Microscopic investigations into lubricated friction pairs in synchronizers

verfasst von

G. Poll, S. Neudörfer, T. Skubacz

Abstract

An essential component of manually operated vehicle transmissions is the synchronising device. Synchronizers have the task of minimizing the speed difference between the shifted gearwheel and the shaft by means of frictional torque before engaging the gear. Proper operation requires a sufficiently high coefficient of friction. An optimized design of the system with regard to appropriate function and durability on the one hand as well as low cost, low mass, and compact over-all dimensions on the other hand today requires time-consuming and expensive component testing. As it is easier to coat plane surfaces with a friction material than to coat the inner or outer cones of synchronizer rings, this paper investigates if the component tests can be substituted by simpler pin-on-disc type model tests. For this purpose, such model tests and tests with original synchronizers are compared, in particular, regarding the friction characteristics of different materials. Furthermore, a fluorescence-based method is successfully applied to observe the lubricant distribution and the contact conditions during shifts. The investigations reveal that there are limitations to the applicability of tests with plane model pins to real conical component behaviour, which can partly be attributed to differences in drainage efficiency.

Organisationseinheit(en)

Institut für Maschinenkonstruktion und Tribologie

Typ

Artikel

Journal

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

Band

222

Seiten

451-458

Anzahl der Seiten

8

ISSN

1350-6501

Publikationsdatum

05.2008

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Maschinenbau, Oberflächen und Grenzflächen, Oberflächen, Beschichtungen und Folien

Elektronische Version(en)

https://doi.org/10.15488/3020 (Zugang: Offen)
https://doi.org/10.1243/13506501JET353 (Zugang: Geschlossen)