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Timing Drive Development for Combustion Engines
Published May 21, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Meeting
To match the requirements for new combustion engines regarding emissions, fuel consumption and engine power, downsizing has been the main strategy over the last years. For the mechanics of the engine components this means either higher loads or smaller dimensions or often even both of them simultaneously. Higher cylinder peak pressures in combination with lightweight designs result in increasing speed irregularity of the crankshaft. At the same time valve trains are optimized to their dynamic limits leading to increased dynamic driving torques of the camshafts. The timing drive may not give additional constraints, but must stand the higher excitations from both sides. The solution, to fulfill these requirements is simulation upfront. The dynamic behavior of the timing mechanism needs to be known and pre-optimized in the pre-prototype stage of the engines development process.