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For manual transmissions, including the automated types, reduced shifting effort and easy of gear set engagements in a short period of time without rattles and shakes are major requirements for the shift quality evaluations. Performance of the synchronizer mechanisms depends highly on the design, material and arrangement of the transmission synchronization components; thus, the synchronization process is a mechanical and tribological process which is influenced by numerous design parameters of the synchronizers, constraints and properties of the lubricated contacts. In this study, a detailed multi-body-dynamics model for a HCV (Heavy Commercial Vehicle) transmission gearset is presented; various synchronization simulations are performed and the results are compared with the objective shift quality measurements. The developed model yields total synchronization and engagement time based on the applied gear shifting effort.

This study mainly focuses on oil consumption behavior of laser textured cylinder bores. The results of an experimental study performed on a six cylinder, 9.0 L capacity diesel engine is presented. The engine has Compacted Graphite Iron (CGI) cylinder block, and parent bore power cylinder design. Both an instantaneous oil consumption measurement method, sulfur-tracing, and a conventional oil consumption measurement method, “drain and weigh”, are used in determining the effects of different laser texture parameters at different running conditions. Oil consumption measurement results with the conventional plateau honed surface in comparison with the laser honed surface are also discussed.