Gangvekar, O. and Deshmane, S., "Grit Blasting on Synchronizer - To Resolve Early Crashing Complaint," SAE Technical Paper 2017-01-1769, 2017.
In today’s automobile market, most OEMs use manual transmission for cars. Gear Shifting is a crucial customer touch point. Any issue or inconvenience caused while shifting gears can result into customer dissatisfaction and will affect the brand image. Synchronizer is a vital subsystem for precise gear shifting mechanism. Based on vehicle application selection of synchronizer for given inertia and speed difference is a key factor which decides overall shift quality of gearbox.For more demanding driver abuse conditions like skip shifting, conventional brass synchronizers have proved inadequate for required speed difference and gear inertia, which eventually results into synchronizer crashing and affects driving performance. To increase synchronizer performance of multi-cone compact brass synchronizer, a ‘Grit blasting process’ has been added. These components tested with an accelerated test plan successfully.This paper focuses on synchronizer crashing and its capacity increase by enhancing synchronizer coefficient of friction with the help of addition of grit blasting process. Accelerated testing method and grit blasting process results are found beneficial for future manual synchronizer transmissions.