rollers can have significant wear, those with coated rollers are at the same time almost unaffected by wear. Also, the number of particles generated in the contact was significantly less when using coated rollers. There were twice as many self-generated particles when using a standard bearing as those compared with a coated bearing.

Place, publisher, year, edition, pages
2005. Vol. 38, no 2, 145-150 p.
Keyword [en]
contaminants, wear, self-generated, roller bearings
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-4916DOI: 10.1016/j.triboint.2004.07.022ISI: 000226170600007Scopus ID: 2-s2.0-8744307923OAI: oai:DiVA.org:kth-4916DiVA: diva2:7015
Note
QC 20100915Available from: 2005-02-09 Created: 2005-02-09 Last updated: 2017-12-05Bibliographically approved
In thesis
1. On wear in rolling/sliding contacts
Open this publication in new window or tab >>On wear in rolling/sliding contacts
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The aim of this thesis is to increase the understanding of wear in rolling/sliding contacts such as the wheel-rail contact for railroads and the roller-washer contact for roller bearings.

The Stockholm commuter train network has been the subject of papers A and B in this thesis in which the wear and surface cracks on rails has been observed for a period of three years. By comparing the wear depth with the crack length, equilibrium between these two damage mechanisms was found for a lubricated rail. By using a lubricant with friction modifiers the stresses was low enough to prevent crack propagation; at the same time, the rail was hard enough to reduce the wear rate. This is probably the most favourable state in terms of rail maintenance cost.

Roller bearings subjected to lubricant borne particles have been the subject of papers C, D and E in this thesis. Particles in the lubricating oil can have a significant impact on the wear in lubricated contacts. Even at low concentration levels can self-generated particles cause significant wear. The here presented results shows that filtration during run-in can significantly reduce both the mass loss and the number of self generated particles. A series of experiments has been carried out to study the wear of roller bearings by ingested lubricant borne hard particles. The form of the worn profile and the length of wear scratches correspond closely to the sliding within the contact. A count of the number of wear scratches on the rolling element surface indicates that the contact concentrates particles. A novel wear model based on the observation of a single point on the contacting surface when a concentration of particles passes through it has been developed and the necessary data for the model has been determined from the experiments. Comparison of the simulation results with the experimental results shows good qualitative agreement for the form change of the washer surfaces.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. x, 20 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2005:03
Keyword
Technology, wear, rolling, sliding, contact, environment, TEKNIKVETENSKAP
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-122 (URN)
Public defence
2005-02-11, Kollegiesalen, Valhallavägen 79, Stockholm, 09:30
Opponent
Supervisors
Note
QC 20101015Available from: 2005-02-09 Created: 2005-02-09 Last updated: 2012-01-27Bibliographically approved

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Olofsson, Ulf

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