This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Technologies for Modern Manual Transmission Performance
Technical Paper
2003-01-2005
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
While the general mechanical design and function of synchronized manual transmissions has remained fairly constant over the years, incremental improvements of all components - gears, bearings, seals, synchronizers, and fluids - continue to advance the quality of the product. The improvements are generally driven by marketplace demands aimed at durability and shift quality. The synchronizer and fluid are two design components that can affect the overall performance of the transmission as observed by the end user.
In recent years there has been a variety of synchronizer materials from brass and molybdenum based products to include Sinter compositions as well as phenolic materials-particularly in Japan. Each composition affords the designer different wear and durability properties. For example, although the Sinter is a Cu based alloy like the brass; fluid response is not necessarily the same. Thus, there is a need for revision of the fluid composition to obtain the optimum effect from the synchronizer material. This paper examines the effect of fluids on the friction and wear performance of synchronizer materials in carefully controlled laboratory tests. In addition, the correct test methodology allows one to develop information about the shift quality of the fluid-synchronizer material combination. To achieve maximum benefit from the lubricant-gearbox system it is essential that the rheological and chemical properties of the fluid are in balance with the operating environment, hence the inclusion of sections on oxidation and seals.
Recommended Content
Technical Paper | Anti-Shudder Mechanism of ATF Additives at Slip-Controlled Lock-Up Clutch |
Technical Paper | GYLON Friction Material for Transmission Synchronizers |
Technical Paper | Surface Durability of Dry Coaxial Splines |
Authors
Topic
Citation
Gahagan, M., Yoshimura, T., and Vinci, J., "Technologies for Modern Manual Transmission Performance," SAE Technical Paper 2003-01-2005, 2003, https://doi.org/10.4271/2003-01-2005.Also In
References
- Examining the Benefits of Multigrade Gear Lubricants Peal S N Graham R O'Connor B M Technischen Arbeitstagung Hohenheim 1995
- Future Driveline Fluids for a Better World Gahagan M P Future Directions. Environnent II July 2002 Tokyo Japan
- Influence Of Additive Chemistry On Manual Transmission Synchronizer Performance O'Connor B.M Van Mullekom J.H Gahagan M.P Rank R. Jahn W. SAE paper O2SFL-164
- Gear Lubricants Evaluation Of High Temperature Performance And Effect On Radical Lip Seal Failures Graham R. Grill R.A Schwind J.J V. Tribology conference 27th-29th November 1991 Budapest
- Lubricants For Optimised Manual Gearbox Performance Graham R. Gahagan M.P Bigelow S.S Cain R.W 5 th CEC International Symposium May 1997 Gothenburg
- Synchronizer Blocker Ring with Organic Lining Lanzerath Gunter Patzer Helmut SAE Paper 860384