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Effects of thrust washer bearing surface characteristics on planetary gear train wear
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). (SKD System and component design)ORCID iD: 0000-0003-4447-3363
Scania CV .
Höganäs AB. (SKD)
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2019 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 432-433, article id 202933Article in journal (Refereed) Published
Abstract [en]

Thrust washers in spur planetary gears are placed between the planet wheel and planet carrier and act as spacers and wear pads. Metal to metal sliding contact between the planet wheel – washer – carrier causes frictional power losses that, combined with starved lubrication, may cause high contact temperatures and thermo-mechanical effects that potentially trigger thermo-elastic instabilities and excessive local wear. The planetary gear system would benefit from a low-friction interface between the washer and the planet wheel. Five washers with different surface treatments were tested in a full-scale gear rig. These tests were also replicated as closely as possible in a pin-on-disc tribometer. The following types of finishing material treatments were studied: a chemical nickel coating plus polymer on a nitro-carburised surface, a combination of nitro-carburization and solid lubricant layers, electroless deposited chemical nickel coating plus polymer, nitro-carburizing, and manganese phosphating. The frictional results indicate that tribometer tests can be used to compare and classify new washer materials. Lab scale tests show that a new experimental self-lubricating tribomaterial that was applied with laser cladding has a promising potential to increase planetary gear train robustness and service life, especially if the surface is fine grinded.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 432-433, article id 202933
Keywords [en]
Thrust washers, Planetary gears, Adhesive wear, Surface treatment, Laser cladding
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Transport Science; Machine Design
Identifiers
URN: urn:nbn:se:kth:diva-258028DOI: 10.1016/j.wear.2019.202933ISI: 000477874700023Scopus ID: 2-s2.0-85067419223OAI: oai:DiVA.org:kth-258028DiVA, id: diva2:1349683
Funder
Swedish Foundation for Strategic Research , SM15-0025
Note

QC 20191007

Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-10-11Bibliographically approved

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Bergseth, EllenSellgren, Ulf
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