Today’s modern turbo chargers used in gasoline and partly in diesel engines feature water channels to cool the bearings. Thus, the coolant flow through the turbo charger needs to be included into the total cooling system in a way that sufficient cooling performance is realized during operation, but also during soak condition.
The paper provides an overview about different concepts to cool the turbocharger bearings during operation and especially during soak conditions. It discusses advantages and disadvantages of the different concepts.
Finally, test results regarding specific design features to allow a cost effective solution are presented.