Chain Versus Belt – System Comparison of Future Timing Drives

The challenge for the development of future gasoline and diesel engine families is further increase of efficiency at increasing cost .pressure. Downsizing as a main engine trend for significant CO2 reduction with increased loads on the engine systems as well as engine lifetime requirements have a considerable impact on the layout and the quality requirements of timing drives. In the paper the main timing drive concepts, chain drive, dry belt and wet belt were analyzed and rated based on the functional influencing factors as target parameters to allow a scientifically based guidance for finding the most suitable timing drive concept.