Technologies for modern manual transmission performance

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Technologies for modern manual transmission performance

Gahagan, M.P. / Evans, S.D. / Yoshimura, T. / Hasegawa, H. / Vinci, J.N. / Grisso, B.A.

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. More recently advances in control and actuation technology have led to a new generation of automated manual transmissions where compatibility with electronic and valve components are becoming increasingly important. 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. 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, corrosion and seals.