Details
| Original language | English |
|---|---|
| Pages (from-to) | 451-458 |
| Number of pages | 8 |
| Journal | Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology |
| Volume | 222 |
| Issue number | 3 |
| Publication status | Published - May 2008 |
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.
Keywords
- Clutch, Cone, Disc, Distribution of lubricant, Fluorescence, Friction, Gear, Lubricant, Micro-contact, Pin, Pin-on-disc, Synchromesh, Synchronizer, Thickness of lubricant
ASJC Scopus subject areas
- Engineering(all)
- Mechanical Engineering
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, Vol. 222, No. 3, 05.2008, p. 451-458.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Microscopic investigations into lubricated friction pairs in synchronizers
AU - Poll, G.
AU - Neudörfer, S.
AU - Skubacz, T.
PY - 2008/5
Y1 - 2008/5
N2 - 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.
AB - 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.
KW - Clutch
KW - Cone
KW - Disc
KW - Distribution of lubricant
KW - Fluorescence
KW - Friction
KW - Gear
KW - Lubricant
KW - Micro-contact
KW - Pin
KW - Pin-on-disc
KW - Synchromesh
KW - Synchronizer
KW - Thickness of lubricant
UR - http://www.scopus.com/inward/record.url?scp=44949216602&partnerID=8YFLogxK
U2 - 10.15488/3020
DO - 10.15488/3020
M3 - Article
AN - SCOPUS:44949216602
VL - 222
SP - 451
EP - 458
JO - Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
JF - Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
SN - 1350-6501
IS - 3
ER -