This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Lubricant Optimisation for Synchromesh Manual Transmission of Utility Vehicles
Technical Paper
2008-01-1710
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In general the mechanical design and function of synchronized manual transmissions has remained relatively constant over the years, with incremental improvements in components, gears, bearings, seals, synchronizers and fluids continuing to advance the quality of the overall product.
Marketplace demands generally drive improvements which are primarily aimed at durability and shift quality. Recently, however, advances in control and actuation technology have led to a new generation of automated manual transmissions. As a result, compatibility with electronic and valve components is becoming increasingly important. The synchronizers and fluid are two components that can affect the overall transmission performance experienced by the end user.
Historically, there has been a variety of synchronizer materials, primarily brass for smaller vehicles such as passenger cars and molybdenum-based products for larger commercial vehicles. Recently sinter compositions, carbon and also phenolic materials have been used although mostly in Japan. Each composition affords the designer different wear and durability properties(1). For example, although sinter is a copper-based alloy like brass the fluid does not always respond to each in the same way. Thus, there is a need to revise the fluid composition to obtain the optimum performance with the synchronizer material being used.
This paper studies the effect of fluids on the friction performance of the brass synchronizer materials used by one of India's leading original equipment manufacturers (OEM), Mahindra and Mahindra, during bench and vehicle testing. This paper also includes a range of key laboratory tests that provide a relative assessment of product performance.
Recommended Content
| Technical Paper | Development of Long Life Pulley-Supporting Bearing for Belt-CVT |
| Technical Paper | The Effect of Heavy Loads on Light Duty Vehicle Axle Operating Temperature |
| Technical Paper | Temperature Analyses in Mechanical Tranmissions |
Authors
Topic
Citation
Abraham, M., Ramaprabhu, R., and Evans, S., "Lubricant Optimisation for Synchromesh Manual Transmission of Utility Vehicles," SAE Technical Paper 2008-01-1710, 2008, https://doi.org/10.4271/2008-01-1710.Also In
References
- 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 2002-01-1697
- Lubrizol Internal Communication; Future Driveline Fluids for a Better World Gahagan M. P. Future Directions. Environnent II July 2002 Tokyo Japan
- Ueber den Nutzen von Mehrbereichsgetriebeoelen in Kraftfahrzeugen Peal S. N. Graham R. O'Connor B. M. Vortrag gehalten auf der Technischen Arbeitstagung Hohenheim 1995
- Lubricants for Optimized Manual Gearbox Performance Graham R. Gahagan M. P. Bigelow S. S. Cain R. W. 5 th CEC International Symposium May 1997 Gothenburg
- 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
- Synchronizer Blocker Ring with Organic Lining Lanzerath Gunter Helmut Patzer SAE Paper 860384
- Manual Transmission Fluid to Satisfy Global Market Needs - Part II Hong H. S. Huston M. E. Kurihara Y. Kojima N. Gahagan M. P. 5th Annual Fuels and Lubes Asia Conference January 26th - 29th 1999
- Lubricant Technology for Dual Clutch Transmissions Hurley S. Tipton C. D. Cook S. P. SAE Paper 2006-01-3245